UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSRS CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-08349 Name of Fund: BlackRock MuniHoldings Florida Insured Fund Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Robert C. Doll, Jr., Chief Executive Officer, BlackRock MuniHoldings Florida Insured Fund, 800 Scudders Mill Road, Plainsboro, NJ 08536. Mailing address: P.O. Box 9011, Princeton, NJ 08543-9011 Registrant's telephone number, including area code: (609) 282-2800 Date of fiscal year end: 08/31/07 Date of reporting period: 09/01/06 - 02/28/07 Item 1 - Report to Stockholders ALTERNATIVES BLACKROCK SOLUTIONS EQUITIES FIXED INCOME LIQUIDITY REAL ESTATE Semi-Annual Reports BLACKROCK (Unaudited) FEBRUARY 28, 2007 BlackRock MuniHoldings Florida Insured Fund BlackRock MuniHoldings New York Insured Fund, Inc. NOT FDIC INSURED MAY LOSE VALUE NO BANK GUARANTEE BlackRock MuniHoldings Florida Insured Fund BlackRock MuniHoldings New York Insured Fund, Inc. Quality Profiles as of February 28, 2007 BlackRock MuniHoldings Florida Insured Fund Percent of Total By S&P/Moody's Rating Investments -------------------------------------------------------------------------------- AAA/Aaa............................................................ 93.2% AA/Aa.............................................................. 0.5 A/A................................................................ 4.3 BBB/Baa............................................................ 0.7 Other*............................................................. 1.3 -------------------------------------------------------------------------------- * Includes portfolio holdings in short-term investments. BlackRock MuniHoldings New York Insured Fund, Inc. Percent of Total By S&P/Moody's Rating Investments -------------------------------------------------------------------------------- AAA/Aaa............................................................ 91.9% AA/Aa.............................................................. 5.7 A/A................................................................ 1.7 BBB/Baa............................................................ 0.2 Other*............................................................. 0.5 -------------------------------------------------------------------------------- * Includes portfolio holdings in short-term investments and variable rate demand notes. Announcement of Annual Stockholders Meeting The Funds have determined that their annual stockholders meetings originally scheduled to be held in April 2007 will be postponed and will be held in September 2007. Proposals of stockholders intended to be presented at the meeting must be received by the Fund by May 15, 2007 for inclusion in each Fund's proxy statement and form of proxy for that meeting. The persons named as proxies in the proxy materials for each Fund's 2007 annual meeting of stockholders may exercise discretionary authority with respect to any stockholder proposal presented at such meeting if written notice of such proposal has not been received by the Funds by July 1, 2007. Written proposals and notices should be sent to the Secretary of the Fund, 800 Scudders Mill Road, Plainsboro, New Jersey 08536. Availability of Quarterly Schedules of Investments The Funds file their complete schedules of portfolio holdings with the Securities and Exchange Commission ("SEC") for the first and third quarters of each fiscal year on Form N-Q. The Funds' Forms N-Q are available on the SEC's Web site at http://www.sec.gov. The Funds' Forms N-Q may also be reviewed and copied at the SEC's Public Reference Room in Washington, DC. Information on the operation of the Public Reference Room may be obtained by calling 1-800-SEC-0330. Electronic Delivery Electronic copies of most financial reports and prospectuses are available on the Funds' Web site. Shareholders can sign up for e-mail notifications of quarterly statements, annual and semi-annual reports and prospectuses by enrolling in the Funds' electronic delivery program. To enroll: Shareholders Who Hold Accounts with Investment Advisers, Banks or Brokerages: Please contact your financial advisor. Please note that not all investment advisers, banks or brokerages may offer this service. 2 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 A Letter to Shareholders Dear Shareholder The new year began on a positive note for most financial markets, continuing the momentum from the fourth quarter of 2006. At the end of February, however, global equity markets registered their first significant decline since last summer. The market jitters were triggered by a significant setback in the Chinese market and were exacerbated by several concerns, notably a weakening economy, some disappointing corporate earnings announcements, geopolitical concerns related to Iran's nuclear program and increasing delinquencies in the subprime mortgage market. Despite the recent spate of volatility, underlying stock market fundamentals appear quite sound, supported by a generally good global economic backdrop, tame inflation, relatively low interest rates and attractive valuations. Not unlike the equity market, the bond market also has seen volatility recently as observers have attempted to interpret mixed economic signals. A bond market rally late last year reversed early in 2007 as the economic data strengthened. Prices improved (and yields fell) again in February as equities struggled. Notably, the Treasury curve remained inverted for much of 2006 and into 2007. The 30-year Treasury yield stood at 4.68% on February 28, 2007, while the one-month Treasury offered the highest yield on the curve at 5.24%. For its part, the Federal Reserve Board (the Fed) has left the target short-term interest rate on hold at 5.25% since first pausing on August 8, 2006. Although the central bankers continue to express concern about potential infla tionary pressures, they also have made reference to signs of economic weakness in their public statements. Most observers expect the Fed to keep interest rates on hold for now, but acknowledge that the combination of a mild economic slowdown and moderating inflation could prompt an interest rate cut later in 2007. Notwithstanding the volatility along the way, most major market indexes managed to post positive returns for the annual and semi-annual reporting periods ended February 28, 2007: Total Returns as of February 28, 2007 6-month 12-month ======================================================================================================= U.S. equities (Standard & Poor's 500 Index) + 8.93% +11.97% ------------------------------------------------------------------------------------------------------- Small cap U.S. equities (Russell 2000 Index) +10.76 + 9.87 ------------------------------------------------------------------------------------------------------- International equities (MSCI Europe, Australasia, Far East Index) +12.17 +21.07 ------------------------------------------------------------------------------------------------------- Fixed income (Lehman Brothers Aggregate Bond Index) + 3.66 + 5.54 ------------------------------------------------------------------------------------------------------- Tax-exempt fixed income (Lehman Brothers Municipal Bond Index) + 2.89 + 4.96 ------------------------------------------------------------------------------------------------------- High yield bonds (Credit Suisse High Yield Index) + 8.62 +12.36 ------------------------------------------------------------------------------------------------------- If the recent market movements are any guide, 2007 could be a year of enhanced market volatility. As you navigate the uncertainties of the financial markets, we encourage you to review your investment goals with your financial professional and to make portfolio changes, as needed. We thank you for trusting BlackRock with your investment assets, and we look forward to continuing to serve you in the months and years ahead. Sincerely, /s/ Robert C. Doll, Jr. Robert C. Doll, Jr. Fund President and Trustee/Director SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 3 A Discussion With Your Funds' Portfolio Managers Portfolio activity was centered on maintaining a stable net asset value and competitive yield amid the prevailing low interest rate environment and limited new investment opportunities. Describe the recent market environment relative to municipal bonds. Long-term bond yields moved slightly lower during the six-month period, as their prices correspondingly increased. The municipal bond market's strong technical position allowed long-term tax-exempt bond yields to decline more than taxable yields. Bond prices began to improve early in the period as economic growth softened and the Federal Reserve Board (the Fed) opted to refrain from raising its target interest rate after 17 consecutive increases since mid-2004. Bond prices found additional support from moderating oil prices, and by the end of November, 30-year U.S. Treasury bond yields had declined 32 basis points (.32%) to 4.56%. In December 2006 and January 2007, however, economic releases were generally stronger than expected. The more positive economic environment, coupled with year-end profit-taking, helped push bond yields higher (and prices lower). By the end of January, long-term U.S. Treasury bond yields had risen to 4.93% before falling again in February as softer economic news, particularly relating to employment and housing, allowed bond prices to rally once again. At the end of February 2007, 30-year U.S. Treasury bond yields stood at 4.68%, a decline of 20 basis points over the past six months. Ten-year U.S. Treasury note yields declined 18 basis points during the period to 4.56%. Longer-maturity tax-exempt issues outperformed comparable U.S. Treasury issues as investor demand outstripped a resurgent new-issue calendar. As reported by Municipal Market Data, yields on AAA-rated municipal issues maturing in 30 years declined 28 basis points to 3.97%, while yields on 10-year, AAA-rated issues declined eight basis points to 3.67%. Investor demand for municipal product remained strong throughout the six-month period. According to the Investment Company Institute, long-term municipal bond funds had net new cash flows of over $15 billion in 2006, a 200% increase compared to flows in 2005. This positive trend continued into 2007, with net cash flows in January exceeding $2.8 billion. Weekly fund flows, as reported by AMG Data, also have supported tax-exempt bond prices. Weekly average cash flows into long-term tax-exempt funds averaged more than $420 million over the past six months and more than $487 million in February. These flows represent a considerable improvement from weekly levels of $230 million - $250 million in the middle of 2006. New issuance in the municipal market has surged in recent months as municipalities have rushed to take advantage of low market yields and solid investor demand. During the six-month period, more than $206 billion in new long-term tax-exempt bonds was issued, an increase of 19.5% versus the same period a year ago. During the last three months, more than $115 billion in new long-term municipal bonds was underwritten, an increase of over 50% compared to the same period a year earlier. The recent increase in issuance has made the municipal market's outperformance even more impressive. In the past three months, we saw more than 10 underwritings that were greater than $750 million in size. Investor demand has been so strong that these issues were well oversubscribed and saw their initial offering yields reduced by as much as 10 basis points. Looking ahead, the tax-exempt bond market's technical position is likely to remain supportive, leading to continued outperformance relative to taxable issues. We believe recent stock market volatility and a benign inflationary environment should foster continued retail demand for municipal product in the coming months. 4 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 BlackRock MuniHoldings Florida Insured Fund Describe conditions in the State of Florida. Florida maintains credit ratings of Aa1, AAA and AA+ from Moody's, Standard & Poor's and Fitch, respectively. The state's consistently strong financial performance has been the result of a robust service-oriented economy, prudent budget decisions and a moderate debt profile. Florida's budget for fiscal year 2007 grew 7% to $74 billion and reflects continued spending constraints, conservative revenue projections and additional deposits to the state's reserve funds. Florida has adhered to strict budget guidelines in recent history and we expect that trend to continue, as many of the state's budget practices have been made into law, including the Constitutional limit on the spending of non-recurring revenues, which was adopted by voters in November 2006. Solid economic growth has allowed the state to build revenue reserves to an estimated $8 billion and to offer its residents some tax relief in the form of tax credits, tax-free shopping days and the repeal of the intangible tax. Overall sales tax growth, which has averaged over 8% per year in recent history, should be sufficient to cover any revenue losses associated with the repeal of the intangible tax, though no new revenue streams have been created. Spending at the state level remains dominated by education, with over 50% of the budget dedicated to primary and secondary education needs. The state also faces significant additional spending requirements as a result of the recent Class Size Initiative and an overall desire to increase the quality of public education in Florida. In addition to education, we expect that population growth will increase demand on the government to provide more monies for transportation, public safety, health services and emergency relief. Overall, Florida's economy continues to outperform on both a national and regional basis. Job creation has surpassed the national average, leading to low unemployment and rising personal incomes. The most recent data reflects an unemployment rate of 3.2%, compared to a national average of 4.4%. These trends, coupled with a relatively low cost of living, have encouraged migration into Florida and led to a more diversified demographic base. Although the demands of a growing population will put pressure on the state's finances, we continue to believe that Florida is well-positioned given its financial flexibility and record of proactive management. How did the Fund perform during the period? For the six-month period ended February 28, 2007, the Common Shares of BlackRock MuniHoldings Florida Insured Fund had net annualized yields of 4.94% and 5.29%, based on a period-end per share net asset value of $14.77 and a per share market price of $13.81, respectively, and $.362 per share income dividends. Over the same period, the total investment return on the Fund's Common Shares was +2.77%, based on a change in per share net asset value from $14.75 to $14.77, and assuming reinvestment of all distributions. The Fund's total return, based on net asset value, lagged the +3.11% average return of the Lipper Florida Municipal Debt Funds category for the six-month period. (Funds in this Lipper category limit their investment to those securities exempt from taxation in the State of Florida.) The Fund's underperformance is attributed largely to its exposure to bonds with intermediate maturities, which lagged as the yield curve flattened. We have exposure to these sectors through bonds that have been prerefunded -- thereby transforming several of our longer-dated issues into intermediate maturities. Although these bonds have underperformed on a total return basis, they were acquired in a higher interest rate environment and, as such, contribute meaningfully to the portfolio's yield. This has allowed the Fund to maintain an above-average distribution rate compared to its peers. While we have made efforts to reduce some of the Fund's concentration in prerefunded bonds, the cycle repeats itself as more bonds are prerefunded and the absolute low level of interest rates makes them difficult to replace. As we have noted in the past, the Fund is an insured product within a peer group that includes funds with the ability to invest in uninsured and non-investment grade credits. Although the credit spread tightening phenomenon that has benefited non-investment grade issues has slowed, these lower quality credits still amply outperformed the high-grade market during the reporting period, and our lack of exposure detracted from performance versus our more aggressive peers. SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 5 A Discussion With Your Funds' Portfolio Managers (continued) For a description of the Fund's total investment return based on a change in the per share market value of the Fund's Common Shares (as measured by the trading price of the Fund's shares on the New York Stock Exchange), and assuming reinvestment of distributions, please refer to the Financial Highlights section of this report. As a closed-end fund, the Fund's shares may trade in the secondary market at a premium or discount to the Fund's net asset value. As a result, total investment returns based on changes in the market value of the Fund's Common Shares can vary significantly from total investment returns based on changes in the Fund's net asset value. What changes were made to the portfolio during the period? We did not alter our mainline strategy -- that is, we continued our efforts to increase the level of income provided to shareholders while muting the Fund's net asset value volatility. Having said that, the low absolute level of interest rates has presented challenges in terms of yield enhancement, as most of the bonds in the portfolio are booked at higher yields than those currently available in the market. In general, we made purchases when the market backed up (that is, rates increased and prices fell) and were sellers in November, after the market had rallied sharply (that is, rates fell and prices increased). For the most part, we continued to target premium-coupon bonds in the 20-year to 30-year maturity range whenever they became available. We continued to find the most attractive risk/reward trade-off here, although the flatness of the yield curve has made for few compelling opportunities. New municipal issuance in the State of Florida increased roughly 20% over the six months compared to the same period a year ago. However, as has been the case for some time, few new issues met our desired investment characteristics. Much of the supply came in the form of refinancings, and the majority of the new issues came with coupons below 5%. Importantly, we remained fully invested throughout the period in an effort to augment yield. For the six-month period ended February 28, 2007, the Fund's Auction Market Preferred Shares had average yields as follows: Series A, 3.54%; Series B, 3.51%; Series C, 3.53%; Series D, 3.50%; and Series E, 3.53%. There was no material change in the Fundborrowing costs over the course of the period, as the Fed left the short-term interest rate target unchanged at 5.25%. Although flat by historical standards, the tax-exempt yield curve maintained a positive slope throughout the period (particularly compared to the U.S. Treasury curve), allowing us to borrow at a lower rate than where we invest. This continued to generate an income benefit to the holders of Common Shares from the leveraging of Preferred Shares. Of course, should the spread between short-term and long-term interest rates narrow, the benefits of leveraging will decline and, as a result, reduce the yield on the Fund's Common Shares. For a more complete explanation of the benefits and risks of leveraging, see page 9 of this report to shareholders. How would you characterize the Fund's position at the close of the period? We ended the period with a slightly defensive stance on interest rates, reflecting a shift we had made after the market rallied strongly in the fourth quarter of 2006. We expect to return to a neutral posture, given the flatness of the yield curve and the fact that the Fed has remained on hold since last increasing rates in June, instead relying on security selection as the key driver of performance. While we had expressed some interest in the 10-year to 20-year maturity range in our last report to shareholders, we generally have remained focused on longer-dated Florida issues, which we believe offer greater potential for yield enhancement. We intend to exercise patience as we continue to look for 20-year to 30-year bonds with coupons in the area of 5%. 6 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 BlackRock MuniHoldings New York Insured Fund, Inc. Describe conditions in the State of New York. The State of New York is rated Aa3, AA and AA- by Moody's, Standard & Poor's and Fitch, respectively, all with stable trends. New York State ranks fifth in both debt per capita and debt as a percent of personal income, according to Moody's. It also ranked fifth in per capita income in 2005 (latest), according to the U.S. Department of Commerce. New York's January 2007 unemployment rate was 4.3% versus the U.S. national rate of 4.6%. Fiscal year 2006 operations resulted in a $2 billion surplus and an ending $900 million "rainy day" reserve. The November 2006 financial plan update forecasts a $1.1 billion General Fund surplus in fiscal year 2007 due to higher-than-expected receipts and spending reductions. New York's Governor recently proposed a $120.6 billion budget for fiscal year 2008 that increases spending by 6.3%, the largest annual increase since 2000, and includes $2.8 billion in gap-closing measures, such as $1.2 billion in healthcare cuts. Key credit issues are cost pressures from Medicaid, pensions and school aid, as well as the sustainability of growing personal income tax receipts. How did the Fund perform during the period? For the six-month period ended February 28, 2007, the Common Stock of BlackRock MuniHoldings New York Insured Fund, Inc. had net annualized yields of 4.66% and 5.01%, based on a period-end per share net asset value of $15.13 and a per share market price of $14.08, respectively, and $0.350 per share income dividends. Over the same period, the total investment return on the Fund's Common Stock was +3.65%, based on a change in per share net asset value from $14.96 to $15.13, and assuming reinvestment of all distributions. The Fund's total return, based on net asset value, outpaced the +3.29% average return of the Lipper New York Insured Municipal Debt Funds category for the six-month period. (Funds in this Lipper category invest primarily in securities exempt from taxation in New York and insured as to timely payment.) An ongoing commitment to generating an above average level of distribution income for shareholders was the primary driver of the Fund's total return performance. Notably, the Fund maintained an above average yield compared to its Lipper peers. The Fund's appetite for incremental yield forced it to seek securities on the long end of the municipal yield curve, which was among the best-performing segments in both the municipal market and broader fixed income markets during the period. This strategy provided a dual benefit for the Fund, allowing it to pick up additional market yield while also reaping higher total returns thanks to a sharp rally in longer-dated municipal securities. Out-of-favor coupons (mainly discounted bonds) and housing bonds were among the portfolio's stronger performing assets. Detracting from the Fund's performance was the ongoing effect of a low-interest-rate environment, wherein issuers of higher coupon bonds pursue refinancing opportunities and call their outstanding bonds. This trend persisted during the semi-annual period, and as is characteristic of this scenario, detracted from overall performance by dampening the distribution income of the Fund. For a description of the Fund's total investment return based on a change in the per share market value of the Fund's Common Stock (as measured by the trading price of the Fund's shares on the New York Stock Exchange), and assuming reinvestment of distributions, please refer to the Financial Highlights section of this report. As a closed-end fund, the Fund's shares may trade in the secondary market at a premium or discount to the Fund's net asset value. As a result, total investment returns based on changes in the market value of the Fund's Common Stock can vary significantly from total investment returns based on changes in the Fund's net asset value. What changes were made to the portfolio during the period? Portfolio activity was centered on maintaining the Fund's relatively high distribution rate. We invested largely on the long end of the curve, where we found attractive opportunities to trade the portfolio and generate higher levels of income. Among our key purchases were the abovementioned lower-coupon and housing bonds, as well as zero-coupon bonds that included Puerto Rican zero-coupon bonds. Alternative minimum tax (AMT) issues also were a good source of incremental yield during the period. We continued to trim some of the portfolio's short-term investments, specifically shorter-dated prerefunded bonds and high-coupon, short-call bonds (primarily those with call dates within three years or less). SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 7 A Discussion With Your Funds' Portfolio Managers (concluded) New issuance in the New York municipal market was fairly stagnant, which continues to present a challenge in terms of diversifying the portfolio and making up for yield lost to calls of higher-coupon bonds. New issuance was down 9.7% over the six-month period, although the latter three months saw a significant rise (+70%), which was attributable to a handful of large deals. The two most noteworthy transactions in which we participated were a $2 billion bond offering by Hudson Yards Infrastructure (new development project) and a $227 million offering by Carousel Center in Syracuse (existing mall expansion project). The remaining new issues were primarily in credits where the Fund already has some exposure, including Long Island Power Authority, or offered little in the way of diversification. For the six months ended February 28, 2007, the Fund's Auction Market Preferred Stock had average yields as follows: Series A, 3.15%; Series B, 3.18%; Series C, 3.24%; Series D, 3.25%; and Series E, 3.20%. There was no material change in the Fund's borrowing costs over the course of the period, as the Fed left the short-term interest rate target unchanged at 5.25%. Although flat by historical standards, the tax-exempt yield curve maintained a positive slope throughout the period (particularly compared to the U.S. Treasury curve), allowing us to borrow at a lower rate than where we invest. This continued to generate an income benefit to the holders of Common Stock from the leveraging of Preferred Stock. However, should the spread between short-term and long-term interest rates narrow, the benefits of leveraging will decline and, as a result, reduce the yield on the Fund's Common Stock. For a more complete explanation of the benefits and risks of leveraging, see page 9 of this report to shareholders. How would you characterize the Fund's position at the close of the period? Given a quiet Fed and few new-issue prospects, we are focusing our efforts on identifying compelling relative value trading opportunities, while continuing to add higher-yielding securities as occasions arise. At the same time, we await the new-issue calendar to offer greater prospects for diversification, as well as income accrual. We continue to expect relative value trading and yield to be the key drivers of the Fund's future performance and, accordingly, will look to the long end of the municipal yield curve to supply the most suitable prospects. Robert D. Sneeden Vice President and Portfolio Manager BlackRock MuniHoldings Florida Insured Fund Timothy T. Browse, CFA Vice President and Portfolio Manager BlackRock MuniHoldings New York Insured Fund, Inc. March 19, 2007 8 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 The Benefits and Risks of Leveraging The Funds utilize leveraging to seek to enhance the yield and net asset value of their Common Shares or Common Stock. However, these objectives cannot be achieved in all interest rate environments. To leverage, the Funds issue Preferred Shares or Stock, which pay dividends at prevailing short-term interest rates, and invest the proceeds in long-term municipal bonds. The interest earned on these investments, net of dividends to Preferred Shares or Stock, is paid to Common Shareholders or Common Stock shareholders in the form of dividends, and the value of these portfolio holdings is reflected in the per share net asset value of the Fund's Common Shares or Stock. However, in order to benefit Common Shareholders or Common Stock shareholders, the yield curve must be positively sloped; that is, short-term interest rates must be lower than long-term interest rates. At the same time, a period of generally declining interest rates will benefit Common Shareholders or Common Stock shareholders. If either of these conditions change, then the risks of leveraging will begin to outweigh the benefits. To illustrate these concepts, assume a fund's Common Shares or Stock capitalization of $100 million and the issuance of Preferred Shares or Stock for an additional $50 million, creating a total value of $150 million available for investment in long-term municipal bonds. If prevailing short-term interest rates are approximately 3% and long-term interest rates are approximately 6%, the yield curve has a strongly positive slope. The fund pays dividends on the $50 million of Preferred Shares or Stock based on the lower short-term interest rates. At the same time, the fund's total portfolio of $150 million earns the income based on long-term interest rates. In this case, the dividends paid to Preferred Shareholders or Preferred Stock shareholders are significantly lower than the income earned on the fund's long-term investments, and therefore the Common Shareholders or Common Stock shareholders are the beneficiaries of the incremental yield. However, if short-term interest rates rise, narrowing the differential between short-term and long-term interest rates, the incremental yield pickup on the Common Shares or Stock will be reduced or eliminated completely. At the same time, the market value on the fund's Common Shares or Stock (that is, its price as listed on the New York Stock Exchange), may, as a result, decline. Furthermore, if long-term interest rates rise, the Common Shares' or Stock's net asset value will reflect the full decline in the price of the portfolio's investments, since the value of the fund's Preferred Shares or Stock does not fluctuate. In addition to the decline in net asset value, the market value of the fund's Common Shares or Stock may also decline. As of February 28, 2007, BlackRock MuniHoldings Florida Insured Fund and BlackRock MuniHoldings New York Insured Fund, Inc. had leverage amounts, due to Auction Market Preferred Shares or Stock of 39.46% and 40.14% of total net assets, respectively, before the deduction of Preferred Shares or Stock. As a part of their investment strategy, the Funds may invest in certain securities whose potential income return is inversely related to changes in a floating interest rate ("inverse floaters"). In general, income on inverse floaters will decrease when short-term interest rates increase and increase when short-term interest rates decrease. Investments in inverse floaters may be characterized as derivative securities and may subject the Funds to the risks of reduced or eliminated interest payments and losses of invested principal. In addition, inverse floaters have the effect of providing investment leverage and, as a result, the market value of such securities will generally be more volatile than that of fixed rate, tax-exempt securities. To the extent the Funds invest in inverse floaters, the market value of each Fund's portfolio and the net asset value of each Fund's shares may also be more volatile than if the Funds did not invest in these securities. SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 9 Schedule of Investments as of February 28, 2007 (Unaudited) BlackRock MuniHoldings Florida Insured Fund (in Thousands) Face Amount Municipal Bonds Value =============================================================================== District of Columbia -- 0.4% ------------------------------------------------------------------------------- $ 2,050 Metropolitan Washington Airports Authority, D.C., Airport System Revenue Bonds, AMT, Series A, 5.25% due 10/01/2032 (h) $ 2,160 =============================================================================== Florida -- 149.0% ------------------------------------------------------------------------------- 6,600 Alachua County, Florida, School Board, COP, 5.25% due 7/01/2029 (b) 7,107 ------------------------------------------------------------------------------- Bay County, Florida, Sales Tax Revenue Bonds (b): 3,490 5% due 9/01/2025 3,772 3,665 5% due 9/01/2026 3,956 ------------------------------------------------------------------------------- 4,190 Beacon Tradeport Community Development District, Florida, Special Assessment Revenue Refunding Bonds (Commercial Project), Series A, 5.625% due 5/01/2032 (k) 4,563 ------------------------------------------------------------------------------- 8,000 Broward County, Florida, Educational Facilities Authority Revenue Bonds (Nova Southeastern University), 5% due 4/01/2031 (n) 8,461 ------------------------------------------------------------------------------- Cape Coral, Florida, Special Obligation Revenue Bonds (a): 3,000 5% due 10/01/2030 3,212 4,190 5% due 10/01/2033 4,480 ------------------------------------------------------------------------------- 410 Clay County, Florida, HFA, S/F Mortgage Revenue Bonds, AMT, 6.55% due 3/01/2028 (d)(i) 418 ------------------------------------------------------------------------------- 1,320 Clay County, Florida, School Board, COP (Master Lease Program), 5.75% due 7/01/2010 (a)(j) 1,416 ------------------------------------------------------------------------------- 900 Collier County, Florida, IDA, IDR, Refunding (Southern States Utilities), AMT, 6.50% due 10/01/2025 911 ------------------------------------------------------------------------------- Dade County, Florida, Water and Sewer System Revenue Bonds (h): 20,575 5.25% due 10/01/2021 20,959 21,640 5.25% due 10/01/2026 22,014 ------------------------------------------------------------------------------- 2,000 Deltona, Florida, Transportation Capital Improvement Revenue Bonds, 5.125% due 10/01/2026 (a) 2,174 ------------------------------------------------------------------------------- Emerald Coast, Florida, Utilities Authority, System Revenue Bonds (h): 1,130 5.25% due 1/01/2026 1,239 1,560 5.25% due 1/01/2036 1,699 ------------------------------------------------------------------------------- 1,515 Emerald Coast, Florida, Utilities Authority, System Revenue Refunding Bonds, 5% due 1/01/2023 (h) 1,645 ------------------------------------------------------------------------------- Escambia County, Florida, HFA, S/F Mortgage Revenue Refunding Bonds (Multi-County Program), AMT, Series A (a)(i): 105 6.30% due 10/01/2020 106 390 6.375% due 10/01/2026 394 ------------------------------------------------------------------------------- 1,835 Flagler County, Florida, Capital Improvement Revenue Bonds, 5% due 10/01/2035 (a) 1,951 ------------------------------------------------------------------------------- Florida HFA, Homeowner Mortgage Revenue Refunding Bonds, AMT, Series 2 (a): 1,455 5.75% due 7/01/2014 1,463 11,025 5.90% due 7/01/2029 11,192 ------------------------------------------------------------------------------- 12,000 Florida Higher Educational Facilities Financing Authority Revenue Bonds (Flagler College, Inc. Project), 5.25% due 11/01/2036 (p) 13,082 ------------------------------------------------------------------------------- 5,975 Florida Housing Finance Corporation, Homeowner Mortgage Revenue Bonds, AMT, Series 11, 5.95% due 1/01/2032 (c) 6,185 ------------------------------------------------------------------------------- 790 Florida Housing Finance Corporation, Homeowner Mortgage Revenue Refunding Bonds, AMT, Series 4, 6.25% due 7/01/2022 (c) 807 ------------------------------------------------------------------------------- 2,055 Florida Housing Finance Corporation, Housing Revenue Bonds (Waverly Apartments), AMT, Series C-1, 6.30% due 7/01/2030 (c) 2,196 ------------------------------------------------------------------------------- Florida Municipal Loan Council Revenue Bonds, Series B (a): 1,285 5.375% due 11/01/2025 1,361 4,150 5.375% due 11/01/2030 4,389 ------------------------------------------------------------------------------- 3,750 Florida State Board of Education, Capital Outlay, GO, Public Education, Refunding, Series D, 5.75% due 6/01/2022 (c) 4,025 ------------------------------------------------------------------------------- 1,000 Florida State Board of Education, Capital Outlay, GO, Public Education, Series C, 5.75% due 6/01/2010 (h)(j) 1,073 ------------------------------------------------------------------------------- 2,200 Florida State Board of Regents, Housing Revenue Bonds (University of Central Florida), 5.25% due 10/01/2026 (h) 2,317 ------------------------------------------------------------------------------- 7,165 Florida State Board of Regents, University Systems Improvement Revenue Bonds, 5.25% due 7/01/2007 (a)(j) 7,275 ------------------------------------------------------------------------------- 3,505 Florida State Department of Management Services, Division Facilities Management Revenue Bonds (Florida Facilities Pool), Series A, 6% due 9/01/2010 (b)(j) 3,806 ------------------------------------------------------------------------------- Florida State Governmental Utility Authority, Utility Revenue Bonds (b): 2,350 (Citrus Utility System), 5.125% due 10/01/2033 2,495 2,900 (Lehigh Utility System), 5.125% due 10/01/2033 3,079 ------------------------------------------------------------------------------- Portfolio Abbreviations To simplify the listings of portfolio holdings in the Schedules of Investments, we have abbreviated the names of many of the securities according to the list at right. AMT Alternative Minimum Tax (subject to) COP Certificates of Participation DRIVERS Derivative Inverse Tax-Exempt Receipts GO General Obligation Bonds HFA Housing Finance Agency IDA Industrial Development Authority IDR Industrial Development Revenue Bonds M/F Multi-Family PCR Pollution Control Revenue Bonds PILOT Payment in Lieu of Taxes S/F Single-Family VRDN Variable Rate Demand Notes 10 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Schedule of Investments (continued) BlackRock MuniHoldings Florida Insured Fund (in Thousands) Face Amount Municipal Bonds Value =============================================================================== Florida (continued) ------------------------------------------------------------------------------- $ 8,805 Fort Myers, Florida, Utility System Revenue Refunding Bonds, 5% due 10/01/2031 (a) $ 9,450 ------------------------------------------------------------------------------- 16,000 Hernando County, Florida, School Board, COP, 5% due 7/01/2030 (a) 17,046 ------------------------------------------------------------------------------- Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System): 7,135 Series A, 6% due 11/15/2011 (j) 7,889 7,285 Series C, 5.25% due 11/15/2036 7,782 ------------------------------------------------------------------------------- 3,425 Hillsborough County, Florida, Port District Revenue Bonds (Tampa Port Authority Project), AMT, 5% due 6/01/2036 (a) 3,606 ------------------------------------------------------------------------------- Hillsborough County, Florida, School Board, COP (a)(j): 6,600 5.375% due 7/01/2009 6,856 33,400 6% due 7/01/2009 35,467 ------------------------------------------------------------------------------- 1,300 Indian River County, Florida, Water and Sewer Revenue Refunding Bonds, Series A, 5.25% due 9/01/2018 (h) 1,353 ------------------------------------------------------------------------------- 1,800 Jacksonville, Florida, Economic Development Commission, Health Care Facilities Revenue Bonds (Mayo Clinic -- Jacksonville), Series A, 5.50% due 11/15/2036 (a) 1,935 ------------------------------------------------------------------------------- 7,305 Jacksonville, Florida, Guaranteed Entitlement Revenue Refunding and Improvement Bonds, 5.25% due 10/01/2032 (h) 7,777 ------------------------------------------------------------------------------- 10,000 Jacksonville, Florida, Health Facilities Authority, Hospital Revenue Bonds (Baptist Medical Center Project), Series A, 5% due 8/15/2037 10,405 ------------------------------------------------------------------------------- 1,870 Jacksonville, Florida, Port Authority, Seaport Revenue Bonds, AMT, 5.625% due 11/01/2026 (a) 1,974 ------------------------------------------------------------------------------- Jacksonville, Florida, Sales Tax Revenue Bonds: 2,000 5.50% due 10/01/2016 (b) 2,150 3,800 5.50% due 10/01/2018 (b) 4,076 11,400 5% due 10/01/2027 (a) 12,048 ------------------------------------------------------------------------------- 1,500 Jacksonville, Florida, Water and Sewer Revenue Bonds (United Water Florida Project), AMT, 6.35% due 8/01/2025 (b) 1,516 ------------------------------------------------------------------------------- 5,000 Lake County, Florida, School Board, COP, Series A, 5% due 6/01/2030 (b) 5,291 ------------------------------------------------------------------------------- 4,225 Lee County, Florida, Capital Revenue Bonds, 5.25% due 10/01/2023 (b) 4,552 ------------------------------------------------------------------------------- 85 Lee County, Florida, HFA, S/F Mortgage Revenue Bonds (Multi-County Program), AMT, Series A-1, 7.20% due 3/01/2033 (d)(g) 86 ------------------------------------------------------------------------------- 360 Lee County, Florida, HFA, S/F Mortgage Revenue Refunding Bonds, AMT, Series A-2, 6.30% due 3/01/2029 (d)(e)(g) 363 ------------------------------------------------------------------------------- 7,375 Lee County, Florida, School Board, COP, Series A, 5% due 8/01/2025 (c) 7,919 ------------------------------------------------------------------------------- Leesburg, Florida, Capital Improvement Revenue Bonds (h): 1,605 5.25% due 10/01/2027 1,746 3,425 5.25% due 10/01/2034 3,703 ------------------------------------------------------------------------------- 435 Manatee County, Florida, HFA, S/F Mortgage Revenue Refunding Bonds, AMT, Sub-Series 1, 6.25% due 11/01/2028 (d) 436 ------------------------------------------------------------------------------- 3,675 Marco Island, Florida, Utility System Revenue Bonds, 5% due 10/01/2033 (a) 3,873 ------------------------------------------------------------------------------- 5,990 Martin County, Florida, Utilities System Revenue Bonds, 5.125% due 10/01/2033 (b) 6,359 ------------------------------------------------------------------------------- Miami Beach, Florida, Stormwater Revenue Bonds (h): 1,630 5.75% due 9/01/2016 1,752 1,000 5.25% due 9/01/2020 1,057 4,400 5.25% due 9/01/2025 4,630 1,910 5.375% due 9/01/2030 2,016 ------------------------------------------------------------------------------- Miami Beach, Florida, Water and Sewer Revenue Bonds (b): 2,690 5.625% due 9/01/2018 2,880 10,600 5.75% due 9/01/2025 11,366 ------------------------------------------------------------------------------- Miami-Dade County, Florida, Aviation Revenue Bonds, AMT, Series A: 5,375 5% due 10/01/2033 (c) 5,574 7,450 5.125% due 10/01/2035 (c) 7,782 6,000 (Miami International Airport) 6% due 10/01/2024 (h) 6,464 10,000 (Miami International Airport) 6% due 10/01/2029 (h) 10,753 ------------------------------------------------------------------------------- Miami-Dade County, Florida, Educational Facilities Authority Revenue Bonds (University of Miami), Series A (b): 1,000 5.50% due 4/01/2019 1,060 19,425 6% due 4/01/2023 20,856 5,000 5.75% due 4/01/2029 5,326 ------------------------------------------------------------------------------- Miami-Dade County, Florida, Expressway Authority, Toll System Revenue Bonds, Series B (h): 8,995 5.25% due 7/01/2027 9,751 12,640 5% due 7/01/2033 13,354 ------------------------------------------------------------------------------- 12,250 Miami-Dade County, Florida, Expressway Authority, Toll System Revenue Refunding Bonds, 5.125% due 7/01/2025 (h) 12,942 ------------------------------------------------------------------------------- 6,705 Miami-Dade County, Florida, GO (Parks Program), 6% due 11/01/2024 (h) 7,142 ------------------------------------------------------------------------------- 2,185 Miami-Dade County, Florida, HFA, M/F Mortgage Revenue Bonds (Marbrisa Apartments Project), AMT, Series 2A, 6% due 8/01/2026 (c) 2,319 ------------------------------------------------------------------------------- Miami-Dade County, Florida, IDA, IDR (b): 5,100 (Airis Miami II LLC Project), AMT, 6% due 10/15/2019 5,408 3,280 (BAC Funding Corporation Project), Series A, 5.25% due 10/01/2020 3,500 ------------------------------------------------------------------------------- Miami-Dade County, Florida, Solid Waste System Revenue Bonds: 2,945 5.50% due 10/01/2015 (c) 3,163 3,105 5.50% due 10/01/2016 (c) 3,329 8,800 5.25% due 10/01/2030 (a) 9,599 ------------------------------------------------------------------------------- SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 11 Schedule of Investments (continued) BlackRock MuniHoldings Florida Insured Fund (in Thousands) Face Amount Municipal Bonds Value =============================================================================== Florida (continued) ------------------------------------------------------------------------------- Nassau County, Florida, Public Improvement Revenue Refunding Bonds (a): $ 1,035 5.75% due 5/01/2016 $ 1,115 1,095 5.75% due 5/01/2017 1,178 1,155 5.75% due 5/01/2018 1,243 1,225 5.75% due 5/01/2019 1,318 ------------------------------------------------------------------------------- 5,175 Nassau County, Florida, Water and Sewer System Revenue Bonds, 5.125% due 9/01/2033 (a) 5,490 ------------------------------------------------------------------------------- 795 Orange County, Florida, HFA, S/F Mortgage Revenue Bonds, AMT, 6.85% due 10/01/2027 (d)(g) 796 ------------------------------------------------------------------------------- Orange County, Florida, Health Facilities Authority, Hospital Revenue Bonds: 2,900 (Adventist Health System), 6.25% due 11/15/2012 (j) 3,257 9,220 (Orlando Regional Healthcare), 6% due 12/01/2012 (j) 10,245 5,000 (Orlando Regional Healthcare), Series A, 6.25% due 10/01/2018 (a) 6,035 ------------------------------------------------------------------------------- 1,300 Orange County, Florida, School Board COP, 5.50% due 8/01/2025 (b) 1,370 ------------------------------------------------------------------------------- 31,745 Orange County, Florida, Tourist Development, Tax Revenue Bonds, 5.75% due 10/01/2009 (b)(j) 33,394 ------------------------------------------------------------------------------- Orlando and Orange County, Florida, Expressway Authority Revenue Bonds, Series B (b): 3,250 5% due 7/01/2030 3,428 37,550 5% due 7/01/2035 39,611 ------------------------------------------------------------------------------- Osceola County, Florida, Infrastructure Sales Surplus Tax Revenue Bonds (b): 3,155 5.375% due 10/01/2018 3,406 7,680 5.25% due 10/01/2025 8,176 ------------------------------------------------------------------------------- Osceola County, Florida, Sales Tax Revenue Bonds (h): 2,065 5.625% due 6/01/2016 2,236 1,605 5.625% due 6/01/2017 1,734 1,075 5.625% due 6/01/2018 1,162 ------------------------------------------------------------------------------- 4,240 Osceola County, Florida, School Board, COP, Series A, 5.25% due 6/01/2027 (b) 4,532 ------------------------------------------------------------------------------- 5,560 Osceola County, Florida, Tourist Development Tax Revenue Bonds, Series A, 5.50% due 10/01/2027 (h) 5,980 ------------------------------------------------------------------------------- 9,935 Palm Beach County, Florida, GO (Liquid Acquisition Program), Series B, 5.75% due 8/01/2009 (a)(j) 10,511 ------------------------------------------------------------------------------- 6,115 Palm Beach County, Florida, School Board COP, Refunding, Series B, 5.375% due 8/01/2017 (b) 6,540 ------------------------------------------------------------------------------- Palm Beach County, Florida, School Board, COP, Series A: 5,070 6% due 8/01/2010 (h)(j) 5,488 13,205 6.25% due 8/01/2010 (h)(j) 14,399 13,500 5% due 8/01/2031 (c) 14,365 ------------------------------------------------------------------------------- 4,000 Palm Coast, Florida, Utility System Revenue Bonds, 5% due 10/01/2027 (a) 4,220 ------------------------------------------------------------------------------- 3,000 Panama City, Florida, Water and Sewer Revenue Bonds, Series B, 5.25% due 10/01/2022 (a) 3,253 ------------------------------------------------------------------------------- 2,070 Pembroke Pines, Florida, Public Improvement Revenue Bonds, Series A, 5% due 10/01/2034 (b) 2,192 ------------------------------------------------------------------------------- 4,940 Polk County, Florida, Public Facilities Revenue Bonds, 5% due 12/01/2033 (a) 5,264 ------------------------------------------------------------------------------- 9,885 Polk County, Florida, School Board COP, Master Lease, Series A, 5.50% due 1/01/2025 (c) 10,533 ------------------------------------------------------------------------------- Port St. Lucie, Florida, Utility Revenue Bonds (a): 1,280 5.25% due 9/01/2026 1,391 1,345 5.25% due 9/01/2027 1,462 ------------------------------------------------------------------------------- Port St. Lucie, Florida, Utility System Revenue Refunding Bonds, Series A (a): 5,000 5% due 9/01/2028 5,372 5,335 5% due 9/01/2029 5,727 ------------------------------------------------------------------------------- Saint Johns County, Florida, IDA, IDR, Refunding (Professional Golf Project) (a): 1,275 5.50% due 9/01/2015 1,379 1,345 5.50% due 9/01/2016 1,452 1,420 5.50% due 9/01/2017 1,526 1,500 5.50% due 9/01/2018 1,614 ------------------------------------------------------------------------------- Saint Johns County, Florida, Ponte Vedra Utility System Revenue Bonds (c): 2,945 5% due 10/01/2030 3,140 4,980 5% due 10/01/2035 5,295 ------------------------------------------------------------------------------- Saint Johns County, Florida, Sales Tax Revenue Bonds (b): 1,375 Series A, 5.25% due 10/01/2028 1,489 1,355 Series A, 5.25% due 10/01/2031 1,463 2,000 Series A, 5.25% due 10/01/2034 2,157 1,430 Series B, 5.25% due 10/01/2027 1,552 840 Series B, 5.25% due 10/01/2032 907 ------------------------------------------------------------------------------- 3,500 Saint Johns County, Florida, Transportation Improvement Revenue Bonds, 5.125% due 10/01/2032 (b) 3,716 ------------------------------------------------------------------------------- 4,055 Saint Lucie County, Florida, School Board, COP, 6.25% due 7/01/2010 (c)(j) 4,421 ------------------------------------------------------------------------------- Saint Lucie County, Florida, School Board COP, Refunding (c): 1,495 Series A, 5.50% due 7/01/2018 1,608 1,170 Series C, 5.50% due 7/01/2018 1,259 ------------------------------------------------------------------------------- Saint Lucie, Florida, West Services District, Utility Revenue Bonds (a): 1,720 5.25% due 10/01/2034 1,872 4,750 5% due 10/01/2038 5,046 ------------------------------------------------------------------------------- 3,250 Saint Lucie, Florida, West Services District, Utility Revenue Refunding Bonds, Senior Lien, 6% due 10/01/2022 (a) 3,549 ------------------------------------------------------------------------------- 6,615 South Florida Water Management District, COP, 5% due 10/01/2036 (b) 7,051 ------------------------------------------------------------------------------- 1,750 South Lake County, Florida, Hospital District Revenue Bonds (South Lake Hospital Inc.), 5.80% due 10/01/2034 1,826 ------------------------------------------------------------------------------- 2,250 Sunrise, Florida, Utility System Revenue Refunding Bonds, 5.20% due 10/01/2022 (b) 2,532 ------------------------------------------------------------------------------- 2,430 Sunrise Lakes, Florida, Phase 4 Recreation District, Refunding Bonds, GO, 5.25% due 8/01/2024 (b) 2,468 ------------------------------------------------------------------------------- Tallahassee, Florida, Lease Revenue Bonds (Florida State University Project), Series A (a): 2,800 5.25% due 8/01/2023 2,928 1,000 5.375% due 8/01/2026 1,055 12 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Schedule of Investments (concluded) BlackRock MuniHoldings Florida Insured Fund (in Thousands) Face Amount Municipal Bonds Value =============================================================================== Florida (concluded) ------------------------------------------------------------------------------- $30,335 Tampa Bay, Florida, Water Utility System Revenue Bonds, 6% due 10/01/2011 (h)(j) $ 33,309 ------------------------------------------------------------------------------- 3,835 Taylor County, Florida, Sales Tax Revenue Bonds, 6% due 10/01/2010 (h)(j) 4,137 ------------------------------------------------------------------------------- 8,935 University of Central Florida (UCF) Athletics Association Inc., COP, Series A, 5.25% due 10/01/2034 (h) 9,631 ------------------------------------------------------------------------------- Village Center Community Development District, Florida, Recreational Revenue Bonds, Series A (a): 10,775 5.375% due 11/01/2034 11,819 1,750 5.125% due 11/01/2036 1,880 ------------------------------------------------------------------------------- 3,000 Village Center Community Development District, Florida, Utility Revenue Bonds, 5.25% due 10/01/2023 (a) 3,242 ------------------------------------------------------------------------------- Volusia County, Florida, IDA, Student Housing Revenue Bonds (Stetson University Project), Series A (l): 2,075 5% due 6/01/2025 2,224 1,740 5% due 6/01/2035 1,849 =============================================================================== Georgia -- 1.8% ------------------------------------------------------------------------------- 9,700 Atlanta, Georgia, Airport Passenger Facility Charge and Subordinate Lien General Revenue Refunding Bonds, Series C, 5% due 1/01/2033 (c) 10,217 =============================================================================== Puerto Rico -- 1.5% ------------------------------------------------------------------------------- 2,500 Puerto Rico Commonwealth Highway and Transportation Authority, Transportation Revenue Refunding Bonds, Series M, 5% due 7/01/2037 2,659 ------------------------------------------------------------------------------- 2,600 Puerto Rico Commonwealth, Public Improvement, GO, Series A, 5.25% due 7/01/2026 2,834 ------------------------------------------------------------------------------- 2,725 Puerto Rico Industrial Tourist, Educational, Medical and Environmental Control Facilities Revenue Bonds (University Plaza Project), Series A, 5.625% due 7/01/2019 (a) 2,895 ------------------------------------------------------------------------------- Total Municipal Bonds (Cost -- $807,150) -- 152.7% 849,487 =============================================================================== Florida -- 16.7% ------------------------------------------------------------------------------- 28,210 Florida State Board of Education, Lottery Revenue Bonds, Series B, 6.25% due 7/01/2010 (h)(j) 30,755 ------------------------------------------------------------------------------- 28,650 Florida State Turnpike Authority, Turnpike Revenue Bonds (Department of Transportation), Series A, 6.25% due 7/01/2010 (h)(j) 31,235 ------------------------------------------------------------------------------- 19,925 Lee County, Florida, Airport Revenue Bonds, AMT, Series A, 6% due 10/01/2029 (c) 21,452 ------------------------------------------------------------------------------- 8,790 Santa Rosa County, Florida, School Board, COP, Revenue Refunding Bonds, Series 2, 5.25% due 2/01/2031 (h) 9,580 ------------------------------------------------------------------------------- Total Municipal Bonds Held in Trust (Cost -- $88,258) -- 16.7% 93,022 =============================================================================== =============================================================================== Shares Held Short-Term Securities =============================================================================== 12,872 CMA Florida Municipal Money Fund, 2.99% (m)(o) 12,872 ------------------------------------------------------------------------------- Total Short-Term Securities (Cost -- $12,872) -- 2.3% 12,872 =============================================================================== Total Investments (Cost -- $908,280*) -- 171.7% 955,381 Other Assets Less Liabilities -- 1.6% 9,036 Liability for Trust Certificates, Including Interest Expense Payable -- (8.0%) (44,739) Preferred Shares, at Redemption Value -- (65.3%) (363,383) --------- Net Assets Applicable to Common Shares -- 100.0% $ 556,295 ========= * The cost and unrealized appreciation (depreciation) of investments as of February 28, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost............................................. $867,567 ======== Gross unrealized appreciation.............................. $ 43,492 Gross unrealized depreciation.............................. (94) -------- Net unrealized appreciation................................ $ 43,398 ======== (a) MBIA Insured. (b) AMBAC Insured. (c) FSA Insured. (d) GNMA Collateralized. (e) FHLMC Collateralized. (f) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. (g) FNMA Collateralized. (h) FGIC Insured. (i) FHA Insured. (j) Prerefunded. (k) Radian Insured. (l) CIFG Insured. (m) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: -------------------------------------------------------------------------- Net Dividend Affiliate Activity Income -------------------------------------------------------------------------- CMA Florida Municipal Money Fund (2,798) $44 -------------------------------------------------------------------------- (n) Assured Guaranty Insured. (o) Represents the current yield as of February 28, 2007. (p) XL Capital Insured. See Notes to Financial Statements. SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 13 Schedule of Investments as of February 28, 2007 (Unaudited) BlackRock MuniHoldings New York Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value =============================================================================== New York -- 140.1% ------------------------------------------------------------------------------- Albany County, New York, Airport Authority, Airport Revenue Bonds, AMT (g): $ 1,500 5.375% due 12/15/2017 $ 1,545 1,500 5.50% due 12/15/2019 1,547 5,200 6% due 12/15/2023 (q) 5,386 ------------------------------------------------------------------------------- 3,375 Albany, New York, IDA, Civic Facility Revenue Bonds (The University Heights Association -- Albany Law School), Series A, 6.75% due 12/01/2029 (k) 3,632 ------------------------------------------------------------------------------- 1,000 Albany, New York, Municipal Water Finance Authority, Water and Sewer System Revenue Refunding Bonds, Series A, 6.375% due 12/01/2009 (e)(j) 1,082 ------------------------------------------------------------------------------- 2,000 Buffalo, New York, GO, Series D, 6% due 12/01/2009 (g)(j) 2,144 ------------------------------------------------------------------------------- 1,025 Erie County, New York, GO, Public Improvement, Series A, 5.75% due 10/01/2013 (e) 1,086 ------------------------------------------------------------------------------- Erie County, New York, IDA, School Facility Revenue Bonds (City of Buffalo Project) (g): 2,500 5.75% due 5/01/2019 2,740 5,150 5.75% due 5/01/2024 5,468 ------------------------------------------------------------------------------- 1,775 Greece, New York, Central School District, GO, Refunding, 4% due 6/15/2022 (g) 1,771 ------------------------------------------------------------------------------- 9,000 Hudson Yards Infrastructure Corporation, New York, Revenue Bonds, Series A, 4.50% due 2/15/2047 (i) 9,057 ------------------------------------------------------------------------------- Long Island Power Authority, New York, Electric System Revenue Bonds, Series A (a): 3,000 5% due 9/01/2029 3,187 5,950 5% due 9/01/2034 6,306 ------------------------------------------------------------------------------- 6,250 Long Island Power Authority, New York, Electric System Revenue Refunding Bonds, Series F, 4.25% due 5/01/2033 (i) 6,210 ------------------------------------------------------------------------------- 3,750 Madison County, New York, IDA, Civic Facility Revenue Bonds (Colgate University Project), Series A, 5% due 7/01/2035 (a) 4,008 ------------------------------------------------------------------------------- Metropolitan Transportation Authority, New York, Dedicated Tax Fund Revenue Bonds, Series A: 5,000 5% due 11/15/2011 (e)(j) 5,303 8,000 5% due 11/15/2035 (i) 8,611 ------------------------------------------------------------------------------- Metropolitan Transportation Authority, New York, Revenue Refunding Bonds: 14,515 Series A, 5% due 11/15/2030 (g) 15,249 2,500 Series A, 5.25% due 11/15/2031 (e) 2,671 29,000 Series A, 5.75% due 11/15/2032 (g) 31,785 1,500 Series B, 5% due 11/15/2028 (i) 1,591 ------------------------------------------------------------------------------- Metropolitan Transportation Authority, New York, Service Contract Revenue Refunding Bonds, Series A (e): 3,500 5% due 7/01/2021 3,708 2,000 5% due 7/01/2025 2,106 ------------------------------------------------------------------------------- Metropolitan Transportation Authority, New York, Transit Facilities Revenue Bonds (j): 2,535 Series C, 4.75% due 7/01/2012 (g) 2,675 1,000 Series C-1, 5.50% due 7/01/2008 (i) 1,030 ------------------------------------------------------------------------------- 2,500 Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series A, 5% due 11/15/2032 (e) 2,652 ------------------------------------------------------------------------------- 6,300 Metropolitan Transportation Authority, New York, Transportation Revenue Refunding Bonds, Series F, 5.25% due 11/15/2012 (i)(j) 6,819 ------------------------------------------------------------------------------- 4,210 Nassau Health Care Corporation, New York, Health System Revenue Bonds, 5.75% due 8/01/2009 (g)(j) 4,497 ------------------------------------------------------------------------------- 2,000 New York City, New York, City Health and Hospital Corporation, Health System Revenue Refunding Bonds, Series A, 5.25% due 2/15/2017 (i) 2,073 ------------------------------------------------------------------------------- New York City, New York, City Housing Development Corporation, M/F Housing Revenue Bonds, AMT: 1,250 Series C, 5% due 11/01/2026 1,297 2,000 Series C, 5.05% due 11/01/2036 2,106 1,000 Series H-1, 4.70% due 11/01/2040 1,003 2,340 Series H-2, 5.125% due 11/01/2034 2,415 ------------------------------------------------------------------------------- 885 New York City, New York, City IDA, Civic Facility Revenue Bonds (Anti-Defamation League Foundation), Series A, 5.50% due 6/01/2022 (i) 907 ------------------------------------------------------------------------------- 1,200 New York City, New York, City IDA, Civic Facility Revenue Refunding Bonds (Nightingale-Bamford School), 5.25% due 1/15/2017 (a) 1,290 ------------------------------------------------------------------------------- 11,805 New York City, New York, City IDA, IDR (Japan Airlines Company), AMT, 6% due 11/01/2015 (g) 11,843 ------------------------------------------------------------------------------- New York City, New York, City IDA, PILOT Revenue Bonds: 4,000 (Queens Baseball Stadium Project), 5% due 1/01/2031 (a) 4,312 10,890 (Queens Baseball Stadium Project), 5% due 1/01/2036 (a) 11,722 12,250 (Yankee Stadium Project), 5% due 3/01/2036 (i) 13,161 ------------------------------------------------------------------------------- 7,965 New York City, New York, City IDA, Parking Facility Revenue Bonds (Royal Charter -- New York Presbyterian), 5.75% due 12/15/2029 (g) 8,769 ------------------------------------------------------------------------------- 1,500 New York City, New York, City IDA, Special Facility Revenue Refunding Bonds (Terminal One Group Association Project), AMT, 5.50% due 1/01/2024 1,641 ------------------------------------------------------------------------------- 6,720 New York City, New York, City Municipal Financing Authority, Water and Sewer Systems Revenue Bonds, 5% due 6/15/2036 (i) 7,210 ------------------------------------------------------------------------------- 500 New York City, New York, City Municipal Water Finance Authority, Water and Sewer System Crossover Revenue Refunding Bonds, Series F, 5% due 6/15/2029 (g) 519 ------------------------------------------------------------------------------- 14 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Schedule of Investments (continued) BlackRock MuniHoldings New York Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value =============================================================================== New York (continued) ------------------------------------------------------------------------------- New York City, New York, City Municipal Water Finance Authority, Water and Sewer System Revenue Bonds: $ 2,850 Series A, 5.75% due 6/15/2009 (e)(j) $ 3,011 8,500 Series B, 5.75% due 6/15/2007 (i)(j) 8,637 300 VRDN, Series C, 3.57% due 6/15/2022 (e)(l) 300 ------------------------------------------------------------------------------- New York City, New York, City Municipal Water Finance Authority, Water and Sewer System Revenue Refunding Bonds: 1,250 Series A, 5.125% due 6/15/2034 (i) 1,319 5,500 Series A, 5% due 6/15/2035 (a) 5,806 1,750 Series C, 5% due 6/15/2035 (i) 1,855 ------------------------------------------------------------------------------- New York City, New York, City Transitional Finance Authority, Future Tax Secured Revenue Bonds: 1,145 Series B, 5.50% due 2/01/2012 (i) 1,229 805 Series B, 5.50% due 2/01/2013 (i) 864 6,405 Series B, 6.25% due 11/15/2018 (e) 6,977 1,180 Series C, 5.50% due 5/01/2009 (j) 1,238 16,200 Series C, 5% due 2/01/2033 (e) 17,141 2,500 Series E, 5.25% due 2/01/2022 (i) 2,682 ------------------------------------------------------------------------------- New York City, New York, City Transitional Finance Authority, Revenue Refunding Bonds: 1,000 Series A, 5% due 11/15/2026 (e) 1,053 1,580 Series B, 5.75% due 8/01/2010 (i)(j) 1,703 2,920 Series B, 5.75% due 8/01/2013 (i) 3,133 3,750 Series D, 5.25% due 10/15/2023 4,041 1,850 Series I, 6.25% due 4/15/2007 (i)(j) 1,875 8,000 Series J, 5% due 5/15/2023 8,481 8,300 Series M, 5% due 4/01/2035 8,775 1,150 Sub-Series C-1, 5.25% due 8/15/2026 1,242 ------------------------------------------------------------------------------- New York City, New York, GO, Refunding, Series A: 880 6.375% due 5/15/2010 (e)(j) 962 3,700 6.25% due 5/15/2026 (g) 3,998 ------------------------------------------------------------------------------- New York City, New York, Sales Tax Asset Receivable Corporation Revenue Bonds (a): 1,250 DRIVERS, Series 1438Z, 6.232% due 10/15/2012 (a)(m) 1,466 15,175 Series A, 5% due 10/15/2032 (a) 16,174 ------------------------------------------------------------------------------- 3,950 New York City, New York, Trust for Cultural Resources, Revenue Refunding Bonds (American Museum of Natural History), Series A, 5% due 7/01/2036 (i) 4,199 ------------------------------------------------------------------------------- 3,000 New York Convention Center Development Corporation, New York, Revenue Bonds (Hotel Unit Fee Secured), 5% due 11/15/2030 (a) 3,207 ------------------------------------------------------------------------------- New York State Dormitory Authority, Hospital Revenue Refunding Bonds: 1,000 (New York Presbyterian Hospital), 5.50% due 8/01/2011 (a)(f) 1,070 2,000 (North General Hospital), 5.75% due 2/15/2017 (n) 2,206 ------------------------------------------------------------------------------- New York State Dormitory Authority, Lease Revenue Bonds: 1,535 (Municipal Health Facilities Improvement Program), Series 1, 5.50% due 1/15/2014 (g) 1,639 645 (Office Facilities Audit and Control), 5.50% due 4/01/2023 (i) 675 ------------------------------------------------------------------------------- 3,900 New York State Dormitory Authority, Non-State Supported Debt Revenue Bonds (New York Hospital Medical Center of Queens), 4.75% due 2/15/2037 (f) 3,971 ------------------------------------------------------------------------------- New York State Dormitory Authority Revenue Bonds: 1,340 (853 Schools Program), Issue 2, Series E, 5.75% due 7/01/2019 (a) 1,415 1,200 (Cooper Union of Advance Science), 6.25% due 7/01/2009 (i)(j) 1,281 2,058 (Gustavus Adolphus Child & Family Services, Inc.), Series B, 5.50% due 7/01/2018 (a) 2,162 6,750 (Interfaith Medical Center), Series D, 5.40% due 2/15/2028 (i) 6,947 1,585 (Long Island University), Series B, 5.50% due 9/01/2020 (k) 1,720 1,250 (Long Island University), Series B, 5.25% due 9/01/2028 (k) 1,332 1,180 (New York State Rehabilitation Association), Series A, 5.25% due 7/01/2019 (c) 1,272 1,000 (New York State Rehabilitation Association), Series A, 5.125% due 7/01/2023 (c) 1,060 5,345 (Pace University), 6% due 7/01/2010 (i)(j) 5,798 2,150 (Saint Barnabas Hospital), 5.45% due 8/01/2035 (a)(f) 2,186 1,240 (School Districts Financing Program), Series D, 5% due 10/01/2030 (i) 1,305 6,900 (School Districts Financing Program), Series E, 5.75% due 10/01/2030 (i) 7,550 1,405 (Upstate Community Colleges), Series A, 6% due 7/01/2010 (g)(j) 1,524 ------------------------------------------------------------------------------- New York State Dormitory Authority, Revenue Refunding Bonds: 3,700 (Bronx-Lebanon Hospital Center), Series E, 5.20% due 2/15/2008 (i)(j) 3,809 1,865 (City University System), Series 1, 5.25% due 7/01/2014 (e) 1,925 3,400 (Saint Charles Hospital and Rehabilitation Center), Series A, 5.625% due 7/01/2012 (i) 3,573 1,370 (School District Financing Program), Series I, 5.75% due 10/01/2018 (i) 1,511 4,450 Series B, 5.50% due 8/15/2017 (i) 4,545 ------------------------------------------------------------------------------- SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 15 Schedule of Investments (continued) BlackRock MuniHoldings New York Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value =============================================================================== New York (continued) ------------------------------------------------------------------------------- New York State Dormitory Authority, Supported Debt Revenue Bonds: $ 1,550 (Mental Health Facilities), Series B, 5.25% due 2/15/2014 (j) $ 1,700 285 (Mental Health Facilities), Series B, 5.25% due 2/15/2023 308 1,060 (Mental Health Facilities), Series D, 5.875% due 8/15/2010 (g)(j) 1,139 7,000 (State University Dormitory Facilities), Series A, 5% due 7/01/2031 (i) 7,524 ------------------------------------------------------------------------------- 1,000 New York State Dormitory Authority, Supported Debt Revenue Refunding Bonds (Department of Health), Series A, 5% due 7/01/2025 (c) 1,067 ------------------------------------------------------------------------------- 12,960 New York State Energy Research and Development Authority, Gas Facilities Revenue Refunding Bonds (Brooklyn Union Gas Company/Keyspan), AMT, Series A, 4.70% due 2/01/2024 (e) 13,380 ------------------------------------------------------------------------------- 6,000 New York State Energy Research and Development Authority, PCR, Refunding (Central Hudson Gas and Electric), Series A, 5.45% due 8/01/2027 (a) 6,287 ------------------------------------------------------------------------------- 6,000 New York State Environmental Facilities Corporation, Water Facilities Revenue Bonds (Long Island Water Corp. Project), AMT, Series A, 4.90% due 10/01/2034 (i) 6,168 ------------------------------------------------------------------------------- 4,400 New York State Environmental Facilities Corporation, Water Facilities Revenue Refunding Bonds (Spring Valley Water Company), Series B, 6.15% due 8/01/2024 (a) 4,410 ------------------------------------------------------------------------------- 3,250 New York State, HFA, M/F Housing Revenue Bonds (Saint Philips Housing), AMT, Series A, 4.65% due 11/15/2038 3,257 ------------------------------------------------------------------------------- 750 New York State Housing Finance Agency, State Personal Income Tax Revenue Bonds (Economic Development and Housing), Series A, 5% due 9/15/2023 (i) 799 ------------------------------------------------------------------------------- 6,800 New York State Medical Care Facilities Finance Agency, Revenue Bonds (Montefiore Medical Center), Series A, 5.75% due 2/15/2025 (a)(f) 6,808 ------------------------------------------------------------------------------- 1,745 New York State Mortgage Agency, Homeowner Mortgage Revenue Bonds, AMT, Series 130, 4.80% due 10/01/2037 1,769 ------------------------------------------------------------------------------- New York State Mortgage Agency, Homeowner Mortgage Revenue Refunding Bonds, AMT: 2,140 Series 67, 5.70% due 10/01/2017 (i) 2,185 1,500 Series 133, 4.95% due 10/01/2021 1,554 2,100 Series 83, 5.55% due 10/01/2027 (i) 2,161 ------------------------------------------------------------------------------- 1,170 New York State Mortgage Agency Revenue Refunding Bonds, AMT, Series 82, 5.65% due 4/01/2030 (i) 1,178 ------------------------------------------------------------------------------- 5,000 New York State Thruway Authority, General Revenue Bonds, Series F, 5% due 1/01/2030 (a) 5,327 ------------------------------------------------------------------------------- New York State Thruway Authority, General Revenue Refunding Bonds, Series G (g): 2,000 4.75% due 1/01/2029 2,087 9,250 4.75% due 1/01/2030 9,637 ------------------------------------------------------------------------------- 8,000 New York State Thruway Authority, Highway and Bridge Trust Fund Revenue Bonds, Series B-1, 5.75% due 4/01/2010 (e)(j) 8,578 ------------------------------------------------------------------------------- 8,700 New York State Thruway Authority, Second General Highway and Bridge Trust Fund Revenue Bonds, Series A, 5% due 4/01/2026 (a) 9,392 ------------------------------------------------------------------------------- New York State Urban Development Corporation, Personal Income Tax Revenue Bonds: 3,000 Series C-1, 5% due 3/15/2013 (i)(j) 3,223 2,000 (State Facilities), Series A-1, 5% due 3/15/2029 (e) 2,122 ------------------------------------------------------------------------------- 1,000 Niagara Falls, New York, City School District, COP, Refunding (High School Facility), 5% due 6/15/2028 (g) 1,063 ------------------------------------------------------------------------------- 1,700 Oneida County, New York, IDA, Civic Facilities Revenue Bonds (Mohawk Valley), Series A, 5.20% due 2/01/2013 (g) 1,753 ------------------------------------------------------------------------------- 1,800 Oneida-Herkimer, New York, Solid Waste Management Authority, Solid Waste Revenue Refunding Bonds, 5.50% due 4/01/2013 (g) 1,959 ------------------------------------------------------------------------------- 2,500 Port Authority of New York and New Jersey, Consolidated Revenue Bonds, AMT, 137th Series, 5.125% due 7/15/2030 (g) 2,665 ------------------------------------------------------------------------------- 12,000 Port Authority of New York and New Jersey, Revenue Refunding Bonds, AMT, 120th Series, 6% due 10/15/2032 (i) 12,282 ------------------------------------------------------------------------------- Port Authority of New York and New Jersey, Special Obligation Revenue Bonds (JFK International Air Terminal LLC), AMT, Series 6 (i): 3,000 6.25% due 12/01/2011 3,304 7,830 6.25% due 12/01/2015 9,115 7,000 5.90% due 12/01/2017 7,242 ------------------------------------------------------------------------------- 2,500 Rensselaer, New York, City School District, COP, 5% due 6/01/2036 (n) 2,676 ------------------------------------------------------------------------------- 1,250 Rochester, New York, Housing Authority, Mortgage Revenue Bonds (Andrews Terrace Apartments Project), AMT, 4.70% due 12/20/2038 (o) 1,256 ------------------------------------------------------------------------------- 2,340 Rome, New York, City School District, GO, 5.50% due 6/15/2009 (g) 2,460 ------------------------------------------------------------------------------- 5,000 Schenectady, New York, IDA, Civic Facility Revenue Bonds (Union College Project), Series A, 5.45% due 12/01/2009 (a)(j) 5,334 ------------------------------------------------------------------------------- 16 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Schedule of Investments (continued) BlackRock MuniHoldings New York Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value =============================================================================== New York (concluded) ------------------------------------------------------------------------------- $ 3,000 Schenectady, New York, IDA, Civic Facility Revenue Refunding Bonds (Union College Project), Series A, 5.625% due 7/01/2011 (a)(j) $ 3,295 ------------------------------------------------------------------------------- 1,000 Suffolk County, New York, IDA, Civic Facility Revenue Refunding Bonds (Dowling College), Series A, 5% due 6/01/2036 (d) 1,047 ------------------------------------------------------------------------------- 4,355 Suffolk County, New York, IDA, IDR (Keyspan-Port Jefferson), AMT, 5.25% due 6/01/2027 4,604 ------------------------------------------------------------------------------- Suffolk County, New York, IDA, Solid Waste Disposal Facility, Revenue Refunding Bonds (Ogden Martin System Huntington Project), AMT (a): 4,660 6% due 10/01/2010 5,005 5,000 6.15% due 10/01/2011 5,485 3,530 6.25% due 10/01/2012 3,946 ------------------------------------------------------------------------------- 1,300 Suffolk County, New York, Public Improvement, GO, Series B, 4.50% due 11/01/2024 (i) 1,344 ------------------------------------------------------------------------------- 14,000 Syracuse, New York, IDA, PILOT Revenue Bonds (Carousel Center Project), AMT, Series A, 5% due 1/01/2036 (n) 14,767 ------------------------------------------------------------------------------- Tobacco Settlement Financing Corporation of New York Revenue Bonds: 5,000 Series A-1, 5.25% due 6/01/2020 (a) 5,383 13,275 Series A-1, 5.25% due 6/01/2021 (a) 14,238 2,000 Series A-1, 5.25% due 6/01/2022 (a) 2,142 3,700 Series C-1, 5.50% due 6/01/2021 4,023 ------------------------------------------------------------------------------- 3,300 Triborough Bridge and Tunnel Authority, New York, General Purpose Revenue Refunding Bonds, VRDN, Series C, 3.60% due 1/01/2032 (a)(l) 3,300 ------------------------------------------------------------------------------- Triborough Bridge and Tunnel Authority, New York, Revenue Refunding Bonds (i): 12,000 5.25% due 11/15/2023 12,885 8,315 5% due 11/15/2032 8,757 2,095 Series A, 5% due 1/01/2012 (j) 2,224 1,500 Series B, 5% due 11/15/2032 1,580 ------------------------------------------------------------------------------- 850 Triborough Bridge and Tunnel Authority, New York, Special Obligation Revenue Refunding Bonds, VRDN, Series C, 3.60% due 1/01/2031 (g)(l) 850 ------------------------------------------------------------------------------- Triborough Bridge and Tunnel Authority, New York, Subordinate Revenue Bonds: 2,465 5% due 11/15/2028 (a) 2,615 6,000 Series A, 5.25% due 11/15/2030 (i) 6,474 ------------------------------------------------------------------------------- 7,000 Westchester County, New York, IDA, Civic Facility Revenue Bonds (Purchase College Foundation Housing Project), Series A, 5.75% due 12/01/2031 (a) 7,702 ------------------------------------------------------------------------------- 1,795 Yonkers, New York, GO, Series A, 5.75% due 10/01/2010 (e) 1,942 =============================================================================== Guam -- 1.1% ------------------------------------------------------------------------------- A.B. Won Guam International Airport Authority, General Revenue Refunding Bonds, AMT, Series C (i): 3,700 5.25% due 10/01/2021 3,861 1,050 5.25% due 10/01/2022 1,096 =============================================================================== Puerto Rico -- 12.8% ------------------------------------------------------------------------------- 4,800 Puerto Rico Commonwealth Highway and Transportation Authority, Transportation Revenue Bonds, 5.25% due 7/01/2017 (e) 5,183 ------------------------------------------------------------------------------- Puerto Rico Commonwealth Highway and Transportation Authority, Transportation Revenue Refunding Bonds: 10,000 Series D, 5.75% due 7/01/2012 (j) 11,031 4,700 Series N, 5.25% due 7/01/2039 (e) 5,654 ------------------------------------------------------------------------------- Puerto Rico Commonwealth Infrastructure Financing Authority, Special Tax and Capital Appreciation Revenue Bonds, Series A (b): 10,280 4.62% due 7/01/2031 (e) 3,656 5,500 4.66% due 7/01/2033 (e) 1,778 9,300 4.66% due 7/01/2034 (a) 2,868 2,200 4.67% due 7/01/2037 (a) 593 ------------------------------------------------------------------------------- 1,345 Puerto Rico Commonwealth, Public Improvement, GO, Refunding, Series B, 5.25% due 7/01/2032 1,461 ------------------------------------------------------------------------------- 500 Puerto Rico Commonwealth, Public Improvement, GO, Series A, 5.25% due 7/01/2030 544 ------------------------------------------------------------------------------- 3,570 Puerto Rico Convention Center District Authority, Hotel Occupancy Tax Revenue Bonds, Series A, 5% due 7/01/2031 (a) 3,852 ------------------------------------------------------------------------------- Puerto Rico Electric Power Authority, Power Revenue Bonds: 4,750 Series NN, 5.125% due 7/01/2029 5,014 4,850 Series RR, 5% due 7/01/2029 (c) 5,180 4,950 Series RR, 5% due 7/01/2030 (n) 5,276 7,110 Series RR, 5% due 7/01/2035 (e) 7,605 ------------------------------------------------------------------------------- Total Municipal Bonds (Cost -- $688,769) -- 154.0% 717,407 =============================================================================== SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 17 Schedule of Investments (concluded) BlackRock MuniHoldings New York Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Held in Trust (r) Value =============================================================================== New York -- 24.2% ------------------------------------------------------------------------------- $18,000 Metropolitan Transportation Authority, New York, Revenue Refunding Bonds, Series A, 5.75% due 11/15/2032 (g) $ 19,728 ------------------------------------------------------------------------------- 23,000 New York City, New York, City Municipal Water Finance Authority, Water and Sewer System Revenue Bonds, Series A, 5.75% due 6/15/2011 (i)(j) 24,885 ------------------------------------------------------------------------------- 9,500 New York City, New York, GO, Series C, 5.75% due 3/15/2027 (g) 10,430 ------------------------------------------------------------------------------- 7,000 New York City, New York, Sales Tax Asset Receivable Corporation Revenue Bonds, Series A, 5% due 10/15/2032 (a) 7,606 ------------------------------------------------------------------------------- 21,000 New York Convention Center Development Corporation, New York, Revenue Bonds (Hotel Unit Fee Secured), 5% due 11/15/2035 (a) 22,419 ------------------------------------------------------------------------------- 26,730 Port Authority of New York and New Jersey, Special Obligation Revenue Bonds (JFK International Air Terminal), AMT, Series 6, 5.75% due 12/01/2022 (i) 27,624 =============================================================================== Puerto Rico -- 0.6% ------------------------------------------------------------------------------- 2,500 Puerto Rico Commonwealth Highway and Transportation Authority, Transportation Revenue Bonds, Series B, 5.875% due 7/01/2035 (i) 2,702 ------------------------------------------------------------------------------- Total Municipal Bonds Held in Trust (Cost -- $112,362) -- 24.8% 115,394 =============================================================================== =============================================================================== Shares Held Short-Term Securities =============================================================================== 73 CMA New York Municipal Money Fund, 3.10% (h)(p) 73 ------------------------------------------------------------------------------- Total Short-Term Securities (Cost -- $73) -- 0.0% 73 =============================================================================== Total Investments (Cost -- $801,204*) -- 178.8% 832,874 Other Assets Less Liabilities -- 1.6% 7,519 Liability for Trust Certificates, Including Interest Expense Payable -- (13.2%) (61,504) Preferred Stock, at Redemption Value -- (67.2%) (313,092) ---------- Net Assets Applicable to Common Stock -- 100.0% $ 465,797 ========== * The cost and unrealized appreciation (depreciation) of investments as of February 28, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost............................................. $740,540 ======== Gross unrealized appreciation.............................. $ 31,455 Gross unrealized depreciation.............................. (138) -------- Net unrealized appreciation................................ $ 31,317 ======== (a) AMBAC Insured. (b) Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase. (c) CIFG Insured. (d) ACA Insured. (e) FGIC Insured. (f) FHA Insured. (g) FSA Insured. (h) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: -------------------------------------------------------------------------- Net Dividend Affiliate Activity Income -------------------------------------------------------------------------- CMA New York Municipal Money Fund (61) $39 -------------------------------------------------------------------------- (i) MBIA Insured. (j) Prerefunded. (k) Radian Insured. (l) Security may have a maturity of more than one year at time of issuance, but has variable rate and demand features that qualify it as a short-term security. The rate disclosed is that currently in effect. This rate changes periodically based upon prevailing market rates. (m) The rate disclosed is that currently in effect. This rate changes periodically and inversely based upon prevailing market rates. (n) XL Capital Insured. (o) GNMA Collateralized. (p) Represents the current yield as of February 28, 2007. (q) All or a portion of security held as collateral in connection with open financial futures contracts. (r) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. See Note 1(c) to Financial Statements for details of Municipal Bonds Held in Trust. o Financial futures contracts sold as of February 28, 2007 were as follows: -------------------------------------------------------------------------- Number of Expiration Face Unrealized Contracts Issue Date Value Appreciation -------------------------------------------------------------------------- 395 30-Year U.S. March Treasury Bonds 2007 $45,094 $459 -------------------------------------------------------------------------- See Notes to Financial Statements. 18 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Statements of Net Assets BlackRock BlackRock MuniHoldings MuniHoldings Florida New York Insured Insured As of February 28, 2007 (Unaudited) Fund Fund, Inc. =================================================================================================================================== Assets ----------------------------------------------------------------------------------------------------------------------------------- Investments in unaffiliated securities, at value*.................................... $ 942,508,437 $ 832,801,566 Investments in affiliated securities, at value**..................................... 12,872,231 72,633 Cash................................................................................. 15,415 68,378 Interest receivable.................................................................. 14,329,307 10,052,393 Receivable for securities sold....................................................... 342,559 6,672,275 Receivable for variable margin....................................................... -- 160,469 Prepaid expenses..................................................................... 7,605 7,294 ---------------------------------- Total assets......................................................................... 970,075,554 849,835,008 ---------------------------------- =================================================================================================================================== Liabilities ----------------------------------------------------------------------------------------------------------------------------------- Trust certificates................................................................... 44,416,493 61,017,240 Payable for securities purchased..................................................... 2,982,256 7,250,825 Interest expense payable............................................................. 322,922 486,514 Payable to investment adviser........................................................ 352,131 299,961 Payable for other affiliates......................................................... 7,350 6,190 Dividends payable to Common Shareholders/Common Stock Shareholders................... 2,184,724 1,755,323 Accrued expenses..................................................................... 131,389 129,807 ---------------------------------- Total liabilities.................................................................... 50,397,265 70,945,860 ---------------------------------- =================================================================================================================================== Preferred Shares/Stock ----------------------------------------------------------------------------------------------------------------------------------- Preferred Shares/Stock, at redemption value, par value $.10 per share of AMPS@ at $25,000 per share liquidation preference***........................................ 363,382,822 313,091,799 ---------------------------------- =================================================================================================================================== Net Assets Applicable to Common Shares/Stock ----------------------------------------------------------------------------------------------------------------------------------- Net assets applicable to Common Shares/Stock......................................... $ 556,295,467 $ 465,797,349 ================================== =================================================================================================================================== Analysis of Net Assets Applicable to Common Shares/Stock ----------------------------------------------------------------------------------------------------------------------------------- Undistributed investment income -- net............................................... $ 1,948,263 $ 1,786,515 Accumulated realized capital losses -- net........................................... (67,604,076) (46,259,864) Unrealized appreciation -- net....................................................... 47,100,576 32,128,829 ---------------------------------- Total accumulated losses -- net...................................................... (18,555,237) (12,344,520) ---------------------------------- Common Shares/Stock, par value $.10 per share+....................................... 3,766,766 3,079,514 Paid-in capital in excess of par..................................................... 571,083,938 475,062,355 ---------------------------------- Net Assets........................................................................... $ 556,295,467 $ 465,797,349 ================================== SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 19 Statements of Net Assets (concluded) BlackRock BlackRock MuniHoldings MuniHoldings Florida New York Insured Insured As of February 28, 2007 (Unaudited) Fund Fund, Inc. =================================================================================================================================== Net Assets Value ----------------------------------------------------------------------------------------------------------------------------------- Net assets value per share of Common Shares/Stock.................................... $ 14.77 $ 15.13 ================================== Market price......................................................................... $ 13.81 $ 14.08 ================================== * Identified cost for unaffiliated securities.................................... $ 895,407,861 $ 801,131,309 ================================== ** Identified cost for affiliated securities...................................... $ 12,872,231 $ 72,633 ================================== *** Preferred Shares/Stock authorized, issued and outstanding: Series A Shares/Stock...................................................... 2,095 1,900 ================================== Series B Shares/Stock...................................................... 3,495 1,900 ================================== Series C Shares/Stock...................................................... 3,440 3,040 ================================== Series D Shares/Stock...................................................... 2,160 3,680 ================================== Series E Shares/Stock...................................................... 3,340 2,000 ================================== + Common Shares/Stock issued and outstanding..................................... 37,667,658 30,795,138 ================================== @ Auction Market Preferred Shares/Stock. See Notes to Financial Statements. 20 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Statements of Operations BlackRock BlackRock MuniHoldings MuniHoldings Florida New York Insured Insured For the Six Months Ended February 28, 2007 (Unaudited) Fund Fund, Inc. =================================================================================================================================== Investment Income ----------------------------------------------------------------------------------------------------------------------------------- Interest and amortization of premium and accretion of discount....................... $ 23,085,735 $ 19,310,855 Dividends from affiliates............................................................ 43,990 38,985 ---------------------------------- Total income......................................................................... 23,129,725 19,349,840 ---------------------------------- =================================================================================================================================== Expenses ----------------------------------------------------------------------------------------------------------------------------------- Investment advisory fees............................................................. 2,505,316 2,116,326 Interest expense and fees............................................................ 909,099 1,342,994 Commission fees...................................................................... 454,416 390,414 Accounting services.................................................................. 126,307 113,477 Transfer agent fees.................................................................. 46,494 44,844 Professional fees.................................................................... 29,342 27,866 Custodian fees....................................................................... 21,324 19,581 Printing and shareholder reports..................................................... 23,324 20,045 Trustees'/Directors' fees and expenses............................................... 14,648 14,706 Pricing fees......................................................................... 12,569 13,721 Listing fees......................................................................... 11,428 9,314 Other................................................................................ 26,134 30,692 ---------------------------------- Total expenses before waiver and reimbursement....................................... 4,180,401 4,143,980 Waiver and reimbursement of expenses................................................. (225,233) (178,915) ---------------------------------- Total expenses after waiver and reimbursement........................................ 3,955,168 3,965,065 ---------------------------------- Investment income -- net............................................................. 19,174,557 15,384,775 ---------------------------------- ==================================================================================================================================== Realized & Unrealized Gain (Loss) -- Net ------------------------------------------------------------------------------------------------------------------------------------ Realized gain (loss) on: Investments -- net............................................................... 998,297 2,004,671 Financial futures contracts -- net............................................... -- (1,108,769) ---------------------------------- Total realized gain -- net........................................................... 998,297 895,902 ---------------------------------- Change in unrealized appreciation/depreciation on: Investments -- net............................................................... 870,074 4,058,025 Financial futures contracts -- net............................................... -- 710,658 ---------------------------------- Total change in unrealized appreciation/depreciation -- net.......................... 870,074 4,768,683 ---------------------------------- Total realized and unrealized gain -- net............................................ 1,868,371 5,664,585 ---------------------------------- =================================================================================================================================== Dividends to Preferred Shareholders/Preferred Stock Shareholders ----------------------------------------------------------------------------------------------------------------------------------- Investment income -- net............................................................. (6,341,941) (4,988,863) ---------------------------------- Net Increase in Net Assets Resulting from Operations................................. $ 14,700,987 $ 16,060,497 ================================== See Notes to Financial Statements. SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 21 Statements of Changes in Net Assets BlackRock MuniHoldings Florida Insured Fund For the Six Months Ended For the February 28, Year Ended 2007 August 31, Increase (Decrease) in Net Assets: (Unaudited) 2006 =================================================================================================================================== Operations ----------------------------------------------------------------------------------------------------------------------------------- Investment income -- net............................................................. $ 19,174,557 $ 39,348,039 Realized gain -- net................................................................. 998,297 2,573,306 Change in unrealized appreciation/depreciation -- net................................ 870,074 (20,555,330) Dividends to Preferred Shareholders.................................................. (6,341,941) (11,116,657) ---------------------------------- Net increase in net assets resulting from operations................................. 14,700,987 10,249,358 ---------------------------------- =================================================================================================================================== Dividends to Common Shareholders ----------------------------------------------------------------------------------------------------------------------------------- Investment income -- net............................................................. (13,899,366) (31,752,842) ---------------------------------- Net decrease in net assets resulting from dividends to Common Shareholders........... (13,899,366) (31,752,842) ---------------------------------- =================================================================================================================================== Capital Share Transactions ----------------------------------------------------------------------------------------------------------------------------------- Value of shares issued to Common Shareholders in reinvestment of dividends........... -- 66,617 ---------------------------------- Net increase in net assets derived from capital share transactions................... -- 66,617 ---------------------------------- =================================================================================================================================== Net Assets Applicable to Common Shares ----------------------------------------------------------------------------------------------------------------------------------- Total increase (decrease) in net assets applicable to Common Shares.................. 801,621 (21,436,867) Beginning of period.................................................................. 555,493,846 576,930,713 ---------------------------------- End of period*....................................................................... $ 556,295,467 $ 555,493,846 ================================== * Undistributed investment income -- net........................................... $ 1,948,263 $ 3,015,013 ================================== See Notes to Financial Statements. BlackRock MuniHoldings New York Insured Fund, Inc. For the Six Months Ended For the February 28, Year Ended 2007 August 31, Increase (Decrease) in Net Assets: (Unaudited) 2006 =================================================================================================================================== Operations ----------------------------------------------------------------------------------------------------------------------------------- Investment income -- net............................................................. $ 15,384,775 $ 31,812,639 Realized gain -- net................................................................. 895,902 6,241 Change in unrealized appreciation/depreciation -- net................................ 4,768,683 (14,930,448) Dividends to Preferred Stock shareholders............................................ (4,988,863) (8,834,136) ---------------------------------- Net increase in net assets resulting from operations................................. 16,060,497 8,054,296 ---------------------------------- =================================================================================================================================== Dividends to Common Stock Shareholders ----------------------------------------------------------------------------------------------------------------------------------- Investment income -- net............................................................. (10,901,479) (25,985,593) ---------------------------------- Net decrease in net assets resulting from dividends to Common Stock shareholders..... (10,901,479) (25,985,593) ---------------------------------- =================================================================================================================================== Capital Stock Transactions ----------------------------------------------------------------------------------------------------------------------------------- Value of shares issued to Common Stock shareholders in reinvestment of dividends..... -- 156,161 ---------------------------------- Net increase in net assets derived from capital stock transactions................... -- 156,161 ---------------------------------- =================================================================================================================================== Net Assets Applicable to Common Stock ----------------------------------------------------------------------------------------------------------------------------------- Total increase (decrease) in net assets applicable to Common Stock................... 5,159,018 (17,775,136) Beginning of period.................................................................. 460,638,331 478,413,467 ---------------------------------- End of period*....................................................................... $ 465,797,349 $ 460,638,331 ================================== * Undistributed investment income -- net......................................... $ 1,786,515 $ 2,292,082 ================================== See Notes to Financial Statements. 22 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Financial Highlights BlackRock MuniHoldings Florida Insured Fund For the Six Months Ended The following per share data and ratios February 28, For the Year Ended August 31, have been derived from information 2007 -------------------------------------------------------------- provided in the financial statements. (Unaudited) 2006 2005 2004 2003 2002 ================================================================================================================================== Per Share Operating Performance ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period........... $ 14.75 $ 15.32 $ 15.37 $ 15.04 $ 15.41 $ 15.29 --------------------------------------------------------------------------- Investment income -- net....................... .51+ 1.04+ 1.09+ 1.11+ 1.15+ 1.14 Realized and unrealized gain (loss) -- net..... .05 (.47) .05 .31 (.46) .06 Dividends and distributions to Preferred Shareholders: Investment income -- net................... (.17) (.30) (.18) (.09) (.10) (.13) Realized gain -- net....................... -- -- -- -- -- --++ --------------------------------------------------------------------------- Total from investment operations............... .39 .27 .96 1.33 .59 1.07 --------------------------------------------------------------------------- Less dividends and distributions to Common Shareholders: Investment income -- net................... (.37) (.84) (1.01) (1.00) (.96) (.95) Realized gain -- net....................... -- -- -- -- -- --++ --------------------------------------------------------------------------- Total dividends and distributions to Common Shareholders................................. (.37) (.84) (1.01) (1.00) (.96) (.95) --------------------------------------------------------------------------- Net asset value, end of period................. $ 14.77 $ 14.75 $ 15.32 $ 15.37 $ 15.04 $ 15.41 =========================================================================== Market price per share, end of period.......... $ 13.81 $ 14.37 $ 15.75 $ 14.84 $ 14.08 $ 14.66 =========================================================================== ================================================================================================================================== Total Investment Return* ---------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share............. 2.77%@ 2.10% 6.49% 9.43% 4.17% 7.75% =========================================================================== Based on market price per share................ (1.37%)@ (3.24%) 13.39% 12.86% 2.51% 11.63% =========================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Common Shares ---------------------------------------------------------------------------------------------------------------------------------- Total expenses, net of waiver and reimbursement and excluding reorganization and interest expense and fees**........................... 1.11%@@ 1.12% 1.11% 1.10% 1.10% 1.13% =========================================================================== Total expenses, net of waiver and reimbursement and excluding reorganization expenses**...... 1.44%@@ 1.38% 1.35% 1.24% 1.26% 1.34% =========================================================================== Total expenses, excluding reorganization expenses**................................... 1.52%@@ 1.46% 1.41% 1.31% 1.33% 1.41% =========================================================================== Total expenses**............................... 1.52%@@ 1.46% 1.41% 1.31% 1.33% 1.42% =========================================================================== Total investment income -- net**............... 6.96%@@ 7.08% 7.11% 7.23% 7.40% 7.71% =========================================================================== Amount of dividends to Preferred Shareholders.. 2.30%@@ 2.00% 1.15% .60% .65% .96% =========================================================================== Investment income -- net, to Common Shareholders................................. 4.66%@@ 5.08% 5.96% 6.63% 6.75% 6.75% =========================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Preferred Shares ---------------------------------------------------------------------------------------------------------------------------------- Dividends to Preferred Shareholders............ 3.52%@@ 3.06% 1.82% .95% 1.06% 1.49% =========================================================================== ================================================================================================================================== Supplemental Data ---------------------------------------------------------------------------------------------------------------------------------- Net assets applicable to Common Shares, end of period (in thousands)........................ $556,295 $555,494 $576,931 $578,509 $565,993 $580,003 =========================================================================== Preferred Shares outstanding at liquidation preference, end of period (in thousands)............................... $363,250 $363,250 $363,250 $363,250 $363,250 $363,250 =========================================================================== Portfolio turnover............................. 8% 43% 26% 20% 23% 13% =========================================================================== ================================================================================================================================== Leverage ---------------------------------------------------------------------------------------------------------------------------------- Asset coverage per $1,000...................... $ 2,531 $ 2,529 $ 2,588 $ 2,593 $ 2,558 $ 2,597 =========================================================================== ================================================================================================================================== Dividends Per Share on Preferred Shares Outstanding ---------------------------------------------------------------------------------------------------------------------------------- Series A -- Investment income -- net........... $ 438 $ 755 $ 441 $ 233 $ 252 $ 362 =========================================================================== Series B -- Investment income -- net........... $ 435 $ 778 $ 451 $ 237 $ 267 $ 375 =========================================================================== Series C -- Investment income -- net........... $ 438 $ 780 $ 461 $ 237 $ 252 $ 369 =========================================================================== Series D -- Investment income -- net........... $ 433 $ 743 $ 462 $ 243 $ 273 $ 368 =========================================================================== Series E -- Investment income -- net........... $ 438 $ 757 $ 463 $ 241 $ 276 $ 381 =========================================================================== * Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns. Total investment returns exclude the effects of sales charges. ** Do not reflect the effect of dividends to Preferred Shareholders. + Based on average shares outstanding. ++ Amount is less than $(.01) per share. @ Aggregate total investment return. @@ Annualized. See Notes to Financial Statements. SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 23 Financial Highlights BlackRock MuniHoldings New York Insured Fund, Inc. For the Six Months Ended The following per share data and ratios February 28, For the Year Ended August 31, have been derived from information 2007 -------------------------------------------------------------- provided in the financial statements. (Unaudited) 2006 2005 2004 2003 2002 ================================================================================================================================== Per Share Operating Performance ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period........... $ 14.96 $ 15.54 $ 15.41 $ 15.19 $ 15.66 $ 15.78 --------------------------------------------------------------------------- Investment income -- net**..................... .50 1.03 1.04 1.05 1.09 1.07 Realized and unrealized gain (loss) -- net..... .18 (.48) .21 .18 (.58) (.19) Less dividends to Preferred Stock shareholders from investment income -- net................ (.16) (.29) (.17) (.08) (.08) (.12) --------------------------------------------------------------------------- Total from investment operations............... .52 .26 1.08 1.15 .43 .76 --------------------------------------------------------------------------- Less dividends to Common Stock shareholders from investment income -- net................ (.35) (.84) (.95) (.93) (.90) (.88) --------------------------------------------------------------------------- Net asset value, end of period................. $ 15.13 $ 14.96 $ 15.54 $ 15.41 $ 15.19 $ 15.66 =========================================================================== Market price per share, end of period.......... $ 14.08 $ 14.62 $ 15.28 $ 14.10 $ 13.79 $ 14.37 =========================================================================== ================================================================================================================================== Total Investment Return*** ---------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share............. 3.65%+ 1.98% 7.63% 8.36% 3.32% 5.68% =========================================================================== Based on market price per share................ (1.30%)+ 1.36% 15.66% 9.21% 2.22% 6.49% =========================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Common Stock ---------------------------------------------------------------------------------------------------------------------------------- Total expenses, net of waiver and reimbursements and excluding reorganization and interest expense and fees****............ 1.14%* 1.15% 1.14% 1.14% 1.13% 1.16% =========================================================================== Total expenses, net of waiver and reimbursement excluding reorganization expenses****........ 1.73%* 1.65% 1.52% 1.43% 1.43% 1.37% =========================================================================== Total expenses, excluding reorganization expenses****................................. 1.81%* 1.73% 1.59% 1.50% 1.51% 1.44% =========================================================================== Total expenses****............................. 1.81%* 1.73% 1.59% 1.50% 1.51% 1.47% =========================================================================== Total investment income -- net****............. 6.70%* 6.94% 6.71% 6.80% 6.96% 7.01% =========================================================================== Amount of dividends to Preferred Stock shareholders................................. 2.17%* 1.93% 1.09% .55% .68% .98% =========================================================================== Investment income -- net, to Common Stock shareholders................................. 4.53%* 5.01% 5.62% 6.25% 6.28% 6.03% =========================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Preferred Stock ---------------------------------------------------------------------------------------------------------------------------------- Dividends to Preferred Stock shareholders...... 3.21%* 2.82% 1.66% .83% 1.05% 1.47% =========================================================================== ================================================================================================================================== Supplemental Data ---------------------------------------------------------------------------------------------------------------------------------- Net assets applicable to Common Stock, end of period (in thousands)........................ $465,797 $460,638 $478,413 $474,357 $467,512 $482,184 =========================================================================== Preferred Stock outstanding at liquidation preference, end of period (in thousands)..... $313,000 $313,000 $313,000 $313,000 $313,000 $313,000 =========================================================================== Portfolio turnover............................. 14% 47% 33% 31% 50% 79% =========================================================================== ================================================================================================================================== Leverage ---------------------------------------------------------------------------------------------------------------------------------- Asset coverage per $1,000...................... $ 2,488 $ 2,472 $ 2,528 $ 2,516 $ 2,494 $ 2,541 =========================================================================== ================================================================================================================================== Dividends Per Share on Preferred Stock Outstanding ---------------------------------------------------------------------------------------------------------------------------------- Series A -- Investment income -- net........... $ 391 $ 689 $ 409 $ 197 $ 247 $ 347 =========================================================================== Series B -- Investment income -- net........... $ 394 $ 678 $ 385 $ 182 $ 236 $ 348 =========================================================================== Series C -- Investment income -- net........... $ 401 $ 715 $ 432 $ 201 $ 258 $ 377 =========================================================================== Series D -- Investment income -- net........... $ 403 $ 728 $ 434 $ 238 $ 287 $ 391 =========================================================================== Series E -- Investment income -- net........... $ 397 $ 692 $ 389 $ 198 $ 256 $ 347 =========================================================================== * Annualized. ** Based on average shares outstanding. *** Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns. Total investment returns exclude the effects of sales charges. **** Do not reflect the effect of dividends to Preferred Stock Shareholders. + Aggregate total investment return. See Notes to Financial Statements. 24 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Notes to Financial Statements (Unaudited) 1. Significant Accounting Policies: BlackRock MuniHoldings Florida Insured Fund and BlackRock MuniHoldings New York Insured Fund, Inc. (the "Funds" or individually the "Fund") are registered under the Investment Company Act of 1940, as amended, as non-diversified, closed-end management investment companies. The Funds' financial statements are prepared in conformity with U.S. generally accepted accounting principles, which may require the use of management accruals and estimates. Actual results may differ from these estimates. These unaudited financial statements reflect all adjustments which are, in the opinion of management, necessary to present a fair statement of the results for the interim period. The Funds determine and make available for publication the net asset value of their Common Stock/Shares on a daily basis. The Funds' Common Stock/Shares are listed on the New York Stock Exchange under the symbols MFL and MHN, respectively. The following is a summary of significant accounting policies followed by the Funds. (a) Valuation of investments -- Municipal bonds are traded primarily in the over-the-counter ("OTC") markets and are valued at the last available bid price in the OTC market or on the basis of values as obtained by a pricing service. Pricing services use valuation matrixes that incorporate both dealer-supplied valuations and valuation models. The procedures of the pricing service and its valuations are reviewed by the officers of the Funds under the general direction of the Board of Directors/Trustees. Such valuations and procedures are reviewed periodically by the Board of Directors/Trustees of the Funds. Financial futures contracts and options thereon, which are traded on exchanges, are valued at their closing prices as of the close of such exchanges. Options written or purchased are valued at the last sale price in the case of exchange-traded options. In the case of options traded in the OTC market, valuation is the last asked price (options written) or the last bid price (options purchased). Swap agreements are valued based upon quoted fair valuations received daily by the Funds from a pricing service. Short-term investments with a remaining maturity of 60 days or less are valued at amortized cost, which approximates market value, under which method the investment is valued at cost and any premium or discount is amortized on a straight line basis to maturity. Investments in open-end investment companies are valued at their net asset value each business day. Securities and other assets for which market quotations are not readily available are valued at fair value as determined in good faith by or under the direction of the Board of Directors/Trustees of the Funds. (b) Derivative financial instruments -- Each Fund may engage in various portfolio investment strategies both to increase the return of the Fund and to hedge, or protect, its exposure to interest rate movements and movements in the securities markets. Losses may arise due to changes in the value of the contract due to an unfavorable change in the price of the underlying security or index or if the counterparty does not perform under the contract. The counterparty for certain instruments may pledge cash or securities as collateral. o Financial futures contracts -- Each Fund may purchase or sell financial futures contracts and options on such financial futures contracts. Financial futures contracts are contracts for delayed delivery of securities at a specific future date and at a specific price or yield. Upon entering into a contract, the Fund deposits and maintains as collateral such initial margin as required by the exchange on which the transaction is effected. Pursuant to the contract, the Fund agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in value of the contract. Such receipts or payments are known as variation margin and are recorded by the Fund as unrealized gains or losses. When the contract is closed, the Fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. o Options -- Each Fund may write covered call options and purchase call and put options. When the Fund writes an option, an amount equal to the premium received by the Fund is reflected as an asset and an equivalent liability. The amount of the liability is subsequently marked-to-market to reflect the current market value of the option written. When a security is purchased or sold through an exercise of an option, the related premium paid (or received) is added to (or deducted from) the basis of the security acquired or deducted from (or added to) the proceeds of the security sold. When an option expires (or the Fund enters into a closing transaction), the Fund realizes a gain or loss on the option to the extent of the premiums received or paid (or gain or loss to the extent the cost of the closing transaction exceeds the premium paid or received). Written and purchased options are non-income producing investments. o Forward interest rate swaps -- Each Fund may enter into forward interest rate swaps. In a forward interest rate swap, the Fund and the counterparty agree to make periodic net payments on a specified notional contract SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 25 Notes to Financial Statements (continued) amount, commencing on a specified future effective date, unless terminated earlier. When the agreement is closed, the Fund records a realized gain or loss in an amount equal to the value of the agreement. o Swaps -- Each Fund may enter into swap agreements, which are OTC contracts in which the Fund and a counterparty agree to make periodic net payments on a specified notional amount. The net payments can be made for a set period of time or may be triggered by a predetermined credit event. The net periodic payments may be based on a fixed or variable interest rate; the change in market value of a specified security, basket of securities or index; or the return generated by a security. These periodic payments received or made by the Fund are recorded in the accompanying Statement of Operations as realized gains or losses, respectively. Gains or losses are also realized upon termination of the swap agreements. Swaps are marked-to-market daily and changes in value are recorded as unrealized appreciation (depreciation). Risks include changes in the returns of the underlying instruments, failure of the counterparties to perform under the contracts' terms and the possible lack of liquidity with respect to the swap agreements. (c) Municipal bonds held in trust -- The Funds invest in leveraged residual certificates ("TOB Residuals") issued by tender option bond trusts ("TOBs"). A TOB is established by a third party sponsor forming a special purpose entity, into which a Fund, or an agent on behalf of the Fund, transfers municipal securities. A TOB typically issues two classes of beneficial interests: short-term floating rate certificates, which are sold to third party investors, and residual certificates, which are generally issued to the Fund which made the transfer or to affiliates of the Fund. Each Fund's transfers of the municipal securities to a TOB do not qualify for sale treatment under Statement of Financial Accounting Standards No. 140 "Accounting for Transfers and Servicing of Financial Assets and Extinguishments of Liabilities," therefore the municipal securities deposited into a TOB are presented in the Funds' schedules of investments and the proceeds from the transactions are reported as a liability for trust certificates of the Funds. Similarly, proceeds from residual certificates issued to affiliates, if any, from the transaction are included in the liability for trust certificates. Interest income from the underlying security is recorded by the Funds on an accrual basis. Interest expense incurred on the secured borrowing and other expenses related to remarketing, administration and trustee services to a TOB are reported as expenses of a Fund. The floating rate certificates have interest rates that generally reset weekly and their holders have the option to tender certificates to the TOB for redemption at par at each reset date. The residual interests held by the Funds include the right of the Funds (1) to cause the holders of a proportional share of floating rate certificates to tender their certificates at par, and (2) to transfer a corresponding share of the municipal securities from the TOB to the Funds. At February 28, 2007, the aggregate value of the underlying municipal securities transferred to TOBs and the related liability for trust certificates were: -------------------------------------------------------------------------------- Range of Interest Underlying Liability Rates on the Municipal for Liability Bonds Trust for Trust Transferred Certificates Certificates to TOBs -------------------------------------------------------------------------------- BlackRock MuniHoldings Florida Insured Fund ... $44,416,493 3.56% - 3.58% $ 93,022,442 BlackRock MuniHoldings New York Insured Fund, Inc. ............. $61,017,240 3.53% - 3.58% $115,393,714 -------------------------------------------------------------------------------- Financial transactions executed through TOBs generally will underperform the market for fixed rate municipal bonds in a rising interest rate environment, but tend to outperform the market for fixed rate bonds when interest rates decline or remain relatively stable. Should short-term interest rates rise, the Funds' investments in TOB Residuals likely will adversely affect the Funds' investment income -- net and distributions to shareholders. Fluctuations in the market value of municipal securities deposited into the TOB may adversely affect the Funds' net asset value per share. While the Funds' investment policies and restrictions expressly permit investments in inverse floating rate securities such as TOB Residuals, they generally do not allow the Funds to borrow money for purposes of making investments. The Funds' management believes that the Funds' restrictions on borrowings do not apply to the secured borrowings deemed to have occurred for accounting purposes. (d) Income taxes -- It is each Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its taxable income to its shareholders. Therefore, no federal income tax provision is required. (e) Security transactions and investment income -- Security transactions are recorded on the dates the transactions are entered into (the trade dates). Realized gains and losses on security transactions are determined on the identified cost basis. Dividend income is recorded on the ex-dividend dates. Interest income is recognized on the accrual basis. The Funds amortize all premiums and discounts on debt securities. 26 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Notes to Financial Statements (continued) (f) Dividends and distributions -- Dividends from net investment income are declared and paid monthly. Distributions of capital gains are recorded on the ex-dividend dates. (g) Recent accounting pronouncements -- In July 2006, the Financial Accounting Standards Board ("FASB") issued Interpretation No. 48 ("FIN 48"), "Accounting for Uncertainty in Income Taxes -- an interpretation of FASB Statement No. 109." FIN 48 prescribes the minimum recognition threshold a tax position must meet in connection with accounting for uncertainties in income tax positions taken or expected to be taken by an entity including mutual funds before being measured and recognized in the financial statements. Adoption of FIN 48 is required for the last net asset value calculation in the first required financial statement reporting period for fiscal years beginning after December 15, 2006. The impact on the Funds' financial statements, if any, is currently being assessed. In September 2006, Statement of Financial Accounting Standards No. 157, "Fair Value Measurements" ("FAS 157"), was issued and is effective for fiscal years beginning after November 15, 2007. FAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. At this time, management is evaluating the implications of FAS 157 and its impact on the Funds' financial statements, if any, has not been determined. In addition, in February 2007, FASB issued "Statement of Financial Accounting Standards No. 159, The Fair Value Option for Financial Assets and Financial Liabilities" ("FAS 159"), which is effective for fiscal years beginning after November 15, 2007. Early adoption is permitted as of the beginning of a fiscal year that begins on or before November 15, 2007, provided the entity also elects to apply the provisions of FAS 157. FAS 159 permits entities to choose to measure many financial instruments and certain other items at fair value that are not currently required to be measured at fair value. FAS 159 also establishes presentation and disclosure requirements designed to facilitate comparisons between entities that choose different measurement attributes for similar types of assets and liabilities. At this time, management is evaluating the implications of FAS 159 and its impact on the Funds' financial statements, if any, has not been determined. 2. Investment Advisory Agreement and Transactions with Affiliates: On September 29, 2006, BlackRock, Inc. ("BlackRock") and Merrill Lynch & Co., Inc. ("Merrill Lynch") combined Merrill Lynch's investment management business, Merrill Lynch Investment Managers, L.P. ("MLIM"), and its affiliates, including Fund Asset Management, L.P. ("FAM"), with BlackRock, Inc. to create a new independent company. Merrill Lynch has a 49.8% economic interest and a 45% voting interest in the combined company and The PNC Financial Services Group, Inc. has approximately a 34% economic and voting interest. The new company operates under the BlackRock name and is governed by a board of directors with a majority of independent members. The Investment Advisory Agreement between each Fund and BlackRock Advisors, LLC (the "Manager"), an indirect, wholly owned subsidiary of BlackRock, Inc., became effective on September 29, 2006. Prior to September 29, 2006, FAM was the Funds' Manager. The general partner of FAM is Princeton Services, Inc. ("PSI"), an indirect, wholly owned subsidiary of Merrill Lynch, which is the limited partner. The Manager is responsible for the management of each Fund's portfolio and provides the necessary personnel, facilities, equipment and certain other services necessary to the operations of the Fund. For such services, each Fund pays a monthly fee at an annual rate of .55% of the Fund's average daily net assets, including proceeds from the issuance of Preferred Shares/Stock. The Manager (and previously FAM) has agreed to reimburse its management fee by the amount of management fees each Fund pays to the Manager (and formerly FAM) indirectly through its investments described below: -------------------------------------------------------------------------------- For the For the Period Period Sept. Sept. 1, 2006 30, 2006 to Sept. 29, to Feb. 28, 2006 Reim- 2007 Reim- bursement bursement by Investment by FAM the Manager -------------------------------------------------------------------------------- BlackRock CMA Florida MuniHoldings Municipal Florida Insured Money Fund Fund............... $9,587 $43,372 BlackRock CMA New York MuniHoldings Municipal New York Insured Money Fund Fund, Inc. ........ $ 58 $ 5,071 -------------------------------------------------------------------------------- SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 27 Notes to Financial Statements (continued) In addition, the Manager has agreed to reimburse its management fee on the proceeds of Preferred Shares/Stock that exceeds 35% of each Fund's total net assets. For the six months ended February 28, 2007, FAM and the Manager earned and waived the following : -------------------------------------------------------------------------------- For the Period For the Period Sept. 1, to Sept. 29, 2006 to Sept. 29, 2006 Feb. 28, 2007 ---------------- ------------------------- Earned Waived Earned by Waived by by FAM by FAM the Manager the Manager -------------------------------------------------------------------------------- BlackRock Muni- Holdings Florida Insured Fund.......... $429,126 $29,982 $2,076,190 $142,292 BlackRock Muni- Holdings New York Insured Fund, Inc. ... $361,539 $30,263 $1,754,787 $143,523 -------------------------------------------------------------------------------- For the six months ended February 28, 2007, the Funds reimbursed FAM and the Manager for certain accounting services. The reimbursements were as follows: -------------------------------------------------------------------------------- FAM Manager -------------------------------------------------------------------------------- BlackRock MuniHoldings Florida Insured Fund ...................... $1,527 $7,635 BlackRock MuniHoldings New York Insured Fund, Inc. ............... $1,282 $6,411 -------------------------------------------------------------------------------- In addition, the Manager has entered into a separate sub-advisory agreement with BlackRock Investment Management, LLC, ("BIM"), an affiliate of the Manager, with respect to each Fund, under which the Manager pays the Sub-Adviser for services it provides a monthly fee that is a percentage of the management fee paid by the Funds to the Manager. Prior to September 29, 2006, certain officers and/or directors/trustees of the Funds were officers and/or directors of FAM, PSI, Merrill Lynch, and/or MLIM. Commencing September 29, 2006, certain officers and/or directors/trustees of the Funds are officers and/or directors of BlackRock, Inc. or its affiliates. 3. Investments: Purchases and sales of investments, excluding short-term securities, for the six months ended February 28, 2007 were as follows: -------------------------------------------------------------------------------- BlackRock BlackRock MuniHoldings MuniHoldings Florida Insured New York Insured Fund Fund, Inc. -------------------------------------------------------------------------------- Total Purchases ................ $81,247,992 $123,759,139 Total Sales .................... $70,391,477 $116,009,464 -------------------------------------------------------------------------------- 4. Share/Stock Transactions: BlackRock MuniHoldings Florida Insured Fund is authorized to issue an unlimited number of shares of beneficial interest, including Preferred Shares, par value $.10 per share, all of which were initially classified as Common Shares. The Board of Trustees is authorized, however, to reclassify any unissued shares of beneficial interest without the approval of holders of Common Shares. BlackRock MuniHoldings New York Insured Fund, Inc. is authorized to issue 200,000,000 shares of stock, including Preferred Stock, par value $.10 per share, all of which were initially classified as Common Stock. The Board of Directors is authorized, however, to reclassify any unissued shares of stock without approval of holders of Common Stock. Common Shares/Stock BlackRock MuniHoldings Florida Insured Fund Shares issued and outstanding during the six months ended February 28, 2007 remained constant and increased by 4,505 as a result of dividend reinvestments for the year ended August 31, 2006. BlackRock MuniHoldings New York Insured Fund, Inc. Shares issued and outstanding during the six months ended February 28, 2007 remained constant and increased by 10,523 as a result of dividend reinvestment for the year ended August 31, 2006. Preferred Shares/Stock Auction Market Preferred Shares/Stock are redeemable shares of Preferred Shares/Stock of the Funds, with a liquidation preference of $25,000 per share plus accrued and unpaid dividends that entitle their holders to receive cash dividends at an annual rate that may vary for the successive dividend periods. 28 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 Notes to Financial Statements (continued) The yields in effect at February 28, 2007 were as follows: -------------------------------------------------------------------------------- BlackRock BlackRock MuniHoldings MuniHoldings Florida Insured New York Insured Fund Fund, Inc. -------------------------------------------------------------------------------- Series A....................... 3.612% 3.00% Series B....................... 3.52% 2.88% Series C....................... 3.55% 3.20% Series D....................... 3.50% 3.20% Series E....................... 3.51% 3.25% -------------------------------------------------------------------------------- Each Fund pays commissions to certain broker-dealers at the end of each auction at an annual rate ranging from .25% to .375%, calculated on the proceeds of each auction. For the six months ended February 28, 2007, Merrill Lynch, Pierce, Fenner & Smith Incorporated, a wholly owned subsidiary of Merrill Lynch, earned commissions as follows: -------------------------------------------------------------------------------- Fund Commissions -------------------------------------------------------------------------------- BlackRock MuniHoldings Florida Insured Fund.............................. $207,673 BlackRock MuniHoldings New York Insured Fund, Inc. ...................... $139,971 -------------------------------------------------------------------------------- 5. Capital Loss Carryforward: BlackRock MuniHoldings Florida Insured Fund On August 31, 2006, the Fund had a net capital loss carryforward of $63,219,214, of which $24,716,150 expires in 2007, $9,949,433 expires in 2008, $18,709,220 expires in 2009, $1,836,991 expires in 2012 and $8,007,420 expires in 2013. This amount will be available to offset like amounts of any future taxable gains. BlackRock MuniHoldings New York Insured Fund, Inc. On August 31, 2006, the Fund had a net capital loss carryforward of $37,884,795, of which $966,000 expires in 2007, $3,509,287 expires in 2008, $17,297,478 expires in 2009, $15,054,033 expires in 2013 and $1,057,997 expires in 2014. This amount will be available to offset like amounts of any future taxable gains. 6. Subsequent Event: BlackRock MuniHoldings Florida Insured Fund The Fund paid a tax-exempt income dividend to holders of Common Shares in the amount of $.058000 per share on April 2, 2007 to shareholders of record on March 15, 2007. BlackRock MuniHoldings New York Insured Fund, Inc. The Fund paid a tax-exempt income dividend to holders of Common Stock in the amount of $.057000 per share on April 2, 2007 to shareholders of record on March 15, 2007. 7. Restatement Information: During the six months ended February 28, 2007, each Fund determined that the criteria for sale accounting in Statement of Financial Accounting Standards No. 140 had not been met for certain transfers of municipal bonds, and that these transfers should have been accounted for as secured borrowings rather than as sales. Accordingly, the Funds have restated the Statements of Changes in Net Assets for the year ended August 31, 2006 and certain financial highlights for each of the five years in the period then ended. The effects of the restatement were to record the transfers of the municipal bonds as secured borrowings, to give effect to offsetting changes in realized gain -- net and in the change in unrealized appreciation/depreciation -- net on the transferred municipal securities and to give effect to interest on the bonds as interest income and interest on the secured borrowings as interest expense. -------------------------------------------------------------------------------- BlackRock MuniHoldings Florida Insured Fund -------------------------------------------------------------------------------- Statement of Changes in Net Assets For the Year Ended August 31, 2006 -------------------------------------------------------------------------------- Previously Reported Restated -------------------------------------------------------------------------------- Realized gain -- net.............. $ 2,496,479 $ 2,573,306 Change in unrealized appreciation/ depreciation -- net............. $(20,478,503) $(20,555,330) -------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------------------------------------ BlackRock MuniHoldings Florida Insured Fund ------------------------------------------------------------------------------------------------------------------------------------ Financial Highlights For the Years Ended August 31, 2006, 2005, 2004, 2003 and 2002 ------------------------------------------------------------------------------------------------------------------------------------ 2006 2005 2004 2003 2002 --------------------- --------------------- --------------------- --------------------- --------------------- Previously Previously Previously Previously Previously Reported Restated Reported Restated Reported Restated Reported Restated Reported Restated ------------------------------------------------------------------------------------------------------------------------------------ Total expenses, net of waiver and reimbursement and excluding reorganization expenses** .... 1.12% 1.38% 1.11% 1.35% 1.10% 1.24% 1.10% 1.26% 1.13% 1.34% Total expenses, excluding reorganization expenses** .... 1.19% 1.46% 1.16% 1.41% 1.17% 1.31% 1.17% 1.33% 1.20% 1.41% Total expenses** 1.19% 1.46% 1.16% 1.41% 1.17% 1.31% 1.17% 1.33% 1.21% 1.42% Portfolio turnover ...... 45.72% 43% 26.50% 26% 21.20% 20% 27.40% 23% 13.89% 13% ------------------------------------------------------------------------------------------------------------------------------------ ** Do not reflect the effect of dividends to Preferred Shareholders. SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 29 Notes to Financial Statements (concluded) -------------------------------------------------------------------------------- BlackRock MuniHoldings New York Insured Fund, Inc. -------------------------------------------------------------------------------- Statement of Changes in Net Assets For the Year Ended August 31, 2006 -------------------------------------------------------------------------------- Previously Reported Restated -------------------------------------------------------------------------------- Realized gain (loss) -- net............ $ (306,380) $ 6,241 Change in unrealized appreciation/ depreciation -- net.................. $(14,617,827) $(14,930,448) -------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------------------------------------ BlackRock MuniHoldings New York Insured Fund, Inc. ------------------------------------------------------------------------------------------------------------------------------------ Financial Highlights For the Years Ended August 31, 2006, 2005, 2004, 2003 and 2002 ------------------------------------------------------------------------------------------------------------------------------------ 2006 2005 2004 2003 2002 --------------------- --------------------- --------------------- --------------------- --------------------- Previously Previously Previously Previously Previously Reported Restated Reported Restated Reported Restated Reported Restated Reported Restated ------------------------------------------------------------------------------------------------------------------------------------ Total expenses, net of waiver and reimbursement and excluding reorganization expenses** .... 1.15% 1.65% 1.14% 1.52% 1.14% 1.43% 1.13% 1.43% 1.16% 1.37% Total expenses, excluding reorganization expenses** .... 1.23% 1.73% 1.21% 1.59% 1.21% 1.50% 1.20% 1.51% 1.23% 1.44% Total expenses** 1.23% 1.73% 1.21% 1.59% 1.21% 1.50% 1.20% 1.51% 1.26% 1.47% Portfolio turnover ...... 52.83% 47% 35.63% 33% 32.04% 31% 59.02% 50% 86.39% 79% ------------------------------------------------------------------------------------------------------------------------------------ ** Do not reflect the effect of dividends to Preferred Stock shareholders. While the Statements of Net Assets, including the Schedules of Investments, of the Funds as of August 31, 2006, 2005, 2004, 2003 and 2002, not presented herein, have not been reissued to give effect to the restatement, the principal effects of the restatement would be to increase investments and payable for floating rate certificates by corresponding amounts at each year, with no effect on previously reported net assets. The Statements of Operations of the Funds for the years ended August 31, 2006, 2005, 2004, 2003 and 2002, not presented herein, have not been reissued to give effect to the restatement. However, the principal effects of the restatement would be to increase interest income and interest expense and fees by corresponding amounts each year, and where applicable, to revise realized gain (loss) on investments -- net, and the change in unrealized appreciation/depreciation on investments -- net, by corresponding and offsetting amounts. The Statements of Changes in Net Assets of the Funds for the years ended August 31, 2005, 2004, 2003 and 2002, not presented herein, have not been reissued to give effect to the restatement, but the principal effects of a restatement, where applicable, would be to revise previously reported realized gain (loss) on investments -- net, and change in unrealized appreciation/depreciation -- net, by corresponding and offsetting amounts. Investment Objectives NYSE Symbol BlackRock MuniHoldings Florida Insured Fund seeks to MFL provide shareholders with current income exempt from federal income tax. The Fund also seeks to offer shareholders the opportunity to own shares, the value of which is exempt from Florida intangible personal property tax. The Fund seeks to achieve its investment objective by investing primarily in a portfolio of long-term, investment grade municipal obligations, the interest on which, in the opinion of bond counsel to the issuer, is exempt from federal income taxes and which enables shares of the Fund to be exempt from Florida intangible personal property tax. NYSE Symbol BlackRock MuniHoldings New York Insured Fund, Inc. seeks to MHN provide shareholders with current income exempt from federal income taxes and New York State and New York City personal income taxes by investing primarily in a portfolio of long-term, investment grade municipal obligations, the interest on which, in the opinion of bond counsel to the issuer, is exempt from federal income taxes and New York State and New York City personal income taxes. 30 SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 BlackRock Privacy Principles BlackRock is committed to maintaining the privacy of its current and former fund investors and individual clients (collectively, "Clients") and to safeguarding their nonpublic personal information. The following information is provided to help you understand what personal information BlackRock collects, how we protect that information and why in certain cases we share such information with select parties. If you are located in a jurisdiction where specific laws, rules or regulations require BlackRock to provide you with additional or different privacy-related rights beyond what is set forth below, then BlackRock will comply with those specific laws, rules or regulations. BlackRock obtains or verifies personal nonpublic information from and about you from different sources, including the following: (i) information we receive from you or, if applicable, your financial intermediary, on applications, forms or other documents; (ii) information about your transactions with us, our affiliates, or others; (iii) information we receive from a consumer reporting agency; and (iv) from visits to our Web sites. BlackRock does not sell or disclose to nonaffiliated third parties any nonpublic personal information about its Clients, except as permitted by law or as is necessary to service Client accounts. These nonaffiliated third parties are required to protect the confidentiality and security of this information and to use it only for its intended purpose. We may share information with our affiliates to service your account or to provide you with information about other BlackRock products or services that may be of interest to you. In addition, BlackRock restricts access to nonpublic personal information about its Clients to those BlackRock employees with a legitimate business need for the information. BlackRock maintains physical, electronic and procedural safeguards that are designed to protect the nonpublic personal information of its Clients, including procedures relating to the proper storage and disposal of such information. Officers and Trustees/Directors Robert C. Doll, Jr., President and Trustee/Director Ronald W. Forbes, Trustee/Director Cynthia A. Montgomery, Trustee/Director Jean Margo Reid, Trustee/Director Roscoe S. Suddarth, Trustee/Director Richard R. West, Trustee/Director Donald C. Burke, Vice President and Treasurer John M. Loffredo, Senior Vice President Timothy T. Browse, Vice President Robert D. Sneeden, Vice President Jeffrey Hiller, Fund Chief Compliance Officer Alice A. Pellegrino, Secretary Transfer Agents Common Shares/Stock: The Bank of New York 101 Barclay Street -- 11 East New York, NY 10286 Preferred Shares/Stock: The Bank of New York 101 Barclay Street -- 7 West New York, NY 10286 Custodian The Bank of New York 100 Church Street New York, NY 10286 -------------------------------------------------------------------------------- Effective January 1, 2007, Edward D. Zinbarg retired as a Trustee/Director of BlackRock MuniHoldings Florida Insured Fund and BlackRock MuniHoldings New York Insured Fund, Inc. The Funds' Boards of Trustees/Directors wish Mr. Zinbarg well in his retirement. -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Effective April 13, 2007, Jeffrey Hiller resigned his position as Chief Compliance Officer of the Funds. Also effective April 13, 2007, Karen Clark was appointed Chief Compliance Officer of the Funds. Ms. Clark has been a Managing Director of BlackRock, Inc. since 2007. She was a Director thereof from 2005 to 2007. Prior to that, Ms. Clark was a principal and senior compliance officer at State Street Global Advisors from 2001 to 2005. Ms. Clark was a principal consultant with PricewaterhouseCoopers, LLP from 1998 to 2001. From 1993 to 1998, Ms. Clark was Branch Chief, Division of Investment Management and Office of Compliance Examinations, with the U.S. Securities and Exchange Commission. -------------------------------------------------------------------------------- SEMI-ANNUAL REPORTS FEBRUARY 28, 2007 31 These reports, including the financial information herein, are transmitted to shareholders of BlackRock MuniHoldings Florida Insured Fund and BlackRock MuniHoldings New York Insured Fund, Inc. for their information. This is not a prospectus. Past per formance results shown in this report should not be considered a representation of future performance. The Funds have leveraged their Common Shares or Stock and intend to remain leveraged by issuing Preferred Shares or Stock to provide the Common Shareholders or Common Stock shareholders with a potentially higher rate of return. Leverage creates risks for Common Shareholders or Common Stock shareholders, including the likelihood of greater volatility of net asset value and market price of shares of the Common Shares or Stock, and the risk that fluctuations in the short-term dividend rates of the Preferred Shares or Stock may affect the yield to Common Shareholders or Common Stock shareholders. Statements and other information herein are as dated and are subject to change. A description of the policies and procedures that the Funds use to determine how to vote proxies relating to portfolio securities is available (1) without charge, upon request, by calling toll-free 1-800-441-7762; (2) at www.blackrock.com; and (3) on the Securities and Exchange Commission's Web site at http://www.sec.gov. Infor mation about how the Funds vote proxies relating to securities held in the Funds' portfolios during the most recent 12-month period ended June 30 is available (1) at www.blackrock.com and (2) on the Securities and Exchange Commission's Web site at http://www.sec.gov. BlackRock MuniHoldings Florida Insured Fund BlackRock MuniHoldings New York Insured Fund, Inc. P.O. Box 9011 Princeton, NJ 08543-9011 BlackRock #MHFLNY-2/07 Item 2 - Code of Ethics - Not Applicable to this semi-annual report Item 3 - Audit Committee Financial Expert - Not Applicable to this semi-annual report Item 4 - Principal Accountant Fees and Services - Not Applicable to this semi-annual report Item 5 - Audit Committee of Listed Registrants - Not Applicable to this semi-annual report Item 6 - Schedule of Investments - Not Applicable Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies - Not Applicable to this semi-annual report Item 8 - Portfolio Managers of Closed-End Management Investment Companies - as of February 28, 2007. (a)(1) BlackRock MuniHoldings Florida Insured Fund is managed by a team of investment professionals comprised of Robert D. Sneeden, Director at BlackRock, Theodore R. Jaeckel, Jr., CFA, Managing Director at BlackRock, and Walter O'Connor, Managing Director at BlackRock. Each is a member of BlackRock's municipal tax-exempt management group. Mr. Jaeckel and Mr. O'Connor are responsible for setting the Fund's overall investment strategy and overseeing the management of the Fund. Mr. Sneeden is the Fund's lead portfolio manager and is responsible for the day-to-day management of the Fund's portfolio and the selection of its investments. Messrs. Jaeckel and O'Connor have been members of the Fund's management team since 2006 and Mr. Sneeden has been the Fund's portfolio manager since 1998. Mr. Jaeckel joined BlackRock in 2006. Prior to joining BlackRock, he was a Managing Director (Municipal Tax-Exempt Fund Management) of Merrill Lynch Investment Managers, L.P. (""MLIM") from 2005 to 2006 and a Director of MLIM from 1997 to 2005. He has been a portfolio manager with BlackRock or MLIM since 1991. Mr. O'Connor joined BlackRock in 2006. Prior to joining BlackRock, he was a Managing Director (Municipal Tax-Exempt Fund Management) of MLIM from 2003 to 2006 and was a Director of MLIM from 1997 to 2002. He has been a portfolio manager with BlackRock or MLIM since 1991. Mr. Sneeden joined BlackRock in 2006. Prior to joining BlackRock, he was a Director (Municipal Tax-Exempt Fund Management) of MLIM since 2006 and was a Vice President of MLIM from 1998 to 2006. Mr. Sneeden has been a portfolio manager with BlackRock or MLIM since 1994. (a)(2) As of February 28, 2007: (iii) Number of Other Accounts and (ii) Number of Other Accounts Managed Assets for Which Advisory Fee is and Assets by Account Type Performance-Based Other Other Registered Other Pooled Registered Other Pooled (i) Name of Investment Investment Other Investment Investment Other Portfolio Manager Companies Vehicles Accounts Companies Vehicles Accounts ---------- ---------- Robert Sneeden 12 0 0 0 0 0 $ 2,262,466,608 $ 0 $ 0 $ 0 $ 0 $ 0 Theodore R. Jaeckel, Jr. 80 0 0 0 1 0 $28,849,201,248 $ 0 $ 0 $ 0 $ 28,165,980 $ 0 Walter O'Connor 80 0 0 0 0 0 $28,849,201,248 $ 0 $ 0 $ 0 $ 0 $ 0 (iv) Potential Material Conflicts of Interest BlackRock has built a professional working environment, firm-wide compliance culture and compliance procedures and systems designed to protect against potential incentives that may favor one account over another. BlackRock has adopted policies and procedures that address the allocation of investment opportunities, execution of portfolio transactions, personal trading by employees and other potential conflicts of interest that are designed to ensure that all client accounts are treated equitably over time. Nevertheless, BlackRock furnishes investment management and advisory services to numerous clients in addition to the Fund, and BlackRock may, consistent with applicable law, make investment recommendations to other clients or accounts (including accounts which are hedge funds or have performance or higher fees paid to BlackRock, or in which portfolio managers have a personal interest in the receipt of such fees), which may be the same as or different from those made to the Fund. In addition, BlackRock, its affiliates and any officer, director, stockholder or employee may or may not have an interest in the securities whose purchase and sale BlackRock recommends to the Fund. BlackRock, or any of its affiliates, or any officer, director, stockholder, employee or any member of their families may take different actions than those recommended to the Fund by BlackRock with respect to the same securities. Moreover, BlackRock may refrain from rendering any advice or services concerning securities of companies of which any of BlackRock's (or its affiliates') officers, directors or employees are directors or officers, or companies as to which BlackRock or any of its affiliates or the officers, directors and employees of any of them has any substantial economic interest or possesses material non-public information. Each portfolio manager also may manage accounts whose investment strategies may at times be opposed to the strategy utilized for the Fund. In this connection, it should be noted that certain portfolio managers currently manage certain accounts that are subject to performance fees. In addition, certain portfolio managers assist in managing certain hedge funds and may be entitled to receive a portion of any incentive fees earned on such funds and a portion of such incentive fees may be voluntarily or involuntarily deferred. Additional portfolio managers may in the future manage other such accounts or funds and may be entitled to receive incentive fees. As a fiduciary, BlackRock owes a duty of loyalty to its clients and must treat each client fairly. When BlackRock purchases or sells securities for more than one account, the trades must be allocated in a manner consistent with its fiduciary duties. BlackRock attempts to allocate investments in a fair and equitable manner among client accounts, with no account receiving preferential treatment. To this end, BlackRock has adopted a policy that is intended to ensure that investment opportunities are allocated fairly and equitably among client accounts over time. This policy also seeks to achieve reasonable efficiency in client transactions and provide BlackRock with sufficient flexibility to allocate investments in a manner that is consistent with the particular investment discipline and client base. (a)(3) As of February 28, 2007: Portfolio Manager Compensation Compensation Program The elements of total compensation for portfolio managers on BlackRock's municipal team include a fixed base salary, annual performance-based cash and stock compensation (cash and stock bonus) and other benefits. BlackRock has balanced these components of pay to provide these portfolio managers with a powerful incentive to achieve consistently superior investment performance. By design, compensation levels for these portfolio managers fluctuate--both up and down--with the relative investment performance of the portfolios that they manage. Base compensation Like that of many asset management firms, base salaries represent a relatively small portion of a portfolio manager's total compensation. This approach serves to enhance the motivational value of the performance-based (and therefore variable) compensation elements of the compensation program. Performance-Based Compensation BlackRock believes that the best interests of investors are served by recruiting and retaining exceptional asset management talent and managing their compensation within a consistent and disciplined framework that emphasizes pay for performance in the context of an intensely competitive market for talent. To that end, BlackRock and its affiliates portfolio manager incentive compensation is based on a formulaic compensation program. BlackRock's formulaic portfolio manager compensation program includes: investment performance relative to a subset of Florida municipal debt funds over 1-, 3- and 5-year performance periods and a measure of operational efficiency. Portfolio managers are compensated based on the pre-tax performance of the products they manage. If a portfolio manager's tenure is less than 5 years, performance periods will reflect time in position. Portfolio managers are compensated based on products they manage. A discretionary element of portfolio manager compensation may include consideration of: financial results, expense control, profit margins, strategic planning and implementation, quality of client service, market share, corporate reputation, capital allocation, compliance and risk control, leadership, workforce diversity, supervision, technology and innovation. All factors are considered collectively by BlackRock management. Long-Term Retention and Incentive Plan (LTIP) The LTIP is a long-term incentive plan that seeks to reward certain key employees. The plan provides for the grant of awards that are expressed as an amount of cash that, if properly vested and subject to the attainment of certain performance goals, will be settled in cash and/or in BlackRock, Inc. common stock. Cash Bonus Performance-based compensation is distributed to portfolio managers in a combination of cash and stock. Typically, the cash bonus, when combined with base salary, represents more than 60% of total compensation for portfolio managers. Stock Bonus A portion of the dollar value of the total annual performance-based bonus is paid in restricted shares of BlackRock stock. Paying a portion of annual bonuses in stock puts compensation earned by a portfolio manager for a given year "at risk" based on the company's ability to sustain and improve its performance over future periods. The ultimate value of stock bonuses is dependent on future BlackRock stock price performance. As such, the stock bonus aligns each portfolio manager's financial interests with those of the BlackRock shareholders and encourages a balance between short-term goals and long-term strategic objectives. Management strongly believes that providing a significant portion of competitive performance-based compensation in stock is in the best interests of investors and shareholders. This approach ensures that portfolio managers participate as shareholders in both the "downside risk" and "upside opportunity" of the company's performance. Portfolio managers therefore have a direct incentive to protect BlackRock's reputation for integrity. Other Compensation Programs Portfolio managers who meet relative investment performance and financial management objectives during a performance year are eligible to participate in a deferred cash program. Awards under this program are in the form of deferred cash that may be benchmarked to a menu of BlackRock mutual funds (including their own fund) during a five-year vesting period. The deferred cash program aligns the interests of participating portfolio managers with the investment results of BlackRock products and promotes continuity of successful portfolio management teams. Other Benefits Portfolio managers are also eligible to participate in broad-based plans offered generally to employees of BlackRock and its affiliates, including broad-based retirement, 401(k), health, and other employee benefit plans. (a)(4) Beneficial Ownership of Securities. As of February 28, 2007, neither of Messrs. Sneeden, Jaeckel or O'Connor beneficially owns any stock issued by the Fund. Item 9 - Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers - Not Applicable Item 10 - Submission of Matters to a Vote of Security Holders - Not Applicable Item 11 - Controls and Procedures 11(a) - The Registrant's principal executive and principal financial officers have evaluated the Registrant's disclosure controls and procedures, including internal control over financial reporting, within 90 days of this filing. Such principal officers have concluded that as of April, 2007 the Registrant's disclosure controls and procedures were effective in design and operation to reasonably ensure that information required to be disclosed by the Registrant in this Form N-CSR was recorded, processed, summarized, and reported within the required time periods, and were sufficient to form the basis of the certifications required by Rule 30a-2 of the Investment Company Act of 1940, as amended. Prior to reaching that conclusion, such principal officers had become aware of matters relating to the Registrant's participation in certain inverse floater structures that necessitated adjustments to financial information included in Item 1 of this filing. As a result, management of the Registrant had reevaluated certain disclosure controls and procedures determined not to be effective, as discussed more fully below. Management of the Registrant is responsible for establishing and maintaining effective internal control over financial reporting. In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls. The Registrant's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. generally accepted accounting principles. Such internal control includes policies and procedures that provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of a registrant's assets that could have a material effect on the financial statements. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. A control deficiency exists when the design or operation of a control does not allow management or employees, in the normal course of performing their assigned functions, to prevent or detect misstatements on a timely basis. A significant deficiency is a control deficiency, or combination of control deficiencies, that adversely affects the Registrant's ability to initiate, authorize, record, process or report financial data reliably in accordance with generally accepted accounting principles such that there is more than a remote likelihood that a misstatement of the Registrant's annual or interim financial statements that is more than inconsequential will not be prevented or detected. A material weakness is a significant deficiency, or combination of significant deficiencies, that results in more than a remote likelihood that a material misstatement of the annual or interim financial statements will not be prevented or detected. Prior to the filing of the Registrant's Form N-CSR, the Registrant identified the following control deficiency, that was determined to be a material weakness, as defined above, in the Registrant's internal control over financial reporting at February 28, 2007. The Registrant's controls related to the review and analysis of relevant terms and conditions of transfers of certain assets pertaining to inverse floater structures were not operating effectively to appropriately determine whether the transfers of assets qualified for sale accounting under the provisions of Statement of Financial Accounting Standards No. 140, "Accounting for Transfers and Servicing of Financial Assets and Extinguishments of Liabilities" ("SFAS 140"). As a result, these controls did not detect that certain transfers were not appropriately recorded as borrowings. Accordingly, the Registrant's financial statements as of and for the period ended February 28, 2007, including prior periods where applicable, were adjusted prior to being issued to appropriately reflect transfers of such securities as secured borrowings and to report the related income and expense. These adjustments had no impact on net assets, net asset value per share or total return. Prior to the evaluation of the design and operation of the Registrant's disclosure controls and procedures at April, 2007, the Registrant's disclosure controls and procedures were modified to enhance the review and analysis of the relevant terms and conditions of transfers of securities in connection with inverse floater structures in light of SFAS 140. 11(b) - There have been no changes in the Registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940, as amended) that occurred during the second half of the Registrant's fiscal year that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting. However, as discussed above, as of April 2007, the Registrant has enhanced controls related to the application of SFAS 140. Item 12 - Exhibits attached hereto 12(a)(1) - Code of Ethics - Not Applicable to this semi-annual report 12(a)(2) - Certifications - Attached hereto 12(a)(3) - Not Applicable 12(b) - Certifications - Attached hereto Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. BlackRock MuniHoldings Florida Insured Fund By: /s/ Robert C. Doll, Jr. ------------------------------------------- Robert C. Doll, Jr., Chief Executive Officer of BlackRock MuniHoldings Florida Insured Fund Date: April 23, 2007 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: /s/ Robert C. Doll, Jr. ------------------------------------------- Robert C. Doll, Jr., Chief Executive Officer of BlackRock MuniHoldings Florida Insured Fund Date: April 23, 2007 By: /s/ Donald C. Burke ------------------------------------------- Donald C. Burke, Chief Financial Officer of BlackRock MuniHoldings Florida Insured Fund Date: April 23, 2007