UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-Q

        QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT
                               INVESTMENT COMPANY

Investment Company Act File number 811-8573

Name of Fund: MuniHoldings California Insured Fund, Inc.

Fund Address: P.O. Box 9011
              Princeton, NJ 08543-9011

Name and address of agent for service: Robert C. Doll, Jr., Chief Executive
      Officer, MuniHoldings California Insured Fund, Inc., 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: 06/30/2006

Date of reporting period: 01/01/06 - 03/31/06

Item 1 - Schedule of Investments



MuniHoldings California Insured Fund, Inc.
Schedule of Investments as of March 31, 2006                      (in Thousands)



                        Face
                      Amount  Municipal Bonds                                                                               Value
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
California - 155.9%  $ 1,000  ABAG Finance Authority for Nonprofit Corporations, California, COP (Children's
                              Hospital Medical Center), 6% due 12/01/2029 (a)                                             $   1,083
                     --------------------------------------------------------------------------------------------------------------
                       3,345  ABC California Unified School District, GO, Series A, 5.625% due 8/01/2020 (f)(j)               3,500
                     --------------------------------------------------------------------------------------------------------------
                       4,000  Acalanes, California, Unified High School District, GO, 5.80% due 8/01/2007 (f)(i)              4,160
                     --------------------------------------------------------------------------------------------------------------
                      11,960  Alameda County, California, COP (Financing Project), 6% due 9/01/2006 (b)(i)                   12,317
                     --------------------------------------------------------------------------------------------------------------
                       2,490  Alameda County, California, COP, RIB, Series 410, 8.545% due 9/01/2021 (b)(g)                   2,639
                     --------------------------------------------------------------------------------------------------------------
                       7,360  Alhambra, California, Unified School District, GO (Election of 2004), Series A,
                              5% due 8/01/2029 (c)                                                                            7,695
                     --------------------------------------------------------------------------------------------------------------
                       4,535  Bakersfield, California, COP, Refunding (Convention Center Expansion Project),
                              5.875% due 4/01/2007 (b)(i)                                                                     4,687
                     --------------------------------------------------------------------------------------------------------------
                       3,885  Berkeley, California, GO, Series C, 5.375% due 9/01/2029 (c)                                    4,042
                     --------------------------------------------------------------------------------------------------------------
                       1,000  Berkeley, California, Unified School District, GO, Series I, 5.75%
                              due 8/01/2008 (f)(i)                                                                            1,059
                     --------------------------------------------------------------------------------------------------------------
                       1,000  Berkeley, California, Unified School District, GO, Series I, 5.75%
                              due 8/01/2008 (f)(i)                                                                            1,059
                     --------------------------------------------------------------------------------------------------------------
                       4,520  Berkeley, California, Unified School District, GO, Series I, 5.875%
                              due 8/01/2008 (f)(i)                                                                            4,801
                     --------------------------------------------------------------------------------------------------------------
                       7,120  Burbank, California, Unified School District, Capital Appreciation, GO (Election of
                              1997), Series C, 4.84%** due 7/01/2027 (c)                                                      2,595
                     --------------------------------------------------------------------------------------------------------------
                       2,925  Cajon Valley, California, Union School District, GO, Series B, 5.50%
                              due 8/01/2027 (b)                                                                               3,146
                     --------------------------------------------------------------------------------------------------------------
                       2,180  California Community College Financing Authority, Lease Revenue Bonds
                              (Grossmont-Palomar-Shasta), Series A, 5.625% due 4/01/2026 (b)                                  2,356
                     --------------------------------------------------------------------------------------------------------------
                       5,815  California Educational Facilities Authority, Revenue Refunding Bonds (Occidental
                              College), 5.625% due 10/01/2007 (b)(i)                                                          6,110
                     --------------------------------------------------------------------------------------------------------------
                       5,000  California Educational Facilities Authority, Revenue Refunding Bonds (Occidental
                              College), 5.70% due 10/01/2007 (b)(i)                                                           5,259
                     --------------------------------------------------------------------------------------------------------------
                       1,600  California HFA, Home Mortgage Revenue Bonds, VRDN, AMT, Series B,
                              3.12% due 8/01/2033 (f)(h)                                                                      1,600
                     --------------------------------------------------------------------------------------------------------------
                         900  California HFA, Home Mortgage Revenue Bonds, VRDN, Series F,
                              3.12% due 2/01/2033 (a)(h)                                                                        900
                     --------------------------------------------------------------------------------------------------------------
                         265  California HFA, S/F Mortgage Revenue Bonds, AMT, Series A-1, Class II,
                              6% due 8/01/2020 (b)                                                                              273
                     --------------------------------------------------------------------------------------------------------------
                       1,160  California HFA, S/F Mortgage Revenue Bonds, AMT, Series C-2, Class II,
                              5.625% due 8/01/2020 (b)(d)                                                                     1,192
                     --------------------------------------------------------------------------------------------------------------
                       9,250  California Health Facilities Financing Authority Revenue Bonds (Kaiser Permanente),
                              Series A, 5.50% due 6/01/2022 (f)(j)                                                            9,770
                     --------------------------------------------------------------------------------------------------------------
                         660  California Health Facilities Financing Authority, Revenue Refunding Bonds (Catholic
                              Healthcare West), Series A, 6% due 7/01/2006 (b)(i)                                               677
                     --------------------------------------------------------------------------------------------------------------


Portfolio Abbreviations

To simplify the listings of MuniHoldings California Insured Fund, Inc.'s
portfolio holdings in the Schedule of Investments, we have abbreviated the names
of many of the securities according to the list below.

AMT              Alternative Minimum Tax (subject to)
COP              Certificates of Participation
DRIVERS          Derivative Inverse Tax-Exempt Receipts
GO               General Obligation Bonds
HFA              Housing Finance Agency
M/F              Multi-Family
RIB              Residual Interest Bonds
ROLS             Reset Option Long Securities
S/F              Single-Family
VRDN             Variable Rate Demand Notes




MuniHoldings California Insured Fund, Inc.
Schedule of Investments as of March 31, 2006                      (in Thousands)



                        Face
                      Amount  Municipal Bonds                                                                               Value
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
                     $   510  California Health Facilities Financing Authority, Revenue Refunding Bonds (Catholic
                              Healthcare West), Series A, 5.75% due 7/01/2015 (a)                                         $     521
                     --------------------------------------------------------------------------------------------------------------
                       1,840  California Health Facilities Financing Authority, Revenue Refunding Bonds (Catholic
                              Healthcare West), Series A, 6% due 7/01/2025 (b)                                                1,928
                     --------------------------------------------------------------------------------------------------------------
                       4,500  California Health Facilities Financing Authority, Revenue Refunding Bonds
                              (Children's Hospital), 5.375% due 7/01/2020 (b)                                                 4,608
                     --------------------------------------------------------------------------------------------------------------
                       1,900  California Infrastructure and Economic Development Bank Revenue Bonds (Los Angeles
                              County Department of Public Social Services), 5.75% due 9/01/2023 (a)                           2,110
                     --------------------------------------------------------------------------------------------------------------
                       2,000  California State, GO, 5.50% due 6/01/2025 (c)(l)                                                2,124
                     --------------------------------------------------------------------------------------------------------------
                       7,500  California State, GO, 5.25% due 4/01/2027                                                       7,936
                     --------------------------------------------------------------------------------------------------------------
                       6,000  California State, GO, Refunding, 5.25% due 2/01/2026 (b)                                        6,337
                     --------------------------------------------------------------------------------------------------------------
                       1,075  California State, GO, Refunding, 5.75% due 12/01/2029                                           1,151
                     --------------------------------------------------------------------------------------------------------------
                       7,000  California State, GO, Refunding, RIB, AMT, Series 777X, 7.26% due 12/01/2021 (b)(g)             7,376
                     --------------------------------------------------------------------------------------------------------------
                       4,130  California State, GO, Refunding, Veterans, AMT, Series B, 5.45% due 12/01/2017 (b)              4,157
                     --------------------------------------------------------------------------------------------------------------
                      20,000  California State Public Works Board, Lease Revenue Bonds (Various University of
                              California Projects), Series C, 5.125% due 9/01/2022 (a)                                       20,758
                     --------------------------------------------------------------------------------------------------------------
                       5,025  California State Public Works Board, Lease Revenue Refunding Bonds (California State
                              University), Series A, 5.50% due 10/01/2014 (b)                                                 5,172
                     --------------------------------------------------------------------------------------------------------------
                       8,750  California State Public Works Board, Lease Revenue Refunding Bonds (Department of
                              Corrections), Series B, 5.625% due 11/01/2019 (b)                                               9,026
                     --------------------------------------------------------------------------------------------------------------
                       2,625  California State Public Works Board, Lease Revenue Refunding Bonds (Various
                              Community College Project), Series B, 5.625% due 3/01/2019 (a)                                  2,682
                     --------------------------------------------------------------------------------------------------------------
                       2,935  California State, Various Purpose, GO, 5% due 3/01/2033 (b)                                     3,042
                     --------------------------------------------------------------------------------------------------------------
                       7,050  California State, Various Purpose, GO, 5.50% due 11/01/2033                                     7,652
                     --------------------------------------------------------------------------------------------------------------
                       8,965  California State, Various Purpose, GO, Refunding, 5% due 3/01/2027                              9,291
                     --------------------------------------------------------------------------------------------------------------
                       9,500  California Statewide Communities Development Authority, COP, Refunding (Huntington
                              Memorial Hospital), 5.80% due 7/01/2006 (e)(i)                                                  9,743
                     --------------------------------------------------------------------------------------------------------------
                       4,915  California Statewide Communities Development Authority, Health Facility Revenue
                              Bonds (Memorial Health Services), Series A, 6% due 10/01/2023                                   5,391
                     --------------------------------------------------------------------------------------------------------------
                       1,090  California Statewide Communities Development Authority Revenue Bonds (Los Angeles
                              Orthopedic Hospital Foundation), 5.50% due 6/01/2019 (a)                                        1,123
                     --------------------------------------------------------------------------------------------------------------
                      16,770  Capistrano, California, Unified Public Financing Authority, Special Tax Revenue
                              Refunding Bonds, First Lien, Series A, 5.70% due 9/01/2016 (a)                                 17,246
                     --------------------------------------------------------------------------------------------------------------
                      10,640  Capistrano, California, Unified Public Financing Authority, Special Tax Revenue
                              Refunding Bonds, First Lien, Series A, 5.70% due 9/01/2020 (a)                                 10,943
                     --------------------------------------------------------------------------------------------------------------
                       8,705  Castaic Lake, California, Water Agency Revenue Bonds, COP (Water System Improvement
                              Project), 5.50% due 8/01/2023 (a)                                                               9,229
                     --------------------------------------------------------------------------------------------------------------
                       2,500  Colton, California, Joint Unified School District, GO, Series A, 5.375%
                              due 8/01/2026 (c)                                                                               2,693
                     --------------------------------------------------------------------------------------------------------------
                       7,800  Contra Costa, California, Community College District, GO (Election of 2002),
                              5% due 8/01/2028 (b)                                                                            8,118
                     --------------------------------------------------------------------------------------------------------------
                       4,570  Contra Costa County, California, COP, Refunding (Capital Projects Program),
                              5.25% due 2/01/2021 (a)                                                                         4,714
                     --------------------------------------------------------------------------------------------------------------
                       6,000  Contra Costa County, California, COP, Refunding, DRIVERS, Series 154, 7.264%
                              due 11/01/2017 (b)(g)                                                                           6,538
                     --------------------------------------------------------------------------------------------------------------
                       2,000  Contra Costa County, California, COP, Refunding (Merrithew Memorial Hospital
                              Project), 5.50% due 11/01/2022 (b)                                                              2,091
                     --------------------------------------------------------------------------------------------------------------




MuniHoldings California Insured Fund, Inc.
Schedule of Investments as of March 31, 2006                      (in Thousands)



                        Face
                      Amount  Municipal Bonds                                                                               Value
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
                     $ 5,910  Corona, California, Department of Water and Power, COP, 5% due 9/01/2029 (b)                $   6,135
                     --------------------------------------------------------------------------------------------------------------
                       4,250  Coronado, California, Community Development Agency, Tax Allocation Bonds (Coronado
                              Community Development Project), 5% due 9/01/2030 (a)                                            4,398
                     --------------------------------------------------------------------------------------------------------------
                       2,395  Covina-Valley, California, Unified School District, GO, Refunding, Series A,
                              5.50% due 8/01/2026 (f)                                                                         2,593
                     --------------------------------------------------------------------------------------------------------------
                       3,750  Culver City, California, Redevelopment Finance Authority, Revenue Refunding Bonds,
                              Tax Allocation, Series A, 5.60% due 11/01/2025 (f)                                              4,029
                     --------------------------------------------------------------------------------------------------------------
                       1,870  Davis, California, Joint Unified School District, Community Facilities District,
                              Special Tax Refunding Bonds, Number 1, 5.50% due 8/15/2021 (b)                                  1,901
                     --------------------------------------------------------------------------------------------------------------
                       1,000  Delano, California, Union Elementary School District, GO (Election of 2000),
                              Series F, 5% due 2/01/2033 (f)                                                                  1,042
                     --------------------------------------------------------------------------------------------------------------
                       7,500  Desert Sands, California, Unified School District, GO (Election of 2001),
                              5% due 6/01/2029 (f)                                                                            7,806
                     --------------------------------------------------------------------------------------------------------------
                       5,205  East Side Union High School District, California, Santa Clara County, Capital
                              Appreciation, GO (Election of 2002), Series E, 5.03%** due 8/01/2024 (k)                        2,105
                     --------------------------------------------------------------------------------------------------------------
                      11,000  East Side Union High School District, California, Santa Clara County, Capital
                              Appreciation, GO (Election of 2002), Series E, 5.125%** due 8/01/2028 (k)                       3,567
                     --------------------------------------------------------------------------------------------------------------
                       1,000  Escondido, California, COP, Refunding, Series A, 5.75% due 9/01/2024 (c)                        1,084
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Escondido, California, COP, Refunding (Wastewater Project), 5.70% due 9/01/2006 (a)(i)          5,146
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Fontana, California, Redevelopment Agency, Tax Allocation Refunding Bonds (Southwest
                              Industrial Park Project), 5% due 9/01/2022 (b)                                                  5,181
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Foothill-De Anza, California, Community College District, GO, Refunding,
                              5% due 8/01/2030 (c)                                                                            5,156
                     --------------------------------------------------------------------------------------------------------------
                       4,455  Fresno, California, Airport Revenue Bonds, AMT, Series B, 5.50% due 7/01/2020 (f)               4,710
                     --------------------------------------------------------------------------------------------------------------
                       5,200  Fullerton, California, Joint Union High School District, GO (Election of 2002),
                              Series B, 5% due 8/01/2029 (c)                                                                  5,432
                     --------------------------------------------------------------------------------------------------------------
                       4,040  Garden Grove, California, COP (Financing Project), Series A, 5.50% due 3/01/2026 (a)            4,356
                     --------------------------------------------------------------------------------------------------------------
                       5,200  Glendale, California, Unified School District, GO, Series B, 5.125% due 9/01/2023 (f)           5,407
                     --------------------------------------------------------------------------------------------------------------
                       4,565  Hemet, California, Unified School District, GO, Series A, 5.375% due 8/01/2026 (b)              4,868
                     --------------------------------------------------------------------------------------------------------------
                       9,205  Industry, California, Urban Development Agency, Tax Allocation Refunding Bonds
                              (Civic-Recreational-Industrial Redevelopment Project Number 1), 5.50% due 5/01/2020 (b)         9,526
                     --------------------------------------------------------------------------------------------------------------
                       1,700  Inglewood, California, Unified School District, GO, Series A, 5.60% due 10/01/2024 (c)          1,818
                     --------------------------------------------------------------------------------------------------------------
                       2,300  Irvine, California, Unified School District, Special Tax (Community Facilities
                              District Number 86-1), 5.375% due 11/01/2020 (a)                                                2,437
                     --------------------------------------------------------------------------------------------------------------
                       4,665  Irvine, California, Unified School District, Special Tax Refunding Bonds (Community
                              Facilities District Number 86-1), 5.80% due 11/01/2020 (a)                                      4,914
                     --------------------------------------------------------------------------------------------------------------
                       2,500  La Quinta, California, Financing Authority, Local Agency Revenue Bonds, Series A,
                              5.25% due 9/01/2024 (a)                                                                         2,675
                     --------------------------------------------------------------------------------------------------------------
                       3,585  La Quinta, California, Financing Authority, Local Agency Tax Allocation and Revenue
                              Refunding Bonds, ROLS, Series II-R-412X, 6.961% due 9/01/2034 (a)(g)                            3,906
                     --------------------------------------------------------------------------------------------------------------
                       4,000  Long Beach, California, Bond Finance Authority, Lease Revenue Bonds (Rainbow Harbor
                              Refinancing Project), Series A, 5.25% due 5/01/2009 (a)(i)                                      4,199
                     --------------------------------------------------------------------------------------------------------------
                      10,000  Los Angeles, California, Community Redevelopment Agency, Community Redevelopment
                              Financing Authority Revenue Bonds (Bunker Hill Project), Series A, 5% due 12/01/2027 (f)       10,362
                     --------------------------------------------------------------------------------------------------------------
                       2,000  Los Angeles, California, Harbor Department Revenue Bonds, AMT, Series B,
                              5.375% due 11/01/2023                                                                           2,035
                     --------------------------------------------------------------------------------------------------------------




MuniHoldings California Insured Fund, Inc.
Schedule of Investments as of March 31, 2006                      (in Thousands)



                        Face
                      Amount  Municipal Bonds                                                                               Value
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
                     $   240  Los Angeles, California, M/F Housing Revenue Refunding Bonds, Senior Series G,
                              5.65% due 1/01/2014 (f)                                                                     $     241
                     --------------------------------------------------------------------------------------------------------------
                      10,000  Los Angeles, California, Unified School District, GO, Series E, 5% due 7/01/2030 (a)           10,436
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Los Angeles, California, Water and Power Revenue Bonds (Power System),
                              Sub-Series A-1, 5% due 7/01/2031 (f)                                                            5,214
                     --------------------------------------------------------------------------------------------------------------
                       9,000  Los Angeles County, California, Metropolitan Transportation Authority, Sales Tax
                              Revenue Refunding Bonds, Proposition A, First Tier Senior-Series A, 5% due 7/01/2035 (a)        9,378
                     --------------------------------------------------------------------------------------------------------------
                       3,750  Los Angeles County, California, Metropolitan Transportation Authority, Sales Tax
                              Revenue Refunding Bonds, Proposition C, Second Tier Senior-Series A,
                              5.25% due 7/01/2030 (c)                                                                         3,962
                     --------------------------------------------------------------------------------------------------------------
                       8,795  Los Angeles County, California, Sanitation Districts Financing Authority, Revenue
                              Refunding Bonds (Capital Projects - District Number 14), Sub-Series B,
                              5% due 10/01/2034 (c)                                                                           9,153
                     --------------------------------------------------------------------------------------------------------------
                       2,735  Los Gatos, California, Unified School District, GO (Election 2001), Series B,
                              5% due 8/01/2030 (f)                                                                            2,832
                     --------------------------------------------------------------------------------------------------------------
                       1,890  Los Rios, California, Community College District, GO (Election of 2002), Series B,
                              5% due 8/01/2027 (b)                                                                            1,963
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Menlo Park, California, Community Development Agency, Tax Allocation (Las Pulgas
                              Community Development Project), 5.50% due 6/01/2025 (a)                                         5,378
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Merced, California, Irrigation District, Electrical System Revenue Refunding Bonds,
                              5.25% due 9/01/2036 (k)                                                                         5,301
                     --------------------------------------------------------------------------------------------------------------
                       3,550  Metropolitan Water District of Southern California, Waterworks Revenue Bonds,
                              Series A, 5% due 7/01/2035 (f)                                                                  3,699
                     --------------------------------------------------------------------------------------------------------------
                       9,000  Metropolitan Water District of Southern California, Waterworks Revenue Bonds,
                              Series B-1, 5% due 10/01/2033 (c)                                                               9,307
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Modesto, California, Schools Infrastructure Financing Agency, Special Tax Bonds,
                              5% due 9/01/2029 (a)                                                                            5,180
                     --------------------------------------------------------------------------------------------------------------
                       3,500  Mojave, California, Water Agency, GO, Refunding (Improvement District - Morongo
                              Basin), 5.80% due 9/01/2022 (c)                                                                 3,602
                     --------------------------------------------------------------------------------------------------------------
                       2,000  Montebello, California, Community Redevelopment Agency, Housing Tax Allocation Bonds,
                              Series A, 5.45% due 9/01/2019 (f)                                                               2,088
                     --------------------------------------------------------------------------------------------------------------
                       4,150  Moorpark, California, Redevelopment Agency, Tax Allocation Bonds (Moorpark
                              Redevelopment Project), 5.125% due 10/01/2031 (a)                                               4,338
                     --------------------------------------------------------------------------------------------------------------
                       2,315  Morgan Hill, California, Unified School District, GO, 5.75% due 8/01/2019 (c)                   2,521
                     --------------------------------------------------------------------------------------------------------------
                       2,140  North City West, California, School Facilities Financing Authority, Special Tax
                              Refunding Bonds, Series B, 6% due 9/01/2019 (f)                                                 2,204
                     --------------------------------------------------------------------------------------------------------------
                       3,275  Northern California Power Agency, Public Power Revenue Refunding Bonds (Hydroelectric
                              Project Number One), Series A, 5.125% due 7/01/2023 (b)                                         3,393
                     --------------------------------------------------------------------------------------------------------------
                       9,995  Oakland, California, Alameda County Unified School District, GO, Refunding,
                              Series C, 5.50% due 8/01/2019 (c)                                                              10,059
                     --------------------------------------------------------------------------------------------------------------
                       3,705  Oakland, California, Alameda County Unified School District, GO, Series F,
                              5.625% due 8/01/2020 (b)                                                                        3,980
                     --------------------------------------------------------------------------------------------------------------
                       5,245  Oakland, California, Alameda County Unified School District, GO, Series F,
                              5.625% due 8/01/2021 (b)                                                                        5,621
                     --------------------------------------------------------------------------------------------------------------




MuniHoldings California Insured Fund, Inc.
Schedule of Investments as of March 31, 2006                      (in Thousands)



                        Face
                      Amount  Municipal Bonds                                                                               Value
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
                     $ 6,000  Oakland, California, Alameda County Unified School District, GO, Series F,
                              5.50% due 8/01/2024 (b)                                                                     $   6,388
                     --------------------------------------------------------------------------------------------------------------
                       7,105  Oakland, California, Joint Powers Financing Authority, Lease Revenue Bonds (Oakland
                              Administration Buildings), 5.75% due 8/01/2006 (a)(i)                                           7,300
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Ohlone, California, Community College District, GO, Series B, 5% due 8/01/2030 (f)              5,220
                     --------------------------------------------------------------------------------------------------------------
                      10,000  Oxnard, California, Financing Authority, Wastewater Revenue Bonds (Redwood Trunk
                              Sewer and Headworks Projects), Series A, 5.25% due 6/01/2034 (c)                               10,610
                     --------------------------------------------------------------------------------------------------------------
                       6,475  Palm Desert, California, Financing Authority, Tax Allocation Revenue Bonds (Project
                              Area Number 2), 5% due 8/01/2033 (b)                                                            6,709
                     --------------------------------------------------------------------------------------------------------------
                       5,750  Palm Desert, California, Financing Authority, Tax Allocation Revenue Refunding Bonds
                              (Project Area Number 1), 5.45% due 4/01/2018 (b)                                                5,961
                     --------------------------------------------------------------------------------------------------------------
                       1,000  Palm Springs, California, COP, Refunding (Multiple Capital Facilities Project),
                              5.75% due 4/01/2017 (a)                                                                         1,040
                     --------------------------------------------------------------------------------------------------------------
                       1,600  Palm Springs, California, Financing Authority, Lease Revenue Refunding Bonds
                              (Convention Center Project), Series A, 5.50% due 11/01/2035 (b)                                 1,755
                     --------------------------------------------------------------------------------------------------------------
                       7,745  Peralta, California, Community College District, GO, RIB, Series 1264-X,
                              6.60% due 8/01/2035 (f)(g)                                                                      8,365
                     --------------------------------------------------------------------------------------------------------------
                       5,115  Perris, California, Unified School District, Capital Appreciation, GO, Series A,
                              5.20%** due 9/01/2028 (c)                                                                       1,755
                     --------------------------------------------------------------------------------------------------------------
                       4,000  Pittsburg, California, Public Financing Authority, Water Revenue Bonds,
                              5.50% due 6/01/2007 (b)(i)                                                                      4,170
                     --------------------------------------------------------------------------------------------------------------
                       9,100  Pleasanton, California, Unified School District, GO, Series E, 5.50%
                              due 8/01/2008 (c)(i)                                                                            9,594
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Port of Oakland, California, Port Revenue Refunding Bonds, Series I,
                              5.40% due 11/01/2017 (b)                                                                        5,233
                     --------------------------------------------------------------------------------------------------------------
                      12,675  Port of Oakland, California, RIB, AMT, Series 1192, 7.31% due 11/01/2027 (c)(g)                14,197
                     --------------------------------------------------------------------------------------------------------------
                       3,500  Port of Oakland, California, Revenue Bonds, AMT, Series K, 5.75% due 11/01/2014 (c)             3,736
                     --------------------------------------------------------------------------------------------------------------
                      17,120  Port of Oakland, California, Revenue Bonds, AMT, Series K, 5.75% due 11/01/2029 (c)            18,178
                     --------------------------------------------------------------------------------------------------------------
                       5,085  Rancho Cordova, California, COP (City Hall Facility Acquisition Project),
                              5% due 2/01/2030 (k)                                                                            5,268
                     --------------------------------------------------------------------------------------------------------------
                       2,205  Richmond, California, Joint Powers Financing Authority, Tax Allocation Revenue Bonds,
                              Series A, 5.50% due 9/01/2018 (b)                                                               2,368
                     --------------------------------------------------------------------------------------------------------------
                       8,775  Sacramento, California, City Financing Authority, Revenue Refunding Bonds,
                              5% due 12/01/2029 (c)                                                                           9,115
                     --------------------------------------------------------------------------------------------------------------
                      10,825  Sacramento, California, Municipal Utility District, Electric Revenue Refunding Bonds,
                              Series L, 5.125% due 7/01/2022 (b)                                                             11,213
                     --------------------------------------------------------------------------------------------------------------
                       2,500  Sacramento, California, Municipal Utility District Financing Authority, Revenue Bonds
                              (Consumers Project), 5.125% due 7/01/2029 (b)                                                   2,650
                     --------------------------------------------------------------------------------------------------------------
                      17,130  Sacramento, California, Municipal Utility District Financing Authority, Revenue Bonds,
                              DRIVERS, Series 1237Z, 6.774% due 1/01/2014 (b)(g)                                             19,188
                     --------------------------------------------------------------------------------------------------------------
                       3,500  Sacramento, California, Power Authority Revenue Bonds (Cogeneration Project),
                              5.875% due 7/01/2006 (b)(i)                                                                     3,590
                     --------------------------------------------------------------------------------------------------------------
                       1,700  Sacramento County, California, Airport System Revenue Bonds, Series A,
                              5.25% due 7/01/2017 (f)                                                                         1,815
                     --------------------------------------------------------------------------------------------------------------
                       4,000  Sacramento County, California, Sanitation District Financing Authority, Revenue Bonds,
                              Series A, 5% due 12/01/2035 (a)                                                                 4,159
                     --------------------------------------------------------------------------------------------------------------
                       4,000  Sacramento County, California, Sanitation District Financing Authority, Revenue
                              Refunding Bonds, 5% due 8/01/2030 (b)                                                           4,176
                     --------------------------------------------------------------------------------------------------------------




MuniHoldings California Insured Fund, Inc.
Schedule of Investments as of March 31, 2006                      (in Thousands)



                        Face
                      Amount  Municipal Bonds                                                                               Value
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
                     $ 4,115  Saddleback Valley, California, Unified School District, GO, 5% due 8/01/2029 (f)            $   4,285
                     --------------------------------------------------------------------------------------------------------------
                       5,440  San Bernardino, California, Joint Powers Financing Authority, Lease Revenue Bonds
                              (Department of Transportation Lease), Series A, 5.50% due 12/01/2020 (b)                        5,557
                     --------------------------------------------------------------------------------------------------------------
                       1,480  San Bernardino County, California, COP, Refunding (Medical Center Financing Project),
                              5.50% due 8/01/2019 (b)                                                                         1,489
                     --------------------------------------------------------------------------------------------------------------
                       3,330  San Diego, California, Community College District, GO (Election of 2002),
                               5% due 5/01/2030 (f)                                                                           3,473
                     --------------------------------------------------------------------------------------------------------------
                       5,055  San Diego, California, Public Facilities Financing Authority, Sewer Revenue Bonds,
                              Series A, 5.25% due 5/15/2027 (c)                                                               5,184
                     --------------------------------------------------------------------------------------------------------------
                       6,480  San Diego, California, Unified School District, GO (Election of 1998), Series F,
                              5% due 7/01/2028 (f)                                                                            6,742
                     --------------------------------------------------------------------------------------------------------------
                       1,500  San Diego County, California, COP (Edgemoor Project and Regional System), Refunding,
                              5% due 2/01/2029 (a)                                                                            1,554
                     --------------------------------------------------------------------------------------------------------------
                       4,000  San Diego County, California, Water Authority, Water Revenue Bonds, COP, Series A,
                              5% due 5/01/2031 (f)                                                                            4,154
                     --------------------------------------------------------------------------------------------------------------
                      10,000  San Diego County, California, Water Authority, Water Revenue Refunding Bonds, COP,
                              Series A, 5% due 5/01/2032 (b)                                                                 10,320
                     --------------------------------------------------------------------------------------------------------------
                       6,795  San Francisco, California, Bay Area Rapid Transit District, Sales Tax Revenue Bonds,
                              5.50% due 7/01/2009 (c)(i)                                                                      7,259
                     --------------------------------------------------------------------------------------------------------------
                      13,100  San Francisco, California, Bay Area Rapid Transit District, Sales Tax Revenue
                              Refunding Bonds, Series A, 5% due 7/01/2030 (b)                                                13,671
                     --------------------------------------------------------------------------------------------------------------
                       6,430  San Francisco, California, City and County Airport Commission, International Airport
                              Revenue Bonds, AMT, Second Series, Issue 24A, 5.50% due 5/01/2024 (f)                           6,745
                     --------------------------------------------------------------------------------------------------------------
                       6,750  San Francisco, California, City and County Public Utilities Commission, Water
                              Revenue Refunding Bonds, RIB, Series 1259-X, 6.60% due 11/01/2032 (b)(g)                        7,132
                     --------------------------------------------------------------------------------------------------------------
                       8,900  San Francisco, California, State Building Authority, Lease Revenue Bonds (San
                              Francisco Civic Center Complex), Series A, 5.25% due 12/01/2006 (a)(i)                          9,181
                     --------------------------------------------------------------------------------------------------------------
                       7,400  San Jose, California, Financing Authority, Lease Revenue Refunding Bonds, DRIVERS,
                              Series 1280Z, 6.525% due 12/01/2010 (a)(g)                                                      7,787
                     --------------------------------------------------------------------------------------------------------------
                      10,410  San Jose-Evergreen, California, Community College District, Capital Appreciation, GO
                              (Election of 2004), Refunding, Series A, 5.17%** due 9/01/2024 (b)                              4,130
                     --------------------------------------------------------------------------------------------------------------
                       7,250  San Jose-Evergreen, California, Community College District, Capital Appreciation, GO
                              (Election of 2004), Refunding, Series A, 5.34%** due 9/01/2029 (b)                              2,171
                     --------------------------------------------------------------------------------------------------------------
                       3,955  San Juan, California, Unified School District, GO, 5.625% due 8/01/2018 (c)                     4,282
                     --------------------------------------------------------------------------------------------------------------
                       3,830  San Juan, California, Unified School District, GO, 5.625% due 8/01/2019 (c)                     4,147
                     --------------------------------------------------------------------------------------------------------------
                       4,250  San Juan, California, Unified School District, GO (Election of 2002),
                              5% due 8/01/2028 (b)                                                                            4,405
                     --------------------------------------------------------------------------------------------------------------
                       2,300  San Mateo County, California, Community College District, COP, 5% due 10/01/2029 (b)            2,380
                     --------------------------------------------------------------------------------------------------------------
                       5,650  San Mateo County, California, Transit District, Sales Tax Revenue Refunding Bonds,
                              Series A, 5% due 6/01/2029 (b)                                                                  5,903
                     --------------------------------------------------------------------------------------------------------------
                      14,000  Santa Clara, California, Redevelopment Agency, Tax Allocation Bonds (Bayshore North
                              Project), Series A, 5.50% due 6/01/2023 (a)                                                    14,836
                     --------------------------------------------------------------------------------------------------------------
                       6,050  Santa Clara, California, Subordinated Electric Revenue Bonds, Series A,
                              5% due 7/01/2028 (b)                                                                            6,269
                     --------------------------------------------------------------------------------------------------------------
                       9,750  Santa Clara County, California, Financing Authority, Lease Revenue Refunding Bonds,
                              Series A, 5% due 11/15/2022 (a)                                                                10,125
                     --------------------------------------------------------------------------------------------------------------




MuniHoldings California Insured Fund, Inc.
Schedule of Investments as of March 31, 2006                      (in Thousands)



                        Face
                      Amount  Municipal Bonds                                                                               Value
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
                     $ 9,000  Santa Fe Springs, California, Community Development, Commission Tax Allocation
                              Refunding Bonds (Consolidated Redevelopment Project), Series A, 5% due 9/01/2022 (b)        $   9,306
                     --------------------------------------------------------------------------------------------------------------
                       5,110  Santa Monica, California, Redevelopment Agency, Tax Allocation Bonds (Earthquake
                              Recovery Redevelopment Project), 6% due 7/01/2009 (a)(i)                                        5,492
                     --------------------------------------------------------------------------------------------------------------
                       2,855  Santa Rosa, California, High School District, GO (Election of 2002),
                              5% due 8/01/2028 (b)                                                                            2,959
                     --------------------------------------------------------------------------------------------------------------
                       4,450  Saugus, California, Union School District, GO, Series B, 5% due 8/01/2029 (f)                   4,649
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Southern California Public Power Authority, Power Project Revenue Bonds (Magnolia
                              Power Project), Series A-1, 5% due 7/01/2033 (a)                                                5,165
                     --------------------------------------------------------------------------------------------------------------
                       1,570  Southwestern Community College District, California, GO, Refunding,
                              5.25% due 8/01/2017 (b)                                                                         1,732
                     --------------------------------------------------------------------------------------------------------------
                       3,200  Stockton, California, Public Financing Authority, Water Revenue Bonds (Water System
                              Capital Improvement Projects), Series A, 5% due 10/01/2031 (b)                                  3,335
                     --------------------------------------------------------------------------------------------------------------
                       1,500  Stockton, California, Redevelopment Agency, Revenue Bonds (Stockton Events Center -
                              Arena Project), 5% due 9/01/2028 (c)                                                            1,550
                     --------------------------------------------------------------------------------------------------------------
                      13,250  Tracy, California, Area Public Facilities Financing Agency, Special Tax Refunding
                              Bonds (Community Facilities District Number 87-1), Series H, 5.875% due 10/01/2019 (b)         13,775
                     --------------------------------------------------------------------------------------------------------------
                       6,655  Turlock, California, Public Finance Authority, Sewer Revenue Bonds, Series A,
                              5% due 9/15/2033 (c)                                                                            6,876
                     --------------------------------------------------------------------------------------------------------------
                       7,475  University of California, COP, Series A, 5.25% due 11/01/2007 (a)(i)                            7,752
                     --------------------------------------------------------------------------------------------------------------
                       9,875  University of California, Hospital Revenue Bonds (University of California Medical
                              Center), 5.75% due 7/01/2006 (a)(i)                                                            10,028
                     --------------------------------------------------------------------------------------------------------------
                       8,700  University of California Revenue Bonds, ROLS, Series II-R-524,
                              6.718% due 5/15/2033 (f)(g)                                                                     9,334
                     --------------------------------------------------------------------------------------------------------------
                       1,410  University of California Revenue Bonds, Series K, 5.25% due 9/01/2024 (c)(l)                    1,470
                     --------------------------------------------------------------------------------------------------------------
                      16,000  University of California, Revenue Refunding Bonds (Multiple Purpose Projects),
                              Series E, 5.125% due 9/01/2020 (b)                                                             16,470
                     --------------------------------------------------------------------------------------------------------------
                      10,000  Vista, California, Unified School District, GO, Series A, 5.25% due 8/01/2025 (f)              10,601
                     --------------------------------------------------------------------------------------------------------------
                       2,550  Vista, California, Unified School District, GO, Series B, 5% due 8/01/2028 (c)                  2,643
                     --------------------------------------------------------------------------------------------------------------
                       6,075  Washington, California, Unified School District (Yolo County), Capital Appreciation,
                              GO (Election of 2004), Series A, 4.98%** due 8/01/2029 (c)                                      1,994
                     --------------------------------------------------------------------------------------------------------------
                       5,825  West Contra Costa, California, Unified School District, Capital Appreciation, GO
                              (Election of 2002), Series C, 4.98%** due 8/01/2029 (c)                                         1,895
                     --------------------------------------------------------------------------------------------------------------
                       6,690  West Contra Costa, California, Unified School District, GO (Election of 2002),
                              Series B, 5% due 8/01/2032 (f)                                                                  6,890
                     --------------------------------------------------------------------------------------------------------------
                       5,000  Woodland, California, Financing Authority, Lease Revenue Bonds (Capital Projects),
                              5% due 3/01/2026 (f)                                                                            5,178
                     --------------------------------------------------------------------------------------------------------------
                       3,145  Yorba Linda, California, Redevelopment Agency, Redevelopment Project Tax Allocation
                              Revenue Bonds (Subordinate Lien), Series B, 5% due 9/01/2032 (a)                                3,274
-----------------------------------------------------------------------------------------------------------------------------------
Puerto Rico - 4.7%    15,000  Puerto Rico Commonwealth Infrastructure Financing Authority, Special Tax and Capital
                              Appreciation Revenue Bonds, Series A, 4.60%** due 7/01/2030 (c)                                 4,778
                     --------------------------------------------------------------------------------------------------------------
                      12,400  Puerto Rico Commonwealth Infrastructure Financing Authority, Special Tax and Capital
                              Appreciation Revenue Bonds, Series A, 4.77%** due 7/01/2042 (c)                                 2,146
                     --------------------------------------------------------------------------------------------------------------
                      10,000  Puerto Rico Commonwealth Infrastructure Financing Authority, Special Tax and Capital
                              Appreciation Revenue Bonds, Series A, 4.77%** due 7/01/2044 (a)                                 1,567
                     --------------------------------------------------------------------------------------------------------------
                      11,215  Puerto Rico Electric Power Authority, Power Revenue Bonds, Series HH,
                              5.30% due 7/01/2020 (f)                                                                        11,916
                     --------------------------------------------------------------------------------------------------------------
                       7,880  Puerto Rico Electric Power Authority, Power Revenue Bonds, Series NN,
                              5.125% due 7/01/2029                                                                            8,157
-----------------------------------------------------------------------------------------------------------------------------------
                              Total Municipal Bonds (Cost - $933,148) - 160.6%                                              969,124
-----------------------------------------------------------------------------------------------------------------------------------




MuniHoldings California Insured Fund, Inc.
Schedule of Investments as of March 31, 2006                      (in Thousands)



                      Shares
                        Held  Short-Term Securities                                                                        Value
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
                          93  CMA California Municipal Money Fund (m)                                                     $      93
-----------------------------------------------------------------------------------------------------------------------------------
                              Total Short-Term Securities (Cost - $93) - 0.0%                                                    93
-----------------------------------------------------------------------------------------------------------------------------------
                              Total Investments (Cost - $933,241*) - 160.6%                                                 969,217

                              Other Assets Less Liabilities - 4.1%                                                           24,414

                              Preferred Stock, at Redemption Value - (64.7%)                                               (390,206)
                                                                                                                          ---------
                              Net Assets Applicable to Common Stock - 100.0%                                              $ 603,425
                                                                                                                          =========


*     The cost and unrealized appreciation (depreciation) of investments as of
      March 31, 2006, as computed for federal income tax purposes, were as
      follows:

      Aggregate cost                                                  $ 933,250
                                                                      =========
      Gross unrealized appreciation                                   $  38,139
      Gross unrealized depreciation                                      (2,172)
                                                                      ---------
      Net unrealized appreciation                                     $  35,967
                                                                      =========

**    Represents a zero coupon bond; the interest rate shown reflects the
      effective yield at the time of purchase.
(a)   AMBAC Insured.
(b)   MBIA Insured.
(c)   FGIC Insured.
(d)   FHA Insured.
(e)   Connie Lee Insured.
(f)   FSA Insured.
(g)   The rate disclosed is that currently in effect. This rate changes
      periodically and inversely based upon prevailing market rates.
(h)   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.
(i)   Prerefunded.
(j)   Escrowed to maturity.
(k)   XL Capital Insured.
(l)   Tradable Custodial Receipts (TRACERS).
(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:

      --------------------------------------------------------------------------
      Affiliate                                 Net Activity     Dividend Income
      --------------------------------------------------------------------------
      CMA California Municipal Money Fund            38               $33
      --------------------------------------------------------------------------


Item 2 - Controls and Procedures

2(a) - The registrant's certifying officers have reasonably designed such
       disclosure controls and procedures to ensure material information
       relating to the registrant is made known to us by others particularly
       during the period in which this report is being prepared. The
       registrant's certifying officers have determined that the registrant's
       disclosure controls and procedures are effective based on our evaluation
       of these controls and procedures as of a date within 90 days prior to the
       filing date of this report.

2(b) - There were no changes in the registrant's internal control over financial
       reporting (as defined in Rule 30a-3(d) under the Act (17 CFR
       270.30a-3(d)) that occurred during the last fiscal quarter of the period
       covered by this report that has materially affected, or is reasonably
       likely to materially affect, the registrant's internal control over
       financial reporting.

Item 3 - Exhibits

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.

MuniHoldings California Insured Fund, Inc.


By: /s/ Robert C. Doll, Jr.
    ------------------------------------------
    Robert C. Doll, Jr.
    Chief Executive Officer
    MuniHoldings California Insured Fund, Inc.

Date: May 22, 2006

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
    MuniHoldings California Insured Fund, Inc.

Date: May 22, 2006


By: /s/ Donald C. Burke
    ------------------------------------------
    Donald C. Burke
    Chief Financial Officer
    MuniHoldings California Insured Fund, Inc.

Date: May 22, 2006