Filing Pursuant to Rule 424(b)(3) Registration Statement No. 333-48536 PROSPECTUS SUPPLEMENT NO. 9 DATED APRIL 27, 2001 TO PROSPECTUS DATED JANUARY 22, 2001 TERAYON COMMUNICATION SYSTEMS, INC. $500,000.00 of 5% Convertible Subordinated Notes Due 2007 and 5,951,673 Shares of Common Stock Issuable Upon Conversion of the Notes Please read this prospectus supplement in conjunction with the prospectus dated January 22, 2001 (the "Prospectus"). The table on pages 21 through 24 of the Prospectus setting forth information concerning the selling holders, the prospectus supplement no. 1 dated February 9, 2001, the prospectus supplement no. 2 dated February 16, 2001, the prospectus supplement No. 3 dated February 20, 2001, the prospectus supplement no. 4 dated February 23, 2001, the prospectus supplement no. 5 dated March 2, 2001, the prospectus supplement No. 6 dated March 16, 2001, the prospectus supplement no. 7 dated March 16, 2001 and the prospectus supplement no. 8 dated March 23, 2001 are superseded by the following table: SELLING HOLDERS We originally issued the Notes and the Notes were sold by the initial purchasers in a transaction exempt from the registration requirements of the Securities Act to persons reasonably believed by the initial purchasers to be qualified institutional buyers or other institutional accredited investors. Selling holders, including their transferees, pledgees or donees or their successors, may from time to time offer and sell pursuant to this prospectus any or all of the Notes and common stock into which the Notes are convertible. We agreed to use reasonable efforts to keep the registration statement effective until July 26, 2002. Our registration of the Notes and the shares of common stock into which the Notes are convertible does not necessarily mean that the selling holders will sell any or all of the Notes or the shares of the common stock into which the Notes are convertible. The following table sets forth information, as of April 27, 2001, with respect to the selling holders and the principal amounts of Notes beneficially owned by each selling holder that may be offered under this prospectus. The information is based on information provided by or on behalf of the selling holders. The selling holders may offer all, some or none of the Notes or common stock into which the Notes are convertible. Because the selling holders may offer all or some portion of the Notes or the common stock, no estimate can be given as to the amount of the Notes or the common stock that will be held by the selling holders upon termination of any sales. In addition, the selling holders identified below may have sold, transferred or otherwise disposed of all or a portion of their Notes since the date on which they provided the information regarding their Notes in transactions exempt from the registration requirements of the Securities Act. Principal Amount Common Stock of Notes Issuable Beneficially Owned upon Conversation Common Stock Selling Holder and Offered of the Notes (1) Offered --------------------------------------- -------------------- ------------------- -------------- AAM/Zazove Institutional Income 1,200,000 14,284 14,284 ABN AMRO Incorporated 500,000 5,951 5,951 S-1 Principal Amount Common Stock of Notes Issuable Beneficially Owned upon Conversation Common Stock Selling Holder and Offered of the Notes (1) Offered --------------------------------------- -------------------- ------------------- -------------- Fund, L.P. AIG Soundshore Opportunity Holding 2,488,000 29,615 29,615 Fund Ltd. AIG Soundshore Strategic Holding 2,185,000 26,008 26,008 Fund Ltd. Alexandria Global Investment Fund I LTD. 3,000,000 35,710 35,710 Arbitex Master Fund, L.P. 4,500,000 53,565 53,565 Argent Classic Convertible Arbitrage 15,000,000 178,550 178,550 Fund (Bermuda) L.P. Argent Convertible Arbitrage Fund Ltd. 1,000,000 11,903 11,903 Aspen Global Technology Fund 674,000 8,023 8,023 Associated Electric & Gas Insurance 850,000 10,117 10,117 Services Limited AST Janus Small Cap Growth Portfolio 8,185,000 97,429 97,429 Aventis Pension Master Trust 440,000 5,237 5,237 Bank Austria Cayman Islands, Ltd. 5,500,000 65,468 65,468 Bank of America Securities, LLC 5,000,000 59,516 59,516 BankAmerica Pension Plan 2,000,000 23,807 23,807 Black Diamond Offshore, Ltd. 665,000 7,916 7,916 Boilermaker - Blacksmith Pension Trust 2,700,000 32,139 32,139 BS Debt Income Fund - Class A 15,000 178 178 CALAMOS(R) Convertible Portfolio - 150,000 1,785 1,785 CALAMOS(R) Advisors Trust CALAMOS(R) Convertible Technology Fund 390,000 4,642 4,642 - CALAMOS(R) Investment Trust CALAMOS(R)High Yield Fund - 390,000 4,642 4,642 CALAMOS(R) Investment Trust Canyon Capital Arbitrage Master Fund 1,000,000 11,903 11,903 Canyon Value Realization (Cayman) Ltd. 11,000,000 130,937 130,937 S-2 Principal Amount Common Stock of Notes Issuable Common Beneficially Owned upon Conversation Stock Selling Holder and Offered of the Notes (1) Offered ------------------------------------------------------------------------------------------------------------------------- CFFX, LLC 1,000,000 11,903 11,903 CIBC World Markets 5,500,000 65,468 65,468 City of Albany Pension Fund 245,000 2,916 2,916 City of Knoxville Pension System 640,000 7,618 7,618 Clinton Riverside Convertible Portfolio Limited 2,100,000 24,997 24,997 Cova Bond Debenture Fund 500,000 5,952 5,952 Coastal Convertibles Ltd. 500,000 5,952 5,952 Credit Suisse First Boston Corporation 3,000,000 35,710 35,710 Credit Research & Trading LLC 25,980,000 309,248 309,248 Deeprock + Co. 2,000,000 23,807 23,807 Delphi Financial Group, Inc. 500,000 5,952 5,952 Delta Airlines Master Trust 4,900,000 58,326 58,326 Delta Pilots Disability Survivorship Trust 200,000 2,380 2,380 Department of Fire & Police Pensions Systems 7,075,000 84,216 84,216 Deutsche Bank Securities Inc. 56,134,000 668,182 668,182 Double Black Diamond Offshore, LDC 2,708,000 32,234 32,234 Dreyfus High Yield Strategies Fund 5,200,000 61,897 61,897 Duckbill + Co. 630,000 7,499 7,499 Enron Global Markets, Inc. 1,000,000 11,903 11,903 Elf Aquitaine 150,000 1,786 1,786 Florida Street Bond Fund 1,000,000 11,903 11,903 Fuji U.S. Income Open 500,000 5,952 5,952 General Motors Employees Global 6,175,000 73,503 73,503 General Motors Welfare Benefit Trust (St. Veba) 2,000,000 23,807 23,807 Greek Catholic Union II 45,000 535 535 Greenlight Capital, L.P. 4,437,000 52,815 52,815 Greenlight Capital Offshore, Ltd. 9,429,000 112,236 112,236 Greenlight Capital Qualified, L.P. 9,994,000 118,962 118,962 Helix Convertible Opportunities Fund Ltd. 2,660,000 31,662 31,662 Helix Convertible Opportunities, L.P. 3,140,000 37,376 37,376 Helix Credit Arbitage Master Fund, L.P. 2,315,000 27,556 27,556 IBM Retirement Plan - High Income 525,000 6,249 6,249 Ilanot Batucha Investment House LTD 300,000 3,571 3,571 S-3 Principal Amount Common Stock of Notes Issuable Common Beneficially Owned upon Conversation Stock Selling Holder and Offered of the Notes (1) Offered ------------------------------------------------------------------------------------------------------------------------------- Israel Brokerage & Investments IBI LTD 100,000 1,190 1,190 Janus Global Technology Fund 16,665,000 198,369 198,369 Janus Venture Fund 19,025,000 226,461 226,461 Jefferies & Co. 875,000 10,415 10,415 Jersey (IMA) Ltd. 250,000 2,976 2,976 JMG Capital Partners, L.P. 500,000 5,951 5,951 JMG Triton Offshore Fund, Ltd. 31,500,000 374,955 374,955 J.P. Morgan Securities, Inc. 5,030,000 59,873 59,873 Julius Baer Securities, Inc. 250,000 2,975 2,975 JWF Global Technology Fund 1,154,000 13,736 13,736 JWF US Ventre Fund 1,990,000 23,688 23,688 KBC Financial Products USA Inc. 4,500,000 53,565 53,565 Kettering Medical Center Funded Depreciation Account 160,000 1,904 1,904 Kentfield Trading, Ltd. 950,000 11,308 11,308 Knoxville Utilities Board Retirement System 400,000 4,761 4,761 Lehman Brothers Inc. 18,500,000 220,211 220,211 Leonardo, L.P, 12,000,000 142,840 142,840 LibertyView Funds L.P. 750,000 8,928 8,928 Lonestar Partners, L.P. 4,500,000 53,565 53,565 Lord Abbett Bond Debenture Fund 5,850,000 69,635 69,635 Louisiana Workers' Compensation Corporation 360,000 4,285 4,285 Lumber Industries, Inc. 750,000 8,927 8,927 Lydian Overseas Partners Master Fund 15,000,000 178,550 178,550 Magten Asset Management Corp. Pension Plan & Trust 485,000 5,773 5,773 Magten Group Trust 300,000 3,571 3,571 McMahan Securities Co. L.P. 1,000,000 11,903 11,903 S-4 Principal Amount Common Stock of Notes Issuable Beneficially Owned upon Conversation Common Stock Selling Holder and Offered of the Notes (1) Offered --------------------------------------------------- ------------------- ----------------- ------------ Merrill, Lynch, Pierce, Fenner and Smith, Inc. 16,000 190 190 Miller Tabak Robert Securities, LLC 45,000 535 535 Morgan Stanley & Co. 2,500,000 29,758 29,758 Nomura/Janus Global Technology 1,507,000 17,938 17,938 Oxford Lord Abbett + Co. 1,000,000 11,903 11,903 Pacific Life Insurance Company 1,000,000 11,903 11,903 Peoples Benefit Life Insurance Company 4,220,000 50,232 50,232 Peoples Benefit Life Insurance Company (Teamsters 6,250,000 74,395 74,395 Separate Account) Port Authority of Allegheny County 2,825,000 33,626 33,626 Retirement and Disability Allowance Plan for the Employees Represented by Local 85 of the Amalgamated Transit Union Quattro Crestline Special Situations 500,000 5,951 5,951 Quattro Fund 1,000,000 11,903 11,903 Ramus Capital Group Holdings, Ltd. 1,300,000 15,474 15,474 RCG Latitude Master Fund, Ltd. 200,000 2,380 2,380 Research Capital Corporation 9,650,000 114,867 114,867 Retail Clerks Pension Trust 2,000,000 23,807 23,807 Retail Clerks Pension Trust #2 1,000,000 11,903 11,903 Sage Capital 3,000,000 35,710 35,710 San Diego County Employee's 475,000 5,654 5,654 Retirement Association SPT 1,100,000 13,093 13,093 Spear, Leeds & Kellogg Capital Markets 2,000,000 23,806 23,806 St. Albans Partners Ltd. 4,000,000 47,613 47,613 Standard Mortage Holding Corp. 500,000 5,951 5,951 The Bakal Company Limited Partnership 150,000 1,785 1,785 The Class IC Company, Ltd. 1,500,000 17,855 17,855 The Common Fund FAO Absolute Return Fund 635,000 7,558 7,558 S-5 Principal Amount Common Stock of Notes Issuable Beneficially Owned upon Conversation Common Stock Selling Holder and Offered of the Notes (1) Offered --------------------------------------- -------------------- ------------------- -------------- The Dow Chemical Company Employees' 5,325,000 63,385 63,385 Retirement Plan The Fondren Foundation 165,000 1,964 1,964 TQA Master Fund, LTD 1,000,000 11,903 11,903 TQA Master Plus Fund, Ltd. 435,000 5,177 5,177 UBS AG, London Branch 20,000,000 238,066 238,066 UBS Warburg AG 2,000,000 23,806 23,806 Unifi, Inc. Profit Sharing Plan and 255,000 3,035 3,035 Trust United Food and Commercial Workers 1,260,000 14,998 14,998 Local 1262 and Employees Pension Fund United Mizrahi Bank LTD 50,000 595 595 Valentis Investors LLC 2,000,000 23,806 23,806 Value Realization Fund B, LP 500,000 5,952 5,952 Value Realization Fund, L.P. 8,000,000 95,227 95,227 Van Waters & Rogers, Inc. 770,000 9,165 9,165 Retirement Plan Wasserstein Perella Securities Inc. 7,600,000 90,465 90,465 Worldwide Transactions, Ltd. 127,000 1,512 1,512 Zurich HFR Master Hedge Fund Index Ltd. 300,000 3,571 3,571 Any other holders of Notes or future 25,512,000 303,775 303,775 holders (2) Total $500,000,000 5,951,673 5,951,673 (1) Assumes a conversion rate of 11.9033 shares of common stock per $1,000 principal amount of Notes and a cash payment in lieu of any fractional interest. S-6 (2) Assumes that any other holders of Notes or any future transferee from any holder do not or will not beneficially own any common stock other than common stock into which the Notes are convertible at the conversion rate of 11.9033 shares of common stock per $1,000 principal amount of Notes. None of the selling holders nor any of their affiliates, officers, directors or principal equity holders has held any position or office or has had any material relationship with us within the past three years with the exception of Deutsche Bank Securities, Inc. and Lehman Brothers, Inc. In the past three years, Deutsche Bank and Lehman Brothers have acted as underwriters of the Company's initial public offering and follow-on public offering and were initial purchasers in the offering of the Notes. The selling holders purchased all of the Notes in a private transaction. All of the Notes and the shares of common stock into which the Notes are convertible are "restricted securities" under the Securities Act. Information concerning the selling holders may change from time to time and any changed information will be set forth in supplements to this prospectus if and when necessary. In addition, the conversion price, and therefore, the number of shares of common stock issuable upon conversion of the Notes, is subject to adjustment under certain circumstances. Accordingly, the aggregate principal amount of Notes and the number of shares of common stock into which the Notes are convertible may increase or decrease. The date of this prospectus supplement no. 9 is April 27, 2001. S-7