Filing Pursuant to Rule 424(b)(3) Registration Statement No. 333-48536 PROSPECTUS SUPPLEMENT NO. 13 DATED JUNE 4, 2001 TO PROSPECTUS DATED JANUARY 22, 2001 TERAYON COMMUNICATION SYSTEMS, INC. $500,000,000 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 thru 24 of the Prospectus setting forth information concerning the selling holders, prospectus supplement no. 1 dated February 9, 2001, prospectus supplement no. 2 dated February 16, 2001, prospectus supplement no. 3 dated February 20, 2001, prospectus supplement no. 4 dated February 23, 2001, prospectus supplement no. 5 dated March 2, 2001, prospectus supplement no. 6 dated March 9, 2001, prospectus supplement no. 7 dated March 16, 2001, prospectus supplement no. 8 dated March 23, 2001, prospectus supplement no. 9 April 27, 2001, prospectus supplement no. 10 dated May 4, 2001, prospectus supplement no. 11 dated May 11, 2001 and prospectus supplement no. 12 dated May 25, 2001 are superseded by the following table: SELLING HOLDERS We originally issued the Notes and the Notes were sold by the initial purchasers in a transaction exempt from the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 June 4, 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 upon Beneficially Owned Conversion Common Selling Holder and Offered of the Notes Stock Offered -------------- ------------------ ---------------- --------------- Arbitex Master Fund, L.P. 1,200,000 14,284 14,284 Aventis Pension Master Trust 440,000 5,237 5,237 S-1 Principal Amount Common Stock of Notes Issuable upon Beneficially Owned Conversion Common Selling Holder and Offered of the Notes Stock Offered ------------ ------------------ ---------------- --------------- Black Diamond Offshore, Ltd. 665,000 7,915 7,915 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 - CALAMOS(R) Advisors Trust 150,000 1,785 1,785 CALAMOS(R) Convertible Technology - Fund CALAMOS(R) Investment Trust 230,000 2,737 2,737 CALAMOS(R) High Yield Fund - CALAMOS(R) Investment Trust 245,000 2,916 2,916 City of Albany Pension Fund 245,000 2,916 2,916 City of Knoxville Pension System 640,000 7,618 7,618 Credit Suisse First Boston 1,000,000 11,903 11,903 Delta Airlines Master Trust 4,900,000 58,326 58,326 Delta Pilots Disability Survivorship Trust 200,000 2,380 2,380 Deutsche Bank Securities Inc. 200,000 2,380 2,380 Double Black Diamond Offshore, LDC 2,708,000 32,234 32,234 ECT Investments, Inc. 1,000,000 11,903 11,903 Greenlight Capital, L.P. 1,055,000 12,558 12,558 Greenlight Capital Offshore, Ltd. 2,413,000 28,722 28,722 Greenlight Capital Qualified, L.P. 2,532,000 30,139 30,139 Ilanot Batucha Investment House, Ltd. 300,000 3,571 3,571 Israel Brokerage & Investments IBI, Ltd. 100,000 1,190 1,190 Jefferies & Co. 875,000 10,415 10,415 JMG Capital Partners, L.P. 500,000 5,951 5,951 S-2 Principal Amount Common Stock of Notes Issuable upon Beneficially Owned Conversion Common Selling Holder and Offered of the Notes Stock Offered -------------- ------------------ ---------------- --------------- JMG Triton Offshore Fund, Ltd. 500,000 5,951 5,951 JRS, Ltd. 1,000,000 11,903 11,903 Julius Baer Securities, Inc. 250,000 2,975 2,975 KBC Financial Products USA, Inc. 900,000 10,713 10,713 Kettering Medical Center Funded-Depreciation Account 160,000 1,904 1,904 Knoxville Utilities Board Retirement System 400,000 4,761 4,761 Lehman Brothers, Inc. 1,200,000 14,284 14,284 Leonardo, L.P. 12,000,000 142,840 142,840 LibertyView Funds, L.L.C. 100,000 1,190 1,190 LibertyView Funds, L.P. 400,000 4,761 4,761 Lonestar Partners, L.P. 4,500,000 53,565 53,565 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 McMahan Securities Co., L.P. 1,000,000 11,903 11,903 Merrill, Lynch, Pierce, Fenner and Smith, Inc. 16,000 190 190 Morgan Stanley & Co. 2,500,000 29,758 29,758 Pacific Life Insurance Company 1,000,000 11,903 11,903 Port Authority of Allegheny County Retirement and Disability Allowance Plan for the Employees Represented by Local 85 of the Amalgamated Transit Union 2,825,000 33,626 33,626 Ramus Capital Group Holdings, Ltd. 200,000 2,380 2,380 Research Capital Corporation 750,000 8,927 8,927 Spear, Leads & Kellogg Capital Markets 2,400,000 28,568 28,568 SPT 1,100,000 13,093 13,093 S-3 Principal Amount Common Stock of Notes Issuable upon Beneficially Owned Conversion Common Selling Holder and Offered of the Notes Stock Offered -------------- ------------------ ---------------- --------------- Standard Mortgage Holding Corp. 500,000 5,951 5,951 The Class IC Company, Ltd. 1,500,000 17,855 17,855 The Dow Chemical Company Employees' Retirement Plan 5,325,000 63,385 63,385 The Fondren Foundation 165,000 1,964 1,964 Unifi, Inc. Profit Sharing Plan and Trust 255,000 3,035 3,035 United Food and Commercial Workers Local 1262 and Employees Pension Fund 1,260,000 14,998 14,998 United Mizrahi Bank, Ltd. 50,000 595 595 Valentis Investors, L.L.C. 2,000,000 23,806 23,806 Van Waters & Rogers, Inc. Retirement Plan 770,000 9,165 9,165 Any other holders of Notes or future holders (3) 414,551,000 4,934,565 4,934,565 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. (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. (3) The principal amount of Notes held by other holders or future holders includes $195,597,000 principal amount of Notes repurchased by the Company in February 2001 which is convertible into 2,328,258 shares of common stock. 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, Inc. and Lehman Brothers, Inc. 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 is June 4, 2001. S-4