Filing Pursuant to Rule 424(b)(3) Registration Statement No. 333-37978 PROSPECTUS SUPPLEMENT NO. 1 DATED FEBRUARY 21, 2001 TO PROSPECTUS DATED JANUARY 3, 2001 TERAYON COMMUNICATION SYSTEMS, INC. 536,766 Shares of Common Stock Please read this prospectus supplement in conjunction with the prospectus dated January 3, 2001 (the "Prospectus"). The table on page 19 of the Prospectus setting forth information concerning the selling stockholders is superseded by the following table: SELLING STOCKHOLDERS In our acquisition of Ultracom which we consummated in April 2000, we issued to all of the selling stockholders shares of our common stock, and we agreed to register all of those shares for resale. We also agreed to use reasonable efforts to keep the registration statement effective until July 5, 2001. Our registration of the shares of common stock does not necessarily mean that the selling stockholders will sell all or any of the shares. The following table sets forth certain information regarding the beneficial ownership of the common stock, as of February 21, 2001, by each of the selling stockholders. The information provided in the table below with respect to each selling stockholder has been obtained from that selling stockholder. Except as otherwise disclosed below, none of the selling stockholders has, or within the past three years has had, any position, office or other material relationship with us. Because the selling stockholders may sell all or some portion of the shares of common stock beneficially owned by them, we cannot estimate the number of shares of common stock that will be beneficially owned by the selling stockholders after this offering. In addition, the selling stockholders may have sold, transferred or otherwise disposed of, or may sell, transfer or otherwise dispose of, at any time or from time to time since the date on which they provided the information regarding the shares of common stock beneficially owned by them, all or a portion of the shares of common stock beneficially owned by them in transactions exempt from the registration requirements of the Securities Act of 1933. Beneficial ownership is determined in accordance with Rule 13d-3(d) promulgated by the Commission under the Securities Exchange Act of 1934. Unless otherwise noted, each person or group identified possesses sole voting and investment power with respect to shares, subject to community property laws where applicable. None of the share amounts set forth below represents more than 1% of our outstanding stock as of February 21, 2001, adjusted as required by rules promulgated by the SEC. Number of Shares Being Shares Held in Selling Stockholder Shares Offered Escrow --------------------------------------------------------------------------------------------------- Moshe Shahaf 6 6 0 Orckit Communications Ltd. 28,202 28,202 3,206 Investec Clali Trust Company Ltd. (Ziv) 138 138 16 Investec Clali Trust Company Ltd. (Katz) 8 8 0 Howard Strachman 7,998 7,998 910 Jerusalem Pacific Ventures LP 5,000 5,000 3,112 Mofet Israel Technology Fund Ltd. 10,410 10,410 1,184 SVE Star Ventures Enterprises No. III GbR 10,074 10,074 1,146 SVE Star Ventures Enterprises No. IIIA 842 842 96 SVM Star Ventures Managementgesellschaft mbH Nr. 3 & Co. 4,432 4,432 504 Betielgungs KG SVM Star Ventures Enterprises No. V 34,418 34,418 3,914 Star Management of Investments (1993) LP 6,056 6,056 688 Gilde IV Fund B.V. 18,478 18,478 2,102 One Liberty Fund III L.P. 112 112 12 Unicycle Trading Co. 2,230 2,230 254 Number of Shares Being Shares Held in Selling Stockholder Shares Offered Escrow --------------------------------------------------------------------------------------------------- Innovacom 2 7,436 7,436 846 Jerusalem Venture Partners L.P. 161,096 161,096 18,318 Jerusalem Venture Partners (Israel) L.P. 15,586 15,586 1,772 Gemini Israel II LP 50,988 50,988 5,798 Gemini Israel II Parallel Fund LP 40,004 40,004 4,548 Advent PGGM Gemini LP 6,500 6,500 740 Gemini Partner Investors LP 818 818 94 Digital Media & Communications L.P. 5,206 5,206 592 Chin LIN 509 509 0 Aharon Fogel 312 312 0 China Venture Mgmt. 231 231 0 Jay B. Morrison 547 547 0 Bruce J. Bauer 547 547 0 Ygal Ozechor 509 509 0 Mike Loughry 370 370 0 GAN FONDS D'INVESTISSEMENTS TRUST 878 878 0 JVP Corp. 547 547 0 IBBE, LLC 1,413 1,413 0 Gunther Family Trust 774 774 0 1677120 Canada Inc. 46 46 0 Jack Nash 366 366 0 Michael Rosenthal 183 183 0 Nechi Investments Inc. 228 228 0 Franfreluche Investments Inc. 228 228 0 Unicycle Trading Company 2,483 2,483 0 Hebrew University of Jerusalem 1,059 1,059 0 Jerusalem Development Authority 1,059 1,059 0 GAN FONDS D'INVESTISSEMENTS TRUST 4,386 4,386 0 Kwang Hua Development & Investment Ltd. 1,271 1,271 0 HV IPEP II - Partnership Fund LP-1 1,737 1,737 0 HV IPEP II - Parallel Partnership Fund LP-1 111 111 0 HV IPEP II - Partnership Fund LP-2 1,044 1,044 0 HV IPEP II - Parallel Partnership Fund LP-2 67 67 0 Accountant General Govt. of Israel 1,342 1,342 0 Newbury Investors Inc. 46 46 0 Newbury Investors Inc. 81 81 0 Advent International Corporation 2,230 2,230 254 Investec Clali Trust Company Ltd. (as trustee for the 46,018 46,018 employees)