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1 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-C REPORT BY ISSUER OF SECURITIES QUOTED ON NASDAQ INTERDEALER QUOTATION SYSTEM FILED PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 AND RULES 13a-17 AND 15d-17 THEREUNDER Vertex Pharmaceuticals Incorporated - -------------------------------------------------------------------------------- (Exact name of issuer as specified in charter) 130 Waverley Street - -------------------------------------------------------------------------------- (Address of principal executive offices) Issuer's telephone number, including are code (617) 577-6000 ----------------------------------- I. CHANGE IN NUMBER OF SHARES OUTSTANDING Indicate any change (increase or decrease) of five percent or more in the number of shares outstanding: 1. Title of security Common Stock, $.01 par value per share ------------------------------------------------------------ 2. Number of shares outstanding before the change 17,358,458 ------------------------------- 3. Number of shares outstanding after the change 20,808,458 -------------------------------- 4. Effective date of change August 14, 1996 ----------------------------------------------------- 5. Method of change: Specify method (such as merger, acquisition, exchange, distribution, stock split, reverse split, acqusition of stock for treasury, etc.) Public Offering --------------------------------------------------------------------------- - -------------------------------------------------------------------------------- Give brief description of transaction 3,450,000 shares of Common Stock sold --------------------------------------- in a firm underwritten public offering --------------------------------------- II. CHANGE IN NAME OF ISSUER 1. Name prior to change --------------------------------------------------------- 2. Name after change ------------------------------------------------------------ 3. Effective date of charter amendment changing name ---------------------------- 4. Date of shareholder approval of change, if required -------------------------- Date August 15, 1996 /s/ Thomas G. Auchincloss, Jr. --------------------------- ----------------------------------------- Senior Director of Finance and Treasurer ----------------------------------------- (Officer's signature and title)