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1 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 ---------- SCHEDULE 13G INFORMATION STATEMENT PURSUANT TO RULES 13d-1 and 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 5) VICOR CORPORATION - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock, Par Value $.01 Per Share - -------------------------------------------------------------------------------- (Title of Class of Securities) 925815 10 2 - -------------------------------------------------------------------------------- (CUSIP Number) ---------- 2 - --------------------- ------------------ CUSIP No. 925815 10 2 13G Page 2 of 6 Pages - --------------------- ------------------ - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Patrizio Vinciarelli - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3. SEC USE ONLY - -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION United States - -------------------------------------------------------------------------------- NUMBER OF 5. SOLE VOTING POWER 20,980,636 SHARES ---------------------------------------------------- BENEFICIALLY 6. SHARED VOTING POWER 0 OWNED BY ---------------------------------------------------- EACH 7. SOLE DISPOSITIVE POWER 20,980,636 REPORTING ---------------------------------------------------- PERSON WITH 8. SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 49.8% - -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- 3 - --------------------- ------------------ CUSIP No. 925815 10 2 13G Page 3 of 6 Pages - --------------------- ------------------ ITEM 1(a). NAME OF ISSUER: -------------- Vicor Corporation ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: ----------------------------------------------- 23 Frontage Road, Andover, MA 01810 ITEM 2(a). NAME OF PERSON FILING: --------------------- Patrizio Vinciarelli ITEM 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: ----------------------------------------------------------- Vicor Corporation, 23 Frontage Road, Andover, MA 01810 ITEM 2(c). CITIZENSHIP: ----------- United States ITEM 2(d) TITLE OF CLASS OF SECURITIES: ---------------------------- Common Stock, par value $.01 per share ITEM 2(e) CUSIP NUMBER: ------------ 925815 10 2 ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(b), OR 13D-2(b), CHECK WHETHER THE PERSON FILING IS A: Not applicable 4 - --------------------- ------------------ CUSIP No. 925815 10 2 13G Page 4 of 6 Pages - --------------------- ------------------ ITEM 4. OWNERSHIP. --------- If the percent of the class owned, as of December 31 of the year covered by the statement, or as of the last day of any month described in Rule 13d-1 (b)(2), if applicable, exceeds five percent, provide the following information as of that date and identify those shares which there is a right to acquire. (a) Amount beneficially owned: 20,980,636 (this amount includes 4,744 shares which the Reporting Person has the right to acquire upon the exercise of stock options) (b) Percent of class: 49.8% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 20,980,636 As of December 31, 1996, Mr. Vinciarelli was the beneficial owner of 9,956,988 shares of Vicor Corporation Common Stock. Additionally, he owned 11,023,648 shares of Vicor Corporation Class B Common Stock which may be converted at any time into 11,023,648 shares of Common Stock. (ii) Shared power to vote or to direct the vote: 0 (iii) Sole power to dispose or to direct the disposition of: 20,980,636 (iv) Shared power to dispose or to direct the disposition of: 0 ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. -------------------------------------------- Not applicable. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. --------------------------------------------------------------- Not applicable. 5 - --------------------- ------------------ CUSIP No. 925815 10 2 13G Page 5 of 6 Pages - --------------------- ------------------ ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH --------------------------------------------------------- ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING -------------------------------------------------------------- COMPANY. ------- Not applicable. ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. --------------------------------------------------------- Not applicable. ITEM 9. NOTICE OF DISSOLUTION OF GROUP. ------------------------------ Not applicable. ITEM 10. CERTIFICATION. ------------- Not applicable. 6 - --------------------- ------------------ CUSIP No. 925815 10 2 13G Page 6 of 6 Pages - --------------------- ------------------ SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: July 18, 1997 /s/ Patrizio Vinciarelli ------------------------------------------- Name: Patrizio Vinciarelli