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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. 6) 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 - -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 20,984,151 NUMBER OF ------------------------------------------------------- SHARES 6. SHARED VOTING POWER 0 BENEFICIALLY OWNED BY ------------------------------------------------------- EACH 7. SOLE DISPOSITIVE POWER 20,984,151 REPORTING PERSON WITH ------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 - -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 20,984,151 - -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 49.0% - -------------------------------------------------------------------------------- 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: 20,984,151 (this amount includes 3,515 shares which the Reporting Person has the right to acquire upon the exercise of options to purchase Common Stock) (b) Percent of class: 49.0% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 20,984,151 As of December 31, 1997, Mr. Vinciarelli was the beneficial owner of 9,960,503 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: 20,984,151 (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: January 21, 1998 /s/ Patrizio Vinciarelli ------------------------- Name: Patrizio Vinciarelli Title: Chairman of the Board, President and Chief Executive Officer