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<SEC-DOCUMENT>0000950123-10-011330.txt : 20100211
<SEC-HEADER>0000950123-10-011330.hdr.sgml : 20100211
<ACCEPTANCE-DATETIME>20100211110501
ACCESSION NUMBER:		0000950123-10-011330
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20100211
DATE AS OF CHANGE:		20100211

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VINCIARELLI PATRIZIO
		CENTRAL INDEX KEY:			0000901484

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	MAIL ADDRESS:	
		STREET 1:		C/O VICOR CORPORATION
		STREET 2:		25 FRONTAGE ROAD
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VICOR CORP
		CENTRAL INDEX KEY:			0000751978
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRONIC COMPONENTS, NEC [3679]
		IRS NUMBER:				042742817
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-43949
		FILM NUMBER:		10590142

	BUSINESS ADDRESS:	
		STREET 1:		25 FRONTAGE ROAD
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810
		BUSINESS PHONE:		9784702900

	MAIL ADDRESS:	
		STREET 1:		25 FRONTAGE RD
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>b79419sc13gza.htm
<DESCRIPTION>SC 13G/A
<TEXT>
<HTML>
<HEAD>
<TITLE>sc13gza</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>SCHEDULE 13G/A</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>Under the Securities Exchange Act of 1934<BR>
(Amendment No.&nbsp;17)</B>
</DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>VICOR CORPORATION</B>
</DIV>

<DIV align="center" style="font-size: 10pt"><DIV style="width: 100%; border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></DIV>


<DIV align="center" style="font-size: 10pt">(Name of Issuer)</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 12pt">Common Stock, Par Value $.01 Per Share</div>
<DIV style="width: 100%; border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
<DIV align="center" style="font-size: 10pt; margin-top: 0pt">(Title of Class of Securities)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt">925815 10 2<BR>
<DIV style="width: 100%; border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 0pt">(CUSIP Number)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt">December&nbsp;31, 2009<BR>
<DIV style="width: 100%; border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 0pt">(Date of Event Which Requires Filing of this Statement)</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><FONT face="Wingdings">&#111;</FONT> Rule&nbsp;13d-1(b)</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><FONT face="Wingdings">&#111;</FONT> Rule&nbsp;13d-1(c)</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><FONT face="Wingdings">&#254;</FONT> Rule&nbsp;13d-1(d)</TD>
</TR>

</TABLE>
</DIV>

<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>







<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="20%">&nbsp;</TD>
<TD width="55%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->






<TR valign="bottom">
<TD valign="top" nowrap><DIV style="margin-left:0px; text-indent:-0px">CUSIP No.</DIV></TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">925815 10 2&nbsp;</DIV></TD>
<TD align="center" valign="top">13G/A</TD>
<TD align="left" valign="top">Page</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">2&nbsp;</DIV></TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">of&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">6 Pages&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P>&nbsp;<DIV style="width: 100%; border: 1px solid black"><DIV align="center">

<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="1" width="100%">
<!-- Begin Table Head --><TR style="font-size: 1px">
<TD width="5%">&nbsp;</TD>
<TD width="1%" style="border-left: 1px solid #000000">&nbsp;</TD>
<TD width="5%">&nbsp;</TD>
<TD width="5%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="83%">&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
<TD valign="middle" align="center"><FONT style="font-size: 18pt"><B>1</B></FONT></TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">NAME OF REPORTING PERSON<BR>
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)<BR><BR>Patrizio Vinciarelli</TD>
</TR>
<TR valign="bottom">
<TD>&nbsp;</TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">&nbsp;</TD>
</TR>

<TR style="font-size: 1px">
<TD style="border-top: 1px solid #000000">&nbsp;</TD>
<TD style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>


<TR valign="bottom">
<TD valign="middle" align="center" rowspan="3"><FONT style="font-size: 18pt"><B>2</B></FONT></TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <BR><BR></TD>
</TR>

<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">(a)&nbsp;&nbsp;&nbsp;<FONT face="wingdings" size="2">&#111;</FONT></TD>
</TR>

<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">(b)&nbsp;&nbsp;&nbsp;<FONT face="wingdings" size="2">&#111;</FONT></TD>
</TR>

<TR style="font-size: 1px">
<TD style="border-top: 1px solid #000000">&nbsp;</TD>
<TD style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD valign="middle" align="center" rowspan="3"><FONT style="font-size: 18pt"><B>3</B></FONT></TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">SEC USE ONLY</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">&nbsp;</TD>
</TR>

<TR style="font-size: 1px">
<TD style="border-top: 1px solid #000000">&nbsp;</TD>
<TD style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD valign="middle" align="center" rowspan="3"><FONT style="font-size: 18pt"><B>4</B></FONT></TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">CITIZENSHIP OR PLACE OF ORGANIZATION</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">United States</TD>
</TR>

<TR style="font-size: 1px">
<TD colspan="3" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD align="center" colspan="3">&nbsp;</TD>
<TD valign="middle" align="center" rowspan="3" style="border-left: 1px solid #000000; border-right: 1px solid #000000"><FONT style="font-size: 18pt"><B>5</B></FONT></TD>
<TD>&nbsp;</TD>
<TD align="left">SOLE VOTING POWER</TD>
</TR>
<TR valign="bottom">
<TD align="center" colspan="3">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD align="center" colspan="3">NUMBER OF</TD>
<TD>&nbsp;</TD>
<TD align="left">20,706,868</TD>
</TR>

<TR style="font-size: 1px">
<TD colspan="3">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD align="center" colspan="3">SHARES</TD>
<TD valign="middle" align="center" rowspan="3" style="border-left: 1px solid #000000; border-right: 1px solid #000000"><FONT style="font-size: 18pt"><B>6</B></FONT></TD>
<TD>&nbsp;</TD>
<TD align="left">SHARED VOTING POWER</TD>
</TR>
<TR valign="bottom">
<TD align="center" colspan="3">BENEFICIALLY</TD>
<TD>&nbsp;</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD align="center" colspan="3">OWNED BY</TD>
<TD>&nbsp;</TD>
<TD>0</TD>
</TR>

<TR style="font-size: 1px">
<TD colspan="3">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD align="center" colspan="3">EACH</TD>
<TD valign="middle" align="center" rowspan="3" style="border-left: 1px solid #000000; border-right: 1px solid #000000"><FONT style="font-size: 18pt"><B>7</B></FONT></TD>
<TD>&nbsp;</TD>
<TD align="left">SOLE DISPOSITIVE POWER</TD>
</TR>
<TR valign="bottom">
<TD align="center" colspan="3">REPORTING</TD>
<TD>&nbsp;</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD align="center" colspan="3">PERSON</TD>
<TD>&nbsp;</TD>
<TD align="left">20,706,868</TD>
</TR>

<TR style="font-size: 1px">
<TD colspan="3">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
<TD align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD align="center" colspan="3">WITH:</TD>
<TD valign="middle" align="center" rowspan="3" style="border-left: 1px solid #000000; border-right: 1px solid #000000"><FONT style="font-size: 18pt"><B>8</B></FONT></TD>
<TD>&nbsp;</TD>
<TD align="left">SHARED DISPOSITIVE POWER</TD>
</TR>
<TR valign="bottom">
<TD align="center" colspan="3">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD align="center" colspan="3">&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="left">0</TD>
</TR>

<TR style="font-size: 1px">
<TD style="border-top: 1px solid #000000">&nbsp;</TD>
<TD style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD valign="middle" align="center" rowspan="3"><FONT style="font-size: 18pt"><B>9</B></FONT></TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">20,706,868</TD>
</TR>

<TR style="font-size: 1px">
<TD style="border-top: 1px solid #000000">&nbsp;</TD>
<TD style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD valign="middle" align="center" rowspan="3"><FONT style="font-size: 18pt"><B>10</B></FONT></TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">CHECK IF THE AGGREGATE AMOUNT IN ROW (9)&nbsp;EXCLUDES CERTAIN SHARES</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left"><FONT face="wingdings" size="2">&#111;</FONT></TD>
</TR>

<TR style="font-size: 1px">
<TD style="border-top: 1px solid #000000">&nbsp;</TD>
<TD style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD valign="middle" align="center" rowspan="3"><FONT style="font-size: 18pt"><B>11</B></FONT></TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">50.6&#37;</TD>
</TR>

<TR style="font-size: 1px">
<TD style="border-top: 1px solid #000000">&nbsp;</TD>
<TD style="border-left: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>

<TR valign="bottom">
<TD valign="middle" align="center" rowspan="3"><FONT style="font-size: 18pt"><B>12</B></FONT></TD>
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">TYPE OF REPORTING PERSON </TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">&nbsp;</TD>
</TR>
<TR valign="bottom">
<TD style="border-left: 1px solid #000000">&nbsp;</TD>
<TD colspan="4" align="left">IN</TD>
</TR>
<!-- End Table Body --></TABLE>
</DIV>
</DIV>

<DIV style="font-size: 10pt; margin-top: 3pt">
</DIV>

<DIV style="font-size: 10pt; margin-top: 3pt">
</DIV>

<DIV style="font-size: 10pt; margin-top: 3pt">
</DIV>

<DIV style="font-size: 10pt; margin-top: 3pt">
</DIV>











<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="20%">&nbsp;</TD>
<TD width="55%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->






<TR valign="bottom">
<TD valign="top" nowrap><DIV style="margin-left:0px; text-indent:-0px">CUSIP No.</DIV></TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">925815 10 2&nbsp;</DIV></TD>
<TD align="center" valign="top">13G/A</TD>
<TD align="left" valign="top">Page</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">3&nbsp;</DIV></TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">of&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">6 Pages&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>




<!--TOC-->
<!--/TOC-->




<!-- link2 "ITEM 1(A). NAME OF ISSUER" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 1(A). NAME OF ISSUER:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 9%; margin-top: 6pt">Vicor Corporation
</DIV>

<!-- link2 "ITEM 1(B). ADDRESS OF ISSUER&#146;S PRINCIPAL EXECUTIVE OFFICES" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 1(B). ADDRESS OF ISSUER&#146;S PRINCIPAL EXECUTIVE OFFICES:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 9%; margin-top: 6pt">25 Frontage Road, Andover, MA 01810
</DIV>

<!-- link2 "ITEM 2(A). NAME OF PERSON FILING" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 2(A). NAME OF PERSON FILING:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 9%; margin-top: 6pt">Patrizio Vinciarelli
</DIV>

<!-- link2 "ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 9%; margin-top: 6pt">Vicor Corporation, 25 Frontage Road, Andover, MA 01810
</DIV>

<!-- link2 "ITEM 2(C). CITIZENSHIP" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 2(C). CITIZENSHIP:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 9%; margin-top: 6pt">United States
</DIV>

<!-- link2 "ITEM 2(D) TITLE OF CLASS OF SECURITIES" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 2(D) TITLE OF CLASS OF SECURITIES:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 9%; margin-top: 6pt">Common Stock, par value $.01 per share
</DIV>

<!-- link2 "ITEM 2(E) CUSIP NUMBER" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 2(E) CUSIP NUMBER:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 9%; margin-top: 6pt">925815 10 2
</DIV>

<!-- link2 "ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(B), OR 13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt; margin-left: 57px; text-indent: -57px">ITEM 3. &nbsp;&nbsp;&nbsp;&nbsp;IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(B),
OR 13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 8%; margin-top: 6pt">Not applicable
</DIV>






<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="20%">&nbsp;</TD>
<TD width="55%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->






<TR valign="bottom">
<TD valign="top" nowrap><DIV style="margin-left:0px; text-indent:-0px">CUSIP No.</DIV></TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">925815 10 2&nbsp;</DIV></TD>
<TD align="center" valign="top">13G/A</TD>
<TD align="left" valign="top">Page</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">4&nbsp;</DIV></TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">of&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">6 Pages&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<!-- link2 "ITEM 4. OWNERSHIP" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 4. OWNERSHIP.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provide the following information regarding the aggregate number and percentage of the class
of securities of the issuer identified in Item&nbsp;1.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;Amount beneficially owned: 20,706,868
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 1%">As of December&nbsp;31, 2009, Mr.&nbsp;Vinciarelli was the beneficial owner of 9,683,220 shares of Vicor
Corporation Common Stock (which number includes 7,740 shares which Mr.&nbsp;Vinciarelli has the right
to acquire upon the exercise of options to purchase Common Stock within 60&nbsp;days of December&nbsp;31,
2009). Additionally, he owned 11,023,648 shares of Vicor Corporation Class&nbsp;B Common Stock, which
may be converted at any time into 11,023,648 shares of Common Stock.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;Percent of class:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 1%">50.6%
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;Number of shares as to which such person has:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Sole power to vote or to direct the vote: 20,706,868</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Shared power to vote or to direct the vote: 0</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Sole power to dispose or to direct the disposition of: 20,706,868</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Shared power to dispose or to direct the disposition of: 0</TD>
</TR>

</TABLE>
</DIV>
<!-- link2 "ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 5.&nbsp; OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 7%; margin-top: 6pt">Not applicable.
</DIV>

<!-- link2 "ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 6.&nbsp; OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 7%; margin-top: 6pt">Not applicable.
</DIV>









<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="20%">&nbsp;</TD>
<TD width="55%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->






<TR valign="bottom">
<TD valign="top" nowrap><DIV style="margin-left:0px; text-indent:-0px">CUSIP No.</DIV></TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">925815 10 2&nbsp;</DIV></TD>
<TD align="center" valign="top">13G/A</TD>
<TD align="left" valign="top">Page</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">5&nbsp;</DIV></TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">of&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">6 Pages&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<!-- link2 "ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt; margin-left: 48px; text-indent: -48px">ITEM 7. &nbsp;IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 7%; margin-top: 6pt">Not applicable.
</DIV>

<!-- link2 "ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 8. &nbsp;IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 7%; margin-top: 6pt">Not applicable.
</DIV>

<!-- link2 "ITEM 9. NOTICE OF DISSOLUTION OF GROUP" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 9.&nbsp; NOTICE OF DISSOLUTION OF GROUP.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 7%; margin-top: 6pt">Not applicable.
</DIV>

<!-- link2 "ITEM 10. CERTIFICATION" -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">ITEM 10. &nbsp;CERTIFICATION.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-left: 7%; margin-top: 6pt">Not applicable.
</DIV>









<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="20%">&nbsp;</TD>
<TD width="55%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="1%">&nbsp;</TD>
<TD width="9%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->






<TR valign="bottom">
<TD valign="top" nowrap><DIV style="margin-left:0px; text-indent:-0px">CUSIP No.</DIV></TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">925815 10 2&nbsp;</DIV></TD>
<TD align="center" valign="top">13G/A</TD>
<TD align="left" valign="top">Page</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">6&nbsp;</DIV></TD>
<TD>&nbsp;</TD>
<TD align="left" valign="top">of&nbsp;</TD>
<TD>&nbsp;</TD>
<TD align="center" valign="top"><DIV style="border: 1px solid #000000">6 Pages&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<!-- link1 "SIGNATURE" -->

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">SIGNATURE
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">Dated: February 11, 2010&nbsp;</TD>
    <TD colspan="3" style="border-bottom: 1px solid #000000" align="left">/s/ Patrizio Vinciarelli
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">Name:&nbsp;&nbsp;</TD>
    <TD colspan="2" align="left">Patrizio Vinciarelli&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">Title:&nbsp;&nbsp;</TD>
    <TD colspan="2" align="left">Chairman of the Board,
President and <Br>Chief
Executive Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>


</BODY>
</HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
