<SEC-DOCUMENT>0001111770-14-000004.txt : 20141024
<SEC-HEADER>0001111770-14-000004.hdr.sgml : 20141024
<ACCEPTANCE-DATETIME>20141024170316
ACCESSION NUMBER:		0001111770-14-000004
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20130621
FILED AS OF DATE:		20141024
DATE AS OF CHANGE:		20141024

ISSUER:		

	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

	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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KELLEHER BARRY
		CENTRAL INDEX KEY:			0001111770

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-18277
		FILM NUMBER:		141172969

	MAIL ADDRESS:	
		STREET 1:		25 FRONTAGE ROAD
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2013-06-21</periodOfReport>

    <dateOfOriginalSubmission>2013-06-25</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000751978</issuerCik>
        <issuerName>VICOR CORP</issuerName>
        <issuerTradingSymbol>vicr</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001111770</rptOwnerCik>
            <rptOwnerName>KELLEHER BARRY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>25 FRONTAGE ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ANDOVER</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01810</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President, Brick Business Unit</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Non Qualified Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.67</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2013-06-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1764</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2014-06-21</value>
            </exerciseDate>
            <expirationDate>
                <value>2023-06-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1764</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>100000</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person is filing this amendment to report the correct amount of options acquired on June 21, 2013.  In a Form 4/A filed on October 20, 2014, the reporting person amended the original Form 4 of June 25, 2013, which reflected the acquisition of options to purchase 8,819 shares pursuant to the Company's Amended and Restated 2000 Stock Option and Incentive Plan (the &quot;Plan&quot;), indicating that none of the options were validly granted.  However, the Company subsequently determined options to purchase 1,764 shares were validly granted on June 21, 2013.</footnote>
        <footnote id="F2">On the Form 4/A filed on October 20, 2014, the amended number of derivative Securities Beneficially Owned of 100,000 (Table II, Box 9) is correct and is not the subject of this amendment.  As previously disclosed, the Company determined, subsequent to the filing by the reporting person of the Form 4 of June 25, 2013, that options to purchase 69,514 shares, in aggregate and including the 7,055 shares that are the subject of this amendment, were not validly granted during 2013, pursuant to the Plan, because the grants exceeded the limit on the number of options that may be granted to any individual participant within any calendar year.  Accordingly, the attempted grant of these excess options was ineffective, and they were never granted to the reporting person.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Kemble D. Morrison, Attorney in fact for Barry Kelleher</signatureName>
        <signatureDate>2014-10-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
