-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 bQ4Wtkjd6OxEKL7zq/C8aA==

<SEC-DOCUMENT>0001140361-10-037778.txt : 20100917
<SEC-HEADER>0001140361-10-037778.hdr.sgml : 20100917
<ACCEPTANCE-DATETIME>20100917164339
ACCESSION NUMBER:		0001140361-10-037778
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100610
FILED AS OF DATE:		20100917
DATE AS OF CHANGE:		20100917

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MEMSIC Inc
		CENTRAL INDEX KEY:			0001386198
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				000000000
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		800 Turnpike Street
		CITY:			North Andover
		STATE:			MA
		ZIP:			01845
		BUSINESS PHONE:		9787380900

	MAIL ADDRESS:	
		STREET 1:		800 Turnpike Street
		CITY:			North Andover
		STATE:			MA
		ZIP:			01845

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AMERIPRISE FINANCIAL INC
		CENTRAL INDEX KEY:			0000820027
		STANDARD INDUSTRIAL CLASSIFICATION:	INVESTMENT ADVICE [6282]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33813
		FILM NUMBER:		101078609

	BUSINESS ADDRESS:	
		STREET 1:		1099 AMERIPRISE FINANCIAL CENTER
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55474
		BUSINESS PHONE:		612-671-2018

	MAIL ADDRESS:	
		STREET 1:		1099 AMERIPRISE FINANCIAL CENTER
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55474

	FORMER NAME:	
		FORMER CONFORMED NAME:	AMERICAN EXPRESS FINANCIAL CORP
		DATE OF NAME CHANGE:	20030513

	FORMER NAME:	
		FORMER CONFORMED NAME:	AMERICAN EXPRESS FINANCIAL ADVISORS
		DATE OF NAME CHANGE:	19950711

	FORMER NAME:	
		FORMER CONFORMED NAME:	IDS FINANCIAL CORP/MN/
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COLUMBIA MANAGEMENT INVESTMENT ADVISERS, LLC
		CENTRAL INDEX KEY:			0001233991

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33813
		FILM NUMBER:		101078610

	BUSINESS ADDRESS:	
		STREET 1:		100 FEDERAL STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		612-671-4321

	MAIL ADDRESS:	
		STREET 1:		100 FEDERAL STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

	FORMER NAME:	
		FORMER CONFORMED NAME:	RIVERSOURCE INVESTMENTS LLC
		DATE OF NAME CHANGE:	20060510

	FORMER NAME:	
		FORMER CONFORMED NAME:	AMERICAN EXPRESS ASSET MANAGEMENT GROUP INC
		DATE OF NAME CHANGE:	20030519
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4/A
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2010-06-10</periodOfReport>

    <dateOfOriginalSubmission>2010-06-14</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001386198</issuerCik>
        <issuerName>MEMSIC Inc</issuerName>
        <issuerTradingSymbol>MEMS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001233991</rptOwnerCik>
            <rptOwnerName>COLUMBIA MANAGEMENT INVESTMENT ADVISERS, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>145 AMERIPRISE FINANCIAL CENTER</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55474</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000820027</rptOwnerCik>
            <rptOwnerName>AMERIPRISE FINANCIAL INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>145 AMERIPRISE FINANCIAL CENTER</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55474</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-06-10</value>
                <footnoteId id="F1"/>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Investment adviser on behalf of clients</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On June 14, 2010, the Reporting Persons filed a Form 4 reporting the purchase of 100 shares of Memsic Inc. common stock in which they had no pecuniary interest.  The Reporting Persons file this amended Form 4 to delete references to that purchase transaction and to reflect that they have no pecuniary interest in any shares of Memsic Inc. common stock. At the time of the filing of the original Form 4, Columbia Management Investment Advisers, LLC was known as RiverSource Investments, LLC.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Tara Tilbury, Assistant Secretary of Columbia Management Investment Advisers, LLC</signatureName>
        <signatureDate>2010-09-17</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>David H. Weiser, SVP and Assistant General Counsel, Ameriprise Financial, Inc.</signatureName>
        <signatureDate>2010-09-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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