-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001140361-10-025367.txt : 20100614
<SEC-HEADER>0001140361-10-025367.hdr.sgml : 20100614
<ACCEPTANCE-DATETIME>20100614122415
ACCESSION NUMBER:		0001140361-10-025367
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100610
FILED AS OF DATE:		20100614
DATE AS OF CHANGE:		20100614

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
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33813
		FILM NUMBER:		10894196

	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:			RIVERSOURCE INVESTMENTS LLC
		CENTRAL INDEX KEY:			0001233991
		STATE OF INCORPORATION:			MN

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33813
		FILM NUMBER:		10894195

	BUSINESS ADDRESS:	
		STREET 1:		50606 AMERIPRISE FINANCIAL CENTER
		STREET 2:		(H27/5228)
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55474
		BUSINESS PHONE:		612-671-4321

	MAIL ADDRESS:	
		STREET 1:		50606 AMERIPRISE FINANCIAL CENTER
		STREET 2:		(H27/5228)
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55474

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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

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

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001233991</rptOwnerCik>
            <rptOwnerName>RIVERSOURCE INVESTMENTS 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>55443</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>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>100</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.2500</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3093629</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Investment Adeviser on behalf of clients</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>This statement is filed pursuant to Section 16 of the Act and shall not be deemed an admission that the reporting persons are, for purposes of Section 16 of the Act or otherwise, the beneficial owners of these securities.</remarks>

    <ownerSignature>
        <signatureName>Paul B. Goucher, Assistant Secretary of Investment Adviser</signatureName>
        <signatureDate>2010-06-14</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>David H. Weiser, SVP and Assistant General Counsel, Ameriprise Financial, Inc.</signatureName>
        <signatureDate>2010-06-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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