-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 UAIy2koYzkJAuWVYCucP4ofKTmN2LF4saFG7/WuRuheSLD78T8L8U7idrtGDGifk
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<SEC-DOCUMENT>0001140361-10-001359.txt : 20100108
<SEC-HEADER>0001140361-10-001359.hdr.sgml : 20100108
<ACCEPTANCE-DATETIME>20100108182141
ACCESSION NUMBER:		0001140361-10-001359
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100106
FILED AS OF DATE:		20100108
DATE AS OF CHANGE:		20100108

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JUVONEN RONALD
		CENTRAL INDEX KEY:			0001137058

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50052
		FILM NUMBER:		10518587

	MAIL ADDRESS:	
		STREET 1:		C/O DOWNTOWN ASSOCIATES
		STREET 2:		674 UNIONVILLE ROAD, SUITE 105
		CITY:			KENNETT SQUARE
		STATE:			PA
		ZIP:			19348

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COSI INC
		CENTRAL INDEX KEY:			0001171014
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-EATING PLACES [5812]
		IRS NUMBER:				061393745
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0101

	BUSINESS ADDRESS:	
		STREET 1:		COSI INC
		STREET 2:		1751 LAKE COOK ROAD SUITE 650
		CITY:			DEERFIELD
		STATE:			IL
		ZIP:			60015
		BUSINESS PHONE:		847-597-3200

	MAIL ADDRESS:	
		STREET 1:		1751 LAKE COOK ROAD
		STREET 2:		SUITE 650
		CITY:			DEERFIELD
		STATE:			IL
		ZIP:			60015
</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>2010-01-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001171014</issuerCik>
        <issuerName>COSI INC</issuerName>
        <issuerTradingSymbol>COSI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001137058</rptOwnerCik>
            <rptOwnerName>JUVONEN RONALD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O DOWNTOWN ASSOCIATES, L.L.C.</rptOwnerStreet1>
            <rptOwnerStreet2>674 UNIONVILLE ROAD, SUITE 105</rptOwnerStreet2>
            <rptOwnerCity>KENNETT SQUARE</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19348</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, $0.01 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2010-01-06</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1065411</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5419363</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By partnerships and limited liability company</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Subscription Rights (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.50</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-01-06</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4353952</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2009-12-08</value>
            </exerciseDate>
            <expirationDate>
                <value>2010-01-06</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock, par value $0.01</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1065411</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By partnerships and limited liability company</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The securities reported herein reflect shares of common stock, par value $0.01 per share (&quot;Common Stock&quot;), of Cosi, Inc. (the &quot;Company&quot;) acquired by Downtown Associates I, L.P. and Downtown Associates II, L.P. (collectively referred to as the &quot;Downtown Funds&quot;) pursuant to their basic subscription rights in the rights offering of the Company completed on January 6, 2010 (the &quot;Rights Offering&quot;).  This filing does not include any additional shares of Common Stock that the Downtown Funds may receive pursuant to their over-subscription privilege, which number of additional shares are not known as of the date of this filing.</footnote>
        <footnote id="F2">The securities reported herein are held by the Downtown Funds.  The reporting person's indirect interest in the securities held by the Downtown Funds is limited to his pecuniary interest, if any, in the Downtown Funds.</footnote>
        <footnote id="F3">Pursuant to the terms of the Company's Rights Offering, the Downtown Funds received one subscription right for each share of Common Stock owned by the Downtown Funds on November 27, 2009.  Each subscription right entitled the holder to purchase 0.2447 shares of Common Stock at a subscription price of $0.50 per full share.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Ronald J. Juvonen</signatureName>
        <signatureDate>2010-01-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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