<SEC-DOCUMENT>0001104659-24-107142.txt : 20241008
<SEC-HEADER>0001104659-24-107142.hdr.sgml : 20241008
<ACCEPTANCE-DATETIME>20241008210046
ACCESSION NUMBER:		0001104659-24-107142
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241004
FILED AS OF DATE:		20241008
DATE AS OF CHANGE:		20241008

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Deliargyris Efthymios
		CENTRAL INDEX KEY:			0001751617
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36792
		FILM NUMBER:		241361323

	MAIL ADDRESS:	
		STREET 1:		C/O PLX PHARMA,INC.8285 EL RIO STREET
		STREET 2:		SUITE 210
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77054

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cytosorbents Corp
		CENTRAL INDEX KEY:			0001175151
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		IRS NUMBER:				980373793
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		305 COLLEGE ROAD EAST
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08540
		BUSINESS PHONE:		973-329-8885

	MAIL ADDRESS:	
		STREET 1:		305 COLLEGE ROAD EAST
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08540

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MedaSorb Technologies CORP
		DATE OF NAME CHANGE:	20060807

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GILDER ENTERPRISES INC
		DATE OF NAME CHANGE:	20020611
</SEC-HEADER>
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<SEQUENCE>1
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<DESCRIPTION>OWNERSHIP DOCUMENT
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    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-10-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001175151</issuerCik>
        <issuerName>Cytosorbents Corp</issuerName>
        <issuerTradingSymbol>CTSO</issuerTradingSymbol>
    </issuer>

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        <reportingOwnerId>
            <rptOwnerCik>0001751617</rptOwnerCik>
            <rptOwnerName>Deliargyris Efthymios</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CYTOSORBENTS CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>305 COLLEGE ROAD EAST</rptOwnerStreet2>
            <rptOwnerCity>PRINCETON</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08540</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Medical Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
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    <derivativeTable>
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            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.19</value>
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            <transactionDate>
                <value>2024-10-04</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>100000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
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                <transactionAcquiredDisposedCode>
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                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
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                <value>2024-10-04</value>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>50000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
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                <transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50000</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These stock options were granted pursuant to the Amended and Restated CytoSorbents Corporation 2014 Long-Term Incentive Plan (the &quot;Plan&quot;). The shares underlying these stock options will vest immediately upon the Company's achievement of U.S. Food and Drug Administration clearance or approval of DrugSorb-ATR, subject to the Company's receipt of such clearance or approval prior to June 30, 2026 and the reporting person's continued service as of the applicable vesting date.</footnote>
        <footnote id="F2">These stock options were granted pursuant to the Plan. The shares underlying these stock options will vest immediately upon the Company's achievement of Health Canada clearance or approval of DrugSorb-ATR , subject to the Company's receipt of such clearance or approval prior to June 30, 2026 and the reporting person's continued service as of the applicable vesting date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Efthymios Deliargyris</signatureName>
        <signatureDate>2024-10-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
