<SEC-DOCUMENT>0000902664-21-003032.txt : 20210607
<SEC-HEADER>0000902664-21-003032.hdr.sgml : 20210607
<ACCEPTANCE-DATETIME>20210607160518
ACCESSION NUMBER:		0000902664-21-003032
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210603
FILED AS OF DATE:		20210607
DATE AS OF CHANGE:		20210607

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Slate Path Capital LP
		CENTRAL INDEX KEY:			0001559706
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38787
		FILM NUMBER:		21999550

	BUSINESS ADDRESS:	
		STREET 1:		717 5TH AVENUE
		STREET 2:		16TH FL.
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		212-257-4330

	MAIL ADDRESS:	
		STREET 1:		717 5TH AVENUE
		STREET 2:		16TH FL.
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Greenspan David Gerald
		CENTRAL INDEX KEY:			0001820641

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38787
		FILM NUMBER:		21999549

	MAIL ADDRESS:	
		STREET 1:		C/O SLATE PATH CAPITAL LP
		STREET 2:		717 FIFTH AVENUE, 16TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cyclerion Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001755237
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				831895370
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		301 BINNEY STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		617-621-7722

	MAIL ADDRESS:	
		STREET 1:		301 BINNEY STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>ownership.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-06-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001755237</issuerCik>
        <issuerName>Cyclerion Therapeutics, Inc.</issuerName>
        <issuerTradingSymbol>CYCN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001559706</rptOwnerCik>
            <rptOwnerName>Slate Path Capital LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>717 5TH AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>16TH FL.</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</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>0001820641</rptOwnerCik>
            <rptOwnerName>Greenspan David Gerald</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SLATE PATH CAPITAL LP</rptOwnerStreet1>
            <rptOwnerStreet2>717 FIFTH AVENUE, 16TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</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, no par value</value>
            </securityTitle>
            <transactionDate>
                <value>2021-06-03</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>961538</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.12</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7157601</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The securities to which this filing relates are held by Slate Path Master Fund LP (the &quot;Master Fund&quot;), a Cayman Islands exempted limited partnership. Slate Path Capital LP (the &quot;Investment Manager&quot;), a Delaware limited partnership acts as the investment manager of the Master Fund. Mr. David Greenspan serves as the managing member of Jades GP, LLC, a Delaware limited liability company and the general partner of the Investment Manager. The filing of this statement shall not be deemed an admission that either Reporting Person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Act of 1934, as amended, or otherwise. Each of the Reporting Persons expressly disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>The Power of Attorney dated as of July 31, 2020 executed by David Greenspan authorizing Jim Feeney to sign and file this form on his behalf is attached as Exhibit 24.1 to the Reporting Persons Form 3 with respect to the Issuer filed with the Securities and Exchange Commission on August 10, 2020.</remarks>

    <ownerSignature>
        <signatureName>Slate Path Capital LP, By: Jades GP, LLC, its General Partner, By: /s/ John Metzner, its Chief Operating Officer</signatureName>
        <signatureDate>2021-06-07</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>David Greenspan, By: /s/ Jim Feeney as Attorney-in-Fact</signatureName>
        <signatureDate>2021-06-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
