<SEC-DOCUMENT>0001140361-21-022578-index.html : 20210628
<SEC-HEADER>0001140361-21-022578.hdr.sgml : 20210628
<ACCEPTANCE-DATETIME>20210628172547
ACCESSION NUMBER:		0001140361-21-022578
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20210624
FILED AS OF DATE:		20210628
DATE AS OF CHANGE:		20210628

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Fanucci Marsha
		CENTRAL INDEX KEY:			0001298814

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38787
		FILM NUMBER:		211054634

	MAIL ADDRESS:	
		STREET 1:		MILLENNIUM PHARMACEUTICALS, INC.
		STREET 2:		40 LANDSDOWNE STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139

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>form4.xml
<DESCRIPTION>FORM 4
<TEXT>
Document 1 - file: form4.html

Document 1 - RAW XML: form4.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>brhc10026339_ex24.htm
<DESCRIPTION>EXHIBIT 24
<TEXT>
Document 2 - file: brhc10026339_ex24.htm

</DOCUMENT>
</SEC-DOCUMENT>