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Filing Details

Accession Number:: 0000899243-21-022327
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2021-06-07 17:36:24
Reporting Period:: 2021-06-03

Accepted Time:: 2021-06-07 17:36:24
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1755237	Cyclerion Therapeutics Inc.	CYCN	()	MA

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1117003	Terrance Mcguire	C/O Cyclerion Therapeutics, Inc. 245 First Street, 18Th Floor Cambridge MA 02142		Yes	No	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2021-06-03	92,831	$3.12	697,313	No	4	P	Indirect	By Polaris Partners VIII, L.P.
Common Stock	Acquisiton	2021-06-03	3,322	$3.12	24,957	No	4	P	Indirect	By Polaris Entrepreneurs' Fund VIII, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Polaris Partners VIII, L.P.
No	4	P	Indirect	By Polaris Entrepreneurs' Fund VIII, L.P.

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	162	Indirect	By Polaris Venture Management Co. II, L.L.C.
Common Stock	6,911	Indirect	By Bartlett Partners, LLC
Common Stock	11,047	Direct

Footnotes

On June 3, 2021, Polaris Partners VIII, L.P. ("PP VIII") and Polaris Entrepreneurs' Fund VIII, L.P. ("PEF VIII") agreed to purchase directly from the Issuer such shares of Common Stock of the Issuer in a private placement transaction.
The reportable securities are owned directly by PP VIII. Polaris Partners GP VIII, L.L.C. ("PPGP VIII") is the general partner of PP VIII. The Reporting Person, a member of the Issuer's Board of Directors, is an interest holder of PPGP VIII. Each of David Barrett, Brian Chee, Amir Nashat and Bryce Youngren are the managing members of PPGP VIII (collectively, the "Managing Members"). Each of the Reporting Person and the Managing Members, in their respective capacities with respect to PPGP VIII, may be deemed to have shared voting and dispositive power over the shares held by PP VIII. Each of PPGP VIII, the Reporting Person and the Managing Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any one of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.
The reportable securities are owned directly by PEF VIII. PPGP VIII is the general partner of PEF VIII. The Reporting Person, a member of the Issuer's Board of Directors, is an interest holder of PPGP VIII. Each of the Reporting Person and the Managing Members, in their respective capacities with respect to PPGP VIII, may be deemed to have shared voting and dispositive power over the shares held by PEF VIII. Each of PPGP VIII, the Reporting Person and the Managing Members disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any one of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.
The Reporting Person and Jonathan Flint ("Flint") are the managing members of Polaris Venture Management Co. II, L.L.C., the beneficial owner of the securities. Each of the Reporting Person and Flint disclaims beneficial ownership of these securities and this report shall not be deemed an admission that any one of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.
The Reporting Person is a managing member of Bartlett Partners, LLC, the beneficial owner of the securities. The Reporting Person disclaims beneficial ownership of these securities and this report shall not be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of his pecuniary interest therein.