13D Filings
CYCLERION THERAPEUTICS, INC.
CYCN
Amendment
Ownership

19.40%

Total Shares

910,240

Issuer CIK

1755237

Event Date

Jul 15, 2026

Accepted

Jul 20, 2026, 07:50 PM

Reporting Persons (1)
NameType% of ClassAggregateSole VotingShared Voting
Peter M. Hecht
Individual
19.40%910,240910,2400
Disclosure Items (2)

Security Title

Common Stock, no par value

Issuer Name

CYCLERION THERAPEUTICS, INC.

Issuer Address

245 First Street, Cambridge, MA, 02142

Percentage of Class

Item 5 of the Original Statement is hereby amended and restated in its entirety to read as follows: As calculated in accordance with Rule 13d-3 under the Securities Exchange Act of 1934, as amended, the Reporting Person beneficially owns 910,240 shares of Common Stock.

Number of Shares

The information in Items 7 through 10 of the cover page is incorporated by reference into this Item 5(b).

Transactions

Except as described in this Statement, the Reporting Person has not effected any transactions in the Common Stock during the past 60 days.

Shareholders

Not applicable.

Date of 5% Ownership

Not applicable.

CYCLERION THERAPEUTICS, INC. — Schedule 13D | 13D Filings