Peter M. Hecht - 16 Jul 2026 Form 4 Insider Report for Cyclerion Therapeutics, Inc. (CYCN)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: CYCN
Reported as of: 16 Jul 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 20 Jul 2026, 17:04:57 UTC
Prior SEC filing: 27 Mar 2025
Source filing: View source filing
Reporting owner signature: /s/ Peter M. Hecht

Key filing fact

Peter M. Hecht filed Form 4 for Cyclerion Therapeutics, Inc. (CYCN) on 20 Jul 2026.

Key facts

This page summarizes Peter M. Hecht's Form 4 filing for Cyclerion Therapeutics, Inc. (CYCN).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 20 Jul 2026, 17:04.

Change

Previous filing in this sequence was filed on 27 Mar 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001478485 Primary reporting owner

Hecht Peter M

Relationship: Director, 10%+ Owner
Address: C/O CYCLERION THERAPEUTICS, INC., 245 FIRST STREET, 18TH FLOOR, CAMBRIDGE
Signature: /s/ Peter M. Hecht
Signature date: 20 Jul 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CYCN transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +351,037
Change %: +63%
Price
Shares after: 910,240
Date: 16 Jul 2026
Ownership: Direct
Footnotes: F1

CYCN holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 24
Date: 16 Jul 2026
Ownership: The 2000 Trust for Alexis Mae Hecht
Footnotes: F2

CYCN holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 24
Date: 16 Jul 2026
Ownership: The 2000 Trust for Malcolm Paul Hecht
Footnotes: F2

CYCN holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 24
Date: 16 Jul 2026
Ownership: The 2000 Trust for Zoe Niovi Hecht
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CYCN transaction Derivative

Series A Convertible Preferred Stock

Conversion of derivative security

Transaction value
Shares: -351,037
Change %: -100%
Price
Shares after: 0
Date: 16 Jul 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 351,037
Exercise price
Footnotes: F1, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

On May 19, 2023, the reporting person purchased directly from the Issuer 351,037 shares of Series A Convertible Preferred Stock (the "Series A Preferred Stock") at a price of $8.68 per share in a private placement transaction pursuant to the Stock Purchase Agreement dated as of March 31, 2023 between the reporting person and the Issuer. The Series A Preferred Stock is convertible to Common Stock on a one-for-one basis at the option of the holder thereof. On July 16, 2026, the reporting person converted all 351,037 shares of Series A Convertible Preferred Stock into 351,037 shares of Common Stock.

Footnote F2

These shares are held in the referenced trust for the benefit of the reporting person's child. The reporting person's spouse is the trustee of this trust. The reporting person disclaims beneficial ownership of these securities, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or any other purpose.

Footnote F3

All options to purchase Common Stock previously held by the reporting person were cancelled on July 16, 2026. As a result, the reporting person no longer holds options to purchase Common Stock.