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DYNDyne Therapeutics, Inc.

John Cox

CEO & President, Director at Dyne Therapeutics, Inc., as of Sep 8, 2026Sold $444K of stock in the past 12 months: 100% under a disclosed plan.

Updated Oct 15, 2026 from SEC filings · covers Oct 16, 2025 to Oct 15, 2026
14%
share of stake sold at Dyne Therapeutics, Inc.
190K
shares held after the latest filing, Dyne Therapeutics, Inc.
Vested shares reported on Forms 3, 4 and 5 only. Not the insider's whole wealth.
2
companies filed for

Selling by month

Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.

Disclosed planOne dollar scale for every month; the tallest bar is labeled
OctNovDec 2025: $55K under a disclosed planDecJanFebMar 2026: $41K under a disclosed planMarAprMay 2026: $61K under a disclosed planMayJun 2026: $49K under a disclosed planJunJulAug 2026: $131K under a disclosed plan$131KAugSep 2026: $107K under a disclosed planSepOct

Pattern

What the filings show, past 12 months. Nothing here rates or predicts.

Roles from filings

Every company we track where this person has filed, newest filing first.

CompanyTitleFirst filingLatest filing
Dyne Therapeutics, Inc. (DYN)CEO & President, DirectorMar 27, 2024Sep 8, 2026
Biogen (BIIB)Former EVP Pharmaceutical Oper & TechAug 10, 2010Apr 5, 2016

Recent filings

The last 5 days with transactions, newest first, one line per trade date. Each number links to an SEC filing.

This page shows only what this person reported on SEC ownership filings. See the methodology. Spotted something wrong? Report an error.