Cox John — SEC Form 4 Insider Trading Activity

Summary

Updated Jul 16, 2026

Cox John has filed 2 SEC Form 4 filings across 1 company in the last 90 days — active on both sides. Lifetime open-market purchases: $911K. Lifetime open-market sales: $241K.

Profile

John Cox is the CEO and President of Dyne Therapeutics, Inc., a clinical-stage company focused on developing therapeutics for genetically driven neuromuscular diseases. He has been involved in the company since its early stages and has a background in advancing biopharmaceutical innovations.

Board memberships

• Dyne Therapeutics, Inc.

Awards & honors

• Led Dyne Therapeutics as CEO
• Focused on neuromuscular disease therapeutics
• Advocated for innovative drug delivery systems

Recent Transactions

Companies — Last 90 Days

• Dyne Therapeutics, Inc. (DYN) — 2 filings, last 2026-06-17

Frequently Asked Questions

Who is Cox John?

John Cox is the CEO and President of Dyne Therapeutics, Inc., a clinical-stage company focused on developing therapeutics for genetically driven neuromuscular diseases. He has been involved in the company since its early stages and has a background in advancing biopharmaceutical innovations.…

How many SEC Form 4 filings has Cox John submitted recently?

2 primary Form 4 filings in the last 90 days, covering 1 company.

Has Cox John been buying or selling stock?

Recorded transactions: 1 open-market purchases ($911K) and 5 open-market sales ($241K) across all tracked filings.

Where can I see all of Cox John's SEC filings?

All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.

Learn More

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