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JC

John Cox

Insider · CEO & President · DYN

John Cox files insider transactions with the SEC as a ceo & president of Dyne Therapeutics (DYN). We hold 5 disclosed purchases and sales filed since 29 October 2010, 3 of them in the last 90 days.

  • Files forDYN
  • Disclosed buys and sells5 in all, 3 in the last 90 days
  • Last disclosure8 September 2026

Positions held

5 posts we hold — a term names its own dates; a run of filings only says when they filed
  • Filed 25 March 2024 — 8 September 2026CEO & President · Dyne Therapeutics (DYN)31 Form 4 lines · source: SEC Form 4
  • Filed 8 December 2020 — 11 August 2023Director · Sigilon Therapeutics (SGTX)8 Form 4 lines · source: SEC Form 4
  • Filed 15 November 2013 — 24 March 2020Director · Repligen (RGEN)30 Form 4 lines · source: SEC Form 4
  • Filed 14 February 2017 — 8 March 2018Chief Executive Officer · Bioverativ (BIVV)31 Form 4 lines · source: SEC Form 4
  • Filed 28 October 2010 — 1 April 2016EVP Pharmaceutical Oper & Tech · Biogen (BIIB)114 Form 4 lines · source: SEC Form 4

Everything they disclosed

120 entries, newest first — one per disclosure report, one per Form 4 line

Positions come from the unitedstates/congress-legislators roster, the Office of Government Ethics and the SEC’s Form 4 index. Every disclosed line names its own source and links the document the government published; we print what the filing says and never a price we did not read from it. Headlines and links come from the GDELT Global Knowledge Graph — the story stays with the publisher. The portrait, where we have one, is the public-domain Congressional Bioguide photograph.