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Mark Sullivan

Insider · Chief Legal Officer · DFTX

Mark Sullivan files insider transactions with the SEC as a chief legal officer of Definium Therapeutics (DFTX). We hold 2 disclosed purchases and sales filed since 11 July 2011, 1 of them in the last 90 days.

  • Files forDFTX
  • Disclosed buys and sells2 in all, 1 in the last 90 days
  • Last disclosure12 August 2026

Positions held

4 posts we hold — a term names its own dates; a run of filings only says when they filed
  • Filed 3 February 2026 — 12 August 2026Chief Legal Officer · Definium Therapeutics (DFTX)7 Form 4 lines · source: SEC Form 4
  • Filed 13 April 2023 — 26 December 2025Chief Legal Officer · Mind Medicine (MindMed) (MNMD)10 Form 4 lines · source: SEC Form 4
  • Filed 1 August 2019 — 2 March 2023General Counsel & Secretary · Sesen Bio (SESN)10 Form 4 lines · source: SEC Form 4
  • Filed 11 July 2011 — 14 December 2011Gen Counsel, CCO & Secretary · MedQuist Holdings (MEDH)8 Form 4 lines · source: SEC Form 4

Everything they disclosed

35 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.