Mark Sullivan

Mark Sullivan is a declared insider at 2 companies; the most frequent names are Definium Therapeutics, Inc. and Sesen Bio, Inc. Between 18 February 2022 and 25 September 2026, the trades on record add up to 23 filings.

Sales make up the whole of the open-market record (14 sales, €1.8M). The rest of the record consists of 7 share grants and 2 option exercises. Since January 2026: no purchases and 3 sales on the market.

The record was last updated on 29 September 2026 with an open-market sale (€452k) in Definium Therapeutics, Inc. Between a trade and the moment it shows up on SEC (Form 4), the median delay is 2 days. US insiders must file a Form 4 within two business days of a trade. Sales are harder to read than purchases, since they often meet personal needs such as tax or diversification. This summary is built from SEC (Form 4) disclosures alone and does not predict where the share price will go.