Sullivan Mark Insider Trades & Stock Holdings

Chief Legal Officer · Definium Therapeutics, Inc. · Latest filing Sep 25, 2026

Sullivan Mark, Chief Legal Officer at Definium Therapeutics, Inc. has 1 Form 4 trade on file since Sep 25, 2026. Open-market activity: 0 purchases ($0) and 1 sale ($513.85K), net -$513.85K. Latest filing: disposed of 14.05K shares of $DFTX on Sep 25, 2026 at $36.57.

Trades on file

1

Open-market bought

$0

Open-market sold

$513.85K

Net open-market

-$513.85K

Latest filing

Sep 25, 2026

All insider trades by Sullivan Mark

Date	Ticker	Type	Shares	Price	Value	Owned after	ΔOwn	1W	1M	6M	Role	Filing	Story
Sep 25, 2026	$DFTX	Sell (Open-market sale) 10b5-1	14.05K	$36.57	$513.85K			+3.4%			Chief Legal Officer		—

"Buy" means shares acquired on the Form 4 (including grants and option exercises); "Sell" means shares disposed. 1W / 1M / 6M = how the stock moved after the trade.

Stocks Sullivan Mark traded

• $DFTX

Frequently asked questions

Has Sullivan Mark been buying or selling stock?

Sullivan Mark has 0 open-market purchases and 1 open-market sale on file, net -$513.85K. Grants, option exercises and tax withholding are listed separately because they are not open-market trades.

What was Sullivan Mark's latest insider trade?

disposed of 14.05K shares of $DFTX on Sep 25, 2026 at $36.57.

Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.