Mark Sullivan insider trades: Definium Therapeutics (DFTX) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Mark reports to the SEC
Open-market buys and sales
10 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Sep 25, 2026 | DFTX | ↓ Sell | 14,051 | $36.57 | $514K | Direct | Sep 29, 2026 (4d) |
| Sep 25, 2025 | MNMD | ↓ Sell | 11,278 | $9.77 | $110K | Direct | Sep 26, 2025 (1d) |
| Jun 25, 2025 | MNMD | ↓ Sell | 11,491 | $6.80 | $78K | Direct | Jun 26, 2025 (1d) |
| Mar 25, 2025 | MNMD | ↓ Sell10b5-1 | 6,576 | $6.74 | $44K | Direct | Mar 26, 2025 (1d) |
| Dec 26, 2024 | MNMD | ↓ Sell | 4,519 | $7.43 | $34K | Direct | Dec 27, 2024 (1d) |
| Sep 25, 2024 | MNMD | ↓ Sell | 4,430 | $5.98 | $26K | Direct | Sep 25, 2024 (0d) |
| Jun 25, 2024 | MNMD | ↓ Sell10b5-1 | 17,854 | $7.22 | $129K | Direct | Jun 25, 2024 (0d) |
| Mar 2, 2023 | SESN | ↓ Sell | 219,218 | $0.59 | $129K | Direct | Mar 6, 2023 (4d) |
| Feb 21, 2023 | SESN | ↓ Sell | 39,831 | $0.59 | $23K | Direct | Feb 23, 2023 (2d) |
| Dec 14, 2011 | MEDH | ↓ Sell | 4,719 | $9.26 | $44K | Direct | Jan 4, 2012 (21d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other DFTX insiders
Open-market trades in the last 12 months
About Mark Sullivan's insider trades
Mark Sullivan is Chief Legal Officer at Definium Therapeutics (DFTX). Since Dec 14, 2011, Mark has reported no open-market purchases and 10 sales worth $1.1M on SEC Form 4. In the last 12 months: 1 sale ($514K).
2 sales (15% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include grants and awards (13 filings), shares withheld for taxes (2 filings), option exercises (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every DFTX insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.