11 insiders reported 29 Form 4 transactions for Definium Therapeutics, Inc. (DFTX) over the past 18 months (most recent 2026-08-12). Recent activity: Sullivan Mark (Chief Legal Officer) Buy 62,500 shares, Roberts Brandi (Chief Financial Officer) Buy 62,500 shares, Wiley Matthew T. (Chief Commercial Officer) Buy 62,500 shares, Barrow Robert (Chief Executive Officer) Buy 375,000 shares, Karlin Daniel (Chief Medical Officer) Buy 100,000 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-12 | Sullivan Mark | Chief Legal Officer | Buy | 62,500 | $0 |
| 2026-08-12 | Roberts Brandi | Chief Financial Officer | Buy | 62,500 | $0 |
| 2026-08-12 | Wiley Matthew T. | Chief Commercial Officer | Buy | 62,500 | $0 |
| 2026-08-12 | Barrow Robert | Chief Executive Officer | Buy | 375,000 | $0 |
| 2026-08-12 | Karlin Daniel | Chief Medical Officer | Buy | 100,000 | $0 |
| 2026-06-26 | Karlin Daniel | Chief Medical Officer | Sell | 10,035 | $451,876 |
| 2026-06-26 | Sullivan Mark | Chief Legal Officer | Sell | 13,008 | $585,750 |
| 2026-06-26 | Roberts Brandi | Chief Financial Officer | Sell | 3,013 | $135,675 |
| 2026-06-26 | Wiley Matthew T. | Chief Commercial Officer | Sell | 2,867 | $129,101 |
| 2026-06-26 | Barrow Robert | Chief Executive Officer | Sell | 29,208 | $1.3M |
| 2026-06-22 | Barrow Robert | Chief Executive Officer | Buy | 375,000 | $0 |
| 2026-06-22 | Wiley Matthew T. | Chief Commercial Officer | Buy | 62,500 | $0 |
| 2026-06-22 | Sullivan Mark | Chief Legal Officer | Buy | 62,500 | $0 |
| 2026-06-22 | Karlin Daniel | Chief Medical Officer | Buy | 100,000 | $0 |
| 2026-06-22 | Roberts Brandi | Chief Financial Officer | Buy | 62,500 | $0 |
| 2026-06-15 | GRYSKA DAVID W | Director | Buy | 4,666 | $0 |
| 2026-06-15 | Krebs Andreas | Director | Buy | 4,666 | $0 |
| 2026-06-15 | Bruhn Suzanne Louise | Director | Buy | 4,666 | $0 |
| 2026-06-15 | CRYSTAL ROGER | Director | Buy | 4,666 | $0 |
| 2026-06-15 | Adsett Roger | Director | Buy | 3,555 | $0 |
| 2026-06-15 | Vallone Carol A | Director | Buy | 4,666 | $0 |
| 2026-03-26 | Sullivan Mark | Chief Legal Officer | Sell | 10,702 | $197,666 |
| 2026-03-26 | Barrow Robert | Chief Executive Officer | Sell | 24,431 | $451,241 |
| 2026-03-26 | Karlin Daniel | Chief Medical Officer | Sell | 8,018 | $148,092 |
| 2026-02-05 | Wiley Matthew T. | Chief Commercial Officer | Buy | 115,000 | $0 |
Source: SEC Form 4 filings · as of 2026-08-12