Definium Therapeutics, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Karlin Daniel | Chief Medical Officer | Sale | 5,600 | $13.15 | $73,640 | 425,025 | Dec 26, 2025 |
| Barrow Robert | Chief Executive Officer | Sale | 25,791 | $13.15 | $339,152 | 778,477 | Dec 26, 2025 |
| Sullivan Mark | Chief Legal Officer | Sale | 11,276 | $13.15 | $148,279 | 282,576 | Dec 26, 2025 |
| Sullivan Mark | Chief Legal Officer | Sale | 11,278 | $9.77 | $110,186 | 293,852 | Sep 25, 2025 |
| Barrow Robert | Chief Executive Officer | Sale | 25,797 | $9.77 | $252,037 | 804,268 | Sep 25, 2025 |
| Karlin Daniel | Chief Medical Officer | Sale | 7,704 | $9.77 | $75,268 | 430,625 | Sep 25, 2025 |
| Sullivan Mark | Chief Legal Officer | Sale | 11,491 | $6.80 | $78,139 | 305,130 | Jun 25, 2025 |
| Karlin Daniel | Chief Medical Officer | Sale | 7,848 | $6.80 | $53,366 | 438,329 | Jun 25, 2025 |
| Barrow Robert | Chief Executive Officer | Sale | 26,491 | $6.80 | $180,139 | 830,065 | Jun 25, 2025 |
| Barrow Robert | Chief Executive Officer | Sale | 21,208 | $6.74 | $142,942 | 856,556 | Mar 25, 2025 |
| Karlin Daniel | Chief Medical Officer | Sale | 6,836 | $6.74 | $46,075 | 446,177 | Mar 25, 2025 |
| Sullivan Mark | Chief Legal Officer | Sale | 6,576 | $6.74 | $44,322 | 316,621 | Mar 25, 2025 |
| Liao Carrie | Chief Accounting Officer | Sale | 2,347 | $6.74 | $15,819 | 144,923 | Mar 25, 2025 |
| Karlin Daniel | Chief Medical Officer | Award / Grant | 115,000 | — | — | 453,013 | Mar 12, 2025 |
| Barrow Robert | Chief Executive Officer | Award / Grant | 350,000 | — | — | 877,764 | Mar 12, 2025 |
| Sullivan Mark | Chief Legal Officer | Award / Grant | 150,000 | — | — | 323,197 | Mar 12, 2025 |
| Liao Carrie | Chief Accounting Officer | Award / Grant | 50,000 | — | — | 142,270 | Mar 12, 2025 |
| Barrow Robert | Chief Executive Officer | Sale | 19,106 | $7.43 | $141,958 | 526,666 | Dec 26, 2024 |
| Liao Carrie | Chief Accounting Officer | Sale | 2,273 | $7.43 | $16,888 | 97,270 | Dec 26, 2024 |
| Karlin Dan | Chief Medical Officer | Sale | 6,643 | $7.43 | $49,357 | 338,013 | Dec 26, 2024 |
| Sullivan Mark | Chief Legal Officer | Sale | 4,519 | $7.43 | $33,576 | 173,197 | Dec 26, 2024 |
| GRYSKA DAVID W | — | Purchase | 2,500 | $7.17 | $17,925 | 19,851 | Dec 5, 2024 |
| Liao Carrie | Chief Accounting Officer | Sale | 2,352 | $5.98 | $14,065 | 99,543 | Sep 25, 2024 |
| Barrow Robert | Chief Executive Officer | Sale | 19,771 | $5.98 | $118,231 | 545,772 | Sep 25, 2024 |
| Karlin Dan | Chief Medical Officer | Sale | 6,871 | $5.98 | $41,089 | 344,656 | Sep 25, 2024 |
| Sullivan Mark | Chief Legal Officer | Sale | 4,430 | $5.98 | $26,491 | 177,716 | Sep 25, 2024 |
| GRYSKA DAVID W | — | Purchase | 3,500 | $5.98 | $20,930 | 17,351 | Aug 23, 2024 |
| Halperin Wernli Miri | Executive President | Option Exercise | 50,000 | $3.70 | $185,000 | 235,000 | Aug 21, 2024 |
| Barrow Robert | Chief Executive Officer | Purchase | 500 | $6.12 | $3,060 | 565,543 | Aug 19, 2024 |
| Sullivan Mark | Chief Legal Officer | Sale | 17,854 | $7.22 | $128,906 | 182,146 | Jun 25, 2024 |
| Karlin Dan | Chief Medical Officer | Sale | 6,925 | $7.22 | $49,999 | 351,527 | Jun 25, 2024 |
| Barrow Robert | Chief Executive Officer | Sale | 15,659 | $7.22 | $113,058 | 564,543 | Jun 25, 2024 |
| Greenway Schond L. | Chief Financial Officer | Tax Withholding | 5,560 | $9.78 | $54,377 | 211,057 | Mar 25, 2024 |
| Karlin Dan | Chief Medical Officer | Sale | 6,578 | $9.50 | $62,491 | 358,452 | Mar 25, 2024 |
| Barrow Robert | Chief Executive Officer | Sale | 16,519 | $9.50 | $156,931 | 580,202 | Mar 25, 2024 |
| Karlin Dan | Chief Medical Officer | Sale | 6,774 | $3.63 | $24,590 | 365,030 | Dec 26, 2023 |
| Barrow Robert | Chief Executive Officer | Sale | 13,237 | $3.63 | $48,050 | 596,721 | Dec 26, 2023 |
| Greenway Schond L. | Chief Financial Officer | Sale | 5,652 | $3.63 | $20,517 | 216,617 | Dec 26, 2023 |
| Barrow Robert | Chief Executive Officer | Sale | 8,231 | $3.58 | $29,467 | 611,729 | Sep 25, 2023 |
| Karlin Dan | Chief Medical Officer | Sale | 3,240 | $3.58 | $11,599 | 371,804 | Sep 25, 2023 |
| Greenway Schond L. | Chief Financial Officer | Sale | 1,908 | $3.57 | $6,812 | 226,123 | Sep 25, 2023 |
| Greenway Schond L. | Chief Financial Officer | Sale | 20,000 | $3.80 | $76,000 | 228,031 | Aug 25, 2023 |
| Barrow Robert | Chief Executive Officer | Sale | 8,416 | $3.21 | $27,015 | 623,457 | Jun 27, 2023 |
| Karlin Dan | Chief Medical Officer | Sale | 2,963 | $3.21 | $9,511 | 378,722 | Jun 27, 2023 |
| Greenway Schond L. | Chief Financial Officer | Sale | 3,941 | $3.21 | $12,651 | 248,031 | Jun 27, 2023 |
| GRYSKA DAVID W | — | Award / Grant | 13,851 | — | — | 13,851 | Jun 21, 2023 |
| CRYSTAL ROGER | — | Award / Grant | 13,671 | — | — | 19,623 | Jun 21, 2023 |
| Krebs Andreas | — | Award / Grant | 13,671 | — | — | 15,107 | Jun 21, 2023 |
| Vallone Carol A | — | Award / Grant | 13,671 | — | — | 16,544 | Jun 21, 2023 |
| Bruhn Suzanne Louise | — | Award / Grant | 13,671 | — | — | 19,623 | Jun 21, 2023 |