Seres 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 |
|---|---|---|---|---|---|---|---|
| DesRosier Thomas | See Remarks | Sale | 76 | $17.30 | $1,315 | 7,623 | Nov 15, 2025 |
| Young Teresa L. | See Remarks | Option Exercise | 132 | — | — | 9,345 | Nov 15, 2025 |
| Shaff Eric D. | — | Option Exercise | 390 | — | — | 10,999 | Nov 15, 2025 |
| Henn Matthew R | See Remarks | Option Exercise | 140 | — | — | 8,686 | Nov 15, 2025 |
| Shaff Eric D. | — | Option Exercise | 391 | — | — | 10,493 | Aug 18, 2025 |
| DesRosier Thomas | See Remarks | Option Exercise | 133 | — | — | 7,420 | Aug 18, 2025 |
| Henn Matthew R | See Remarks | Option Exercise | 141 | — | — | 4,524 | Aug 18, 2025 |
| Young Teresa L. | See Remarks | Sale | 59 | $16.65 | $982 | 5,215 | Aug 15, 2025 |
| Shaff Eric D. | CEO and President | Option Exercise | 331 | — | — | 10,322 | May 16, 2025 |
| Young Teresa L. | See Remarks | Sale | 63 | $7.28 | $459 | 5,044 | May 15, 2025 |
| DesRosier Thomas | Chief Legal Officer and EVP | Option Exercise | 111 | — | — | 7,366 | May 15, 2025 |
| Henn Matthew R | See Remarks | Sale | 77 | $7.28 | $561 | 4,383 | May 15, 2025 |
| Young Teresa L. | See Remarks | Option Exercise | 7,813 | — | — | 100,874 | Feb 18, 2025 |
| Henn Matthew R. | See Remarks | Option Exercise | 2,813 | — | — | 80,583 | Feb 18, 2025 |
| DesRosier Thomas | Chief Legal Officer and EVP | Option Exercise | 2,657 | — | — | 137,849 | Feb 18, 2025 |
| Shaff Eric D. | CEO and President | Option Exercise | 26,563 | — | — | 204,765 | Feb 15, 2025 |
| von Moltke Lisa | See Remarks | Sale | 4,416 | $0.81 | $3,577 | 39,875 | Feb 15, 2025 |
| Young Teresa L. | See Remarks | Option Exercise | 2,656 | — | — | 91,139 | Nov 18, 2024 |
| DesRosier Thomas | Chief Legal Officer and EVP | Sale | 878 | $0.54 | $474 | 135,192 | Nov 15, 2024 |
| von Moltke Lisa | See Remarks | Sale | 977 | $0.54 | $528 | 32,415 | Nov 15, 2024 |
| Henn Matthew R. | See Remarks | Sale | 927 | $0.54 | $501 | 77,770 | Nov 15, 2024 |
| Shaff Eric D. | CEO and President | Sale | 2,505 | $0.54 | $1,353 | 170,389 | Nov 15, 2024 |
| von Moltke Lisa | See Remarks | Option Exercise | 13,744 | — | — | 34,757 | Oct 28, 2024 |
| Henn Matthew R. | See Remarks | Option Exercise | 12,622 | — | — | 79,869 | Oct 28, 2024 |
| DesRosier Thomas | Chief Legal Officer and EVP | Option Exercise | 13,500 | — | — | 137,673 | Oct 28, 2024 |
| Shaff Eric D. | CEO and President | Option Exercise | 27,837 | — | — | 173,830 | Oct 28, 2024 |
| Young Teresa L. | See Remarks | Sale | 2,983 | $0.69 | $2,058 | 88,483 | Oct 27, 2024 |
| Henn Matthew R. | See Remarks | Option Exercise | 2,813 | — | — | 68,170 | Aug 16, 2024 |
| Shaff Eric D. | CEO and President | Option Exercise | 7,813 | — | — | 148,511 | Aug 16, 2024 |
| Ege David S. | See Remarks | Option Exercise | 2,969 | — | — | 78,703 | Aug 16, 2024 |
| DesRosier Thomas | Chief Legal Officer and EVP | Sale | 873 | $0.84 | $733 | 124,173 | Aug 15, 2024 |
| von Moltke Lisa | See Remarks | Sale | 973 | $0.84 | $817 | 21,013 | Aug 15, 2024 |
| Young Teresa L. | See Remarks | Sale | 728 | $0.84 | $612 | 80,106 | Aug 15, 2024 |
| Young Teresa L. | See Remarks | Sale | 24,480 | $1.08 | $26,438 | 78,178 | Aug 3, 2024 |
| von Moltke Lisa | See Remarks | Option Exercise | 2,968 | — | — | 19,956 | May 15, 2024 |
| Shaff Eric D. | CEO and President | Sale | 2,435 | $0.94 | $2,289 | 140,698 | May 15, 2024 |
| Young Teresa L. | See Remarks | Sale | 703 | $0.94 | $661 | 17,658 | May 15, 2024 |
| Henn Matthew R. | See Remarks | Option Exercise | 2,812 | — | — | 66,248 | May 15, 2024 |
| Ege David S. | See Remarks | Sale | 1,090 | $0.94 | $1,025 | 75,734 | May 15, 2024 |
| DesRosier Thomas | Chief Legal Officer and EVP | Option Exercise | 2,656 | — | — | 123,233 | May 15, 2024 |
| Shaff Eric D. | CEO and President | Option Exercise | 31,250 | — | — | 146,870 | Feb 16, 2024 |
| DesRosier Thomas | Chief Legal Officer and EVP | Sale | 3,939 | $1.08 | $4,254 | 120,577 | Feb 15, 2024 |
| Henn Matthew R. | See Remarks | Sale | 4,170 | $1.08 | $4,504 | 63,436 | Feb 15, 2024 |
| Young Teresa L. | See Remarks | Sale | 3,374 | $1.08 | $3,644 | 15,705 | Feb 15, 2024 |
| von Moltke Lisa | See Remarks | Sale | 4,400 | $1.08 | $4,752 | 16,988 | Feb 15, 2024 |
| Ege David S. | See Remarks | Sale | 5,010 | $1.08 | $5,411 | 73,856 | Feb 15, 2024 |
| Arkowitz David | Chief Financial Officer | Sale | 3,939 | $1.08 | $4,254 | 182,442 | Feb 15, 2024 |
| Young Teresa L. | See Remarks | Option Exercise | 11,361 | — | — | 11,361 | Oct 30, 2023 |
| DesRosier Thomas | Chief Legal Officer and EVP | Option Exercise | 13,501 | — | — | 118,047 | Oct 30, 2023 |
| Ege David S. | See Remarks | Option Exercise | 11,361 | — | — | 71,057 | Oct 30, 2023 |