SYNLOGIC, 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 |
|---|---|---|---|---|---|---|---|
| Dooley Mary Beth | See Remarks below | Sale | 157 | $1.81 | $284 | 12,744 | Oct 29, 2025 |
| Shea Richard P | — | Award / Grant | 15,000 | — | — | 15,506 | Apr 26, 2025 |
| Flynn James P | — | Award / Grant | 15,000 | — | — | 15,000 | Apr 26, 2025 |
| Dooley Mary Beth | See Remarks below | Sale | 144 | $1.20 | $173 | 12,901 | Apr 2, 2025 |
| Dooley Mary Beth | See Remarks below | Sale | 2,107 | $1.33 | $2,802 | 13,045 | Feb 3, 2025 |
| Dooley Mary Beth | Head of Finance | Sale | 79 | $1.40 | $111 | 15,152 | Oct 29, 2024 |
| Dooley Mary Beth | Head of Finance | Sale | 188 | $1.73 | $325 | 15,231 | Apr 2, 2024 |
| Awad Antoine | Chief Operating Officer | Sale | 372 | $1.73 | $644 | 33,859 | Apr 2, 2024 |
| Awad Antoine | Chief Operating Officer | Sale | 6,438 | $0.58 | $3,734 | 74,732 | Apr 3, 2023 |
| Brennan Aoife | See Remarks | Sale | 19,042 | $0.58 | $11,044 | 256,301 | Apr 3, 2023 |
| JENSEN MICHAEL VANGSTED | Chief Financial Officer | Sale | 2,553 | $0.58 | $1,481 | 46,947 | Apr 3, 2023 |
| JENSEN MICHAEL VANGSTED | Chief Financial Officer | Purchase | 9,500 | $1.12 | $10,640 | 39,500 | May 24, 2022 |
| Brennan Aoife | See Remarks | Sale | 8,894 | $2.45 | $21,790 | 275,343 | Apr 4, 2022 |
| Awad Antoine | Chief Operating Officer | Sale | 2,650 | $2.45 | $6,493 | 81,170 | Apr 4, 2022 |
| JENSEN MICHAEL VANGSTED | Chief Financial Officer | Award / Grant | 30,000 | — | — | 30,000 | Mar 3, 2022 |
| Brennan Aoife | See Remarks | Award / Grant | 106,920 | — | — | 284,237 | Feb 4, 2022 |
| Awad Antoine | Chief Operating Officer | Award / Grant | 40,820 | — | — | 83,820 | Feb 4, 2022 |
| OrbiMed Capital GP VI LLC | — | Award / Grant | 1,666,666 | $3.00 | $4,999,998 | 3,696,662 | Apr 20, 2021 |
| Khuong Chau Quang | — | Award / Grant | 1,666,666 | $3.00 | $4,999,998 | 3,696,662 | Apr 20, 2021 |
| Riese Richard J. | Chief Medical Officer | Award / Grant | 17,500 | — | — | 39,000 | Mar 10, 2021 |
| Brennan Aoife | See Remarks | Award / Grant | 71,250 | — | — | 177,317 | Mar 10, 2021 |
| Awad Antoine | Chief Operating Officer | Award / Grant | 17,500 | — | — | 43,000 | Mar 10, 2021 |
| Riese Richard J. | Chief Medical Officer | Award / Grant | 13,500 | — | — | 21,500 | Mar 10, 2020 |
| Brennan Aoife | See Remarks | Award / Grant | 46,300 | — | — | 106,067 | Mar 10, 2020 |
| Shea Richard P | — | Purchase | 7,500 | $2.74 | $20,550 | 7,500 | Dec 13, 2019 |
| PLEVY SCOTT ERIC | Chief Scientific Officer | Award / Grant | 8,000 | — | — | 8,000 | Sep 23, 2019 |
| Riese Richard J. | Chief Medical Officer | Award / Grant | 8,000 | — | — | 8,000 | Sep 23, 2019 |
| Brennan Aoife | See Remarks | Award / Grant | 8,000 | — | — | 59,767 | Sep 23, 2019 |
| Miller Paul Francis | Chief Scientific Officer | Sale | 5,849 | $9.75 | $57,028 | 48,135 | Feb 12, 2019 |
| Miller Paul Francis | Chief Scientific Officer | Sale | 3,000 | $9.77 | $29,310 | 57,135 | Oct 18, 2018 |
| Miller Paul Francis | Chief Scientific Officer | Sale | 3,000 | $13.05 | $39,150 | 60,135 | Sep 18, 2018 |
| Miller Paul Francis | Chief Scientific Officer | Sale | 3,000 | $12.55 | $37,650 | 63,135 | Sep 5, 2018 |
| Miller Paul Francis | Chief Scientific Officer | Sale | 1,658 | $9.77 | $16,199 | 67,477 | Aug 30, 2018 |
| Miller Paul Francis | Chief Scientific Officer | Sale | 3,000 | $11.01 | $33,030 | 69,135 | Jul 18, 2018 |
| Miller Paul Francis | Chief Scientific Officer | Sale | 946 | $9.75 | $9,224 | 74,189 | Jun 20, 2018 |
| POWELL MICHAEL | — | Award / Grant | 150,000 | $9.75 | $1,462,500 | 574,972 | Jan 26, 2018 |
| Khuong Chau Quang | — | Award / Grant | 715,000 | $9.75 | $6,971,250 | 2,029,996 | Jan 26, 2018 |
| OrbiMed Capital GP VI LLC | — | Award / Grant | 715,000 | $9.75 | $6,971,250 | 2,029,996 | Jan 26, 2018 |
| Viswanathan Ravi | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| Sonsini Peter W. | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| SANDELL SCOTT D | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| MOTT DAVID M | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| KERINS PATRICK J | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| Florence Anthony A. Jr. | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| BASKETT FOREST | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| BARRIS PETER J | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| BARRETT M JAMES | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| NEA 14 GP, LTD | — | Award / Grant | 410,000 | $9.75 | $3,997,500 | 4,228,940 | Jan 26, 2018 |
| Gutierrez-Ramos Jose-Carlos | See Remarks | Gift | 10,000 | — | — | 352,619 | Oct 2, 2017 |
| Viswanathan Ravi | — | Award / Grant | 3,394,439 | — | — | 3,818,940 | Aug 28, 2017 |