As of September 09, 2026, Keros Therapeutics's top three insider holders are Management 4 G.P. (2015) Ltd. Pontifax (TenPercentOwner, 1.23Mn shares), Management 4 G.P. (2015) Ltd. Pontifax (TenPercentOwner, 1.23Mn shares), Tomer Kariv (Director, 1.23Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Management 4 G.P. (2015) Ltd. Pontifax | TenPercentOwner | 0 | 1,226,412 | 1,226,412 | 57.2% | 30 Nov, 2022 |
| 2 | Jasbir Seehra | Chief Executive Officer | 440,708 | 0 | 440,708 | 20.5% | 06 Apr, 2026 |
| 3 | Jennifer Lachey | Chief Scientific Officer | 95,100 | 0 | 95,100 | 4.4% | 19 Jul, 2022 |
| 4 | Christopher Rovaldi | Chief Operating Officer | 60,000 | 0 | 60,000 | 2.8% | 19 Feb, 2025 |
| 5 | Annita Tanini | Corp. Controller Vp, Finance | 45,144 | 0 | 45,144 | 2.1% | 20 Aug, 2026 |
| 6 | Carl L Gordon | Director | 0 | 45,057 | 45,057 | 2.1% | 18 Dec, 2025 |
| 7 | Yung H. Chyung | Chief Medical Officer | 44,000 | 0 | 44,000 | 2.1% | 19 Feb, 2025 |
| 8 | Keith Regnante | Chief Financial Officer | 39,261 | 0 | 39,261 | 1.8% | 20 Feb, 2026 |
| 9 | Esther Cho | Chief Legal Officer | 35,770 | 0 | 35,770 | 1.7% | 20 Aug, 2026 |
| 10 | Lorena Raquel Lerner | Chief Scientific Officer | 27,559 | 0 | 27,559 | 1.3% | 20 Aug, 2026 |
| 11 | Jean Jacques Bienaime | Director | 19,592 | 0 | 19,592 | 0.9% | 19 Aug, 2026 |
| 12 | Anne Prener | Director | 13,786 | 0 | 13,786 | 0.6% | 06 Jul, 2026 |
| 13 | Charles W. Newton | Director | 12,114 | 0 | 12,114 | 0.6% | 20 Aug, 2026 |
| 14 | Julius Knowles | Director | 10,958 | 0 | 10,958 | 0.5% | 08 Jun, 2026 |
| 15 | Nima Farzan | Director | 9,767 | 0 | 9,767 | 0.5% | 08 Jun, 2026 |
| 16 | Alpna Seth | Director | 9,767 | 0 | 9,767 | 0.5% | 08 Jun, 2026 |
| 17 | Mary Ann Gray | Director | 5,250 | 0 | 5,250 | 0.2% | 06 Jun, 2025 |
| 18 | Tomer Kariv | Director, TenPercentOwner | 5,250 | 0 | 5,250 | 0.2% | 06 Jun, 2025 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 18 Aug, 2026 | Charles W. Newton | Director | Disposed S | 551 | $10.30 | $5.68K | 12,114 | Direct |
| 18 Aug, 2026 | Lorena Raquel Lerner | Chief Scientific Officer | Disposed S | 3,568 | $10.29 | $36.71K | 27,559 | Direct |
| 18 Aug, 2026 | Annita Tanini | Corp. Controller Vp, Finance | Disposed S | 1,224 | $10.29 | $12.59K | 45,144 | Direct |
| 18 Aug, 2026 | Esther Cho | Chief Legal Officer | Disposed S | 4,485 | $10.29 | $46.15K | 35,770 | Direct |
| 17 Aug, 2026 | Jean Jacques Bienaime | Director | Acquired P | 1,000 | $10.27 | $10.27K | 19,592 | Direct |
| 01 Jul, 2026 | Anne Prener | Director | Acquired A | 13,786 | $0.00 | $0 | 13,786 | Direct |
| 01 Jul, 2026 | Anne Prener | Director | Acquired A | 14,870 | $0.00 | $0 | 14,870 | Direct |
| 11 Jun, 2026 | Charles W. Newton | Director | Disposed S | 550 | $10.04 | $5.52K | 12,665 | Direct |
| 04 Jun, 2026 | Alpna Seth | Director | Disposed S | 2,625 | $10.72 | $28.14K | 9,767 | Direct |
| 04 Jun, 2026 | Nima Farzan | Director | Disposed S | 2,625 | $10.73 | $28.17K | 9,767 | Direct |
| 04 Jun, 2026 | Julius Knowles | Director | Disposed S | 2,625 | $10.73 | $28.17K | 10,958 | Direct |
| 03 Jun, 2026 | Nima Farzan | Director | Acquired A | 7,142 | $0.00 | $0 | 12,392 | Direct |
| 03 Jun, 2026 | Alpna Seth | Director | Acquired A | 7,142 | $0.00 | $0 | 12,392 | Direct |
| 03 Jun, 2026 | Julius Knowles | Director | Acquired A | 7,142 | $0.00 | $0 | 13,583 | Direct |
| 03 Jun, 2026 | Mary Ann Gray | Director | Acquired A | 7,142 | $0.00 | $0 | 12,392 | Direct |
| 03 Jun, 2026 | Mary Ann Gray | Director | Acquired A | 7,433 | $0.00 | $0 | 7,433 | Direct |
| 03 Jun, 2026 | Alpna Seth | Director | Acquired A | 7,433 | $0.00 | $0 | 7,433 | Direct |
| 03 Jun, 2026 | Nima Farzan | Director | Acquired A | 7,433 | $0.00 | $0 | 7,433 | Direct |
| 03 Jun, 2026 | Julius Knowles | Director | Acquired A | 7,433 | $0.00 | $0 | 7,433 | Direct |
| 15 May, 2026 | Jean Jacques Bienaime | Director | Acquired P | 1,000 | $10.58 | $10.58K | 9,450 | Direct |