As of March 23, 2026, the three largest insider holders of KROS are Ran Nussbaum (Director, 1.23Mn shares), Tomer Kariv (Director, 1.23Mn shares), Jasbir Seehra (Chief Executive Officer, 385.71K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Ran Nussbaum | 0 | 1,226,412 | 30 Nov, 2022 | |
| Tomer Kariv | 0 | 1,226,412 | 30 Nov, 2022 | |
| Jasbir Seehra | Chief Executive Officer | 385,708 | 0 | 20 Feb, 2026 |
| Julius Knowles | 0 | 102,233 | 18 Dec, 2025 | |
| Jennifer Lachey | Chief Scientific Officer | 95,100 | 0 | 19 Jul, 2022 |
| Christopher Rovaldi | Chief Operating Officer | 60,000 | 0 | 19 Feb, 2025 |
| Advisors Llc Orbimed | 0 | 45,057 | 18 Dec, 2025 | |
| Yung H. Chyung | Chief Medical Officer | 44,000 | 0 | 19 Feb, 2025 |
| Esther Cho | Svp, General Counsel | 39,755 | 0 | 20 Feb, 2026 |
| Keith Regnante | Chief Financial Officer | 39,261 | 0 | 20 Feb, 2026 |
| Lorena Raquel Lerner | Chief Science Officer | 31,127 | 0 | 20 Feb, 2026 |
| Charles W. Newton | 13,215 | 0 | 11 Mar, 2026 | |
| Jean Jacques Bienaime | 7,450 | 0 | 11 Mar, 2026 | |
| Julius Knowles | 6,441 | 0 | 06 Jun, 2025 | |
| Alpna Seth | 5,250 | 0 | 06 Jun, 2025 | |
| Ran Nussbaum | 5,250 | 0 | 06 Jun, 2025 | |
| Nima Farzan | 5,250 | 0 | 06 Jun, 2025 | |
| Tomer Kariv | 5,250 | 0 | 06 Jun, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 09 Mar, 2026 | Charles W. Newton | Common Stock | A | 13,215 | $0.00 | 13,215 | D | A |
| 09 Mar, 2026 | Jean Jacques Bienaime | Common Stock | A | 2,000 | $11.21 | 7,450 | D | P |
| 09 Mar, 2026 | Charles W. Newton | Stock Option (Right to Buy) | A | 14,788 | $0.00 | 14,788 | D | A |
| 24 Feb, 2026 | Jasbir Seehra | Employee Stock Option (Right to Buy) | A | 217,000 | $0.00 | 217,000 | D | A |
| 24 Feb, 2026 | Esther Cho | Employee Stock Option (Right to Buy) | A | 80,000 | $0.00 | 80,000 | D | A |
| 24 Feb, 2026 | Keith Regnante | Employee Stock Option (Right to Buy) | A | 60,000 | $0.00 | 60,000 | D | A |
| 24 Feb, 2026 | Lorena Raquel Lerner | Employee Stock Option (Right to Buy) | A | 75,000 | $0.00 | 75,000 | D | A |
| 24 Feb, 2026 | Jasbir Seehra | Employee Stock Option (right to buy) | A | 100,000 | $0.00 | 100,000 | D | A |
| 18 Feb, 2026 | Lorena Raquel Lerner | Common Stock | D | 3,873 | $16.35 | 31,127 | D | S |
| 19 Feb, 2026 | Jasbir Seehra | Common Stock | D | 7,015 | $16.17 | 385,708 | D | S |
| 18 Feb, 2026 | Keith Regnante | Common Stock | D | 4,739 | $16.35 | 39,261 | D | S |
| 18 Feb, 2026 | Esther Cho | Common Stock | D | 4,745 | $16.35 | 39,755 | D | S |
| 07 Jan, 2026 | Jasbir Seehra | Employee Stock Option (right to buy) | A | 62,500 | $0.00 | 62,500 | D | A |
| 21 Nov, 2025 | Julius Knowles | Common Stock | D | 191,527 | $17.75 | 150,047 | I | D |
| 21 Nov, 2025 | Advisors Llc Orbimed | Common Stock | D | 140,057 | $17.75 | 759,155 | I | D |
| 21 Nov, 2025 | Julius Knowles | Common Stock | D | 130,494 | $17.75 | 102,233 | I | D |
| 21 Nov, 2025 | Advisors Llc Orbimed | Common Stock | D | 74,465 | $17.75 | 45,057 | I | D |
| 15 Oct, 2025 | Management 4 G.P. (2015) Ltd. Pontifax | Common Stock, $0.0001 par value per share | D | 2,284,612 | $17.75 | 0 | I | S |
| 15 Oct, 2025 | Management 4 G.P. (2015) Ltd. Pontifax | Common Stock, $0.0001 par value per share | D | 1,121,045 | $17.75 | 0 | I | S |
| 15 Oct, 2025 | Management 4 G.P. (2015) Ltd. Pontifax | Common Stock, $0.0001 par value per share | D | 1,226,412 | $17.75 | 0 | I | S |