As of April 17, 2026, the three largest insider holders of ATRA are Capital Fund I Lp Adiumentum (Director, 1.21Mn shares), Innovation Ltd Panacea (TenPercentOwner, 307.89K shares), Charlene A. Banard (Evp, Chief Technical Officer, 276.01K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Capital Fund I Lp Adiumentum | - | 1,209,395 | 0 | 16 May, 2025 |
| Innovation Ltd Panacea | - | 0 | 307,894 | 19 Mar, 2026 |
| Charlene A. Banard | Evp, Chief Technical Officer | 276,010 | 0 | 18 May, 2023 |
| Utpal Koppikar | Chief Financial Officer | 181,978 | 0 | 06 Mar, 2023 |
| Kristin Yarema | Chief Commercial Officer | 171,415 | 0 | 03 Mar, 2022 |
| Anhco Nguyen | President And Ceo | 143,078 | 0 | 11 Mar, 2026 |
| Joe Newell | Chief Operations Officer | 113,097 | 0 | 18 Nov, 2021 |
| Pascal Touchon | President And Ceo | 77,955 | 0 | 12 Jun, 2025 |
| Yanina Grant-Huerta | Chief Accounting Officer | 52,050 | 0 | 11 Mar, 2026 |
| Carol Giltner Gallagher | - | 33,012 | 0 | 12 Jun, 2025 |
| Ronald C Jr Renaud | - | 31,500 | 0 | 27 Jun, 2022 |
| Amar Murugan | Evp, Chief Legal Officer | 26,827 | 0 | 20 Aug, 2024 |
| Jill Henrich | Evp, Chief Regulatory Officer | 18,679 | 0 | 05 Mar, 2025 |
| Matthew K Fust | - | 18,188 | 0 | 12 Jun, 2025 |
| Maria Grazia Roncarolo | - | 17,368 | 0 | 12 Jun, 2025 |
| Ameet Mallik | - | 16,928 | 0 | 12 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 |
|---|---|---|---|---|---|---|---|---|
| 17 Mar, 2026 | Innovation Ltd Panacea | Common Stock | A | 259,163 | $0.00 | 307,899 | I | M |
| 17 Mar, 2026 | Innovation Ltd Panacea | Common Stock | D | 5 | $5.23 | 307,894 | I | F |
| 17 Mar, 2026 | Innovation Ltd Panacea | Warrants | D | 259,163 | $6.61 | 0 | I | M |
| 09 Mar, 2026 | Yanina Grant-Huerta | Common Stock | A | 20,300 | $0.00 | 52,050 | D | A |
| 09 Mar, 2026 | Anhco Nguyen | Common Stock | A | 81,100 | $0.00 | 143,078 | D | A |
| 02 Mar, 2026 | Anhco Nguyen | Common Stock | D | 198 | $5.08 | 64,776 | D | S |
| 02 Mar, 2026 | Yanina Grant-Huerta | Common Stock | D | 24 | $5.08 | 33,830 | D | S |
| 02 Mar, 2026 | Anhco Nguyen | Common Stock | D | 58 | $5.08 | 64,718 | D | S |
| 02 Mar, 2026 | Yanina Grant-Huerta | Common Stock | D | 1,603 | $5.08 | 32,227 | D | S |
| 02 Mar, 2026 | Yanina Grant-Huerta | Common Stock | D | 377 | $5.08 | 31,850 | D | S |
| 02 Mar, 2026 | Anhco Nguyen | Common Stock | D | 1,298 | $5.09 | 63,420 | D | S |
| 02 Mar, 2026 | Anhco Nguyen | Common Stock | D | 1,442 | $5.09 | 61,978 | D | S |
| 02 Mar, 2026 | Yanina Grant-Huerta | Common Stock | D | 100 | $5.08 | 31,750 | D | S |
| 12 Jan, 2026 | Innovation Ltd Panacea | Common Stock | D | 80,554 | $6.07 | 1,324,446 | I | S |
| 28 Nov, 2025 | Innovation Ltd Panacea | Common Stock | A | 48,737 | $0.00 | 48,737 | I | M |
| 28 Nov, 2025 | Innovation Ltd Panacea | Common Stock | D | 1 | $14.03 | 48,736 | I | F |
| 28 Nov, 2025 | Innovation Ltd Panacea | Warrants | D | 48,737 | $6.61 | 259,163 | I | M |
| 17 Nov, 2025 | Anhco Nguyen | Common Stock | D | 2,859 | $13.19 | 65,030 | D | S |
| 17 Nov, 2025 | Yanina Grant-Huerta | Common Stock | D | 1,645 | $13.19 | 33,613 | D | S |
| 17 Nov, 2025 | Yanina Grant-Huerta | Common Stock | D | 85 | $13.19 | 33,528 | D | S |