Atai Beckley's three largest insider shareholders as of April 17, 2026 are Cosmo Feilding-Mellen (Director, 7.70Mn shares), Florian Brand (Officer, 328.70K shares), Srinivas Rao (Officer, 212.94K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Cosmo Feilding-Mellen | - | 7,702,990 | 0 | 06 Nov, 2025 |
| Florian Brand | - | 328,697 | 0 | 20 May, 2024 |
| Srinivas Rao | - | 212,942 | 0 | 24 Mar, 2025 |
| Anne Nagengast Johnson | Chief Financial Officer | 140,045 | 0 | 24 Mar, 2025 |
| Sahil Kirpekar | Chief Business Officer | 115,636 | 0 | 24 Mar, 2025 |
| Glenn Frank Short | Chief Scientific Officer | 42,333 | 0 | 24 Mar, 2025 |
| Kevin James Craig | Chief Medical Officer | 8,437 | 0 | 24 Mar, 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 |
|---|---|---|---|---|---|---|---|---|
| 25 Nov, 2025 | Cosmo Feilding-Mellen | Stock Option | D | 40,400 | $0.00 | 0 | D | D |
| 25 Nov, 2025 | Cosmo Feilding-Mellen | Stock Option | A | 10,000 | $0.00 | 10,000 | D | A |
| 05 Nov, 2025 | Cosmo Feilding-Mellen | Common Shares | A | 7,702,990 | - | 7,702,990 | D | A |
| 04 Nov, 2025 | Scott Braunstein | Stock Option | A | 56,818 | $0.00 | 56,818 | D | A |
| 05 Nov, 2025 | Cosmo Feilding-Mellen | Stock Option | A | 103,000 | $0.00 | 103,000 | D | A |
| 05 Nov, 2025 | Cosmo Feilding-Mellen | Stock Option | A | 40,400 | $0.00 | 40,400 | D | A |
| 01 Oct, 2025 | Christopher Ryan Cave Barrett | Stock Option | A | 175,000 | $0.00 | 175,000 | D | A |
| 30 Sep, 2025 | Investment Group Ltd. Apeiron | Common Shares | A | 2,367,200 | - | 53,412,414 | I | C |
| 30 Sep, 2025 | Investment Group Ltd. Apeiron | Convertible Notes | D | 147,950 | - | 0 | I | C |
| 14 Aug, 2025 | Investment Group Ltd. Apeiron | Common Shares | A | 8,675,799 | $2.19 | 51,045,214 | I | P |
| 13 Aug, 2025 | Srinivas Rao | Stock Option | A | 650,794 | $0.00 | 650,794 | D | A |
| 13 Aug, 2025 | Srinivas Rao | Stock Option | A | 217,777 | $0.00 | 217,777 | D | A |
| 26 Jun, 2025 | Amir H Kalali | Stock Option | A | 103,000 | $0.00 | 103,000 | D | A |
| 26 Jun, 2025 | Sabrina Martucci Johnson | Stock Option | A | 103,000 | $0.00 | 103,000 | D | A |
| 26 Jun, 2025 | Laurent Fischer | Stock Option | A | 103,000 | $0.00 | 103,000 | D | A |
| 26 Jun, 2025 | John Francis Hoffman | Stock Option | A | 206,000 | $0.00 | 206,000 | D | A |
| 26 Jun, 2025 | Scott Braunstein | Stock Option | A | 103,000 | $0.00 | 103,000 | D | A |
| 26 Jun, 2025 | Christian Angermayer | Stock Option | A | 103,000 | $0.00 | 103,000 | D | A |
| 02 Jun, 2025 | Christian Angermayer | Stock Option | A | 131,698 | - | 131,698 | D | A |
| 21 Mar, 2025 | Anne Nagengast Johnson | Common Shares | D | 33,545 | $1.35 | 140,045 | D | S |