ATAI's three largest insider shareholders as of May 04, 2026 are Cosmo Feilding-Mellen (Director, 7.70Mn shares), Cosmo Feilding-Mellen (Director, 7.66Mn shares), Christian Angermayer (Director, 559.23K 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 |
| 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 |
| 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 | Sabrina Martucci Johnson | 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 | Amir H Kalali | Stock Option | A | 103,000 | $0.00 | 103,000 | D | A |
| 21 Mar, 2025 | Sahil Kirpekar | Common Shares | D | 48,563 | $1.35 | 115,636 | D | S |
| 21 Mar, 2025 | Glenn Frank Short | Common Shares | D | 13,161 | $1.35 | 42,333 | D | S |
| 21 Mar, 2025 | Kevin James Craig | Common Shares | D | 11,563 | $1.35 | 8,437 | D | S |
| 21 Mar, 2025 | Srinivas Rao | Common Shares | D | 75,418 | $1.35 | 212,942 | D | S |
| 21 Mar, 2025 | Anne Nagengast Johnson | Common Shares | D | 33,545 | $1.35 | 140,045 | D | S |
| 14 Mar, 2025 | Kevin James Craig | Common Shares | A | 20,000 | - | 20,000 | D | M |
| 14 Mar, 2025 | Anne Nagengast Johnson | Common Shares | A | 100,000 | - | 173,590 | D | M |
| 14 Mar, 2025 | Sahil Kirpekar | Common Shares | A | 100,000 | - | 164,199 | D | M |
| 14 Mar, 2025 | Srinivas Rao | Common Shares | A | 175,000 | - | 288,360 | D | M |