As of August 29, 2026, the three largest insider holders of CMPS are Life Sciences N.V. Atai (TenPercentOwner, 6.91Mn shares), Life Sciences N.V. Atai (TenPercentOwner, 6.91Mn shares), George Jay Goldsmith (Chief Executive Officer, 6.31Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Life Sciences N.V. Atai | TenPercentOwner | 0 | 6,905,774 | 6,905,774 | 34.3% | 27 Sep, 2024 |
| 2 | Ekaterina Malievskaia | Chief Innovation Officer | 3,152,848 | 3,155,122 | 6,307,970 | 31.3% | 25 Oct, 2024 |
| 3 | George Jay Goldsmith | Chief Executive Officer | 3,155,122 | 3,152,848 | 6,307,970 | 31.3% | 25 Oct, 2024 |
| 4 | Kabir Nath | Chief Executive Officer | 361,028 | 0 | 361,028 | 1.8% | 05 Aug, 2026 |
| 5 | Teri Loxam | Chief Financial Officer | 152,002 | 0 | 152,002 | 0.8% | 27 Mar, 2026 |
| 6 | Matthew A Owens | General Counsel Clo | 43,340 | 0 | 43,340 | 0.2% | 05 Feb, 2024 |
| 7 | Michael Falvey | Chief Financial Officer | 22,500 | 0 | 22,500 | 0.1% | 03 Feb, 2023 |
| 8 | David Y Norton | Director | 20,356 | 0 | 20,356 | 0.1% | 31 Mar, 2022 |
| 9 | Annalisa Jenkins | Director | 19,480 | 0 | 19,480 | 0.1% | 05 Aug, 2024 |
| 10 | Guy Goodwin | Chief Medical Officer | 8,000 | 0 | 8,000 | 0.0% | 06 Apr, 2022 |
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 |
|---|---|---|---|---|---|---|---|---|
| 03 Aug, 2026 | Kabir Nath | Chief Executive Officer | Disposed F | 5,962 | $11.25 | $67.07K | 361,028 | Direct |
| 27 May, 2026 | Kathleen Tregoning | Director | Acquired A | 41,119 | $0.00 | $0 | 41,119 | Direct |
| 27 May, 2026 | Gino Santini | Director | Acquired A | 30,158 | $0.00 | $0 | 30,158 | Direct |
| 27 May, 2026 | Robert Mcquade | Director | Acquired A | 21,110 | $0.00 | $0 | 21,110 | Direct |
| 27 May, 2026 | David Y Norton | Director | Acquired A | 21,110 | $0.00 | $0 | 21,110 | Direct |
| 27 May, 2026 | Jeffrey M Jonas | Director | Acquired A | 21,110 | $0.00 | $0 | 21,110 | Direct |
| 27 May, 2026 | Daphne Karydas | Director | Acquired A | 21,110 | $0.00 | $0 | 21,110 | Direct |
| 26 Mar, 2026 | Kabir Nath | Chief Executive Officer | Acquired A | 175,000 | $0.00 | $0 | 366,990 | Direct |
| 26 Mar, 2026 | Guy Goodwin | Chief Medical Officer | Acquired A | 55,000 | $0.00 | $0 | 55,000 | Direct |
| 26 Mar, 2026 | Guy Goodwin | Chief Medical Officer | Acquired A | 55,000 | $0.00 | $0 | 55,000 | Direct |
| 26 Mar, 2026 | Teri Loxam | Chief Financial Officer | Acquired A | 75,000 | $0.00 | $0 | 152,002 | Direct |
| 26 Mar, 2026 | Guy Goodwin | Chief Medical Officer | Acquired A | 55,000 | $0.00 | $0 | 55,000 | Direct |
| 26 Mar, 2026 | Kabir Nath | Chief Executive Officer | Acquired A | 175,000 | $0.00 | $0 | 366,990 | Direct |
| 26 Mar, 2026 | Guy Goodwin | Chief Medical Officer | Acquired A | 55,000 | $0.00 | $0 | 55,000 | Direct |
| 26 Mar, 2026 | Kabir Nath | Chief Executive Officer | Acquired A | 175,000 | $0.00 | $0 | 366,990 | Direct |
| 26 Mar, 2026 | Kabir Nath | Chief Executive Officer | Acquired A | 175,000 | $0.00 | $0 | 366,990 | Direct |
| 26 Mar, 2026 | Kabir Nath | Chief Executive Officer | Acquired A | 367,815 | $0.00 | $0 | 367,815 | Direct |
| 26 Mar, 2026 | Kabir Nath | Chief Executive Officer | Acquired A | 367,815 | $0.00 | $0 | 367,815 | Direct |
| 26 Mar, 2026 | Kabir Nath | Chief Executive Officer | Acquired A | 367,815 | $0.00 | $0 | 367,815 | Direct |
| 26 Mar, 2026 | Guy Goodwin | Chief Medical Officer | Acquired A | 115,600 | $0.00 | $0 | 115,600 | Direct |