Biomea Fusion's three largest insider shareholders as of September 17, 2026 are Bihua Chen (Director, 3.57Mn shares), Pharmaceuticals, Inc. A2A (TenPercentOwner, 3.50Mn shares), Rainer M Erdtmann (President And Coo, 723.03K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Bihua Chen | Director, TenPercentOwner | 0 | 3,570,872 | 3,570,872 | 44.9% | 03 Apr, 2023 |
| 2 | Pharmaceuticals, Inc. A2A | TenPercentOwner | 3,500,000 | 0 | 3,500,000 | 44.0% | 02 Jun, 2023 |
| 3 | Rainer M Erdtmann | President And Coo | 723,027 | 0 | 723,027 | 9.1% | 15 Dec, 2025 |
| 4 | Michael J.M. Hitchcock | Interim Ceo | 115,000 | 0 | 115,000 | 1.4% | 04 Dec, 2025 |
| 5 | Franco Valle | Chief Financial Officer | 42,995 | 0 | 42,995 | 0.5% | 02 Dec, 2024 |
| 6 | Juan Pablo Frias | Chief Medical Officer | 349 | 0 | 349 | 0.0% | 12 Jun, 2024 |
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 |
|---|---|---|---|---|---|---|---|---|
| 10 Jun, 2026 | Julianne Averill | Director | Acquired A | 173,711 | $0.00 | $0 | 173,711 | Direct |
| 10 Jun, 2026 | Elizabeth Faust | Director | Acquired A | 196,299 | $0.00 | $0 | 196,299 | Direct |
| 10 Jun, 2026 | Sumita Ray | Director | Acquired A | 196,299 | $0.00 | $0 | 196,299 | Direct |
| 10 Jun, 2026 | Eric Aguiar | Director | Acquired A | 196,299 | $0.00 | $0 | 196,299 | Direct |
| 01 Apr, 2026 | Michael J.M. Hitchcock | Interim Ceo | Acquired A | 667,477 | $0.00 | $0 | 667,477 | Direct |
| 01 Apr, 2026 | Rainer M Erdtmann | Director, Officer | Acquired A | 452,512 | $0.00 | $0 | 452,512 | Direct |
| 11 Dec, 2025 | Rainer M Erdtmann | Director, Officer | Acquired P | 30,000 | $1.43 | $43.00K | 723,027 | Direct |
| 02 Dec, 2025 | Michael J.M. Hitchcock | Interim Ceo | Acquired P | 100,000 | $0.99 | $99.18K | 115,000 | Direct |
| 28 Nov, 2025 | Rainer M Erdtmann | Director, Officer | Acquired P | 40,000 | $1.10 | $44.05K | 683,027 | Direct |
| 01 Dec, 2025 | Rainer M Erdtmann | Director, Officer | Acquired P | 10,000 | $1.05 | $10.50K | 693,027 | Direct |
| 11 Aug, 2025 | Michael J.M. Hitchcock | Interim Ceo | Acquired A | 916,434 | $0.00 | $0 | 916,434 | Direct |
| 22 Jul, 2025 | Julianne Averill | Director | Acquired A | 241,177 | $0.00 | $0 | 241,177 | Direct |
| 11 Jun, 2025 | Elizabeth Faust | Director | Acquired A | 91,970 | $0.00 | $0 | 91,970 | Direct |
| 11 Jun, 2025 | Eric Aguiar | Director | Acquired A | 91,970 | $0.00 | $0 | 91,970 | Direct |
| 11 Jun, 2025 | Sumita Ray | Director | Acquired A | 91,970 | $0.00 | $0 | 91,970 | Direct |
| 11 Jun, 2025 | Bihua Chen | Director, TenPercentOwner | Acquired A | 91,970 | $0.00 | $0 | 91,970 | Direct |
| 26 Mar, 2025 | Michael J.M. Hitchcock | Interim Ceo | Acquired A | 350,000 | $0.00 | $0 | 350,000 | Direct |
| 30 Nov, 2024 | Franco Valle | Chief Financial Officer | Acquired A | 495 | $6.15 | $3.05K | 42,995 | Direct |
| 30 Sep, 2024 | Michael J.M. Hitchcock | Director | Acquired P | 10,000 | $10.06 | $100.60K | 15,000 | Direct |
| 12 Jun, 2024 | Eric Aguiar | Director | Acquired A | 51,025 | $0.00 | $0 | 51,025 | Direct |