As of April 22, 2026, C4 Therapeutics's top three insider holders are Andrew Hirsch (President Ceo, 1.07Mn shares), Elena Prokupets (Director, 534.81K shares), Kendra Adams (Chief Financial Officer, 385.10K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Andrew Hirsch | President Ceo | 1,074,934 | 0 | 18 Feb, 2026 |
| Elena Prokupets | - | 0 | 534,807 | 29 Sep, 2021 |
| Kendra Adams | Chief Financial Officer | 385,098 | 0 | 18 Feb, 2026 |
| Leonard Reyno | Chief Medical Officer | 379,803 | 0 | 18 Feb, 2026 |
| Paige Mahaney | Chief Scientific Officer | 336,910 | 0 | 18 Feb, 2026 |
| Kelly Schick | Chief People Officer | 299,881 | 0 | 18 Feb, 2026 |
| Scott N Boyle | Chief Business Officer | 298,801 | 0 | 18 Feb, 2026 |
| Stewart Fisher | Chief Scientific Officer | 130,710 | 0 | 17 Sep, 2024 |
| Jolie Siegel | Chief Legal Officer | 107,939 | 0 | 18 Feb, 2025 |
| Mark Mossler | Chief Accounting Officer | 71,916 | 0 | 18 Feb, 2026 |
| Kenneth Carl Anderson | - | 68,230 | 0 | 03 Apr, 2026 |
| Lauren White | Chief Financial Officer | 32,686 | 0 | 31 Aug, 2023 |
| Malcolm Salter | - | 11,380 | 0 | 18 Jan, 2022 |
| Utpal Koppikar | - | 5,667 | 0 | 10 Feb, 2023 |
| Marc A Cohen | - | 1,118 | 0 | 18 Jan, 2022 |
| Alain J Cohen | - | 928 | 0 | 05 Apr, 2022 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 01 Apr, 2026 | Kenneth Carl Anderson | Common Stock | A | 4,259 | $2.70 | 68,230 | D | A |
| 13 Feb, 2026 | Kendra Adams | Common Stock | A | 240,000 | $0.00 | 402,342 | D | A |
| 13 Feb, 2026 | Paige Mahaney | Common Stock | A | 240,000 | $0.00 | 339,356 | D | A |
| 13 Feb, 2026 | Kelly Schick | Common Stock | A | 200,000 | $0.00 | 308,885 | D | A |
| 13 Feb, 2026 | Scott N Boyle | Common Stock | A | 200,000 | $0.00 | 307,805 | D | A |
| 13 Feb, 2026 | Andrew Hirsch | Common Stock | A | 700,000 | $0.00 | 1,123,145 | D | A |
| 13 Feb, 2026 | Leonard Reyno | Common Stock | A | 240,000 | $0.00 | 396,382 | D | A |
| 13 Feb, 2026 | Mark Mossler | Common Stock | A | 56,980 | $0.00 | 75,184 | D | A |
| 14 Feb, 2026 | Paige Mahaney | Common Stock | A | 7,050 | $0.00 | 339,356 | D | M |
| 14 Feb, 2026 | Mark Mossler | Common Stock | A | 9,420 | $0.00 | 75,184 | D | M |
| 14 Feb, 2026 | Leonard Reyno | Common Stock | A | 30,950 | $0.00 | 396,382 | D | M |
| 13 Feb, 2026 | Kelly Schick | Common Stock | A | 5,000 | $0.00 | 308,885 | D | M |
| 14 Feb, 2026 | Andrew Hirsch | Common Stock | A | 81,725 | $0.00 | 1,123,145 | D | M |
| 13 Feb, 2026 | Scott N Boyle | Common Stock | A | 5,000 | $0.00 | 307,805 | D | M |
| 13 Feb, 2026 | Kendra Adams | Common Stock | A | 3,750 | $0.00 | 402,342 | D | M |
| 13 Feb, 2026 | Kelly Schick | Common Stock | D | 1,735 | $1.89 | 307,150 | D | F |
| 14 Feb, 2026 | Leonard Reyno | Common Stock | D | 16,579 | $1.89 | 379,803 | D | F |
| 14 Feb, 2026 | Andrew Hirsch | Common Stock | D | 39,154 | $1.89 | 1,083,991 | D | F |
| 14 Feb, 2026 | Mark Mossler | Common Stock | D | 3,268 | $1.89 | 71,916 | D | F |
| 14 Feb, 2026 | Paige Mahaney | Common Stock | D | 2,446 | $1.89 | 336,910 | D | F |