Through the 90-day period concluding January 21, 2026, C4 Therapeutics's top three insider stakeholders include Director Marc A Cohen (1.88Mn shares), Director Alain J Cohen (1.74Mn shares), Director Elena Prokupets (503.13K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Marc A Cohen | 1,875,923 | 18 Jan, 2022 | |
| Alain J Cohen | 1,742,858 | 05 Apr, 2022 | |
| Elena Prokupets | 503,126 | 29 Sep, 2021 | |
| Andrew Hirsch | President & Ceo | 423,145 | 18 Feb, 2025 |
| Kenneth Carl Anderson | 193,848 | 05 Jan, 2026 | |
| Kendra Adams | Chief Financial Officer | 162,342 | 19 Sep, 2025 |
| Leonard Reyno | Chief Medical Officer | 156,382 | 16 Jan, 2026 |
| Stewart Fisher | Chief Scientific Officer | 130,710 | 17 Sep, 2024 |
| Kelly Schick | Chief People Officer | 108,885 | 18 Feb, 2025 |
| Jolie Siegel | Chief Legal Officer | 107,939 | 18 Feb, 2025 |
| Scott N Boyle | Chief Business Officer | 107,805 | 18 Feb, 2025 |
| Paige Mahaney | Chief Scientific Officer | 99,356 | 30 Oct, 2025 |
| Donna Roy Grogan | 66,142 | 05 Jan, 2026 | |
| Lauren White | Chief Financial Officer | 32,686 | 31 Aug, 2023 |
| Glenn Dubin | 22,075 | 02 Apr, 2024 | |
| Adam Crystal | Chief Medical Officer | 20,097 | 01 Feb, 2023 |
| Mark Mossler | Chief Accounting Officer | 18,204 | 18 Feb, 2025 |
| Malcolm Salter | 11,380 | 18 Jan, 2022 | |
| Utpal Koppikar | 5,667 | 10 Feb, 2023 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 16 Jan, 2026 | Leonard Reyno | Common Stock | D | 10,000 | $2.22 | 156,382 | D | S |
| 02 Jan, 2026 | Donna Roy Grogan | Common Stock | A | 7,513 | $1.93 | 66,142 | D | A |
| 02 Jan, 2026 | Kenneth Carl Anderson | Common Stock | A | 5,958 | $1.93 | 146,532 | D | A |
| 28 Oct, 2025 | Paige Mahaney | Common Stock | A | 19,200 | $0.00 | 105,000 | D | M |
| 28 Oct, 2025 | Paige Mahaney | Common Stock | D | 5,644 | $2.58 | 99,356 | D | F |
| 28 Oct, 2025 | Paige Mahaney | - | - | 105,000 | D | |||
| 28 Oct, 2025 | Paige Mahaney | - | - | 99,356 | D | |||
| 01 Oct, 2025 | Donna Roy Grogan | Common Stock | A | 6,740 | $2.15 | 58,629 | D | A |
| 01 Oct, 2025 | Kenneth Carl Anderson | Common Stock | A | 5,349 | $2.15 | 140,574 | D | A |
| 18 Sep, 2025 | Kendra Adams | - | - | 162,342 | D | |||
| 18 Sep, 2025 | Kendra Adams | - | - | 165,117 | D | |||
| 18 Sep, 2025 | Kendra Adams | Common Stock | D | 2,775 | $3.32 | 162,342 | D | F |
| 18 Sep, 2025 | Kendra Adams | Common Stock | A | 6,250 | $0.00 | 165,117 | D | M |
| 10 Jul, 2025 | Leonard Reyno | Common Stock | D | 7,382 | $1.99 | 166,382 | D | F |
| 10 Jul, 2025 | Leonard Reyno | Common Stock | D | 7,382 | $1.99 | 166,382 | D | F |
| 10 Jul, 2025 | Leonard Reyno | Common Stock | A | 15,325 | $0.00 | 173,764 | D | M |
| 10 Jul, 2025 | Leonard Reyno | - | - | 166,382 | D | |||
| 10 Jul, 2025 | Leonard Reyno | - | - | 166,382 | D | |||
| 01 Jul, 2025 | Donna Roy Grogan | Common Stock | A | 9,609 | $1.51 | 51,889 | D | A |
| 01 Jul, 2025 | Kenneth Carl Anderson | Common Stock | A | 7,616 | $1.51 | 135,225 | D | A |