Based on data from the past 90 days ending December 12, 2025, C4 Therapeutics's three largest insider shareholders are Director Kenneth Carl Anderson (187.89K shares), Chief Medical Officer Leonard Reyno (166.38K shares), Chief Financial Officer Kendra Adams (162.34K 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 | 187,890 | 03 Oct, 2025 | |
| Leonard Reyno | Chief Medical Officer | 166,382 | 15 Jul, 2025 |
| Kendra Adams | Chief Financial Officer | 162,342 | 19 Sep, 2025 |
| 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 | 58,629 | 03 Oct, 2025 | |
| 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 |
|---|---|---|---|---|---|---|---|---|
| 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 |
| 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 | - | - | 165,117 | D | |||
| 18 Sep, 2025 | Kendra Adams | Common Stock | A | 6,250 | $0.00 | 165,117 | D | M |
| 18 Sep, 2025 | Kendra Adams | Common Stock | D | 2,775 | $3.32 | 162,342 | D | F |
| 18 Sep, 2025 | Kendra Adams | - | - | 162,342 | D | |||
| 10 Jul, 2025 | Leonard Reyno | - | - | 166,382 | D | |||
| 10 Jul, 2025 | Leonard Reyno | Common Stock | A | 15,325 | $0.00 | 173,764 | D | M |
| 10 Jul, 2025 | Leonard Reyno | Common Stock | D | 7,382 | $1.99 | 166,382 | D | F |
| 10 Jul, 2025 | Leonard Reyno | - | - | 166,382 | D | |||
| 10 Jul, 2025 | Leonard Reyno | Common Stock | D | 7,382 | $1.99 | 166,382 | D | F |
| 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 |
| 01 Apr, 2025 | Kenneth Carl Anderson | Common Stock | A | 7,841 | $1.44 | 127,609 | D | A |
| 01 Apr, 2025 | Donna Roy Grogan | Common Stock | A | 9,581 | $1.44 | 42,280 | D | A |
| 14 Feb, 2025 | Paige Mahaney | Common Stock | A | 28,200 | $0.00 | 105,000 | D | A |
| 14 Feb, 2025 | Leonard Reyno | Common Stock | A | 87,100 | $0.00 | 178,909 | D | A |
| 14 Feb, 2025 | Mark Mossler | Common Stock | D | 1,586 | $3.18 | 18,204 | D | F |