In the last 12 months, insiders at C4 Therapeutics made open-market sales of $22,200 (10K shares) and bought no shares on the open market.
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Andrew Hirsch | President Ceo | 1,074,934 | 0 | 1,074,934 | 32.3% | 18 Feb, 2026 |
| 2 | Kendra Adams | Chief Financial Officer | 382,323 | 0 | 382,323 | 11.5% | 21 Sep, 2026 |
| 3 | Leonard Reyno | Chief Medical Officer | 372,406 | 0 | 372,406 | 11.2% | 13 Jul, 2026 |
| 4 | Paige Mahaney | Chief Scientific Officer | 336,910 | 0 | 336,910 | 10.1% | 18 Feb, 2026 |
| 5 | Kelly Schick | Chief People Officer | 299,881 | 0 | 299,881 | 9.0% | 18 Feb, 2026 |
| 6 | Scott N Boyle | Chief Business Officer | 298,801 | 0 | 298,801 | 9.0% | 18 Feb, 2026 |
| 7 | Stewart Fisher | Chief Scientific Officer | 130,710 | 0 | 130,710 | 3.9% | 17 Sep, 2024 |
| 8 | Jolie Siegel | Chief Legal Officer | 107,939 | 0 | 107,939 | 3.2% | 18 Feb, 2025 |
| 9 | Donna Roy Grogan | Director | 79,471 | 0 | 79,471 | 2.4% | 02 Oct, 2026 |
| 10 | Kenneth Carl Anderson | Director | 75,612 | 0 | 75,612 | 2.3% | 02 Oct, 2026 |
| 11 | Mark Mossler | Chief Accounting Officer | 71,916 | 0 | 71,916 | 2.2% | 18 Feb, 2026 |
| 12 | Lauren White | Chief Financial Officer | 32,686 | 0 | 32,686 | 1.0% | 31 Aug, 2023 |
| 13 | Glenn Dubin | Director | 22,075 | 0 | 22,075 | 0.7% | 02 Apr, 2024 |
| 14 | Adam Crystal | Chief Medical Officer | 20,097 | 0 | 20,097 | 0.6% | 01 Feb, 2023 |
| 15 | Malcolm Salter | Director | 11,380 | 0 | 11,380 | 0.3% | 18 Jan, 2022 |
| 16 | Utpal Koppikar | Director | 5,667 | 0 | 5,667 | 0.2% | 10 Feb, 2023 |
| 17 | Marc A Cohen | Director | 1,118 | 0 | 1,118 | 0.0% | 18 Jan, 2022 |
| 18 | Alain J Cohen | Director | 928 | 0 | 928 | 0.0% | 05 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 |
|---|---|---|---|---|---|---|---|---|
| 01 Oct, 2026 | Kenneth Carl Anderson | Director | Acquired A | 3,662 | $3.14 | $11.50K | 75,612 | Direct |
| 01 Oct, 2026 | Donna Roy Grogan | Director | Acquired A | 4,618 | $3.14 | $14.50K | 79,471 | Direct |
| 18 Sep, 2026 | Kendra Adams | Chief Financial Officer | Acquired M | 6,250 | $0.00 | $0 | 385,098 | Direct |
| 18 Sep, 2026 | Kendra Adams | Chief Financial Officer | Disposed F | 2,775 | $3.39 | $9.41K | 382,323 | Direct |
| 10 Jul, 2026 | Leonard Reyno | Chief Medical Officer | Acquired M | 15,325 | $0.00 | $0 | 379,803 | Direct |
| 10 Jul, 2026 | Leonard Reyno | Chief Medical Officer | Disposed F | 7,397 | $4.06 | $30.03K | 372,406 | Direct |
| 01 Jul, 2026 | Donna Roy Grogan | Director | Acquired A | 3,341 | $4.34 | $14.50K | 74,853 | Direct |
| 01 Jul, 2026 | Kenneth Carl Anderson | Director | Acquired A | 2,650 | $4.34 | $11.50K | 71,950 | Direct |
| 24 Jun, 2026 | Kenneth Carl Anderson | Director | Acquired A | 62,000 | $0.00 | $0 | 62,000 | Direct |
| 24 Jun, 2026 | Donna Roy Grogan | Director | Acquired A | 62,000 | $0.00 | $0 | 62,000 | Direct |
| 24 Jun, 2026 | Utpal Koppikar | Director | Acquired A | 62,000 | $0.00 | $0 | 62,000 | Direct |
| 24 Jun, 2026 | Ronald Harold Wilfred Cooper | Director | Acquired A | 62,000 | $0.00 | $0 | 62,000 | Direct |
| 24 Jun, 2026 | Steven L. Hoerter | Director | Acquired A | 62,000 | $0.00 | $0 | 62,000 | Direct |
| 24 Jun, 2026 | Laura Bessen | Director | Acquired A | 62,000 | $0.00 | $0 | 62,000 | Direct |
| 24 Jun, 2026 | Stephen Fawell | Director | Acquired A | 62,000 | $0.00 | $0 | 62,000 | Direct |
| 24 Jun, 2026 | Owen Hughes | Director | Acquired A | 62,000 | $0.00 | $0 | 62,000 | Direct |
| 01 Jun, 2026 | Kenneth Carl Anderson | Director | Acquired M | 1,070 | $2.11 | $2.26K | 69,300 | Direct |
| 01 Jun, 2026 | Kenneth Carl Anderson | Director | Disposed M | 1,070 | $0.00 | $0 | 0 | Direct |
| 01 Apr, 2026 | Kenneth Carl Anderson | Director | Acquired A | 4,259 | $2.70 | $11.50K | 68,230 | Direct |
| 01 Apr, 2026 | Donna Roy Grogan | Director | Acquired A | 5,370 | $2.70 | $14.50K | 71,512 | Direct |