| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| REYNO LEONARD | Chief Medical Officer | C/O C4 THERAPEUTICS, INC., 490 ARSENAL WAY #120, WATERTOWN | /s/ Shagha Russell, Attorney-in-Fact | 16 Jan 2026 | 0001528716 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CCCC | Common Stock | Sale | $22,200 | -10,000 | -6% | $2.22 | 156,382 | 16 Jan 2026 | Direct |