| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Katkin Keith | Director | C/O SYNDAX PHARMACEUTICALS, INC., 730 THIRD AVENUE, FLOOR 9, NEW YORK | /s/ Michael A. Metzger, as Attorney-in-Fact | 19 May 2025 | 0001314596 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | SNDX | Common Stock | Purchase | $91,120 | +10,000 | +11% | $9.11 | 100,000 | 19 May 2025 | Direct |