| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Metzger Michael A | Chief Executive Officer, Director | C/O SYNDAX PHARMACEUTICALS, INC., 730 3RD AVENUE, FLOOR 9, NEW YORK | /s/ Michael A. Metzger | 2025-07-18 | 0001507220 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | SNDX | Common Stock | Sale | -$70K | -7.53K | -2.46% | $9.29 | 299K | Jul 16, 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock units. |