| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Bitting Kurt | Director and Chief Executive Officer, Director | C/O ECOVYST INC., 600 LEE ROAD, SUITE 200, WAYNE | /s/ Joseph S. Koscinski, as attorney-in-fact for Kurt Bitting | 07 Jan 2026 | 0001769761 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | ECVT | Common Stock | Tax liability | $157,751 | -16,097 | -2.7% | $9.80 | 585,904 | 05 Jan 2026 | Direct |
Director and Chief Executive Officer