| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Welch John R. | Director | 975 MEMORIAL DRIVE, APT 611, CAMBRIDGE | /s/ John R. Welch | 20 Feb 2026 | 0001611303 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CLH | Common Stock | Sale | $204,802 | -750 | -6.8% | $273.07 | 10,237 | 19 Feb 2026 | Direct |