| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Welch John R. | Director | 975 MEMORIAL DRIVE, APT 611, CAMBRIDGE | /s/ John R. Welch | 29 May 2025 | 0001611303 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CLH | Common Stock | Sale | $285,638 | -1,250 | -9.9% | $228.51 | 11,402 | 28 May 2025 | Direct |