| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| GERSTENBERG ERIC W | CO-CEO | C/O CLEAN HARBORS ENVIRON. SERVICES INC., 42 LONGWATER DRIVE, NORWELL | /s/ Eric W. Gerstenberg | 09 Jun 2025 | 0001211558 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CLH | Common Stock | Sale | $1,818,957 | -8,076 | -14% | $225.23 | 51,619 | 06 Jun 2025 | Direct |