| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| CURTIS GEORGE L | EXEC. VICE PRESIDENT (CHESI) | C/O CLEAN HARBORS, INC., 42 LONGWATER DRIVE, NORWELL | /s/ George L. Curtis | 03 Jul 2025 | 0001216581 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | CLH | Common Stock | Tax liability | $91,590 | -399 | -0.81% | $229.55 | 48,664 | 01 Jul 2025 | Direct | F1, F2 |
| Id | Content |
|---|---|
| F1 | Payment of tax liability by withholding of securities incident to vesting of securities in accordance with Rule 16b3. |
| F2 | Includes 11 shares acquired under the Clean Harbors Employee Stock Purchase Plan on 6/30/2025 |