Company: CLH
Filing Date: 2025-04-11
Form Type: DEFA14A
Source: 0000822818-25-000013
Chunk: 0

Company: CLEAN HARBORS INC
Filing Date: 2025-04-11
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A
<div align='center'>Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant Filed by a Party other than the Registrant</div>

| Check the appropriate box: |     |                                                                                 |
|                            |     | Preliminary Proxy Statement                                                     |
|                            |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
|                            |     | Definitive Proxy Statement                                                      |
|                            |     | Definitive Additional Materials                                                 |
|                            |     | Soliciting Material under §240.14a-12                                           |

| Clean Harbors, Inc. |

| (Name of Registrant as Specified In Its Charter)                         |
| (Name of Person(s) Filing Proxy Statement, if other than the Registrant) |

| Payment of Filing Fee (Check all the boxes that apply): |     |                                                                                                      |
|                                                         |     | No fee required.                                                                                     |
|                                                         |     | Fee paid previously with preliminary materials.                                                      |
|                                                         |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |