Company: CLH
Filing Date: 2025-04-11
Form Type: DEF 14A
Source: 0000822818-25-000011
Chunk: 1

Company: CLEAN HARBORS INC
Filing Date: 2025-04-11
Form: DEF 14A
Chunk 1
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 mailing to our shareholders a notice of internet availability of proxy materials, or “e-proxy notice,” containing instructions on how to access our 2025 proxy statement and the 2024 annual report to shareholders (including our 2024 Annual Report on Form 10-K).

Your vote is important. If you are unable to attend the meeting in person, it is important that your shares be represented and voted at the annual meeting. You may authorize your proxy to vote your shares over the internet, by telephone, or by mail as described under "General Matters - Proxy Solicitation" in the attached proxy statement.

Please note that under the current rules of the New York Stock Exchange, your broker will not be able to vote your shares at the annual meeting on the election of directors or on certain other proposals described in the attached proxy statement if you have not given your broker instructions on how to vote. Please be sure to give voting instructions to your broker so that your vote can be counted with respect to the election of directors and such other proposals.

Thank you for your continued support of Clean Harbors. We look forward to seeing those shareholders who are able to attend the annual meeting on May 21st.

| Sincerely,                      |
| Alan S. McKim                   |
| Executive Chairman of the Board |

#### CLEAN HARBORS, INC.

#### 42 Longwater Drive

#### Norwell, Massachusetts 02061
#### ___________________________

### NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
#### ___________________________

Notice is hereby given that the 2025 annual meeting of shareholders of Clean Harbors, Inc. (the “Company”) will be held at 10:00 a.m., local time, on Wednesday, May 21, 2025, at the Company’s training facility located at 101 Philip Drive, Norwell, Massachusetts.

The annual meeting is being held:

1. To elect five (5) Class III members of the Board of Directors of the Company to serve until the 2028 annual meeting of shareholders and until their respective successors are duly elected and qualified;

2. To hold a non-binding, advisory vote on the compensation of the Company’s named executive officers;

3. To ratify the selection of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2025; and

4. To act upon such other business as may properly come before the meeting and any adjournment or postponement thereof.

Shareholders of