Company: CLH
Filing Date: 2025-04-11
Form Type: DEF 14A
Source: 0000822818-25-000011
Chunk: 16

Company: CLEAN HARBORS INC
Filing Date: 2025-04-11
Form: DEF 14A
Chunk 16
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2024 Sustainability Report and other information found on or otherwise available through the Company’s website is not incorporated by reference into, nor does it form a part of, this proxy statement.

#### Executive Succession Planning
The Board recognizes that succession planning is a key component of the Company’s continued success. The C&HC Committee monitors the Company’s succession planning processes as part of its chartered responsibilities. Further, pursuant to the Board’s Corporate Governance Guidelines, the Board considers and reviews succession candidates for the Co-CEOs and other executive leadership positions for both near- and long-term planning. On an annual basis, in executive session, the Board reviews potential candidates for succession planning purposes in light of their performance, leadership qualities, and ability to manage additional responsibilities. The Board also considers potential risks regarding the retention of the Company’s current executive officers and succession candidates, the timeline for implementing each succession plan, and the extent of disruption likely to be caused as a result of unplanned attrition. In addition, as part of its risk management process, the Board has developed an interim emergency succession plan.

#### No Political Contributions
It is the Company’s policy that no Company funds or assets will be used to make a contribution to any political party or candidate. The Company has also not established any political action committee as a forum for employees to voluntarily contribute to a fund that supports any political party or candidate.

### ELECTION OF DIRECTORS
<div align='center'>(Proposal 1 on Proxy Form)</div>

The Board is the ultimate decision-making body of the Company except with respect to those matters reserved to the shareholders by law or pursuant to the Company’s Restated Articles of Organization or the Company’s Bylaws. The Board is responsible for selection of the Chief Executive Officer(s) and for advising the Chief Executive Officer(s) with respect to the selection of a management team, providing oversight responsibility and direction to management, and evaluating the performance of management on behalf of the shareholders. As more fully described below in this proxy statement, the Board has determined that, except for Alan S. McKim, the Company’s Executive Chairman and Chief Technology Officer, and Michael L. Battles and Eric W. Gerstenberg, the Company's Co-Chief Executive Officers, all of the current members of the Board are “independent directors” as defined by the NYSE rules.

In 2024, the Board held six meetings. Overall attendance at Board and committee meetings was over 95% and attendance was at least 75% for each director. All current members of the Board