Exhibit 3.1

CERTIFICATE OF AMENDMENT

OF RESTATED CERTIFICATE OF INCORPORATION

OF WESCO INTERNATIONAL, INC.

Under Section 242 of the Delaware General Corporation Law

WESCO International, Inc. (the “Corporation”), a corporation organized and existing under the General Corporation Law of the State of Delaware, hereby certifies as follows:

1. This Certificate of Amendment (the “Certificate of Amendment”) amends the provisions of the Corporation’s Restated Certificate of Incorporation filed with the Secretary of State on May 11, 1999 (the “Restated Certificate of Incorporation”).

2. Article X of the Restated Certificate of Incorporation is hereby amended and restated in its entirety as follows:

“ARTICLE X.

(a) The personal liability of a director or officer of the Corporation is hereby eliminated to the fullest extent permitted by the General Corporation Law of the State of Delaware, as the same may be amended and supplemented. Without limiting the generality of the foregoing, no director or officer shall be personally liable to the Corporation or any of its stockholders for monetary damages for breach of fiduciary duty as a director or officer, except to the extent such exemption for liability or limitation thereof is not permitted under the General Corporation Law of the State of Delaware, as amended, or supplemented.

(b) The Corporation shall indemnify and hold harmless, to the fullest extent permitted by applicable law as it presently exists or may hereafter be amended, any person who was or is made or is threatened to be made a party or is otherwise involved in any action, suit or proceeding, whether civil, criminal, administrative or investigative (a “proceeding”) by reason of the fact that he, or a person for whom he is the legal representative, is or was a director, officer, employee or agent of the Corporation or is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation or of a partnership, joint venture, trust, enterprise or non-profit entity, including service with respect to employee benefit plans, against all liability and loss suffered and expenses reasonably incurred by such person. The Corporation shall be required to indemnify a person in connection with a proceeding initiated by such person only if the proceeding was authorized by the Board of Directors of the Corporation. The rights to indemnification and advancement of expenses conferred by this Article shall be presumed to have been relied upon by directors and officers of the Corporation in serving or continuing to serve the Corporation and shall be enforceable as contract rights. Said rights shall not be exclusive of any other rights to which those seeking indemnification may otherwise be entitled. The Corporation may enter into contracts to provide such persons with specific rights to indemnification, which contracts may confer rights and protections to the maximum extent permitted by the Delaware General Corporation Law. The Corporation may create trust funds, grant security interests, obtain letters of credit, or use other means to ensure payment of such amounts as may be necessary to perform the obligations provided for in this Article or in any such contract.

(c) Any repeal or modification of this Article X by the stockholders of the Corporation shall not adversely affect any right or protection of a director or officer of the Corporation existing at the time of such repeal or modification with respect to acts or omissions occurring prior to such repeal or modification.”

3. This amendment was duly adopted in accordance with the provisions of Section 242 of the General Corporation Law of the State of Delaware.

4. All other provisions of the Restated Certificate of Incorporation shall remain in full force and effect.

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IN WITNESS WHEREOF, the Corporation has caused this Certificate of Amendment to be signed this 24^th day of May, 2024.

By:	/s/ John J. Engel
Name: John J. Engel
Title: Chairman, President and Chief Executive Officer

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