Exhibit 3.1

CERTIFICATE OF AMENDMENT

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

WEX INC.

Pursuant to Section 242 of the

General Corporation Law of the State of Delaware

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

1.This Certificate of Amendment amends the provisions of the Corporation’s Amended and Restated Certificate of Incorporation (the “Certificate of Incorporation”).

2.Pursuant to Section 242 of the General Corporation Law of the State of Delaware (the “DGCL”), this Certificate of Amendment hereby amends the provision of the Corporation’s Certificate of Incorporation by deleting “Article VI” and substituting therefore a new Article VI to read in its entirety as follows:

“Article VI

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 from liability or limitation thereof is not permitted under the DGCL as the same exists or may hereafter be amended. If the DGCL is amended hereafter to authorize the further elimination or limitation of the liability of directors or officers, then the liability of a director or officer of the Corporation shall be eliminated or limited to the fullest extent authorized by the DGCL, as so amended. Any repeal or modification of this Article VI 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.Except as amended hereby, all other provisions of the Certificate of Incorporation shall remain in full force and effect.

4.This Certificate of Amendment to the Amended and Restated Certificate of Incorporation has been duly adopted by the stockholders of the Corporation in accordance with the provisions of Section 242 of the Delaware General Corporation Law.

IN WITNESS WHEREOF, the Corporation has caused this Certificate of Amendment to be duly executed in its corporate name this 16th day of May, 2025.

WEX INC.

By: /s/ Sara T.W. Trickett

Name: Sara T.W. Trickett

Title: Chief Legal Officer and Corporate Secretary

WEX Inc. 8-K