DIODES INC /DEL/

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

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

Check the appropriate box:

(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 appropriate boxes that apply):

Notice of Annual Meeting of Stockholders

To Be Held May 11, 2026

Notice is hereby given that the annual meeting (the “Meeting”) of the stockholders of Diodes Incorporated (the “Company”) will be held online via live audio webcast at www.proxydocs.com/DIOD on Monday, May 11, 2026, at 6:30 p.m. (Central Time). The Meeting will be conducted completely virtually, via a live audio webcast; there will be no physical meeting location. Even though our Meeting is being held virtually, stockholders will still have the ability to participate in and hear others during the Meeting. Questions should be submitted when registering to attend the Meeting. The Meeting is being held for the following purposes:

Election of Directors. To elect seven persons to the Board of Directors of the Company, each to serve until the next annual meeting of stockholders and until their respective successors have been elected and qualified. The Board of Directors’ nominees are: Elizabeth Bull, Angie Chen Button, Warren Chen, Keh-Shew Lu, Philip J. Ritter, Huey-Jen (Jenny) Su, and Gary Yu.

Approval of Executive Compensation. To approve, on an advisory basis, the Company’s executive compensation.

Ratification of Appointment of Independent Registered Public Accounting Firm. To ratify the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026.

Other Business. To transact such other business as properly may come before the Meeting or any adjournment or postponement thereof.

It is possible that an adjournment or postponement may be necessary that makes us unable to hold the Meeting on the date as planned. If such an adjournment or postponement is made, the Company will notify stockholders through the issuance of a press release and the filing of definitive additional soliciting material with the Securities and Exchange Commission.

Only persons who were stockholders of record at the close of business on March 12, 2026 are entitled to notice of and to vote either by proxy or at the Meeting or any adjournment or postponement thereof.

The proxy statement, which accompanies this Notice, contains additional information regarding the proposals to be considered at the Meeting, and stockholders are encouraged to read it in its entirety.

The Company has elected to provide access to our proxy materials by notifying you of the availability of our proxy statement and our fiscal 2025 Annual Report to Stockholders over the Internet at www.proxydocs.com/DIOD. Stockholders may also obtain a printed copy of the proxy materials free of charge by following the instructions provided in the Notice of Internet Availability of Proxy Materials that will be first mailed to stockholders on or about April 1, 2026 or in the enclosed proxy statement.

As set forth in the enclosed proxy statement, proxies are being solicited by and on behalf of the Board of Directors of the Company. All proposals set forth above are proposals of the Board of Directors.

Whether or not you plan to participate in the virtual Meeting, YOUR VOTE IS IMPORTANT. Please follow the instructions enclosed to ensure that your shares are voted. If you participate in the Meeting, you may revoke your proxy at any time prior to its exercise at the Meeting.

Dated at Plano, Texas, this 1st day of April, 2026.

By Order of the Board of Directors,

Richard D. White,

Corporate Secretary

IF YOU PLAN TO ATTEND THE MEETING

If you plan to attend the Meeting online you must be registered no later than 5:00 p.m. Central Time on May 10, 2026. To register go towww.proxydocs.com/DIOD. Upon completing your registration, you will receive further instructions via email, including your unique links that will allow you access to the Meeting and will also permit you to submit questions in advance of the Meeting. Please be sure to follow instructions found on your proxy card and subsequent instructions that will be delivered to you via email. You will be able to listen, vote, and submit questions from any remote location that has Internet connectivity. Technical assistance is available as part of the instructions.

TABLE OF CONTENTS

4949 Hedgcoxe Road, Suite 200

Plano, Texas 75024

(972) 987-3900

PROXY STATEMENT

ANNUAL MEETING: May 11, 2026