FIRST SOLAR, INC.

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 þ

Filed by a party other than the Registrant ¨

Check the appropriate box:

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April 2, 2026

Dear Stockholder:

You are cordially invited to attend the 2026 annual meeting of stockholders of First Solar, Inc. on Wednesday, May 13, 2026 at 12:00 p.m., Eastern Time, which will be a virtual meeting, conducted via live webcast.

The virtual meeting format allows all of our stockholders the opportunity to participate in the annual meeting no matter where they are located. If you plan to attend the annual meeting virtually on the Internet, please follow the instructions in the “Questions and Answers About the Annual Meeting” section of this proxy statement.

This proxy statement contains important information about participating in the annual meeting, proxy voting, and the business to be conducted at the annual meeting, as does the Notice of Internet Availability of Proxy Materials that has been mailed to each stockholder (the “Notice”). The Notice also describes how you can access this proxy statement and a copy of our 2025 Annual Report to stockholders (the “2025 Annual Report”) on the Internet. We encourage you to read our 2025 Annual Report. It includes our audited consolidated financial statements and information about our operations, markets, and products.

Your vote is important. Whether or not you plan to attend the annual meeting, we hope you will vote as soon as possible. If you are a stockholder of record, you may vote on the Internet or by telephone, and, if you requested to receive printed proxy materials, by mailing the proxy card. If you hold your shares beneficially in street name, you may vote on the Internet and as is otherwise provided in the Notice you receive from your broker, bank, or other nominee. Please carefully review the instructions regarding each of your voting options described in this proxy statement and in any Notice you receive from us or your broker, bank, or other nominee.

Sincerely,

Mark R. Widmar

Chief Executive Officer

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

The 2026 annual meeting of stockholders of First Solar, Inc. will be held on Wednesday, May 13, 2026 at 12:00 p.m., Eastern Time, virtually on the Internet. You will be able to attend the annual meeting, vote, and submit questions during the meeting by visiting meetnow.global/MWLFLNW. Further information regarding attendance, including how to access the virtual meeting, is set forth in the “Questions and Answers About the Annual Meeting” section of this proxy statement.

The purposes of the annual meeting are as follows:

1. to elect ten members of the board of directors to hold office until the next annual meeting of stockholders or until their respective successors have been elected and qualified;

2. to ratify the appointment of PricewaterhouseCoopers LLP as First Solar, Inc.’s independent registered public accounting firm for the year ending December 31, 2026;

3. to approve an advisory resolution on the compensation of our named executive officers;

4. to vote on a stockholder proposal to improve shareholder ability to call for a special shareholder meeting; and

5. to transact such other business as may properly come before the annual meeting.

Any action may be taken on the foregoing proposals at the annual meeting on the date specified above or on any date or dates to which the annual meeting may be adjourned or postponed.

The close of business on March 19, 2026 is the record date for determining stockholders entitled to vote at the annual meeting. Only holders of common stock of First Solar, Inc. as of the record date are entitled to vote on the matters listed in this notice of annual meeting of stockholders. A complete list of stockholders entitled to vote at the annual meeting will be available for inspection by stockholders during normal business hours at our corporate headquarters located at 4300 E Camelback Road, Suite 220, Phoenix, Arizona 85018 during the 10 days prior to the annual meeting. The list of stockholders will also be made available to stockholders virtually during the annual meeting. The Notice is first being mailed to stockholders, and this proxy statement is first being made available to stockholders, on or about April 2, 2026.

By order of the board of directors,

Jason Dymbort

General Counsel & Secretary

April 2, 2026

Your vote is very importantWhether or not you plan to attend the annual meeting, we encourage you to read this proxy statement and submit your proxy or voting instructions as soon as possible. For specific instructions on how to vote your shares, please refer to the instructions in any Notice you receive, in the section entitled “Questions and Answers About the Annual Meeting” beginning on page 1 of this proxy statement or, if you requested to receive printed proxy materials, in the proxy card or voting instruction form enclosed with such proxy materials.