Seagate Technology Holdings plc

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

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

Seagate Technology

Holdings Public Limited Company

(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 the appropriate box):

September 8, 2026

Dear Fellow Shareholder:

You are cordially invited to attend the 2026 Annual General Meeting of Shareholders of Seagate Technology Holdings plc, which will be held virtually via live webcast on Saturday, October 24, 2026 at 5:00 p.m. Singapore Standard Time.

You may attend the meeting, vote, and submit questions during the meeting by visiting www.virtualshareholdermeeting.com/STX2026 or via live webcast to be made available at the registered office of the Company at 10 Earlsfort Terrace, Dublin 2, D02 T380, Ireland at 5:00 p.m. Singapore Standard Time (5:00 a.m. Eastern Daylight Time / 10:00 a.m. Irish Time).

Details of the business to be presented at the meeting may be found in the Notice of 2026 Annual General Meeting and the Proxy Statement. We urge you to read the Proxy Statement carefully and use one of the methods of voting described in the Proxy Statement accompanying this letter.

On behalf of the Board of Directors of Seagate Technology Holdings plc, we thank you for your continued support.

Sincerely,

SEAGATE TECHNOLOGY HOLDINGS PUBLIC LIMITED COMPANY

Notice of 2026 Annual General Meeting of Shareholders

The 2026 Annual General Meeting of Shareholders (the “2026 AGM”) of Seagate Technology Holdings plc (“Seagate” or the “Company”), a company incorporated under the laws of Ireland with its registered office at 10 Earlsfort Terrace, Dublin 2, D02 T380, Ireland, and its principal executive offices at 121 Woodlands Avenue 5, Singapore, 739009, will be held virtually via live webcast on Saturday, October 24, 2026, at 5:00 p.m. Singapore Standard Time. Shareholders of record can attend the 2026 AGM by visiting www.virtualshareholdermeeting.com/STX2026 (the “Website”) or via live webcast to be made available at the registered office of the Company. There is no requirement to register to attend the 2026 AGM. In accordance with the rules and regulations adopted by the U.S. Securities and Exchange Commission (the “SEC”), we have elected to furnish our proxy materials to shareholders by providing access to such materials on the Internet. Accordingly, on our about September 8, 2026, we are sending shareholders a Notice of Internet Availability (the “Notice”) and making this proxy statement available online.

The purposes of the 2026 AGM, which are more completely described in the accompanying Proxy Statement, are:

The Board recommends that you vote “FOR” each Director Nominee included in Proposal 1 and “FOR” each of Proposals 2 through 6. The full text of these proposals is set forth in the accompanying Proxy Statement.

Proposals 1 through 4 are ordinary resolutions, requiring the approval of a majority of the votes cast. Proposals 5 and 6 are special resolutions, requiring the approval of at least 75% of the votes cast.

Only shareholders as of the close of business on August 26, 2026 (the “Record Date”) are entitled to receive notice of and vote at the 2026 AGM. If you are a shareholder as of the close of business on the Record Date, you may attend, speak, and vote at the 2026 AGM via the Website, by entering the 16-digit control number included on your notices, proxy cards, or voting instruction forms received with this Notice of 2026 AGM, or via live webcast to be made available at the registered office of the Company, where you will be required to present valid photo identification matching that of a shareholder appearing on the Company’s register as of the close of business on the Record Date and a copy of a share certificate or other evidence of share ownership. Alternatively, you may appoint a proxy or proxies to attend, speak, and vote on your behalf. A proxy need not be a shareholder. If you wish to appoint as proxy any person other than the individuals specified on the proxy card, please contact the Company Secretary at our registered office for further instructions or deliver to the Company Secretary at our registered office a proxy card in the form mailed to you or in the form set out in section 184 of the Irish Companies Act 2014 (the “Irish Companies Act”). You may submit questions in advance of the 2026 AGM at www.proxyvote.com and may communicate questions during the meeting through the Q&A function to be made available at the meeting.

Please cast your vote by proxy. You may vote by using the Internet, by telephone, during the 2026 AGM, or by completing, signing, and returning your proxy card by mail by no later than 11:59 a.m. Eastern Daylight Time (11:59 p.m. Singapore Standard Time) on October 23, 2026 (or, if you are a beneficial owner, such earlier time as your bank, broker-dealer, brokerage firm, or nominee may require). Instructions on how to submit your proxy are set forth in the accompanying Proxy Statement.

Further instructions on how to attend, vote, and submit questions at the meeting will be posted on the Website.

If you have any questions about the meeting or require assistance, please call Georgeson LLC, our proxy solicitor, at +1 781 575 2137 or at + 1 800 891 3214 (toll-free within the United States).

During the meeting, management will review Seagate’s affairs and will also present Seagate’s Irish statutory financial statements for the fiscal year ended July 3, 2026 (“Fiscal Year 2026” or “FY2026”) and the reports of the directors and statutory auditors thereon. There is no requirement under Irish law that the Irish statutory financial statements be approved by shareholders, and no such approval will be sought at the meeting.

IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS

FOR THE ANNUAL GENERAL MEETING OF SHAREHOLDERS

TO BE HELD ON OCTOBER 24, 2026

We will rely on the SEC rule that allows companies to furnish proxy materials over the Internet instead of mailing printed copies of those materials to each shareholder. As a result, we are sending our shareholders the Notice instead of a paper copy of our Proxy Statement, including our Irish statutory financial statements for Fiscal Year 2026 and any other appendices thereto, the proxy card, and our Annual Report on Form 10-K for Fiscal Year 2026 (collectively, the “Proxy Materials”). The Notice also contains instructions on how to request a paper or email copy of the Proxy Materials. If you have previously elected to receive our Proxy Materials electronically, you will continue to receive these materials via email unless you elect otherwise. A full printed set of our Proxy Materials will be mailed to you automatically only if you have previously made a permanent election to receive our Proxy Materials in printed form. The Proxy Materials are first being mailed on or around September 8, 2026 to shareholders as of the close of business on the Record Date.

IF YOU ARE A SHAREHOLDER WHO IS ENTITLED TO ATTEND, SPEAK, AND VOTE AT THE 2026 ANNUAL GENERAL MEETING OF SHAREHOLDERS, THEN YOU ARE ENTITLED TO APPOINT A PROXY OR PROXIES TO ATTEND, SPEAK, AND VOTE ON YOUR BEHALF. A PROXY NEED NOT BE A SHAREHOLDER. IF YOU WISH TO APPOINT AS PROXY ANY PERSON OTHER THAN THE INDIVIDUALS SPECIFIED ON THE PROXY CARD, PLEASE CONTACT THE COMPANY SECRETARY AT OUR REGISTERED OFFICE FOR FURTHER INSTRUCTIONS OR DELIVER TO THE COMPANY SECRETARY AT OUR REGISTERED OFFICE A PROXY CARD IN THE FORM MAILED TO YOU OR IN THE FORM SET OUT IN SECTION 184 OF THE IRISH COMPANIES ACT.

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