Sec Form 3 Filing - Chong Kian Fatt @ Seagate Technology Holdings plc - 2023-07-25

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Chong Kian Fatt 2. Issuer Name and Ticker or Trading Symbol Seagate Technology Holdings plc [ STX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) SVP, Global Operations (Last) (First) (Middle) SEAGATE TECHNOLOGY PLC, 47488 KATO ROAD 3. Date of Earliest Transaction (MM/DD/YY) 07/25/2023 (Street) FREMONT, CA94538 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Ordinary Shares 314 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Share Unit $ 0 ( 1 ) 09/09/2023 Restricted Share Unit 1,365 D Restricted Share Unit $ 0 ( 2 ) 09/09/2024 Restricted Share Unit 5,388 D Restricted Share Unit $ 0 ( 3 ) 09/09/2025 Restricted Share Unit 3,593 D Restricted Share Unit $ 0 ( 4 ) 09/09/2023 Restricted Share Unit 1,720 D Restricted Share Unit $ 0 ( 5 ) 09/09/2026 Restricted Share Unit 3,220 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Chong Kian Fatt SEAGATE TECHNOLOGY PLC 47488 KATO ROAD FREMONT, CA94538 SVP, Global Operations Signatures /s/ Abraham S. Barrera, Attorney-in-Fact for Kian Fatt Chong 08/04/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan (the "2012 Plan"). Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares starting on September 9, 2020 and each one-year anniversary thereafter. ( 2 )Consists of a grant of RSUs awarded to the Reporting Person under the 2012 Plan. Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares starting on September 9, 2021 and each one-year anniversary thereafter. ( 3 )Consists of a grant of RSUs awarded to the Reporting Person under the 2012 Plan. Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares starting on September 9, 2022 and each one-year anniversary thereafter. ( 4 )Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, September 9, 2023. ( 5 )Consists of a grant of RSUs awarded to the Reporting Person under the 2022 Plan. Subject to the Reporting Person's continuous employment, 25% of such RSUs will vest starting on the first anniversary, September 9, 2023, and the remaining 75% of the number of RSUs granted shall vest thereafter in twelve quarterly installments, each equal to 6.25% of the number of RSUs granted, such that the RSUs shall be fully vested approximately four years following the grant date.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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