Sec Form 4 Filing - Teh Ban Seng @ Seagate Technology Holdings plc - 2023-09-09

FORM 4 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 Teh Ban Seng 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) EVP & Chief Commercial Officer (Last) (First) (Middle) SEAGATE TECHNOLOGY HOLDINGS PLC, 47488 KATO ROAD 3. Date of Earliest Transaction (MM/DD/YY) 09/09/2023 (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 09/09/2023 M 2,340 A $ 0 31,760 ( 1 ) ( 2 ) D Ordinary Shares 09/09/2023 M 3,464 A $ 0 35,224 D Ordinary Shares 09/09/2023 M 1,407 A $ 0 36,631 D Ordinary Shares 09/09/2023 M 3,475 A $ 0 40,106 D Ordinary Shares 09/09/2023 M 2,396 A $ 0 42,502 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 ( 3 ) 09/09/2023 M 2,340 ( 4 ) ( 4 ) Ordinary Shares 2,340 $ 0 0 D Restricted Share Unit ( 3 ) 09/09/2023 M 3,464 ( 5 ) ( 5 ) Ordinary Shares 3,464 $ 0 3,464 D Restricted Share Unit ( 3 ) 09/09/2023 M 1,407 ( 6 ) ( 6 ) Ordinary Shares 1,407 $ 0 2,816 D Restricted Share Unit ( 3 ) 09/09/2023 M 3,475 ( 7 ) ( 7 ) Ordinary Shares 3,475 $ 0 0 D Restricted Share Unit ( 3 ) 09/09/2023 M 2,396 ( 8 ) ( 8 ) Ordinary Shares 2,396 $ 0 7,189 D Restricted Share Unit $ 0 09/11/2023 A 15,820 ( 9 ) ( 9 ) Ordinary Shares 15,820 $ 0 15,820 D NQ Options $ 64.31 09/11/2023 A 42,180 ( 10 ) ( 10 ) Ordinary Shares 42,180 $ 0 42,180 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Teh Ban Seng SEAGATE TECHNOLOGY HOLDINGS PLC 47488 KATO ROAD FREMONT, CA94538 EVP & Chief Commercial Officer Signatures /s/ Steven M. Haines, Attorney-in-Fact for Ban Seng Teh 09/12/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes 314 Ordinary Shares purchased by Reporting Person on January 31, 2023 under the Issuer's Employee Stock Purchase Plan. Such acquisition is exempt from reporting pursuant to Rule 16b-3 under the Securities Exchange Act of 1934. ( 2 )This number reflects the addition of 270 shares due to an accounting error. ( 3 )Each restricted share unit ("RSU") represents a contingent right to receive one Ordinary Share of the Issuer. ( 4 )Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan the ("Plan). The RSUs will be converted into Ordinary Shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in Ordinary Shares in equal installments on each of the first four anniversaries of September 9, 2019. ( 5 )Consists of a grant of RSUs awarded to the Reporting Person under the Plan. The RSUs will be converted into Ordinary Shar es on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on September 9, 2021 and each one year anniversary thereafter. ( 6 )Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on September 9, 2022and each one year anniversary thereafter. ( 7 )Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, such RSUs vest in full on September 9, 2023. ( 8 )Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on September 9, 2023 and then in equal quarterly installments thereafter. ( 9 )Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on September 11, 2024 and then in equal quarterly installments thereafter. ( 10 )Options granted to the Reporting Person under the Plan are subject to a four-year vesting schedule. Subject to the Reporting Person's continuous employment, one-quarter of the options will vest on September 11, 2024 and the remaining options vest in equal monthly installments over the 36 months following September 11, 2024.

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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