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 OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * MOSLEY WILLIAM D 2. Issuer Name and Ticker or Trading Symbol Seagate Technology Holdings plc [ STX ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Executive Officer
(Last)         (First)         (Middle)
SEAGATE TECHNOLOGY HOLDINGS PLC, 47488 KATO ROAD
3. Date of Earliest Transaction (MM/DD/YYYY)
7/22/2021
(Street)
FREMONT, CA 94538
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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  7/22/2021    A    16842 (1) A $0  509265 (2) D   
Ordinary Shares  7/22/2021    A    12676 (3) A $0  521941  D   
Ordinary Shares  7/22/2021    A    13007 (4) A $0  534948  D   
Ordinary Shares  7/22/2021    A    15665 (5) A $0  550613  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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

Explanation of Responses:
(1)  On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 16,842 of the 67,367 Threshold Performance Share Units granted to Mr. Mosley on September 11, 2017. The 16,842 Ordinary Shares will vest on September 11, 2021, subject to continuous service through such date.
(2)  Includes 13 Ordinary Shares purchased by Reporting Person on July 30, 2021 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.
(3)  On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 12,676 of the 50,706 Threshold Performance Share Units granted to Mr. Mosley on September 10, 2018. The 12,676 Ordinary Shares will vest on September 10, 2021, subject to continuous service through such date.
(4)  On July 22, 2021, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 13,007 of the 52,027 Threshold Performance Share Units granted to Mr. Mosley on September 9, 2019. The 13,007 Ordinary Shares will vest on September 9, 2021, subject to continuous service through such date.
(5)  On July 22, 2020, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 15,665 of the 62,660 Threshold Performance Share Units granted to Mr. Mosley on September 9, 2020. The 15,665 Ordinary Shares will vest on September 9, 2021, subject to continuous service through such date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
MOSLEY WILLIAM D
SEAGATE TECHNOLOGY HOLDINGS PLC
47488 KATO ROAD
FREMONT, CA 94538
X
Chief Executive Officer

Signatures
/s/ Jamie Amentler, Attorney-in-Fact for William D. Mosley 8/27/2021
**Signature of Reporting Person Date
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