=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-05-20
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: Seagate Technology Holdings plc (STX)
CIK: 0001137789
--- Reporting Owner ---
Name: MOSLEY WILLIAM D
CIK: 0001388390
Role: Director, Officer (CEO)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Ordinary Shares
Date: 2026-05-20 | Code: M (Exercise of derivative)
Shares: +14,000 | Price: $46.23
Total Value: $647,220.00
Shares Owned After: 369,591 | Ownership: D (Direct)
[Transaction #2]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -120 | Price: $742.00
Total Value: $89,040.60
Shares Owned After: 369,471 | Ownership: D (Direct)
Footnotes:
[F1] All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 18, 2026.
[F2] These Ordinary Shares were sold in multiple trades at prices ranging from $741.70 to $742.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #3]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -560 | Price: $743.14
Total Value: $416,157.90
Shares Owned After: 368,911 | Ownership: D (Direct)
Footnotes:
[F3] These Ordinary Shares were sold in multiple trades at prices ranging from $742.70 to $743.55. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #4]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -840 | Price: $744.52
Total Value: $625,393.61
Shares Owned After: 368,071 | Ownership: D (Direct)
Footnotes:
[F4] These Ordinary Shares were sold in multiple trades at prices ranging from $743.96 to $744.91. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #5]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -1,264 | Price: $745.55
Total Value: $942,379.12
Shares Owned After: 366,807 | Ownership: D (Direct)
Footnotes:
[F5] These Ordinary Shares were sold in multiple trades at prices ranging from $745.03 to $746.02. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #6]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -1,463 | Price: $746.53
Total Value: $1,092,177.19
Shares Owned After: 365,344 | Ownership: D (Direct)
Footnotes:
[F6] These Ordinary Shares were sold in multiple trades at prices ranging from $746.10 to $747.08. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #7]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -1,605 | Price: $747.64
Total Value: $1,199,955.78
Shares Owned After: 363,739 | Ownership: D (Direct)
Footnotes:
[F7] These Ordinary Shares were sold in multiple trades at prices ranging from $747.16 to $748.13. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #8]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -1,719 | Price: $748.53
Total Value: $1,286,721.52
Shares Owned After: 362,020 | Ownership: D (Direct)
Footnotes:
[F8] These Ordinary Shares were sold in multiple trades at prices ranging from $748.16 to $749.08. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #9]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -1,619 | Price: $749.67
Total Value: $1,213,715.08
Shares Owned After: 360,401 | Ownership: D (Direct)
Footnotes:
[F9] These Ordinary Shares were sold in multiple trades at prices ranging from $749.16 to $750.15. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #10]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -4,810 | Price: $750.84
Total Value: $3,611,563.97
Shares Owned After: 355,591 | Ownership: D (Direct)
Footnotes:
[F10] These Ordinary Shares were sold in multiple trades at prices ranging from $750.18 to $751.13. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #11]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -4,206 | Price: $751.75
Total Value: $3,161,839.47
Shares Owned After: 351,385 | Ownership: D (Direct)
Footnotes:
[F11] These Ordinary Shares were sold in multiple trades at prices ranging from $751.19 to $752.17. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #12]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -3,182 | Price: $752.72
Total Value: $2,395,156.31
Shares Owned After: 348,203 | Ownership: D (Direct)
Footnotes:
[F12] These Ordinary Shares were sold in multiple trades at prices ranging from $752.19 to $753.18. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #13]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -2,708 | Price: $753.69
Total Value: $2,041,004.98
Shares Owned After: 345,495 | Ownership: D (Direct)
Footnotes:
[F13] These Ordinary Shares were sold in multiple trades at prices ranging from $753.20 to $754.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #14]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -2,163 | Price: $754.70
Total Value: $1,632,414.80
Shares Owned After: 343,332 | Ownership: D (Direct)
Footnotes:
[F14] These Ordinary Shares were sold in multiple trades at prices ranging from $754.22 to $755.21. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #15]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -1,661 | Price: $755.72
Total Value: $1,255,254.24
Shares Owned After: 341,671 | Ownership: D (Direct)
Footnotes:
[F15] These Ordinary Shares were sold in multiple trades at prices ranging from $755.22 to $756.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #16]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -1,480 | Price: $756.83
Total Value: $1,120,106.33
Shares Owned After: 340,191 | Ownership: D (Direct)
Footnotes:
[F16] These Ordinary Shares were sold in multiple trades at prices ranging from $756.26 to $757.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #17]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -320 | Price: $758.05
Total Value: $242,575.20
Shares Owned After: 339,871 | Ownership: D (Direct)
Footnotes:
[F17] These Ordinary Shares were sold in multiple trades at prices ranging from $757.49 to $758.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #18]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -80 | Price: $758.65
Total Value: $60,692.00
Shares Owned After: 339,791 | Ownership: D (Direct)
[Transaction #19]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -80 | Price: $760.49
Total Value: $60,838.80
Shares Owned After: 339,711 | Ownership: D (Direct)
Footnotes:
[F18] These Ordinary Shares were sold in multiple trades at prices ranging from $760.20 to $760.77. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
[Transaction #20]
Security: Ordinary Shares
Date: 2026-05-20 | Code: S (Open market sale)
Shares: -120 | Price: $763.18
Total Value: $91,581.60
Shares Owned After: 339,591 | Ownership: D (Direct)
Footnotes:
[F19] These Ordinary Shares were sold in multiple trades at prices ranging from $762.83 to $763.70. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
--- Derivative Transactions ---
[Transaction #1]
Security: NQ Options
Date: 2026-05-20 | Code: M (Exercise of derivative)
Shares: -14,000 | Price: $0.00
Exercisable: N/A | Expires: 2027-09-09
Shares Owned After: 153,100 | Ownership: D (Direct)
Footnotes:
[F20] Options granted to the Reporting Person under the Issuer's 2012 Equity Incentive Plan are subject to a four year vesting schedule. Subject to continuous employment, one quarter of the option shares
vested on September 9, 2021. The remaining option shares vested in equal monthly installments over the 36 months following September 9, 2021.
--- Footnotes (Complete Index) ---
F1: All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 18, 2026.
F10: These Ordinary Shares were sold in multiple trades at prices ranging from $750.18 to $751.13. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F11: These Ordinary Shares were sold in multiple trades at prices ranging from $751.19 to $752.17. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F12: These Ordinary Shares were sold in multiple trades at prices ranging from $752.19 to $753.18. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F13: These Ordinary Shares were sold in multiple trades at prices ranging from $753.20 to $754.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F14: These Ordinary Shares were sold in multiple trades at prices ranging from $754.22 to $755.21. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F15: These Ordinary Shares were sold in multiple trades at prices ranging from $755.22 to $756.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F16: These Ordinary Shares were sold in multiple trades at prices ranging from $756.26 to $757.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F17: These Ordinary Shares were sold in multiple trades at prices ranging from $757.49 to $758.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F18: These Ordinary Shares were sold in multiple trades at prices ranging from $760.20 to $760.77. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F19: These Ordinary Shares were sold in multiple trades at prices ranging from $762.83 to $763.70. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F2: These Ordinary Shares were sold in multiple trades at prices ranging from $741.70 to $742.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F20: Options granted to the Reporting Person under the Issuer's 2012 Equity Incentive Plan are subject to a four year vesting schedule. Subject to continuous employment, one quarter of the option shares
vested on September 9, 2021. The remaining option shares vested in equal monthly installments over the 36 months following September 9, 2021.
F3: These Ordinary Shares were sold in multiple trades at prices ranging from $742.70 to $743.55. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F4: These Ordinary Shares were sold in multiple trades at prices ranging from $743.96 to $744.91. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F5: These Ordinary Shares were sold in multiple trades at prices ranging from $745.03 to $746.02. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F6: These Ordinary Shares were sold in multiple trades at prices ranging from $746.10 to $747.08. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F7: These Ordinary Shares were sold in multiple trades at prices ranging from $747.16 to $748.13. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F8: These Ordinary Shares were sold in multiple trades at prices ranging from $748.16 to $749.08. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
F9: These Ordinary Shares were sold in multiple trades at prices ranging from $749.16 to $750.15. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
--- Signature ---
/s/ /s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley (2026-05-21)
