=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-06-01
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: 2026-06-01 | Code: S (Open market sale)
Shares: -320 | Price: $916.77
Total Value: $293,368.00
Shares Owned After: 337,051 | 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 $916.34 to $917.19. 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 #2]
Security: Ordinary Shares
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -480 | Price: $918.75
Total Value: $440,999.42
Shares Owned After: 336,571 | Ownership: D (Direct)
Footnotes:
[F3] These Ordinary Shares were sold in multiple trades at prices ranging from $918.07 to $919.05. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -1,691 | Price: $919.62
Total Value: $1,555,082.32
Shares Owned After: 334,880 | Ownership: D (Direct)
Footnotes:
[F4] These Ordinary Shares were sold in multiple trades at prices ranging from $919.24 to $920.21. 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 #4]
Security: Ordinary Shares
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -1,730 | Price: $920.90
Total Value: $1,593,159.08
Shares Owned After: 333,150 | Ownership: D (Direct)
Footnotes:
[F5] These Ordinary Shares were sold in multiple trades at prices ranging from $920.26 to $921.25. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -1,807 | Price: $921.75
Total Value: $1,665,597.55
Shares Owned After: 331,343 | Ownership: D (Direct)
Footnotes:
[F6] These Ordinary Shares were sold in multiple trades at prices ranging from $921.33 to $922.32. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -1,598 | Price: $922.95
Total Value: $1,474,873.46
Shares Owned After: 329,745 | Ownership: D (Direct)
Footnotes:
[F7] These Ordinary Shares were sold in multiple trades at prices ranging from $922.39 to $923.38. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -480 | Price: $923.58
Total Value: $443,317.58
Shares Owned After: 329,265 | Ownership: D (Direct)
Footnotes:
[F8] These Ordinary Shares were sold in multiple trades at prices ranging from $923.39 to $923.92. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -360 | Price: $924.88
Total Value: $332,958.38
Shares Owned After: 328,905 | Ownership: D (Direct)
Footnotes:
[F9] These Ordinary Shares were sold in multiple trades at prices ranging from $924.39 to $925.33. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -871 | Price: $925.87
Total Value: $806,435.21
Shares Owned After: 328,034 | Ownership: D (Direct)
Footnotes:
[F10] These Ordinary Shares were sold in multiple trades at prices ranging from $925.39 to $926.38. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -320 | Price: $926.83
Total Value: $296,585.60
Shares Owned After: 327,714 | Ownership: D (Direct)
Footnotes:
[F11] These Ordinary Shares were sold in multiple trades at prices ranging from $926.39 to $927.19. 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 #11]
Security: Ordinary Shares
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -320 | Price: $928.21
Total Value: $297,028.00
Shares Owned After: 327,394 | Ownership: D (Direct)
Footnotes:
[F12] These Ordinary Shares were sold in multiple trades at prices ranging from $927.63 to $928.56. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -1,480 | Price: $929.38
Total Value: $1,375,481.96
Shares Owned After: 325,914 | Ownership: D (Direct)
Footnotes:
[F13] These Ordinary Shares were sold in multiple trades at prices ranging from $928.88 to $929.83. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -240 | Price: $930.12
Total Value: $223,229.59
Shares Owned After: 325,674 | Ownership: D (Direct)
Footnotes:
[F14] These Ordinary Shares were sold in multiple trades at prices ranging from $929.90 to $930.47. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -200 | Price: $931.65
Total Value: $186,329.20
Shares Owned After: 325,474 | Ownership: D (Direct)
Footnotes:
[F15] These Ordinary Shares were sold in multiple trades at prices ranging from $931.53 to $931.85. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -415 | Price: $933.25
Total Value: $387,298.75
Shares Owned After: 325,059 | Ownership: D (Direct)
Footnotes:
[F16] These Ordinary Shares were sold in multiple trades at prices ranging from $932.70 to $933.66. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -440 | Price: $934.17
Total Value: $411,035.20
Shares Owned After: 324,619 | Ownership: D (Direct)
Footnotes:
[F17] These Ordinary Shares were sold in multiple trades at prices ranging from $933.99 to $934.50. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -320 | Price: $935.44
Total Value: $299,341.22
Shares Owned After: 324,299 | Ownership: D (Direct)
Footnotes:
[F18] These Ordinary Shares were sold in multiple trades at prices ranging from $935.19 to $935.81. 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: 2026-06-01 | Code: S (Open market sale)
Shares: -355 | Price: $937.39
Total Value: $332,772.07
Shares Owned After: 323,944 | Ownership: D (Direct)
Footnotes:
[F19] These Ordinary Shares were sold in multiple trades at prices ranging from $937.08 to $937.64. 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 #19]
Security: Ordinary Shares
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -273 | Price: $938.82
Total Value: $256,297.26
Shares Owned After: 323,671 | Ownership: D (Direct)
Footnotes:
[F20] These Ordinary Shares were sold in multiple trades at prices ranging from $938.43 to $939.18. 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 #20]
Security: Ordinary Shares
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -80 | Price: $940.00
Total Value: $75,199.60
Shares Owned After: 323,591 | Ownership: D (Direct)
Footnotes:
[F21] These Ordinary Shares were sold in multiple trades at prices ranging from $939.92 to $940.07. 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.
--- 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 $925.39 to $926.38. 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 $926.39 to $927.19. 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.
F12: These Ordinary Shares were sold in multiple trades at prices ranging from $927.63 to $928.56. 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 $928.88 to $929.83. 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 $929.90 to $930.47. 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 $931.53 to $931.85. 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 $932.70 to $933.66. 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 $933.99 to $934.50. 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 $935.19 to $935.81. 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 $937.08 to $937.64. 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 $916.34 to $917.19. 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: These Ordinary Shares were sold in multiple trades at prices ranging from $938.43 to $939.18. 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.
F21: These Ordinary Shares were sold in multiple trades at prices ranging from $939.92 to $940.07. 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.
F3: These Ordinary Shares were sold in multiple trades at prices ranging from $918.07 to $919.05. 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 $919.24 to $920.21. 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.
F5: These Ordinary Shares were sold in multiple trades at prices ranging from $920.26 to $921.25. 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 $921.33 to $922.32. 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 $922.39 to $923.38. 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 $923.39 to $923.92. 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 $924.39 to $925.33. 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 (2026-06-02)
