=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-02-02
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: 2026-02-02 | Code: S (Open market sale)
Shares: -100 | Price: $401.10
Total Value: $40,110.00
Shares Owned After: 429,956 | 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 20, 2025.
[F2] Includes 161 Ordinary Shares purchased by Reporting Person on January 31, 2026 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.
[Transaction #2]
Security: Ordinary Shares
Date: 2026-02-02 | Code: S (Open market sale)
Shares: -100 | Price: $403.47
Total Value: $40,347.00
Shares Owned After: 429,856 | Ownership: D (Direct)
[Transaction #3]
Security: Ordinary Shares
Date: 2026-02-02 | Code: S (Open market sale)
Shares: -100 | Price: $411.90
Total Value: $41,190.00
Shares Owned After: 429,756 | Ownership: D (Direct)
[Transaction #4]
Security: Ordinary Shares
Date: 2026-02-02 | Code: S (Open market sale)
Shares: -200 | Price: $419.77
Total Value: $83,954.00
Shares Owned After: 429,556 | Ownership: D (Direct)
Footnotes:
[F3] These Ordinary Shares were sold in multiple trades at prices ranging from $419.29 to $420.25. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -200 | Price: $421.17
Total Value: $84,233.00
Shares Owned After: 429,356 | Ownership: D (Direct)
Footnotes:
[F4] These Ordinary Shares were sold in multiple trades at prices ranging from $420.96 to $421.37. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -400 | Price: $423.01
Total Value: $169,205.00
Shares Owned After: 428,956 | Ownership: D (Direct)
Footnotes:
[F5] These Ordinary Shares were sold in multiple trades at prices ranging from $422.88 to $423.23. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -875 | Price: $424.50
Total Value: $371,434.26
Shares Owned After: 428,081 | Ownership: D (Direct)
Footnotes:
[F6] These Ordinary Shares were sold in multiple trades at prices ranging from $424.11 to $424.81. 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 #8]
Security: Ordinary Shares
Date: 2026-02-02 | Code: S (Open market sale)
Shares: -978 | Price: $425.69
Total Value: $416,323.65
Shares Owned After: 427,103 | Ownership: D (Direct)
Footnotes:
[F7] These Ordinary Shares were sold in multiple trades at prices ranging from $425.26 to $426.20. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -1,900 | Price: $427.06
Total Value: $811,422.93
Shares Owned After: 425,203 | Ownership: D (Direct)
Footnotes:
[F8] These Ordinary Shares were sold in multiple trades at prices ranging from $426.60 to $427.55. 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 #10]
Security: Ordinary Shares
Date: 2026-02-02 | Code: S (Open market sale)
Shares: -2,283 | Price: $428.00
Total Value: $977,113.95
Shares Owned After: 422,920 | Ownership: D (Direct)
Footnotes:
[F9] These Ordinary Shares were sold in multiple trades at prices ranging from $427.60 to $428.56. 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 #11]
Security: Ordinary Shares
Date: 2026-02-02 | Code: S (Open market sale)
Shares: -1,564 | Price: $429.09
Total Value: $671,098.01
Shares Owned After: 421,356 | Ownership: D (Direct)
Footnotes:
[F10] These Ordinary Shares were sold in multiple trades at prices ranging from $428.61 to $429.60. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -1,800 | Price: $430.14
Total Value: $774,256.14
Shares Owned After: 419,556 | Ownership: D (Direct)
Footnotes:
[F11] These Ordinary Shares were sold in multiple trades at prices ranging from $429.63 to $430.58. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -3,725 | Price: $431.27
Total Value: $1,606,491.55
Shares Owned After: 415,831 | Ownership: D (Direct)
Footnotes:
[F12] These Ordinary Shares were sold in multiple trades at prices ranging from $430.70 to $431.67. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -3,875 | Price: $432.19
Total Value: $1,674,730.05
Shares Owned After: 411,956 | Ownership: D (Direct)
Footnotes:
[F13] These Ordinary Shares were sold in multiple trades at prices ranging from $431.74 to $432.67. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -1,600 | Price: $433.22
Total Value: $693,157.44
Shares Owned After: 410,356 | Ownership: D (Direct)
Footnotes:
[F14] These Ordinary Shares were sold in multiple trades at prices ranging from $432.93 to $433.89. 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: 2026-02-02 | Code: S (Open market sale)
Shares: -300 | Price: $434.31
Total Value: $130,292.01
Shares Owned After: 410,056 | Ownership: D (Direct)
Footnotes:
[F15] These Ordinary Shares were sold in multiple trades at prices ranging from $433.96 to $434.48. 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 20, 2025.
F10: These Ordinary Shares were sold in multiple trades at prices ranging from $428.61 to $429.60. 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 $429.63 to $430.58. 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 $430.70 to $431.67. 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 $431.74 to $432.67. 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 $432.93 to $433.89. 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 $433.96 to $434.48. 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: Includes 161 Ordinary Shares purchased by Reporting Person on January 31, 2026 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.
F3: These Ordinary Shares were sold in multiple trades at prices ranging from $419.29 to $420.25. 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.
F4: These Ordinary Shares were sold in multiple trades at prices ranging from $420.96 to $421.37. 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 $422.88 to $423.23. 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 $424.11 to $424.81. 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.
F7: These Ordinary Shares were sold in multiple trades at prices ranging from $425.26 to $426.20. 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 $426.60 to $427.55. 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.
F9: These Ordinary Shares were sold in multiple trades at prices ranging from $427.60 to $428.56. 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.
--- Signature ---
/s/ /s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley (2026-02-03)
