=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-03-09
10b5-1 Pre-arranged Plan: No
--- 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: 2026-03-09 | Code: M (Exercise of derivative)
Shares: +2,815 | Price: $0.00
Shares Owned After: 398,712 | Ownership: D (Direct)
[Transaction #2]
Security: Ordinary Shares
Date: 2026-03-09 | Code: F (Payment of exercise/tax)
Shares: -1,406 | Price: $374.33
Total Value: $526,307.98
Shares Owned After: 397,306 | Ownership: D (Direct)
[Transaction #3]
Security: Ordinary Shares
Date: 2026-03-09 | Code: M (Exercise of derivative)
Shares: +2,415 | Price: $0.00
Shares Owned After: 399,721 | Ownership: D (Direct)
[Transaction #4]
Security: Ordinary Shares
Date: 2026-03-09 | Code: F (Payment of exercise/tax)
Shares: -1,207 | Price: $374.33
Total Value: $451,816.31
Shares Owned After: 398,514 | Ownership: D (Direct)
--- Derivative Transactions ---
[Transaction #1]
Security: Restricted Share Unit
Date: 2026-03-09 | Code: M (Exercise of derivative)
Shares: -2,815 | Price: $0.00
Shares Owned After: 5,630 | Ownership: D (Direct)
Footnotes:
[F1] Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares on September 9, 2023 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.
[F1] Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares on September 9, 2023 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.
[Transaction #2]
Security: Restricted Share Unit
Date: 2026-03-09 | Code: M (Exercise of derivative)
Shares: -2,415 | Price: $0.00
Shares Owned After: 24,158 | Ownership: D (Direct)
Footnotes:
[F2] Consists of a grant of RSUs awarded to the Reporting Person under the 2022 Plan. Subject to the Reporting Person's continuous employment, one-quarter vested on September 9, 2025 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.
[F2] Consists of a grant of RSUs awarded to the Reporting Person under the 2022 Plan. Subject to the Reporting Person's continuous employment, one-quarter vested on September 9, 2025 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.
--- Footnotes (Complete Index) ---
F1: Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares on September 9, 2023 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.
F2: Consists of a grant of RSUs awarded to the Reporting Person under the 2022 Plan. Subject to the Reporting Person's continuous employment, one-quarter vested on September 9, 2025 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.
--- Signature ---
/s/ /s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley (2026-03-11)
