Seagate Technology (STX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-03-11 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: 2026-03-11 | Code: M (Exercise of derivative) Shares: +3,319 | Price: $0.00 Shares Owned After: 401,833 | Ownership: D (Direct) [Transaction #2] Security: Ordinary Shares Date: 2026-03-11 | Code: F (Payment of exercise/tax) Shares: -1,658 | Price: $385.97 Total Value: $639,938.26 Shares Owned After: 400,175 | Ownership: D (Direct) --- Derivative Transactions --- [Transaction #1] Security: Restricted Share Unit Date: 2026-03-11 | Code: M (Exercise of derivative) Shares: -3,319 | Price: $0.00 Shares Owned After: 19,914 | Ownership: D (Direct) Footnotes: [F1] Consists of a grant of restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. Subject to the Reporting Person's continuous employment, one-quarter vested starting on September 11, 2024 and then in equal quarterly installments over the following three years for a total vesting period of four years. [F1] Consists of a grant of restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. Subject to the Reporting Person's continuous employment, one-quarter vested starting on September 11, 2024 and then 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 restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. Subject to the Reporting Person's continuous employment, one-quarter vested starting on September 11, 2024 and then 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 (2026-03-12)