Seagate Technology (STX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-09 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: 2026-09-09 | Code: M (Exercise of derivative) Shares: +2,815 | Price: $0.00 Shares Owned After: 297,982.5 | Ownership: D (Direct) [Transaction #2] Security: Ordinary Shares Date: 2026-09-10 | Code: S (Open market sale) Shares: -1,533.5 | Price: $862.13 Total Value: $1,322,082.03 Shares Owned After: 296,449 | Ownership: D (Direct) [Transaction #3] Security: Ordinary Shares Date: 2026-09-09 | Code: M (Exercise of derivative) Shares: +2,415 | Price: $0.00 Shares Owned After: 298,864 | Ownership: D (Direct) [Transaction #4] Security: Ordinary Shares Date: 2026-09-10 | Code: S (Open market sale) Shares: -1,315.75 | Price: $862.14 Total Value: $1,134,354.26 Shares Owned After: 297,548.25 | Ownership: D (Direct) --- Derivative Transactions --- [Transaction #1] Security: Restricted Share Unit Date: 2026-09-09 | Code: M (Exercise of derivative) Shares: -2,815 | Price: $0.00 Exercise Price: $0.00 Shares Owned After: 0 | 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"). One-quarter of the shares vested on September 9, 2023 and the remaining portion vested 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"). One-quarter of the shares vested on September 9, 2023 and the remaining portion vested in equal quarterly installments over the following three years for a total vesting period of four years. [Transaction #2] Security: Restricted Share Unit Date: 2026-09-09 | Code: M (Exercise of derivative) Shares: -2,415 | Price: $0.00 Exercise Price: $0.00 Shares Owned After: 19,328 | Ownership: D (Direct) Footnotes: [F2] Consists of a grant of RSUs awarded to the Reporting Person under the Plan. One-quarter of the shares 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 Plan. One-quarter of the shares 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"). One-quarter of the shares vested on September 9, 2023 and the remaining portion vested 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 Plan. One-quarter of the shares 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 (2026-09-11)