Seagate Technology (STX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-14 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: 2026-09-14 | Code: M (Exercise of derivative) Shares: +177,000 | Price: $0.00 Shares Owned After: 475,997.5 | Ownership: D (Direct) Footnotes: [F1] Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions. [Transaction #2] Security: Ordinary Shares Date: 2026-09-15 | Code: S (Open market sale) Shares: -97,889.25 | Price: $772.14 Total Value: $75,584,518.74 Shares Owned After: 378,108.25 | Ownership: D (Direct) Footnotes: [F2] Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations. --- Derivative Transactions --- [Transaction #1] Security: Performance-Based Restricted Share Units Date: 2026-09-14 | Code: M (Exercise of derivative) Shares: -177,000 | Price: $0.00 Exercise Price: $0.00 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F3] Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee. [F3] Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee. --- Footnotes (Complete Index) --- F1: Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions. F2: Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations. F3: Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee. --- Signature --- /s/ /s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley (2026-09-16)