Seagate Technology (STX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-11 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: 2026-09-11 | Code: M (Exercise of derivative) Shares: +3,319 | Price: $0.00 Shares Owned After: 300,867.25 | Ownership: D (Direct) [Transaction #2] Security: Ordinary Shares Date: 2026-09-14 | Code: S (Open market sale) Shares: -1,869.75 | Price: $781.23 Total Value: $1,460,696.19 Shares Owned After: 298,997.5 | Ownership: D (Direct) Footnotes: [F1] Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations. --- Derivative Transactions --- [Transaction #1] Security: Restricted Share Unit Date: 2026-09-11 | Code: M (Exercise of derivative) Shares: -3,319 | Price: $0.00 Exercise Price: $0.00 Shares Owned After: 13,276 | Ownership: D (Direct) Footnotes: [F2] Consists of a grant of restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. One-quarter of the shares vested on September 11, 2024 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 restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. One-quarter of the shares vested on September 11, 2024 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: Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations. F2: Consists of a grant of restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. One-quarter of the shares vested on September 11, 2024 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 (2026-09-15)