SEC Form 4 · accession 0001137789-26-000222
Seagate Technology Holdings plc · STX
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
William D Mosley
Officer — CEO · Director
Period of report
Sep 9, 2026
Accepted (ET)
Sep 11, 2026 · 4:46 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001137789
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Ordinary Shares | Sep 9, 2026 | M | 2,815 | $0.00 | A | 297,983 | D | |
| Ordinary Shares | Sep 10, 2026 | S | 1,534 | $862.1337 | D | 296,449 | D | |
| Ordinary Shares | Sep 9, 2026 | M | 2,415 | $0.00 | A | 298,864 | D | |
| Ordinary Shares | Sep 10, 2026 | S | 1,316 | $862.1351 | D | 297,548 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Share UnitF1 | $0.00 | Sep 9, 2026 | M | 2,815 | D | — | — | Ordinary Shares | 2,815 | 0 | D |
| Restricted Share UnitF2 | $0.00 | Sep 9, 2026 | M | 2,415 | D | — | — | Ordinary Shares | 2,415 | 19,328 | D |
Explanation of responses
- F1Consists 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.
- F2Consists 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.