SEC Form 4 · accession 0001137789-26-000182
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
Aug 20, 2026
Accepted (ET)
Aug 24, 2026 · 5:10 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 | Aug 20, 2026 | M | 6,404 | $0.00 | A | 301,921 | D | |
| Ordinary Shares | Aug 21, 2026 | S | 3,438 | $849.3548 | D | 298,483 | D | |
| Ordinary Shares | Aug 20, 2026 | M | 21,065 | $0.00 | A | 319,548 | D | |
| Ordinary Shares | Aug 21, 2026 | S | 11,308 | $849.3548 | D | 308,240 | D | |
| Ordinary Shares | Aug 20, 2026 | M | 6,320 | $0.00 | A | 314,560 | D | |
| Ordinary Shares | Aug 21, 2026 | S | 3,393 | $849.3548 | D | 311,168 | 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 | Aug 20, 2026 | M | 6,404 | D | — | — | Ordinary Shares | 6,404 | 19,213 | D |
| Restricted Share UnitF2 | $0.00 | Aug 20, 2026 | M | 6,320 | D | — | — | Ordinary Shares | 6,320 | 0 | D |
| Restricted Share UnitF2 | $0.00 | Aug 20, 2026 | M | 21,065 | D | — | — | Ordinary Shares | 21,065 | 0 | D |
| Restricted Share UnitF3 | $0.00 | Aug 20, 2026 | A | 5,309 | A | — | — | Ordinary Shares | 5,309 | 5,309 | D |
| Restricted Share UnitF4 | $0.00 | Aug 20, 2026 | A | 5,280 | A | — | — | Ordinary Shares | 5,280 | 5,280 | D |
| Restricted Share UnitF4 | $0.00 | Aug 20, 2026 | A | 1,584 | A | — | — | Ordinary Shares | 1,584 | 1,584 | D |
| NQ Stock OptionF5 | $850.24 | Aug 20, 2026 | A | 31,856 | A | — | Aug 20, 2033 | Ordinary Shares | 31,856 | 31,856 | D |
Explanation of responses
- F1Consists of a grant of Restricted Share Unit (RSU) awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan") subject to a four-year vesting schedule. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on August 20, 2026 and then in equal quarterly installments thereafter.
- F2Consists of a grant of RSUs awarded to the Reporting Person under the Plan. 100% of such RSUs vested on the first anniversary of the grant date, August 20, 2026.
- F3Consists of a grant of RSUs awarded to the Reporting Person under the Plan subject to a four-year vesting schedule. Subject to the Reporting Person's continuous employment, such RSUs vest as to one-quarter of the shares on August 20, 2027 and then in equal quarterly installments thereafter.
- F4Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, 100% of such RSUs will vest on the first anniversary of the grant date, August 20, 2027.
- F5Consists of Options awarded to the Reporting Person under the Plan subject to a four-year vesting schedule. Subject to the Reporting Person's continuous employment, such Options vest as to one-quarter of the shares on August 20, 2027 and the remaining portion shall vest in equal monthly installments over the following three years for a total vesting period of four years.