SEC Form 4 · accession 0001137789-26-000148
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
Jul 1, 2026
Accepted (ET)
Jul 2, 2026 · 4:40 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001137789
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Ordinary SharesF1,F2 | Jul 1, 2026 | S | 1,480 | $919.6414 | D | 319,380 | D | |
| Ordinary SharesF3 | Jul 1, 2026 | S | 880 | $920.5713 | D | 318,500 | D | |
| Ordinary SharesF4 | Jul 1, 2026 | S | 880 | $921.8045 | D | 317,620 | D | |
| Ordinary SharesF5 | Jul 1, 2026 | S | 720 | $922.6828 | D | 316,900 | D | |
| Ordinary SharesF6 | Jul 1, 2026 | S | 1,160 | $923.832 | D | 315,740 | D | |
| Ordinary SharesF7 | Jul 1, 2026 | S | 770 | $925.0257 | D | 314,970 | D | |
| Ordinary SharesF8 | Jul 1, 2026 | S | 1,019 | $926.1676 | D | 313,951 | D | |
| Ordinary SharesF9 | Jul 1, 2026 | S | 571 | $926.9989 | D | 313,380 | D | |
| Ordinary SharesF10 | Jul 1, 2026 | S | 620 | $928.0977 | D | 312,760 | D | |
| Ordinary SharesF11 | Jul 1, 2026 | S | 320 | $929.105 | D | 312,440 | D | |
| Ordinary SharesF12 | Jul 1, 2026 | S | 280 | $930.0957 | D | 312,160 | D | |
| Ordinary SharesF13 | Jul 1, 2026 | S | 120 | $931.6167 | D | 312,040 | D | |
| Ordinary SharesF14 | Jul 1, 2026 | S | 320 | $932.9413 | D | 311,720 | D | |
| Ordinary SharesF15 | Jul 1, 2026 | S | 200 | $934.452 | D | 311,520 | D | |
| Ordinary Shares | Jul 1, 2026 | S | 3 | $936.36 | D | 311,517 | D |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 18, 2026.
- F10These Ordinary Shares were sold in multiple trades at prices ranging from $927.61 to $928.33. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F11These Ordinary Shares were sold in multiple trades at prices ranging from $928.63 to $929.22. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F12These Ordinary Shares were sold in multiple trades at prices ranging from $929.67 to $930.23. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F13These Ordinary Shares were sold in multiple trades at prices ranging from $931.21 to $931.83. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F14These Ordinary Shares were sold in multiple trades at prices ranging from $932.65 to $933.54. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F15These Ordinary Shares were sold in multiple trades at prices ranging from $934.30 to $934.61. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F2These Ordinary Shares were sold in multiple trades at prices ranging from $919.19 to $920.18. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F3These Ordinary Shares were sold in multiple trades at prices ranging from $920.19 to $921.18. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F4These Ordinary Shares were sold in multiple trades at prices ranging from $921.20 to $922.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F5These Ordinary Shares were sold in multiple trades at prices ranging from $922.30 to $923.27. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F6These Ordinary Shares were sold in multiple trades at prices ranging from $923.45 to $924.44. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F7These Ordinary Shares were sold in multiple trades at prices ranging from $924.54 to $925.51. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F8These Ordinary Shares were sold in multiple trades at prices ranging from $925.54 to $926.51. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
- F9These Ordinary Shares were sold in multiple trades at prices ranging from $926.54 to $927.43. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.