Quick Takeaways
- This page summarizes William D. Mosley's Form 4 filing for Seagate Technology Holdings plc (STX).
- 21 reported transactions and 0 derivative rows are listed below.
- Filing timestamp: 02 Apr 2026, 16:53.
William D. Mosley - 01 Apr 2026 Form 4 Insider Report for Seagate Technology Holdings plc (STX)
- Role
- CEO, Director
- Signature
- /s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley
- Issuer symbol
- STX
- Transactions as of
- 01 Apr 2026
- Net transactions value
- -$8,414,638
- Form type
- 4
- Filing time
- 02 Apr 2026, 16:53:43 UTC
- Previous filing
- 23 Mar 2026
- SEC
- View on sec.gov
Quoteable Key Fact
"William D. Mosley filed Form 4 for Seagate Technology Holdings plc (STX) on 02 Apr 2026."
What Changed
- Previous filing in this sequence was filed on 23 Mar 2026.
- Current net transaction value: -$8,414,638.
Why This Matters
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Official SEC Source
Reporting Owners (1)
| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| MOSLEY WILLIAM D | CEO, Director | SEAGATE TECHNOLOGY HOLDINGS PLC, 47488 KATO ROAD, FREMONT | /s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley | 02 Apr 2026 | 0001388390 |
Transactions Table
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | STX | Ordinary Shares | Sale | $39,905 | -100 | -0.03% | $399.05 | 375,491 | 01 Apr 2026 | Direct | F1 |
| transaction | STX | Ordinary Shares | Sale | $80,067 | -200 | -0.05% | $400.34 | 375,291 | 01 Apr 2026 | Direct | F2 |
| transaction | STX | Ordinary Shares | Sale | $40,406 | -100 | -0.03% | $404.06 | 375,191 | 01 Apr 2026 | Direct | |
| transaction | STX | Ordinary Shares | Sale | $40,748 | -100 | -0.03% | $407.48 | 375,091 | 01 Apr 2026 | Direct | |
| transaction | STX | Ordinary Shares | Sale | $81,836 | -200 | -0.05% | $409.18 | 374,891 | 01 Apr 2026 | Direct | F3 |
| transaction | STX | Ordinary Shares | Sale | $41,083 | -100 | -0.03% | $410.83 | 374,791 | 01 Apr 2026 | Direct | |
| transaction | STX | Ordinary Shares | Sale | $123,685 | -300 | -0.08% | $412.28 | 374,491 | 01 Apr 2026 | Direct | F4 |
| transaction | STX | Ordinary Shares | Sale | $124,190 | -300 | -0.08% | $413.97 | 374,191 | 01 Apr 2026 | Direct | F5 |
| transaction | STX | Ordinary Shares | Sale | $332,185 | -800 | -0.21% | $415.23 | 373,391 | 01 Apr 2026 | Direct | F6 |
| transaction | STX | Ordinary Shares | Sale | $458,216 | -1,100 | -0.29% | $416.56 | 372,291 | 01 Apr 2026 | Direct | F7 |
| transaction | STX | Ordinary Shares | Sale | $337,300 | -808 | -0.22% | $417.45 | 371,483 | 01 Apr 2026 | Direct | F8 |
| transaction | STX | Ordinary Shares | Sale | $457,314 | -1,092 | -0.29% | $418.79 | 370,391 | 01 Apr 2026 | Direct | F9 |
| transaction | STX | Ordinary Shares | Sale | $629,903 | -1,500 | -0.4% | $419.94 | 368,891 | 01 Apr 2026 | Direct | F10 |
| transaction | STX | Ordinary Shares | Sale | $1,220,239 | -2,900 | -0.79% | $420.77 | 365,991 | 01 Apr 2026 | Direct | F11 |
| transaction | STX | Ordinary Shares | Sale | $1,217,844 | -2,887 | -0.79% | $421.84 | 363,104 | 01 Apr 2026 | Direct | F12 |
| transaction | STX | Ordinary Shares | Sale | $1,033,642 | -2,444 | -0.67% | $422.93 | 360,660 | 01 Apr 2026 | Direct | F13 |
| transaction | STX | Ordinary Shares | Sale | $622,820 | -1,469 | -0.41% | $423.98 | 359,191 | 01 Apr 2026 | Direct | F14 |
| transaction | STX | Ordinary Shares | Sale | $637,382 | -1,500 | -0.42% | $424.92 | 357,691 | 01 Apr 2026 | Direct | F15 |
| transaction | STX | Ordinary Shares | Sale | $425,937 | -1,000 | -0.28% | $425.94 | 356,691 | 01 Apr 2026 | Direct | F16 |
| transaction | STX | Ordinary Shares | Sale | $341,545 | -800 | -0.22% | $426.93 | 355,891 | 01 Apr 2026 | Direct | F17 |
| transaction | STX | Ordinary Shares | Sale | $128,391 | -300 | -0.08% | $427.97 | 355,591 | 01 Apr 2026 | Direct | F18 |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.
Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.
Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).
Explanation of Responses:
| Id | Content |
|---|---|
| F1 | All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 20, 2025. |
| F2 | These Ordinary Shares were sold in multiple trades at prices ranging from $400.14 to $400.53. 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. |
| F3 | These Ordinary Shares were sold in multiple trades at prices ranging from $409.03 to $409.33. 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. |
| F4 | These Ordinary Shares were sold in multiple trades at prices ranging from $412.05 to $412.40. 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. |
| F5 | These Ordinary Shares were sold in multiple trades at prices ranging from $413.57 to $414.29. 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. |
| F6 | These Ordinary Shares were sold in multiple trades at prices ranging from $414.85 to $415.69. 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. |
| F7 | These Ordinary Shares were sold in multiple trades at prices ranging from $416.18 to $417.14. 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. |
| F8 | These Ordinary Shares were sold in multiple trades at prices ranging from $417.22 to $418.18. 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. |
| F9 | These Ordinary Shares were sold in multiple trades at prices ranging from $418.22 to $419.10. 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. |
| F10 | These Ordinary Shares were sold in multiple trades at prices ranging from $419.33 to $420.31. 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. |
| F11 | These Ordinary Shares were sold in multiple trades at prices ranging from $420.35 to $421.30. 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. |
| F12 | These Ordinary Shares were sold in multiple trades at prices ranging from $421.37 to $422.35. 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. |
| F13 | These Ordinary Shares were sold in multiple trades at prices ranging from $422.41 to $423.37. 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. |
| F14 | These Ordinary Shares were sold in multiple trades at prices ranging from $423.41 to $424.38. 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. |
| F15 | These Ordinary Shares were sold in multiple trades at prices ranging from $424.46 to $425.44. 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. |
| F16 | These Ordinary Shares were sold in multiple trades at prices ranging from $425.46 to $426.19. 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. |
| F17 | These Ordinary Shares were sold in multiple trades at prices ranging from $426.47 to $427.45. 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. |
| F18 | These Ordinary Shares were sold in multiple trades at prices ranging from $427.63 to $428.14. 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. |