MOSLEY WILLIAM D 4
4 · Seagate Technology Holdings plc · Filed Mar 3, 2026
Research Summary
AI-generated summary of this filing
Seagate (STX) CEO William Mosley Sells 20,000 Shares
What Happened
William D. Mosley, Chief Executive Officer and Director of Seagate Technology Holdings plc (STX), sold a total of 20,000 ordinary shares in open‑market transactions on March 2, 2026, generating approximately $7,695,262 in proceeds. Individual lots ranged from 100 to 3,500 shares at reported prices between $375.84 and $407.66 per share (line items report weighted‑average prices for multiple trades).
These were sales (transaction code S) — routine disposition of shares rather than a purchase. The filing indicates the trades were effected pursuant to a Rule 10b5‑1 trading plan adopted by Mr. Mosley on February 20, 2025.
Key Details
- Transaction date: March 2, 2026 (Form 4 filed March 3, 2026); no late filing flagged in the provided filing.
- Shares sold: 20,000 total across multiple trades; gross proceeds ≈ $7,695,262.
- Price range reported on line items: approx. $375.84 to $407.66 per share; several line entries aggregate multiple executions and report weighted‑average prices (see footnotes F2–F20).
- Footnote F1: All transactions effected under a pre‑arranged Rule 10b5‑1 trading plan (adopted Feb 20, 2025).
- Footnotes F10–F20: Several aggregated rows represent multiple trades executed at narrow price ranges; the reporting person offers to provide full trade‑by‑trade details on request.
- Shares owned after transaction: Not disclosed in the excerpt provided — see the full Form 4 for post‑transaction ownership.
Context
- Sales executed under a 10b5‑1 plan are typically pre‑scheduled and do not, by themselves, indicate a change in the insider’s view of the company. For retail investors, purchases generally carry more informational weight than routine sales; these trades appear to be systematic dispositions under a pre‑arranged plan rather than opportunistic market timing.
Insider Transaction Report
Form 4
MOSLEY WILLIAM D
DirectorCEO
Transactions
- Sale
Ordinary Shares
[F1][F2]2026-03-02$375.84/sh−874$328,486→ 415,023 total - Sale
Ordinary Shares
[F3]2026-03-02$376.69/sh−326$122,800→ 414,697 total - Sale
Ordinary Shares
[F4]2026-03-02$377.95/sh−800$302,359→ 413,897 total - Sale
Ordinary Shares
[F5]2026-03-02$379.23/sh−1,740$659,862→ 412,157 total - Sale
Ordinary Shares
[F6]2026-03-02$380.42/sh−1,260$479,331→ 410,897 total - Sale
Ordinary Shares
[F7]2026-03-02$381.51/sh−800$305,210→ 410,097 total - Sale
Ordinary Shares
[F8]2026-03-02$382.41/sh−3,500$1,338,437→ 406,597 total - Sale
Ordinary Shares
[F9]2026-03-02$383.49/sh−2,700$1,035,423→ 403,897 total - Sale
Ordinary Shares
[F10]2026-03-02$384.51/sh−2,700$1,038,175→ 401,197 total - Sale
Ordinary Shares
[F11]2026-03-02$385.39/sh−1,200$462,467→ 399,997 total - Sale
Ordinary Shares
[F12]2026-03-02$387.54/sh−300$116,263→ 399,697 total - Sale
Ordinary Shares
[F13]2026-03-02$390.02/sh−300$117,005→ 399,397 total - Sale
Ordinary Shares
[F14]2026-03-02$392.09/sh−500$196,044→ 398,897 total - Sale
Ordinary Shares
[F15]2026-03-02$393.33/sh−500$196,666→ 398,397 total - Sale
Ordinary Shares
[F16]2026-03-02$394.75/sh−600$236,851→ 397,797 total - Sale
Ordinary Shares
[F17]2026-03-02$396.42/sh−800$317,132→ 396,997 total - Sale
Ordinary Shares
[F18]2026-03-02$397.61/sh−200$79,521→ 396,797 total - Sale
Ordinary Shares
2026-03-02$400.27/sh−100$40,027→ 396,697 total - Sale
Ordinary Shares
[F19]2026-03-02$402.09/sh−300$120,627→ 396,397 total - Sale
Ordinary Shares
2026-03-02$403.05/sh−100$40,305→ 396,297 total - Sale
Ordinary Shares
[F20]2026-03-02$405.02/sh−300$121,505→ 395,997 total - Sale
Ordinary Shares
2026-03-02$407.66/sh−100$40,766→ 395,897 total
Footnotes (20)
- [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.
- [F10]These Ordinary Shares were sold in multiple trades at prices ranging from $384.05 to $384.93. 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 $385.11 to $386.02. 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 $387.35 to $387.64. 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 $389.61 to $390.49. 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 $391.68 to $392.58. 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 $392.95 to $393.73. 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 $394.26 to $395.19. 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 $395.77 to $396.74. 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 $397.51 to $397.70. 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.
- [F19]These Ordinary Shares were sold in multiple trades at prices ranging from $401.89 to $402.43. 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.
- [F2]These Ordinary Shares were sold in multiple trades at prices ranging from $375.25 to $376.13. 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.
- [F20]These Ordinary Shares were sold in multiple trades at prices ranging from $404.64 to $405.36. 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 $376.37 to $376.91. 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 $377.45 to $378.37. 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.
- [F5]These Ordinary Shares were sold in multiple trades at prices ranging from $378.69 to $379.68. 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 $379.89 to $380.83. 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.
- [F7]These Ordinary Shares were sold in multiple trades at prices ranging from $380.95 to $381.92. 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 $381.99 to $382.98. 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 $383.05 to $384.00. 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.
Signature
/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley|2026-03-03