Data spanning the past 90 days through February 19, 2026 reveals that Seagate Technology Holdings's three principal insider shareholders consist of Director Holdings, L.P. Valueact (13.44Mn shares), Ceo William D Mosley (410.06K shares), Director Stephen J Luczo (231.79K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Holdings, L.P. Valueact | 13,437,070 | 22 Feb, 2022 | |
| William D Mosley | Ceo | 410,056 | 03 Feb, 2026 |
| Stephen J Luczo | 231,788 | 22 Oct, 2021 | |
| Gianluca Romano | Evp & Cfo | 50,351 | 12 Dec, 2025 |
| Edward J Zander | 41,357 | 24 Oct, 2023 | |
| Ravi Naik | Evp And Lyve Storage Services | 38,857 | 23 Mar, 2023 |
| Jeffrey D. Nygaard | Evp And Operations And Technology | 30,360 | 02 Feb, 2023 |
| Richard L Clemmer | 29,704 | 21 Oct, 2025 | |
| Katherine Schuelke | Svp And Clo & Corporate Secretary | 29,063 | 12 Dec, 2023 |
| Judy Bruner | 18,585 | 22 Oct, 2024 | |
| Jeffrey D. Fochtman | Svp And Business & Marketing | 14,736 | 14 Sep, 2022 |
| Dylan G. Haggart | 14,515 | 21 Oct, 2025 | |
| Mark Adams | 14,331 | 21 Oct, 2025 | |
| John Christopher Morris | Evp & Cto | 14,250 | 16 Dec, 2025 |
| Prat Bhatt | 13,869 | 21 Oct, 2025 | |
| Michael R Cannon | 13,439 | 21 Oct, 2025 | |
| Stephanie Tilenius | 12,244 | 05 Nov, 2025 | |
| Shankar Arumugavelu | 7,626 | 12 Nov, 2025 | |
| Robert A Bruggeworth | 6,591 | 22 Oct, 2024 | |
| Yolanda Lee Conyers | 5,601 | 02 Dec, 2025 | |
| Ban Seng Teh | Evp & Chief Commercial Officer | 3,092 | 02 Feb, 2026 |
| Kian Fatt Chong | Evp Global Operations | 1,258 | 12 Dec, 2025 |
| Thomas A Szlosek | 357 | 12 Nov, 2025 | |
| James Ci Lee | Evp & Clo | 257 | 28 Jan, 2026 |
| Jay L Geldmacher | 223 | 02 Feb, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 300 | $434.31 | 410,056 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 3,725 | $431.27 | 415,831 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 200 | $421.16 | 429,356 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 100 | $403.47 | 429,856 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 1,800 | $430.14 | 419,556 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 1,564 | $429.09 | 421,356 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 100 | $401.10 | 429,956 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 100 | $411.90 | 429,756 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 1,900 | $427.06 | 425,203 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 200 | $419.77 | 429,556 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 3,875 | $432.19 | 411,956 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 875 | $424.50 | 428,081 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 400 | $423.01 | 428,956 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 2,283 | $428.00 | 422,920 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 1,600 | $433.22 | 410,356 | D | S |
| 02 Feb, 2026 | William D Mosley | Ordinary Shares | D | 978 | $425.69 | 427,103 | D | S |
| 30 Jan, 2026 | Jay L Geldmacher | Ordinary Shares | D | 925 | $448.02 | 223 | D | S |
| 29 Jan, 2026 | Ban Seng Teh | Ordinary Shares | D | 1,348 | $440.49 | 12,525 | D | S |
| 29 Jan, 2026 | Ban Seng Teh | Ordinary Shares | D | 9,414 | $440.24 | 13,873 | D | S |
| 29 Jan, 2026 | Ban Seng Teh | Ordinary Shares | A | 9,433 | $101.34 | 23,287 | D | M |