As of April 25, 2026, the three largest insider holders of STX are Holdings, L.P. Valueact (Director, 13.44Mn shares), Holdings, L.P. Valueact (Director, 13.44Mn shares), William D Mosley (Ceo, 355.59K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Holdings, L.P. Valueact | - | 0 | 13,437,070 | 22 Feb, 2022 |
| Holdings, L.P. Valueact | - | 0 | 13,437,070 | 22 Feb, 2022 |
| William D Mosley | Ceo | 355,591 | 0 | 02 Apr, 2026 |
| Stephen J Luczo | Executive Chairman Cob | 0 | 225,941 | 08 Mar, 2022 |
| Gianluca Romano | Evp Cfo | 65,335 | 0 | 12 Mar, 2026 |
| Edward J Zander | - | 0 | 41,357 | 22 Oct, 2021 |
| Edward J Zander | - | 0 | 41,357 | 22 Oct, 2021 |
| Ravi Naik | Evp, Lyve Storage Services | 38,857 | 0 | 23 Mar, 2023 |
| Jeffrey D. Nygaard | Evp, Operations And Technology | 30,360 | 0 | 02 Feb, 2023 |
| Richard L Clemmer | - | 29,704 | 0 | 21 Oct, 2025 |
| Katherine Schuelke | Svp, Clo Corporate Secretary | 29,063 | 0 | 12 Dec, 2023 |
| John Christopher Morris | Evp Cto | 17,580 | 0 | 16 Mar, 2026 |
| Jeffrey D. Fochtman | Svp, Business Marketing | 14,736 | 0 | 14 Sep, 2022 |
| Dylan G. Haggart | - | 14,515 | 0 | 21 Oct, 2025 |
| Judy Bruner | - | 0 | 14,314 | 21 Oct, 2025 |
| Prat Bhatt | - | 13,869 | 0 | 21 Oct, 2025 |
| Michael R Cannon | - | 13,439 | 0 | 21 Oct, 2025 |
| Mark Adams | - | 0 | 12,285 | 13 Dec, 2021 |
| Stephanie Tilenius | - | 12,244 | 0 | 05 Nov, 2025 |
| Ban Seng Teh | Evp Chief Commercial Officer | 11,248 | 0 | 12 Mar, 2026 |
| Ban Seng Teh | Evp Chief Commercial Officer | 11,248 | 0 | 12 Mar, 2026 |
| Shankar Arumugavelu | - | 7,626 | 0 | 12 Nov, 2025 |
| Robert A Bruggeworth | - | 6,591 | 0 | 22 Oct, 2024 |
| Stephen J Luczo | Executive Chairman Cob | 5,847 | 0 | 22 Oct, 2021 |
| Yolanda Lee Conyers | - | 4,851 | 0 | 03 Mar, 2026 |
| Judy Bruner | - | 4,271 | 0 | 22 Oct, 2024 |
| Mark Adams | - | 2,046 | 0 | 21 Oct, 2025 |
| Kian Fatt Chong | Evp Global Operations | 1,259 | 0 | 12 Mar, 2026 |
| James Ci Lee | Evp Clo | 1,021 | 0 | 23 Apr, 2026 |
| Thomas A Szlosek | - | 357 | 0 | 12 Nov, 2025 |
| Thomas A Szlosek | - | 357 | 0 | 12 Nov, 2025 |
| Jay L Geldmacher | - | 223 | 0 | 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 |
|---|---|---|---|---|---|---|---|---|
| 22 Apr, 2026 | James Ci Lee | Ordinary Shares | A | 1,237 | $0.00 | 1,561 | D | M |
| 22 Apr, 2026 | James Ci Lee | Ordinary Shares | A | 1,237 | $0.00 | 1,561 | D | M |
| 22 Apr, 2026 | James Ci Lee | Ordinary Shares | D | 540 | $579.88 | 1,021 | D | F |
| 22 Apr, 2026 | James Ci Lee | Ordinary Shares | D | 540 | $579.88 | 1,021 | D | F |
| 22 Apr, 2026 | James Ci Lee | Restricted Share Unit | D | 1,237 | $0.00 | 11,139 | D | M |
| 22 Apr, 2026 | James Ci Lee | Restricted Share Unit | D | 1,237 | $0.00 | 11,139 | D | M |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 100 | $399.05 | 375,491 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 200 | $400.34 | 375,291 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 100 | $404.06 | 375,191 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 100 | $407.48 | 375,091 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 200 | $409.18 | 374,891 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 100 | $410.83 | 374,791 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 300 | $412.28 | 374,491 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 300 | $413.97 | 374,191 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 800 | $415.23 | 373,391 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 1,100 | $416.56 | 372,291 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 808 | $417.45 | 371,483 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 1,092 | $418.79 | 370,391 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 1,500 | $419.94 | 368,891 | D | S |
| 01 Apr, 2026 | William D Mosley | Ordinary Shares | D | 2,900 | $420.77 | 365,991 | D | S |