STX · Insider Trading
Seagate Technology Holdings PLC Ordinary Shares (Ireland)
Every open-market purchase and sale reported by STX officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-02 | William D Mosley | CEO | Sell | −11,002 | −$10.29M |
| 2026-10-02 | William D Mosley | CEO | MIXED | −4,998 | −$16.73M |
| 2026-09-22 | John Christopher Morris | EVP & CTO | MIXED | −8,439 | −$8.07M |
| 2026-09-16 | Kian Fatt Chong | EVP Global Operations | M | +14,470 | — |
| 2026-09-16 | Gianluca Romano | EVP & CFO | MIXED | +40,396 | −$38.60M |
| 2026-09-16 | John Christopher Morris | EVP & CTO | MIXED | +14,664 | −$11.94M |
| 2026-09-16 | Ban Seng Teh | EVP & Chief Commercial Officer | MIXED | — | −$41.24M |
| 2026-09-16 | William D Mosley | CEO | MIXED | +79,110 | −$75.58M |
| 2026-09-15 | Kian Fatt Chong | EVP Global Operations | M | +678 | — |
| 2026-09-15 | John Christopher Morris | EVP & CTO | MIXED | +449 | −$384.95K |
| 2026-09-15 | Gianluca Romano | EVP & CFO | MIXED | −3,860 | −$4.68M |
| 2026-09-15 | William D Mosley | CEO | MIXED | +1,449 | −$1.46M |
| 2026-09-15 | Gianluca Romano | EVP & CFO | MIXED | +4,600 | −$33.05M |
| 2026-09-15 | Ban Seng Teh | EVP & Chief Commercial Officer | MIXED | — | −$770.43K |
| 2026-09-11 | Ban Seng Teh | EVP & Chief Commercial Officer | MIXED | +600 | −$570.24K |
| 2026-09-11 | William D Mosley | CEO | MIXED | +2,380 | −$2.46M |
| 2026-09-11 | Gianluca Romano | EVP & CFO | MIXED | +1,126 | −$1.16M |
| 2026-09-11 | John Christopher Morris | EVP & CTO | MIXED | +558 | −$493.35K |
| 2026-09-11 | Kian Fatt Chong | EVP Global Operations | M | +581 | — |
| 2026-09-03 | Yolanda Lee Conyers | Director | Sell | −750 | −$611.33K |
| 2026-09-03 | William D Mosley | CEO | MIXED | −16,000 | −$23.84M |
| 2026-08-26 | James CI Lee | EVP & CLO | MIXED | −4,981 | −$6.53M |
| 2026-08-24 | John Christopher Morris | EVP & CTO | MIXED | +3,539 | −$3.34M |
| 2026-08-24 | Gianluca Romano | EVP & CFO | MIXED | +7,830 | −$7.71M |
| 2026-08-24 | Kian Fatt Chong | EVP Global Operations | M | +6,846 | — |
| 2026-08-24 | Ban Seng Teh | EVP & Chief Commercial Officer | MIXED | +12,141 | −$4.14M |
| 2026-08-24 | William D Mosley | CEO | MIXED | +15,650 | −$15.41M |
| 2026-08-24 | James CI Lee | EVP & CLO | MIXED | +4,981 | −$3.35M |
| 2026-08-24 | Ban Seng Teh | EVP & Chief Commercial Officer | Sell | −9,862 | −$8.41M |
| 2026-08-14 | Ban Seng Teh | EVP & Chief Commercial Officer | MIXED | −1,359 | −$6.32M |
| 2026-08-11 | Gianluca Romano | EVP & CFO | Sell | −880 | −$743.71K |
| 2026-08-11 | Gianluca Romano | EVP & CFO | Sell | −7,240 | −$5.66M |
| 2026-08-11 | Gianluca Romano | EVP & CFO | Sell | −14,091 | −$11.43M |
| 2026-08-04 | John Christopher Morris | EVP & CTO | Sell | −168 | −$137.38K |
| 2026-08-04 | William D Mosley | CEO | Sell | −17,080 | −$14.13M |
| 2026-08-04 | William D Mosley | CEO | MIXED | +1,080 | −$9.73M |
| 2026-08-03 | James CI Lee | EVP & CLO | Sell | −694 | −$608.95K |
| 2026-07-24 | James CI Lee | EVP & CLO | MIXED | +694 | −$490.74K |
| 2026-07-02 | William D Mosley | CEO | MIXED | −6,657 | −$18.16M |
| 2026-07-02 | William D Mosley | CEO | Sell | −9,343 | −$8.64M |
| 2026-06-15 | William D Mosley | CEO | MIXED | +1,550 | −$1.56M |
| 2026-06-15 | Ban Seng Teh | EVP & Chief Commercial Officer | MIXED | — | −$870.51K |
| 2026-06-15 | Gianluca Romano | EVP & CFO | MIXED | +791 | −$795.03K |
| 2026-06-15 | Kian Fatt Chong | EVP Global Operations | M | +678 | — |
| 2026-06-15 | John Christopher Morris | EVP & CTO | MIXED | −422 | −$1.20M |
| 2026-06-11 | William D Mosley | CEO | MIXED | +2,375 | −$2.35M |
| 2026-06-11 | Kian Fatt Chong | EVP Global Operations | M | +581 | — |
| 2026-06-11 | Ban Seng Teh | EVP & Chief Commercial Officer | MIXED | +599 | −$544.89K |
| 2026-06-11 | John Christopher Morris | EVP & CTO | MIXED | +556 | −$471.43K |
| 2026-06-11 | Gianluca Romano | EVP & CFO | MIXED | +1,123 | −$1.11M |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Dylan G. Haggart | Director | 13,452,232 | $9.37B |
| William D Mosley | CEO | 383,574 | $267.31M |
| Gianluca Romano | EVP & CFO | 120,740 | $84.14M |
| Ban Seng Teh | EVP & Chief Commercial Officer | 35,655 | $24.85M |
| Richard L Clemmer | Director | 34,218 | $23.85M |
| John Christopher Morris | EVP & CTO | 25,749 | $17.94M |
| Kian Fatt Chong | EVP Global Operations | 25,093 | $17.49M |
| Michael R Cannon | Director | 21,147 | $14.74M |
| Judy Bruner | Director | 19,232 | $13.40M |
| Mark Adams | Director | 17,001 | $11.85M |
| Prat Bhatt | Director | 12,869 | $8.97M |
| Stephanie Tilenius | Director | 10,664 | $7.43M |
| Shankar Arumugavelu | Director | 6,626 | $4.62M |
| Robert A Bruggeworth | Director | 6,591 | $4.59M |
| James CI Lee | EVP & CLO | 6,560 | $4.57M |
| Yolanda Lee Conyers | Director | 3,351 | $2.34M |
| Thomas A Szlosek | Director | 357 | $248.79K |
| Jay L Geldmacher | Director | 223 | $155.41K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the STX quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.