🕵️ Seagate Technology Holdings PLC ($STX)
SEC insider & ownership activity, last 12 months · CIK 1137789 · every row links its SEC filing
Over the last 12 months insiders sold $563.9M with no open-market buying against it. William D. Mosley sold $281.2M (Oct–Sep). 6 planned sales are pending, the largest $5.1M (Ban Seng Teh). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 11 sellers, $563.9M (670 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| William D. Mosley | 0 | – | 307 | $281.2M | Sep 15, 2026 |
| Romano Gianluca | 0 | – | 174 | $146.4M | Sep 15, 2026 |
| Ban Seng Teh | 0 | – | 107 | $89.3M | Sep 15, 2026 |
| Morris John Christopher | 0 | – | 31 | $22.5M | Sep 15, 2026 |
| James Lee | 0 | – | 37 | $12.6M | Aug 24, 2026 |
| Chong Kian Fatt | 0 | – | 2 | $4.4M | Feb 23, 2026 |
| Shankar Arumugavelu | 0 | – | 2 | $2.4M | Jun 4, 2026 |
| Conyers Yolanda Lee | 0 | – | 4 | $1.8M | Sep 1, 2026 |
| Stephanie Tilenius | 0 | – | 3 | $1.8M | May 5, 2026 |
| Bhatt Prat | 0 | – | 1 | $930K | Jun 2, 2026 |
| Jay Geldmacher | 0 | – | 2 | $751K | Jan 30, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Vanguard Capital Management | 7.5% | 13G | Apr 30, 2026 | filing ↗ | |
| BlackRock, Inc. | 6.1% | 13G | Apr 23, 2025 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Ban Seng Teh | $41.2M | Sep 15, 2026 | filing ↗ |
| Morris John Christopher | $404K | Sep 14, 2026 | filing ↗ |
| Ban Seng Teh | $770K | Sep 14, 2026 | filing ↗ |
| Romano Gianluca | $783K | Sep 14, 2026 | filing ↗ |
| William D. Mosley | $1.5M | Sep 14, 2026 | filing ↗ |
| Gianluca Romano | $43.5M | Sep 11, 2026 | filing ↗ |
| Morris John Christopher | $518K | Sep 10, 2026 | filing ↗ |
| Ban Seng Teh | $570K | Sep 10, 2026 | filing ↗ |
| Romano Gianluca | $1.2M | Sep 10, 2026 | filing ↗ |
| William D. Mosley | $2.6M | Sep 10, 2026 | filing ↗ |
| William D. Mosley | $74.6M | Sep 1, 2026 | filing ↗ |
| Yolanda Conyers | $621K | Sep 1, 2026 | filing ↗ |
| James Lee | $7.7M | Aug 24, 2026 | filing ↗ |
| Morris John Christopher | $3.0M | Aug 21, 2026 | filing ↗ |
| Ban Seng Teh | $8.4M | Aug 21, 2026 | filing ↗ |
| Lee James Ci | $3.4M | Aug 21, 2026 | filing ↗ |
| Romano Gianluca | $7.8M | Aug 21, 2026 | filing ↗ |
| William D. Mosley | $15.5M | Aug 21, 2026 | filing ↗ |
| John Morris | $435K | Aug 20, 2026 | filing ↗ |
| Ban Seng Teh | $5.1M | Aug 20, 2026 | filing ↗ |
| Ban Seng Teh | $6.8M | Aug 13, 2026 | filing ↗ |
| Gianluca Romano | $18.9M | Aug 7, 2026 | filing ↗ |
| James Lee | $531K | Jul 30, 2026 | filing ↗ |
| Lee James Ci | $491K | Jul 23, 2026 | filing ↗ |
| Morris John Christopher | $405K | Jun 12, 2026 | filing ↗ |
| Ban Seng Teh | $871K | Jun 12, 2026 | filing ↗ |
| Romano Gianluca | $785K | Jun 12, 2026 | filing ↗ |
| William D. Mosley | $1.5M | Jun 12, 2026 | filing ↗ |
| Morris John Christopher | $503K | Jun 10, 2026 | filing ↗ |
| Ban Seng Teh | $545K | Jun 10, 2026 | filing ↗ |
| Romano Gianluca | $1.2M | Jun 10, 2026 | filing ↗ |
| William D. Mosley | $2.5M | Jun 10, 2026 | filing ↗ |
| Shankar Arumugavelu | $928K | Jun 4, 2026 | filing ↗ |
| Pratik Bhatt | $921K | Jun 2, 2026 | filing ↗ |
| William D. Mosley | $79.2M | Jun 1, 2026 | filing ↗ |
| William D. Mosley | $22.0M | May 20, 2026 | filing ↗ |
| Ban Seng Teh | $6.5M | May 14, 2026 | filing ↗ |
| Ban Seng Teh | $6.1M | May 13, 2026 | filing ↗ |
| Gianluca Romano | $18.8M | May 6, 2026 | filing ↗ |
| Stephanie Tilenius | $1.2M | May 5, 2026 | filing ↗ |
| John Morris | $4.9M | May 4, 2026 | filing ↗ |
| James Lee | $507K | May 4, 2026 | filing ↗ |
| William Mosley | $7.8M | Apr 1, 2026 | filing ↗ |
| John Morris | $42K | Mar 13, 2026 | filing ↗ |
| William Mosley | $8.2M | Mar 2, 2026 | filing ↗ |
| Yolanda Conyers | $612K | Mar 2, 2026 | filing ↗ |
| John Morris | $98K | Feb 24, 2026 | filing ↗ |
| Kian Fatt Chong | $2.4M | Feb 23, 2026 | filing ↗ |
| William Mosley | $8.2M | Feb 2, 2026 | filing ↗ |
| Ban Seng Teh | $8.9M | Jan 29, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Unregistered equity sale (3.02) | Sep 8, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Sep 8, 2026 | filing ↗ |
| Other events (8.01) | Sep 8, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 8, 2026 | filing ↗ |
| Officer/director changes (5.02) | Sep 2, 2026 | filing ↗ |
| Earnings (2.02) | Jul 28, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jul 28, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 28, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jun 11, 2026 | filing ↗ |
| Other events (8.01) | Jun 11, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 11, 2026 | filing ↗ |
| Unregistered equity sale (3.02) | May 26, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 26, 2026 | filing ↗ |
| Other events (8.01) | May 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 26, 2026 | filing ↗ |
| Unregistered equity sale (3.02) | May 20, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 20, 2026 | filing ↗ |
| Other events (8.01) | May 20, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 20, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 5, 2026 | filing ↗ |
| Earnings (2.02) | Apr 28, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 28, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 28, 2026 | filing ↗ |
| Unregistered equity sale (3.02) | Feb 17, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 17, 2026 | filing ↗ |
| Other events (8.01) | Feb 17, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 17, 2026 | filing ↗ |
| Unregistered equity sale (3.02) | Feb 11, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 11, 2026 | filing ↗ |