William D. Mosley is CEO at Seagate Technology plc (STX). They have made 20 open-market trades across 1 company since 2009, most recently 2026-10-01.
CIK 0001388390
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 20 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| STX | 373,110 | $238.5M |
| CRUS | 3,622 | $390K |
| Total | $238.9M |
Shares reported on the most recent Form 4, priced at the 2026-10-02 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| STX | SELL · 10b5-1 | 2026-10-01 | 2026-10-02 | $935.60 | $10.3M | -18.7% | — | — |
| STX | SELL · 10b5-1 | 2026-10-01 | 2026-10-02 | $914.67 | $17.4M | -18.7% | — | — |
| STX | SELL | 2026-09-15 | 2026-09-16 | $772.15 | $75.6M | +14.7% | -20.4% | — |
| STX | SELL | 2026-09-14 | 2026-09-15 | $781.54 | $1.5M | +16.8% | -12.0% | — |
| STX | SELL | 2026-09-10 | 2026-09-11 | $862.51 | $2.5M | +18.8% | -3.2% | — |
| STX | SELL · 10b5-1 | 2026-09-01 | 2026-09-03 | $816.28 | $24.5M | -4.2% | +8.5% | — |
| STX | SELL | 2026-08-21 | 2026-08-24 | $849.43 | $15.4M | -1.3% | +14.3% | — |
| STX | SELL · 10b5-1 | 2026-08-03 | 2026-08-04 | $803.47 | $10.4M | +14.9% | -5.7% | — |
| STX | SELL · 10b5-1 | 2026-08-03 | 2026-08-04 | $827.30 | $14.1M | +14.9% | -5.7% | — |
| STX | SELL · 10b5-1 | 2026-07-01 | 2026-07-02 | $924.42 | $8.6M | -4.0% | -3.6% | +7.0% |
| STX | SELL · 10b5-1 | 2026-07-01 | 2026-07-02 | $910.48 | $18.8M | -4.0% | -3.6% | +7.0% |
| STX | SELL | 2026-06-12 | 2026-06-15 | $880.31 | $1.6M | -14.2% | -20.8% | -23.0% |
| STX | SELL | 2026-06-10 | 2026-06-11 | $821.96 | $2.3M | +12.5% | -2.5% | +0.3% |
| STX | SELL · 10b5-1 | 2026-06-01 | 2026-06-02 | $924.99 | $12.7M | -1.2% | -12.9% | -12.1% |
| STX | SELL · 10b5-1 | 2026-06-01 | 2026-06-02 | $900.21 | $14.6M | -1.2% | -12.9% | -12.1% |
| STX | SELL · 10b5-1 | 2026-05-20 | 2026-05-21 | $751.29 | $22.5M | +15.7% | +34.5% | +2.4% |
| STX | SELL · 10b5-1 | 2026-04-01 | 2026-04-02 | $420.73 | $8.4M | +15.2% | +63.8% | +103.1% |
| STX | SELL | 2026-03-19 | 2026-03-23 | $406.77 | $10.0M | +6.6% | +43.9% | +171.6% |
| STX | SELL | 2026-03-02 | 2026-03-03 | $384.76 | $7.7M | +4.4% | +16.8% | +150.7% |
| STX | SELL | 2026-02-02 | 2026-02-03 | $429.27 | $8.6M | -3.6% | -16.9% | +67.1% |
| STX | SELL | 2026-01-02 | 2026-01-06 | $285.56 | $5.7M | +2.3% | +27.1% | +42.1% |
| STX | SELL · 10b5-1 | 2025-12-01 | 2025-12-02 | $271.02 | $10.8M | +7.9% | +7.9% | +42.4% |
| STX | SELL · 10b5-1 | 2025-11-03 | 2025-11-05 | $263.80 | $8.8M | -5.7% | +0.5% | +60.3% |
| STX | SELL · 10b5-1 | 2025-10-01 | 2025-10-03 | $251.44 | $6.8M | -15.7% | +2.1% | +10.5% |
| STX | SELL · 10b5-1 | 2025-09-02 | 2025-09-04 | $168.74 | $5.5M | +13.5% | +30.6% | +39.1% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.