William D Mosley insider trades: Seagate Technology Holdings (STX) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where William reports to the SEC
Open-market buys and sales
73 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Nov 2, 2026 | STX | ↓ Sell | 23,280 | $602.44 | $14.0M | Direct | Nov 3, 2026 (1d) |
| Nov 2, 2026 | STX | ↓ Sell10b5-1 | 6,720 | $622.82 | $4.2M | Direct | Nov 3, 2026 (1d) |
| Oct 1, 2026 | STX | ↓ Sell | 18,998 | $914.67 | $17.4M | Direct | Oct 2, 2026 (1d) |
| Oct 1, 2026 | STX | ↓ Sell10b5-1 | 11,002 | $935.60 | $10.3M | Direct | Oct 2, 2026 (1d) |
| Sep 15, 2026 | STX | ↓ Sell | 97,889 | $772.14 | $75.6M | Direct | Sep 16, 2026 (1d) |
| Sep 14, 2026 | STX | ↓ Sell | 1,870 | $781.23 | $1.5M | Direct | Sep 15, 2026 (1d) |
| Sep 10, 2026 | STX | ↓ Sell | 4,165 | $862.13 | $3.6M | Direct | Sep 11, 2026 (1d) |
| Sep 1, 2026 | STX | ↓ Sell | 30,000 | $816.28 | $24.5M | Direct | Sep 3, 2026 (2d) |
| Aug 21, 2026 | STX | ↓ Sell | 18,139 | $849.35 | $15.4M | Direct | Aug 24, 2026 (3d) |
| Aug 3, 2026 | STX | ↓ Sell10b5-1 | 17,080 | $827.30 | $14.1M | Direct | Aug 4, 2026 (1d) |
| Aug 3, 2026 | STX | ↓ Sell | 12,920 | $803.47 | $10.4M | Direct | Aug 4, 2026 (1d) |
| Jul 1, 2026 | STX | ↓ Sell | 20,657 | $910.48 | $18.8M | Direct | Jul 2, 2026 (1d) |
| Jul 1, 2026 | STX | ↓ Sell10b5-1 | 9,343 | $924.42 | $8.6M | Direct | Jul 2, 2026 (1d) |
| Jun 12, 2026 | STX | ↓ Sell | 1,768 | $880.19 | $1.6M | Direct | Jun 15, 2026 (3d) |
| Jun 10, 2026 | STX | ↓ Sell | 2,855 | $821.74 | $2.3M | Direct | Jun 11, 2026 (1d) |
| Jun 1, 2026 | STX | ↓ Sell | 16,220 | $900.21 | $14.6M | Direct | Jun 2, 2026 (1d) |
| Jun 1, 2026 | STX | ↓ Sell10b5-1 | 13,780 | $924.99 | $12.7M | Direct | Jun 2, 2026 (1d) |
| May 20, 2026 | STX | ↓ Sell10b5-1 | 30,000 | $751.29 | $22.5M | Direct | May 21, 2026 (1d) |
| Apr 1, 2026 | STX | ↓ Sell10b5-1 | 20,000 | $420.73 | $8.4M | Direct | Apr 2, 2026 (1d) |
| Mar 19, 2026 | STX | ↓ Sell | 24,584 | $406.77 | $10.0M | Direct | Mar 23, 2026 (4d) |
| Mar 2, 2026 | STX | ↓ Sell10b5-1 | 20,000 | $384.76 | $7.7M | Direct | Mar 3, 2026 (1d) |
| Feb 2, 2026 | STX | ↓ Sell10b5-1 | 20,000 | $429.27 | $8.6M | Direct | Feb 3, 2026 (1d) |
| Jan 2, 2026 | STX | ↓ Sell10b5-1 | 20,000 | $285.56 | $5.7M | Direct | Jan 6, 2026 (4d) |
| Dec 1, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $271.03 | $5.4M | Direct | Dec 2, 2025 (1d) |
| Nov 3, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $262.82 | $5.3M | Direct | Nov 5, 2025 (2d) |
| Oct 1, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $249.90 | $5.0M | Direct | Oct 3, 2025 (2d) |
| Sep 2, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $168.97 | $3.4M | Direct | Sep 4, 2025 (2d) |
| Aug 1, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $153.75 | $3.1M | Direct | Aug 4, 2025 (3d) |
| Jul 1, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $144.66 | $2.9M | Direct | Jul 2, 2025 (1d) |
| Jun 9, 2025 | STX | ↓ Sell | 54,347 | $130.19 | $7.1M | Direct | Jun 10, 2025 (1d) |
| Jun 3, 2025 | STX | ↓ Sell10b5-1 | 70,000 | $119.87 | $8.4M | Direct | Jun 4, 2025 (1d) |
| May 22, 2025 | STX | ↓ Sell10b5-1 | 70,000 | $109.47 | $7.7M | Direct | May 23, 2025 (1d) |
| Apr 1, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $84.56 | $1.7M | Direct | Apr 2, 2025 (1d) |
| Mar 3, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $101.57 | $2.0M | Direct | Mar 4, 2025 (1d) |
| Feb 3, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $94.13 | $1.9M | Direct | Feb 5, 2025 (2d) |
| Jan 2, 2025 | STX | ↓ Sell10b5-1 | 20,000 | $86.65 | $1.7M | Direct | Jan 6, 2025 (4d) |
| Dec 2, 2024 | STX | ↓ Sell10b5-1 | 20,000 | $102.83 | $2.1M | Direct | Dec 4, 2024 (2d) |
| Nov 1, 2024 | STX | ↓ Sell10b5-1 | 20,000 | $99.53 | $2.0M | Direct | Nov 4, 2024 (3d) |
| Oct 1, 2024 | STX | ↓ Sell10b5-1 | 20,000 | $107.68 | $2.2M | Direct | Oct 2, 2024 (1d) |
| Sep 26, 2024 | STX | ↓ Sell10b5-1 | 141,785 | $110.18 | $15.6M | Direct | Sep 27, 2024 (1d) |
| Sep 3, 2024 | STX | ↓ Sell10b5-1 | 20,000 | $97.18 | $1.9M | Direct | Sep 5, 2024 (2d) |
| Aug 7, 2024 | STX | ↓ Sell10b5-1 | 20,000 | $93.46 | $1.9M | Direct | Aug 9, 2024 (2d) |
| Mar 9, 2024 | STX | ↓ Sell | 1,000 | $92.69 | $93K | Direct | Mar 12, 2024 (3d) |
| Dec 9, 2023 | STX | ↓ Sell10b5-1 | 154,584 | $80.21 | $12.4M | Direct | Dec 12, 2023 (3d) |
| Sep 1, 2023 | STX | ↓ Sell10b5-1 | 298,860 | $71.17 | $21.3M | Direct | Sep 5, 2023 (4d) |
| Sep 1, 2021 | STX | ↓ Sell10b5-1 | 31,500 | $86.95 | $2.7M | Direct | Sep 3, 2021 (2d) |
| May 3, 2021 | STX | ↓ Sell10b5-1 | 77,754 | $92.49 | $7.2M | Direct | May 5, 2021 (2d) |
| Sep 6, 2019 | STX | ↓ Sell10b5-1 | 90,000 | $54.31 | $4.9M | Direct | Sep 10, 2019 (4d) |
| Feb 24, 2017 | STX | ↓ Sell10b5-1 | 38,581 | $47.28 | $1.8M | Direct | Feb 28, 2017 (4d) |
| Apr 10, 2015 | STX | ↓ Sell10b5-1 | 58,581 | $55.51 | $3.3M | Direct | Apr 14, 2015 (4d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other STX insiders
Open-market trades in the last 12 months
About William D Mosley's insider trades
William D Mosley is CEO at Seagate Technology Holdings (STX). Since Oct 27, 2009, William has reported no open-market purchases and 73 sales worth $495.9M on SEC Form 4. In the last 12 months: 24 sales ($318.0M).
52 sales (55% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include option exercises (60 filings), grants and awards (46 filings), shares withheld for taxes (39 filings), other transactions (5 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every STX insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.