CEO Mosley Files to Sell 90,000 Shares (~$74.6M) Under 10b5-1 Plan
STX has more than doubled off its 52-week low of $163.86.
Summary
Seagate CEO William Mosley filed to sell 90,000 shares (~$74.6M) under a 10b5-1 plan, adding to $68.9M in recent insider sales.
Key Events · Ownership and Investor Activity · STX
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CEO Files to Sell 90,000 Shares
William Mosley filed a Form 144 to sell 90,000 shares (~$74.6M) on 09/01/2026, including 42,000 from option exercises and 48,000 from vested RSUs/PSUs.
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10b5-1 Plan Governs Sale
The sale is executed under a pre-existing 10b5-1 trading plan adopted 02/18/2026, indicating a pre-planned disposition.
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Recent Insider Selling Pattern
Mosley sold $68.9M in the past three months, including $15.4M on 08/21/2026 and $24.5M on 08/03/2026, contributing to $108.9M in net insider sales over 90 days.
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Ongoing Distribution
This is the 22nd Form 144 filing in 90 days, reflecting sustained insider selling despite strong Q4 results and a $1,400 price target from Rosenblatt.
Analysis · STX · Technology
CEO William Mosley has filed a Form 144 to sell 90,000 shares worth approximately $74.6 million, with the sale governed by a 10b5-1 plan adopted in February 2026. This follows $68.9 million in sales over the past three months, including a $15.4 million sale on August 21. The filing is part of a broader insider distribution pattern at Seagate, with net insider sales of $108.9 million over 90 days. While the sale is pre-planned, the size and executive role make it notable for investors.
How filings like this one have moved
In the 30 days to Oct 16, 2026, 29.4% of the 1487 measured filings Wiseek scored 7 moved their stock by 5% or more by the next session's close. The median move was -0.39%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, STX was trading at $815.00 on NASDAQ in the Technology sector, with a market capitalization of approximately $185.1B. The 52-week trading range was $163.86 to $1,145.00. This filing was assessed with negative market sentiment and an importance score of 7 out of 10.