William D. Mosley, CEO of Seagate Technology Holdings (STX), has filed 296 Form 4 transactions across two companies, with a total sell value of $194.7 million and zero open-market purchases. The pattern is uniformly one-directional: every transaction in the recent window is a sale, with the single exception of an option exercise (code M) on September 1, 2026, valued at $647,220, which is mechanical and not a discretionary buy.
The most recent cluster of activity, all on September 1, 2026, consists of 23 open-market sales (code S) in STX, ranging from $66,327.60 to $3,715,738.06. The total for that single day exceeds $25 million. Two additional sales on August 21, 2026, were larger: $2,881,648.50 and $9,604,504.08. The August 21 trades alone account for roughly $12.5 million, and the September 1 batch adds another $25 million, making the last two weeks of filings the dominant share of the overall sell total.
Mosley has not recorded a single open-market purchase (code P) in the data, and his acquired value is zero. The absence of any buy-side activity, combined with the concentration of large sales in a short window, shows a consistent sell bias. The transaction sizes escalate sharply from the smaller September 1 trades to the multi-million dollar sales on August 21, indicating the largest disposals happened first, followed by a series of smaller, more frequent sales. No grants, gifts, or tax-withholding events appear in the recent trades, so the sales are direct dispositions of STX shares.
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