William D. Mosley, CEO of Seagate Technology Holdings (STX), has filed 342 Form 4 transactions across two companies, with a total sell value of $297,954,376 and zero buy value. The pattern is one-directional: every trade in the record is an open-market sale, coded "S," with no purchases, grants, or option exercises appearing in the recent activity. The most recent cluster, dated October 1, 2026, contains 25 separate sales in STX, ranging from $37,648.80 to $1,550,105.01. Combined, those October transactions alone exceed $17 million in disposed stock.
The concentration in a single date and ticker suggests a systematic liquidation rather than sporadic decision-making. The largest single sale on that day was $1,550,105.01, followed by $1,230,288.58, while smaller tranches of $37,648.80 and $75,216 indicate tiered execution across multiple blocks. Across the entire filing history, Mosley has not recorded a single open-market purchase, which means his insider activity is entirely sell-side. The absence of "P" codes, which the SEC legend treats as the only conviction-buying signal, reinforces that bias.
The two companies involved are not named beyond STX in the recent data, but the scale of total sales, nearly $298 million, points to a substantial equity position being reduced over time. The October 1 trades are all same-day, which is typical of a planned sell-down, possibly under a Rule 10b5-1 plan, though the filings do not specify that. For investors tracking insider behavior, the takeaway is clear: Mosley has not added a single share in the open market, and his recent activity is a steady stream of sales with no offsetting buys.
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