STX Seagate Technology Holdings plc Insider Trading

CEO William D Mosley sells 13,780 shares for $12,746,389.45 via 10b5-1 plan; stock up 27.5% in 30d.

William D Mosley, CEO of Seagate Technology Holdings plc, executed 20 separate sales totaling 13,780 shares for $12,746,389.45 on 2026-06-01, reducing his holding by 4.1% to 323,591 shares. This sale was conducted under a pre-arranged 10b5-1 trading plan adopted on 2026-02-18, meaning it was scheduled rather than discretionary. The stock has risen 27.5% over the prior 30 days and 147.1% over the prior 90 days, and Seagate's revenue grew 38.9% year-over-year with net income of $748,000,000.00 in the latest quarter. His prior five sales at STX on 2026-05-20 each showed positive returns in the 20.7%–23.1% range over their respective 30- and 90-day windows, consistent with a pattern of trading into strength. Because this sale is governed by a 10b5-1 plan adopted in February, it reflects a pre-set schedule rather than a real-time market judgment, reducing the interpretive weight typically assigned to insider-initiated timing.

STX CEO William D Mosley sells 16,220 shares for $14,601,434.70 via 29 transactions; scheduled 10b5-1 plan

William D Mosley, CEO of Seagate Technology Holdings plc, executed 29 separate sales totaling 16,220 shares for $14,601,434.70 on 2026-06-01 under a pre-arranged 10b5-1 trading plan adopted on 2026-02-18. This is a scheduled, non-discretionary transaction, so no timing inference is appropriate. Post-transaction, Mosley retains 337,371 shares in non-derivative holdings while maintaining 139,100 shares through derivative securities (NQ Options), representing a -4.6% reduction in the non-derivative portion. The blended average sale price of $900.21 compares favorably to the current price of $926.61, though the stock is -1.5% from its 52-week high of $940.79. Mosley's cross-ticker track record across 20 prior sells shows an average 90-day return of +27.3%; at STX specifically, his five prior sales on 2026-05-20 posted 90-day returns between +20.7% and +23.1%. The continued holdings in both share and derivative form, combined with execution through a pre-scheduled plan rather than discretionary action, indicate the transaction reflects liquidity management within a formal compliance framework rather than a signal of conviction or concern about the company's prospects.

CEO William D Mosley sells 30,000 shares ($22.5M) via scheduled 10b5-1 plan; holdings drop to 339.6K shares.

William D Mosley executed 19 separate sales totaling 30,000 shares for $22,538,568.50 on 2026-05-20 under a pre-arranged 10b5-1 trading plan adopted on 2026-02-18, reducing his holdings from 369.6K to 339.6K shares. The blended average sale price was $751.29, while the current stock price stands at $810.46 and the 30-day change is +44.8% and 90-day change is +97.1%, indicating substantial recent appreciation. Because this transaction is part of a scheduled 10b5-1 plan, it reflects execution of a predetermined schedule rather than a discretionary trading decision, and therefore timing observations are not applicable to this filing. The sale represents an 8.1% reduction of his pre-transaction holdings.

STX CCO Teh Ban Seng sells 15,560 shares for $12.7M via pre-arranged 10b5-1 plan

Teh Ban Seng, EVP & Chief Commercial Officer of Seagate Technology, executed a sale of 15,560 shares for $12,687,979.11 on 2026-05-13 under a pre-arranged 10b5-1 trading plan, which is a scheduled, non-discretionary transaction and therefore does not reflect current investment conviction. STX stock has appreciated significantly, with a 30-day change of +50.86% and 90-day change of +88.9%, but is currently -4.3% from its 52-week high of $841.31. The sale reduces his holdings to 3,691 shares post-transaction and represents his 28th open-market sale at Seagate over the measurement window. While the company shows strong fundamentals with latest quarter revenue of $3,112,000,000.00 and annual revenue growth of +38.9%, the elevated P/E of 116.13 reflects market expectations that may not yet be anchored in sustainable earnings power.

CFO Romano Gianluca sells 1,902 shares of Seagate (STX) for $1.46M; all prior sales poorly timed as stock rose afterward.

Romano Gianluca, Seagate's Chief Financial Officer, sold approximately 4.4% of his holdings in a single transaction. What makes this trade notable is not the sale itself—Gianluca has sold 50 times across all tickers in the prior 3-year window—but his track record at this specific company. Every one of his five prior Seagate sales was poorly timed: the stock rose significantly in the months following each exit. This latest sale follows the same pattern, occurring while the company remains profitable with strong recent quarterly results, and the stock is trading near the upper end of its recent range rather than during a broader market correction. Given that Gianluca has consistently sold on strength rather than weakness at this ticker, and his sales have never preceded declines, this transaction appears reactive rather than a forward-looking signal of management concern about the business.

Seagate CFO Romano Gianluca sells 22,488 shares for $17.4M in single trading day

Romano Gianluca, Seagate's EVP and CFO, disposed of roughly $17.4 million in shares on a single day across 30 separate transactions, representing a net reduction of approximately 4.5% of his largest single tranche position. The stock at the time of the sales was trading modestly below its recent highs, having rallied substantially over the prior quarter. Notably, Gianluca's prior same-ticker sales activity—five sales at this company in late 2025—were uniformly poorly timed: the stock rose significantly in the 90-day period following each prior exit, meaning he sold before each subsequent rally. This current large disposition follows that same pattern of selling before upward moves. While Seagate remains profitable and growing in its latest quarterly results, the CFO's repeated pattern of underestimating near-term price momentum before selling suggests either liquidity needs unrelated to company outlook or a consistent difficulty timing exits at this particular stock. The sheer magnitude and multi-tranche execution of today's sale—characteristic of a planned, deliberate liquidation—sets it apart from routine executive trading and warrants attention for what it may signal about his confidence in near-term performance.

Director Stephanie Tilenius sells ~1,580 shares of Seagate (STX) for ~$1.21M as stock hits 52-week highs.

Director Stephanie Tilenius sold approximately 1,580 shares of Seagate on a single day as the stock reached its 52-week highs, reducing her holdings by roughly 13 percent. The sale occurred at a moment of significant momentum—the stock has rallied substantially over the preceding months—which timing raises the question of whether she was taking advantage of elevated valuation rather than expressing confidence in the company's near-term direction. While Seagate remains profitable and has posted strong recent revenue figures, the company trades at a notably stretched valuation multiple, and the director's decision to trim a meaningful portion of her stake during the stock's peak suggests she may view current prices as an attractive exit opportunity rather than a buy-the-dip moment.

EVP & CLO Lee James Ci sells ~$517K in STX shares near 52-week highs; stock up sharply in recent months, fundamentals show revenue headwinds.

Lee James Ci, Seagate's Executive Vice President and Chief Legal Officer, sold nearly $517K worth of shares — representing roughly two-thirds of his holdings — at a time when the stock is trading at its 52-week high following a sharp rally over the past few months. This timing is notable: Ci has a track record of selling this stock, and his most recent prior sale occurred last summer with mixed outcomes that are still being evaluated. While the company remains profitable, it is facing significant revenue pressure, yet the stock's valuation has expanded considerably even as fundamentals show headwinds. The sale appears to reflect portfolio rebalancing or risk management by an insider selling into strength, rather than conviction in the underlying business direction.

CTO Morris John Christopher sells 5,626 shares of Seagate in 14 transactions totaling $4.15M, extending his three-year pattern of consistent selling.

Morris John Christopher, Executive Vice President and Chief Technology Officer of Seagate, executed 14 sales totaling approximately 5,626 shares on a single date, extending his open-market sales to 19 at this company over the trailing 36 months. His prior five sales at Seagate were all poorly timed—the stock gained significantly after each exit, meaning he missed subsequent appreciation both in the near term and over longer periods. This current sale follows the same pattern: the stock has risen sharply in recent months and now trades near its 52-week high, suggesting the CTO is again selling into strength rather than weakness. The company remains fundamentally strong with growing revenue and solid profitability, but the insider's consistent and repetitive selling—never once buying on the open market—stands in stark contrast to the stock's upward momentum and may reflect personal portfolio management rather than concern about the business itself.