According to the latest Form 4 filing, Seagate Technology Holdings plc (STX) Director and CEO William D. Mosley exercised stock options on August 3, 2026 (transaction code M) at an exercise price of $46.23, acquiring 14,000 ordinary shares. On the same day, under a Rule 10b5-1 trading plan, he executed multiple open‑market sales (transaction code S) totaling approximately 20,723 shares, at weighted‑average prices ranging from about $783.83 to $818.58 per share. Following these transactions, Mosley directly holds roughly 312,597 ordinary shares and retains about 111,100 stock options. As these trades were conducted under a pre‑established 10b5-1 plan, they are consistent with planned diversification or liquidity actions, reducing concerns over ad hoc insider selling. However, sizable CEO share sales can still be viewed as a modestly negative short‑term signal, and investors should evaluate them alongside Seagate’s fundamentals, earnings outlook, and valuation.