Sandisk Corp (SNDK) Chairman & CEO David Goeckeler sold 14,364 shares on 2026-09-14 at about $1.52K per share, for a total of roughly $21.87 million. The company notes the sale was made under a pre-scheduled Rule 10b5-1 trading plan, meaning the timing and size were set in advance and the trade was not initiated in response to day-to-day developments. Even when planned, a sale of this size by the top executive is notable because CEOs typically have the most complete view of company operations and strategy. For retail investors, the key context is that 10b5-1 plans are commonly used to diversify holdings or manage taxes while reducing concerns about trading on non-public information, which can make the transaction less informative about management’s current view than an open-market sale outside a plan. Recent insider activity at SNDK has been tilted toward selling. In the past 30 days, CFO Luis Felipe Visoso also sold shares worth about $1.57 million on 2026-09-15, following Goeckeler’s larger sale the day before. With two sales and no reported insider buys in that window, the pattern is worth monitoring, particularly whether additional transactions are also tied to pre-set plans.