TradingKey – SanDisk Corporation (NASDAQ: SNDK) had one of its worst trading sessions of the year in the two days before the July 4 holiday, losing about 10% on one day and 14% the next. The stock has been confused with its former parent, Western Digital (NASDAQ: WDC), and the two have been trading separately since SanDisk’s spinoff was completed in February 2026. It is SanDisk’s flash-memory business, not Western Digital’s hard-drive operations, that has become one of the most talked-about AI trades of 2026 — and the one that just hit a wall.