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SanDisk plummeted 9% yesterday, hitting a low of 1600 intraday. The storage sector collectively collapsed: Kioxia ADR dropped over 13%, SK Hynix and Seagate fell more than 9%, Western Digital and Micron declined over 7%. But the most striking thing about this bearish candle is the background — it surged nearly 9% just on Monday, and a week ago on August 6, after its earnings report, it once plunged 13% intraday to 1163, then rebounded to close at 1786 on Monday, rising over 50% in less than two weeks. This is not a stock, it’s a roller coaster. The direct trigger was a Morgan Stanley report: SanDisk is the most crowded semiconductor stock among institutions, with an overweight position 2.3 percentage points higher than its S&P weight, combined with AI hardware funds rotating out, triggering profit-taking stampede. The real divergence lies in valuation. Bulls say: $93.9 billion long-term supply contracts in hand — signed minimum purchase agreements spanning several years with 8 major customers, locking in volume and price in advance, so even if the market falls, customers must buy and pay per contract. The total contract size is equivalent to 4.6 times its annual revenue, basically securing income for several years ahead; JPMorgan target price is 2250. Bears say: Morningstar fair value is only 1000 with a two-star rating; last quarter’s gross margin was 84.6% while the company’s long-term target is only 80%, indicating current profits are clearly at the cycle peak; NAND contract price increases in Q3 dropped sharply from 70% to 10-15%, with price hike momentum rapidly slowing. The market is betting: Is SanDisk an AI growth stock that breaks the storage bull-bear cycle, or a classic trap mistaking cyclical peak profits for perpetual cash flow? At 22x PE, both sides can make a hundred arguments. Just watch the show