Sandisk and Western Digital slide as high expectations hit chip stocks

Sandisk and Western Digital shares fell hard in premarket trading Thursday after quarterly results failed to keep pace with a semiconductor rally already lifted by AI optimism. Sandisk sank 13.3% to $1,178, while Western Digital dropped 19.1% to $420, a sharp reminder that even strong numbers can disappoint when investors have set the bar near perfection.

Both storage makers had topped Wall Street’s estimates, yet the market still punished the stocks. Sandisk had already helped raise expectations the day before by forecasting upbeat quarterly revenue on AI-driven demand, which made the follow-through even more important and left little room for anything less than exceptional guidance.

The reaction fit a wider pattern across technology in 2026. Investors have become far more selective, rewarding companies only when results clearly exceed already high expectations. In semiconductors, where AI spending has pushed valuations higher, that has made the market less forgiving of cautious commentary, slower growth or anything that hints the next leg of demand may not be as strong as hoped.

For storage names, the pressure is especially intense because demand can swing with pricing cycles, inventory trends, data-center spending and consumer electronics sales. A company can benefit when customers rush to build capacity, but that same strength can set up oversupply later if supply chains overreact. That cyclical risk makes Sandisk and Western Digital closely watched indicators for storage demand, and it helps explain why investors react so quickly to any sign that the cycle may be cooling.

The selloff also raised a broader question for chip stocks: whether the semiconductor rally is getting ahead of fundamentals. AI enthusiasm has clearly improved sentiment across the sector, but the latest move showed that benchmark-beating results are no longer enough on their own. Investors want evidence that growth is durable, pricing power is holding and demand can keep compounding after the initial AI surge.

For now, Sandisk and Western Digital are trading like names that have already priced in a very favorable future. The market reaction suggested that in this corner of tech, strong earnings are still only the starting point.