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Western Digital Stock Falls 12% Despite Beating Earnings Estimates

By Sam Quirke. First Published: 8/7/2026.

Western Digital Corporation (NASDAQ: WDC) headed into its earnings report with something to prove. After a blistering rally through the first half of the year, the stock had pulled back sharply, falling roughly 35% from the all-time high it set in June as investors began to question whether the AI storage boom had been overhyped.

That set the stage for a real test. Either the quarter would justify the recent weakness by revealing cracks in the story, or it would prove the doubters wrong and show that the sell-off had gone too far. As it turned out, the numbers landed in the second camp, beating expectations on earnings, revenue and guidance alike.

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And yet, in a twist that captures just how tricky this market has become, Western Digital shares fell anyway, closing 12% lower on Thursday. That reaction leaves investors with an intriguing puzzle: If a beat this convincing could not lift the stock, what exactly is the market so worried about?

A Quarter That Delivered on Almost Every Front

Strip away the share-price reaction, and the results were about as strong as investors could have hoped for. Revenue grew 44% year over year and beat estimates, while earnings also came in comfortably ahead of forecasts.

The standout was margins, which have been the crux of the bull case all along. Both gross and operating margins expanded significantly, reflecting the tight supply and firm pricing that have defined the storage market during the AI boom. This is precisely the margin-driven strength the bulls had been banking on, and it showed up in full.

The demand picture was equally compelling. Cloud customers accounted for the overwhelming majority of revenue, underscoring how central the AI and data center buildout has become to Western Digital's fortunes.

The company also generated strong cash flow, returned a portion of it to shareholders through buybacks and a dividend and, crucially, guided for the current quarter ahead of Wall Street expectations. On paper, this was a near-flawless report.

So, Why Did the Stock Fall?

The reason behind the sell-off lies almost entirely in expectations rather than performance. When a stock goes into an earnings report up more than 175% year to date, a great deal of good news is already baked into the price, and simply meeting a very high bar is often not enough to push it higher.

Beating that bar comfortably, as Western Digital did, can still disappoint a market that had convinced itself an even stronger outcome was coming.

It also didn't help that the wider memory and storage space has turned cautious in recent weeks, with SanDisk Corp.'s (NASDAQ: SNDK) underwhelming outlook in its report likely weighing on sentiment.

What the Bulls and Bears Are Weighing

The core debate now comes down to whether the post-earnings drop is an opportunity or a warning. For the bulls, the investment case is as intact as ever.

Western Digital's demand from AI data centers shows no sign of slowing, pricing remains firm, margins are expanding and management sounded thoroughly confident about the durability of demand heading into the new fiscal year.

The bears, meanwhile, have a couple of fair points beyond the valuation. The most obvious is the sheer concentration of Western Digital's business, with cloud customers now making up almost 90% of revenue. That leaves the company heavily exposed to the fortunes of a small number of data center spenders and vulnerable to any shift in AI sentiment.

Weighing it all up, however, Wall Street remains bullish overall, with the MarketBeat consensus rating currently sitting at a Moderate Buy.

Where This Leaves Investors

For all the drama in the share price, this report arguably strengthened the fundamental case rather than weakening it. The business is firing on all cylinders, the AI-driven demand underpinning it looks durable and the company's own guidance points to further growth ahead.

The post-earnings reaction, on this reading, appears to be more about positioning and lofty expectations, compounded by SanDisk's stumble on guidance, than about anything wrong with the company itself.

Still, given how far and fast it has already run this year and how concentrated its revenue is, buying Western Digital right now may not be as straightforward a trade as it might appear. However, for investors who believe the AI storage boom has further to go, a sharp pullback in a business posting numbers like these may prove to be more of a gift than a warning.