Micron's Revenue More Than Quadrupled. Its Stock Just Fell 26% Anyway.

On Friday, memory chip stocks fell together in a way that had nothing to do with any of their own earnings. SK Hynix and Micron each dropped 6%, SanDisk fell 9%, Western Digital slid 6%, and the Roundhill Memory ETF, which tracks the group, lost 7% to close near $54. The trigger wasn't a warning or a miss. It was an overnight selloff in Seoul, where Samsung and SK Hynix led South Korea's KOSPI index lower, and U.S. names followed in sympathy because these stocks now trade as a single, tightly correlated basket.

That single session is really a smaller chapter in a bigger one. Since July 1, Micron is down 26% and SanDisk has fallen 40%, even after both stocks had already delivered some of the best returns in the market this year. Micron's stock climbed more than 300% through the first half of 2026, and SanDisk was up 858% over the same stretch. Neither company did anything to justify giving that much back. Micron's most recent quarter was, by almost every measure, the best in its history.

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Key Takeaways

• Micron, SanDisk, SK Hynix and Western Digital all fell 6-9% on Friday in a Korea-led selloff, even though none of them reported new negative news that day.

• Since July 1, Micron is down 26% and SanDisk is down 40%, unwinding part of first-half gains of more than 300% and 858%, respectively.

• Micron's fiscal Q3 revenue hit $41.46 billion, up 345.7% year-over-year, with non-GAAP gross margin near 85% (versus 39% a year ago) and record free cash flow of $18.3 billion.

• The company's own guidance points the other way from a selloff: management expects memory market tightness to persist beyond 2027, and Q4 guidance calls for roughly $50 billion in revenue and $31 in adjusted earnings per share.

• Even after the run, Micron trades near 12x forward earnings against the S&P 500's roughly 21x, and closer to 7x if you annualize the guided Q4 number — cheap for a company posting these margins, which is exactly the tension driving the debate.

What Changed

The memory chip trade has been one of 2026's clearest AI-adjacent stories. Three companies, Samsung, SK Hynix, and Micron, control roughly 90-95% of global DRAM production, and none of them were prepared for how much memory AI infrastructure would actually consume. A high-end PC carries around 32 gigabytes of DRAM. A smartphone needs 8 to 12. Nvidia's Blackwell architecture integrates up to 192 gigabytes per chip. Multiply that gap by the number of AI accelerators hyperscalers are buying, and you get demand that simply didn't exist in the memory market's planning models three years ago.

High-bandwidth memory, the specialized DRAM that AI chips need, is expected to make up roughly a quarter of total DRAM wafer output this year, growing at close to 70% annually. Every wafer redirected to HBM is a wafer not making conventional memory for PCs and phones, which is part of why DRAM contract prices jumped 50-55% quarter-over-quarter earlier this year. That squeeze is what turned Micron and SanDisk into two of the best-performing large-cap stocks of the first half. Friday's selloff, and the broader slide since July 1, is the market testing whether that story still holds at these prices, not new evidence that it's broken.

Why It Matters

The gap between Micron's numbers and Micron's stock price is the real story here, more than any single day's decline. A company that just grew revenue more than fourfold, more than doubled its gross margin, and generated a record $18.3 billion in free cash flow in a single quarter is not a company in trouble. Management said as much directly, telling investors tightness in the memory market should last beyond 2027, which is a call for continued scarcity, not the early signs of a glut. If that guidance holds, a stock trading at roughly 7 times an annualized Q4 estimate isn't pricing in the numbers the company is actually putting up.

But markets don't just price a quarter, they price a path, and the path for memory has looked euphoric enough to invite exactly this kind of pullback. Stocks that ran 300% to 858% in six months carry embedded assumptions well beyond "the current quarter was good." Historically, memory has been one of the most cyclical corners of semiconductors: shortages draw in enormous capital spending, that spending eventually becomes supply, and supply eventually becomes a price war. New fabs from Samsung, SK Hynix, and Micron aren't expected to reach production until 2027 or 2028, which is exactly why the bulls argue this cycle looks different. It's also exactly the kind of two-year gap that makes a highly levered, highly correlated trade vulnerable to any headline that makes investors nervous about what happens once that capacity finally lands.

What to Watch Next

The clearest read on which side is right will come from Samsung's and SK Hynix's own upcoming results and any commentary on 2027 capacity plans, since a genuine change in the supply outlook would show up there before it shows up in Micron's numbers. Worth tracking alongside that: DRAM and NAND contract pricing trends into the fourth quarter, hyperscaler capital spending commentary as AI infrastructure earnings season continues, and whether the Roundhill Memory ETF stabilizes or keeps sliding, which would say more about how crowded this trade had become than about the chips themselves.

The Pulse24 Take

This reads less like memory chips breaking than like a trade getting tested. The fundamentals genuinely support the bull case right now: real scarcity, an oligopoly supply structure, a company on record saying the shortage extends past 2027, and a valuation that still looks inexpensive relative to the growth on the page. None of that guarantees the stock reaction was wrong, because a 300%-to-858% run in six months prices in a lot of future good news, and Friday's Korea-led selloff is a reminder of how quickly sentiment can reset once a trade gets that crowded.

What we'd watch for is whether the next leg of this trades on actual data, weaker guidance, softer contract pricing, capacity coming online faster than expected, or whether it keeps moving on sympathy and macro noise the way Friday did. Those are two very different stories. One says the AI memory shortage is starting to end. The other says a very good trade just got a very normal gut check after an abnormal run.