Micron drops 7% as memory rivals' spending stokes oversupply fears

Micron Technology Inc. shares fell 7% to $917 on Monday, tracking SK Hynix lower, as investors grew concerned that record capital spending by memory rivals could flood the market and compress margins in the industry's most lucrative cycle.

"The market is starting to price in the risk that peak margins are behind us," said Rachel Kim, semiconductor analyst at Edgen. "Samsung and SK Hynix are spending at levels that historically precede oversupply, and the sell-off reflects that fear."

The sell-off swept the sector. SanDisk Corp. dropped 7% to $1,616, Western Digital Corp. fell 7% to $537, and Seagate Technology Holdings PLC lost 5% to $822. The Roundhill Memory ETF declined 6% to $61. The moves came after Samsung Electronics Co. reported a preliminary second-quarter operating profit of about $58 billion — a 19-fold jump from a year earlier — only to see its own shares fall as much as 10% in Seoul. SK Hynix Inc., which made its Nasdaq debut last week, saw its stock plunge 10%.

The paradox of record earnings triggering a sell-off highlights a central tension in memory investing. Micron's fiscal third-quarter revenue surged 346% year over year to a record $41.5 billion, with adjusted gross margin reaching 84.9%. The company guided for fiscal fourth-quarter revenue of about $50 billion. Yet the stock trades at roughly 8 times run-rate earnings — a multiple that implies the market expects a sharp earnings decline. The question is not whether the cycle will turn, but when.

The Spending Spree That Could Break the Boom

Samsung and SK Hynix are pouring billions into new capacity for high-bandwidth memory (HBM) and advanced DRAM, the chips that power Nvidia Corp.'s AI accelerators. HBM, which stacks memory dies vertically to deliver vastly higher bandwidth than traditional DRAM, has become the industry's most profitable product line. But building HBM capacity requires massive upfront investment in advanced packaging and wafer fabrication equipment.

Deutsche Bank analysts noted that Samsung's results came in only 6% ahead of estimates, suggesting the market had already priced in the boom. The concern now is that the spending required to meet AI demand will eventually outpace it, creating a supply glut that crushes average selling prices across DRAM and NAND.

A 242% Rally Meets Reality

Micron shares had surged 242% year to date before Monday's decline, crossing $1 trillion in market value in May alongside Samsung and SK Hynix. The rally reflected investor conviction that AI-driven demand for memory would remain structurally higher than in previous cycles. Micron's own guidance supports that view: the company said it expects market tightness for DRAM and NAND to persist beyond 2027.

But history argues caution. Memory is a deeply cyclical industry where booms are followed by busts. The bigger the profit surge, the harder the correction tends to be. At 21 times trailing earnings, Micron's valuation looks reasonable — but on peak-cycle earnings, the forward multiple of 8 times suggests the market is already discounting a downturn.

For investors, the sell-off presents a dilemma. The bull case — that AI-driven demand makes this cycle structurally different — is supported by Micron's $50 billion revenue guidance and the persistent HBM shortage. The bear case is that Samsung and SK Hynix's spending will eventually close the gap, compressing margins across the sector. UBS and Bank of America have framed the pullback as a healthy reset, but with memory stocks still up more than 200% year to date, the risk of further profit-taking remains elevated.

This article is for informational purposes only and does not constitute investment advice.