Micron down 6%, SK Hynix and SanDisk 5%: why is memory trade crashing?

Micron Technology (NASDAQ: MU) and SanDisk stock (NASDAQ: SNDK) fell sharply in US premarket trading on Tuesday, reversing Monday’s powerful memory-chip rally as investors cut exposure to 2026’s hottest AI winners.

Micron was indicated about 6% lower around 5:30 a.m. ET, while SanDisk was down 5.3%.

SK Hynix’s US-listed ADRs fell about 5.1%, even after its Seoul-listed shares had rallied earlier in the Asian session.

The retreat came without an obvious overnight deterioration in memory demand.

Instead, Nasdaq 100 futures dropped around 1.2% and the 30-year Treasury yield climbed to about 5.33%, its highest in nearly two decades, creating a tougher backdrop for richly valued technology stocks.

Monday’s memory euphoria turns into a sharp reversal

Micron gained 4.1% on Monday, SanDisk jumped 8.9% and SK Hynix’s ADRs added about 3% as investors returned to memory names after July’s violent selloff.

SanDisk had already risen roughly 35% over the five sessions through Friday before extending the rebound Monday.

Fresh enthusiasm came from AI infrastructure spending, SanDisk’s bullish investor-day targets and reports that US officials were discouraging Apple from sourcing memory chips from Chinese suppliers.

Yet the same momentum that powered those gains also leaves the trade vulnerable when investors reduce risk.

AvaTrade analyst Simon Friedman cautioned investors against chasing memory stocks after the rebound, MarketWatch reported, pointing to the sector’s recent volatility and the scale of July’s declines.

Analysts say memory fundamentals have not suddenly cracked

The underlying industry picture remains stronger than Tuesday’s stock moves suggest.

AI data centres continue to consume growing quantities of high-bandwidth memory, DRAM and flash storage while supply remains constrained.

Manufacturers are also signing longer-term customer agreements, improving visibility compared with previous cycles.

“The recent volatility in semiconductor stocks appears disconnected from any material change in long-term fundamentals,” ClearBridge Investments portfolio manager Divya Mathur told Reuters earlier this month.

Mathur added that share prices can react more sharply than the underlying outlook when investors reassess expectations and risk appetite.

Deutsche Bank analyst Melissa Weathers has similarly argued that this memory cycle “is different than others,” according to MarketWatch.

She expects DRAM supply to remain tight through 2027 and into 2028 as AI demand keeps pressure on high-bandwidth memory availability.

Expectations may now be the bigger risk

SanDisk shows why strong fundamentals can still produce violent equity moves.

At its investor day, the company targeted mid-to-high-teens annual revenue growth from fiscal 2028 through 2030 and adjusted gross margins around 80%, supported partly by multiyear customer agreements.

Bank of America analysts said the strategy suggests the memory industry “may be entering a more durable phase” than its historical boom-and-bust pattern, according to MarketWatch.

That optimism is also the problem.

After enormous gains across memory stocks, investors are demanding exceptional results.

Analysts noted that during an earlier August selloff, even strong earnings and upbeat forecasts were failing to satisfy investors because expectations had become so elevated.