Micron falls 6%, SanDisk 5% as memory trade reverses sharply

Micron Technology fell about 6 percent in premarket trading Tuesday, with SanDisk down 5 percent and SK Hynix sliding similarly, reversing Monday's rally as investors cut exposure to AI's biggest winners.

The pullback follows a record earnings season that lifted S&P 500 second-quarter profit growth to 50.4 percent, the fastest since Q2 2021, according to FactSet data. Alphabet posted a 216 percent EPS beat, though $6.26 of that came from unrealized equity gains, a Seeking Alpha analysis found.

The selloff comes as US-Iran tensions escalated, with President Trump threatening to bomb Oman over a reported deal with Iran to assert control of the Strait of Hormuz, according to Yahoo Finance. Elevated oil prices revived inflation concerns, while a key Treasury yield hit a 19-year high. September Fed hike odds fell to 30 percent.

The memory complex has been among 2026's best-performing sectors, driven by AI demand for high-bandwidth memory. A sustained correction could ripple through the broader semiconductor sector and tech indices, given how much of the index-level earnings growth these names supplied.

US stock futures fell Tuesday as rising tensions between the US and Iran revived inflation concerns, with elevated oil prices adding pressure. Dow futures slipped while S&P 500 futures showed modest gains, reflecting mixed sentiment across sectors.

Earnings Boom Masks Concentration Risk

The S&P 500's headline earnings growth of 50.4 percent flatters the underlying picture. Without Alphabet and Amazon, growth drops to 32 percent, meaning the two companies supplied 18.4 percentage points of the headline figure. Blended net profit margin hit 16.9 percent, a record since FactSet began tracking in 2009 — but without Alphabet and Amazon, it falls to 15 percent.

FactSet had 2026 earnings growing 15 percent last December and 30 percent by August 7. Doubling a growth forecast in eight months is unusual, and it suggests the market has priced in aggressive AI-driven earnings expansion. When expectations run that hot, any wobble in the macro environment can trigger sharp profit-taking.

The concentration risk is particularly acute in the memory segment. Micron, SanDisk, and SK Hynix have been among the primary beneficiaries of AI infrastructure spending, as hyperscalers and cloud providers compete for high-bandwidth memory supply. That demand has driven a historic upcycle, but it also means these stocks carry outsized expectations relative to the broader market.

Oil, Iran Tensions Add Pressure

The geopolitical backdrop is adding to the pressure. President Trump's threat to bomb Oman — a US ally — over a reported deal with Iran to assert control of the Strait of Hormuz has pushed oil prices higher, reviving inflation concerns. Higher energy costs feed into broader inflation measures, which could force the Federal Reserve to keep rates higher for longer.

A key Treasury yield hit a 19-year high, reflecting these inflation concerns. September Fed hike odds fell to 30 percent, suggesting the market is pricing in a more hawkish path. For high-multiple tech stocks, higher rates are a direct headwind, as they reduce the present value of future earnings.

Investment Impact

For investors, the question is whether this is a buying opportunity or the start of a deeper correction. The memory trade has been one of 2026's most crowded positions, and crowded trades can unwind quickly. Micron, SanDisk, and SK Hynix all benefited from AI-driven demand for high-bandwidth memory, but valuations had stretched significantly.

The broader semiconductor sector will be watching closely. If the correction deepens, it could drag down the entire tech complex. But if this is just profit-taking after a record run, the memory names could find support at lower levels. The key variable is whether the macro headwinds — oil prices, inflation, and higher rates — persist or fade in the coming weeks.

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