Semiconductor stocks led the broader market lower on Monday, with Micron Technology falling 9% and SanDisk dropping 8% in a session dominated by war escalation fears and growing concern about supply chain disruptions to chip manufacturing [1].

The selloff reversed weeks of relative strength in memory chip stocks, which had benefited from surging DRAM and NAND flash prices — up as much as 180% since the Lunar New Year according to industry tracker TrendForce. Micron had been one of the few bright spots in a difficult 2026, with the stock projected to account for 19% of entire S&P 500 earnings growth this year.

Monday's decline was driven by the convergence of two risks. First, Trump's Financial Times interview escalating the Iran conflict raised the specter of broader economic damage that would reduce demand for consumer electronics and enterprise hardware. Second, the helium supply crisis — Qatar provides critical helium for semiconductor fabrication — threatens production capacity at facilities worldwide.

Every Magnificent Seven stock is now negative for 2026, and the semiconductor sector is no longer insulated. Morgan Stanley noted in a March 19 report that memory stocks face "binary risk" from the conflict: prices benefit from supply disruption, but demand destruction could overwhelm the supply premium.

The broader market context is dire. Fred Hickey of The High-Tech Strategist noted that Counterpoint Research has issued "the sharpest decline on record" forecast for the 2026 smartphone market, a key demand driver for memory chips.

Micron is down over 24% from its recent high of $471.34. SanDisk has fallen nearly 21% from $777.60.

-- THEO KAPLAN, New York