Memory chip stocks, including major US-listed companies, experienced a sharp decline on Tuesday, March 4, 2026, driven by escalating geopolitical tensions and rising energy costs. The sell-off was triggered by renewed fears surrounding the Iran conflict, which pushed liquefied natural gas (LNG) prices higher. This directly impacted South Korea, a major LNG importer and home to the world's leading semiconductor manufacturers, Samsung Electronics and SK Hynix.
South Korea's KOSPI index plunged overnight, with SK Hynix falling 11.5% and Samsung dropping 9.9%. This decline carried over to US markets, where SanDisk led losses with an 8.7% drop, followed by Micron Technology (down 8%), Western Digital (down 7.2%), and Seagate (down 5.8%). Lam Research, a key equipment supplier to Korean fabs, also fell around 5%.
The core issue is South Korea's heavy reliance on LNG-fired power plants to run its semiconductor fabrication facilities around the clock. Rising energy costs put significant pressure on operating margins. Analyst Jordan Klein from Mizuho suggested the drop reflected stocks being "overbought" rather than a fundamental change, noting the heavy selling in Asia was worth monitoring for its effect on US holdings.
Despite the sell-off, the broader Wall Street view remains positive, citing strong AI-driven demand, tight supply, and pricing power. Micron Technology is scheduled to report its Q2 FY26 earnings on March 18. UBS analyst Timothy Arcuri raised his price target on Micron to $475 and is forecasting next-year EPS of $85, well above the Wall Street consensus of $48. Stifel Nicolaus holds the highest Street target at $550.
Investor concerns also extend to increasing competition in high-bandwidth memory (HBM) and the longer-term risk of cyclical oversupply in the memory sector. However, supply growth faces real constraints, including limited clean-room space, long equipment lead times, and a shortage of qualified engineers.
