According to Marketwatch, SK Hynix plummeted 15% in Seoul trading on Monday, July 13, marking its worst single day in 18 years, while its U.S.-listed ADR (SKHY-US) tumbled 9%. The decline triggered a broader selloff in semiconductor stocks globally, with the Philadelphia Semiconductor Index (SOX-US) falling nearly 5%.
Analysts attributed the sharp decline to revised expectations for SK Hynix's second-quarter earnings and heightened Middle East geopolitical tensions, with market volatility amplified by active retail trading in South Korea.