SK Hynix stock falls, leads broader chip sector declines as AI trade angst returns

What happened: Chip stocks retreated on Monday as US-listed shares of South Korean memory maker SK Hynix (SKHY) declined 6%. What's behind the move: Investors took profits amid concerns of an increasingly overstretched and crowded trade. SK Hynix stock sank 15% in Asia, setting the stage for a volatile session in US-traded shares after their stellar debut on Friday. Worries over a South Korean brokerage report indicating that SK Hynix's operating profit for the current quarter may miss estimates also weighed on sentiment. Rival Samsung Electronics (005930.KS) stock fell in South Korea. In the US, AI memory stocks Micron (MU), Sandisk (SNDK), and Western Digital (WDC) all sank roughly 5% on Monday morning. Chip stocks Intel (INTC), AMD (AMD), Broadcom (AVGO), and Arm Holdings (ARM) also declined roughly 2% with the broader sector. What else you need to know: The decline in the semiconductor space comes after SK Hynix's US debut on Friday, in which its American depositary shares surged almost 13% above the $149 offering. The company raised $26.5 billion in the offering, making it the largest US IPO ever by a foreign company. Chip stocks have been volatile in recent months, with the sector peaking in late June amid concerns that hyperscale cloud providers may need to take on more debt to fund soaring AI infrastructure spending. Any signs of a slowdown in AI investment could trigger a broader sell-off in memory stocks. Semiconductor stocks have been a key driver of earnings growth this year, helping lift the broader stock market as AI inference workloads require vast amounts of memory and other components to process increasingly complex queries and power AI agents. Ines Ferre is a Senior Business Reporter for Yahoo Finance covering the US stock market, publicly traded companies, and commodities. Click here for in-depth analysis of the latest stock market news and events moving stock prices