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By Heekyong Yang
SEOUL, July 28 (Reuters) - South Korean chip stocks slumped on Tuesday, with Samsung Electronics and SK Hynix falling as much as 9.5% and 11.1%, respectively, as investors retreated from AI-related stocks amid mounting concerns over financing risks tied to AI infrastructure spending and intensifying competition from China.
More from Yahoo Scout Why are investors worried about memory chip competition? What caused South Korean chip stocks to plummet? What concerns surround AI infrastructure financing and spending? How is China's technological progress affecting semiconductor markets?
SK Hynix's U.S.-listed shares had already slumped overnight, closing at $143.02, below their $149 initial public offering price.
The benchmark KOSPI was trading down around 8% as of 0120 GMT.
The sector-wide selloff followed a series of developments that renewed doubts about the sustainability of the AI-driven semiconductor rally.
SK Hynix, a key supplier of high-bandwidth memory (HBM) chips to Nvidia, has been one of the biggest beneficiaries of the AI spending boom, making its shares particularly sensitive to shifts in investor sentiment toward the sector.
Analysts said the selloff reflected a combination of concerns over AI infrastructure financing, China's technological advances and rising competition from Chinese firms.
Han Ji-young, an analyst at Kiwoom Securities, said reports that Chinese companies were developing domestic deep ultraviolet (DUV) lithography equipment had reignited concerns that Chinese memory makers could accelerate capacity expansion, intensifying competition in the global memory market.
While details such as the companies involved, equipment performance and commercialization timelines had yet to be disclosed, the news had cooled investor sentiment as the investment narrative for semiconductor stocks had already weakened, he said.
Han added that investors were also becoming increasingly cautious ahead of a string of earnings reports due later this week.
"Despite stronger-than-expected earnings from Samsung Electronics earlier this month and Alphabet last week, semiconductor shares experienced sharp declines after the results," he said.
Separately, a Wall Street Journal report that Nvidia could provide a roughly $250 billion financial backstop for an OpenAI data-centre project sent Nvidia shares down nearly 5%, with investors questioning the extent to which the AI chip leader may be financing its own customers.
Further weighing on sentiment, the growing popularity of low-cost Chinese open-source AI models such as Kimi K3 raised questions about whether future AI workloads could prove less intensive than previously expected — meaning less demand for advanced AI chips and HBM.
Meanwhile, Chinese memory-chip maker CXMT's strong stock-market debut fuelled concerns about intensifying competition in the global memory industry.
