Samsung Electronics and SK Hynix shares extended their steep declines on Tuesday as growing competition from Chinese semiconductor manufacturers unsettled investors. Concerns about the sustainability of the artificial intelligence investment boom also weighed heavily on South Korean technology stocks.
Samsung Electronics shares tumbled 7.5%, while SK Hynix plunged 8.4% as of 02:36 GMT. Both semiconductor giants were heading toward their fifth consecutive trading session of losses.
The downturn followed a broader selloff in US semiconductor stocks, with negative market sentiment spreading across Asian technology markets.
Samsung and SK Hynix Face Growing Competition From China
The latest semiconductor stock selloff followed reports of technological advances by Chinese memory chip manufacturer ChangXin Memory Technologies (CXMT).
The company has reportedly made progress developing a next-generation DRAM architecture known as 4F², which could improve memory density and increase production efficiency.
CXMT is also aiming to introduce server-focused DDR5 memory products using the new technology before the end of 2026.
These developments have intensified concerns that Chinese semiconductor manufacturers could challenge established industry leaders, including Samsung Electronics and SK Hynix.
Greater competition could eventually increase memory chip supplies and create downward pressure on prices, potentially affecting profit margins across the industry.
US Semiconductor Stocks Slide Amid AI Market Concerns
Weakness in South Korean semiconductor shares followed losses among major US memory chip manufacturers.
Micron Technology declined 4% during Monday’s trading session, while SanDisk shares dropped 6%.
The declines reflected growing investor concerns about China’s technological progress and its potential impact on the global memory chip market.
Meanwhile, uncertainty surrounding artificial intelligence investment has added another layer of pressure.
Semiconductor stocks have benefited significantly from surging demand for advanced memory chips used in AI infrastructure and data centers.
However, after substantial gains in AI-related stocks, investors are increasingly questioning whether future earnings growth can justify elevated market valuations.
South Korea’s KOSPI Plunges as Foreign Investors Sell
The sharp declines in semiconductor stocks dragged South Korea’s broader equity market lower.
The benchmark KOSPI index plunged nearly 7% to 5,944.31 points, reflecting significant selling pressure across the technology sector.
Foreign investors were major sellers during the session, recording net equity sales of approximately 2.335 trillion won, equivalent to $1.6 billion.
In contrast, domestic retail investors took advantage of falling share prices, purchasing a net 1.311 trillion won worth of stocks.
The contrasting trading activity highlighted the divide between international investors reducing their exposure and local investors seeking opportunities following the market downturn.
AI Chip Valuations Face a Critical Test
The latest decline in Samsung and SK Hynix shares highlights mounting uncertainty surrounding the global semiconductor industry’s outlook.
Strong demand for AI-related memory chips has supported substantial stock market gains. Nevertheless, China’s accelerating technological development could reshape competition and challenge existing pricing expectations.
At the same time, elevated valuations have left semiconductor companies vulnerable to changes in investor sentiment.
Investors will likely continue monitoring CXMT’s technological progress, global AI infrastructure spending, and memory chip pricing trends for indications of whether the current semiconductor selloff could stabilize.
