South Korean stocks suffered one of their sharpest declines in years on July 28, with the benchmark Kospi briefly breaching the psychologically important 6,000 level, as a wave of panic-selling hit semiconductor heavyweight shares over growing concerns that China’s expanding memory-chip industry could challenge the long-standing dominance of global suppliers.
The benchmark Kospi closed 10.84% lower at 6,023.66, after tumbling to an intraday low of 5,992.91. The steep selloff triggered a mandatory 20-minute marketwide circuit breaker on both the Kospi and the tech-heavy Kosdaq exchanges, temporarily suspending all equity trading as investors rushed for the exits.
The decline was led by South Korea’s twin semiconductor titans, which form the bedrock of the country’s export-driven economy. Samsung Electronics Co. fell 13.39%, while its smaller rival, SK Hynix Inc., plummeted 14.65%. The broader tech ecosystem felt the shockwaves as well, with Samsung Electronics Preferred Shares down 12.01% and SK Square Co., the investment arm of SK Group, falling 15.60%.
Market participants pointed to compounding headwinds out of China as the primary catalyst for the rout. In particular, impending plans for an initial public offering by Chinese memory-chip maker ChangXin Memory Technologies (CXMT) stoked fears of a massive capacity expansion that could disrupt the global DRAM market—a lucrative sector tightly controlled by a triumvirate of Samsung, SK Hynix, and U.S.-based Micron Technology Inc.
The prospect of a surge in cheap memory supply has raised alarms that DRAM prices could face prolonged weakness. Investor sentiment deteriorated further following reports that Yangtze Memory Technologies Co. (YMTC), China’s top flash-memory maker, is also preparing for a public listing, alongside signs that Chinese firms have accelerated breakthroughs in developing domestic deep ultraviolet (DUV) lithography equipment to bypass Western trade restrictions.
Together, the developments fueled expectations that Beijing’s semiconductor industry is rapidly achieving self-reliance, threatening to turn a once-reliable tech cycle into an aggressive price war in global markets.
The broad market capitulation prompted starkly mixed reactions among South Korea’s influential retail trading army. On popular online investment forums, posts reflected escalating anxiety, with some investors lamenting steep portfolio losses and expressing dread that the market had yet to find a definitive bottom. Conversely, a faction of retail dip-buyers viewed the historic single-day drops in Samsung and SK Hynix as a rare buying opportunity, betting on a sharp, short-term technical rebound.
Traders are now closely watching whether key technical support levels can stem the bleeding. Analysts have identified split-adjusted benchmarks of $450 for Samsung Electronics and $3,750 for SK Hynix as critical baselines for restoring investor confidence.
“The market right now is being driven almost entirely by macro anxiety and fear rather than corporate fundamentals,” said a financial industry official in Seoul. “A sustained stabilization will likely depend on whether institutional and foreign investors step in to buy at these levels, which would signal to the broader market that a bottom has finally formed.”
