South Korea’s benchmark Kospi index tumbled on Thursday, July 2, 2026, as chipmaking giants Samsung Electronics and SK Hynix saw shares plunge. The sell-off, driven by a broader tech downturn originating in the U.S. Nasdaq, triggered significant market losses as investors reassessed the massive capital expenditures currently fueling the global artificial intelligence sector.
Market Contagion and the Tech Sell-off
Asian markets experienced a sharp retreat on Thursday as the technology sector faced a wave of aggressive selling. In South Korea, the impact was particularly severe due to the outsized influence of the country’s two largest semiconductor manufacturers. Samsung Electronics shares fell more than 7% at the open, ultimately closing down 9.06% to 286,000, while SK Hynix shares dropped over 9% initially before finishing 14.57% lower at 2,187,000, according to CNBC.
The volatility highlights the concentration risk within the South Korean market. “Samsung and SK Hynix now make up around half the Kospi’s total weight, up from around just a quarter at the end of last year,” said Zavier Wong, a market analyst at eToro, via CNBC. He added that sharp moves in these two stocks effectively dictate the index’s direction before other listed companies can influence the outcome.
The decline was not limited to the Korean peninsula. Yahoo Finance reported that Japan’s Nikkei 225 shed roughly 1.5%, with chip-equipment manufacturer Tokyo Electron falling 5.6%. In Taiwan, the Taiex slipped 1.1% as TSMC gave up 1.8%. This regional downturn mirrored a rough session on Wall Street, where Micron Technology and Intel saw shares drop by 10% and 9%, respectively.
In broader financial context, the semiconductor industry is highly cyclical and capital-intensive. Manufacturers typically operate on long-term investment cycles, meaning they must commit billions of dollars to fabrication plants—or “fabs”—years before the facilities become operational. When market sentiment shifts rapidly, investors often look to these capital expenditure figures as a barometer for potential future oversupply, fearing that the current build-out of data centers may outpace the actual revenue-generating capacity of AI software applications.
For more on this story, see Samsung and SK Hynix Shares Tumble Amid Nasdaq Tech Slump.
The AI Supply-Demand Dilemma
The widespread investor retreat appears rooted in growing skepticism regarding the sustainability of current AI-related expenditures. While Big Tech firms have poured vast sums into data centers and advanced hardware, market sentiment has soured on the possibility that the market could become “awash with supply,” according to reporting from Yahoo Finance.
Analysts at Capital Economics noted that while demand for AI infrastructure remains, it may grow at a pace slower than many market participants previously anticipated. This caution has led to a re-evaluation of semiconductor stocks that had previously enjoyed a stellar year, with the Kospi and Nikkei still holding year-to-date gains of roughly 85% and 34%, respectively.
SK Hynix’s Long-Term Capital Commitments
Despite the immediate market turbulence, SK Hynix reaffirmed its long-term strategy during a public briefing in Asan, South Korea. Chief Executive Officer Kwak Noh-jung announced that the company plans to invest 100 trillion Korean won ($64.37 billion) into domestic manufacturing capacity.
“These investments are aimed at meeting the soaring demand for HBM servers and DRAM, as well as enterprise SSDs and NAND, as AI services take off,” Kwak Noh-jung, CEO of SK Hynix, via CNBC.
The expansion plan includes the construction of the M17 fabrication plant, with operations targeted for the first half of 2029. Of the 100 trillion won total, 80 trillion won is earmarked for the M17 plant to produce NAND flash memory, while 20 trillion won will support the P&T7 facility for advanced chip assembly. Additionally, the parent organization, SK Group, intends to build AI data centers nationwide, starting with an initial capacity of 5 gigawatts and scaling to 15 gigawatts over time. This infrastructure push is part of a national strategy to maintain South Korea’s competitive edge in the global semiconductor hierarchy, a sector that accounts for a significant portion of the nation’s total exports.
This follows our earlier report, Stock Futures Mixed Amid Iran-Israel Escalation.
Global Market Context and Upcoming U.S. Data
The semiconductor sell-off occurred as global markets braced for key U.S. employment figures. Economists polled by Dow Jones expect the U.S. to have added approximately 115,000 jobs in June. Investors are closely monitoring this data under the tenure of new Federal Reserve Chair Kevin Warsh, fearing that a robust jobs report could force the Federal Reserve to maintain higher interest rates for an extended period. Historically, high interest rates increase the cost of borrowing for capital-intensive firms, which can weigh heavily on the valuation of growth-oriented tech stocks.
Meanwhile, commodities markets showed signs of shifting sentiment. Brent crude oil prices eased by approximately 1% to $70.89 a barrel, while the U.S. benchmark, WTI, dropped 3% to roughly $69, as market hopes for recovering supply lines through the Strait of Hormuz tempered oil price volatility. The convergence of cooling energy prices and tech-sector volatility suggests that global investors are recalibrating their risk exposure across multiple asset classes as they await further signals on the health of the U.S. labor market.
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