The Korea Composite Stock Price Index (Kospi) reached a new all-time high on Friday, June 19, 2026, as semiconductor giants Samsung Electronics and SK Hynix surged to record valuations, driving gains across Asia’s markets. Samsung’s shares climbed 3.1% to ₩89,500 ($68.20), while SK Hynix advanced 2.8% to ₩132,000 ($100.50), both marking their highest closing prices since the index’s 1983 launch. Analysts cite strong demand for AI chips and a weakening won as key drivers, though regional markets showed mixed performance.
Semiconductor Leaders Drive Record Valuations Amid AI Chip Demand
Samsung’s gains followed its ₩100 trillion ($76 billion) capital expenditure plan announced last month, which analysts say will bolster its lead in AI-driven memory and foundry chips. The company’s Foundry Business segment, which includes its advanced 3nm process technology, saw a 15% quarter-over-quarter revenue increase in Q1 2026, according to its May 30 investor presentation. SK Hynix, meanwhile, reported record quarterly earnings of ₩12.3 trillion ($9.4 billion) for Q1 2026, outpacing expectations amid a global shortage of high-end DRAM. The company’s AI-optimized HBM (High Bandwidth Memory) chips, used in data centers, saw demand surge 40% year-over-year, according to its earnings release.
"The semiconductor sector is the clear standout, with Samsung and SK Hynix acting as magnets for capital flows," said Lee Ji-hoon, chief strategist at KB Securities. "Investors are betting on AI infrastructure demand, and these two firms are the most direct beneficiaries. Their dominance in foundry and memory is unmatched globally. Even TSMC, their closest competitor, has struggled to match their AI chip production scale."
Samsung’s stock performance was further bolstered by its June 15 announcement of a partnership with NVIDIA to co-develop next-generation AI accelerators, a move that sent its shares up 2.3% in pre-market trading on June 18. The collaboration focuses on custom silicon solutions for large language models (LLMs), a sector where Samsung’s Exynos AI processors have gained traction in enterprise applications.
Supply Chain Pressures and Earnings Resilience at SK Hynix
SK Hynix’s earnings beat was particularly notable given its ongoing supply chain challenges. In its earnings call, CEO Kim Jin-hee acknowledged delays in securing key materials like tungsten and cobalt, which have constrained production of its 1α-nm DRAM chips. However, the company maintained its 2026 revenue guidance of ₩22 trillion ($16.8 billion), citing strong pricing power in the AI server market.
Both companies’ stock performance outpaced broader Asian indices, with the Nikkei 225 down 0.4% and the Shanghai Composite flat. The MSCI Asia Pacific Index rose 0.8%, led by South Korea’s tech sector, which now accounts for 38% of the Kospi’s total market capitalization, up from 28% in 2020, according to MSCI data.
Government-Led Expansion and Regulatory Risks in South Korea’s Semiconductor Sector
The Kospi’s surge reflects broader trends in South Korea’s economy, where the semiconductor industry has become a cornerstone of growth. The sector now contributes 16% of the country’s total exports, up from 10% in 2015, according to the Korea International Trade Association (KITA). The government’s 2026 Semiconductor Master Plan, unveiled in March, aims to double domestic chip production capacity by 2030, with a focus on AI and quantum computing.
Key to this expansion is the Pohang Semiconductor Complex, where Samsung and SK Hynix operate their largest fabrication plants. The complex, which employs over 12,000 workers, has seen ₩5 trillion ($3.8 billion) in infrastructure upgrades since 2023 to accommodate advanced node production. The government has also subsidized R&D costs for domestic firms, reducing their reliance on foreign technology licenses.
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However, the sector’s dominance has not been without challenges. In May 2026, the Korea Fair Trade Commission (KFTC) launched an antitrust investigation into Samsung and SK Hynix’s supply chain practices, particularly regarding exclusive contracts with equipment suppliers. The probe follows a 2025 ruling where the KFTC fined Samsung ₩1.2 trillion ($915 million) for abusing its market dominance in smartphone displays. Analysts warn that any further regulatory scrutiny could disrupt supply chains and increase costs, though neither company has indicated plans to alter their business models.
Currency Fluctuations and Sector-Specific Fallout in South Korea’s Economy
The South Korean won’s weakening to 1,310 per USD (from 1,280 at the start of June) has played a critical role in boosting export-driven earnings. The Bank of Korea (BOK) has refrained from intervention despite the depreciation, citing stable inflation and strong external demand. In its June 14 monetary policy statement, the BOK noted that the won’s movement was "largely reflective of market sentiment toward South Korea’s tech sector" and did not signal a shift in its neutral monetary stance.
However, the won’s decline has raised concerns among import-dependent industries, particularly automakers like Hyundai Motor Group, which saw its shares dip 1.5% on June 19 due to higher raw material costs. The Korea Automobile Manufacturers Association (KAMA) issued a statement urging the government to "monitor exchange rate volatility closely to prevent supply chain disruptions".
Geopolitical risks remain a wild card. The
