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KOSPI Closes at Record 9,063.84 as Samsung Electronics, SK Hynix Rally to Fresh Highs
South Korea's benchmark KOSPI ended June 18 at an all-time high of 9,063.84, marking the index's first-ever close above 9,000. The KOSPI rose 2.25% on the session, with gains heavily concentrated in two names.
Samsung Electronics and SK Hynix—together representing more than 50% of the index by market capitalization—both hit record highs and drove most of the advance, while the broader market weakened.
SK Hynix extended its rally after confirming it had shipped samples of its seventh-generation high-bandwidth memory chip, HBM4E, to major AI customers. The company is widely seen as the leading supplier of the specialized DRAM used in Nvidia GPU packages and large-scale AI workloads.
Samsung Electronics also jumped, lifting related stocks whose valuations are closely tied to their stakes in the chipmakers. Samsung Life Insurance and SK Square posted similar gains on that basis.
Away from the chip-linked cluster, declines dominated. Of 917 stocks traded on the Korea Exchange, 791 fell. Hyundai Motor slid 2.75%, Kia Corp dropped 4.51%, and LG Energy Solution lost 3.85%.
Foreign investors provided a major tailwind, buying a net 1.3 trillion won (about $851 million) worth of shares as flows concentrated on companies with the clearest AI earnings narrative.
After the close, Daishin Securities raised its 2026 KOSPI target to 11,500 from 8,800. Analyst Lee Kyungmin said upside momentum should persist as long as forward earnings estimates for chipmakers keep rising, describing the environment as a classic "performance and policy" market.
South Korea's financial regulator separately warned investors about single-stock leveraged products tied to Samsung Electronics and SK Hynix, signaling that retail leverage has risen sharply alongside the index.
The KOSPI cleared 9,000 just 16 trading days after first breaking above 8,000. Investors are now watching whether the next leg higher broadens beyond a handful of heavyweight chip names.