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KOSPI Index Soars to Record Highs, As YTD Rally Approaches 50%

Asktraders News Team trader
Updated 2 Oct 2025

The KOSPI Index continues its bullish run, reaching new record highs fueled by gains in locally listed tech bluechips. The South Korean benchmark index touched an intraday peak of 3,565.96 before settling slightly lower at 3,549.21, a substantial 2.70% increase.

This surge is primarily attributed to the stellar performance of Korean blue-chip companies, notably Samsung Electronics and SK Hynix, both of which have capitalized on a strategic partnership with OpenAI.

SK Hynix led the charge, adding a remarkable 10.9% to its stock value, while Samsung Electronics followed closely with a gain of 4.36%. Both companies achieved new highs on the back of this transformative chip deal with OpenAI. The KOSPI's performance continues to outpace many of its global counterparts, boasting a year-to-date gain of 48.16%.

The catalyst for this market enthusiasm is OpenAI's decision to partner with Samsung Electronics and SK Hynix for the supply of memory chips needed for its ambitious $500 billion “Stargate” project. This initiative aims to solidify the United States' leadership in artificial intelligence through the development of extensive AI infrastructure.

The agreement was cemented during a meeting in Seoul involving OpenAI CEO Sam Altman, South Korean President Lee Jae Myung, and the chairmen of both chipmakers. Plans are underway to establish two AI data centers in South Korea, each with a 20-megawatt capacity, supporting Seoul's vision of becoming Asia's AI hub.

The market's response to this partnership was immediate and significant. Samsung Electronics' shares climbed by 4.7%, reaching levels not seen in four years, while SK Hynix's shares skyrocketed by 12%, achieving an all-time high.

Cumulatively, these gains added approximately $37 billion to the combined market capitalization of the two companies. This rally played a crucial role in propelling the KOSPI Index to its record peak, with a gain exceeding 3%.

This alliance is anticipated to significantly boost demand for high-bandwidth memory (HBM) chips, effectively alleviating previous concerns regarding potential price declines due to heightened competition. Analysts at KB Securities have suggested that worries about falling HBM prices in the coming year could be mitigated by this strategic collaboration, as the Stargate project is expected to generate substantial demand.

Furthermore, the collaboration between OpenAI and these South Korean tech powerhouses highlights the country's increasingly important role in the global AI supply chain. It also underscores the strengthening economic ties between South Korea and the United States, potentially paving the way for more favorable trade negotiations.

OpenAI's investment in Korean data centers reinforces Seoul's ambition to become a leading AI hub in Asia, further solidifying South Korea's position within the global technology arena.

The recent surge in the KOSPI Index and the impressive gains of Samsung Electronics and SK Hynix reflect the market’s confidence in the long-term prospects of the South Korean technology sector, particularly in the context of the burgeoning AI industry.

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