Key Points:
- South Korea’s KOSPI index reached a historic milestone as average daily trading volume surpassed 48 trillion won ($26.4 billion) in May 2026.
- The stock market rally pushed the KOSPI past 7,000 points on May 6, briefly touching the 8,000 mark on May 15.
- Two tech-giant bellwethers, Samsung Electronics and SK hynix, accounted for 43% of the exchange’s daily trading volume.
- Market analysts attribute this hyper-concentration of capital to the ongoing global artificial intelligence (AI) investment boom.
South Korea’s main stock exchange has reached a massive financial milestone, with daily trading volume hitting a record high. According to official data from the Korea Exchange (KRX) released on Monday, May 25, 2026, average daily trading volume on the benchmark Korea Composite Stock Price Index (KOSPI) reached 48.05 trillion won (approximately US$26.4 billion) during the first 22 days of May. This marks the first time that monthly average daily turnover has ever crossed the 40 trillion-won threshold, easily beating the previous record of 32.23 trillion won set in February.
The historic trading frenzy directly mirrors the index’s explosive run to all-time highs throughout the month. The KOSPI surpassed the long-awaited 7,000-point milestone for the first time on May 6. Just nine days later, on May 15, intense buying momentum briefly pushed the index past the 8,000-point mark during volatile intraday trading. Although the market experienced subsequent profit-taking, the KOSPI closed at 7,847.71 last Friday, marking a stunning 19% gain compared to the end of April.
Heavy buying of South Korea’s flagship technology companies drove this massive trading surge. Semiconductor giants Samsung Electronics and SK hynix saw their combined daily trading value average 20.57 trillion won during the same period. This incredible volume accounted for roughly 43% of the entire KOSPI’s daily turnover, demonstrating how heavily institutional and retail investors are concentrating their capital on these two market bellwethers.
Industry analysts point to the ongoing global artificial intelligence (AI) boom as the primary driver behind this hyper-concentration of capital. Since the generative AI investment rally kicked off in 2023, investors have poured massive amounts of capital into companies that supply high-bandwidth memory (HBM) and next-generation semiconductors. South Korean firms hold a dominant position in these critical memory components, positioning them perfectly to benefit from global technology infrastructure buildouts.
Financial experts at domestic brokerages confirmed that growth prospects in the AI sector continue to overshadow broader macroeconomic worries. Kang Dae-seung, a market analyst at SK Securities, explained that investors are deliberately focusing their portfolios on AI-related industries because their long-term earnings potential remains incredibly robust. Even as rising interest rates and inflation concern other sectors, tech-heavy enterprises remain highly shielded from economic slowdowns.
This massive stock rally coincides with booming export data for South Korea’s technology sector. Shipments of high-tech memory chips have surged significantly throughout the first half of 2026, driven by intense demand from North American and European cloud data centers. In particular, custom HBM chips are commanding premium prices, enabling companies to increase their profit margins by over 20% compared to traditional commodity DRAM chips.
The retail investing public has also fueled this historic trading volume. Easy-to-use mobile trading applications have democratized access to the stock market, allowing millions of individual investors to buy shares of Samsung and SK hynix instantly. This retail enthusiasm has pumped billions of dollars of fresh liquidity into the local market, driving daily transaction counts to all-time highs and creating a highly self-reinforcing bullish cycle.
While the tech sector enjoys unprecedented success, some analysts urge caution regarding the market’s heavy reliance on just two main stocks. Having nearly half of the index’s trading volume concentrated in Samsung and SK hynix creates potential vulnerability if global tech demand experiences a sudden cyclical slowdown. However, for now, the dual engines of AI innovation and robust global chip demand continue to power the South Korean stock market into uncharted territory.
