The Kospi experienced a remarkable milestone, closing at an unprecedented height of 9,063.84 on June 18, 2026 which reflects a substantial gain of 2.25% in just one trading session. Meanwhile, the Nikkei 225 also marked a significant moment by surpassing 66,000 points during intraday trading, highlighting a strong performance in Japan's market.
Through late May, the Kospi recorded over 100% in year-to-date gains. This remarkable performance was buoyed by major players such as Samsung Electronics, which increased by 4.62% on June 18, and SK Hynix, with a surge of 6.51%. Notably, these two companies comprise over half of the total market value of the Kospi.
In a noteworthy development, SK Hynix achieved a market capitalization of $1 trillion in late May. This positions it as only the third Asian company to reach this benchmark, following Samsung and TSMC. The rapid escalation of SK Hynix is largely influenced by the surging demand for high-bandwidth memory (HBM), essential for the functioning of AI servers that require significant quantities of these specialized chips for the operation of advanced language models.
Japan’s recent market growth has been powered by semiconductor equipment companies like Tokyo Electron, which produce the machinery necessary for chip fabrication. As chipmakers globally expand their output to satisfy increasing AI demands, Japanese firms are establishing a dominant presence in several critical sectors of this supply chain.
What do the export figures indicate?
South Korea’s export statistics for May 2026 reflected an impressive year-over-year increase of 53.2%, marking the fastest growth the nation has seen in over 40 years, primarily driven by robust sales in the semiconductor sector. This level of export growth parallels South Korea's early industrialization in the 1980s.
What implications does this hold for investors?
When two firms dominate more than half of an entire national index's market value, any disruptions in their earnings or market dynamics can reverberate across the whole index. Memory chip production is especially prone to cyclical fluctuations that can quickly reverse gains.
Additionally, the recent reclassification of tokenized stocks in South Korea as securities adds another dimension for investors to consider. Should regulators align the treatment of tokenized equities with traditional stocks, it may create new entry points for crypto investments into the semiconductor market.
If the capital expenditure budgets of hyperscalers stabilize or advancements in chip architectures reduce memory needs, the stocks that have driven these market indices to record heights could potentially experience a swift reversal. Currently, the insatiable demand for AI chips is fundamentally altering the economic landscape of South Korea and Japan, propelling their benchmark indices into previously inconceivable territory just one year prior.