KOSPI and Nasdaq 100 Link Strengthens, Posing Concerns for Investors

The increasing correlation between South Korea's Kospi index and the technology-heavy U.S. Nasdaq 100 index has emerged as a new concern for investors in global markets. According to data provided by Rayliant, the 60-day correlation between the two indices has risen to around 0.50, marking its highest level since 2021. This figure is roughly triple the five-year average of 0.16, highlighting how tightly linked global technology stocks, particularly those focused on artificial intelligence (AI), have become.

At the core of this convergence are South Korea's semiconductor giants, Samsung Electronics (005930.KS) and SK Hynix (000660.KS). These two companies play a critical role in the AI supply chain as primary suppliers of high-bandwidth memory (HBM) chips. As AI has become a dominant global investment theme, the performance of these Korean companies has started to function as a barometer, providing an early indication of the trajectory of AI and semiconductor stocks on Wall Street. Market experts even suggest that the South Korean market has effectively become part of the same volatility ecosystem as the Nasdaq and the Philadelphia Semiconductor Index (SOX).

This increased correlation implies a faster transmission of risks across global markets. Notably, during market downturns, the Nasdaq 100's sensitivity to movements in the Kospi has reached its highest level since 1990. For instance, when the Kospi experienced a nearly 9% drop amid concerns about AI demand, SK Hynix's U.S.-listed American Depositary Receipts (ADRs) also fell by 9.3%, dragging down other major semiconductor stocks. The South Korean market has become one of the most volatile major stock markets globally, driven by heavy retail investor participation, extensive use of leveraged trading, and a high concentration in AI-related technology companies.

This situation also aligns with broader trends in the global technology sector. The boom in AI investments has propelled information technology investment as a share of U.S. economic output to its highest level since 2001, generating positive spillovers, particularly for Asia's technology exports. However, rising risks include the concentration of this tech investment and the negative effects of trade disruptions. The dominant position of U.S. technology companies in global markets and their reliance on AI infrastructure spending directly impact the markets of semiconductor-supplying nations like South Korea.

Analysts advise investors to remain cautious regarding potential slowdowns in AI demand and intensifying competition from China. Recently, factors such as financing risks tied to AI infrastructure spending and China's efforts to develop its own semiconductor technologies have led to declines in South Korean chip stocks. These developments raise doubts about the sustainability of the AI investment cycle and suggest that markets are undergoing a 'reset' of AI expectations. Moving forward, the trajectory of global AI spending will play a crucial role in determining the direction of this strong correlation between Korean and U.S. technology stocks.