South Korea Kospi Hits Record 8,000, Taiwan AI Surge: APAC Concentration Mirrors US Mega-Cap Risk

South Korea's Kospi benchmark equity index reached a historic 8,000 milestone on May 15, just seven trading sessions after crossing 7,000, capturing the euphoria of the AI infrastructure boom spreading to Asia-Pacific. This record rally, however, is showing signs of overheating and foreign investor caution. Bloomberg reported that Korean stocks tumbled as global funds reduced positions in the world's hottest market, a classic late-cycle pattern where retail/momentumThe empirical fact that winners keep winning over the medium term. chases rallies into foreign selling.

Taiwan equity markets are experiencing parallel momentumThe empirical fact that winners keep winning over the medium term., with JPMorgan raising its bull-case price target to 50,000 on the Taiex index (from prior levels), calling Taiwan 'the most pure-play exposure to the global AI buildout.' TSMC and peer foundries are benefiting from the surge in AI chip demand, yet the rally is creating concentration risk. Taiwan's market breadth is narrowing (similar to US mega-cap dominance); if semiconductor spending moderates or geopolitical risks (China, Taiwan tension during Trump-Xi meetings) escalate, the rally inverts sharply.

The broader APAC narrative mirrors the US concentration risk exposed in earlier months: a tiny cohort of high-beta tech and semiconductor names are driving index returns, while broader market participation (retail, mid-cap, value stocks) lags. Robotics has become a hot sub-theme in Asia (per Bloomberg's 'Physical AI Boom' coverage), with industrial robot makers surging as enterprises deploy autonomous systems for manufacturing. This broadening into robotics suggests some diffusion of AI gains beyond pure-play semiconductors, a potential positive for sustained breadth.

Risks are asymmetric and tilted to the downside. Foreign investors' tactical exit suggests institutions are taking profits at historic highs. If Korean or Taiwan equities correct 10-15%, margin calls on leveraged retail positions could trigger cascading selling. Geopolitical risk around the US-China summit's Taiwan dimension remains elevated; any hardening of US policy on Taiwan independence could re-shock these markets.