KOSPI's wild ride underscores chip stock dependence

South Korea's stock market, the KOSPI, has endured a dramatic rollercoaster ride, nosediving below 8,000 points just two weeks after achieving a historic milestone above 9,000. The index closed at 7,648.09 on Thursday, marking a sharp 7.89% drop from the previous day. This steep decline occurred a mere 10 trading days after the KOSPI first breached the 9,000 mark on June 18.

The market's extreme sensitivity is primarily linked to its heavy concentration of large-cap semiconductor stocks, particularly Samsung Electronics and SK Hynix. These companies, along with related affiliates, constitute approximately 60% of the total market capitalization. Consequently, any shifts in the outlook for the artificial intelligence industry, a key driver for these chipmakers, directly impact the broader KOSPI index.

This volatility has triggered the market's circuit breaker mechanism multiple times. In the past month alone, trading was halted three times due to plunges exceeding 8%. The KOSPI 200 Futures index also experienced a 5% drop, activating the Korea Exchange's sell-side sidecar mechanism, which halts program sell orders. This year, the sidecar mechanism has been activated 30 times, surpassing its usage during the 2008 global financial crisis and underscoring the extreme market instability.

Despite the sharp downturn, the KOSPI showed signs of recovery, ending Friday's trading at 8,088.34, up 5.76%. The index had opened higher but slid intraday before reclaiming the 8,000 level. The market's performance continues to be closely watched, with analysts pointing to the significant influence of semiconductor stocks and the broader AI industry's trajectory.