South Korea's stock market experienced a dramatic 6% crash on Friday after reaching unprecedented valuation levels, with the benchmark Kospi briefly crossing 8,000 for the first time in history before plunging sharply. The selloff exposed how heavily the market had become dependent on a handful of AI chip companies, with Samsung Electronics falling nearly 9% and SK Hynix dropping 8% during the session. According to Bloomberg, the market had nearly tripled from around 2,600 levels a year ago, making it one of the world's best-performing major equity markets. The crash came after Chinese semiconductor stocks had already reached extreme overbought territory, with Barchart declaring they were the most overbought since the dot-com bubble peak. The Philadelphia Semiconductor Index ($SOX) is trading at a price-to-sales ratio of approximately 9, representing more than 4 times the level seen in 2013.
The semiconductor rally had attracted unprecedented institutional interest, with the Direxion Daily Semiconductor Bull 3X Shares (SOXL) attracting a record inflow of more than $1.03 billion on Tuesday, according to The Kobeissi Letter. The SOXL had surged more than 342% this year alone, while TQQQ had gained 50%. However, the bearish Direxion Daily Semiconductor Bear 3X Shares (SOXS) posted $230 million in outflows, the largest daily outflow since late March. Inflows into SOXL are now 6 times larger than inflows into ProShares UltraPro QQQ (TQQQ), indicating just how concentrated bullish bets in semiconductors had become. The crash was particularly severe as foreign investors sold 5.6 trillion won worth of Korean shares during Friday's session, extending total outflows for the week to 14.3 trillion won. The scale of volatility became so intense that the Korea Exchange temporarily halted program selling after futures slumped more than 5%.
The semiconductor rally had been fueled by exploding demand for AI infrastructure as global technology companies race to build AI models and expand computing capacity. This triggered a massive surge in orders for high-bandwidth memory chips, leading investors to aggressively buy Korean semiconductor stocks. Samsung shares had rallied nearly 190% over the past six months, while SK Hynix surged more than 220% during the same period. Together, the two companies accounted for nearly half of the Kospi index weighting and contributed roughly two-thirds of the benchmark's gains this year. However, the rally had become increasingly speculative, with retail investors increasingly borrowing money to amplify bets on semiconductor and AI-linked shares, while leveraged exchange-traded funds tracking Samsung and SK Hynix had become extremely popular. Analysts noted that the pullback was less about collapsing earnings and more about an overheated market running out of momentum after an extremely rapid rally.
The market crash was compounded by Samsung's ongoing labor dispute, with the company's labor union indicating that negotiations with management may resume only after June 7, raising fears that a prolonged strike could disrupt semiconductor production. This labor issue became an additional trigger for investors already looking to reduce exposure after the massive run-up in chip stocks. Global factors also contributed to the weakness, with rising oil prices, geopolitical uncertainty in West Asia and a lack of meaningful outcomes from the latest US-China summit weakening broader risk appetite across Asian markets. Higher global bond yields also pressured technology shares worldwide. The market has become one of the world's most volatile major indices in recent months, with daily swings of more than 5% becoming increasingly common. Despite the correction, many analysts still believe the long-term AI-driven semiconductor story remains intact, with South Korea having aggressively positioned itself as a global AI manufacturing hub.
