South Korean chipmakers plunge as U.S. AI data‑center regulation fears follow midterm election results

After Democrats swept the U.S. midterm elections, investors feared tighter AI data‑center rules and sold South Korean semiconductor stocks. Samsung Electronics fell about 7% and SK Hynix dropped roughly 9% in early trading, pulling the KOSPI down more than 5%. The sell‑off triggered a sell‑side circuit‑breaker and a record‑high net foreign outflow in the KOSPI market.

The sharp decline in Samsung and SK Hynix reduces the market value of South Korea’s two largest companies and depresses the KOSPI, affecting investors holding Korean equities or ETFs linked to the index. Foreign investors sold a record‑high 3.3928 trillion won of KOSPI stocks on the day, indicating a rapid shift in capital flows ().

  • 1The KOSPI opened at 5,580.09 points, down 103.71 points (1.82%) from the previous close ().
  • 2The KOSPI fell to 5,458.83 points as of 11 a.m., a 3.96% drop from the prior close ().
  • 3SK Hynix fell 7.45% intraday to 1.292 million won, breaking below the 1.3 million‑won level ().
  • 4Samsung Electronics dropped 5.96% to 205,000 won, approaching the 200,000‑won support line ().
  • 5Foreign investors net‑sold 3.3928 trillion won of KOSPI stocks during the session ().
  • 6Retail investors net‑bought 2.2722 trillion won and institutions net‑bought 845.7 billion won in the KOSPI market ().

Sources