[Korea Market Close] KOSPI Closes at 6,838; Intraday Rally of +94 Points Erased as Long-Dated U.S. Yields Surge
KOSPI ended today at 6,838.04, down 32.77 points, or -0.48% , from the prior session. On the surface, it looks like a routine pullback. But the intraday picture was entirely different. Shortly after the open, the index rallied to 6,965.64—a gain of 94.83 points, or +1.38% from yesterday's close. In less than half a trading day, that 127-point swing vanished. The market pivoted twice in one session. KOSPI intraday path, Sept. 30. Source: aggregated from Infostock market data The culprit wasn't in Seoul Domestic news can't explain the reversal. The real pressure came from across the Pacific. Overnight, U.S. 30-year Treasury yields climbed to 5.621%, the highest level since June 2002—nearly 24 years ago. The 10-year yield also reached 5.294%, the highest since June 2007. The cause is straightforward: U.S. government spending isn't declining, and companies building AI infrastructure continue heavy borrowing. More bonds are being issued than purchased, so pric...