South Korea’s benchmark Kospi fell for a fourth consecutive session on Sept. 15, 2026, as rising oil prices, elevated U.S. Treasury yields and uncertainty ahead of the Federal Reserve’s rate-setting meeting prompted foreign and institutional selling. The index dropped 57.11 points, or 0.85%, to 6,627.26. Trading was light at 274 million shares worth 16.2 trillion won ($11.9 billion), with decliners outnumbering advancers 621 to 253. Retail investors bought a net 833.13 billion won, while foreign and institutional investors sold a combined net 2.48 trillion won. Brent crude rose about 1.6% to above $107 a barrel after the 10-year U.S. Treasury yield breached 5%. The won weakened 12.1 won to 1,359.4 per dollar as of 3:30 p.m. Samsung Electronics and SK hynix edged lower, while defense shares fell on profit-taking. Battery makers LG Energy Solution and Samsung SDI gained after U.S. President Donald Trump formally criticized Ford Motor Company over its partnership with Chinese automotive companies. Investors were also weighing calls from AI leaders to slow the pace of industry development.