U.S. and South Korean stocks rebounded after the Federal Reserve raised its benchmark interest rate by 25 basis points, its first increase since 2023, while falling oil prices and easing Treasury yields reduced inflation concerns. The S&P 500 rose 1.14% and the Nasdaq gained 1.69% overnight, while South Korea’s Kospi opened 2.24% higher at 6,865.94 on Sept. 18, 2026. Brent crude was reported near $102 to $104 a barrel, the 10-year Treasury yield hovered near 4.96% after falling 5 basis points, and technology shares led gains in both markets. Bitcoin rose roughly 1% above $76,000 and gold held above $4,400.