U.S. stocks overcame early-session volatility to finish higher on the 25th, capping a volatile week. The Dow Jones Industrial Average rose 479 points, or 0.9%, to 51,829, while the S&P 500 and Nasdaq Composite each gained about 0.5%. Retreating oil prices and progress in U.S.-Iran discussions supported sentiment, even as Treasury yields surged and markets reassessed Federal Reserve policy.