Vistra Corp. (VST) Stock Drops at the Close, Then Rebounds After Hours on PJM Auction News — What to Know Before the Market Opens Dec. 18, 2025
Vistra Corp. (NYSE: VST) ended Wednesday, December 17, 2025, with a sharp regular-session selloff — then clawed back some ground in after-hours trading as investors digested a major catalyst tied to U.S. grid capacity pricing. By the closing bell, VST finished at $159.97, down 7.77%, after trading in a wide range that saw the stock touch $175.14 intraday and as low as $158.71, with about 6.58 million shares changing hands. Investing.com But after the bell, sentiment improved. In extended trading, VST was quoted around $163.21 (+2.03%) as of 7:58 p.m. ET, reflecting a rebound that followed late-day headlines from the