Stock Market Today: Welcome Back, 4%

This live blog is refreshed periodically throughout the day with the latest updates from the market. To find the latest Stock Market Today threads, click here. Happy Thursday. This is TheStreet's Stock Market Today for Sept. 18, 2025. You can follow the latest updates on the market here in our daily live blog. Update: 9:30 a.m. ET Opening Bell The U.S. equity markets are now open for the day. The Nasdaq (+0.90%) and S&P 500 (+0.71%) are strong out of the gate this morning, while the Russell 2000 (+0.18%) ...