US stocks today: S&P, Nasdaq soar 1% at open as easing oil prices boost Fed hike relief

US stocks opened higher on Thursday as falling oil prices improved investor sentiment following the Federal Reserve's first rate hike under Chair Kevin Warsh. The Dow rose 0.82%, the S&P 500 gained 1.05% and the Nasdaq climbed 1.54% at the open, extending gains across major indexes.