U.S. stock indexes slipped Wednesday after the Federal Reserve opted not to cut interest rates for the first time since it began trying to help the economy through easier rates in September. The S&P 500 fell 0.

Rebounding tech stocks drove U.S. indexes higher Tuesday, a day after they tumbled on doubts about whether the artificial-intelligence frenzy really needs all the dollars being poured

After plunging 17% on Monday, Nvidia climbed almost 9% as investors rushed in to buy this historic dip in shares of the top chip maker.

Nvidia shares' 9% recovery Tuesday was the second-best day in terms of market cap added for any company ever, trailing only a record it set in July.