The New York Stock Exchange was down on Wednesday due to a possible "configuration problem" with a software update, but trading still occurred at other venues.
Stocks turned lower today as the Feds statement said officials predicted their target interest rate would be 1 percent at the end of 2015 and 2.25 percent a year later, higher than previously forecast.
More than $41 billion has returned to U.S. exchange-traded funds that own shares in the past four weeks, reversing withdrawals that swelled to as much as $40.2 billion last month.
U.S. stocks erased losses, sending the Standard & Poors 500 Index above its record close, after companies from Macys Inc. to Home Depot Inc. reported higher- than-estimated earnings.
The S&P 500 slipped 0.1 percent to 1,818.35 at 10:18 a.m. in New York, after falling as much as 0.6 percent earlier. The Dow Jones Industrial Average lost 19.87 points, or 0.1 percent, to 15,944.07.
Stocks rose, sending the Standard & Poors 500 Index higher for a fourth day, as Federal Reserve Chairman Janet Yellen said more work is needed to restore the labor market.
Stocks were little changed as investors assessed prospects for economic and corporate earnings growth after the Standard & Poors 500 Index rallied the most last year in more than a decade.