The U.S. stock market opened little changed on Wednesday as investors remained on sidelines ahead of the policy announcement from the FOMC meeting and a news conference by Federal Reserve Chairwoman Janet Yellen. The Fed is expected to continue tapering the bond-buying program at a pace of $10 billion a month, though there might be changes to the way it targets unemployment and inflation. The S&P 500 opened less than a point lower at 1,871.49. The Dow Jones Industrial Average was off 8 points to 16,326.88. The Nasdaq Composite was 2 points lower at 4,330.86