The S&P 500 rose 10.4 points, or 0.16%, at the open to 6,381.23​, while the Nasdaq Composite rose 42.1 points, or 0.20%, to 21,140.397 at the opening bell.

U.S. stock indexes are drifting on Wednesday after the Federal Reserve decided to keep interest rates where they are.

The US Federal Reserve is expected to hold rates steady amid continued pressure from Donald Trump to lower borrowing costs. Trump had earlier announced plans to sack the Fed Chair but later abandoned any consideration of firing Jerome Powell.