 "Wall Street inches up as Yellen speech awaited")
US stocks opened nearly marginally higher on Monday, with investors cautious ahead of Federal Reserve Chair Janet Yellen's speech on monetary policy at 12:30 p.m. ET.
The Dow Jones industrial average was up 28.08 points, or 0.16 percent, at 17,835.14.
The S&P 500 was up 3.4 points, or 0.16%, at 2,102.53.
The Nasdaq Composite was up 7.52 points, or 0.15%, at 4,950.04.