ESM6 March 17, 2016. Daily chart.
ES had a minor pullback in the early sessions and resumed its rally 30 minutes after the market open. It had a second strong gain day, closing above the 200-day moving average line.
Today is quadruple witching expiration day. The March future contract will expire at the open. After the open, we should expect the price movement to be a little wild with a strong move in one direction or the other.