Groupon Inc. (NASDAQ:GRPN) is expected to report second-quarter earnings after the bell Wednesday for the fiscal quarter ending June 2013. According to Zacks Investment Research, based on 12 analysts' forecasts, the consensus EPS forecast for the quarter is a loss of 3 cents per share, compared with EPS of 4 cents for the same period a year ago.

For the fiscal first quarter 2013, the online daily deals service reported an EPS loss of 3 cents per share. Revenue increased 8 percent to $601.4 million, compared with $559.3 million in the first quarter 2012.

As of 1:17 p.m. Eastern, shares of Groupon fell 0.98 percent to $8.62 in afternoon trade.

After the bell Wednesday, investors also will watch quarterly results from Tesla Motors Inc. and Green Mountain Coffee Roasters Inc.

Tesla Motors Inc. (NASDAQ:TSLA) is forecast to report a loss of $18.8 million, or 17 cents per share, for the second quarter on $383 million in revenue, according to analysts polled by Reuters. 

Shares of Tesla Motors dropped 5.07 percent to $134.94.

Green Mountain Coffee Roasters Inc. (NASDAQ:GMCR) is expected to report fiscal 2013 third-quarter earnings of 73 cents per share on revenue of $981.90 million, compared with earnings of 46 cents per share on revenue of $869.19 million in the year-ago quarter.

Shares of Green Mountain Coffee Roasters fell 2.58 percent to $79.22.

Wednesday was another busy day for second-quarter earnings season as investors weighed a series of corporate reports from AOL Inc. (NYSE:AOL), Time Warner Inc. (NYSE:TWX) and Ralph Lauren Corp (NYSE:RL).

The Dow Jones Industrial Average dropped 47.93 points, or 0.31 percent, at 15,470.81. The S&P 500 Index was down 5.38 points, or 0.32 percent, at 1,691.83. The Nasdaq Composite Index was down 12.95 points, or 0.35 percent, at 3,653.14.