Uncertainty over the debt negotiations in Greece weighed on U.S. stocks Monday after two-thirds of Greek citizens voted “no” on a proposal from the country’s creditors on a bailout deal, according to CNBC.
Energy shares in the S&P 500 percent fell nearly 1.5 percent and the Nasdaq’s biotechnology sector declined 0.7 percent, CNBC reported.
The Dow Jones Industrial Average declined 46.53 points to 17, 683.58, the S&P 500 composite index slipped 8.02 points to 2, 068.76 and the NASDAQ composite index fell 17.27 points to 4, 991.94.
Top Percentage Gainers
 Company |  $ Stock Price |  $ Change |  % Change |
  ICF International |   36.48 |   0.50 |   1.39% |
  Raytheon |   96.75 |   1.18 |   1.23% |
 Intelsat |   20.89 |   0.20 |   0.97% |
  Navistar International |   9.61 |   0.07 |   0.73% |
  Maximus |   66.21 |   0.45 |   0.68% |
Market Summary
 Advancing Issues |   15 (50.00%) |
 Declining Issues |   13 (43.33%) |
 Unchanged Issues |    2 (6.66%) |
Executive Mosaic‘s GovCon Index is a composite index that tracks 30 of the largest publicly-traded Government Contracting (GovCon) firms.