Declines in raw material and railroad stocks held down U.S. markets Wednesday and investors grew concerned that Greece’s debt negotiations are not as close to completion as they previously anticipated, according to Bloomberg.
The Dow Jones Industrial Average sank 178 points to 17, 966.07, the S&P 500 composite index declined 15.62 points to 2, 108.58 and the NASDAQ composite index fell 37.68 points to 5, 122.41.
Top Percentage Gainers
 Company |  $ Stock Price |  $ Change |  % Change |
 Serco Group |   1.945 |   0.015 |   0.777% |
 BAE Systems |   29.98 |   0.17 |   0.57% |
  Rockwell Collins |   95.63 |   0.12 |   0.13% |
 General Dynamics |   145.52 |   0.15 |   0.10% |
Market Summary
 Advancing Issues |    4 (13.33%) |
 Declining Issues |  26 (86.66%) |
 Unchanged Issues |    0 |
Executive Mosaic‘s GovCon Index is a composite index that tracks 30 of the largest publicly-traded Government Contracting (GovCon) firms.