Tuesday marked the Index’s first day of tracking new members Orbital ATK (NYSE: OA), the company formed out of the merger of ATKâs aerospace and defense groups with Orbital Sciences, and shipbuilder Huntington Ingalls (NYSE: HII).
The Dow Jones Industrial Average rose 139.55 points to 17, 868.76, the S&P 500 composite index gained 21.85 points to 2, 068.59 and the NASDAQ composite index climbed 61.63 points to 2, 787.65.
Top Percentage Gainers
 Company |  Stock Price |  $ Change |  % Change |
  Healthnet |   56.01 |   1.21 |   2.21% |
  BAE Systems Inc. |   31.89 |   0.68 |   2.18% |
  CGI Group |   42.24 |   0.86 |   2.08% |
  McKesson |   222.45 |   4.19 |   1.92% |
 SAIC |   51.38 |   0.74 |   1.46% |
Market Summary
 Advancing Issues |  23 (76.66%) |
 Declining Issues |   7 (24.33%) |
 Unchanged Issues |   0 |
Executive Mosaic‘s GovCon Index is a composite index that tracks 30 of the largest publicly-traded Government Contracting (GovCon) firms.