Lockheed Martin was the largest single contractor for the U.S. government in 2015, easily lapping the rest of the field with $36.2 billion. The next closest competitor was Boeing at $16.6 billion.The federal government’s top 100 as a whole obligated $238.5 billion in 2015, meaning the DoD represented about 73.5 percent of those contracts awarded to the biggest firms.
General Dynamics ($13.6 billion), Raytheon ($13.1 billion) and Northrop Grumman ($10.6 billion) rounded out the top five contractors. Health care services firm McKesson, which has a series of major contracts with the Tricare system, was the only non-defense contractor to make it into the top eight overall federal contractors.
See details on the top 100 federal contractors here: Top_100_Contractors_Report_Fiscal_Year_2015