Of the 100 companies on the list, 44 are based in the US, including Boeing, Northrop Grumman and Lockheed Martin.
The American companies account for more than 60 percent of arms sales revenue of the 100 manufacturers.
Seven of SIPRI’s top 10 are American, one is British, one is Italian and one is a multinational EU conglomerate.
The US federal government has contract deals with all seven American companies. These seven are among the top 10 US federal contractors by amount procured, according to the government’s Federal Procurement Data System.