List of defense contractors
A defense contractor is a business organization or individual that provides products or services to a military or intelligence department of a government. Products typically include military or civilian aircraft, ships, vehicles, weaponry, and electronic systems, while services can include logistics, technical support and training, communications support, and engineering support in cooperation with the government.
Security contractors do not generally provide direct support of military operations. Under the 1949 Geneva Conventions, military contractors engaged in direct support of military operations may be legitimate targets of military attacks.
In the United States, defense contracting has taken an increasingly larger role. In 2009, the Department of Defense spent nearly $316 billion on contracts. Contractors have assumed a much larger on-the-ground presence during American conflicts: during the 1991 Gulf War the ratio of uniformed military to contractors was about 50 to 1, while during the first four years of the Iraq War the U.S. hired over 190,000 contractors, surpassing the total American military presence even during the 2007 Iraq surge and 23 times greater than other allied military personnel numbers. In Afghanistan, the presence of almost 100,000 contractors has resulted in a near 1-to-1 ratio with military personnel. The surge in spending on defense services contractors that began in 2001 came to a halt in 2009, leading to the Better Buying Power initiative of 2010.
List of defense contractors by arm sales
This is a list of the world's 50 largest arms manufacturers and other military service companies, along with their countries of origin. The information is based on a list published by the Stockholm International Peace Research Institute for 2018. The list provided by the SIPRI excludes companies based in China. The numbers are in billions of US dollars.| Rank | Company name | Defense Revenue | % of Total Revenue from Defense |
| 1 |  Lockheed Martin | 44.9 | 88% |
| 2 | Boeing | 26.9 | 29% |
| 3 | Raytheon Technologies | 23.8 | 94% |
| 4 |  BAE Systems | 22.9 | 98% |
| 5 | Northrop Grumman | 22.3 | 87% |
| 6 | General Dynamics | 19.4 | 63% |
| 7 | L3Harris Technologies | 11.9 | 76% |
| 8 |  Airbus | 11.2 | 15% |
| 9 |  Thales Group | 9.0 | 51% |
| 10 |  Leonardo | 8.8 | 68% |
| 11 |  Almaz-Antey | 8.5 | 94% |
| 12 | Huntington Ingalls | 6.8 | 74% |
| 13 | United Aircraft Corporation | 6.4 | 83% |
| 14 | United Shipbuilding Corporation | 4.9 | 89% |
| 15 | Honeywell | 4.6 | 11% |
| 16 | Rolls-Royce | 4.4 | 23% |
| 17 | Leidos | 4.3 | 43% |
| 18 | Naval Group | 4.1 | 99% |
| 19 | Textron | 4.1 | 29% |
| 20 | Booz Allen Hamilton | 4.0 | 70% |
| 21 | General Electric | 3.8 | 3% |
| 22 | Tactical Missiles Corporation | 3.5 | 99% |
| 23 |  Mitsubishi Heavy Industries | 3.5 | 10% |
| 24 |  Rheinmetall | 3.4 | 51% |
| 25 | MBDA | 3.3 | 97% |
| 26 | Babcock International Group | 3.2 | 47% |
| 27 |  Elbit Systems | 3.2 | 95% |
| 28 |  Russian Helicopters | 3.1 | 81% |
| 29 |  Bechtel | 3.1 | 12% |
| 30 | CACI International | 2.9 | 67% |
| 31 | Safran | 2.9 | 15% |
| 32 | High Precision Systems | 2.8 | 97% |
| 33 | Science Applications International Corporation | 2.7 | 62% |
| 34 |  Saab | 2.6 | 84% |
| 35 |  Indian Ordnance Factories | 2.6 | 96% |
| 36 | Hindustan Aeronautics | 2.6 | 94% |
| 37 | CSRA | 2.5 | 48% |
| 38 | United Engine Corporation | 2.5 | 64% |
| 39 | Israel Aerospace Industries | 2.4 | 70% |
| 40 | Orbital ATK | 2.3 | 50% |
| 41 | General Atomics | 2.2 | |
| 42 | Rafael | 2.2 | 98% |
| 43 | CEA | 2.1 | 39% |
| 44 | Russian Electronics | 2.1 | 57% |
| 45 |  Kawasaki Heavy Industries | 2.1 | 15% |
| 46 |  Hanwha Techwin | 2.1 | 57% |
| 47 | Dassault Aviation Groupe | 2.1 | 39% |