There are five major companies that build large, commercial, Geosynchronous satellite platforms: A geosynchronous orbit is a geocentric orbit that has the same orbital period as the sidereal rotation period of the Earth. ...

• Alcatel Alenia Space (Europe/U.S.)
• Boeing (U.S.)
• Astrium Satellites, a Business Unit of EADS Astrium (Europe)
• Lockheed Martin (U.S.)
• Space Systems/Loral (U.S.)

In addition to those above, the following companies have successfully built and launched satellite platforms: Alcatel Alenia Space was established on July 1 2005 by the merger of Alcatel Space and Alenia Spazio and is owned by Alcatel (67%) and Finmeccanica (33%). The company is Europes largest satellite manufacturer. ... The Boeing Company (NYSE: BA, TYO: 7661 ) is an aerospace and defense corporation headquartered in Chicago, Illinois. ... Astrium Satellites, one of the three business units of Astrium, this company being a subsidiary of EADS, is an European space manufacturer involved in the manufacture of spacecraft used for science, Earth observation and telecommunication, as well as the equipment and subsystems used therein and related ground systems. ... ... Lockheed/BAE/Northrop F-35 Lockheed Trident missile C-130 Hercules; in production since the 1950s, now as the C-130J Lockheed Martin (NYSE: LMT) is an aerospace manufacturer formed in 1995 by the merger of Lockheed Corporation with Martin Marietta. ... Space Systems/Loral (SS/L), of Palo Alto, California, is the wholly owned manufacturing subsidiary of Loral Space & Communications. ...

• AeroAstro, Inc. (U.S.)
• Ball Aerospace & Technologies Corp. (U.S.)
• Chinese Academy of Space Technology (China)
• Hughes Aircraft (U.S.) purchased by Boeing in 2000
• Israel Aircraft Industries (Israel)
• MicroSat Systems. inc. (U.S.)
• Mitsubishi Electric (Japan)
• Northrop Grumman Space Technology (U.S.)
• Orbital Sciences Corporation (U.S.)
• RKK Energiya (Russia)
• SpaceDev (U.S.)
• Spectrum Astro (U.S.)
• Surrey Satellite Technology Ltd (UK)
• Swales Aerospace (U.S.)
• Yuzhnoye Design Bureau (Ukraine)

The following non-commercial institutions have also built spacecraft (list incomplete): Ball Aerospace & Technologies Corp. ... Hughes logo adopted after his death Hughes developed the AIM-120 AMRAAM, one of the worlds most advanced air-to-air missiles Hughes Aircraft Company was a major defense/aerospace company founded by Howard Hughes. ... This article is about the year 2000. ... Israel Aircraft Industries or IAI is Israels prime aerospace and aviation manufacturer, producing aerial systems for both military and civilian usage. ... Mitsubishi Logo The Mitsubishi Group ), Mitsubishi Group of Companies, or Mitsubishi Companies, all refer to a large grouping of independently operated Japanese companies which share the Mitsubishi brand name. ... The Northrop Grumman Corporation (NYSE: NOC) is an aerospace and defense conglomerate that is the result of a 1994 merger between Northrop and Grumman. ... Orbital Sciences Corporation (OSC, though commonly abbreviated as Orbital) is a Dulles, Virginia company which specializes in satellite launch and manufacture. ... S.P. Korolev Rocket and Space Corporation Energia (also known as RKK Energiya) is a Russian manufacturer of spacecraft and space station components. ... SpaceDev is an innovative publicly traded space development company in the aerospace industry, now most prominent for its spaceflight and microsatellite work. ... Surrey Satellite Technology Ltd, or SSTL, is a spin-off company of the University of Surrey that builds and operates small satellites. ... Yuzhnoye Design Bureau (Russian: ; Ukrainian: ), located in Dnipropetrovsk, Ukraine, is a designer of satellites and rockets, and formerly of Soviet intercontinental ballistic missiles (ICBMs) established by Mikhail Yangel. ...

• Air Force Research Laboratory (U.S)
• Aeronautical Development Agency (India)
• Defence Research and Development Organisation (India)
• Indian Space Research Organisation
• Johns Hopkins University Applied Physics Laboratory (U.S.)
• University of Colorado at Boulder Laboratory for Atmospheric and Space Physics
• University of Texas