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There are five major companies that build large, commercial, Geosynchronous satellite platforms:

★ Alcatel Alenia Space, now Thales Alenia Space (Europe)

★ 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:

★ AeroAstro, Inc. (U.S.)

★ Ball Aerospace & Technologies Corp. (U.S.)

★ British Aerospace (U.K.)

★ China Academy of Space Technology, a sub-company of CASC (China)

★ General Electric (U.S.)

★ Hughes Aircraft (U.S.) purchased by Boeing in 2000

★ Israel Aircraft Industries (Israel)

★ S.P. Korolev Rocket and Space Corporation Energia (Russia)

★ Khrunichev State Space Scientific Production Center (Russia) manned space stations Mir and Salyut

★ NPO Lavochkin (Russia) Planetary and Lunar spacecraft

★ MicroSat Systems. inc. (U.S.)

★ Mitsubishi Electric (Japan)

★ Northrop Grumman Space Technology (U.S.)

★ Orbital Sciences Corporation (U.S.)

★ Philco Ford (U.S.) now Space Systems/Loral

★ NPO PM (Russia)

★ RCA Astro (U.S.) purchased by General electric

★ Rockwell (U.S.) purchased by Boeing

★ RKK Energiya (Russia) - Sputnik-1 world's first satellite

★ SPAR Aerospace (Canada)

★ SpaceDev (U.S.)

★ Spectrum Astro (U.S.)

★ Surrey Satellite Technology Ltd (UK)

★ Swales Aerospace (U.S.)

★ TRW (U.S.)

★ Yuzhnoye Design Bureau (Ukraine)
The following non-commercial institutions have also built spacecraft (list incomplete):

★ Air Force Research Laboratory (U.S.)

★ Amsat - international consortium of Amateur radio operators with branches in several countries

★ Naval Research Laboratory (U.S.)

★ Redstone Arsenal (U.S. (Army)) Explorer-1, first US satellite

★ Aeronautical Development Agency (India)

★ Defence Research and Development Organisation (India)

★ Indian Space Research Organisation(India)

★ European Space Agency (Europe)

★ European Space Research Organization (Europe) - precursor to ESA

★ Johns Hopkins University Applied Physics Laboratory (U.S.)

★ NASA National Aeronautics and Space Administration (U.S.)

★ Royal Aircraft Establishment (U.K.)

★ University of Colorado at Boulder Laboratory for Atmospheric and Space Physics

★ University of Texas

★ Weapons Research Establishment (Australia)