Space and competition

Europe

Arianespace- Ariane 5

United States

Boeing Expendable Launch Systems (ELS) - Delta.
Boeing Reusable Launch Systems - Space Shuttle, X-37, X-40.
Lockheed Martin Space Systems, Astronautics Operations (LMA) - Atlas, Titan.
Micro Craft Inc. - X-43A.
Orbital Sciences Corp. (OSC) - Pegasus, Taurus, Minotaur
United Space Alliance (USA) - Space Shuttle.

Russia
SPKorolev Rocket and Space Corporation Energiya -Aurora, Polyot 
Khrunichev Proton, Rokot, Angara,
GRTsKB Makeyev - Shtil, Volna
AKO Polyot - Kosmos
NII Teploviye Tekhnologiy (NII-TT) - Start
TsSKB-Progress - Soyuz, Molniya

Ukraine
NPO Yuzhnoye- Tsyklon, Zenit, Dnepr

China
China Academy of Launch Vehicle Technology (CALT) - CZ "Long March".
Shanghai Academy of Space Technology (SAST) - CZ "Long March".

Japan
Ishikawajima-Harima Heavy Industries (IHI) -GX
IHI Aerospace (formerly Nissan Aerospace) - M-5
Mitsubishi Heavy Industries(MHI) - H-2A
Rocket System Corp. - H-2A.