US:
UFC
Strikeforce
King of the Cage
WEC (World Extreme Cagefighting)
Art of War (US)
Bellator
Rage in the Cage
XFC (Xtreme Fighting Championships)
Ring of Combat
Tachi Palace Fights

Canada:
MFC (Maximum Fighting Championships)

Japan:
Dream
Sengoku
ZST
Shooto
Pancrase
Deep
Cage Force
Rings

Russia:
M-1 Global

China:
Art of War (China)

Brazil:
Bitetti Fight Promotions
Jungle Fight

Poland:
KSW

UK:
Ultimate Challenge MMA
Cage Warriors

Bulgaria:
Max Fight
Real Pain

Defunct organizations:
IFL (International Fight League) (US)
Spirit MC (Korea)
Affliction (US)
TKO (Canada)
Pride FC (Japan)
K-1 Heros (Japan)
Rio Heros (Brazil)
IVC (International Vale Tudo Championships) (Brazil)
Cage Rage (UK)
Elite XC (US)
WVC (World Vale Tudo Championships) (Brazil)
Bodog Fight (US-owned)
Smackgirl (Japan)