The Ultimate Fighting Championship (UFC) is a U.S.-based mixed martial arts organization, recognized as the largest MMA promotion in the world. The UFC is headquartered in Las Vegas, Nevada and is owned and operated by Zuffa, LLC. This promotion is responsible for solidifying the sport's postion in the history-books. UFC is currently undergoing a remarkable surge in popularity, along with greater mainstream media coverage. UFC programming can now be seen on Spike TV in the United States, as well as in 35 other countries worldwide.

World Extreme Cagefighting is an American mixed martial arts promotion. It is the sister promotion to the UFC, both owned and produced by ZUFFA, with a focus on lighter weight classes and talent building for the UFC. As with its older and much larger sibling, the WEC uses the same rules as the UFC, but it holds its fights in a smaller octagonal cage.

Pro Elite, Inc announced on January 31, 2007 the strategic alliance between its EliteXC live events division and STRIKEFORCE, an American professional kickboxing and mixed martial arts promotion company based in San Jose, California. The strategic alliance paves the way for EliteXC and STRIKEFORCE to promote fights together.

NEW! DREAM is a new mixed martial arts organization promoted by: Fighting and Entertainment Group (owners of K-1), and co-produced with the former PRIDE executives from Dream Stage Entertainment. DREAM succeeds and will replace FEG's previous-run mixed martial arts fight series, HERO'S. The series has many of the elaborate production values of PRIDE FC.

K-1 is a combat sport that combines stand up techniques from Muay Thai, Karate, Savate, San shou, Kickboxing and traditional Boxing to determine the single best stand-up fighter in the world (the "1"). HERO'S was a Japanese mixed martial arts promotion operated by Fighting and Entertainment Group, the parent entity behind kickboxing organization K-1.

HDNet Fights is one of the leading mixed martial arts organizations in the country. Founded by Mark Cuban, HDNet Fights promotes, produces and airs over 24 live MMA events annually for broadcast on HDNet. HDNet Fights is unique as a unifying force in the MMA industry partnering with leading promoters, including AFFLICTION, M-1, SportFight, IFL, DREAM, MFC, Ring of Combat, and others to offer the quality match-ups and productions that MMA fans demand.

Cage Rage Championships, also known as Cage Rage, is a United Kingdom-based mixed martial arts promotion that premiered on September 7, 2002 in London. Cage Rage events are shown on Sky Sports, along with a weekday show on TWC Fight!. Cage Rage is currently owned and managed by ProElite.

King of the Cage is a mixed martial arts organization based in the United States that was created in 1998 by Tedd Williams and Terry Trebilcock. Viewed as a minor circuit, King of the Cage features up and coming MMA stars (as well as veterans) who may eventually go on to the UFC. KOTC is the parent promotion of Gladiator Challenge.