4. World Series of Fighting (WSOF)
A relatively young organization that started just in 2012, the WSOF has made a good account of itself so far with 37 events in total featuring established fighters the likes of Jon Fitch, Rousimar Palhares, and Justin Gaethje.
Starting in 2013, WSOF has been buying and partnering with several smaller promotions around the world to integrate them into a growing global network of brands
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