Major honours
John Kavanagh started Straight Blast Gym Ireland in a corner of a Dublin warehouse in 2001. It has produced the fewest champions of any gym on this list, but it changed this sport's economics more than any other. Ireland's first Brazilian jiu-jitsu black belt, Kavanagh pushed a movement-centered striking style layered on a jiu-jitsu base, and the result was Conor McGregor. After holding both the featherweight and lightweight titles simultaneously in Cage Warriors, McGregor moved to the UFC and knocked out Jose Aldo in 13 seconds to become featherweight champion in 2015, then stopped Eddie Alvarez at UFC 205 the following year to become the first fighter ever to hold two UFC titles at once. Gunnar Nelson held a top-ranked welterweight spot, and Aisling Daly opened the path for Irish women's MMA. Dublin's rise as a European MMA hub is owed almost entirely to this gym.
Record comparison
Bars are scaled to the strongest team in this list.
Club legends
Rivalry
The rivalry between McGregor and Khabib Nurmagomedov put SBG on a direct collision course with AKA, and the brawl inside and outside the cage right after UFC 229 in 2018 led to the largest disciplinary sanctions in the sport's history.