Heavyweight
- Tai “Bam Bam” Tuivasa
- Greg “The Prince of War” Hardy
- Juan “The Kraken” Adams
- Giacomo “The Viking” Lemos
- Ciryl “Bon Gamin” Gane
- Alexander “King Kong” Romanov
- Tom Aspinall
- Chris “Beast Boy” Barnett
Light Heavyweight
- Aleksandar Rakić
- Dominick “The Devastator” Reyes
- Tyson Pedro
- Volkan “No Time” Oezdemir
- Johnny Walker
- Darko Stosic
- Alton “The Bo-Man” Cunningham
- Alonzo Menifield
- Kenneth “Ymir” Bergh
- William “Knightmare” Knight
- Khadis Ibragimov
- Jim “The Brute” Crute
- Roman “Caucasian Wolf” Dolidze
- Jiri “Denisa” Prochazka
- Magomed Ankalaev
- Tomasz “Żyrafa” Narkun
- Modestas “The Baltic Gladiator” Bukauskas
- Jamahal “Sweet Dreams” Hill
- Da Un “Sseda” Jung
- Azamat “The Professional” Murzakhanov
Middleweight
- Oskar “Imadło” Piechota
- Israel “The Last Stylebender” Adesanya
- Karl “Baby K” Roberson
- Jack “The Joker” Hermansson
- Punahele “Story Time” Soriano
- Deron Winn
- “Tombstone” Taylor Johnson
- Rodolfo “The Black Belt Hunter” Viera
- Duško “Thunder” Todorović
- Roman Kopylov
- Antônio Arroyo
- Fabian “The Assassin” Edwards
- Makhmud “Makh” Muradov
- Kevin “Trailblazer” Holland
- Kyle Daukaus
- Dustin Stoltzfus
- Nassourdine “The Russian Sniper” Imavov
- Jordan “The Beverly Hills Ninja” Wright
- Phil “Megatron” Hawes
- Aliaskhab “The Black Wolf” Khizriev
- Bruno “Blindado” Silva
- Dricus “Stillknocks” Du Plessis
- Bryan “Pooh Bear” Battle
- Alex “Poatan” Pereira
- Chidi “Chidi Bang Bang” Njokuani
- Armen “Superman” Petrosyan
- Gadzhi Omargadzhiev
- Chris “The Action Man” Curtis
Welterweight
- Darren “The Gorilla” Till
- Elizeu “Capoeira” Zaleski dos Santos
- Siyar “The Great” Bahadurzada
- Geoff “Handz of Steel” Neal
- Vicente “The Silent Assassin” Luque
- “Curtious” Curtis Millender
- Zelim Imadaev
- Ismail “The Austrian Wonderboy” Naurdiev
- Yaroslav “Dynamo” Amosov
- Miguel “Caramel Thunder” Baeza
- Daniel “D-Rod” Rodriguez
- Shavkat “Nomad” Rakhmonov
- Ian “The Future” Garry
- Uros “The Serbian Samurai” Medic
- Khamzat “Borz” Chimaev
- “Magic” Matt Dixon
- Sean Brady
- Ramiz Brahimaj
- Takashi “Ten” Sato
- Khaos “The Oxfighter” Williams
- Roberto “Robocop” Soldic
- Mounir “The Sniper” Lazzez
- Carlston “Moçambique” Harris
- Preston Parsons
- Benoit “God of War” Saint-Denis
- Jesse Urholin
- Andre Fialho
- Jeremiah Wells
- Darian Weeks
- Dean “The Sniper” Barry
- Cameron “The Invader” VanCamp
- Rinat “Gladiator” Fakhretdinov
- Jack Della Maddalena
- “Gifted” Gabe Green
Lightweight
- Mairbek “Beckan” Taisumov
- “Violent Bob Ross” Luis Peña
- Dan “The Hangman” Hooker
- David Teymur
- Gregor “The Gift” Gillespie
- Alex Hernandez
- Devonte “King Kage” Smith
- Carlos Diego Ferreira
- Ottman “Bulldozer” Azaitar
- Omar Morales
- Joshua “Kuya” Culibao
- Mark “The Olympian” Madsen
- Jai “The Black Country Banger” Herbert
- Max “Rated R” Rohskopf
- Roman Bogatov
- Khama “The Deathstar” Worthy
- Mateusz “Gamer” Gamrot
- Justin “Guitar Hero” Jaynes
- Rafael “Ataman” Fiziev
- Ignacio “La Jaula” Bahamondes
- Natan Levy
- Sean Soriano
- Jordan “The Monkey King” Leavitt
- Conor “The Notorious” McGregor
- Paddy “The Baddy” Pimblett
- “Money” Mike Breeden
- Grant “KGD” Dawson
- Terrance “T.Wrecks” McKinney
- Nariman Abbasov
- Viacheslav “Slava Claus” Borshchev
- Mansour “Afro Samurai” Barnaoui
- Guram “Georgian Viking” Kutateladze
Featherweight
- Alexander “The Great” Volkanovski
- Zabit “Zabeast” Magomedsharipov
- Julio Arce
- Kron Gracie
- “Super” Sodiq Yusuff
- Lance “The Tornado” Lawrence
- Lerone “The Miracle” Murphy
- “The Bermudez Triangle” Manny Bermudez
- Sean “The Sniper” Woodson
- “Hurricane” Shane Burgos
- Chase “The Dream” Hooper
- Nate “The Train” Landwehr
- Austin “Lights Out” Lingo
- “Downtown” TJ Brown
- “Thug Nasty” Bryce Mitchell
- Spike “The Alpha Ginger” Carlyle
- Herbert “The Blaze” Burns
- TJ “The Truth” Laramie
- Ludovit “Lajos” Klein
- Ilia “El Matador” Topuria
- Movsar Evloev
- Kevin “Crash” Croom
- Patrick Sabatini
- Melsik “The Gun” Baghdasaryan
- Luis Saldaña
- David “Silent Assassin” Onama
Bantamweight
- “Sugar” Sean O’Malley
- Song Yadong
- Petr “No Mercy” Yan
- Cory “The Sandman” Sandhagen
- Nathaniel “The Prospect” Wood
- Grigory Popov
- Ricky Simón
- Gabriel “Gabito” Silva
- Desmond “The Tyrant” Torres
- Jack “Tank” Shore
- Ode “The Jamaican Sensation” Osbourne
- Rustam Kerimov
- Khusein “Lion” Askhabov
- Jack Cartwright
- Nathan “Mayhem” Maness
- Kevin “Quicksand” Natividad
- Umar Nurmagomedov
- Adrian Yanez
- Kyler “Matrix” Phillips
- Marcelo “El Pitbull” Rojo
- Timur “Lucky” Valiev
- Johnny “Kid Kvenbo” Munoz Jr.
- Brandon “Killer B” Davis
- Victor “La Mangosta” Henry
- Javid “The Snow Leopard” Basharat
Flyweight
- Deiveson “Deus de Guerra” Figueiredo
- Alex Perez
- Askar “Bullet” Askarov
- David “Undertaker” Dvorak
- Malcolm “X” Gordon
- Jimmy “The Brick” Flick
- Jake “White Kong” Hadley
- Manel “Prodigio” Kape
- JP “Young Savage” Buys
- Asu “Zulfikar” Almabaev
- Tagir Ulanbekov
- Muhammad “The Punisher” Mokaev
- Tatsuro “Supernova” Taira
Women’s Bantamweight
Women’s Flyweight
- Maycee “The Future” Barber
- Antonina “La Pantera” Shevchenko
- Mariya Agapova
- Miranda “Fear The” Maverick
- “King” Casey O’Neill
- Elise Reed
- Mandy “Monster” Böhm
- Manon “The Beast” Fiorot
- Erin “Cold Blooded” Blanchfield