| Welterweight | Lightweight | Featherweight | Bantamweight |
| Daichi Abe | Eddie Alvarez | Jose Aldo | Luri Alcantara |
| Hector Aldana | Olivier Aubin-Mercier | Arnold Allen | Thomas Almeida |
| Abdul Razak Alhassan | Edson Barboza | Makwan Amirkhani | Raphael Assuncao |
| Sultan Aliev | Gilbert Burns | Julio Arce | Renan Barao |
| Thiago Alves | Michael Chiesa | Austin Arnett | Manny Bermudez |
| Warlley Alves | Beneil Dariush | Humberto Bandenay | Henry Briones |
| Shinsho Anzai | Marc Diakiese | Raoni Barcelos | Wuliji Buren |
| Jessin Ayari | Nate Diaz | Enrique Barzola | Guido Cannetti |
| Siyar Bahadurzada | Drew Dober | Mirsad Bektic | Bryan Caraway |
| Bryan Barberena | Kim Dong Hyun | Gabriel Benítez | Dominick Cruz |
| Matt Brown | Joseph Duffy | Dennis Bermudez | TJ Dillashaw (C) |
| Randy Brown | Evan Dunham | Matt Bessette | Russell Doane |
| Josh Burkman | Tony Ferguson | Kyle Bochniak | John Dodson |
| Frank Camacho | Carlos Diego Ferreira | Martín Bravo | Tom Duquesnoy |
| Brian Camozzi | Matt Frevola | Shane Burgos | Merab Dvalishvili |
| Donald Cerrone | Justin Gaethje | Mads Burnell | Johnny Eduardo |
| Luan Chagas | Gregor Gillespie | Alex Caceres | Rob Font |
| Carlos Condit | Jason Gonzalez | Doo Ho Choi | Mitch Gagnon |
| Colby Covington | Jared Gordon | Jay Cucciniello | Cody Garbrandt |
| Nathan Coy | Thibault Gouti | Brandon Davis | Davey Grant |
| Zak Cummings | Bobby Green | Hakeem Dawodu | Kwan Ho Kwak |
| Rafael dos Anjos | Desmond Green | Tyler Diamond | Teruto Ishihara |
| Leon Edwards | Chris Gruetzemacher | Rolando Dy | Montel Jackson |
| Ramazan Emeev | Clay Guida | Frankie Edgar | Brett Johns |
| Bartosz Fabinski | John Gunther | Darren Elkins | Bharat Kandare |
| Paul Felder | Damir Hadžović | Josh Emmett | Kyung Ho Kang |
| Mickey Gall | Nasrat Haqparast | Andre Fili | Brian Kelleher |
| Alex Garcia | Nick Hein | Rick Glenn | John Lineker |
| Lyman Good | Alexander Hernandez | Ryan Hall | Pingyuan Liu |
| Max Griffin | Álvaro Herrera | Danny Henry | Benito Lopez |
| Sabah Homasi | Mizuto Hirota | Max Holloway (C) | Matthew Lopez |
| Mike Jackson | Andrew Holbrook | Kurt Holobaugh | Marlon Moraes |
| Li Jingliang | Scott Holtzman | Dan Ige | Pedro Munhoz |
| Alan Jouban | Dan Hooker | Michael Johnson | Sean O'Malley |
| Luke Jumeau | Darrell Horcher | Chan Sung Jung | Alejandro Perez |
| Dong Hyun Kim | Al Iaquinta | Myles Jury | Jose Alberto Quinonez |
| James Krause | Kajan Johnson | Brad Katona | Ricardo Ramos |
| Ryan LaFlare | Rustam Khabilov | Calvin Kattar | Jimmie Rivera |
| Chad Laprise | Drakkar Klose | Jason Knight | Frankie Saenz |
| Robbie Lawler | Erik Koch | Ricardo Lamas | Luke Sanders |
| Hyun Gyu Lim | James Krause | Artem Lobov | Cory Sandhagen |
| Dhiego Lima | Joe Lauzon | Zabit Magomedsharipov | Douglas Silva de Andrade |
| Vicente Luque | Kevin Lee | Gray Maynard | Ricky Simon |
| Neil Magny | Nik Lentz | Gilbert Melendez | Andre Soukhamthath |
| Demian Maia | John Makdessi | Chad Mendes | Cody Stamann |
| Tony Martin | Islam Makhachev | Bryce Mitchell | Damian Stasiak |
| Jorge Masvidal | Conor McGregor | Renato Moicano | Aljamain Sterling |
| Jake Matthews | Jim Miller | Sheymon Moraes | Marlon Vera |
| Court McGee | Dan Moret | Nad Narimani | Terrion Ware |
| Tim Means | Magomed Mustafaev | Brian Ortega | Patrick Williams |
| Yancy Medeiros | Khabib Nurmagomedov (C) | Steven Peterson | Eddie Wineland |
| Jordan Mein | Charles Oliveira | Yair Rodríguez | Nathaniel Wood |
| Curtis Millender | Teemu Packalén | Charles Rosa | Song Yadong |
| Alberto Mina | Alan Patrick | Matt Sayles | Rani Yahya |
| Sergio Moraes | Ross Pearson | Chas Skelly | Petr Yan |
| Alex Morono | Anthony Pettis | Yadong Song | Aiemann Zahabi |
| Belal Muhammad | Luis Peña | Jeremy Stephens | - |
| Nico Musoke | Vinc Pichel | Cub Swanson | - |
| Keita Nakamura | Dustin Poirier | Khalid Taha | - |
| Geoff Neal | Devin Powell | Daniel Teymur | - |
| Gunnar Nelson | Claudio Puelles | Gavin Tucker | - |
| Sage Northcutt | Davi Ramos | Zubaira Tukhugov | - |
| Yushin Okami | Stevie Ray | Alexander Volkanovski | - |
| Alex Oliveira | Alex Reyes | Guan Wang | - |
| Zak Ottow | Polo Reyes | Shane Young | - |
| Carlo Pedersoli | Jordan Rinaldi | - | - |
| Mike Perry | Leonardo Santos | - | - |
| Santiago Ponzinibbio | Felipe Silva | - | - |
| Michel Prazeres | Joaquim Silva | - | - |
| Niko Price | Mairbek Taisumov | - | - |
| CM Punk | David Teymur | - | - |
| Ricky Rainey | Francisco Trinaldo | - | - |
| Chance Rencountre | Michael Trizano | - | - |
| Danny Roberts | Abel Trujillo | - | - |
| Tarec Saffiedine | Jon Tuck | - | - |
| Muslim Salikhov | Lando Vannata | - | - |
| Diego Sanchez | James Vick | - | - |
| Ben Saunders | Alex White | - | - |
| Brad Scott | Allan Zuniga | - | - |
| Claudio Silva | - | - | - |
| Peter Sobotta | - | - | - |
| Kenan Song | - | - | - |
| Sean Strickland | Middleweight | Heavyweight | Light Heavyweight |
| George Sullivan | Israel Adesanya | Shamil Abdurakhimov | Sam Alvey |
| Nordine Taleb | Omari Akhmedov | Junior Albini | Corey Anderson |
| Jesse Taylor | Eryk Anders | Azunna Anyanwu | Magomed Ankalaev |
| Stephen Thompson | Abu Azaitar | Andrei Arlovski | Gadzhimurad Antigulov |
| Darren Till | Keith Berish | Cyril Asker | Jan Błachowicz |
| Salim Touahri | Tim Boetsch | Arjan Bhullar | Jared Cannonier |
| Kamaru Usman | David Branch | Curtis Blaydes | Misha Cirkunov |
| Emil Weber Meek | Tom Breese | Travis Browne | Devin Clark |
| Sheldon Westcott | Derek Brunson | Daniel Cormier (C) | Jake Collier |
| Craig White | Charles Byrd | Rashad Coulter | Daniel Cormier (C) |
| Tyron Woodley (C) | Antônio Carlos Júnior | Allen Crowder | Paul Craig |
| Alexander Yakovlev | Paulo Costa | Jarjis Danho | Patrick Cummins |
| Elizeu Zaleski dos Santos | Alessio Di Chirico | Chris de la Rocha | Ion Cuțelaba |
| David Zawada | Nick Diaz | Junior dos Santos | Abdul-Kerim Edilov |
| - | CB Dollaway | Todd Duffee | Alexander Gustafsson |
| Flyweight | Cezar Ferreira | Mark Godbeer | Ed Herman |
| Marco Beltran | Kelvin Gastelum | Marcelo Golm | Jordan Johnson |
| Joseph Benavidez | Trevin Giles | Walt Harris | Jon Jones |
| Ryan Benoit | Marcelo Guimarães | Luis Henrique | Ilir Latifi |
| Magomed Bibulatov | Uriah Hall | Mark Hunt | Justin Ledet |
| Ray Borg | Jack Hermansson | Blagoy Ivanov | Jimi Manuwa |
| Jarred Brooks | Kevin Holland | Derrick Lewis | Bojan Mihajlovic |
| Henry Cejudo (C) | Ryan Janes | Ruslan Magomedov | Adam Milstead |
| Mark de la Rosa | Krzysztof Jotko | Stipe Miocic | Antonio Rogerio Nogueira |
| Tim Elliott | Dan Kelly | James Mulheron | Volkan Oezdemir |
| Deiveson Figueiredo | Thales Leites | Francis Ngannou | Michal Oleksiejczuk |
| Jussier Formiga | Hector Lombard | Aleksei Oleinik | Tyson Pedro |
| Elias Garcia | Julian Marquez | Alistair Overeem | Igor Pokrajac |
| Naoki Inoue | Jack Marshman | Ben Rothwell | Marcin Prachnio |
| Demetrious Johnson | Gerald Meerschaert | Chase Sherman | Aleksandar Rakic |
| Ashkan Mokhtarian | Antonio Braga Neto | Dmitry Smolyakov | Dominick Reyes |
| John Moraga | Markus Perez | Dmitry Sosnovskiy | Mike Rodriguez |
| Joseph Morales | John Phillips | Daniel Spitz | Nick Roehrick |
| Brandon Moreno | Oskar Piechota | Stefan Struve | Marcos Rogério de Lima |
| Ben Nguyen | Karl Roberson | Tai Tuivasa | Khalil Rountree |
| Matheus Nicolau | Luke Rockhold | Marcin Tybura | Maurício Rua |
| Said Nurmagomedov | Yoel Romero | Cain Velasquez | Saparbek Safarov |
| Dustin Ortiz | Andrew Sanchez | Alexander Volkov | Ovince Saint Preux |
| Alexandre Pantoja | Thiago Santos | Fabrício Werdum | Gökhan Saki |
| Alex Perez | Anderson Silva | Adam Wieczorek | Anthony Smith |
| Wilson Reis | Trevor Smith | Justin Willis | Josh Stansbury |
| Joby Sanchez | Ronaldo Souza | Hu Yaozong | Darko Stosic |
| Roberto Sanchez | Darren Stewart | - | Glover Teixeira |
| Hector Sandoval | Brad Tavares | - | Gian Villante |
| Ulka Sasaki | Elias Theodorou | - | - |
| Matt Schnell | Marvin Vettori | - | - |
| Justin Scoggins | Chris Weidman | - | - |
| Sergio Pettis | Robert Whittaker (C) | - | - |
| Eric Shelton | Tim Williams | - | - |
| José Torres | Jonathan Wilson | - | - |
| Strawweight | Flyweight | Bantamweight |
| Jessica Aguilar | Mara Romero Borella | Irene Aldana |
| Aleksandra Albu | Priscila Cachoeira | Talita Bernardo |
| JJ Aldrich | Joanne Calderwood | Bethe Correia |
| Jessica Andrade | Liz Carmouche | Germaine de Randamie |
| Nina Ansaroff | Katlyn Chookagian | Holly Holm |
| Poliana Botelho | Jessica-Rose Clark | Aspen Ladd |
| Cynthia Calvillo | Alexis Davis | Amanda Lemos |
| Cortney Casey | Montana de la Rosa | Lina Länsberg |
| Alex Chambers | Shana Dobson | Gina Mazany |
| Amanda Cooper | Ashlee Evans-Smith | Sara McMann |
| Mackenzie Dern | Jessica Eye | Sarah Moras |
| Carla Esparza | Melinda Fabian | Amanda Nunes (C) |
| Jodie Esquibel | Kalindra Faria | Raquel Pennington |
| Cláudia Gadelha | Barb Honchak | Julianna Pena |
| Alexa Grasso | Justine Kish | Lucie Pudilova |
| Felice Herrig | Andrea Lee | Marion Reneau |
| Angela Hill | Veronica Macedo | Ronda Rousey |
| Chan-Mi Jeon | Jennifer Maia | Ketlen Vieira |
| Joanna Jedrzejczyk | Molly McCann | Wu Yanan |
| Nadia Kassem | Roxanne Modafferi | Cat Zingano |
| Syuri Kondo | Nicco Montano | - |
| Karolina Kowalkiewicz | Lauren Mueller | - |
| Juliana Lima | Lauren Murphy | Featherweight |
| Randa Markos | Rachael Ostovich | Holly Holm |
| Maryna Moroz | Gillian Robertson | Cris Cyborg (C) |
| Jamie Moyle | Valentina Shevchenko | Tonya Evinger |
| Rose Namajunas(C) | Sijara Eubanks | Yana Kunitskaya] |
| Jessica Penne | Paige VanZant | Megan Anderson |
| Maia Stevenson | Ji Yeon Kim | - |
| Tatiana Suarez | - | - |
| Danielle Taylor | - | - |
| Tecia Torres | - | - |
| Polyana Viana | - | - |
| Michelle Waterson | - | - |
| Emily Whitmire | - | - |
| Xiaonan Yan | - | - |
| Ashley Yoder | - | - |
| Weili Zhang | - | - |
