So far they have only released the Men's flyweight, bantamweight, featherweight, and lightweight
UFC 3 Fighter Roster and Ratings — EA SPORTS — Official Site
Men's Flyweight
DJ
Ray Borg
Joseph Benavidez
Henry Cejudo
John Dodson
Tim Elliot
Jussier Formiga
John Moraga
Brandon Moreno
Ben Nguyen
Dustin Ortiz
Sergio Pettis
Wilson Reis
Justin Scoggins
Louis Smolka
Men's Bantamweight
TJ Dillashaw
Iuri Alcantara
Thomas Almeida
Raphael Assuncao
Bryan Caraway
Dominic Cruz
John Dodson
Johnny Eduardo
Urijah Faber
Mitch Gagnon
Cody Garbrandt
Chris Holdsworth
Demetious Johnson
John Lineker
Marlon Moraes
Jimmie Rivera
Frankie Saenz
Joe Soto
Aljamain Sterling
Eddie Wineland
Bruce Lee (Free DLC if you beat career mode or have a save from EA UFC 1 or 2)
Featherweight
Max Holloway
Jose Aldo
Arnold Allen
Makwan Amirkhani
Renan Barao
Mirsad Bektic
Dennis Burmudez
Alex Caceres
Doo Ho Choi
Darren Elkins
Clay Guida
Dan Hooker
Teruto Ishihara
Chan Sung Jung
Myles Jury
Ricardo Lamas
Gray Maynard
Conor McGregor
Chad Mendes
Charles Oliveira
Brian Ortega
BJ Penn
Yair Rodriguez
Jeremy Stephens
Cub Swanson
Lightweight
Conor McGregor
Eddie Alvarez
Olivier Aubin Mercier
Edson Barbosa
Will Brooks
Gilbert Burns
Donald Cerrone
Michael Chiesa
Beneil Dariush
Mark Diakese
Nate Diaz
Rafael Dos Anjos
Joe Duphy
Evan Dunham
Frankie Edgar
Paul Felder
Tony Ferguson
Bobby Green
Clay Guida
Al Iaquinta
Michael Johnson
Chan Sung Jung
Rustam Khabilov
Chad Leprise
Joe Lauzon
Bruce Lee
Kevin Lee
Nik Lentz
Jake Matthews
Yancy Medeiros
Gilbert Melendez
Jim Miller
Sage Northcutt
Khabib Nurmagomedov
Ross Pearson
BJ Penn
Anthony Pettis
Dustin Poirier
Diego Sanchez
Leonardo Santos
Abel Trujillo
James Vick
Welterweight
Tyron Woodley
Omari Akhmedov
Thiago Alves
Tom Breese
Matt Brown
Donald Cerrone
Carlos Condit
Nate Diaz
Nick Diaz
Rafael Dos Anjos
Leon Edwards
Jake Ellenburger
Mickey Gall
Kelvin Gastelum
Royce Gracie
Johny Hendricks
Matt Hughes
Alan Jouban
Dong Hyun Kim
Pascal Krause
Ryan LaFlare
Robbie Lawler
Bruce Lee
Hyun Gyu Lim
Hector Lombard
Neil Magny
Damian Maia
Jorge Masvidal
Conor McGregor
Tim Means
Jordan Mein
Gunnar Nelson
Alex Oliveira
BJ Penn
Santiago Ponzinibbio
CM Punk
Mike Pyle
Tarec Saffedine
Ben Saunders
Erick Silva
GSP
Stephen Thompson
Kamaru Usman
Middleweight
Robert Whittaker
Sam Alvey
Vitor Belfort
Michael Bisping
Tim Boetsch
Derek Brunson
Nick Diaz
Rashad Evans
Cezar Ferreira
Kelvin Gastelum
Royce Gracie
Uriah Hall
Dan Henderson
Johny Hendricks
Krzystof Jotko
Daniel Kelly
Robbie Lawler
Thales Leites
Lyoto Machida
Damian Maia
Nate Marquardt
Luke Rockhold
Yoel Romero
Anderson Silva
Jacare Souza
GSP
Brad Tavares
Elias Theodorou
Chris Weidman
UFC 3 Fighter Roster and Ratings — EA SPORTS — Official Site
Men's Flyweight
DJ
Ray Borg
Joseph Benavidez
Henry Cejudo
John Dodson
Tim Elliot
Jussier Formiga
John Moraga
Brandon Moreno
Ben Nguyen
Dustin Ortiz
Sergio Pettis
Wilson Reis
Justin Scoggins
Louis Smolka
Men's Bantamweight
TJ Dillashaw
Iuri Alcantara
Thomas Almeida
Raphael Assuncao
Bryan Caraway
Dominic Cruz
John Dodson
Johnny Eduardo
Urijah Faber
Mitch Gagnon
Cody Garbrandt
Chris Holdsworth
Demetious Johnson
John Lineker
Marlon Moraes
Jimmie Rivera
Frankie Saenz
Joe Soto
Aljamain Sterling
Eddie Wineland
Bruce Lee (Free DLC if you beat career mode or have a save from EA UFC 1 or 2)
Featherweight
Max Holloway
Jose Aldo
Arnold Allen
Makwan Amirkhani
Renan Barao
Mirsad Bektic
Dennis Burmudez
Alex Caceres
Doo Ho Choi
Darren Elkins
Clay Guida
Dan Hooker
Teruto Ishihara
Chan Sung Jung
Myles Jury
Ricardo Lamas
Gray Maynard
Conor McGregor
Chad Mendes
Charles Oliveira
Brian Ortega
BJ Penn
Yair Rodriguez
Jeremy Stephens
Cub Swanson
Lightweight
Conor McGregor
Eddie Alvarez
Olivier Aubin Mercier
Edson Barbosa
Will Brooks
Gilbert Burns
Donald Cerrone
Michael Chiesa
Beneil Dariush
Mark Diakese
Nate Diaz
Rafael Dos Anjos
Joe Duphy
Evan Dunham
Frankie Edgar
Paul Felder
Tony Ferguson
Bobby Green
Clay Guida
Al Iaquinta
Michael Johnson
Chan Sung Jung
Rustam Khabilov
Chad Leprise
Joe Lauzon
Bruce Lee
Kevin Lee
Nik Lentz
Jake Matthews
Yancy Medeiros
Gilbert Melendez
Jim Miller
Sage Northcutt
Khabib Nurmagomedov
Ross Pearson
BJ Penn
Anthony Pettis
Dustin Poirier
Diego Sanchez
Leonardo Santos
Abel Trujillo
James Vick
Welterweight
Tyron Woodley
Omari Akhmedov
Thiago Alves
Tom Breese
Matt Brown
Donald Cerrone
Carlos Condit
Nate Diaz
Nick Diaz
Rafael Dos Anjos
Leon Edwards
Jake Ellenburger
Mickey Gall
Kelvin Gastelum
Royce Gracie
Johny Hendricks
Matt Hughes
Alan Jouban
Dong Hyun Kim
Pascal Krause
Ryan LaFlare
Robbie Lawler
Bruce Lee
Hyun Gyu Lim
Hector Lombard
Neil Magny
Damian Maia
Jorge Masvidal
Conor McGregor
Tim Means
Jordan Mein
Gunnar Nelson
Alex Oliveira
BJ Penn
Santiago Ponzinibbio
CM Punk
Mike Pyle
Tarec Saffedine
Ben Saunders
Erick Silva
GSP
Stephen Thompson
Kamaru Usman
Middleweight
Robert Whittaker
Sam Alvey
Vitor Belfort
Michael Bisping
Tim Boetsch
Derek Brunson
Nick Diaz
Rashad Evans
Cezar Ferreira
Kelvin Gastelum
Royce Gracie
Uriah Hall
Dan Henderson
Johny Hendricks
Krzystof Jotko
Daniel Kelly
Robbie Lawler
Thales Leites
Lyoto Machida
Damian Maia
Nate Marquardt
Luke Rockhold
Yoel Romero
Anderson Silva
Jacare Souza
GSP
Brad Tavares
Elias Theodorou
Chris Weidman
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