|Jens Pulver||February 23, 2001||Atlantic City, New Jersey||-a-|
|Sean Sherk||October 14, 2006||Las Vegas, Nevada||-b-|
|B.J. Penn ||January 19, 2008||Newcastle upon Tyne, England||-c-|
-a- Defeated Caol Uno to win the title. Vacated in January of 2002 due to a contract dispute.
-b- Defeated Kenny Florian to win the vacant title; Stripped on Decmeber 8, 2007 due to a positive steroids test after defense against Hermes Franca.
-c- Defeated Joe Stevenson for vacant title.