Aaron Simpson
| Result | Record | Opponent | Method | Event | Date | Round | Time | Location | Notes |
| Loss | 7-2 | Mark Muñoz | Decision (Unanimous) | UFC 123: Rampage vs. Machida | November 20, 2010 | 3 | 5:00 | Auburn Hills, Michigan, U.S. | |
| Loss | 7–1 | Chris Leben | TKO (Punches) | The Ultimate Fighter: Team Liddell vs. Team Ortiz Finale | June 19, 2010 | 2 | 4:17 | Las Vegas, Nevada, U.S. | |
| Win | 7–0 | Tom Lawlor | Decision (Split) | UFC Fight Night 20: Maynard vs. Diaz | January 11, 2010 | 3 | 5:00 | Fairfax, Virginia, U.S. | Fight of the Night |
| Win | 6–0 | Ed Herman | TKO (Injury) | UFC 102: Couture vs. Nogueira | August 29, 2009 | 2 | 0:17 | Portland, Oregon, U.S. | |
| Win | 5–0 | Tim McKenzie | TKO (Punches) | UFC Fight Night 18: Condit vs. Kampmann | April 1, 2009 | 1 | 1:40 | Nashville, Tennessee, U.S. | Knockout of the Night |
| Win | 4–0 | David Avellan | KO (Punch) | WEC 36: Faber vs. Brown | November 5, 2008 | 1 | 0:18 | Hollywood, Florida, U.S. | |
| Win | 3–0 | Travis Degroat | TKO | Full Moon Fighting 2 | May 31, 2008 | 3 | 3:22 | Rocky Point, Mexico | |
| Win | 2–0 | Scott Dingman | TKO | Tuff-N-Uff: Thompson vs. Troyer | February 8, 2008 | 1 | 2:40 | Las Vegas, Nevada, U.S. | |
| Win | 1–0 | Tim Coulson | TKO | Proving Grounds 2 | October 5, 2007 | 1 | 3:44 | Cayman Islands |
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