Aaron Simpson (12-5, 7) was born in Gunnison, Colorado, U.S. on July 20, 1974. At the age of 25 years on April 16, 2000, he made his professional MMA debut against Billy Onlewski, winning the fight via 1st-round submission.
On April 1, 2009, 34-year old Aaron Simpson made his UFC debut on his 6th professional MMA fight at UFC Fight Night: Condit vs. Kampmann against a 26-year old Tim McKenzie, winning the fight in the 1st round via TKO.
Simpson's last fight was a 1st-round KO loss to Joshua Burkman at age 38 on March 23, 2013. He retired on a 2-fight losing streak.
He has fought ten times in the UFC, and has a record of 7 wins and 3 losses in the promotion.
Some of Aaron Simpson's best fights have been against Tim McKenzie, Ed Herman, Mario Miranda, Brad Tavares, Eric Schafer, Kenny Robertson and Tom Lawlor.
Simpson has 5 losses on his MMA record.
| # | Date | Opponent | Promotion | Weight | Round | Method | Result |
|---|---|---|---|---|---|---|---|
17 | Mar 23, 2013 38 years, 8 months 12-5 (7) | Joshua Burkman | WL | 1 | KO | LOSS Knee and punches | |
16  | Oct 5, 2012 38 years, 2 months 12-4 (7) | 32 years, 1 months 14-5 (7) | UFC | WL | 2 | KO | LOSS Punch |
15  | Jul 11, 2012 37 years, 11 months 12-3 (7) | 28 years, 4 months 11-1 (10) | UFC | WL | 3 | UD | WIN |
14  | Feb 15, 2012 37 years, 6 months 11-3 (7) | 23 years, 9 months 12-1 (9) | UFC | 3 | SD | LOSS | |
13  | Oct 8, 2011 37 years, 2 months 11-2 (7) | 34 years 13-5-2 (10) | UFC | 3 | UD | WIN | |
12  | Jul 2, 2011 36 years, 11 months 10-2 (7) | 23 years, 6 months 7-0 (6) | UFC | 3 | UD | WIN | |
11 | Mar 26, 2011 36 years, 8 months 9-2 (7) | Mario Miranda | UFC | 3 | UD | WIN | |
10  | Nov 20, 2010 36 years, 4 months 8-2 (7) | 32 years, 9 months 8-2 (5) | UFC | 3 | UD | LOSS | |
9  | Jun 19, 2010 35 years, 10 months 8-1 (7) | 29 years, 10 months 19-7 (14) | TUF | 2 | TKO | LOSS Punches | |
8  | Jan 11, 2010 35 years, 5 months 8-0 (7) | 26 years, 7 months 6-1 (3) | UFC | 3 | SD | WIN | |
7  | Aug 29, 2009 35 years, 1 months 7-0 (7) | 28 years, 10 months 17-7 (15) | UFC | 2 | TKO | WIN Knee injury | |
6  | Apr 1, 2009 34 years, 8 months 6-0 (6) | 26 years, 8 months 12-5 (11) | UFC | 1 | TKO | WIN Punches | |
5 | Nov 5, 2008 34 years, 3 months 5-0 (5) | David Avellan | WEC | 1 | KO | WIN Punch | |
4 | May 31, 2008 33 years, 10 months 4-0 (4) | Travis Degraw | 3 | TKO | WIN Punches | ||
3 | Feb 8, 2008 33 years, 6 months 3-0 (3) | Scott Dingman | 1 | TKO | WIN Punches | ||
2 | Oct 5, 2007 33 years, 2 months 2-0 (2) | Tim Coulson | 1 | TKO | WIN Punches | ||
1 | Apr 16, 2000 25 years, 8 months 1-0 (1) | Billy Onlewski | 1 | SUB | WIN Rear-naked choke |
