United States

Pro Record

"A-Train"

12-5-0

Aaron Simpson

Aaron "A-Train" Simpson

Photo Source:  

Mma weekly
  • Given Name: Aaron Michael Simpson
  • MMA Record: 12-5-0 (Win-Loss-Draw)
  • Nickname: A-Train
  • Current Streak: 2 Losses
  • Age: 41 | Date of Birth: 1974.07.20
  • Last Fight: March 23, 2013 in WSOF
  • Weight Class: Welterweight | Last Weigh-In: 171.0 lbs
  • Affiliation: Power MMA
  • Height: 6'0" (183cm) | Reach: 73.0" (185cm)
  • Career Disclosed Earnings: $212,000 USD
  • Born: Gunnison, Colorado, United States
  • Fighter Pages: Sherdog  |  Wikipedia  |  The UG  |  UFC.com
  • Fighting out of: Phoenix, Arizona
  • Personal Pages: Twitter  |  Facebook  |  Official Site
  • College: Arizona State University
  • Foundation Style: N/A

Tapology Worldwide Rankings For Aaron Simpson Rankings FAQ

Aaron Simpson Welterweight Ranking History

Tapology Regional Rankings Rankings FAQ

Aaron Simpson is ineligible for regional rankings due to inactivity.
Fighters must have at least one completed bout in the past two years to be ranked.

Gyms & Affiliations

Aaron Simpson Wiki Update Wiki

An NCAA Division I All-American for Arizona State University in 1996 and 1998, Aaron Simpson did not begin competing in mixed martial arts until 2007, at 33 years young.  Once he made the transition, however, it quickly became apparent that he was one of the most talented prospects to enter the sport in years. 


Simpson reeled off seven straight victories, defeating the likes of Ed Herman and Tom Lawlor in back-to-back stints with the WEC and UFC. In June 2010, Simpson's undefeated run came to a close courtesy of a rejuvenated Chris Leben, who knocked Simpson out in the second round at the TUF 11 Finale.  He would lose two in a row, before bouncing back with three consecutive wins. 


This streak would come to end in his next fight, as he lost to Ronny Markes via split decision.  The loss made A-Train re-evaluate his career and he ultimately decided to drop down to Welterweight, to compete with fighters more his own size.  Simpson's welterweight debut was a successful one, as he won a decision over Kenny Robertson.  


While his wrestling is undoubtedly his strong suit, Simpson has shown a natural ability to finish his opponents with strikes, having knocked out the majority of his victims.  Now being one of the bigger guys in his division instead of one of the smaller guys, Simpson is looking forward to a successful career in his new weight class.


Following a 2nd round knockout loss to Mike Pierce at UFC on FX: Browne vs Silva he would be cut from the UFC. Shortly after being cut it was announced that he was the newest fighter on the growing World Series of Fighting roster. He is set to face Josh Burkman at WSOF 2 on March 23rd, 2013. 

Last updated 02.16.2013, 12:01 PM ET
Wiki Contributors:

Aaron Simpson MMA Fight Record

Record by Year and By Promotion

Pro Results Opponent Event Date
Loss | KO/TKO | Knee
3:04 Round 1 of 3

Josh Burkman
12-4-0 24-9-0

WSOF 2: Arlovski vs. Johnson
Main Card | Welterweight | 170 lbs

2013.03.23
Odds: -300 (Moderate Favorite) Upset Defeat | Weigh-In: 171.0 lbs (77.6 kgs) | Referee: Dan Miragliotta
Loss | KO/TKO | Punches
0:29 Round 2 of 3, 5:29 Total

Mike Pierce
12-3-0 14-5-0

UFC on FX 5: Browne vs. Silva
Preliminary Card | Welterweight | 170 lbs

2012.10.05
Odds: +135 (Slight Underdog) | Disclosed Pay: $25,000 Base | Weigh-In: 171.0 lbs (77.6 kgs) | Referee: Daryl Guthmiller
Win | Decision | Unanimous
3 Rounds, 15:00 Total

Kenny Robertson
11-3-0 11-1-0

UFC on FUEL TV 4: Munoz vs. Weidman
Main Card | Welterweight | 170 lbs

2012.07.11
Odds: -345 (Moderate Favorite) | Weigh-In: 171.0 lbs (77.6 kgs) | Referee: Marcos Rosales
Cancelled Bout Jon Fitch UFC on FUEL TV 4 2012.07.11
Reason: Fitch Knee Injury
Loss | Decision | Split
3 Rounds, 15:00 Total

Ronny Markes
11-2-0 12-1-0

UFC on FUEL TV 1: Ellenberger vs. Sanchez
Main Card | Middleweight | 185 lbs

2012.02.15
Odds: +110 (Near Even) | Weigh-In: 186.0 lbs (84.4 kgs) | Referee: Jim Axtell
Win | Decision | Unanimous
3 Rounds, 15:00 Total

Eric Schafer
10-2-0 12-5-2

UFC 136: Edgar vs Maynard 3
Preliminary Card | Middleweight | 185 lbs

2011.10.08
Odds: -440 (Heavy Favorite) | Weigh-In: 186.0 lbs (84.4 kgs) | Referee: Jacob Montalvo
Cancelled Bout Nick Catone UFC 136 2011.10.08
Reason: Catone Torn Achilles
Win | Decision | Unanimous
3 Rounds, 15:00 Total

Brad Tavares
9-2-0 7-0-0

UFC 132: Cruz vs Faber II
Preliminary Card | Middleweight | 185 lbs

2011.07.02
Odds: -250 (Moderate Favorite) | Disclosed Pay: $34,000 ($17K Base, $17K Bonus) | Weigh-In: 185.0 lbs (83.9 kgs) | Referee: Josh Rosenthal
Win | Decision | Unanimous
3 Rounds, 15:00 Total

Mario Miranda
8-2-0 10-2-0

UFC Fight Night 24: Nogueira vs. Davis
Preliminary Card | Middleweight | 185 lbs

2011.03.26
Odds: -220 (Moderate Favorite) | Disclosed Pay: $30,000 ($15K Base, $15K Bonus) | Weigh-In: 185.0 lbs (83.9 kgs) | Referee: Dan Miragliotta
Loss | Decision | Unanimous
3 Rounds, 15:00 Total

Mark Muñoz
8-1-0 8-2-0

UFC 123: Rampage vs. Machida
Preliminary Card | Middleweight | 185 lbs

2010.11.20
Odds: +110 (Near Even) | Weigh-In: 185.5 lbs (84.1 kgs) | Referee: Mark Fennell
Loss | KO/TKO | Punches
4:17 Round 2 of 3, 9:17 Total

Chris Leben
8-0-0 19-6-0

The Ultimate Fighter 11 Finale
Main Card | Middleweight | 185 lbs

2010.06.19
Odds: -300 (Moderate Favorite) Upset Defeat | Disclosed Pay: $13,000 Base | Weigh-In: 186.0 lbs (84.4 kgs) | Referee: Josh Rosenthal
#30 Best MMA Knockout of the Year 2010
The Ultimate Fighter 11 Finale Knockout of the Night
Win | Decision | Split
3 Rounds, 15:00 Total

Tom Lawlor
7-0-0 6-1-0

UFC Fight Night 20: Maynard vs Diaz
Main Card | Middleweight | 185 lbs

2010.01.11
Odds: -295 (Moderate Favorite) | Disclosed Pay: $52,000 ($11K Base, $11K Bonus, $30K Fight/Night) | Weigh-In: 185.0 lbs (83.9 kgs) | Referee: Kevin Mulhall
#47 Best MMA Fight of the Year for 2010
UFC Fight Night 20 Fight of the Night
Win | KO/TKO | Injury
0:17 Round 2 of 3, 5:17 Total

Ed Herman
6-0-0 16-7-0

UFC 102: Couture vs. Nogueira
Preliminary Card | Middleweight | 185 lbs

2009.08.29
Odds: -119 (Near Even) | Disclosed Pay: $18,000 ($9K Base, $9K Bonus) | Weigh-In: 185.0 lbs (83.9 kgs) | Referee: Yves Lavigne | Walkout Music: Social Distortion - Ring of Fire
Win | KO/TKO | Punches
1:40 Round 1 of 3

Tim McKenzie
5-0-0 12-5-0

UFC Fight Night 18: Condit vs. Kampmann
Preliminary Card | Middleweight | 185 lbs

2009.04.01
Odds: -203 (Moderate Favorite) | Disclosed Pay: $30,000 KO/Night | Weigh-In: 186.0 lbs (84.4 kgs) | Referee: Mario Yamasaki
UFC Fight Night 18 Knockout of the Night
Win | KO/TKO | Punch
0:18 Round 1 of 3

David Avellan
4-0-0 2-0-0

WEC 36: Faber vs Brown
Preliminary Card | Middleweight | 185 lbs

2008.11.05
Odds: -163 (Slight Favorite) | Disclosed Pay: $10,000 ($5K Base, $5K Bonus) | Weigh-In: 184.5 lbs (83.7 kgs) | Referee: Jorge Alonso
Win | KO/TKO | Punches

Travis Degraw

Mexico Regional

2008.05.31
Win | KO/TKO | Punches

Scott Dingman

Tuff-N-Uff

2008.02.01
Win | KO/TKO | Punches

Tim Coulson

Cayman Islands Regional

2007.10.05
Win | Submission | Choke

Billy Onlewski

Arizona Regional

2000.04.16

Aaron Simpson News View All

Several fighters are leaving one of the most high-profile MMA camps in the country. Myle... (22 days ago)
The already stacked UFC featherweight division just added another contender to its mix, a... (24 days ago)
Kimbo Slice fought Ken Shamrock on Friday night at Bellator 138, and regardless of how ri... (2 months ago)
On June 19, Bellator will try to get itself back into the consciousness of MMA fans by pr... (2 months ago)
Has Cain Velasquez's beacon of championship greatness been extinguished after losing to F... (2 months ago)
Everyone has an opinion about Conor McGregor. Mike Miller of NBA's Cleveland Cavaliers t... (3 months ago)
  • MMA Junkie : Patricky 'Pitbull' plans to beat Awad, go after 'needy child' and 'clown' Will Brooks
  • MMA Junkie : Bellator 141 weigh-in results: Melvin Guillard and Brandon Girtz on weight for main event
  • MMA Weekly : Jason High Wants Referees and Athletic Commissions Held Accountable, Just Like Fighters
  • MMA Junkie : Carmont vs. Lins set for 'Bellator 142: Dynamite' tournament alternate bout
  • MMA Weekly : Derek Anderson on Brent Primus: ‘He’s Not Ready for Me’
  • MMA Weekly : Brent Primus on Derek Anderson: He Won’t Last Past the First Round
  • MMAFighting.com : Bellator 141 weigh-in video
  • MMA Junkie : UFC 191 headliner Demetrious Johnson: Only 'uneducated fools' say I'm 'boring'
  • MMAFighting.com : Demetrious Johnson is done listening to MMA's ‘uneducated fools'
  • MMA Junkie : Legacy FC 44 weigh-in results: Three miss weight but main event fighters on point
  • Middle Easy : A random Bellator fighter said Fedor hasn’t lost any quickness in retirement, we want to believe him
  • MMA Weekly : UFC 191: Johnson vs. Dodson 2 Media Conference Call Replay
  • MMA Weekly : Watch the Bellator 141: Guillard vs. Girtz Weigh-in, Thursday at 8p ET
  • MMA Junkie : Sarah Kaufman: It's 'almost impossible' to pick Holly Holm over Ronda Rousey
  • MMA Junkie : Melvin Guillard: I could have chosen UFC over Bellator, but went the ‘Money’ route
  • MMAFighting.com : Rousey vs. Correia looks to have topped 900,000 pay-per-view buys
  • MMA Junkie : Champ Patricio 'Pitbull' expects reinvented brother Patricky at Bellator 141
  • MMA Weekly : Knockout Radio LIVE: Tito Ortiz, Melvin Guillard, Kamaru Usman, and Antonio Tarver
  • MMA Junkie : Twitter Mailbag: On disappearing title shots and the Rousey-Mayweather 'feud' that must stop
  • Middle Easy : New Alistair Overeem vs. Junior dos Santos trailer will bring you to just the right level of heavyweight hype