Aaron Simpson, a seasoned mixed martial artist, competed with a record of 12-5-0 and held a weight class of 170 lbs. during his UFC career, where he demonstrated a commendable 7-4-0 record. Standing at 6' 0', Simpson boasted a reach of 73', adopting an orthodox stance in the ring. In terms of performance statistics, Simpson averaged 3.6 significant strikes per minute and maintained a striking accuracy of 52%. He absorbed an average of 2.53 strikes per minute, showcasing a strike defense of 56%. Simpson also demonstrated impressive takedown abilities, averaging 3.78 takedowns per 15 minutes with a takedown accuracy of 34%. Notable victories in his career include defeating Tom Lawlor, who held an ELO rating of 1038. In his most recent fights, Simpson won against Brad Tavares and Eric Schafer via unanimous decision, lost to Ronny Markes by split decision, secured another win against Kenny Robertson, and suffered a knockout loss against Mike Pierce in October 2012.
| Date | Event | Opponent | Method | Round | Time | Result |
|---|---|---|---|---|---|---|
| 2012-10-05 | UFC on FX: Browne vs Bigfoot | Mike Pierce | KO/TKO Punch | 2 | 0:29 | Loss |
| 2012-07-11 | UFC on FUEL TV: Munoz vs Weidman | Kenny Robertson | U-DEC | 3 | 5:00 | Win |
| 2012-02-15 | UFC on FUEL TV: Sanchez vs Ellenberger | Ronny Markes | S-DEC | 3 | 5:00 | Loss |
| 2011-10-08 | UFC 136: Edgar vs Maynard 3 | Eric Schafer | U-DEC | 3 | 5:00 | Win |
| 2011-07-02 | UFC 132: Cruz vs Faber | Brad Tavares | U-DEC | 3 | 5:00 | Win |
| 2011-03-26 | UFC Fight Night: Nogueira vs Davis | Mario Miranda | U-DEC | 3 | 5:00 | Win |
| 2010-11-20 | UFC 123: Rampage vs Machida | Mark Munoz | U-DEC | 3 | 5:00 | Loss |
| 2010-06-19 | The Ultimate Fighter: Team Liddell vs Team Ortiz Finale | Chris Leben | KO/TKO Punches | 2 | 4:17 | Loss |
| 2010-01-11 | UFC Fight Night: Maynard vs Diaz | Tom Lawlor | S-DEC | 3 | 5:00 | Win |
| 2009-08-29 | UFC 102: Couture vs Nogueira | Ed Herman | KO/TKO | 2 | 0:17 | Win |
| 2009-04-01 | UFC Fight Night: Condit vs Kampmann | Tim McKenzie | KO/TKO Punches | 1 | 1:40 | Win |
| Fight # | Date | Opponent Name | Opponent ELO | Result | ELO Gained | ELO |
|---|---|---|---|---|---|---|
| 11 | 2012-10-05 | Mike Pierce | 1076 | Loss | -16 | 1053 |
| 10 | 2012-07-11 | Kenny Robertson | 986 | Win | +13 | 1069 |
| 9 | 2012-02-15 | Ronny Markes | 1016 | Loss | 0 | 1056 |
| 8 | 2011-10-08 | Eric Schafer | 1002 | Win | +14 | 1056 |
| 7 | 2011-07-02 | Brad Tavares | 1035 | Win | +16 | 1042 |
| 6 | 2011-03-26 | Mario Miranda | 996 | Win | +15 | 1026 |
| 5 | 2010-11-20 | Mark Munoz | 1032 | Loss | -16 | 1011 |
| 4 | 2010-06-19 | Chris Leben | 1054 | Loss | -15 | 1027 |
| 3 | 2010-01-11 | Tom Lawlor | 1038 | Win | 0 | 1042 |
| 2 | 2009-08-29 | Ed Herman | 1031 | Win | +21 | 1042 |
| 1 | 2009-04-01 | Tim McKenzie | 1000 | Win | +21 | 1021 |