| No. | Class | T | Fuel | Team | Driver | Car | |
|---|---|---|---|---|---|---|---|
| 1 | 6 | P1 | M | E-10 | Muscle Milk Pickett Racing | Klaus Graf Lucas Luhr | HPD ARX-03a Honda |
| 2 | 16 | P1 | M | Isobutanol | Dyson Racing Team Inc. | Guy Smith Johnny Mowlem | Lola B12/60 Mazda |
| 3 | 0 | P1 | B | E-10 | DeltaWing Racing Cars | Andy Meyrick Katherine Legge | DeltaWing LM12 |
| 4 | 01 | P2 | M | E-10 | Extreme Speed Motorsports | Scott Sharp Anthony Lazzaro | HPD ARX-03b Honda |
| 5 | 02 | P2 | M | E-10 | Extreme Speed Motorsports | Ed Brown Johannes van Overbeek | HPD ARX-03b Honda |
| 6 | 551 | P2 | M | E-10 | Level 5 Motorsports | Scott Tucker Ryan Briscoe | HPD ARX-03b Honda |
| 7 | 552 | P2 | M | E-10 | Level 5 Motorsports | Scott Tucker Marino Franchitti Guy Cosmo | HPD ARX-03b Honda |
| 8 | 3 | GT | M | E-85 | Corvette Racing | Jan Magnussen Antonio Garcia | Chevrolet Corvette C6 ZR1 |
| 9 | 4 | GT | M | E-85 | Corvette Racing | Oliver Gavin Tommy Milner | Chevrolet Corvette C6 ZR1 |
| 10 | 17 | GT | F | E-85 | Team Falken Tire | Wolf Henzler Bryan Sellers | Porsche 997 GT3 RSR |
| 11 | 23 | GT | Y | E-85 | Team West/AJR/Boardwalk Ferrari | Bill Sweedler Townsend Bell | Ferrari F458 Italia |
| 12 | 48 | GT | M | E-85 | Paul Miller Racing | Bryce Miller Marco Holzer | Porsche 911 GT3 RSR |
| 13 | 55 | GT | M | E-85 | BMW Team RLL | Bill Auberlen Maxime Martin | BMW Z4 GTE |
| 14 | 56 | GT | M | E-85 | BMW Team RLL | Dirk Müller Joey Hand | BMW Z4 GTE |
| 15 | 62 | GT | M | E-85 | Risi Competizione | Olivier Beretta Matteo Malucelli | Ferrari F458 Italia |
| 16 | 91 | GT | M | E-85 | SRT Motorsports | Dominik Farnbacher Marc Goossens | SRT Viper GTSR |
| 17 | 93 | GT | M | E-85 | SRT Motorsports | Jonathan Bomarito Kuno Wittmer | SRT Viper GTSR |
| 18 | 06 | GT | M | E-85 | CORE autosport | Pat Long Colin Braun | Porsche 911 GT3 RSR |
| 19 | 5 | PC | C | E-10 | Starworks Motorsport | Ryan Dalziel John Pew | Oreca FLM09 |
| 20 | 7 | PC | C | E-10 | BAR1 Motorsports | Rusty Mitchell James French | Oreca FLM09 |
| 21 | 8 | PC | C | E-10 | BAR1 Motorsports | Kyle Marcelli Chris Cumming | Oreca FLM09 |
| 22 | 18 | PC | C | E-10 | Performance Tech Motorsports | Tristan Nunez Ryan Booth | Oreca FLM09 |
| 23 | 52 | PC | C | E-10 | PR1 Mathiasen Motorsports | Mike Guasch David Cheng | Oreca FLM09 |
| 24 | 81 | PC | C | E-10 | DragonSpeed Mishumotors | Mirco Schultis Renger van der Zande | Oreca FLM09 |
| 25 | 05 | PC | C | E-10 | CORE Autosport | Jonathan Bennett Tom Kimber-Smith | Oreca FLM09 |
| 26 | 11 | GTC | Y | E-10 | JDX Racing | Mike Hedlund Jan Heylen | Porsche 911 GT3 Cup |
| 27 | 22 | GTC | Y | E-10 | Alex Job Racing | Cooper MacNeil Jeroen Bleekemolen | Porsche 911 GT3 Cup |
| 28 | 27 | GTC | Y | E-10 | Dempsey Del Piero Racing | Patrick Dempsey Andy Lally | Porsche 911 GT3 Cup |
| 29 | 30 | GTC | Y | E-10 | NGT Motorsport | Henrique Cisneros Sean Edwards | Porsche 911 GT3 Cup |
| 30 | 31 | GTC | Y | E-10 | NGT Motorsport | Eduardo Cisneros Kuba Giermaziak | Porsche 911 GT3 Cup |
| 31 | 44 | GTC | Y | E-10 | Flying Lizard Motorsports | Seth Neiman Dion von Moltke | Porsche 911 GT3 Cup |
| 32 | 45 | GTC | Y | E-10 | Flying Lizard Motorsports | Nelson Canache Jr. Spencer Pumpelly | Porsche 911 GT3 Cup |
| 33 | 66 | GTC | Y | E-10 | TRG | Ben Keating Damien Faulkner | Porsche 911 GT3 Cup |
