| No. | Class | Team | Drivers | Car | Engine | Tyres | Fuel | |
|---|---|---|---|---|---|---|---|---|
| 1 | 0 | P | DeltaWing Racing | Sean Rayhall Katherine Legge Andreas Wirth Andy Meyrick | DeltaWing DWC13 | Elan | C | E10 |
| 2 | 1 | P | Tequila Patron ESM | Scott Sharp Ed Brown Johannes van Overbeek Pipo Derani | Liger JS P2 | Honda | C | E10 |
| 3 | 5 | P | Action Express Racing | João Barbosa Christian Fittipaldi Filipe Albuquerque Scott Pruett | Corvette DP | Chevrolet | C | E10 |
| 4 | 10 | P | Wayne Taylor Racing | Jordan Taylor Ricky Taylor Max Angelelli | Corvette DP | Chevrolet | C | E10 |
| 5 | 31 | P | Action Express Racing | Eric Curran Dane Cameron Simon Pagenaud Jonny Adam | Corvette DP | Chevrolet | C | E10 |
| 6 | 37 | P | SMP Racing | Maurizio Mediani Nicolas Minassian Mikhail Aleshin Kirill Ladygin | BR01 | Nissan | C | E10 |
| 7 | 50 | P | Highway To Help | Jim Pace Bryon DeFoor David Hinton Dorsey Schroeder Thomas Gruber | Riley DP | BMW Power | C | E10 |
| 8 | 55 | P | SpeedSource | Jonathan Bomarito Tristan Nunez Spencer Pigot | Mazda | Mazda (Petrol) | C | E10 |
| 9 | 60 | P | Michael Shank Racing | John Pew Ozz Negri Jr AJ Allmendinger Olivier Pla | Ligier JS PS2 | Honda HPD | C | E10 |
| 10 | 70 | P | SpeedSource | Joel Miller Tom Long Ben Devlin | Mazda | Mazda (Petrol) | C | E10 |
| 11 | 90 | P | VisitFlorida.com Racing | Ryan Dalziel Marc Goossens Ryan Hunter-Reay | Corvette DP | Chevrolet | C | E10 |
| 12 | 01 | P | Chip Ganassi Racing | Alex Wurz Andy Priaulx Brendon Hartley Lance Stroll | Riley DP | Ford EcoBoost | C | E10 |
| 13 | 02 | P | Chip Ganassi Racing | Scott Dixon Tony Kanaan Kyle Larson Jamie McMurray | Riley DP | Ford EcoBoost | C | E10 |
| 14 | 8 | PC | Starworks Motorsport | Jack Hawksworth Renger van der Zande Alex Popow Chris Cumming | ORECA FLM09 | Chevrolet | C | E10 |
| 15 | 20 | PC | BAR1 Motorsports | Johnny Mowlem Marc Drumwright Tony Drissi | ORECA FLM09 | Chevrolet | C | E10 |
| 16 | 26 | PC | BAR1 Motorsports | Adam Merzon Ryan Eversley Don Yount Ryan Lewis John Falb | ORECA FLM09 | Chevrolet | C | E10 |
| 17 | 38 | PC | Performance Tech Motorsports | James French Josh Norman Jim Norman Brandon Gdovic | ORECA FLM09 | Chevrolet | C | E10 |
| 18 | 52 | PC | PR1/Mathiasen Motorsports | Robert Alon Tom Kimber-Smith Jose Gutierrez Nicholas Boulle | ORECA FLM09 | Chevrolet | C | E10 |
| 19 | 54 | PC | CORE autosport | Jon Bennett Colin Braun Mark Wilkins Martin Plowman | ORECA FLM09 | Chevrolet | C | E10 |
| 20 | 85 | PC | JDC/Miller Motorsports | Mikhail Goikhberg Chris Miller Stephen Simpson Kenton Koch | ORECA FLM09 | Chevrolet | C | E10 |
| 21 | 88 | PC | Starworks | Mark Kvamme Sean Johnston Maro Engel Felix Rosenqvist | ORECA FLM09 | Chevrolet | C | E10 |
| 22 | 3 | GTLM | Corvette Racing | Jan Magnussen Antonio Garcia Mike Rockenfeller | Chevrolet Corvette C7.R | Chevrolet | M | E20C |
| 23 | 4 | GTLM | Corvette Racing | Oliver Gavin Tommy Milner Marcel Fassler | Chevrolet Corvette C7.R | Chevrolet | M | E20C |
| 24 | 25 | GTLM | BMW Team RLL | Bill Auberlen Dirk Werner Augusto Farfus Bruno Spengler | BMW M6 GTLM | BMW | M | E20C |
| 25 | 62 | GTLM | Risi Competizione | Giancarlo Fisichella Toni Vilander Davide Rigon Olivier Beretta | Ferrari 488 GTE | Ferrari | M | E20C |
| 26 | 66 | GTLM | Ford Chip Ganassi Racing | Joey Hand Dirk Muller Sebastien Bourdais | Ford GT | Ford Ecoboost | M | E20C |
| 27 | 67 | GTLM | Ford Chip Ganassi Racing | Ryan Briscoe Richard Westbrook Stefan Muecke | Ford GT | Ford Ecoboost | M | E20C |
| 28 | 68 | GTLM | Scuderia Corsa | Alessandro Pier Guidi Alexander Premat Daniel Serra Memo Rojas | Ferrari 488 GTE | Ferrari | M | E20C |
| 29 | 72 | GTLM | SMP Racing | Gianmaria Bruni James Calado Viktor Shaytar Andrea Bertolini | Ferrari 488 GTE | Ferrari | M | E20C |
| 30 | 100 | GTLM | BMW Team RLL | John Edwards Lucas Luhr Kuno Wittmer Graham Rahal | BMW M6 GTLM | BMW | M | E20C |
| 31 | 911 | GTLM | Porsche North America | Nick Tandy Patrick Pilet Kevin Estre | Porsche 911 RSR | Porsche | M | E20C |
| 32 | 912 | GTLM | Porsche North America | Earl Bamber Frédéric Makowiecki Michael Christensen | Porsche 911 RSR | Porsche | M | E20C |
| 33 | 6 | GTD | Stevenson Motorsports | Andrew Davis Robin Liddell Lawson Aschenbach Matt Bell | Audi R8 LMS GT3 | Audi | C | E10 |
| 34 | 9 | GTD | Stevenson Motorsports | Henry Habul Boris Said Dion von Moltke Tristan Vautier | Audi R8 LMS GT3 | Audi | C | E10 |
| 35 | 11 | GTD | O'Gara Motorsport | Townsend Bell Bill Sweedler Edoardo Piscopo Richard Antinucci | Lamborghini Huracan GT3 | Lamborghini | C | E10 |
| 36 | 16 | GTD | Change Racing | Spencer Pumpelly Corey Lewis Justin Marks Kaz Grala | Lamborghini Huracan GT3 | Lamborghini | C | E10 |
| 37 | 21 | GTD | Konrad Motorsport | Emanuele Busnelli Jim Michaelian | Lamborghini Huracan GT3 | Lamborghini | C | E10 |
| 38 | 22 | GTD | Alex Job Racing | David Macneil Cooper MacNeill Leh Keen Gunnar Jeannette Shane van Gisbergen | Porsche 991 GT3 R | Porsche | C | E10 |
| 39 | 23 | GTD | Team Seattle/Alex Job Racing | Ian James Mario Farnbacher Alex Riberas Wolf Henzler | Porsche 991 GT3 R | Porsche | C | E10 |
| 40 | 28 | GTD | Konrad Motorsport | Marc Basseng Fabio Babini Lance Willsey Franz Konrad Rolf Ineichen | Lamborghini Huracan GT3 | Lamborghini | C | E10 |
| 41 | 30 | GTD | Frikadelli Racing | Sabine Schmitz Klaus Ableben Patrick Huisman Frank Stippler Sven Muller | Porsche 991 GT3 R | Porsche | C | E10 |
| 42 | 33 | GTD | Riley Motorsports | Ben Keating Jeroen Bleekemolen Dominik Farnbacher Marc Miller | Dodge Viper SRT | Viper V10 | C | E10 |
| 43 | 44 | GTD | Magnus Racing | John Potter Andy Lally Marco Seefried Rene Rast | Audi R8 LMS GT3 | Audi | C | E10 |
| 44 | 45 | GTD | Flying Lizard Motorsports With Krohn Racing | Nic Jonsson Tracy Krohn Christopher Haase Pierre Kaffer | Audi R8 LMS | Audi | C | E10 |
| 45 | 48 | GTD | Paul Miller Racing | Mirko Bortolotti Bryce Miller Bryan Sellers Madison Snow | Lamborghini Huracan GT3 | Lamborghini | C | E10 |
| 46 | 51 | GTD | Spirit of Race | Peter Mann Marco Cioci Matteo Cressoni Raffaele Gianmaria | Ferrari 458 Italia | Ferrari | C | E10 |
| 47 | 63 | GTD | Scuderia Corsa | Christina Nielsen Alessandro Balzan Robert Renauer Jeff Segal | Ferrari 488 GT3 | Ferrari | C | E10 |
| 48 | 73 | GTD | Park Place Motorsports | Patrick Lindsey Matt McMurry Jörg Bergmeister Norbert Siedler | Porsche 911 GT3 R | Porsche | C | E10 |
| 49 | 93 | GTD | Riley Motorsports | Ben Keating Damien Faulkner Gar Robinson Jeff Mosing Eric Foss | Dodge Viper SRT | Dodge | C | E10 |
| 50 | 96 | GTD | Turner Motorsport | Bret Curtis Jens Klingmann Ashley Freiberg Marco Wittmann | BMW M6 GT3 | BMW | C | E10 |
| 51 | 97 | GTD | Turner Motorsport | Michael Marsal Markus Palttala Maxime Martin Jesse Krohn | BMW M6 GT3 | BMW | C | E10 |
| 52 | 98 | GTD | Aston Martin Racing | Paul Dalla Lana Pedro Lamy Mathias Lauda Richie Stanaway | Aston Martin V12 Vantage | Aston Martin | C | E10 |
| 53 | 007 | GTD | TRG-AMR | Santiago Creel Antonio Perez Ricardo Perez de Lara Sergio Perez Lars Vilijoen | Aston Martin V12 Vantage | Aston Martin | C | E10 |
| 54 | 540 | GTD | Black Swan Racing | Tim Pappas Nicky Catsburg Patrick Long Andy Pilgrim | Porsche 991 GT3 R | Porsche | C | E10 |
