| 01 | van der Zande / Magnussen | Cadillac Chip Ganassi Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 1 | Sellers / Snow / Lewis | Paul Miller Racing (USA) | Paul Miller | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 2 | Krütten / Cauhaupe / McCusker | United Autosports USA | | Ligier | JS P320 | | Nissan | LMP3 |
| 3 | Taylor / Garcia | Corvette Racing (USA) | | Chevrolet | Corvette C8 | .R | Chevrolet | GTLM |
| 4 | Tandy / Milner | Corvette Racing (USA) | | Chevrolet | Corvette C8 | .R | Chevrolet | GTLM |
| 5 | Vautier / Duval / Bourdais | Mustang Sampling/JDC-Miller MotorSports (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 8 | Farano / Aubry / French | Tower Motorsport | | Oreca | 07 | | Gibson | LMP2 |
| 9 | Robichon / Vanthoor / Kern | Pfaff Motorsports (CDN) | | Porsche | 991 GT3 R | | Porsche | GTD |
| 10 | Taylor / Albuquerque / Rossi | Konica Minolta Acura (USA) | Wayne Taylor | Acura | ARX-05 | | Acura | DPi |
| 11 | Thomas / Nunez / Merrill | WIN Autosport | | Oreca | 07 | | Gibson | LMP2 |
| 12 | Veach / Megennis / Montecalvo | Vasser-Sullivan Racing (USA) | | Lexus | RC F | GT3 | Lexus | GTD |
| 14 | Telitz / Hawksworth / Kirkwood | Vasser-Sullivan Racing (USA) | | Lexus | RC F | GT3 | Lexus | GTD |
| 16 | Long / Heylen / Hindman | Wright Motorsports | | Porsche | 991 GT3 R | | Porsche | GTD |
| 18 | Merriman / Tilley / Dalziel | Era Motorsport (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 19 | Goikhberg / Perera / Zimmermann | GRT Grasser Racing Team (A) | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 22 | McGuire / Boyd / Smith | United Autosports | Richard Dean/Zak Brown | Oreca | 07 | | Gibson | LMP2 |
| 23 | James / de Angelis / Gunn | Heart of Racing Team (USA) | Ian James | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD |
| 24 | Farfus / Edwards / Krohn | BMW Team RLL (USA) | | BMW | M8 | GTE | BMW | GTLM |
| 25 | De Phillippi / Eng / Spengler | BMW Team RLL (USA) | | BMW | M8 | GTE | BMW | GTLM |
| 28 | Morad / de Quesada / Johnson | Alegra Motorsports | | Mercedes-AMG | GT3 | Evo | Mercedes-AMG | GTD |
| 31 | Nasr / Derani / Conway | Whelen Engineering Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 36 | Andretti / Askew / Andretti | Andretti Autosport (USA) | Michael Andretti | Ligier | JS P320 | | Nissan | LMP3 |
| 38 | Lindh / Goldburg / Llarena | Performance Tech Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 39 | Heistand / Westphal / McQuarrie | CarBahn with Peregrine Racing | | Audi | R8 LMS | GT3 | Audi | GTD |
| 42 | Yount / Conwright / Palttala | NTE Sport | | Audi | R8 LMS | GT3 | Audi | GTD |
| 44 | Potter / Lally / Pumpelly | Magnus Racing with Archangel Motorsports | | Acura | NSX | GT3 | Acura | GTD |
| 48 | Johnson / Kobayashi / Pagenaud | Ally Cadillac Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 52 | Keating / Jensen / Huffaker | PR1 Mathiasen Motorsports (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 54 | Bennett / Kurtz / Braun | Core Motorsport | | Ligier | JS P320 | | Nissan | LMP3 |
| 55 | Jarvis / Tincknell / Bomarito | Mazda Motorsports | | Mazda | RT24-P | | Mazda | DPi |
| 60 | Cameron / Pla | Meyer Shank Racing w/ Curb-Agajanian (USA) | Michael Shank | Acura | ARX-05 | | Acura | DPi |
| 74 | Robinson / Fraga / Andrews | Riley Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 75 | Habul / Engel / Grenier | SunEnergy1 Racing | | Mercedes-AMG | GT3 | Evo | Mercedes-AMG | GTD |
| 79 | MacNeil / Jaminet / Campbell | WeatherTech Racing (USA) | | Porsche | 991 RSR | II 19 | Porsche | GTLM |
| 84 | Olsen / Cicero / Devlin | Dawson Racing (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 88 | Ferriol / Legge / Davis | Team Hardpoint EBM | | Porsche | 991 GT3 R | | Porsche | GTD |
| 91 | Cox / Murry / Bleekemolen | Riley Motorsports | | Ligier | JS P320 | | Nissan | LMP3 |
| 96 | Auberlen / Foley / Read | Turner Motorsport | | BMW | M6 | F13 GT3 | BMW | GTD |