| 01 | van der Zande / Bamber / Dixon | 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 / Gamble / Meyrick | United Autosports USA | | Ligier | JS P320 | | Nissan | LMP3 |
| 3 | Taylor / Garcia / Catsburg | Corvette Racing (USA) | | Chevrolet | Corvette C8 | .R | Chevrolet | GTLM |
| 4 | Tandy / Milner / Sims | 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 |
| 7 | Pflucker / Kvamme / Rzadzinski | Forty7 Motorsports | | Duqueine | D08 | | Nissan | LMP3 |
| 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 / Montecalvo / Megennis | 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 | Hindman / Long / Heylen | Wright Motorsports | | Porsche | 991 GT3 R | | Porsche | GTD |
| 18 | Merriman / Tilley / Dalziel | Era Motorsport | | Oreca | 07 | | Gibson | LMP2 |
| 19 | Goikhberg / Perera / Beretta | GRT Grasser Racing Team (A) | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 22 | McGuire / Boyd / Smith | United Autosports (USA) | Richard Dean/Zak Brown | Oreca | 07 | | Gibson | LMP2 |
| 23 | de Angelis / Gunn / James | 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 / Juncadella | Alegra Motorsports | | Mercedes-AMG | GT3 | Evo | Mercedes-AMG | GTD |
| 30 | Balogh / Grist / Pigot | JR III Racing | | Ligier | JS P320 | | Nissan | LMP3 |
| 31 | Nasr / Conway / Derani | Whelen Engineering Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 32 | Skeen / Cosmo / McAleer | Gilbert/Korthoff Motorsports | | Mercedes-AMG | GT3 | Evo | Mercedes-AMG | GTD |
| 36 | Andretti / Burdon / Askew | Andretti Autosport (USA) | Michael Andretti | Ligier | JS P320 | | Nissan | LMP3 |
| 38 | Goldburg / Lindh / Jakobsen | Performance Tech Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 40 | Archer / Vance / Hanratty | FastMD Racing | | Duqueine | D08 | | Nissan | LMP3 |
| 42 | Yount / Conwright / Hites | 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 |
| 57 | Ward / Ellis / Engel | Winward Racing (USA) | | Mercedes-AMG | GT3 | Evo | Mercedes-AMG | GTD |
| 60 | Cameron / Castroneves / Montoya | Meyer Shank Racing w/ Curb-Agajanian (USA) | Michael Shank | Acura | ARX-05 | | Acura | DPi |
| 70 | Iribe / Schandorff / Barnicoat | Inception Racing (GB) | | McLaren | 720S | GT3 | McLaren | GTD |
| 74 | Robinson / Fraga / Andrews | Riley Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 79 | MacNeil / Jaminet / Campbell | WeatherTech Racing (USA) | | Porsche | 991 RSR | II 19 | Porsche | GTLM |
| 83 | Bell / Rao / Skelton | WIN Autosport | | Duqueine | D08 | | 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 |
| 97 | Estre / Christensen / Makowiecki | WeatherTech Racing | | Porsche | 991 RSR | II 19 | Porsche | GTLM |