| 3 | Garcia / Taylor / Catsburg | Corvette Racing (USA) | | Chevrolet | Corvette C8 | .R | Chevrolet | GTLM |
| 4 | Gavin / Milner / Fässler | Corvette Racing (USA) | | Chevrolet | Corvette C8 | .R | Chevrolet | GTLM |
| 5 | Bourdais / Duval / Barbosa | Mustang Sampling Racing/JDC-Miller MotorSports (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 6 | Montoya / Cameron / Pagenaud | Acura Team Penske (USA) | Roger Penske | Acura | ARX-05 | | Acura | DPi |
| 7 | Castroneves / Taylor / Rossi | Acura Team Penske (USA) | Roger Penske | Acura | ARX-05 | | Acura | DPi |
| 8 | Dalziel / Heinemeier Hansson / Farano / Lapierre | Tower Motorsport by Starworks (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 9 | Olsen / Robichon / Kern / Pilet | Pfaff Motorsports (CDN) | | Porsche | 991 GT3 R | | Porsche | GTD |
| 10 | van der Zande / Briscoe / Dixon / Kobayashi | Konica Minolta Cadillac DPi-V.R (USA) | Wayne Taylor | Cadillac | DPi-V.R | | Cadillac | DPi |
| 11 | Heistand / Schothorst / Perera / Costa | GRT Grasser Racing Team | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 12 | Montecalvo / Van Gisbergen / Telitz / Bell | AIM Vasser-Sullivan (USA) | | Lexus | RC F | GT3 | Lexus | GTD |
| 14 | Chase / Hawksworth / de Quesada / Busch | AIM Vasser-Sullivan | | Lexus | RC F | GT3 | Lexus | GTD |
| 16 | Hardwick / Long / Imperato / Bachler | Wright Motorsports | | Porsche | 991 GT3 R | | Porsche | GTD |
| 18 | Tilley / Merriman / Lewis / Minassian | Era Motorsport | | Oreca | 07 | | Gibson | LMP2 |
| 19 | Nielsen / Legge / Calderón / Frey | GEAR Racing powered by GRT Grasser (A) | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 23 | James / de Angelis / Thiim / Riberas | Heart of Racing Team (USA) | Ian James | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD |
| 24 | Farfus / Krohn / Edwards / Mostert | BMW Team RLL (USA) | | BMW | M8 | GTE | BMW | GTLM |
| 25 | Spengler / Eng / De Phillippi / Herta | BMW Team RLL (USA) | | BMW | M8 | GTE | BMW | GTLM |
| 31 | Conway / Nasr / Derani / Albuquerque | Whelen Engineering Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 38 | Cassels / Masson / Masson / Yount | Performance Tech Motorsports | | Oreca | 07 | | Gibson | LMP2 |
| 44 | Lally / Potter / Pumpelly / Mapelli | GRT Magnus (USA) | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 47 | Gdovic / Lux / Kvamme / Hoggard | Precision Performance Motorsports (USA) | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 48 | Sellers / Snow / Lewis / Caldarelli | Paul Miller Racing (USA) | Paul Miller | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 52 | Keating / Trummer / Boulle / Aubry | PR1 Mathiasen Motorsports | | Oreca | 07 | | Gibson | LMP2 |
| 54 | Pappas / Bleekemolen / Müller / Estep | Black Swan Racing | | Porsche | 991 GT3 R | | Porsche | GTD |
| 55 | Bomarito / Tincknell / Hunter-Reay | Mazda Team Joest (D) | Reinhold Jöst | Mazda | RT24-P | | Mazda | DPi |
| 57 | Parente / Goikhberg / Hindman / Allmendinger | Heinricher Racing w/MSR Curb-Agajanian | | Acura | NSX | GT3 | Acura | GTD |
| 62 | Calado / Pier Guidi / Serra / Rigon | Risi Competizione (USA) | | Ferrari | 488 | GTE | Ferrari | GTLM |
| 63 | MacNeil / Vilander / Balzan / Westphal | Scuderia Corsa | | Ferrari | 488 | GT3 | Ferrari | GTD |
| 74 | Robinson / Aschenbach / Keating / Fraga | Riley Motorsports | | Mercedes-AMG | GT3 | | Mercedes-AMG | GTD |
| 77 | Jarvis / Nunez / Pla | Mazda Team Joest (D) | Reinhold Jöst | Mazda | RT24-P | | Mazda | DPi |
| 81 | Hanley / Hedman / Braun / Newey | DragonSpeed USA (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 85 | Piedrahita / Miller / Leist / Vautier | JDC-Miller MotorSports (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 86 | McMurry / Farnbacher / Michimi | Meyer Shank Racing w/ Curb-Agajanian (USA) | Michael Shank | Acura | NSX | GT3 | Acura | GTD |
| 88 | Bortolotti / Ineichen / Morad / Vanthoor | WRT Speedstar Audi Sport (B) | Vincent Vosse | Audi | R8 LMS | GT3 | Audi | GTD |
| 96 | Auberlen / Foley / Machavern / Klingmann | Turner Motorsport | | BMW | M6 | F13 GT3 | BMW | GTD |
| 98 | Lamy / Gunn / Lauda / Watson | Aston Martin Racing | | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD |
| 911 | Tandy / Makowiecki / Campbell | Porsche GT Team (USA) | | Porsche | 991 RSR | II 19 | Porsche | GTLM |
| 912 | Bamber / Vanthoor / Jaminet | Porsche GT Team (USA) | | Porsche | 991 RSR | II 19 | Porsche | GTLM |