| 01 | Bourdais / van der Zande / Dixon | Cadillac Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 02 | Bamber / Hunter-Reay / Lynn | Cadillac Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 1 | Snow / Sellers / Johansson | Paul Miller Racing (USA) | | BMW | M4 | G82 GT3 | BMW | GTD |
| 3 | Garcia / Catsburg / Taylor | Corvette Racing (USA) | | Chevrolet | Corvette C8 | .R GTD | Chevrolet | GTD Pro |
| 5 | Vautier / Duval / Westbrook | JDC Miller MotorSports (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 8 | Farano / Deletraz / Pinto de Andrade | Tower Motorsport | | Oreca | 07 | | Gibson | LMP2 |
| 9 | Nasr / Campbell / Jaminet | Pfaff Motorsports (CDN) | | Porsche | 991 GT3 R | | Porsche | GTD Pro |
| 10 | Taylor / Albuquerque / Hartley | Konica Minolta Acura ARX-05 (USA) | Wayne Taylor | Acura | ARX-05 | | Acura | DPi |
| 11 | Thomas / Nunez / Pierson | PR1 Mathiasen Motorsports | | Oreca | 07 | | Gibson | LMP2 |
| 12 | Heistand / Telitz / Montecalvo | VasserSullivan (USA) | | Lexus | RC F | GT3 | Lexus | GTD |
| 13 | Fidani / Bell / Kern | AWA (CDN) | Andrew Wojteczko | Duqueine | D08 | | Nissan | LMP3 |
| 14 | Hawksworth / Barnicoat / Kirkwood | VasserSullivan (USA) | | Lexus | RC F | GT3 | Lexus | GTD Pro |
| 16 | Robichon / Heylen / Hardwick | Wright Motorsports | | Porsche | 991 GT3 R | | Porsche | GTD |
| 18 | Merriman / Rasmussen / Dalziel | Era Motorsport | | Oreca | 07 | | Gibson | LMP2 |
| 20 | Andersen / Fjordbach / Scherer | High Class Racing | | Oreca | 07 | | Gibson | LMP2 |
| 21 | Mann / Vilander / Pérez Companc | AF Corse (I) | Amato Ferrari | Ferrari | 488 | GT3 | Ferrari | GTD |
| 23 | Riberas / Gunn / Gamble | Heart of Racing Team (USA) | Ian James | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD Pro |
| 25 | Krohn / De Phillippi / Edwards | BMW M Team RLL (USA) | | BMW | M4 | G82 GT3 | BMW | GTD Pro |
| 27 | de Angelis / Martin / James | Heart of Racing Team (USA) | Ian James | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD |
| 30 | Balogh / Grist / Siegel | Jr III Racing | | Ligier | JS P320 | | Nissan | LMP3 |
| 31 | Derani / Pla / Conway | Whelen Engineering Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 32 | McAleer / Müller / Skeen | Team Korthoff Motorsports | | Mercedes-AMG | GT3 | Evo | Mercedes-AMG | GTD |
| 33 | Jakobsen / Pino / Barbosa | Sean Creech Motorsport | | Ligier | JS P320 | | Nissan | LMP3 |
| 36 | Andretti / Chaves / Burdon | Andretti Autosport (USA) | Michael Andretti | Ligier | JS P320 | | Nissan | LMP3 |
| 38 | Goldburg / Maxson / Shields | Performance Tech Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 39 | Megennis / *Westphal / *Lewis | CarBahn with Peregrine Racing (USA) | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 42 | Conwright / Holzer / Yount | NTE/SSR (USA) | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 44 | Potter / *Pumpelly / *Lally | Magnus Racing (USA) | John Potter | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD |
| 47 | Sernagiotto / de Pauw / Lacorte | Cetilar Racing (I) | | Ferrari | 488 | GT3 | Ferrari | GTD |
| 48 | Kobayashi / Rockenfeller / Johnson | Ally Cadillac (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 52 | Keating / *Jensen / *Huffaker | PR1 Mathiasen Motorsports (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 54 | Bennett / Braun / Kurtz | CORE Autosport | | Ligier | JS P320 | | Nissan | LMP3 |
| 57 | Ward / Ellis / Dienst | Winward Racing (USA) | | Mercedes-AMG | GT3 | Evo | Mercedes-AMG | GTD |
| 60 | Blomqvist / Castroneves / Jarvis | Meyer Shank Racing W/Curb-Agajanian (USA) | Michael Shank | Acura | ARX-05 | | Acura | DPi |
| 62 | Calado / Serra / Rigon | Risi Competizione | | Ferrari | 488 | GT3 | Ferrari | GTD Pro |
| 66 | Bechtolsheimer / Farnbacher / Simpson | Gradient Racing (USA) | | Acura | NSX | GT3 | Acura | GTD |
| 70 | Iribe / Pepper / Priaulx | Inception Racing (GB) | | McLaren | 720S | GT3 | McLaren | GTD |
| 74 | van Berlo / Fraga / Robinson | Riley Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 76 | Mantella / Marcelli / Sarchet | AWA (CDN) | Andrew Wojteczko | Duqueine | D08 | | Nissan | LMP3 |
| 79 | Buhk / Götz / Grenier | WeatherTech Racing (USA) | | Mercedes-AMG | GT3 | Evo | Mercedes-AMG | GTD Pro |
| 81 | Hedman / Montoya / Montoya | DragonSpeed USA (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 96 | Foley / Auberlen / Dinan | Turner Motorsport (USA) | | BMW | M4 | G82 GT3 | BMW | GTD |
| 99 | Boulle / Ferriol / Legge | Team Hardpoint | | Porsche | 991 GT3 R | | Porsche | GTD |