| 01 | Cadillac DPi-V.R | Cadillac Racing | black/grey (+red/white) | CADILLAC V-PERFORMANCE ACADEMY | Michelin | closed | mid |
| 02 | Cadillac DPi-V.R | Cadillac Racing | black/red (+grey/white) | CADILLAC ACCESSORIES | Michelin | closed | mid |
| 2 | Porsche 991 GT3 R | KCMG | blue/white/black | KC MOTORGROUP | Michelin | closed | rear |
| 3 | Chevrolet Corvette C8.R GTD | Corvette Racing | yellow/grey | Mobil 1/Sirius XM | Michelin | closed | mid |
| 4 | Chevrolet Corvette C8.R GTD | Corvette Racing | grey/yellow | Mobil 1/Sirius XM | Michelin | closed | mid |
| 5 | Cadillac DPi-V.R | JDC Miller MotorSports | grey/gold (+black/white) | Mustang Sampling/galp | Michelin | closed | mid |
| 6 | Duqueine D08 Nissan | Muehlner Motorsports America | blue/white | H&R | Michelin | closed | mid |
| 7 | Duqueine D08 Nissan | Forty7 Motorsports | grey/blue | DUZY/Drive Capital | Michelin | closed | mid |
| 8 | Oreca 07 Gibson | Tower Motorsport | black/orange/white | TOWER EVENTS | Michelin | closed | mid |
| 9 | Porsche 991 GT3 R | Pfaff Motorsports | red/silver/grey | MOTUL/Porsche Centre Markham | Michelin | closed | rear |
| 10 | Acura ARX-05 | Konica Minolta Acura ARX-05 | blue/black (+silver) | KONICA MINOLTA/ACURA | Michelin | closed | mid |
| 11 | Oreca 07 Gibson | PR1 Mathiasen Motorsports | grey/blue (+yellow) | FEAR THE TAFS/#ENDALZ/RACE FOR RP | Michelin | closed | mid |
| 12 | Lexus RC F GT3 | VasserSullivan | yellow/black | SealMaster/mark levinson/molex | Michelin | closed | front |
| 13 | Duqueine D08 Nissan | AWA | yellow/black (+red) | ORLANDOCORP.COM/SONIC | Michelin | closed | mid |
| 14 | Lexus RC F GT3 | VasserSullivan | yellow/black | SealMaster/mark levinson/molex | Michelin | closed | front |
| 15 | Mercedes-AMG GT3 | Proton USA | white (+red/blue) | WeatherTech | Michelin | closed | front |
| 16 | Porsche 991 GT3 R | Wright Motorsports | blue/black (+white) | 1st phorm/MOUNTAIN MOTORSPORTS/UNA VIDA | Michelin | closed | rear |
| 18 | Oreca 07 Gibson | Era Motorsport | blue/grey/white | MECHANIX WEAR/CONTROL | Michelin | closed | mid |
| 19 | Lamborghini Huracán GT3 | TR3 Racing | red | PILOTI/LAMBORGHINI MIAMI | Michelin | closed | mid |
| 20 | Oreca 07 Gibson | High Class Racing | red/white/black | polar handtools/MASCOT WORKWEAR/STOBAG | Michelin | closed | mid |
| 21 | Ferrari 488 GT3 | AF Corse | red (+white) | rotiform | Michelin | closed | mid |
| 22 | Oreca 07 Gibson | United Autosports | blue/red | AERO/HRX/Maria Mallaband/attis | Michelin | closed | mid |
| 23 | Aston Martin Vantage GT3 | Heart of Racing Team | blue (+yellow) | THE HEART OF RACING | Michelin | closed | front |
| 24 | BMW M4 GT3 | BMW M Team RLL | black/white/blue/red | MOTUL/BMW of North America/H&R/Global Medical Response | Michelin | closed | front |
| 25 | BMW M4 GT3 | BMW M Team RLL | red/black/white/grey | MOTUL/BMW of North America/H&R/Global Medical Response | Michelin | closed | front |
| 26 | Duqueine D08 Nissan | Muehlner Motorsports America | blue/white | H&R | Michelin | closed | mid |
| 27 | Aston Martin Vantage GT3 | Heart of Racing Team | blue (+yellow) | THE HEART OF RACING | Michelin | closed | front |
| 28 | Mercedes-AMG GT3 | Alegra Motorsports | red/grey/white (+yellow) | NAVISEC | Michelin | closed | front |
| 29 | Oreca 07 Gibson | Racing Team Nederland | yellow/black | JUMBO/VAN WUNEN | Michelin | closed | mid |
| 31 | Cadillac DPi-V.R | Whelen Engineering Racing | red/white (+black) | WHELEN/LUCAS OIL/CORE/TEAMFOX | Michelin | closed | mid |
| 32 | Mercedes-AMG GT3 | Gilbert Korthoff Motorsports | silver/black (+blue) | Performance Driving Group | Michelin | closed | front |
| 33 | Ligier JS P320 Nissan | Sean Creech Motorsport | white/blue/red | Focal One/ALTA/EXELIXIS | Michelin | closed | mid |
| 34 | Porsche 991 GT3 R | GMG Racing | red/black (+white) | MOVO/CENTR/seaspan | Michelin | closed | rear |
| 36 | Ligier JS P320 Nissan | Andretti Autosport | grey/white (+green) | GALLANT/MI/Window World | Michelin | closed | mid |
| 38 | Ligier JS P320 Nissan | Performance Tech Motorsports | red/black/grey | CARDIO ACCESS/COPEC/emasa | Michelin | closed | mid |
| 39 | Lamborghini Huracán GT3 Evo | CarBahn with Peregrine Racing | grey/green/black | Optimizely/Accel/Menlo/AERO | Michelin | closed | mid |
| 42 | Lamborghini Huracán GT3 | NTE Sport | white | SOUTHWEST FUNDING/SSR | Michelin | closed | mid |
| 44 | Aston Martin Vantage GT3 | Magnus Racing | black (+green/white) | | Michelin | closed | front |
| 47 | Ferrari 488 GT3 | Cetilar Racing | blue (+green) | Cetilar | Michelin | closed | mid |
| 48 | Cadillac DPi-V.R | Ally Cadillac | white/purple/pink | ally/LUCAS OIL | Michelin | closed | mid |
| 52 | Oreca 07 Gibson | PR1 Mathiasen Motorsports | purple/pink/orange (+white) | wynn's/4HORSEMEN/rainX | Michelin | closed | mid |
| 54 | Ligier JS P320 Nissan | CORE Autosport | orange/white/blue/grey | FLEX-BOX/CROWDSTRIKE | Michelin | closed | mid |
| 57 | Mercedes-AMG GT3 | Winward Racing | white/blue/red | FIRST HORIZON/TECHEMET/Mobil 1 | Michelin | closed | front |
| 59 | McLaren 720S GT3 | Crucial Motorsports | orange | Belle Haven/JDRF/FIRM | Michelin | closed | mid |
| 60 | Acura ARX-05 | Meyer Shank Racing W/Curb-Agajanian | pink/blue/white | AutoNation/SiriusXM/ARCTIC WOLF | Michelin | closed | mid |
| 62 | Ferrari 488 GT3 | Risi Competizione | red | PENNZOIL/Ferrari of HOUSTON/1st Phorm/Rotiform | Michelin | closed | mid |
| 63 | Lamborghini Huracán GT3 | TR3 Racing | green | BIO-CIRCLE/LAMBORGHINI MIAMI/ | Michelin | closed | mid |
| 64 | Porsche 991 GT3 R | TeamTGM | blue/white/orange | JKTG FOUNDATION | Michelin | closed | rear |
| 66 | Acura NSX GT3 | Gradient Racing | blue/black/white | INVEST CAYMAN/UNIT NUTRITION/ACURA/HPD | Michelin | closed | mid |
| 68 | Oreca 07 Gibson | G-Drive Racing By APR | black/orange | E11EVEN/CARLAC MINERALS/PR electronics | Michelin | closed | mid |
| 69 | Oreca 07 Gibson | G-Drive Racing By APR | black/orange | ENTERVAL/RINGWOOD MAZDA/VAN DER HELM | Michelin | closed | mid |
| 70 | McLaren 720S GT3 | Inception Racing | black/red | Pedal Mafia/pyure/AVORAK/UNCOMMON SENSE | Michelin | closed | mid |
| 71 | Lamborghini Huracán GT3 | T3 Motorsport North America | black (+silver/yellow/red) | VALMIERA GLASS/Celebrity Cruises | Michelin | closed | mid |
| 74 | Ligier JS P320 Nissan | Riley Motorsports | blue/orange | 74 RANCH RESORT/MOTUL | Michelin | closed | mid |
| 75 | Mercedes-AMG GT3 | Sun Energy 1 | orange/blue | SUNENERGY1 | Michelin | closed | front |
| 79 | Porsche 991 GT3 R | WeatherTech Racing | white (+red/blue) | WeatherTech | Michelin | closed | rear |
| 81 | Oreca 07 Gibson | DragonSpeed USA | orange/yellow | Atmofizer/kimoa/JONES/Rembrandt Charms/Capstone | Michelin | closed | mid |
| 96 | BMW M4 GT3 | Turner Motorsport | white/red/blue | LIQUI MOLY/TURNER/H&R | Michelin | closed | front |
| 97 | Mercedes-AMG GT3 | WeatherTech Racing | white (+red/blue) | WeatherTech | Michelin | closed | front |
| 98 | Aston Martin Vantage GT3 | Northwest AMR | black/yellow/blue | NORTHWEST | Michelin | closed | front |
| 99 | Porsche 991 GT3 R | Team Hardpoint | white/red/black | GRIDRIVAL/GNARLY | Michelin | closed | rear |