| No. | Class | Team | Notes |
|---|---|---|---|
| 01 | GTP | Cadillac Racing | |
| 5 | GTP | JDC Miller Motorsports | |
| 6 | GTP | Porsche Penske Motorsports | |
| 7 | GTP | Porsche Penske Motorsports | |
| 10 | GTP | Wayne Taylor Racing with Andretti Autosport | |
| 24 | GTP | BMW M Team RLL | |
| 25 | GTP | BMW M Team RLL | |
| 31 | GTP | Whelen Engineering Cadillac Racing | |
| 40 | GTP | Wayne Taylor Racing with Andretti Autosport | |
| 59 | GTP | Proton Competition | |
| 63 | GTP | Iron Lynx | Select endurance events only |
| 2 | LMP2 | United Autosports USA | |
| 04 | LMP2 | CrowdStrike by APR | |
| 8 | LMP2 | Tower Motorsports | |
| 11 | LMP2 | TDS Racing | |
| 18 | LMP2 | Era Motorsport | |
| 20 | LMP2 | High Class Racing | |
| 22 | LMP2 | United Autosports USA | |
| 33 | LMP2 | Sean Creech Motorsport | |
| 52 | LMP2 | PR1 Mathiasen Motorsports | |
| 74 | LMP2 | Riley | |
| 88 | LMP2 | AF Corse | Select rounds only |
| 99 | LMP2 | AO Racing Team | |
| 1 | GTD Pro | Paul Miller Racing | |
| 3 | GTD Pro | Corvette Racing by Pratt Miller Motorsports | |
| 4 | GTD Pro | Corvette Racing by Pratt Miller Motorsports | |
| 9 | GTD Pro | Pfaff Motorsports | |
| 14 | GTD Pro | Vasser Sullivan | |
| 19 | GTD Pro | Iron Lynx | Select endurance events only |
| 23 | GTD Pro | Heart of Racing Team | |
| 62 | GTD Pro | Risi Competizione | Michelin Endurance Cup only |
| 64 | GTD Pro | Ford Multimatic Motorsports | |
| 65 | GTD Pro | Ford Multimatic Motorsports | |
| 75 | GTD Pro | Sun Energy 1 | Select endurance events only |
| 77 | GTD Pro | AO Racing Team | |
| 92 | GTD Pro | KellyMoss with Riley | |
| 12 | GTD | Vasser Sullivan | |
| 13 | GTD | AWA | |
| 17 | GTD | AWA | |
| 21 | GTD | AF Corse | Michelin Endurance Cup only |
| 023 | GTD | Triarsi Competizione | Michelin Endurance Cup only |
| 27 | GTD | Heart of Racing Team | |
| 32 | GTD | Korthoff Preston Motorsports | |
| 34 | GTD | Conquest Racing | |
| 43 | GTD | Andretti Motorsports | |
| 44 | GTD | Magnus Racing | |
| 45 | GTD | WTRAndretti | |
| 47 | GTD | Cetilar Racing | Michelin Endurance Cup only |
| 57 | GTD | Winward Racing | |
| 60 | GTD | Iron Lynx | Select endurance events only |
| 66 | GTD | Gradient Racing | |
| 70 | GTD | Inception Racing | |
| 78 | GTD | Forte Racing | |
| 83 | GTD | Iron Dames | Michelin Endurance Cup only |
| 86 | GTD | MDK Motorsports | |
| 91 | GTD | KellyMoss with Riley | |
| 96 | GTD | Turner Motorsport | |
| 120 | GTD | Wright Motorsport |
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