2021 Circuit of the Americas
Entry list
| Car # | Driver 1 | Driver 2 | Team | Car | Class |
|---|---|---|---|---|---|
| 11 | Stevan McAleer | Toby Grahovec | Classic BMW | BMW M4 GT4 | SL |
| 22 | Tim Barber | Cole Ciraulo | CCR Racing/Team TFB | BMW M4 GT4 | SL |
| 38 | Nick Wittmer | Tomas Mejia | ST Racing | BMW M4 GT4 | SL |
| 062 | Ryan Dexter | Warren Dexter | Dexter Racing | Aston Martin Vantage AMR GT4 | SL |
| 71 | Nicolai Elghanayan | Mads Siljehaug | Marco Polo Motorsports | KTM X-bow | SL |
| 72 | Kenny Murillo | Christian Szymczak | Murillo Racing | Mercedes-AMG GT4 | SL |
| 94 | Jon Miller | Chandler Hull | BimmerWorld Racing | BMW M4 GT4 | SL |
| 888 | Vesko Kozarov | Jeff Westphal | Rearden Racing | Audi R8 LMS GT4 | SL |
| 00 | Matt Dalton | Patrick Gallagher | Notlad Racing by RS1 | Aston Martin Vantage AMR GT4 | PA |
| 2 | Jason Bell | Andrew Davis | GMG Racing | Aston Martin Vantage AMR GT4 | PA |
| 8 | Elias Sabo | Andy Lee | GMG Racing | Audi R8 LMS GT4 | PA |
| 15 | Bryan Putt | Kenton Koch | BSPort Racing | Aston Martin Vantage AMR GT4 | PA |
| 24 | Gray Newell | Ian James | Heart of Racing Team | Aston Martin Vantage AMR GT4 | PA |
| 28 | Joe Rubbo | Ryan Eversley | ST Racing | BMW M4 GT4 | PA |
| 29 | Dmitri Novikov | Owen Trinkler | Rearden Racing | Audi R8 LMS GT4 | PA |
| 34 | James Walker | Bill Auberlen | BimmerWorld Racing | BMW M4 GT4 | PA |
| 36 | James Clay | Nick Galante | BimmerWorld Racing | BMW M4 GT4 | PA |
| 39 | Chris Cagnazzi | Guy Cosmo | RENNtech Motorsports | Mercedes-AMG GT4 | PA |
| 47 | Matt Travis | Jason Hart | NOLASPORT | Porsche 718 Cayman GT4 CLUBSPORT MR | PA |
| 52 | Tom Capizzi | John Capestro-Dubets | Auto Technic Raicng | BMW M4 GT4 | PA |
| 54 | Tim Pappas | Jeroen Bleekemolen | Black Swan Racing | Porsche 718 Cayman GT4 CLUBSPORT MR | PA |
| 59 | Paul Terry | Brandon Davis | WR Racing | Aston Martin Vantage AMR GT4 | PA |
| 66 | Derek DeBoer | Spencer Pumpelly | TRG - The Racers Group | Porsche 718 Cayman GT4 CLUBSPORT MR | PA |
| 89 | Ross Chouest | Aaron Povoledo | RENNtech Motorsports | Mercedes-AMG GT4 | PA |
| 119 | Sean Quinlan | Gregory Liefooghe | Stephen Cameron Racing | BMW M4 GT4 | PA |
| 450 | Daren Jorgensen | Brett Strom | RHC Jorgensen/Strom | BMW M4 GT4 | PA |
| 930 | Mark Siegel | Tom Dyer | CarBahn | Audi R8 LMS GT4 | PA |
| 5 | Michael McAleenan | Dan Rogers | Motorsport USA | McLaren 570S GT4 | AM |
| 7 | Sean Gibbons | Sam Owen | NolaSport with OGH | Porsche 718 Cayman GT4 CLUBSPORT MR | AM |
| 16 | John Allen | Kris Wilson | Capstone Motorsports | Mercedes-AMG GT4 | AM |
| 17 | James Rappaport | Todd Hetherington | TRG - The Racers Group | Porsche 718 Cayman GT4 CLUBSPORT MR | AM |
| 18 | Matt Forbush | Damon Surzyshyn | Forbush Performance | Toyota GR Supra GT4 | AM |
| 23 | Cavan O'Keefe | Jerold Lowe | Motorsport USA | McLaren 570S GT4 | AM |
| 43 | Aurora Straus | Jeff Mosing | Murillo Racing | Porsche 718 Cayman GT4 CLUBSPORT MR | AM |
| 46 | David Walker | Russell Walker | NOLASPORT | Porsche 718 Cayman GT4 CLUBSPORT MR | AM |
| 68 | John Geesbreght | Kevin Conway | Smooge Racing | Toyota GR Supra GT4 | AM |
| 98 | Paul Sparta | Al Carter | Random Vandals Racing | BMW M4 GT4 | AM |
| 111 | Todd Clarke | Ty Clarke | Motorsport USA | McLaren 570S GT4 | AM |