| 01 | Pruett / Rojas / Lloyd | Chip Ganassi Racing with Felix Sabates (USA) | Mike Hull | Riley | Mk XI | Lexus | DP |
| 06 | Edwards / Reese / Bunting / Curran | Banner Racing (USA) | Leighton Reese | Pontiac | GXP.R | Pontiac | GT |
| 07 | Edwards / Collins / Wilson | Banner Racing | Leighton Reese | Pontiac | GXP.R | Pontiac | GT |
| 6 | Pew / James / Matos | Michael Shank Racing | Michael Shank | Riley | Mk XX | Ford | DP |
| 7 | Plumb / Sigal / Grégoire | Sigalsport | Emmanuel Lupe | Riley | Mk XX | BMW | DP |
| 10 | Angelelli / Valiante | SunTrust Racing | Wayne Taylor | Dallara | DP01 | Pontiac | DP |
| 16 | Garcia / Fittipaldi / Babini | Cheever Racing | Eddie Cheever, Jr. | Coyote | CC/08 | Pontiac | DP |
| 21 | Reindler / Alessi / Kapudija | Matt Connolly Motorsports | Matt Connolly | Pontiac | GTO.R | Pontiac | GT |
| 22 | de Quesada / *Dumoulin / *Basseng | Alegra Motorsports | Carlos de Quesada | Riley | Mk XI | Porsche | DP |
| 23 | Auberlen / Hand | Alex Job Racing | Alex Job | Riley | Mk XI | Porsche | DP |
| 27 | O'Connell / Roush | O'Connell Racing | Kevin O'Connell | Porsche | 997 GT3 Cup | Porsche | GT |
| 30 | Harrington / Armengol / Peterson | Racers Edge Motorsports | Jon Mirachi | Mazda | RX-8 | Mazda | GT |
| 32 | Forest / Barrett / Gue | PR1 Motorsports | Bobby Oergel | Pontiac | GXP.R | Pontiac | GT |
| 40 | Foster / Dempsey / Espenlaub | Hyper Sport | Joe Foster | Mazda | RX-8 | Mazda | GT |
| 42 | Sahlen / Nonnamaker / Nonnamaker | Team Sahlen | Mike Thomas | Chevrolet | Corvette | Chevrolet | GT |
| 43 | Nonnamaker / Nonnamaker | Team Sahlen | Mike Thomas | Chevrolet | Corvette | Chevrolet | GT |
| 53 | Constantine / Borkowski / Lazzaro | Playboy Racing | | BMW | M6 | BMW | GT |
| 55 | Tucker / Bouchut / *Zabinski | LevelFive Motorsports | David Stone | Ferrari | F430 | Ferrari | GT |
| 57 | Liddell / Davis | Stevenson Motorsports | John Stevenson | Pontiac | GXP.R | Pontiac | GT |
| 58 | Law / Donohue / Rice | Brumos Racing | Michael Colucci | Riley | Mk XI | Porsche | DP |
| 59 | France / Barbosa / *Haywood | Brumos Racing (USA) | Michael Colucci | Riley | Mk XI | Porsche | DP |
| 60 | Patterson / Negri / Dalziel | Michael Shank Racing | Michael Shank | Riley | Mk XX | Ford | DP |
| 61 | Frisselle / Wilkins / da Matta | AIM Autosport | Ian Willis | Riley | Mk XX | Ford | DP |
| 65 | Gutierrez / Potter / Stanton | TRG/Riegel Autosport (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | Porsche | GT |
| 66 | Pumpelly / Ballou / Sellers | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | Porsche | GT |
| 67 | Lally / Long / George, Jr. | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | Porsche | GT |
| 69 | Assentato / *Longhi / *Segal | SpeedSource | Sylvain Tremblay | Mazda | RX-8 | Mazda | GT |
| 70 | Haskell / Tremblay / Ham | SpeedSource | Sylvain Tremblay | Mazda | RX-8 | Mazda | GT |
| 72 | Lewis, Jr. / Borcheller | Autohaus Motorsports | Nathan McBride | Pontiac | GXP.R | Pontiac | GT |
| 75 | Krohn / van de Poele / Said | Krohn Racing | David Brown | Lola | B08/70 | Pontiac | DP |
| 76 | Jönsson / Zonta | Krohn Racing | David Brown | Lola | B08/70 | Pontiac | DP |
| 77 | Gidley / *Frisselle / *Jaeger | Doran Racing (USA) | Kevin Doran | Dallara | DP01 | Ford | DP |
| 86 | Lux / Keen / Farnbacher | Farnbacher Loles Racing | Gregory Loles | Porsche | 997 GT3 Cup | Porsche | GT |
| 87 | Werner / Miller / Henzler | Farnbacher Loles Racing | Gregory Loles | Porsche | 997 GT3 Cup | Porsche | GT |
| 88 | Lacey / Farnbacher / Henzler / *Johnson | Farnbacher Loles Racing | Gregory Loles | Porsche | 997 GT3 Cup | Porsche | GT |
| 91 | Matthews / Goossens / Hunter-Reay | Bob Stallings/ Riley-Matthews | Bill Riley | Riley | Mk XX | Pontiac | DP |
| 99 | Gurney / Fogarty / Vasser | Gainsco/Bob Stallings Racing | Bob Stallings | Riley | Mk XX | Pontiac | DP |