Organisation
IMSA
International Motor Sports Association. Owned by NASCAR. Functions as sanctioning body and series promoter for sportscar racing — WeatherTech SportsCar Championship (GTP, GTD Pro, GTD), Michelin Pilot Challenge, Prototype Challenge.
Governed (7)
Ferrari Challenge North America
FC North AmericaFerrari's one-make series for North American racing clients, part of the Corse Clienti programme.
GT America Powered by AWS
GT AmericaSRO's single-driver GT3 sprint series in the United States, racing under IMSA sanction.
IMSA Michelin Pilot Challenge
Pilot ChallengeIMSA's production-based support championship — GT4 and touring classes in two- and four-hour races.
IMSA VP Racing SportsCar Challenge
VP ChallengeIMSA's entry-level development series — LMP3 and GT4 machinery in single-driver sprints.
IMSA WeatherTech SportsCar Championship
IMSANorth America's top sports car championship — GTP, LMP2 and GTD classes, headlined by the Rolex 24 at Daytona.
Lamborghini Super Trofeo North America
Super Trofeo North AmericaLamborghini's one-make series for North America, racing at classic venues like Laguna Seca and Watkins Glen.
Whelen Mazda MX-5 Cup
MX-5 CupIMSA's one-make Mazda MX-5 championship — identical spec cars racing as the support bill at IMSA WeatherTech weekends.
Promoted (4)
IMSA Michelin Pilot Challenge
Pilot ChallengeIMSA's production-based support championship — GT4 and touring classes in two- and four-hour races.
IMSA VP Racing SportsCar Challenge
VP ChallengeIMSA's entry-level development series — LMP3 and GT4 machinery in single-driver sprints.
IMSA WeatherTech SportsCar Championship
IMSANorth America's top sports car championship — GTP, LMP2 and GTD classes, headlined by the Rolex 24 at Daytona.
Whelen Mazda MX-5 Cup
MX-5 CupIMSA's one-make Mazda MX-5 championship — identical spec cars racing as the support bill at IMSA WeatherTech weekends.