Overview

• IMSA published 45 full-season entries for 2026 plus nine Michelin Endurance Cup–only cars, with Rolex 24 grids again expected to top 60.
• Team WRT will operate BMW’s pair of factory M Hybrid V8s, while the 11-car GTP slate features five manufacturers and omits Proton’s privateer Porsche and Lamborghini’s SC63.
• GT class moves for 2026 include DragonSpeed to GTD, Paul Miller Racing trimming to one car, Risi Competizione returning for enduros, Triarsi stepping to GTD Pro for enduros, and Van der Steur and Riley confirmed in GTD.
• Manthey Racing confirmed a two-car Porsche Endurance Cup program—Grello in GTD Pro and a GTD entry with Ryan Hardwick named—while IMSA extended its Michelin partnership to 2035 and introduced a new GTP sustainability award.
• On track at Road Atlanta, Michael Cooper swept Michelin Pilot Challenge practice before Friday’s Fox Factory 120 title decider, and Action Express Racing’s Cadillac led opening WeatherTech practice.