The League's premier series debuted in 1996 under the name Indy Racing League. The series adopted the name Indy Racing League IndyCar Series in 2003. With Verizon as corporate sponsor from 2014 through 2018, the series has been known as the Verizon IndyCar Series. On January 15, 2019, it was announced that NTT Corporation (Nippon Telegraph and Telephone) would become the title sponsor and the series will become the NTT IndyCar Series.
The series initially raced exclusively on oval tracks, as the series was founded partly in response to the increasing prominence of road and street courses on the CART schedule. In 2005, the series abandoned its unofficial ovals-only stance, and added three road–street course events. By 2009, the series had a roughly 50/50 split of ovals and road/street courses. Presently, the series currently runs one-third of its schedule on ovals and the rest on road and street circuits.
Indy Lights is the development series for the IndyCar series. The Indy Lights concept traces its roots back the USAC Mini Indy Series of the late 1970, and the CART ARS/Indy Lights series that began in 1986. The current Indy Lights series debuted in 2002 under the name Infiniti Pro Series. After the 2008 open wheel unification, the Indy Lights name returned. The Indy Lights typically run as support races to IndyCar Series races, but occasionally has run stand-alone races, or as a support race of other events. The series is now promoted by Andersen Promotions.
Indy Pro 2000
The Indy Pro 2000 Championship presented is an open-wheel racecar driver development series in North America. Competitors use spec cars built by Tatuus. The original series, using first-generation tube-frame cars started in the early 1990s. The second-gen, high-tech, carbon-fiber car was released in 2004. From 2017, the series has used spec Tatuus PM-18s. The series has historically included road courses, street courses, and ovals. The series' primary sponsors is Cooper Tire and the cars, while purpose built for the track with carbon fiber monocoques, are powered by 275 horsepower Mazda-prepared 2 liter MZR-PM18A engines. The series' stated goal is "to develop new race driving talent." In 2010, the series became a part of The Road to Indy. In 2013 the series' promotion was taken over by Andersen Promotions. In 2019, following the departure of Mazda as an official sponsor, the series was rebranded as Indy Pro 2000 from its previous Pro Mazda name.
USF2000 is a series the organisation started sanctioning in 2010. Originally started in 1991 and
folded in 2006, it was restarted in 2010 as part of the "Road to Indy" ladder series promoted by Andersen Promotions. The series utilizes tube frame Formula Ford chassis fitted with larger Mazda MZR four cylinder engines and wings and slicks and was originally based on the Formula Continental rules formula.