The first Indianapolis 500 was held in 1911, where Ray Harroun was declared the first winner, driving the Marmon Wasp. The race has been run annually since 1911 (with exceptions during World War I and World War II) and 71 drivers have been crowned champions of the 500-mile race over the course of 101 races. The most race victories held by a single driver is four, which has been accomplished only by A.J. Foyt, Al Unser and Rick Mears. The Indianapolis 500 has also drawn many international drivers to the Indianapolis Motor Speedway over the years, with 26 of the winners coming from outside of the United States, representing nine separate countries. The most recent champion of the Indianapolis 500 is Takuma Sato, winner of the 2017 race.

Answer this question based on the passage: who has won the indy 500 the most? OK. Let's think. My stream of consciousness:
To answer the above question, the relevant sentence is: The most race victories held by a single driver is four, which has been accomplished only by A.J. Foyt, Al Unser and Rick Mears. The answer is A.J. Foyt , Al Unser and Rick Mears.