Steve Ells opens first Chipotle Mexican Grill in Denver.
Second location opens in Boulder.
McDonald's invests. The first Chipotle outside Colorado opens in Kansas City.
The company surpasses 500 locations.
Chipotle goes public on the New York Stock Exchange. It was the best IPO for a U.S. company in six years. The $22 price of the initial public offering doubled on the first day to $44 and had grown by more than 3,000 percent in a decade before its recent swoon.
McDonald's divests. It's $360 million investment grew to $1.5 billion.
Chipotle opens its 1,000th location.
Annual revenue tops $4 billion.
Chipotle reports 17.3 percent same-store sales growth.