Chipotle Mexican Grill (CMG 0.68%) has been one of the more stellar investments in the restaurant space over the past decade. It launched its initial public offering (IPO) 18 years ago at $22 per share, and as it expanded and deepened its footprint in the U.S., it has grown to nearly 3,400 locations across the country.That impressive expansion has resulted in gains of more than 120-fold for shareholders who bought at the IPO and held. Despite that stunning growth, the restaurant stock will likely continue m ...