Chipotle Mexican Grill Inc. (NYSE:CMG) shares fell 17.58% to $32.77 in pre-market trading on Thursday following the release of its third-quarter results and a downward revision of its full-year guidance.Check out the current price of CMG stock here.Comparable Sales Rise 0.3$3 billion in revenue for the third quarter, up 7.5% from a year earlier. Comparable restaurant sales rose 0.3%, driven by a 1.1% increase in average check size, partly offset b ...