Chipotle Mexican Grill Inc. shares sank 7.4% in Thursday trading following the highly-anticipated after-hours investor update call that analysts say lacked detail. Among the announcements, Chipotle said it would close 55 to 65 stores and add digital capabilities to modernize the restaurant experience. "Chipotle's investor call outlined strategic initiatives, but didn't provide much visibility into the potential and timing of an improved sales and earnings trajectory," wrote UBS analysts, who rate Chipotle shares sell. They have a $300 price target on Chipotle stock. AB Bernstein is more upbeat, writing that first-quarter sales trends have continued into the second quarter. "Chipotle's focus is appropriately on driving topline to support an improved economic model," analysts led by Sara Senatore wrote. AB Bernstein rates Chipotle outperform with a $500 target price. Chipotle shares have gained 46.5% for the year to date, while the S&P 500 index is up 1.4%.