Chipotle stock plunged in aftermarket trading after the fast-casual restaurant chain posted solid earnings but its quarterly revenues were lower than what analysts had expected. For the three months ended in December,

Some analysts said tougher comparisons, harsher weather and holiday timing may have put pressure on the fast-casual chain’s recent sales.

Excluding restaurant impairment charges, legal costs and other items, Chipotle earned 25 cents per share. Net sales climbed 13.1% to $2.85 billion. The company's same-store sales