Chipotle later denied the practice, insisting portion sizes were “generous” at its restaurants. Related: Chipotle test confirms customers’ suspicions about portion sizes. We

Chipotle Mexican Grill was sued on Monday by shareholders for concealing how many of its restaurants were skimping on portions, forcing the chain to spend more on ingredients and hurting its stock price.

A Chipotle shareholder is suing the fast-casual chain over viral social media complaints about skimpy portion sizes.