Chipotle slashed pay for its top executives in 2015 after an E. coli outbreak and other food safety scares sent stock and sales plunging.

The burrito chain’s executive officers were not paid any cash bonuses last year, according to a letter to shareholders included in a regulatory filing on Friday.

“2015 was a year marked by both highs and lows,” as Chipotle’s stock reached an all-time high of $758.61 on Aug. 5, but has since plummeted, closing at $507.85 on Friday.

Co-chief executive Monty Moran’s total pay declined by 52 percent to $13.3 million, while co-CEO Steven Ells’ compensation dropped by 53 percent, to $13.5 million.

The chain reported a nearly 15 percent drop in same-store sales in the fourth quarter.