Customers read a sign posted on the door of a Chipotle Mexican Grill in New York Brendan McDermid/ Reuters Chipotle was once a stock market darling.

The company listed back in 2006 at $22, and grew at an incredible rate over the decade that followed, hitting a high of nearly $750 per share last August.

But a food safety scandal that began in late 2015 put an end to that inexorable rise.

The Mexican fast-food chain's E. coli outbreaks made about 200 people sick and dragged down same-store sales.

In February, federal investigators declared that the E. coli outbreaks appear to be over, though they were not able to identify the ingredient that caused the contamination.

Since then, Chipotle has been trying to regain trust, changing how it prepares and handles food, and giving away free food. Still, the stock is down sharply this year, and is currently trading at around $455 per share.

SumZero, a social network for professional investors, recently asked two of its members to lay out their views on whether it's the right time to buy the stock.

Nick Mazing, founder of investment advisory firm Ampera Capital, is short the shares. Andrew Tseng, who launched Bramble Hill, is betting Chipotle will recover.

Below is the full transcript of their responses.