Newport Beach-based Chipotle Mexican Grill Inc. (NYSE: CMG) said Friday CEO Brian Niccol added board chairman to his title.

Niccol succeeds Chipotle founder Steve Ells, who previously served as executive chairman. Ells is also no longer a board director.

Ells stepped away from the CEO role two years ago when Niccol was tapped for the top spot. Niccol previously helmed Irvine-based Taco Bell Corp. as its CEO.

Meantime, the company said board directors Matthew Paull and Paul Cappuccio would not go for re-election at the company’s upcoming annual shareholder meeting.

Chipotle, which had a recent market cap of $20 billion, was trading down 1% in midday trading Friday to $720.03.