The Brief Portillo’s CEO Michael Osanloo has stepped down effective immediately. Board Chairman Michael Miles Jr. has been named interim CEO as the company searches for a permanent replacement. Portillo’s announced Monday that President and CEO Michael Osanloo is stepping down, effective immediately. A hot dog, fries and soda arranged at a Portillo's restaurant in Chicago, Illinois, US, on Tuesday, Sept. 27, 2022. (Christopher Dilts/Bloomberg via Getty Images)The company has appointed Board Chairman Michael Miles Jr. as interim CEO while it searches for a permanent replacement.