Description Available in: The Maine Celtics (formerly the Maine Red Claws) are an American professional basketball team in the NBA G League, based in Portland, Maine. The Maine Celtics play their home games at the Portland Expo Building. The team debuted in the 2009–10 season as the Maine Red Claws and have since won three division titles. The team is owned by the Boston Celtics, who purchased the franchise in July 2019 from Maine Basketball, LLC, a company chaired by William Ryan, Jr. The Boston Celtics renamed the team to the Maine Celtics in 2021.