Taubman bought the ailing British auction house, Sotheby's, in 1983, acting as a white knight when the company was threatened by a hostile and unwanted takeover by Marshall Cogan and Stephen Swid of General Felt. He revived the fortunes of Sotheby's, which had been slumping in the eighties; he took the company public in 1988. His family divested controlling interest in Sotheby's by September 2005.
From 1983 to 1984, Taubman was the majority owner of the Michigan Panthers of the United States Football League. Although the Panthers acquired a fairly loyal following and won the first USFL title in 1983, the USFL's decision to move from the spring to the fall led Taubman to merge his team with the Oakland Invaders for the 1985 season, with himself as majority owner of the Invaders. That team folded along with the rest of the USFL after the 1985 season.