Leder, who owns Sun Capital, a private-equity firm based in Boca Raton, Fla., went to the Wharton School. In 2011 he joined fellow Wharton grads Joshua Harris and David Blitzer to purchase the Sixers. Harris and Blitzer are co-managing owners with at least 10 other partners, including Will Smith, wife Jada Pinkett Smith and James Lassiter, Smith's longtime producing partner in Overbrook Entertainment, all of whom own much smaller stakes.
A Sixers spokesman said the team had no comment.
A woman who answered the phone at Sun Capital said there was nobody there who could discuss the Romney fundraiser, and a detailed email requesting comment was not answered Tuesday.