Find out about the owners of the St. Louis Cardinals, their net worth, source of wealth and ownership history of the MLB franchise. The St. Louis Cardinals are a household name in the MLB franchise based in St. Louis, Missouri, and are a member club of the National League Central Division. The Cardinals were founded in 1882 and are regarded as one of the most successful teams in MLB history, with 11 other World Series titles. Who owns the St. Louis Cardinals? The St. Louis Cardinals is currently owned by William DeWitt Jr, who has been the principal owner of the franchise since 1996. The ownership group of the team also includes William DeWitt III and Adam Wainwright. St. Louis Cardinals ownership structure William DeWitt Jr. William DeWitt Jr is an American businessman who is known for his position as the principal owner. He purchased the St. Louis Cardinals alongside Stephen F. Brauer for $150 million from previous owner Anheuser-Busch. According to figures, he has a net worth a...