The Mercantile Bank of St. Louis was founded in St. Louis, Missouri in 1850.
In 1996 its chief executive Thomas H. Jacobsen began a series of 24 acquisitions over three years increasing its assets from $15.9 billion to $35.8 billion. One of the biggest acquisitions was that of Mark Twain Bancshares in 1996.
At the time of its acquisition Mercantile was a $36 billion multi-bank holding company headquartered in St. Louis operating 500 locations in Missouri, Iowa, Kansas, Illinois, Arkansas and Kentucky. Its individual components were:
- Mercantile Bank, N.A., St. Louis, Missouri
- Mercantile Bank, Overland Park, Kansas
- Mercantile Bank of Arkansas, N.A.
- Mercantile Bank Midwest in Iowa
- Mercantile Bank of Kentucky
- Mercantile Bank of Trenton in Missouri
- Mercantile Bank of Illinois
- Mercantile Trust Company, N.A. in St. Louis
- profile in International Directory of Company Histories, Vol. 33. St. James Press, 2000 - via fundinguniverse.com
- Mercantile Bancorporation, Long a Buyer, Will Be Bought - New York Times - February 23, 2008
- Firstar Corporation Shareholders Approve Merger With Mercantile Bancorporation, Inc Business Wire, July 28, 1999