The corporate office of the business is located in Rosemont, Illinois. Its operations are comprised of 15 wholly owned banking subsidiaries. These companies also operate several other subsidiaries. The major operating banking subsidiaries of Wintrust Financial Corporation include Hinsdale Bank & Trust Company, Lake Forest Bank & Trust Company, Libertyville Bank & Trust Company, St. Charles Bank & Trust Company, Northbrook Bank & Trust Company, Wheaton Bank & Trust Company, State Bank of the Lakes, Village Bank & Trust and Wintrust Bank. Their five nationally chartered banks are Crystal Lake Bank & Trust Company, Beverly Bank & Trust Company, Barrington Bank & Trust Company, Schaumburg Bank & Trust Company, Old Plank Trail Community Bank.
As of December 2014, the company has reported their assets to be around $20 billion. Wintrust Financial Corporation continues to operate as a NASDAQ Stock Exchange traded venture.