March 13, 2006

Approval of proposal by Marshall & Ilsley Corporation

For immediate release

The Federal Reserve Board on Monday announced its approval of the application under section 3 of the Bank Holding Company Act by Marshall & Ilsley Corporation, Milwaukee, Wisconsin, to acquire Trustcorp Financial, Inc., St. Louis, and its subsidiary bank, Missouri State Bank and Trust Company, Clayton, both of Missouri.

Attached is the Board's Order relating to this action.

Last Update: March 13, 2006