Ryan & Maniskas, LLP Announces Investigation of Marshall & Ilsley Corporation

Ryan & Maniskas, LLP (www.rmclasslaw.com/cases/mi) is investigating potential claims against the board of directors of Marshall & Ilsley Corporation ("Marshall & Ilsley" or the "Company") (NYSE: MI) concerning possible breaches of fiduciary duty and other violations of law related to the Company’s efforts to sell Marshall & Ilsley to BMO Financial Group (“Bank of Montreal”) in a transaction with a value of approximately USD$4.1 billion.

Our investigation concerns possible breaches of fiduciary duty and other violations of law related to the approval of the transaction by Company’s board of directors; in particular, whether the Company undertook a fair process to obtain fair consideration for all shareholders of Marshall & Ilsley. For more information regarding our investigation, please contact Ryan & Maniskas, LLP (Richard A. Maniskas, Esquire) toll-free at (877) 316-3218 or by email at rmaniskas@rmclasslaw.com or visit: www.rmclasslaw.com/cases/mi.

Under the terms of the definitive agreement, each outstanding share of Marshall & Ilsley will be exchanged for 0.1257 shares of Bank of Montreal upon closing. Based on the closing share price of Bank of Montreal on the Toronto Stock Exchange of CAD$62.05 on December 16, 2010, the transaction values each share of M&I at USD$7.75.

If you own shares of Marshall & Ilsley and would like to learn more about these claims or if you wish to discuss these matters and have any questions concerning this announcement or your rights, contact Richard A. Maniskas, Esquire toll-free at (877) 316-3218 or to sign up online, visit: www.rmclasslaw.com/cases/mi. You may also email Mr. Maniskas at rmaniskas@rmclasslaw.com. For more information about class action cases in general, please visit our website: www.rmclasslaw.com.

Ryan & Maniskas, LLP is a national shareholder litigation firm. Ryan & Maniskas, LLP is devoted to protecting the interests of individual and institutional investors in shareholder actions in state and federal courts nationwide.