MB Financial and First Oak Brook Receive Stockholder Approvals for Merger

MB Financial, Inc. (Nasdaq:MBFI) and First Oak Brook
Bancshares, Inc. (Nasdaq:FOBB) announced that they received the
stockholder approvals needed for their merger at the special meetings
of stockholders of the companies held today. Subject to receipt of all
required regulatory approvals, the companies expect to complete the
merger by the end of August 2006.
   MB Financial, Inc. is the Chicago-based $5.9 billion holding
company for MB Financial Bank, N.A., and Union Bank N.A. (Oklahoma).
First Oak Brook Bancshares, Inc. is the $2.4 billion holding company
for Oak Brook Bank, Oak Brook, Illinois.

   Safe Harbor Statement: Statements in this press release that are
not historical facts are "forward-looking statements" within the
meaning of the Private Securities Litigation Reform Act of 1995. By
their nature, such statements are subject to numerous factors that
could cause actual results to differ materially from those anticipated
in the statements. In the case of the statement regarding the
anticipated timing of the completion of the MB Financial/First Oak
Brook merger, such factors include the possibility that the receipt of
all required regulatory approvals might be delayed or not occur at all
and the possibility that the satisfaction or waiver of one or more of
the other conditions to completion of the merger under the merger
agreement might be delayed or not occur at all.
   Additional Information: MB Financial has filed a registration
statement on Form S-4 with the Securities and Exchange Commission (the
"SEC"), which was declared effective by the SEC, in connection with
the MB Financial/First Oak Brook merger. The registration statement
includes a joint proxy statement of MB Financial and First Oak Brook
that also constitutes a prospectus of MB Financial (the "joint proxy
statement/prospectus"), which was sent to the stockholders of MB
Financial and First Oak Brook. Stockholders are advised to read the
joint proxy statement/prospectus, which was filed by MB Financial with
the SEC on June 27, 2006, because it contains important information
about MB Financial, First Oak Brook and the merger. The joint proxy
statement/prospectus, and other documents relating to the merger filed
by MB Financial and First Oak Brook, can be obtained free of charge
from the SEC's website at www.sec.gov. These documents also can be
obtained free of charge by accessing MB Financial's website at
www.mbfinancial.com under the tab "Investor Relations" and then under
"SEC Filings" or by accessing First Oak Brook's website at
www.firstoakbrook.com. Alternatively, these documents can be obtained
free of charge from MB Financial upon written request to MB Financial,
Inc., Secretary, 6111 North River Road, Rosemont, Illinois 60018 or by
calling [phone], or from First Oak Brook, upon written request
to First Oak Brook Bancshares, Inc., Rosemarie Bouman, 1400 Sixteenth
Street, Oak Brook, Illinois 60523, or by calling [phone].