425



Filed by First Midwest Bancorp, Inc.
Pursuant to Rule 425 under the Securities Act of 1933
and deemed filed pursuant to Rule 14a-12
under the Securities Exchange Act of 1934
Subject Company: First Midwest Bancorp, Inc.
(Commission File No. 0-10967)

Set forth below is a letter to customers of The National Bank & Trust Company of Sycamore in connection with the proposed merger between First Midwest Bancorp, Inc. and NI Bancshares Corporation.