First Midwest Bancorp (ONBPP) 8-K Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) December 12, 2005 First Midwest Bancorp, Inc. (Exact name of registrant as specified in its charter)
Delaware (State or other jurisdiction of Incorporation)	0-10967 (Commission File Number)	36-3161078 (IRS Employer Identification No.)
One Pierce Place, Suite 1500, Itasca, Illinois (Address of principal executive offices)			60143 (Zip Code)
(630) 875-7450 (Registrant's telephone number, including area code) N/A (Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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FIRST MIDWEST BANCORP, INC.

FORM 8-K

December 12, 2005

Item 7.01 Regulation FD Disclosure On December 12, 2005, First Midwest Bancorp, Inc. (the "Company") presented details of a definitive agreement to acquire Bank Calumet, Inc., which is available on the Company's website, www.firstmidwest.com, and is attached as Exhibit 99.1 to this report.
Item 8.01 Other Events On December 12, 2005, First Midwest Bancorp, Inc. issued a press release announcing the execution of a definitive agreement to acquire Bank Calumet, Inc. This press release, dated December 12, 2005, is attached as Exhibit 99.2 to this report.
Item 9.01 Financial Statements and Exhibits
	(a) and (b) not applicable
	(c) Exhibit Index:
	99.1	Power Point presentation to be delivered by the Company's Chief Executive Officer on December 13, 2005.
	99.2	Press Release issued by the Company dated December 12, 2005.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused
this report to be signed on its behalf by the undersigned thereunto duly authorized.
			First Midwest Bancorp, Inc.
			(Registrant)
Date: December 12, 2005			/s/ STEVEN H. SHAPIRO
			Steven H. Shapiro Executive Vice President

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