Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
RIESER RICHARD M JR
   2. Issuer Name and Ticker or Trading Symbol
MB FINANCIAL INC /MD [MBFI] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) __X__ Other (specify below)
EVP, Chief Marketing and / Legal Strategist
(Last)
(First)
(Middle)
C/O MB FINANCIAL, INC., 6111 NORTH RIVER ROAD		 3. Date of Earliest Transaction (Month/Day/Year)
08/25/2006
(Street)

ROSEMONT, IL 60018		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 08/25/2006   A   2,684 A $ 0 (1) 2,684 I Stock Bonus Plan
Common Stock 08/25/2006   A   50,716 A $ 0 (2) 50,716 I Owned by Spouse
Common Stock 08/25/2006   A   2,247 A $ 0 (3) 2,247 I Irrevocable Living Trust for Son
Common Stock 08/25/2006   A   442,710 A $ 0 (4) 442,710 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy) $ 32.6 08/25/2006   A   15,504   08/25/2006(5) 01/27/2014 Common Stock 15,504 $ 0 15,504 D  
Stock Option (Right to Buy) $ 28.46 08/25/2006   A   17,054   08/25/2006(6) 01/31/2012 Common Stock 17,054 $ 0 17,054 D  
Stock Option (Right to Buy) $ 26.88 08/25/2006   A   20,672   08/25/2006(7) 01/24/2013 Common Stock 20,672 $ 0 20,672 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
RIESER RICHARD M JR
C/O MB FINANCIAL, INC.
6111 NORTH RIVER ROAD
ROSEMONT, IL 60018		   X     EVP, Chief Marketing and Legal Strategist

Signatures

 /s/ Doria L. Koros, attorney-in-fact for Mr. Rieser   08/29/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents the reporting person's proportionate interest in shares of MBFI common stock held by the FOBB Stock Bonus Plan. Such shares, along with the cash merger consideration paid to the plan, were received by the plan in connection with the Merger.
(2) Received, along with cash merger consideration, in exchange for 50,834 shares of FOBB common stock in connection with the Merger.
(3) Received, along with cash merger consideration, in exchange for 10,104 shares of FOBB common stock in connection with the Merger.
(4) Received, along with cash merger consideration, in exchange for 670,162 shares of the common stock of First Oak Brook Bancshares, Inc. ("FOBB") in connection with the merger (the "Merger") of FOBB with MB Financial, Inc. ("MBFI"). On August 25, 2006, the effective date of the merger, the closing price of MBFI common stock was $36.03 and the closing price of FOBB common stock was $37.30.
(5) Received in the Merger in exchange for an option to purchase 15,000 shares of FOBB common stock at an exercise price of $33.70 per share.
(6) Received in the Merger in exchange for an option to purchase 16,500 shares of FOBB common stock at an exercise price of $29.42 per share.
(7) Received in the Merger in exchange for an option to purchase 20,000 shares of FOBB common stock at an exercise price of $27.78 per share. The option vested in full upon completion of the Merger.

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