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Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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Jill E. York, Vice President and Chief Financial Officer February, 2008 NASDAQ: MBFI Investor Presentation

2 When used in this press release and in filings with the Securities and Exchange Commission, in other press releases or other public shareholder communications, or in oral statements made with the approval of an authorized executive officer, the words or phrases "believe," "will," "should," "will likely result," "are expected to," "will continue," "is anticipated," "estimate," "project," "plans," or similar expressions are intended to identify "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. You are cautioned not to place undue reliance on any forward-looking statements, which speak only as of the date made. These statements may relate to our future financial performance, strategic plans or objectives, revenues or earnings projections, or other financial items. By their nature, these statements are subject to numerous uncertainties that could cause actual results to differ materially from those anticipated in the statements. Important factors that could cause actual results to differ materially from the results anticipated or projected include, but are not limited to, the following: (1) expected cost savings and synergies from our merger and acquisition activities might not be realized within the expected time frames; (2) the credit risks of lending activities, including changes in the level and direction of loan delinquencies and write-offs and changes in estimates of the adequacy of the allowance for loan losses; (3) competitive pressures among depository institutions; (4) interest rate movements and their impact on customer behavior and net interest margin; (5) the impact of repricing and competitors' pricing initiatives on loan and deposit products; (6) the ability to adapt successfully to technological changes to meet customers' needs and developments in the market place; (7) our ability to realize the residual values of our direct finance, leveraged, and operating leases; (8) our ability to access cost-effective funding; (9) changes in financial markets; (10) changes in economic conditions in general and in the Chicago metropolitan area in particular; (11) the costs, effects and outcomes of litigation; (12) new legislation or regulatory changes, including but not limited to changes in federal and/or state tax laws or interpretations thereof by taxing authorities; (13) changes in accounting principles, policies or guidelines; and (14) our future acquisitions of other depository institutions or lines of business. MB Financial does not undertake any obligation to update any forward-looking statement to reflect circumstances or events that occur after the date on which the forward-looking statement is made. Forward Looking Statements

3 Who Are We? Financial profile1: $7.8bn in assets $5.6bn in loans $5.5bn in deposits $94mm in net income Rapidly growing Commercial Bank serving middle market companies: Over 85 calling officers with 20+ years average experience Retail and wealth management business lines support our commercial bank Expanding, desirable branch network 70 full service Chicagoland branches Strategically located to have access to 79% of middle market companies 4th largest Chicago-based bank Opportunistic acquisitions add scale, capabilities and market share 1 As of December 31, 2007. Chicago MSA

4 Commercial Banking Largest, most developed business unit, drives company performance Loans to middle-market companies with revenues ranging from $5 to $100mm Treasury Management products for all company sizes Double digit organic growth every year Focused on: Middle-market business financing Treasury management Real estate investor, construction, developer financing Lease banking $826 $1,081 $1,190 $1,416 $1,709 $1,977 $2,656 $2,819 $718 $717 $775 $848 $944 $1,039 $1,413 $1,877 $1,544 $1,798 $1,965 $2,264 $2,653 $3,016 $4,696 $4,069 $0 $500 $1,000 $1,500 $2,000 $2,500 $3,000 $3,500 $4,000 $4,500 $5,000 2000 2001 2002 2003 2004 2005 2006 1 2007 Millions Commercial and Industrial (including lease loans) Commercial Real Estate (including construction real estate) 1 FOBB merger added $632mm in commercial-related loans. 2 Excludes impact of FOBB merger. Including FOBB CAGR = 17%. +15% CAGR 2

5 Credit Quality Excellent, stable, predictable Improving non-performing loan ratios Loans are granular – typical size is $5 to $10 million Net Charge-offs to Average Loans 0.45% 0.25% 0.24% 0.25% 0.39% 0.24% 0.31% 0.16% 0.00% 0.20% 0.40% 0.60% 0.80% 1.00% 2000 2001 2002 2003 2004 2005 2006 2007 Allowance vs. NPL to Total Loans 1.16% 1.19% 1.19% 1.38% 1.42% 1.27% 1.33% 1.22% 0.44% 0.43% 0.85% 0.83% 0.79% 0.92% 0.71% 0.58% 0.00% 0.20% 0.40% 0.60% 0.80% 1.00% 1.20% 1.40% 1.60% 2000 2001 2002 2003 2004 2005 2006 2007 Allowance to Total Loans NPL to Total Loans

6 Diversified Loan Portfolio Commercial 34% Construction 14% Commercial Real Estate 36% Residential, Consumer and Indirect 16% As of December 31, 2007 For Sale Residential Construction 19% Commercial Construction 11% Owner occupied 19% Multi-family 9% Non-owner occupied: Commercial 16% Retail 9% Industrial/Warehouse 7% Healthcare 6% Office 4% Construction and Commercial Real Estate

7 Retail Banking Retail Banking provides much of the funding for our commercial lending business Provides 63% of our deposits Generates 16% of our loans Excellent Chicagoland branch footprint Key differentiation attributes Convenience – Extended branch hours and open 7 days/week in most branches ATM Freedom – Qualifying customers can use any ATM in the world at no cost Extended deposit cut-off times – Accelerates cash availability 2008 objectives Grow low cost account balances Improve deposit mix $391 $431 $456 $552 $623 $641 $924 $876 $447 $496 $490 $620 $713 $636 $1,041 $1,263 $311 $325 $352 $448 $523 $469 $391 $1,079 $1,202 $1,316 $1,396 $1,568 $1,545 $2,572 $2,506 $272 $615 $570 $478 $474 $0 $1,000 $2,000 $3,000 $4,000 $5,000 $6,000 $7,000 2000 2001 2002 2003 2004 2005 2006 2007 Millions Brokered CDs Time & Public Funds Savings NOW & MMDA Non-Interest Bearing $5,581 $5,514 $2,780 $2,577 $3,176 $3,699 $3,906 $2,372 1 1 FOBB merger added $1.9 billion in deposits. 2 Excludes impact of FOBB merger. Including FOBB CAGR = 13%. +6% CAGR2

8 Wealth Management $0.2 $0.4 $0.3 $0.2 $0.6 $0.6 $0.8 $1.1 $0.9 $1.9 $2.1 $0.9 $0.8 $0.5 $0.4 $1.0 $0.0 $0.5 $1.0 $1.5 $2.0 $2.5 $3.0 $3.5 $4.0 2000 2001 2002 2003 2004 2005 2006 2007 Assets Under Management (Billions) Managed Assets Non-Discretionary Assets Private Banking Targets wealthy individuals and business owners Rapidly growing, with profitability metrics similar to Commercial Banking Asset Management and Trust Target market Wealthy individuals Middle market business owners and their families Illinois police and fire retirement funds Guardianships Growing; with increased scale has improved profitability Vision Investment Services Focused on providing brokerage services through our branch network Recently sold third-party component Improving profitability 1 FOBB merger added $1.2 billion in assets under management. 1 $0.6 $0.7 $3.0 $0.7 $1.4 $1.5 $1.7 $3.1

9 40.2% 40.9% 41.4% 44.5% 45.8% 46.1% 53.1% 54.1% 59.0% 59.5% 0% 20% 40% 60% 80% Chicago Los Angeles Miami Philadelphia Washington New York Dallas Boston San Francisco Atlanta ` Rank Institution Branches Total Deposits in Market ($mm) Total Market Share (%) 1 Bank of America 201 39,100 14.6 2 JPMorgan Chase 360 38,956 14.5 3 Harris (Bank of Montreal) 204 29,738 11.1 4 National City 135 10,748 4.0 5 Northern Trust 19 8,950 3.3 6 Fifth Third 150 8,444 3.2 7 Corus Bankshares 14 8,399 3.1 8 Charter One (Royal Bank of Scotland) 133 7,828 2.9 9 Citigroup 68 7,551 2.8 10 Wintrust Financial 73 7,219 2.7 11 MB Financial 70 5,408 2.0 12 First Midwest 89 5,185 1.9 13 FBOP 33 3,306 1.2 14 TCF Financial 209 3,119 1.2 15 Metropolitan Bank Group 85 2,766 1.0 All Other Institutions 81,439 30.4 MSA Total 3,304 268,158 100.0 Strong Position in the Nation’s Least Consolidated Major Market Source: SNL DataSource. Data as of June 30, 2007. Includes pending acquisitions through February 6, 2008. Chicago MSA Rankings Market Share of Top 3 in the Ten Largest U.S. MSAs

10 Disciplined Acquiror and Experienced Integrator Chicago is the least consolidated of the nation’s top 10 MSAs Strive to be the “partner of choice” for sellers Look for mutual win situations The Opportunity Strong Track Record 1 P/E Adjusted is computed as (price – excess equity) / (pre-acquisition core earnings + after-tax cost savings in year one – after tax earnings on excess equity). Target Acquisition Date Asset Size ($mm) Disciplined Pricing. Median Statistics for Above Transactions First Oak Brook Aug ’06 $2,362 First Security Fed May ’04 567 South Holland Feb ’03 560 LaSalle Leasing Aug ’02 92 Lincolnwood Apr ’02 228 FSL Holdings Apr ’01 222 P / E Stated 17.4x P / E Adjusted1 9.7x Price / Book 1.4x Premium / Core Deposits 6.9% 1st Year EPS Accretion 3.5%

11 $26.5 $30.0 $52.6 $63.1 $64.8 $67.1 $93.9 $45.8 3.32% 3.74% 3.71% 3.99% 3.79% 3.77% 3.74% 3.51% $0 $10 $20 $30 $40 $50 $60 $70 $80 $90 $100 2000 2001 2002 2003 2004 2005 2006 2007 0.00% 1.00% 2.00% 3.00% 4.00% 5.00% 6.00% 7.00% 8.00% Net Income NIM Consistent Financial Performance Excludes merger charge of $22.7 million. See "Non-GAAP Disclosure Reconciliations" on page 16. Cash ROTCE 12.8 % 12.9 % 16.8 % 18.4 % 19.5 % 18.2 % 17.0 % 21.1 % NIM / Fed Funds rate Net Income ($mm) --- Fed Funds Long-term success managing our net interest margin 2006-2007 margin negatively impacted by tightening spreads on loans and deposits due to competitive pressures in Chicago market and FOBB merger 2 1 2 1

12 Composition of Total Revenue through December 31, 2007 Fee Income1 30.6% of Total Revenue1 Focus on growing fee income Diversification of revenue streams is important to us Likely expansion areas include deposit fees, trust and asset management, leasing and merchant card processing Net Interest Income 69.4% of Total Revenue1 Deposit Service Fees 7.8% Lease Financing Revenues 5.2% Brokerage Fees 3.1% Trust and Asset Mgmt Fees 3.4% Merchant Processing Fees 5.4% All Other Fees 5.7%1 1 Excludes loss on sale of securities and gain on sale of other assets.

13 Operating Efficiency Net Non-interest Expense to Average Assets Efficiency Ratio Striving to cut expenses and improve our operating leverage FOBB cost savings are in place Shed excess properties / non-core businesses in 2007 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 2000 2001 2002 2003 2004 2005 2006 2007 1.00% 1.20% 1.40% 1.60% 1.80% 2.00% 2.20% 2.40% 2.60% 2.80% 3.00% Efficiency Ratio Net Non-interest Expense to Average Asset Ratio

14 Key Investment Considerations Build Commercial Banking market share Strategy Implementation Add Commercial lenders Add Private Bankers Hire recent college graduates for training program Emphasize Commercial Banking in branding Grow fee income and diversify revenue streams Improve operating leverage Build Wealth Management profitability Acquire opportunistically Enhance Leasing and Brokerage contribution Improve facilities management Improve vendor management Improve operating procedures 13% EPS growth 17% average cash ROTCE 3.70% average NIM 29bps average charge-off ratio Results since 2000

15 Non-GAAP Disclosure Reconciliations These materials contain certain financial measures determined by methods other than in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Such measures include cash return on tangible equity and net interest margin on a fully tax equivalent basis. Cash return on tangible equity is determined by dividing cash earnings by average tangible stockholders’ equity. The most directly comparable GAAP measure, return on equity, is determined by dividing net income by average stockholders’ equity. Cash earnings excludes from net income the effect of amortization expense for intangible assets other than goodwill (which is not amortized but tested for impairment annually), and average tangible stockholders’ equity excludes from average stockholders’ equity acquisition-related goodwill and other intangible assets, net of tax benefit. We believe that the presentation of cash return on tangible equity is helpful in understanding our financial results, as it provides a method to assess our success in utilizing our tangible capital. Net interest margin on a fully tax equivalent basis is determined by dividing net interest income on a fully tax equivalent basis by average interest-earning assets. The most directly comparable GAAP measure, net interest margin, is determined by dividing net interest income by average interest-earning assets. The tax equivalent adjustment to net interest income recognizes the income tax savings when comparing taxable and tax-exempt assets and assumes a 35% tax rate. We believe that it is a standard practice in the banking industry to present net interest margin on a fully tax equivalent basis, and accordingly believe that providing this measure may be useful for peer comparison purposes. The following tables reconcile cash earnings to net income, average tangible stockholders’ equity to average stockholders’ equity and net interest margin on a fully tax equivalent basis to net interest margin for the periods presented: (dollars in thousands)

16 Non-GAAP Disclosure Reconciliations 2000 2001 2002 2003 2004 2005 2006 2007 Net income, as reported 26,548 $ 29,951 $ 45,829 $ 52,567 $ 63,128 $ 64,754 $ 67,114 $ 93,863 $ Plus: Intangible amortization, net of tax 3,022 3,212 631 754 660 645 1,281 2,278 Cash earnings 29,570 $ 33,163 $ 46,460 $ 53,321 $ 63,788 $ 65,399 $ 68,395 $ 96,141 $ Average stockholders' equity 263,917 $ 290,120 $ 319,376 $ 362,151 $ 435,419 $ 492,513 $ 627,069 $ 851,324 $ Less: Goodwill 27,634 30,439 40,773 67,391 101,314 123,879 213,874 379,047 Less: Other intangible assets, net of tax 5,049 2,082 1,914 4,692 7,453 8,496 11,901 17,524 Average tangible stockholders' equity 231,234 $ 257,599 $ 276,689 $ 290,068 $ 326,652 $ 360,138 $ 401,294 $ 454,753 $ Cash Return on Tangible Equity 12.79% 12.87% 16.79% 18.38% 19.53% 18.16% 17.04% 21.14% 2000 2001 2002 2003 2004 2005 2006 2007 Net interest margin 3.64% 3.62% 3.93% 3.71% 3.67% 3.62% 3.40% 3.20% Plus: Tax equivalent effect 0.10% 0.08% 0.06% 0.08% 0.10% 0.12% 0.11% 0.12% Net interest margin, fully tax equivalent 3.74% 3.71% 3.99% 3.79% 3.77% 3.74% 3.51% 3.32%

Jill E. York, Vice President and Chief Financial Officer February, 2008 NASDAQ: MBFI Investor Presentation