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                                  NEWS RELEASE

        DATE:          July 19, 2006    4:30 p.m. E.S.T.
        CONTACT:       James L. Saner, Sr., President and CEO
                       MainSource Financial Group, Inc.  812-663-0157

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                    MAINSOURCE FINANCIAL GROUP-NASDAQ, MSFG -
                 Announces Earnings for the Second Quarter 2006


Greensburg,  Indiana  (NASDAQ:  MSFG)  James L.  Saner,  Sr.,  President & Chief
Executive Officer of MainSource  Financial Group,  announced today the unaudited
results for the  quarter  ended June 30,  2006.  The  Company  reported  diluted
earnings per share of $0.35, which represents a 5.4% decrease from the $0.37 per
share reported in the second quarter of 2005. Net income was $5.5 million in the
second  quarter of 2006 compared to $4.3 million for the same period a year ago.
Key measures of the financial  performance  of the Company are return on average
shareholders'   equity  and  return  on  average   assets.   Return  on  average
shareholders'  equity was 11.11% for the second  quarter of 2006 while return on
average  assets  was 1.10% for the same  period.  The  Company  consummated  its
acquisitions  of HFS Bank and  Peoples  Ohio  Financial  Corporation  during the
quarter. The acquisitions added approximately $434 million in total assets, $365
million in loans and $258 million in deposits.

Mr. Saner  stated,  "We are pleased with our second  quarter  results  given the
interest rate environment and increased  pressure on our margin. We were able to
consummate our northeast  Indiana  acquisition as well as the acquisition  which
takes our  company  into Ohio.  Both of these  transactions  are  expected to be
neutral to our  earnings  per share in 2006 and  accretive  to earnings in 2007.
During the second quarter we announced the purchase of five small branch offices
in Indiana from First Financial Bancorp, headquartered in Hamilton, Ohio. All of
these  offices are in our current  markets and will increase our market share in
each of the three counties.

Mr. Saner added,  "We are  especially  pleased with the organic  growth from our
existing bank subsidiaries.  Excluding the recent  acquisitions,  our total loan
portfolio grew in the second quarter at an annualized rate of 8.4%. In addition,
our deposits  also grew at an annualized  rate of 12.8%.  We believe we will see
our  business  loan  portfolio  continue  to grow  but  deposit  growth  will be
extremely  competitive.  We  will  complete  our  acquisition  of  the  branches
mentioned  above and begin the  process of core  systems  conversion  of our new
affiliates  in the third  quarter.  We  continue  to place  emphasis  on organic
growth, improving our efficiency ratio, and expanding commercial services in the
geographic territories of our new acquisitions, all in hopes of having third and
fourth quarters exceeding the operating earnings per share MainSource  delivered
in the first and second quarters."

NET INTEREST INCOME
- -------------------

Net  interest  income was $16.4  million for the second  quarter of 2006,  which
represents an increase of 24.4% versus the second  quarter of 2005. The increase
was due  primarily  to  acquisitions  and a  corresponding  increase  in average
earning assets.  Net interest margin,  on a fully-taxable  equivalent basis, was
3.82% for the second  quarter of 2006 versus 4.04% for the first quarter of 2006
and 4.00%  for the  fourth  quarter  of 2005.  The  acquisitions  of the  thrift
institutions  in the first and second  quarters of 2006 and their  corresponding
lower net  interest  margins  were the  primary  cause for the  decrease  in the
Company's  net interest  margin.  In addition,  the Company is operating in very
competitive   markets  for  all  deposits,   especially   core  deposits.   This
environment,  coupled  with the  increase in  short-term  borrowing  rates,  has
resulted in a higher than expected increase in the overall cost of funds.

NON-INTEREST INCOME
- -------------------

The  Company's  non-interest  income  increased  to $5.9  million for the second
quarter  of 2006  compared  to $4.8  million  for the same  period in 2005.  The
increase  was  primarily  due  to  the  aforementioned  acquisitions.  Excluding
acquisition  activity,  the Company's  non-interest  income would have been $5.4
million,  an  increase  of 12.5%  compared  to the same  period a year ago.  The
Company  settled its interest rate swap agreement and realized a pre-tax gain of
$0.5 million.




NON-INTEREST EXPENSE
- --------------------

The Company's  non-interest  expense was $14.6 million for the second quarter of
2006  compared  to $11.9  million  for the same  period  in 2005.  Increases  in
employee  costs,   occupancy  expenses,   equipment  expenses,  and  intangibles
amortization were primarily  attributable to acquisitions closed since the third
quarter of 2005 and first quarter of 2006. These increases were partially offset
by a decrease in other expenses  (excluding the  acquisitions)  due primarily to
the cost savings derived from the consolidation of the Company's Indiana banking
charters  in 2005.  The  Company's  efficiency  ratio was  63.9% for the  second
quarter of 2006 compared to 64.2% in the second  quarter of 2005.  For the first
six months of 2006, the Company's  efficiency  ratio was 63.4% compared to 66.2%
for the same period a year ago.

ASSET QUALITY
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Non-performing  assets were $21.5  million as of June 30, 2006 compared to $14.3
million  as of June 30,  2005 and  $17.4  million  as of March  31,  2006.  This
increase is  primarily  due to the  acquisitions  closed in the first and second
quarters of 2006. In total the three recent  acquisitions  added $8.6 million of
non-performing  assets with $4.9  million  being added in the second  quarter of
2006.  As a  percent  of  total  assets,  non-performing  assets  have  remained
relatively flat over the past several quarters and were 0.90% of total assets as
of June 30, 2006. Net  charge-offs  for the second quarter of 2006 equaled 0.22%
of average  outstanding  loans compared to 0.25% for the second quarter of 2005.
For the first six months of 2006, net charge-offs  have equaled 0.20% of average
outstanding  loans,  which was similar to the 0.19% of net charge-offs  incurred
for the same period in 2005.


                           MAINSOURCE FINANCIAL GROUP
                                   (unaudited)
                  (Dollars in thousands except per share data)


Income Statement Summary                            Three months ended June 30                   Six months ended June 30
                                                    --------------------------                   ------------------------
                                                     2006                2005                   2006                   2005
                                                ----------------    ----------------    ---------------------    ------------------
                                                                                                               
    Interest Income                                     $28,582             $19,533                  $51,237               $38,226

    Interest Expense                                     12,174               6,348                   20,595                12,336
                                                ----------------    ----------------    ---------------------    ------------------
    Net Interest Income                                  16,408              13,185                   30,642                25,890

    Provision for Loan Losses                               363                 340                      723                   460
    Noninterest Income:

          Insurance commissions                             521                 523                      941                 1,110

          Mortgage banking                                  564                 679                    1,144                 1,225

          Service charges on deposit accounts             2,303               1,805                    4,154                 3,471

          Gain/(losses) on sales of securities                -                 213                       61                   224

          Other                                           2,507               1,619                    4,494                 3,388
                                                ----------------    ----------------    ---------------------    ------------------
                    Total Noninterest Income              5,895               4,839                   10,794                 9,418
    Noninterest Expense:

          Employee                                        8,309               6,886                   15,714                13,762

          Occupancy                                       1,164                 824                    2,222                 1,723

          Equipment                                       1,245                 985                    2,379                 2,015

          Intangible amortization                           469                 295                      890                   590

          Other                                           3,415               2,873                    5,798                 5,867
                                                ----------------    ----------------    ---------------------    ------------------
                    Total Noninterest Expense            14,602              11,863                   27,003                23,957

    Earnings Before Income Taxes                          7,338               5,821                   13,710                10,891

    Provision for Income Taxes                            1,856               1,495                    3,442                 2,775
                                                ----------------    ----------------    ---------------------    ------------------
    Net Income                                           $5,482              $4,326                  $10,268                $8,116
                                                ================    ================    =====================    ==================










                                                    Three months ended June 30                   Six months ended June 30
                                                    --------------------------                   ------------------------
Average Balance Sheet Data                           2006                2005                   2006                   2005
                                                ----------------    ----------------    ---------------------    ------------------
                                                                                                              
    Gross Loans                                      $1,284,394            $911,109               $1,137,498              $915,978

    Earning Assets                                    1,779,892           1,370,550                1,637,452             1,367,062

    Total Assets                                      2,006,436           1,519,903                1,830,224             1,516,225

    Noninterest Bearing Deposits                        162,782             140,007                  158,138               137,831

    Interest Bearing Deposits                         1,404,511           1,062,596                1,289,434             1,064,552

    Total Interest Bearing Liabilities                1,628,947           1,241,673                1,476,503             1,241,324

    Shareholders' Equity                                197,938             128,394                  180,992               126,290


                                                    Three months ended June 30                   Six months ended June 30
                                                    --------------------------                   ------------------------
Per Share Data                                       2006                2005                   2006                   2005
                                                ----------------    ----------------    ---------------------    ------------------
    Diluted Earnings Per Share                            $0.35               $0.37                    $0.70                 $0.70

    Cash Dividends Per Share                              0.140               0.130                    0.275                 0.260

    Market Value - High                                   19.04               21.62                    19.45                 22.92

    Market Value - Low                                    16.35               17.30                    16.35                 17.81

    Average Outstanding Shares (diluted)             15,772,464          11,751,831               14,750,888            11,649,538


                                                    Three months ended June 30                   Six months ended June 30
                                                    --------------------------                   ------------------------
Key Ratios                                           2006                2005                   2006                   2005
                                                ----------------    ----------------    ---------------------    ------------------
    Return on Average Assets                              1.10%               1.15%                    1.13%                 1.08%
    Return on Average Equity                             11.11%              13.66%                   11.44%                12.96%
    Net Interest Margin                                   3.82%               4.04%                    3.92%                 3.95%
    Efficiency Ratio                                     63.86%              64.20%                   63.42%                66.24%
    Net Overhead to Average Assets                        1.74%               1.87%                    1.79%                 1.93%

Balance Sheet Highlights
As of June 30                                        2006                2005
                                                ----------------    ----------------
    Total Loans (Excluding Loans Held for            $1,551,661            $913,326
    Sale)

    Allowance for Loan Losses                            14,426              11,275

    Total Securities                                    483,735             446,400

    Goodwill and Intangible Assets                      121,963              45,150

    Total Assets                                      2,375,265           1,540,312

    Noninterest Bearing Deposits                        189,168             146,398

    Interest Bearing Deposits                         1,567,387           1,104,036

    Other Borrowings                                    358,734             123,308

    Shareholders' Equity                                239,915             154,973

Other Balance Sheet Data
As of June 30                                        2006                2005
                                                ----------------    ----------------
    Book Value Per Share                                 $13.36              $11.74
    Loan Loss Reserve to Loans                            0.93%               1.23%
    Nonperforming Assets to Total Assets                  0.90%               0.93%

    Outstanding Shares                               17,956,624          13,210,268













Asset Quality
As of June 30                                        2006                2005
                                                ----------------    ----------------
                                                                                
    Loans Past Due 90 Days or More
    and Still Accruing                                     $528                $257

    Non-accrual Loans                                    16,332              12,894

    Other Real Estate Owned                               4,606               1,175
                                                ----------------    ----------------
    Total Nonperforming Assets                          $21,466             $14,326

    Net Charge-offs - YTD                                $1,102                $882
    Net Charge-offs as a % of average loans               0.20%               0.19%





MainSource  Financial  Group,  Inc.,  headquartered in Greensburg,  Indiana,  is
listed  on  the  NASDAQ  National  Market  (under  the  symbol:"MSFG")  and is a
community-focused,  financial holding company with assets of approximately  $2.4
billion. The Company operates 66 offices in 29 Indiana counties,  six offices in
three Illinois  counties,  and six offices in two Ohio counties through its five
banking subsidiaries,  MainSource Bank, Greensburg,  Indiana, MainSource Bank of
Illinois, Kankakee, Illinois, MainSource Bank - Crawfordsville,  Crawfordsville,
Indiana,  MainSource Bank - Hobart, Hobart, Indiana, and MainSource Bank - Ohio,
Troy,  Ohio.  Through its non-banking  subsidiaries,  MainSource  Insurance LLC,
MainSource  Title LLC, and MainSource  Mortgage LLC, the Company and its banking
subsidiaries provide various related financial services.

Forward-Looking Statements
- --------------------------

Except for historical information contained herein, the discussion in this press
release may include  certain  forward-looking  statements  based upon management
expectations. Factors which could cause future results to differ materially from
these  expectations   include  the  following:   general  economic   conditions;
legislative  and  regulatory  initiatives;  monetary and fiscal  policies of the
federal government;  deposit flows; the costs of funds;  general market rates of
interest;  interest  rates on competing  investments;  demand for loan products;
demand for financial  services;  changes in accounting  policies or  guidelines;
changes in the  quality or  composition  of the  Company's  loan and  investment
portfolios;  the Company's ability to integrate acquisitions;  and the impact of
our continuing acquisition strategy.