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): October 26, 2005

                        MainSource Financial Group, Inc.
             (Exact name of registrant as specified in its charter)

         Indiana                         0-12422                35-1562245
State or Other Jurisdiction of      Commission File No.       I.R.S. Employer
Incorporation or Organization                             Identification Number

                               201 North Broadway
                            Greensburg, Indiana 47240
                    (Address of principal executive offices)

                                 (812) 663-0157
                         (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:

     [x] 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))






Item 7.01.             Regulation FD Disclosure

On October 26, 2005,  MainSource  Financial  Group,  Inc. issued a press release
announcing that it had executed a definitive agreement to merge HFS Bank, F.S.B.
into a wholly-owned  subsidiary of MainSource  Financial  Group,  Inc. The press
release is attached  hereto as an exhibit to this Current Report on Form 8-K and
is incorporated by reference.

Item 9.01.             Financial Statements and Exhibits

    (c)  The following exhibit is furnished with this report:

         Exhibit No.       Description

         99.1              MainSource Financial Group, Inc.'s press release
                           dated October 26, 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.

                                            MAINSOURCE FINANCIAL GROUP, INC.

Date:    October 26, 2005                   By:  /s/ James M. Anderson
                                                 ---------------------
                                                 James M. Anderson
                                                 Administrative Vice President