Securities and Exchange Commission
                             Washington, D.C. 20579


                                    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) - September 30, 1999

                           MAHASKA INVESTMENT COMPANY

             (Exact name of registrant as specified in its charter)


     Iowa                         0-24630                42-1003699
     (State of other              (Commission           (IRS Employer
     jurisdiction of              File Number)          Identification No.)
     incorporation)


     222 First Avenue East, Oskaloosa, Iowa             52577
     (Address of principal executive offices)           (Zip Code)


       Registrant's telephone number, including area code: (515) 673-8448


Item 2.  Acquisition or Disposition of Assets

Effective September 30, 1999, Mahaska Investment Company (the Company) completed
its acquisition of Midwest Bancshares, Inc. (Midwest). Midwest is a $165,000,000
thrift  holding  company  headquartered  in  Burlington,  Iowa and is the parent
company of Midwest Federal Savings and Loan Association of Eastern Iowa (Midwest
Federal).  Under the terms of the  transaction,  Midwest  shareholders  received
1,105,348 shares of the Company's common stock in a tax-free exchange  accounted
for as a purchase transaction. Midwest Federal became a wholly- owned subsidiary
of the Company and will retain the Midwest Federal name.

The terms of the  Agreement  and Plan of Merger (the Merger)  dated  February 2,
1999,  are  incorporated  by  reference  to  the  information  contained  in the
Registration  Statement No. 333- 79291 on Form S-4, as filed in connection  with
the Merger.

Item 7. Financial Statements and Exhibits

(a)      Financial Statements

     The Company hereby  incorporates by reference to Midwest's Annual Report on
Form 10-KSB for the year ended December 31, 1998 the Consolidated Balance Sheets
of Midwest as of December 31, 1998 and 1997 and Midwest's Consolidated Statement
of Operations,  Consolidated Statement of Stockholders' Equity and Comprehensive
Income,  and  Consolidated  Statement of Cash Flows for each of the years in the
three-year period ended December 31, 1998.

(b)      Pro forma Financial Information

     The following pro forma financial  information  giving effect to the Merger
is submitted  herewith and is attached as Exhibit 99.1 to this Current Report on
Form 8-K.

     (i)  Pro forma Condensed  Consolidated  Statement of Financial Condition as
          of June 30, 1999.

     (ii) Pro forma  Condensed  Consolidated  Statements  of Income  for the six
          months ended June 30, 1999 and 1998.

     (iii)Pro forma  Condensed  Consolidated  Statement  of Income  for the year
          ended December 31, 1998.

(c)      Exhibits

         Exhibit No.              Exhibit

          (23)                    Consent of Independent Auditors KPMG LLP.

          (99.1)                  Pro Forma Financial Information.


                                    SIGNATURE

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.

                                           Mahaska Investment Company

                                           By: /s/ David A. Meinert

                                           Name: David A. Meinert
                                           Title:  Executive Vice President
                                                   and Chief Financial Officer

Date:   October 14, 1999