SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                               (Amendment No. 3)*

                           MAHASKA INVESTMENT COMPANY
                           --------------------------
                                (Name of Issuer)

                                  COMMON STOCK
                         ------------------------------
                         (Title of Class of Securities)

                                    559809108
                                 --------------
                                 (CUSIP Number)

                                December 31, 2002
             -------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule to which this Schedule is filed:

                  [_]      Rule 13d-1(b)
                  [X]      Rule 13d-1(c)
                  [_]      Rule 13d-1(d)

*  The remainder of this cover page shall be filled out for a reporting person's
   initial  filing on this form with respect to the subject class of securities,
   and for any subsequent  amendment  containing  information  which would alter
   disclosure provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                                       1



CUSIP No. 559809108                 SCHEDULE 13G

1.       Name of Reporting Person

         Ames National Corporation

         I.R.S. Identification No. of Above Person (entities only)

         42-1039071

2.       Check the appropriate box if a member of a group

         Not Applicable

3.       SEC Use Only

4.       Citizenship or Place of Organization

         Iowa

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:


5.       Sole Voting Power

         88,000

6.       Shared Voting Power

         0

7.       Sole Dispositive Power

         88,000

8.       Shared Dispositive Power

         0

9.       Aggregate Amount Beneficially Owned by Each Reporting Person

         88,000

10.      Check box if the aggregate amount in Row (9) excludes certain shares

11.      Percent of Class Represented by Amount in Row 9

         2.2%

12.      Type of Reporting Person

         CO


ITEM 1(a).  NAME OF ISSUER.

            Mahaska Investment Company

ITEM 1(b).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES.

            P.O. Box 1104
            Oskaloosa, Iowa 52577


ITEM 2(a).  NAME OF PERSON FILING.

            This  filing  is made  on  behalf  of  Ames  National
            Corporation.

ITEM 2(b).  ADDRESS OF THE PRINCIPAL OFFICES:

            P.O. Box 846
            Ames, Iowa 50010

ITEM 2(c).  CITIZENSHIP.

            Iowa

                                       2


ITEM 2(d).  TITLE OF CLASS OF SECURITIES.

            Common Stock.


ITEM 2(e).  CUSIP NUMBER.

            559809108

ITEM 3.     IF THE STATEMENT IS BEING FILED PURSUANT TO SECTION
            240.13d-1(b), CHECK WHETHER THE PERSON FILING IS A:

            Not Applicable

ITEM 4.     OWNERSHIP.

            (a)   Amount Beneficially Owned:

                  88,000

            (b)   Percent of Class:

                  2.2%

            (c)   (i)   Sole power to vote or direct the vote: 88,000

                  (ii)  Shared power to vote or direct the vote: 0

                  (iii) Sole power to dispose or direct the disposition
                        of: 88,000

                  (iv)  Shared power to dispose or to direct the disposition
                        of: 0

ITEM 5.      OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

             Not Applicable

ITEM 6.      OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF
             OF ANOTHER PERSON.

             Not Applicable

ITEM 7.      IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
             ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
             COMPANY.

             Not Applicable

ITEM 8.      IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

             Not Applicable

ITEM 9.      NOTICE OF DISSOLUTION OF A GROUP.

             Not Applicable

ITEM 10.     CERTIFICATION.

             By signing  below,  I certify that, to the best of my knowledge and
             belief,  the  securities  referred  to above were  acquired  in the
             ordinary  course of business  and were not acquired for the purpose
             of and do not  have the  effect  of  changing  or  influencing  the
             control of the issuer of such  securities  and were not acquired in
             connection with or as a participant in any transaction  having such
             purpose or effect.

                                    SIGNATURE

         After  reasonable  inquiry and to the best of its knowledge and belief,
the  undersigned  certifies that the  information set forth in this statement is
true, complete and correct.

                                                AMES NATIONAL CORPORATION

                                                BY:  /s/ Daniel L. Krieger
                                                --------------------------------
                                                Name:  Daniel L. Krieger
                                                Title:

Date:    February 14, 2003

                                       3