FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
S-8, 1998-05-19
STATE COMMERCIAL BANKS
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<PAGE>

       As filed with the Securities and Exchange Commission on May 19, 1998.
                               Registration No. 333-
- -------------------------------------------------------------------------------
                         SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C. 20549
                             ---------------------------
                                      FORM S-8
                               REGISTRATION STATEMENT
                                       Under
                             The Securities Act of 1933
                             ---------------------------
                         FIRST INTERSTATE BANCSYSTEM, INC.
               (Exact Name of Registrant as Specified in its Charter)
                             ---------------------------
                MONTANA                                81-0331430
    (State or Other Jurisdiction of     (I.R.S. Employer Identification Number)
     Incorporation or Organization)

           401 NORTH 31ST STREET
             BILLINGS, MONTANA                        59101
  (Address of Principal Executive Offices)         (Zip Code)
                             ---------------------------
   SAVINGS AND PROFIT SHARING PLAN FOR EMPLOYEES OF FIRST INTERSTATE BANCSYSTEM,
                           INC., AS AMENDED AND RESTATED,
    FIRST INTERSTATE BANCSYSTEM, INC. STOCK OPTION AND STOCK APPRECIATION RIGHTS
                               PLAN, AS AMENDED, AND
           FIRST INTERSTATE BANCSYSTEM, INC. EMPLOYEE STOCK PURCHASE PLAN

                             (Full Titles of the Plans)
                             ---------------------------
                                  Terrill R. Moore
                 Senior Vice President and Chief Financial Officer
                         FIRST INTERSTATE BANCSYSTEM, INC.
                               401 North 31st Street
                              Billings, Montana  59101
                      (Name and Address of Agent for Service)

                                   (406) 255-5300
           (Telephone Number, Including Area Code, of Agent for Service)
                             ---------------------------
                                   With Copy to:

                                 Holland & Hart LLP
                         215 South State Street, Suite 500
                           Salt Lake City, UT  84111-2346
                                   (801) 595-7800
                       ATTENTION:  DAVID G. ANGERBAUER, ESQ.
- -------------------------------------------------------------------------------


<PAGE>

                         CALCULATION OF REGISTRATION FEE
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------



<TABLE>
<CAPTION>
                                             Proposed    Proposed
                                              Maximum     Maximum
                                   Amount    Offering    Aggregate   Amount of
Title of Each Class of             to be     Price Per   Offering   Registration
 Securities to be Registered(1) Registered(2) Share(3)     Price         Fee
- --------------------------------------------------------------------------------
<S>                             <C>          <C>        <C>         <C>
Common Stock,
    no par value. . . . . . . .   500,000      $27.50   $13,750,000   $4,057

TOTAL . . . . . . . . . . . . .   500,000      $27.50   $13,750,000   $4,057
- --------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

</TABLE>

1.   Pursuant to Rule 416(a) under the Securities Act of 1933, as amended 
(the "Securities Act"), this Registration Statement shall also cover any 
additional shares of the Registrant's Common Stock, no par value, which are 
issued or become issuable under the First Interstate BancSystem, Inc. Stock 
Option and Stock Appreciation Rights Plan, as amended, the Savings and Profit 
Sharing Plan for Employees of First Interstate BancSystem, Inc., as amended 
and restated, and the First Interstate BancSystem, Inc. Employee Stock 
Purchase Plan to prevent dilution resulting from any stock dividend, stock 
split, recapitalization or other similar transaction.

2    In addition, pursuant to Rule 416(c) under the Securities Act, this 
Registration Statement also covers an indeterminate amount of interests to be 
offered or sold pursuant to the Savings and Profit Sharing Plan for Employees 
of First Interstate BancSystem, Inc., as amended and restated, described 
herein.

3    Calculated in accordance with Rule 457(h) under the Securities Act, 
based upon the weighted average exercise price of $15.36 per share for 
135,280 shares of Common Stock which may be issued in connection with 
outstanding but unexercised options under the First Interstate BancSystem, 
Inc. Stock Option and Stock Appreciation Rights Plan, as amended; and based 
upon the latest appraised value of $32.00 per share for 364,720 shares 
reserved for issuance under the First Interstate BancSystem, Inc. Stock 
Option and Stock Appreciation Rights Plan, as amended, the Savings and Profit 
Sharing Plan for Employees of First Interstate BancSystem, Inc., as amended 
and restated, and the First Interstate BancSystem, Inc. Employee Stock 
Purchase Plan.

                                      2

<PAGE>

                                   PART II

Item 3.        INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE.

     The following documents filed by First Interstate BancSystem, Inc. (the 
"Registrant") and the Savings and Profit Sharing Plan for Employees of First 
Interstate BancSystem, Inc., as amended and restated (the "Savings Plan"), 
with the Securities and Exchange Commission are hereby incorporated by 
reference in this Registration Statement:

     (a)  The Registrant's latest Annual Report, filed pursuant to Section 
15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange 
Act"), on Form 10-K, for the fiscal year ended December 31, 1997.

     (b)  The Savings Plan's latest Annual Report, filed pursuant to Section 
15(d) of the Exchange Act, on Form 11-K, for the fiscal year ended December 
31, 1996.

     (c)  The Registrant's Quarterly Report on Form 10-Q for the three months 
ended March 31, 1998.

     (d)  All documents filed subsequent hereto by the Registrant and the 
Savings Plan, pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange 
Act, prior to the filing of a post-effective amendment which indicates that 
all securities offered have been sold or which deregisters all securities 
then remaining unsold.

     The consolidated financial statements of the Registrant as of December 
31, 1997 and 1996, and for each of the years in the three-year period ended 
December 31, 1997, that are included in the Registrant's Annual Report on 
Form 10-K for the year ended December 31, 1997, incorporated by reference in 
this Registration Statement, and the financial statements of the Savings Plan 
as of and for the year ended December 31, 1996, that are included in the 
Savings Plan's Annual Report on Form 11-K for the year ended December 31, 
1996, incorporated by reference in this Registration Statement, have been 
audited by KPMG Peat Marwick LLP, independent certified public accountants, 
as stated in their reports, which are incorporated herein by reference.  Such 
financial statements are incorporated herein in reliance upon the reports of 
KPMG Peat Marwick LLP, incorporated by reference herein, pertaining to such 
financial statements and upon the authority of such firm as experts in 
accounting and auditing.

Item 4.        DESCRIPTION OF SECURITIES.

     The authorized capital stock of the Registrant consists of 20,000,000 
shares of common stock without par value (the "Common Stock"), of which 
8,021,906 shares were outstanding as of March 31, 1998, and 100,000 shares of 
preferred stock without par value, none of which were outstanding as of March 
31, 1998.

COMMON STOCK

     Each share of the Common Stock is entitled to one vote in the election 
of directors and in all other matters submitted to a vote of shareholders. 
Accordingly, holders of a majority of the shares of Common Stock entitled to 
vote in any election of directors may elect all of the directors standing for 
election if they choose to do so, subject to the rights of the holders of the 
preferred stock.  Voting for directors is noncumulative.

                                      3

<PAGE>

     Subject to the preferential rights of any preferred stock that may at 
the time be outstanding, each share of Common Stock has an equal and ratable 
right to receive dividends when, if and as declared by the Board of Directors 
out of assets legally available therefor.  In the event of a liquidation, 
dissolution or winding up of the Registrant, the holders of Common Stock will 
be entitled to share equally and ratably in the assets available for 
distribution after payments to creditors and to the holders of any preferred 
stock that may at the time be outstanding.  Holders of Common Stock have no 
conversion rights or preemptive or other rights to subscribe for any 
additional shares of Common Stock or for other securities.  All outstanding 
Common Stock is fully paid and non-assessable.

     The Common Stock of the Registrant is not actively traded, and there is 
no established trading market for the stock.  There is only one class of 
Common Stock, with approximately 93% of the shares subject to contractual 
transfer restrictions set forth in shareholder agreements (as described 
below) and approximately 7% held by 13 shareholders without such 
restrictions.  The Registrant has the right of first refusal to purchase the 
restricted stock at the minority appraised value per share based on the most 
recent quarterly appraisal available to the Registrant.  All stock not 
subject to such restrictions may be sold at a price per share that is 
acceptable to the shareholder.

     The appraised minority value of the Common Stock represents the 
estimated fair market valuation of a minority block of such stock, taking 
into account adjustments for the lack of marketability of the stock and other 
factors.  This value does not represent an actual trading price between a 
willing buyer and seller of the Common Stock in an informed, arm's-length 
transaction.  As such, the appraised minority value is only an estimate as of 
a specific date, and there can be no assurance that such appraisal is an 
indication of the actual value holders of the Common Stock may realize with 
respect to shares held by them.  Moreover, the estimated fair market value of 
the Common Stock may be materially different at any date other than the 
valuation dates indicated above.

     Resale of the Common Stock may be restricted pursuant to the Securities 
Act of 1933, as amended, and applicable state securities laws.  In addition, 
most shares of the Common Stock are subject to one of two shareholders' 
agreements. Members of the Scott family, as majority shareholders of the 
Registrant, are subject to a shareholder's agreement ("Scott Agreement").  
The Scott family, under the Scott Agreement, has agreed to limit the transfer 
of shares owned by members of the Scott family to family members or 
charities, or with the Registrant's approval, to the Registrant's officers, 
directors, advisory directors, or to the Savings Plan.

     Shareholders of the Registrant who are not Scott family members, with 
the exception of 13 shareholders who own an aggregate of approximately 
600,000 shares of unrestricted stock, are subject to a different form of 
shareholder's agreement ("Shareholder's Agreement").  The Shareholder's 
Agreement grants the Registrant the option to purchase Common Stock in any of 
the following events: 1) the shareholder's intention to sell the stock, 2) 
the shareholder's death, 3) transfer of the stock by operation of law, 4) 
termination of the shareholder's status as a director, officer or employee of 
the Registrant, and 5) total disability of the shareholder.  Stock subject to 
the Shareholder's Agreement may not be sold or transferred by the shareholder 
without triggering the Registrant's option to acquire the stock in accordance 
with the terms of the Shareholder's Agreement.  In addition, the 
Shareholder's Agreement allows the Registrant to repurchase any of the Common 
Stock acquired by the shareholder after January 1, 1994 if the Registrant 
determines that the number of shares owned by the shareholder is excessive in 
view of a number of factors including but not limited to (a) the relative 
contribution of 

                                      4

<PAGE>

the shareholder to the economic performance of the Registrant, (b) the effort 
being put forth by the shareholder, and (c) the level of responsibility of 
the shareholder.

     Purchases of the Common Stock made through the Savings Plan are not 
restricted by the Shareholder's Agreement, due to requirements of ERISA and 
the Internal Revenue Code.  However, since the Savings Plan does not allow 
distributions "in kind," any distributions from an employee's account in the 
Savings Plan will allow, and may require, the Savings Plan trustee to sell 
the Common Stock.  While the Registrant has no obligation to repurchase the 
Common Stock, it is possible that the Registrant will repurchase the Common 
Stock sold out of the Savings Plan.  Any such repurchases would be upon terms 
set by the Savings Plan trustee and accepted by the Registrant.

     The Savings Plan, which owns shares of Common Stock, is administered by 
the Trust Department of First Interstate Bank in Montana ("FIB Montana") a 
subsidiary of the Registrant, which votes the shares based on the 
instructions of each participant therein.  In the event such participant does 
not provide the Savings Plan Trustee with instructions, such Trustee will 
vote those shares in accordance with voting instructions received from a 
majority of the participants in the Savings Plan.

DIVIDENDS

It is the policy of the Registrant to pay a dividend to all holders of the 
Common Stock on a quarterly basis.  Dividends are declared and paid in the 
month following the calendar quarter and the amount has historically been 
determined based upon a percentage of net income for the calendar quarter 
immediately preceding the dividend payment date.  Effective with the dividend 
for the fourth quarter of 1995 paid in January 1996, the dividend has been 
30% of quarterly net income.  The Board of Directors of the Registrant has no 
current intention to change its dividend policy, but no assurance can be 
given that the Board may not, in the future, change or eliminate the payment 
of dividends.

DIVIDEND RESTRICTIONS

The holders of Common Stock will be entitled to dividends when, as and if 
declared by the Registrant's Board of Directors out of funds legally 
available therefor.  As a holding company, the Registrant is a corporation 
separate and apart from its bank subsidiaries, FIB Montana and First 
Interstate Bank in Wyoming (together, the "Banks").  The Registrant's ability 
to pay dividends to its stockholders is dependent upon the cash dividends and 
interest payments received by the Registrant from the Banks.  Dividend and 
interest payments from the Banks are subject to federal and state banking 
limitations, generally based on current and retained earnings, imposed by the 
various federal and state regulatory agencies with authority over the 
respective Banks.  Payment of dividends by the Banks is also subject to each 
respective Bank's profitability, financial condition, capital expenditures 
and cash flow requirements.  Payment of dividends and interest may also be 
restricted by applicable banking regulations if such dividends or interest 
would impair the capital of the respective Banks or constitute an "unsafe or 
unsound" practice.  In addition, there are restrictions and financial 
covenants in the Registrant's debt instruments which may prohibit the payment 
of dividends from the Banks to the Registrant and from the Registrant to its 
stockholders in certain circumstances.

                                      5

<PAGE>

PREFERRED STOCK

     The authorized capital stock of the Registrant includes 100,000 shares 
of preferred stock.  The Registrant's Board of Directors is authorized, 
without approval of the holders of the Common Stock, to provide for the 
issuance of preferred stock from time to time in one or more series in such 
number and with such designations, preferences, powers and other special 
rights as may be stated in the resolution or resolutions providing for such 
preferred stock.  The Registrant's Board of Directors may cause the 
Registrant to issue preferred stock with voting, conversion and other rights 
that could adversely affect the holders of the Common Stock to make it more 
difficult to effect a change in control of the Registrant.  

     In the event of any dissolution, liquidation or winding up of the 
affairs of the Registrant, before any distribution or payment may be made to 
the holders of the Common Stock, the holders of preferred stock would be 
entitled to be paid in full with the respective amounts fixed by the 
Registrant's Board of Directors in the resolution or resolutions authorizing 
the issuance of such series, together with a sum equal to the accrued and 
unpaid dividends thereon to the date fixed for such distribution or payment.  
After payment in full of the amount which the holders of preferred stock are 
entitled to receive, the remaining assets of the Registrant would be 
distributed ratably to the holders of the Common Stock.  If the assets 
available are not sufficient to pay in full the amount so payable to the 
holders of all outstanding preferred stock, the holders of all series of such 
shares would share ratably in any distribution of assets in proportion to the 
full amounts to which they would otherwise be respectively entitled.  The 
consolidation or merger of the Registrant into or with any other corporation 
or corporations would not be deemed a liquidation, dissolution, or winding up 
of the affairs of the Registrant.

Item 5.        INTERESTS OF NAMED EXPERTS AND COUNSEL.

     Not applicable.

Item 6.        INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Officers and directors of the Registrant are entitled to indemnification 
under the Montana Business Corporation Act and pursuant to a Resolution of 
the Board of Directors of the Registrant dated January 12, 1987.  A summary 
of the indemnification provision in such resolution follows: 

     Pursuant to a resolution of the Board of Directors dated January 12, 
1987, and under the authority of Section 35-1-414 of the Montana Business 
Corporation Act, the Registrant shall indemnify each director and officer of 
the Registrant (including former officers and directors) and each agent of 
the Registrant serving as a director or officer of a Bank, serving at the 
specific direction or request of the Registrant (but only to the extent that 
such director, officer or agent is not indemnified by the Bank or by 
insurance provided by the Registrant) against judgments, penalties, fines, 
settlements and reasonable expenses actually and reasonably paid by such 
director, officer or agent by reason of the fact that he or she is or was a 
director or officer of the Registrant or such Bank, to the extent provided by 
and subject to the limitations of the Montana Business Corporation Act.

     Officers and directors of the Registrant are also entitled to 
indemnification under the Registrant's Bylaws, a copy of which is included as 
an exhibit hereto.

                                      6

<PAGE>

Item 7.     EXEMPTION FROM REGISTRATION CLAIMED.

     Not applicable.

Item 8.     

     1.   EXHIBITS.

Regulation S-K
- --------------
 Exhibit                                  Document
 -------                                  --------

    4.1(1)    Restated Articles of Incorporation of the Registrant dated 
              February 27, 1986

    4.2(2)    Articles of Amendment to Restated Articles of Incorporation of 
              the Registrant dated September 19, 1996

    4.3(2)    Articles of Amendment to Restated Articles of Incorporation of 
              the Registrant dated September 19, 1996

    4.4(3)    Articles of Amendment to Restated Articles of Incorporation of 
              the Registrant dated October 7, 1997

    4.5(4)    Bylaws of the Registrant 

    4.6(5)    Specimen of common stock certificate of First Interstate 
              BancSystem, Inc.

    4.7       Shareholder's Agreement for non-Scott family members

    4.8(6)    Savings and Profit Sharing Plan for Employees of the
              Registrant, as amended December 31, 1994

    4.9(4)    Amendment to the Savings and Profit Sharing Plan for Employees
              of the Registrant, adopted September 21, 1995

    4.10(4)   First Amendment to the Savings and Profit Sharing Plan for
              Employees of the Registrant, dated December 20, 1995

    4.11(4)   Second Amendment to the Savings and Profit Sharing Plan for
              Employees of the Registrant, dated July 18, 1996

    4.12(4)   Third Amendment to the Savings and Profit Sharing Plan for
              Employees of the Registrant, dated September 19, 1996

                                      7

<PAGE>


    4.13(4)   Fourth Amendment to the Savings and Profit Sharing Plan for
              Employees of the Registrant, dated January 16, 1997

    4.14(3)   Fifth Amendment to the Savings and Profit Sharing Plan for
              Employees of the Registrant, dated September 18, 1997

    4.15(1)   Stock Option and Stock Appreciation Rights Plan of the
              Registrant, as amended

    4.16      Employee Stock Purchase Plan of the Registrant, dated May 1,
              1998

    4.17(1)   First Interstate Stockholders' Agreements with Scott family
              members

    4.18(6)   Amendment to First Interstate Stockholders' Agreement with
              Scott family members dated September 7, 1995

    5         Opinion of Holland & Hart LLP, as to the legality of securities
              being registered.

    23.1      Consent of KPMG Peat Marwick LLP,  Independent Certified Public
              Accountants.

    23.2      Consent of Holland & Hart LLP (contained in Exhibit 5).

    24        Power of Attorney (included on page 10 of this Registration
              Statement)

- -----------------------

1    Incorporated by reference to the Registrant's Registration Statement on
     Form S-1, No. 33-84540.

2    Incorporated by reference to the Registrant's Form 8-K dated October 1,
     1996.

3    Incorporated by reference to the Registrant's Registration Statement on
     Form S-1, No. 333-37847.

4    Incorporated by reference to the Registrant's Registration Statement on
     Form S-1, No. 333-25633.

5    Incorporated by reference to the Registrant's Registration Statement on
     Form S-1, No. 333-3250.

6    Incorporated by reference to the Post-Effective Amendment No. 2 to the
     Registrant's Registration Statement on Form S-1, No. 33-84540.

                                      8

<PAGE>

2.   SAVINGS PLAN UNDERTAKING

     The Registrant has submitted the Savings Plan, including all amendments
thereto, to the Internal Revenue Service ("IRS") and has made all changes, if
any, required by the IRS in order to qualify the Savings Plan under the
requirements of the Employee Retirement Income Security Act of 1974, as amended.

Item 9.        UNDERTAKINGS.

     (a)  The undersigned Registrant hereby undertakes:

          (1)  To file, during any period in which offers or sales are being 
          made, a post-effective amendment to this registration statement to 
          include any material information with respect to the plan of 
          distribution not previously disclosed in the registration statement 
          or any material change to such information in the registration 
          statement.

          (2)  That, for the purpose of determining any liability under the 
          Securities Act, each such post-effective amendment shall be deemed 
          to be a new registration statement relating to the securities 
          offered therein, and the offering of such securities at that time 
          shall be deemed to be the initial bona fide offering thereof.

          (3)  To remove from registration by means of a post-effective 
          amendment any of the securities being registered which remain 
          unsold at the termination of the offering.

     (b)  The undersigned Registrant hereby undertakes that, for purposes of 
determining any liability under the Securities Act, each filing of the 
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the 
Exchange Act and each filing of the Savings Plan's annual report pursuant to 
Section 15(d) of the Exchange Act that is incorporated by reference in this 
registration statement shall be deemed to be a new registration statement 
relating to the securities offered therein, and the offering of such 
securities at that time shall be deemed to be the initial bona fide offering 
thereof.

     (c)  Insofar as indemnification for liabilities arising under the 
Securities Act may be permitted to directors, officers and controlling 
persons of the Registrant pursuant to the foregoing provisions, or otherwise, 
the Registrant has been advised that in the opinion of the Securities and 
Exchange Commission such indemnification is against public policy as 
expressed in the Securities Act and is, therefore, unenforceable.  In the 
event that a claim for indemnification against such liabilities (other than 
the payment by the Registrant of expenses incurred or paid by a director, 
officer or controlling person of the Registrant in the successful defense of 
any action, suit or proceeding) is asserted by such director, officer or 
controlling person in connection with the securities being registered, the 
Registrant will, unless in the opinion of its counsel the matter has been 
settled by controlling precedent, submit to a court of appropriate 
jurisdiction the question whether such indemnification by it is against 
public policy as expressed in the Securities Act and will be governed by the 
final adjudication of such issue.

                                      9

<PAGE>



                                 SIGNATURES


1.   REGISTRANT

     Pursuant to the requirements of the Securities Act of 1933, the 
Registrant certifies that it has reasonable grounds to believe that it meets 
all of the requirements for filing on Form S-8 and has duly caused this 
Registration Statement to be signed on its behalf by the undersigned, 
thereunto duly authorized, in the City of Billings, State of Montana, on 
May 18, 1998. 

                                      First Interstate BancSystem, Inc.



                                      /s/ Thomas W. Scott                  
                                      -------------------------------------
                                      Thomas W. Scott
                                      President and Chief Executive Officer

                                 POWER OF ATTORNEY

     KNOW ALL PERSONS by these presents that each person whose signature to 
this Registration Statement appears below hereby constitutes and appoints 
Thomas W. Scott and Terrill R. Moore, and each of them, as his true and 
lawful attorney-in-fact and agent, with full power of substitution, to sign 
on his behalf individually and in the capacity stated below, and to perform 
any acts necessary to be done in order to file all amendments and 
post-effective amendments to this Registration Statement, and any and all 
instruments or documents filed as part of or in connection with this 
Registration Statement or the amendments thereto and each of the undersigned 
does hereby ratify and confirm all that such attorney-in-fact and agent, or 
his substitutes, shall do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, the 
Registration Statement has been signed below by the following persons in the 
capacities indicated on May 18, 1998:

<TABLE>
<CAPTION>

             Signature                Title
             ---------                -----
<S>                               <C>
 /s/ Homer A. Scott, Jr.          Chairman of the Board
- ------------------------------
 Homer A. Scott, Jr.

 /s/ Dan S. Scott                 Director
- ------------------------------
 Dan S. Scott

 /s/ James R. Scott               Vice Chairman of the Board
- ------------------------------
 James R. Scott

 /s/ Randy Scott                  Director
- ------------------------------
 Randy Scott

 /s/ John M. Heyneman             Director
- ------------------------------
 John M. Heyneman

 /s/ Joel Long                    Director
- ------------------------------
 Joel Long

                                      10

<PAGE>


 /s/ James Haugh                  Director
- ------------------------------
 James Haugh

 /s/ Thomas W. Scott              President, Chief Executive Officer and Director
- ------------------------------    (PRINCIPAL EXECUTIVE OFFICER)
 Thomas W. Scott

 /s/ Terrill R. Moore             Senior Vice President, Chief Financial Officer and Secretary
- ------------------------------    (PRINCIPAL FINANCIAL AND ACCOUNTING OFFICER)
 Terrill R. Moore 

</TABLE>


2.   SAVINGS AND PROFIT SHARING PLAN FOR EMPLOYEES OF FIRST INTERSTATE
     BANCSYSTEM, INC., AS AMENDED AND RESTATED

     Pursuant to the requirements of the Securities Act of 1933, the trustee 
has duly caused this Registration Statement to be signed on its behalf by the 
undersigned, thereunto duly authorized, in the City of Billings, State of 
Montana, on May 18, 1998.

                                      Savings and Profit Sharing Plan for 
                                      Employees of First Interstate BancSystem,
                                      Inc., as amended and restated


                                      /s/ Richard C. Fellows
                                      ----------------------------------
                                      By:  Richard C. Fellows
                                      Its:  Trustee

                                      11

<PAGE>

                       FIRST INTERSTATE BANCSYSTEM, INC.

                               EXHIBIT INDEX
Regulation S-K
- --------------
   Exhibit              Document
   -------              --------
    4.1(1)   Restated Articles of Incorporation of the Registrant dated
             February 27, 1986

    4.2(2)   Articles of Amendment to Restated Articles of Incorporation of
             the Registrant dated September 19, 1996

    4.3(2)   Articles of Amendment to Restated Articles of Incorporation of
             the Registrant dated September 19, 1996

    4.4(3)   Articles of Amendment to Restated Articles of Incorporation of
             the Registrant dated October 7, 1997

    4.5(4)   Bylaws of the Registrant

    4.6(5)   Specimen of common stock certificate of First Interstate
             BancSystem, Inc.

    4.7      Shareholder's Agreement for non-Scott family members

    4.8(6)   Savings and Profit Sharing Plan for Employees of the Registrant,
             as amended December 31, 1994

    4.9(4)   Amendment to the Savings and Profit Sharing Plan for Employees
             of the Registrant, adopted September 21, 1995

    4.10(4)  First Amendment to the Savings and Profit Sharing Plan for
             Employees of the Registrant, dated December 20, 1995

    4.11(4)  Second Amendment to the Savings and Profit Sharing Plan for
             Employees of the Registrant, dated July 18, 1996

    4.12(4)  Third Amendment to the Savings and Profit Sharing Plan for
             Employees of the Registrant, dated September 19, 1996

    4.13(4)  Fourth Amendment to the Savings and Profit Sharing Plan for
             Employees of the Registrant, dated January 16, 1997

                                      12

<PAGE>

    4.14(3)  Fifth Amendment to the Savings and Profit Sharing Plan for
             Employees of the Registrant, dated September 18, 1997

    4.15(1)  Stock Option and Stock Appreciation Rights Plan of the
             Registrant, as amended

    4.16     Employee Stock Purchase Plan of the Registrant, dated May 1,
             1998

    4.17(1)  First Interstate Stockholders' Agreements with Scott family
             members

    4.18(6)  Amendment to First Interstate Stockholders' Agreement with Scott
             family members dated September 7, 1995

    5        Opinion of Holland & Hart LLP, as to the legality of securities
             being registered.

    23.1     Consent of KPMG Peat Marwick LLP,  Independent Certified Public
             Accountants.

    23.2     Consent of Holland & Hart LLP (contained in Exhibit 5).

    24       Power of Attorney (included on page 10 of this Registration
             Statement)

- ---------------------------
1    Incorporated by reference to the Registrant's Registration Statement on 
     Form S-1, No. 33-84540.

2    Incorporated by reference to the Registrant's Form 8-K dated October 1, 
     1996.

3    Incorporated by reference to the Registrant's Registration Statement on 
     Form S-1, No. 333-37847.

4    Incorporated by reference to the Registrant's Registration Statement on 
     Form S-1, No. 333-25633.

5    Incorporated by reference to the Registrant's Registration Statement on 
     Form S-1, No. 333-3250.

6    Incorporated by reference to the Post-Effective Amendment No. 2 to the 
     Registrant's Registration Statement on Form S-1, No. 33-84540.

                                      13

<PAGE>



                            SHAREHOLDER'S AGREEMENT

     THIS AGREEMENT is made this _____ day of _________, 1998, by and between 
_____________, herein referred to as "Shareholder", and FIRST INTERSTATE 
BANCSYSTEM, INC., a Montana corporation, 401 North 31st Street, Billings, 
Montana 59101, herein referred to as the "Corporation".

                            W I T N E S S E T H :

     A. Shareholder owns shares of capital stock of the Corporation, which 
stock, together with any additional stock hereafter acquired by Shareholder, 
is herein referred to as the "Shares".

     B. The Corporation desires to restrict the issuance and holding of its 
corporate stock to officers, directors and employees of the Corporation or 
any of its subsidiaries, or to fiduciaries for the benefit of any such 
persons, or to charities. Such persons' status as director, officer or 
employee of the Corporation shall be herein referred to as the "Shareholders' 
Relationship with the Corporation".  This Shareholder's Agreement does not 
apply to the Corporation's stock held in the Savings Plan.

     C. The Corporation and Shareholder desire to obligate each other to 
sell and purchase shares under specified circumstances.

     NOW, THEREFORE, in consideration of the above facts and the 
Shareholder's and the Corporation's mutual promises herein, the Shareholder 
and the Corporation agree as follows:

     1. RESTRICTION ON TRANSFER OR PLEDGE OF SHARES.  Except as otherwise 
provided in this Agreement or as agreed upon in writing by the Shareholder 
and the Corporation, Shareholder shall not transfer or permit to be 
transferred, whether voluntarily, involuntarily or by operation of law, 
resulting from death or otherwise, any or all of the Shares now owned or 
hereafter acquired by Shareholder, and any attempted transfer in violation of 
this Agreement shall be void.  Shareholder shall not encumber or use any 
Shares as security for a loan, except upon the written consent of the 
Corporation.

     2. TRANSFER OF SHARES TO CHARITY.  A Shareholder may transfer Shares to 
any organization described in Section 170(b)(1)(A) of the Internal Revenue 
Code of 1986, as now or hereafter amended (the "Code"), a gift to which 
qualifies as a charitable deduction under Sections 170(c), 2055(a), or 
2522(a) of the Code (a "Charity").  Any transfer of Shares to a Charity shall 
be subject to the Corporation's option, exercisable by action of the Board of 
Directors of the Corporation, to purchase all or any portion of the Shares 
held by a Charity at the purchase price set forth in this Agreement, which 
may be exercised by written notice from the Corporation to the Charity at any 
time.

     3. PURCHASE OPTION UPON BONA FIDE SALE.  If a Shareholder intends to 
sell any Shares to any person other than the Corporation, Shareholder shall 
give ninety (90) days' written notice to the Corporation of the intention to 
sell Shares. The notice, in addition to stating the fact of the intention to 
sell Shares, shall state (i) the 

                                      1

<PAGE>

number of Shares to be sold, (ii) the name and address of the proposed 
purchaser, (iii) the amount of the consideration and the other terms of the 
sale.  At the request of the Corporation, Shareholder shall demonstrate to 
the reasonable satisfaction of the Corporation that the intended sale is bona 
fide.  Within ninety (90) days after the Corporation's receipt of the notice 
of intention to sell Shares, the Corporation may exercise an option to 
purchase all but not less than all of the Shares proposed to be sold.

     4. PURCHASE OPTION UPON DEATH.  Upon Shareholder's death, the 
Corporation, within ninety (90) days after the appointment of a personal 
representative for the deceased Shareholder's estate, for which written 
notice must be given by said personal representative within ten (10) days 
after appointment, may exercise an option to purchase all but not less than 
all of the deceased Shareholder's Shares from the personal representative of 
his or her estate. Shareholder, by signing this Agreement, directs his or her 
personal representatives to open Shareholder's estate promptly in the court 
of proper jurisdiction and execute, procure and deliver all documents, 
including, but not limited to appropriate order of such court and estate and 
inheritance tax waivers, as shall be required to effectuate the purposes of 
this Agreement.

     5. PURCHASE OPTION UPON INVOLUNTARY TRANSFER.  If other than by reason 
of Shareholder's death, Shares are transferred by operation of law to any 
person other than the Corporation (such as but not limited to a shareholder's 
trustee in bankruptcy, a purchaser at any creditor's or court sale or the 
guardian or conservator of an incompetent shareholder), Shareholder shall 
immediately give written notice to the Corporation of such transfer.  The 
Corporation, within ninety (90) days of the Corporation's receipt of actual 
notice of the transfer, may exercise an option to purchase all but not less 
than all of the Shares so transferred from the transferee of the Shares.  Any 
transfer of the Shares by operation of law shall be subject to this right and 
option of the Corporation to purchase the Shares.

     6. PURCHASE OPTION UPON TERMINATION OF RELATIONSHIP WITH THE 
CORPORATION. Upon the termination of Shareholder's Relationship with the 
Corporation, such termination being for any reason whatsoever, including but 
not limited to the voluntary resignation of Shareholder, the Corporation, 
within ninety (90) days after the date of such termination, may exercise an 
option to purchase all but not less than all of the Shares owned by the 
terminated Shareholder at the time of such termination.

     7. PURCHASE OPTION UPON DISABILITY.  If Shareholder shall become totally 
disabled, the Corporation, within ninety (90) days after the date of such 
total disability, may exercise an option to purchase all but not less than 
all of the Shares owned by the disabled Shareholder at the time of the 
commencement of his or her total disability.  A shareholder shall be deemed 
totally disabled within the meaning of this paragraph 7 if as a result of 
sickness, accident or injury, he or she becomes wholly and continuously 
unable to perform his or her duties for a period of six consecutive months, 
and his or her disability shall be deemed to have commenced at the end of 
said six-month period.

                                      2

<PAGE>

     8. GENERAL CORPORATE PURCHASE OPTION. Upon determination by the 
Corporation's Board of Directors that the number of Shares held by 
Shareholder is excessive in view of the Corporation's policy that the level 
of a shareholder's stock ownership should reflect certain factors, including 
but not limited to (a) the relative contribution of Shareholder to the 
economic performance of the Corporation, (b) the effort being put forth by 
Shareholder, and (c) the level of responsibility of Shareholder, the 
Corporation may exercise an option to purchase a portion of Shareholder's 
Shares sufficient to decrease the number of Shares owned by the Shareholder 
to an amount that the Board of Directors, in its sole discretion, believes is 
appropriate.  The Corporation shall not exercise said option in anticipation 
of a sale of the Corporation or a majority of the Corporation's stock and the 
Corporation agrees to exercise said option in a nondiscriminatory fashion.  
The number of Shares that the Corporation can purchase from Shareholder is 
limited to the stock obtained by the Shareholder after January 1, 1994.

     9. EXERCISE OF OPTION. The Corporation shall exercise any of the Options 
granted in paragraphs 3, 4, 5, 6, or 7 by delivering written notice of its 
exercise of the option, within the time provided in the applicable paragraph, 
to the Shareholder in the case of a paragraph 3 option, to the personal 
representative of Shareholder's estate in the case of a paragraph 4 option, 
to the transferee in the case of a paragraph 5 option, to the terminated 
Shareholder in the case of a paragraph 6 option, and to the disabled 
shareholder in the case of a paragraph 7 option.  The Corporation shall 
exercise the option granted in paragraph 8 by delivering written notice of 
its exercise of the option, specifying the number of Shares to be purchased, 
to the Shareholder.

     10. EFFECT OF NON-EXERCISE OF OPTIONS. If the purchase options are 
forfeited or not exercised in compliance with the terms of this Agreement, 
then the Shares to which the option applied shall be unrestricted and no 
longer subject to the terms of this Agreement.

      11. THE PURCHASE PRICE. The purchase price for each Share purchased 
pursuant to any of the options granted in this Agreement shall be the 
appraised value of a minority Share as stated in the most recent quarterly 
appraisal available to the Corporation. The Corporation's Shares shall be 
appraised as of the last day of each calendar quarter by an unaffiliated firm 
qualified to make such an appraisal, as determined by the Corporation's Board 
of Directors.  The expense of determining the appraised value shall be borne 
by the Corporation.  The appraisal of the Shares delivered to any department 
division or subsidiary of the Corporation may be utilized under this 
paragraph.

     The Corporation may, at its option, withhold any amount that the 
Shareholder owes the Corporation or its subsidiaries from the amount of the 
Purchase Price payable to Shareholder and apply said amount to such 
indebtedness.

                                      3

<PAGE>

     12. PAYMENT OF THE PURCHASE PRICE.

     12.1 PAYMENT TERMS.  The purchase price for Shares to be purchased by 
the Corporation pursuant to this Agreement shall be paid either in cash at 
closing or, at Shareholder's (including the personal representative of a 
deceased Shareholder) election, in installments as follows:

          (a)  25% of the purchase price at the closing.

          (b)  The balance of the purchase price in three (3) annual equal 
               payments of principal plus accrued interest thereon at a fixed 
               annual rate equal to the 5 year Treasury Note rate at the date 
               of closing plus one percent, the first installment to be paid one
               year after the closing, and the remaining installments each year 
               thereafter. 

The purchase price pursuant to exercise of the paragraph 5 option shall be 
paid in full in cash at the closing.

     12.2 PROMISSORY NOTE ON DEFERRED PORTION.  The deferred portion of the 
purchase price, if any, shall be evidenced by the promissory note of the 
Corporation made payable to the order of the Shareholder.  The Corporation 
note shall be  substantially in the form of that set forth in Exhibit A.

     13. THE CLOSING.

     13.1 TIME AND PLACE.  Unless otherwise agreed by the parties, the 
closing of the sale and purchase of Shares, as provided in this Agreement, 
shall take place at the general offices of the Corporation.  In the case of a 
purchase of Shares from a deceased Shareholder's estate under paragraph 4, 
the closing shall take place within one hundred twenty (120) days after the 
appointment of a personal representative for the deceased Shareholder's 
estate.  In the case of a purchase of Shares under paragraphs 3, 5, 6, 7, or 
8, the closing shall take place ten (10) days after the delivery to the 
Shareholder of written notice by the Corporation of its exercise of the 
option to purchase the Shareholder's Shares.

     13.2 DOCUMENTS.  At the closing of the sale and purchase, the 
Shareholder and the Corporation shall execute and immediately deliver to each 
other the various documents which shall be required to carry out their 
undertakings hereunder, including but not limited to the payment of cash, the 
execution and delivery of notes and the assignment and delivery of stock 
certificates free and clear of all taxes, debts, claims, judgments, liens or 
encumbrances whatsoever.

     14. LEGEND ON CERTIFICATES.  All Shares now or hereafter owned by 
Shareholder shall be subject to the provisions of this Agreement and 
Shareholder, and his or her transferee or successor agrees that the 
certificates representing same shall bear the following legend reciting the 
existence of the Agreement:

     The sale, transfer or encumbrance of this certificate is subject to an 
     agreement to restrict transfer or acquisition of the shares.  A copy of the

                                      4

<PAGE>

     agreement is on file in the office of the secretary of the 
     Corporation. Any transfer or acquisition in violation of the agreement 
     is null and void. 

Upon the execution of this Agreement, Shareholders shall immediately 
temporarily surrender his or her stock certificates to the Corporation and 
the Corporation shall cause the above legend to be placed thereupon before 
returning the certificates.

     15. REISSUED SHARES.  The Corporation shall have the right to substitute 
or reissue stock in exchange for the Shares in the event of a stock split, 
merger, consolidation, name change, sale, spin off, share exchange, or other 
corporate reorganization. Substituted or reissued stock shall be subject to 
the terms of this Agreement.

     16. TERMINATION.

     16.1 EVENTS CAUSING TERMINATION. This Agreement and all restrictions on 
stock transfer created hereby shall be effective as of the date hereof and 
shall terminate on the occurrence of the bankruptcy, receivership or 
dissolution of the Corporation, on the public trading of the Shares, or on 
the execution of a written instrument by the Corporation and the party or 
parties who then own Shares subject to this Agreement which terminates the 
same.

     16.2 SURVIVAL OF RIGHTS AND REMEDIES. The termination of this Agreement 
for any reason shall not affect any right or remedy existing hereunder prior 
to the effective date of termination hereof.

     17. GENERAL PROVISIONS.

     17.1 REMEDIES.  The parties agree that they will not have an adequate 
remedy at law for the breach of this Agreement because, among other reasons, 
the Shares cannot readily be purchased or sold on the open market.  The 
parties shall have available for any breach of this Agreement the remedies of 
specific performance and injunctive relief, together with all other remedies 
at law or in equity.  No waiver of or forbearance to enforce any right or 
provision hereof shall be binding unless in writing and signed by the party 
to be bound, and no such waiver or forbearance in any instance shall apply to 
any other instance or any other right or provision.

     17.2 MODIFICATION OR TERMINATION.  This Agreement may not be modified or 
terminated orally, and no modification, termination, or amendment shall be 
valid unless in writing signed by all parties hereto.

     17.3 GOVERNING LAW.  This Agreement shall be governed for all purposes 
by the laws of the State of Montana.

     17.4 SEVERABILITY.  Each term and provision of this Agreement is 
intended to be enforced to the maximum extent permitted by applicable law.  
If any term or provision of this Agreement or the applicability thereof to 
any person or circumstances shall to any extent be invalid or unenforceable, 
the remainder of this Agreement, or the application of such term or provision 
to persons or circumstances other than those as to which it is held invalid 
or unenforceable, shall not be affected thereby and shall continue in full 
force and effect.

                                      5

<PAGE>

     17.5 NOTICES.  All notices provided for by this Agreement shall be made 
in writing and shall be given either: (1) by actual delivery of the notice to 
the party entitled thereto; or (2) by mailing the notice in the U.S. mails, 
certified mail, return receipt requested to the last known address of the 
party entitled thereto. The notice shall be deemed to be received in case 
(1), on the date of its actual receipt by a party and in case (2), on the 
date of its mailing.  Any notice to be given by Shareholder shall be given on 
the form of notice attached hereto as Exhibit B.

     17.6 BINDING EFFECT.  This Agreement is binding upon and inures to the 
benefit of the Corporation and the Shareholder and their respective heirs, 
personal representatives, successors and assigns. 

     17.7 TIME.  Time shall be of the essence of this Agreement.

     17.8 HEADINGS.  The headings used herein are for convenience only, and 
shall not be construed as a part of this Agreement or as a limitation on the 
scope of the particular paragraphs to which they refer.

     17.9 ENTIRE AGREEMENT.  This Agreement contains the entire agreement and 
understanding of the parties, and supersedes any and all prior negotiations 
and understandings.  

     IN WITNESS WHEREOF, the parties have executed this Agreement on the date 
set forth on page 1.

                                     FIRST INTERSTATE BANCSYSTEM, INC.


                                     By ______________________________
                                        Terrill R. Moore, Secretary


                                            "Corporation"




____________________________
      "Shareholder"



                                      6

<PAGE>




                                   EXHIBIT A



$_____________                                            (Date)
                                                     -----------------
                                                     Billings, Montana


                                 PROMISSORY NOTE

     FOR VALUE RECEIVED, the undersigned promises to pay to the order of 
_____ ______, at _________________, or such other place as is designated from 
time to time by the holder of this note, in lawful money of the United 
States, the sum of ________________________________________________________ 
($_________) in the following manner:


     $_________ (including principal and interest) on ________, ____, and a 
     like sum on the same day of each succeeding year thereafter until the 
     full amount due hereunder has been paid.

     Each payment shall be applied first to accrued interest on the entire 
     outstanding principal balance from time to time at the rate of ____% per 
     annum from the date hereof and then to principal.  The undersigned may 
     not make advance payments on principal.

     Any installment of principal or interest payable hereunder, or any part 
thereof, which is not paid when due, shall thereafter bear interest at the 
rate equal to six percent (6%) over the interest rate stated above.

     If any payment due hereunder remains unpaid for more than thirty (30) 
days after it is due, the holder hereof may, at its option, declare the 
entire unpaid balance of principal and interest hereunder to be immediately 
due and payable.

     Waiver by the holder hereof of any default by the undersigned shall not 
constitute a waiver by the holder of a subsequent default.  Failure by the 
holder to exercise any right, power or privileges which it may have by reason 
of a default by the undersigned shall not preclude the exercise of such 
right, power or privilege so long as such default remains uncured or if a 
subsequent default occurs.

     The undersigned agrees to pay all costs of collection, including a 
reasonable attorney's fee, if this note is placed in the hands of an attorney 
for collection after default, and hereby waives demand, presentment for 
payment, protest, notice of protest, and notice of dishonor.

     Words used in the singular herein shall include the plural.

                                       FIRST INTERSTATE BANCSYSTEM, INC.

                                       By:
                                          --------------------------------

                                       Its:
                                          --------------------------------




<PAGE>

                                    EXHIBIT B


                                     NOTICE

To:   First Interstate BancSystem, Inc.
      401 North 31st Street
      Billings, MT  59101


      Pursuant to the Shareholder's Agreement between 
________________________ ("Shareholder") and First Interstate BancSystem, 
Inc. ("Corporation") dated ______________, the undersigned hereby gives 
notice of:

(Check One)


     _____  The undersigned shareholder's intention to sell Shares as follows:


            -  Number of Shares:     ____________
            -  Proposed Purchaser
               and Address:          __________________________
                                     __________________________
                                     __________________________
            -  Consideration:        __________________________
            -  Terms of Sale:        __________________________



     _____  The appointment of the undersigned as personal representative of 
Shareholder's Estate on __________________________.  A true and correct copy 
of the personal representative letters issued to the undersigned is attached 
hereto.

     _____  The involuntary transfer of Shareholder's Shares


Dated: ______________________________________

                                    __________________________________



<PAGE>


              ADDENDUM TO SHAREHOLDER'S AGREEMENT DATED           , BETWEEN
                                    , SHAREHOLDER, AND FIRST INTERSTATE
                           BANCSYSTEM, INC., CORPORATION


THIS AGREEMENT is made this ____ day of _________________, 19__, by and 
between _______________________________, herein referred to as "Shareholder", 
___________________________, herein referred to as "Fiduciary", and FIRST 
INTERSTATE BANCSYSTEM, INC., a Montana corporation, herein referred to as the 
"Corporation", as an addendum to the Shareholder's Agreement dated 
_______________, by and between Shareholder and the Corporation, herein 
referred to as the "Shareholder's Agreement."

                              W I T N E S S E T H:

     A.  Shareholder's Shares are held by Fiduciary for the benefit of 
Shareholder.

     B.  Shareholder and the Corporation desire to bind Fiduciary to the 
terms and conditions of the Shareholder's Agreement.

     NOW, THEREFORE, the parties agree as follows:

     1.   FIDUCIARY TO BE BOUND BY SHAREHOLDER'S AGREEMENT.  The parties 
agree that Fiduciary, as custodian of or trustee over Shareholder's Shares, 
is bound by the terms and conditions of the Shareholder's Agreement and is 
obligated to manage and control said Shares in accordance with the 
restrictions and obligations of the Shareholder's Agreement.

     2.   RATIFICATION OF SHAREHOLDER'S AGREEMENT.  The parties agree that 
except as modified herein, the terms and conditions of the Shareholder's 
Agreement are hereby confirmed and ratified.

     IN WITNESS WHEREOF, the parties have executed this agreement on the date 
set forth above.

                                       FIRST INTERSTATE BANCSYSTEM, INC.


                                       By: _________________________________
                                           Terrill R. Moore, Secretary



                                                 "CORPORATION"

________________________________
       "SHAREHOLDER"


By: ____________________________

Its: ___________________________

           "FIDUCIARY"




<PAGE>


                         FIRST INTERSTATE BANCSYSTEM, INC.

                            EMPLOYEE STOCK PURCHASE PLAN

                                SECTION 1.   PURPOSE

     The purpose of the First Interstate BancSystem, Inc. Employee Stock 
Purchase Plan (the "Plan") is to further the growth and development of First 
Interstate BancSystem, Inc., a Montana corporation (the "Company"), by 
affording an opportunity for stock ownership to selected persons, including 
the Savings and Profit Sharing Plan Trustee (as defined below).

                              SECTION 2.   DEFINITIONS

     Unless otherwise indicated, the following terms when used herein shall 
have the following meanings: 

          a.   "Affiliate" shall mean, with respect to any person or entity, 
a person or entity that directly or indirectly through one or more 
intermediaries, controls, or is controlled by, or is under common control 
with, such person or entity.

          b.   "Board of Directors" shall mean the Board of Directors of the 
Company. 

          c.   "Code" shall mean the Internal Revenue Code of 1986, as 
amended. 

          d.   "Committee" shall have the meaning set forth in Section 4.1 
hereof.

          e.   "Common Stock" shall mean the Company's no par value common 
stock, and any share or shares of the Company's capital stock hereafter 
issued or issuable in substitution for such shares.  

          f.   "Director" shall mean a member of the Board of Directors, a 
member of the board of directors of any bank Subsidiary of the Company, and 
advisory directors of the Company or any such Subsidiary.  

          g.   "Offer Letter" shall have the meaning set forth in Section 7.2 
hereof.

          h.   "Offering Period" shall have the meaning set forth in Section 
7.6 hereof.

          i.   "Participant" shall mean any person, including the Savings 
Plan Trustee, who is granted a right to purchase Common Stock under the Plan; 
provided however, that such person shall be considered a Participant only 
during a particular Offering Period, if and when designated by the Board of 
Directors or Committee and will 

<PAGE>

not be considered a Participant in prior or subsequent Offering Periods 
unless designated as such by the Board of Directors or Committee.  
"Participant" shall also mean the personal representative of a Participant 
and any other person who acquires the right to purchase Common Stock by 
bequest or inheritance.

          j.   "Purchase Price" shall mean the Fair Market Value of the 
Common Stock as of the first day of an Offering Period.

          k.   "Fair Market Value" shall have the meaning set forth in 
Section 7.5 hereof.

          l.   "Savings Plan Trustee" shall mean the person or entity acting 
as trustee from time to time of the Company's Savings and Profit Sharing Plan 
for Employees of First Interstate BancSystem, Inc., as Amended and Restated.

          m.   "Stock Sale" shall mean a sale of the Common Stock made by the 
Company or certain Affiliates as determined by the Board of Directors or the 
Committee from time to time and in accordance with the terms hereof.

          n.   "Subsidiary" shall mean a subsidiary corporation of the 
Company as defined in Section 424(f) of the Code.  

                           SECTION 3.   EFFECTIVE DATE

     The effective date of the Plan is May 1, 1998.

                          SECTION 4.   ADMINISTRATION

     4.1  ADMINISTRATION.  The Plan shall be administered by the Board of 
Directors or a committee appointed by and serving at the pleasure of the 
Board of Directors, consisting of not less than two Directors (the 
"Committee"). Subject to the foregoing, the number of Directors comprising 
the Committee shall be determined from time to time by the Board of Directors 
and may include the total number of Directors serving on the Board of 
Directors.  Unless otherwise adopted by resolution of the Board of Directors, 
the initial Committee shall consist of all members of the Board of Directors. 
The Board of Directors may from time to time remove members from or add 
members to the Committee, and vacancies on the Committee, howsoever caused, 
shall be filled by the Board of Directors.  If the Common Stock becomes 
registered under Section 12 of the Securities Exchange Act of 1934, as 
amended, the Committee shall be composed of Directors satisfying any 
applicable requirements of Rule 16b-3 so as to take advantage of the maximum 
exemption thereunder.

     4.2  COMMITTEE MEETINGS AND ACTIONS.  If appointed, the Committee shall 
hold meetings at such times and places as it may determine.  A majority of 
the members of the Committee shall constitute a quorum, and the acts of the 
majority of the members present at a meeting or a consent in writing signed 
by all members of the Committee shall be the acts of the Committee and shall 
be final, binding and conclusive upon all persons,

                                      -2-

<PAGE>

including the Company, its Subsidiaries, its shareholders, and all persons 
having any interest in Common Stock which may be or has been sold pursuant to 
the Plan.

     4.3  POWERS OF COMMITTEE.  The Committee shall have the full and 
exclusive right to administer Stock Sales and to determine the terms and 
conditions of all such Stock Sales under the Plan and to prescribe, amend and 
rescind rules and regulations for administration of the Plan.  The Committee 
shall also select those Directors, officers, employees or other persons who 
will be eligible to purchase Common Stock in any Stock Sale, and shall 
determine the amounts of Common Stock which each such Participant may 
purchase in any given Stock Sale, or in the aggregate.  In administering 
Stock Sales, the Committee shall take into consideration the contribution the 
Participant has made or may make to the success of the Company or its 
Subsidiaries and such other factors as the Committee shall determine.

     4.4  INTERPRETATION OF PLAN.  The determination of the Committee as to 
any disputed question arising under the Plan, including questions of 
construction and interpretation, shall be final, binding and conclusive upon 
all persons, including the Company, its Subsidiaries, its shareholders, and 
all Participants.

     4.5  INDEMNIFICATION.  Each person who is or shall have been a member of 
the Committee or of the Board of Directors shall be indemnified and held 
harmless by the Company against and from any loss, cost, liability or expense 
that may be imposed upon or reasonably incurred in connection with or 
resulting from any claim, action, suit or proceeding to which such person may 
be a party or in which such person may be involved by reason of any action 
taken or failure to act under the Plan and against and from any and all 
amounts paid in settlement thereof, with the Company's approval, or paid in 
satisfaction of a judgment in any such action, suit or proceeding against 
him, provided such person shall give the Company an opportunity, at its own 
expense, to handle and defend the same before undertaking to handle and 
defend it on such person's own behalf.  The foregoing right of 
indemnification shall not be exclusive of, and is in addition to, any other 
rights of indemnification to which any person may be entitled under the 
Company's Articles of Incorporation or Bylaws, as a matter of law, or 
otherwise, or any power that the Company may have to indemnify them or hold 
them harmless.

                    SECTION 5.   STOCK SUBJECT TO THE PLAN

     5.1  NUMBER.  The aggregate number of shares of Common Stock which may 
be sold pursuant to Stock Sales hereunder shall be as determined from time to 
time by the Board of Directors or the Committee.

     5.2  UNUSED STOCK.  If any shares of Common Stock made available for 
sale pursuant to a Stock Sale shall not be sold during an Offering Period, 
such unused shares of Common Stock shall not continue to be available under 
the Plan unless and until the Board of Directors or the Committee shall 
establish a new Offering Period with respect to a new Stock Sale.

                                      -3-

<PAGE>

     5.3  ADJUSTMENT FOR CHANGE IN OUTSTANDING SHARES.  If there is any 
change, increase or decrease, in the outstanding shares of Common Stock which 
is effected without receipt of additional consideration by the Company, by 
reason of a stock dividend, recapitalization, merger, consolidation, stock 
split, combination or exchange of stock, or other similar circumstances 
during an Offering Period, then in each such event, appropriate adjustments 
with respect to the aggregate number of shares of Common Stock available 
under the Plan for such Offering Period and the Purchase Price related 
thereto shall be deemed to be made in order to prevent the dilution or 
enlargement of any Participant's right to purchase a certain number of shares 
of Common Stock.  In connection with such adjustment or adjustments, 
fractional shares shall be rounded to the nearest whole share.  Any Committee 
determination confirming or approving any adjustments shall be final and 
conclusive.

                            SECTION 6.   ELIGIBILITY

     All full-time and part-time employees of the Company and its 
Subsidiaries, all Directors, the Savings Plan Trustee and other persons may 
be eligible, if, as and when determined by the Board of Directors or the 
Committee from time to time, in their sole discretion, to purchase shares of 
Common Stock pursuant to a Stock Sale.

                          SECTION 7.   STOCK SALES

     7.1 STOCK SALES.  The Board of Directors or Committee may from time to 
time, in their sole discretion, determine which of the eligible persons 
identified in Section 6 hereof shall be eligible to purchase shares of Common 
Stock in a Stock Sale and shall also determine the terms and conditions of 
such Stock Sale, including, without limitation, the Purchase Price, the 
Offering Period and the number of shares of Common Stock to be offered in 
connection therewith.

     7.2 OFFER LETTER.  Upon the Committee making a determination to sell 
Common Stock pursuant to a Stock Sale hereunder in accordance with the 
provisions of this Section 7, the Committee shall authorize and have sent to 
each Participant, an offer letter ("Offer Letter") setting forth the terms 
and conditions upon which Common Stock may be purchased by a Participant.  
Such Offer Letter will include, without limitation, the number of shares to 
be sold in the Stock Sale; the number of shares which may be purchased by a 
Participant, if a limit is established with respect to such Participant; the 
Purchase Price per share of the Common Stock sold; the Offering Period; 
instructions for acceptance and payment; the method for adjusting the number 
of shares which may be purchased by each Participant wishing to participate 
in such Stock Sale, in the event of an over-subscription of shares; and any 
other items determined by the Committee.

     7.3 SHAREHOLDER'S AGREEMENT.  Each Participant, other than the Savings 
Plan Trustee, who purchases Common Stock pursuant to a Stock Sale shall be 
required to execute a Shareholder's Agreement (the "Shareholder's Agreement") 
in substantially the same form as attached hereto as Exhibit "A" or in the 
form then in use by the Company if different therefrom; provided, however, 
that the Board of Directors or Committee may 

                                      -4-

<PAGE>

waive this requirement in their discretion. In the absence of such a waiver, 
execution of the Shareholder's Agreement shall be a condition precedent to 
the Company issuing certificates representing shares of Common Stock 
purchased hereunder.

     7.4 PURCHASE PRICE.  The Purchase Price per share of Common Stock sold 
under the Plan shall be equal to the Fair Market Value of the Common Stock at 
the beginning of an Offering Period as determined in accordance with Section 
7.5 hereof. 

     7.5 DETERMINATION OF FAIR MARKET VALUE.  The Fair Market Value shall be 
equal to the value of a minority interest in the Common Stock as determined 
(i) by the most recent quarterly appraisal performed by an independent 
appraiser engaged by the Board of Directors or the Committee, or (ii) in good 
faith by the Board of Directors or Committee, in their discretion.

     7.6 OFFERING PERIOD.  Offers to sell Common Stock pursuant to a Stock 
Sale shall be effective only during a period of time as established by the 
Board of Directors or the Committee in their discretion (the "Offering 
Period").  Upon termination of an Offering Period, Common Stock may not be 
sold pursuant hereto unless a new Offering Period is established hereunder 
with respect to a new Stock Sale.

     7.7 MANNER OF ACCEPTANCE.  Subject to the limitations and conditions of 
the Plan or the Offer Letter, a Participant may accept the Company's offer to 
sell Common Stock hereunder, in whole or in part, from time to time during 
the Offering Period, only by giving written notice of acceptance to the 
Secretary of the Company, which notice shall specify the number of shares of 
Common Stock to be purchased by the Participant and shall be accompanied by 
(1) payment in full to the Company of the Purchase Price of the shares to be 
purchased, plus (2) payment in full of such amount as the Company shall 
determine to be sufficient to satisfy any liability it may have for any 
withholding of federal, state or local income or other taxes incurred by 
reason of such purchase, and (3) a Shareholder Agreement meeting the 
requirements of this Section 7 if requested by the Company.  In the event the 
number of shares of Common Stock subscribed for in a Stock Sale exceeds the 
number of shares offered by the Company pursuant thereto, the number of 
shares which a Participant has indicated a desire to purchase will be 
adjusted on a pro rata basis by multiplying such number by a second number, 
the numerator of which is the number of shares subscribed for by such 
Participant, and the denominator of which is the aggregate total number of 
shares subscribed for by all Participants in such Stock Sale.

     7.8 PAYMENT OF PURCHASE PRICE.  Payment for shares and withholding taxes 
shall be made in the form of (1) cash, (2) a personal, certified or bank 
cashier's check to the order of the Company, or (3) in any combination of the 
foregoing or in any other form or method approved by the Committee, in its 
sole discretion, consistent with applicable laws and regulations.

     7.9 OTHER TERMS AND CONDITIONS.  The Shareholder's Agreement and the 
Offer Letter may contain such other provisions, which shall not be 
inconsistent with the Plan, as the Committee shall deem appropriate.

                                      -5-

<PAGE>

                SECTION 8.   NON-TRANSFERABILITY OF RIGHT TO PURCHASE

     Rights to purchase Common Stock granted pursuant to a Stock Sale and 
under the Plan are not transferable by the Participant except by will or by 
the laws of descent and distribution.  Any attempt to transfer, assign, 
pledge, hypothecate or otherwise dispose of any such right contrary to the 
provisions hereof, shall immediately become void.

                       SECTION 9.   ISSUANCE OF SHARES

     As soon as practicable after the Participant has given the Company 
written notice of his or her intent to purchase Common Stock pursuant to a 
Stock Sale, and after making payment and satisfying all other conditions of 
the Shareholder's Agreement and the Offer Letter, the Company shall issue or 
transfer to the Participant the number of shares of Common Stock as to which 
the Participant has purchased and shall deliver to the Participant a 
certificate or certificates therefor, registered in the Participant's name.  
In no event shall the Company be required to transfer fractional shares to 
the Participant.  If the issuance or transfer of shares by the Company would 
for any reason, in the opinion of counsel for the Company, violate any 
applicable federal or state laws or regulations, the Company may delay 
issuance or transfer of such shares to the Participant until compliance with 
such laws can reasonably be obtained.  In no event shall the Company be 
obligated to effect or obtain any listing, registration, qualification, 
consent or approval under any applicable federal or state laws or regulations 
or any contract or agreement to which the Company is a party with respect to 
the issuance of any such shares.

                       SECTION 10.   AMENDMENTS

     The Board of Directors may at any time and from time to time alter, 
amend, suspend or terminate the Plan or any part thereof as it may deem 
proper.

                      SECTION 11.   TERM OF PLAN

     This Plan shall terminate on May 1, 2003; provided, however, that the 
Board of Directors may at any time prior thereto suspend or terminate the 
Plan.

                   SECTION 12.   RIGHTS AS SHAREHOLDER

     A Participant shall have no rights as a shareholder of the Company with 
respect to any shares of Common Stock which are offered for sale under the 
Plan until the date of the issuance of the stock certificate for such shares.

                   SECTION 13.   NO EMPLOYMENT RIGHTS

     Nothing contained in this Plan, an Offer Letter or in any Shareholder's 
Agreement executed under the Plan shall confer upon any Participant any right 
with respect to the continuation of such Participant's employment by the 
Company or any Subsidiary or interfere in any way with the right of the 
Company or any Subsidiary, subject to the 

                                      -6-

<PAGE>

terms of any separate written employment agreement to the contrary, at any 
time, for any or no reason, to terminate such employment or to increase or 
decrease the compensation of the Participant from the rate in existence at 
the time of any Stock Sale.

                          SECTION 14.   GOVERNING LAW

     The Plan, and all purchases made under this Plan, shall be construed and 
shall take effect in accordance with the laws of the State of Montana, 
without regard to the conflicts of laws rules of such State.

     Adopted to be effective this 1st day of May, 1998.

                                        First Interstate BancSystem, Inc.

                                        By:  /s/ Terrill R. Moore
                                            -----------------------------
                                        Title: Senior Vice President and 
                                               --------------------------
                                               Chief Financial Officer
                                               --------------------------


                                      -7-

<PAGE>





                                    EXHIBIT "A"

                            SHAREHOLDER'S AGREEMENT FORM


     THIS AGREEMENT is made this _____ day of _________, 1998, by and between 
_____________, herein referred to as "Shareholder", and FIRST INTERSTATE 
BANCSYSTEM, INC., a Montana corporation, 401 North 31st Street, Billings, 
Montana 59101, herein referred to as the "Corporation".

                            W I T N E S S E T H :

     A. Shareholder owns shares of capital stock of the Corporation, which 
stock, together with any additional stock hereafter acquired by Shareholder, 
is herein referred to as the "Shares".

     B. The Corporation desires to restrict the issuance and holding of its 
corporate stock to officers, directors and employees of the Corporation or 
any of its subsidiaries, or to fiduciaries for the benefit of any such 
persons, or to charities. Such persons' status as director, officer or 
employee of the Corporation shall be herein referred to as the "Shareholders' 
Relationship with the Corporation".  This Shareholder's Agreement does not 
apply to the Corporation's stock held in the Savings Plan.

     C. The Corporation and Shareholder desire to obligate each other to 
sell and purchase shares under specified circumstances.

     NOW, THEREFORE, in consideration of the above facts and the 
Shareholder's and the Corporation's mutual promises herein, the Shareholder 
and the Corporation agree as follows:

     1. RESTRICTION ON TRANSFER OR PLEDGE OF SHARES.  Except as otherwise 
provided in this Agreement or as agreed upon in writing by the Shareholder 
and the Corporation, Shareholder shall not transfer or permit to be 
transferred, whether voluntarily, involuntarily or by operation of law, 
resulting from death or otherwise, any or all of the Shares now owned or 
hereafter acquired by Shareholder, and any attempted transfer in violation of 
this Agreement shall be void.  Shareholder shall not encumber or use any 
Shares as security for a loan, except upon the written consent of the 
Corporation.

     2. TRANSFER OF SHARES TO CHARITY.  A Shareholder may transfer Shares to 
any organization described in Section 170(b)(1)(A) of the Internal Revenue 
Code of 1986, as now or hereafter amended (the "Code"), a gift to which 
qualifies as a charitable deduction under Sections 170(c), 2055(a), or 
2522(a) of the Code (a "Charity").  Any transfer of Shares to a Charity shall 
be subject to the Corporation's option, exercisable by action of the Board of 
Directors of the Corporation, to purchase all or any portion of the Shares 
held by a Charity at the purchase price set forth in this Agreement, which 
may be exercised by written notice from the Corporation to the Charity at any 
time.

     3. PURCHASE OPTION UPON BONA FIDE SALE.  If a Shareholder intends to 
sell any Shares to any person other than the Corporation, Shareholder shall 
give ninety (90) days' written notice to the Corporation of the intention to 
sell Shares. The notice, in addition to stating the fact of the intention to 
sell Shares, shall state (i) the 

                                      1

<PAGE>

number of Shares to be sold, (ii) the name and address of the proposed 
purchaser, (iii) the amount of the consideration and the other terms of the 
sale.  At the request of the Corporation, Shareholder shall demonstrate to 
the reasonable satisfaction of the Corporation that the intended sale is bona 
fide.  Within ninety (90) days after the Corporation's receipt of the notice 
of intention to sell Shares, the Corporation may exercise an option to 
purchase all but not less than all of the Shares proposed to be sold.

     4. PURCHASE OPTION UPON DEATH.  Upon Shareholder's death, the 
Corporation, within ninety (90) days after the appointment of a personal 
representative for the deceased Shareholder's estate, for which written 
notice must be given by said personal representative within ten (10) days 
after appointment, may exercise an option to purchase all but not less than 
all of the deceased Shareholder's Shares from the personal representative of 
his or her estate. Shareholder, by signing this Agreement, directs his or her 
personal representatives to open Shareholder's estate promptly in the court 
of proper jurisdiction and execute, procure and deliver all documents, 
including, but not limited to appropriate order of such court and estate and 
inheritance tax waivers, as shall be required to effectuate the purposes of 
this Agreement.

     5. PURCHASE OPTION UPON INVOLUNTARY TRANSFER.  If other than by reason 
of Shareholder's death, Shares are transferred by operation of law to any 
person other than the Corporation (such as but not limited to a shareholder's 
trustee in bankruptcy, a purchaser at any creditor's or court sale or the 
guardian or conservator of an incompetent shareholder), Shareholder shall 
immediately give written notice to the Corporation of such transfer.  The 
Corporation, within ninety (90) days of the Corporation's receipt of actual 
notice of the transfer, may exercise an option to purchase all but not less 
than all of the Shares so transferred from the transferee of the Shares.  Any 
transfer of the Shares by operation of law shall be subject to this right and 
option of the Corporation to purchase the Shares.

     6. PURCHASE OPTION UPON TERMINATION OF RELATIONSHIP WITH THE 
CORPORATION. Upon the termination of Shareholder's Relationship with the 
Corporation, such termination being for any reason whatsoever, including but 
not limited to the voluntary resignation of Shareholder, the Corporation, 
within ninety (90) days after the date of such termination, may exercise an 
option to purchase all but not less than all of the Shares owned by the 
terminated Shareholder at the time of such termination.

     7. PURCHASE OPTION UPON DISABILITY.  If Shareholder shall become totally 
disabled, the Corporation, within ninety (90) days after the date of such 
total disability, may exercise an option to purchase all but not less than 
all of the Shares owned by the disabled Shareholder at the time of the 
commencement of his or her total disability.  A shareholder shall be deemed 
totally disabled within the meaning of this paragraph 7 if as a result of 
sickness, accident or injury, he or she becomes wholly and continuously 
unable to perform his or her duties for a period of six consecutive months, 
and his or her disability shall be deemed to have commenced at the end of 
said six-month period.

                                      2

<PAGE>

     8. GENERAL CORPORATE PURCHASE OPTION. Upon determination by the 
Corporation's Board of Directors that the number of Shares held by 
Shareholder is excessive in view of the Corporation's policy that the level 
of a shareholder's stock ownership should reflect certain factors, including 
but not limited to (a) the relative contribution of Shareholder to the 
economic performance of the Corporation, (b) the effort being put forth by 
Shareholder, and (c) the level of responsibility of Shareholder, the 
Corporation may exercise an option to purchase a portion of Shareholder's 
Shares sufficient to decrease the number of Shares owned by the Shareholder 
to an amount that the Board of Directors, in its sole discretion, believes is 
appropriate.  The Corporation shall not exercise said option in anticipation 
of a sale of the Corporation or a majority of the Corporation's stock and the 
Corporation agrees to exercise said option in a nondiscriminatory fashion.  
The number of Shares that the Corporation can purchase from Shareholder is 
limited to the stock obtained by the Shareholder after January 1, 1994.

     9. EXERCISE OF OPTION. The Corporation shall exercise any of the Options 
granted in paragraphs 3, 4, 5, 6, or 7 by delivering written notice of its 
exercise of the option, within the time provided in the applicable paragraph, 
to the Shareholder in the case of a paragraph 3 option, to the personal 
representative of Shareholder's estate in the case of a paragraph 4 option, 
to the transferee in the case of a paragraph 5 option, to the terminated 
Shareholder in the case of a paragraph 6 option, and to the disabled 
shareholder in the case of a paragraph 7 option.  The Corporation shall 
exercise the option granted in paragraph 8 by delivering written notice of 
its exercise of the option, specifying the number of Shares to be purchased, 
to the Shareholder.

     10. EFFECT OF NON-EXERCISE OF OPTIONS. If the purchase options are 
forfeited or not exercised in compliance with the terms of this Agreement, 
then the Shares to which the option applied shall be unrestricted and no 
longer subject to the terms of this Agreement.

      11. THE PURCHASE PRICE. The purchase price for each Share purchased 
pursuant to any of the options granted in this Agreement shall be the 
appraised value of a minority Share as stated in the most recent quarterly 
appraisal available to the Corporation. The Corporation's Shares shall be 
appraised as of the last day of each calendar quarter by an unaffiliated firm 
qualified to make such an appraisal, as determined by the Corporation's Board 
of Directors.  The expense of determining the appraised value shall be borne 
by the Corporation.  The appraisal of the Shares delivered to any department 
division or subsidiary of the Corporation may be utilized under this 
paragraph.

     The Corporation may, at its option, withhold any amount that the 
Shareholder owes the Corporation or its subsidiaries from the amount of the 
Purchase Price payable to Shareholder and apply said amount to such 
indebtedness.

                                      3

<PAGE>

     12. PAYMENT OF THE PURCHASE PRICE.

     12.1 PAYMENT TERMS.  The purchase price for Shares to be purchased by 
the Corporation pursuant to this Agreement shall be paid either in cash at 
closing or, at Shareholder's (including the personal representative of a 
deceased Shareholder) election, in installments as follows:

          (a)  25% of the purchase price at the closing.

          (b)  The balance of the purchase price in three (3) annual equal 
               payments of principal plus accrued interest thereon at a fixed 
               annual rate equal to the 5 year Treasury Note rate at the date 
               of closing plus one percent, the first installment to be paid one
               year after the closing, and the remaining installments each year 
               thereafter. 

The purchase price pursuant to exercise of the paragraph 5 option shall be 
paid in full in cash at the closing.

     12.2 PROMISSORY NOTE ON DEFERRED PORTION.  The deferred portion of the 
purchase price, if any, shall be evidenced by the promissory note of the 
Corporation made payable to the order of the Shareholder.  The Corporation 
note shall be  substantially in the form of that set forth in Exhibit A.

     13. THE CLOSING.

     13.1 TIME AND PLACE.  Unless otherwise agreed by the parties, the 
closing of the sale and purchase of Shares, as provided in this Agreement, 
shall take place at the general offices of the Corporation.  In the case of a 
purchase of Shares from a deceased Shareholder's estate under paragraph 4, 
the closing shall take place within one hundred twenty (120) days after the 
appointment of a personal representative for the deceased Shareholder's 
estate.  In the case of a purchase of Shares under paragraphs 3, 5, 6, 7, or 
8, the closing shall take place ten (10) days after the delivery to the 
Shareholder of written notice by the Corporation of its exercise of the 
option to purchase the Shareholder's Shares.

     13.2 DOCUMENTS.  At the closing of the sale and purchase, the 
Shareholder and the Corporation shall execute and immediately deliver to each 
other the various documents which shall be required to carry out their 
undertakings hereunder, including but not limited to the payment of cash, the 
execution and delivery of notes and the assignment and delivery of stock 
certificates free and clear of all taxes, debts, claims, judgments, liens or 
encumbrances whatsoever.

     14. LEGEND ON CERTIFICATES.  All Shares now or hereafter owned by 
Shareholder shall be subject to the provisions of this Agreement and 
Shareholder, and his or her transferee or successor agrees that the 
certificates representing same shall bear the following legend reciting the 
existence of the Agreement:

     The sale, transfer or encumbrance of this certificate is subject to an 
     agreement to restrict transfer or acquisition of the shares.  A copy of the

                                      4

<PAGE>

     agreement is on file in the office of the secretary of the 
     Corporation. Any transfer or acquisition in violation of the agreement 
     is null and void. 

Upon the execution of this Agreement, Shareholders shall immediately 
temporarily surrender his or her stock certificates to the Corporation and 
the Corporation shall cause the above legend to be placed thereupon before 
returning the certificates.

     15. REISSUED SHARES.  The Corporation shall have the right to substitute 
or reissue stock in exchange for the Shares in the event of a stock split, 
merger, consolidation, name change, sale, spin off, share exchange, or other 
corporate reorganization. Substituted or reissued stock shall be subject to 
the terms of this Agreement.

     16. TERMINATION.

     16.1 EVENTS CAUSING TERMINATION. This Agreement and all restrictions on 
stock transfer created hereby shall be effective as of the date hereof and 
shall terminate on the occurrence of the bankruptcy, receivership or 
dissolution of the Corporation, on the public trading of the Shares, or on 
the execution of a written instrument by the Corporation and the party or 
parties who then own Shares subject to this Agreement which terminates the 
same.

     16.2 SURVIVAL OF RIGHTS AND REMEDIES. The termination of this Agreement 
for any reason shall not affect any right or remedy existing hereunder prior 
to the effective date of termination hereof.

     17. GENERAL PROVISIONS.

     17.1 REMEDIES.  The parties agree that they will not have an adequate 
remedy at law for the breach of this Agreement because, among other reasons, 
the Shares cannot readily be purchased or sold on the open market.  The 
parties shall have available for any breach of this Agreement the remedies of 
specific performance and injunctive relief, together with all other remedies 
at law or in equity.  No waiver of or forbearance to enforce any right or 
provision hereof shall be binding unless in writing and signed by the party 
to be bound, and no such waiver or forbearance in any instance shall apply to 
any other instance or any other right or provision.

     17.2 MODIFICATION OR TERMINATION.  This Agreement may not be modified or 
terminated orally, and no modification, termination, or amendment shall be 
valid unless in writing signed by all parties hereto.

     17.3 GOVERNING LAW.  This Agreement shall be governed for all purposes 
by the laws of the State of Montana.

     17.4 SEVERABILITY.  Each term and provision of this Agreement is 
intended to be enforced to the maximum extent permitted by applicable law.  
If any term or provision of this Agreement or the applicability thereof to 
any person or circumstances shall to any extent be invalid or unenforceable, 
the remainder of this Agreement, or the application of such term or provision 
to persons or circumstances other than those as to which it is held invalid 
or unenforceable, shall not be affected thereby and shall continue in full 
force and effect.

                                      5

<PAGE>

     17.5 NOTICES.  All notices provided for by this Agreement shall be made 
in writing and shall be given either: (1) by actual delivery of the notice to 
the party entitled thereto; or (2) by mailing the notice in the U.S. mails, 
certified mail, return receipt requested to the last known address of the 
party entitled thereto. The notice shall be deemed to be received in case 
(1), on the date of its actual receipt by a party and in case (2), on the 
date of its mailing.  Any notice to be given by Shareholder shall be given on 
the form of notice attached hereto as Exhibit B.

     17.6 BINDING EFFECT.  This Agreement is binding upon and inures to the 
benefit of the Corporation and the Shareholder and their respective heirs, 
personal representatives, successors and assigns. 

     17.7 TIME.  Time shall be of the essence of this Agreement.

     17.8 HEADINGS.  The headings used herein are for convenience only, and 
shall not be construed as a part of this Agreement or as a limitation on the 
scope of the particular paragraphs to which they refer.

     17.9 ENTIRE AGREEMENT.  This Agreement contains the entire agreement and 
understanding of the parties, and supersedes any and all prior negotiations 
and understandings.  

     IN WITNESS WHEREOF, the parties have executed this Agreement on the date 
set forth on page 1.

                                     FIRST INTERSTATE BANCSYSTEM, INC.


                                     By ______________________________
                                        Terrill R. Moore, Secretary


                                            "Corporation"




____________________________
      "Shareholder"



                                      6

<PAGE>




                                   EXHIBIT A



$_____________                                            (Date)
                                                     -----------------
                                                     Billings, Montana


                                 PROMISSORY NOTE

     FOR VALUE RECEIVED, the undersigned promises to pay to the order of 
_____ ______, at _________________, or such other place as is designated from 
time to time by the holder of this note, in lawful money of the United 
States, the sum of ________________________________________________________ 
($_________) in the following manner:


     $_________ (including principal and interest) on ________, ____, and a 
     like sum on the same day of each succeeding year thereafter until the 
     full amount due hereunder has been paid.

     Each payment shall be applied first to accrued interest on the entire 
     outstanding principal balance from time to time at the rate of ____% per 
     annum from the date hereof and then to principal.  The undersigned may 
     not make advance payments on principal.

     Any installment of principal or interest payable hereunder, or any part 
thereof, which is not paid when due, shall thereafter bear interest at the 
rate equal to six percent (6%) over the interest rate stated above.

     If any payment due hereunder remains unpaid for more than thirty (30) 
days after it is due, the holder hereof may, at its option, declare the 
entire unpaid balance of principal and interest hereunder to be immediately 
due and payable.

     Waiver by the holder hereof of any default by the undersigned shall not 
constitute a waiver by the holder of a subsequent default.  Failure by the 
holder to exercise any right, power or privileges which it may have by reason 
of a default by the undersigned shall not preclude the exercise of such 
right, power or privilege so long as such default remains uncured or if a 
subsequent default occurs.

     The undersigned agrees to pay all costs of collection, including a 
reasonable attorney's fee, if this note is placed in the hands of an attorney 
for collection after default, and hereby waives demand, presentment for 
payment, protest, notice of protest, and notice of dishonor.

     Words used in the singular herein shall include the plural.

                                       FIRST INTERSTATE BANCSYSTEM, INC.

                                       By:
                                          --------------------------------

                                       Its:
                                          --------------------------------

<PAGE>

                                    EXHIBIT B


                                     NOTICE

To:   First Interstate BancSystem, Inc.
      401 North 31st Street
      Billings, MT  59101


      Pursuant to the Shareholder's Agreement between 
________________________ ("Shareholder") and First Interstate BancSystem, 
Inc. ("Corporation") dated ______________, the undersigned hereby gives 
notice of:

(Check One)


     _____  The undersigned shareholder's intention to sell Shares as follows:


            -  Number of Shares:     ____________
            -  Proposed Purchaser
               and Address:          __________________________
                                     __________________________
                                     __________________________
            -  Consideration:        __________________________
            -  Terms of Sale:        __________________________



     _____  The appointment of the undersigned as personal representative of 
Shareholder's Estate on __________________________.  A true and correct copy 
of the personal representative letters issued to the undersigned is attached 
hereto.

     _____  The involuntary transfer of Shareholder's Shares


Dated: ______________________________________

                                    __________________________________



<PAGE>


              ADDENDUM TO SHAREHOLDER'S AGREEMENT DATED           , BETWEEN
                                    , SHAREHOLDER, AND FIRST INTERSTATE
                           BANCSYSTEM, INC., CORPORATION


THIS AGREEMENT is made this ____ day of _________________, 19__, by and 
between _______________________________, herein referred to as "Shareholder", 
___________________________, herein referred to as "Fiduciary", and FIRST 
INTERSTATE BANCSYSTEM, INC., a Montana corporation, herein referred to as the 
"Corporation", as an addendum to the Shareholder's Agreement dated 
_______________, by and between Shareholder and the Corporation, herein 
referred to as the "Shareholder's Agreement."

                              W I T N E S S E T H:

     A.  Shareholder's Shares are held by Fiduciary for the benefit of 
Shareholder.

     B.  Shareholder and the Corporation desire to bind Fiduciary to the 
terms and conditions of the Shareholder's Agreement.

     NOW, THEREFORE, the parties agree as follows:

     1.   FIDUCIARY TO BE BOUND BY SHAREHOLDER'S AGREEMENT.  The parties 
agree that Fiduciary, as custodian of or trustee over Shareholder's Shares, 
is bound by the terms and conditions of the Shareholder's Agreement and is 
obligated to manage and control said Shares in accordance with the 
restrictions and obligations of the Shareholder's Agreement.

     2.   RATIFICATION OF SHAREHOLDER'S AGREEMENT.  The parties agree that 
except as modified herein, the terms and conditions of the Shareholder's 
Agreement are hereby confirmed and ratified.

     IN WITNESS WHEREOF, the parties have executed this agreement on the date 
set forth above.

                                       FIRST INTERSTATE BANCSYSTEM, INC.


                                       By: _________________________________
                                           Terrill R. Moore, Secretary



                                                 "CORPORATION"

________________________________
       "SHAREHOLDER"


By: ____________________________

Its: ___________________________

           "FIDUCIARY"



<PAGE>

                             HOLLAND & HART LLP
                              ATTORNEYS AT LAW

                                  SUITE 500
                            215 SOUTH STATE STREET
                       SALT LAKE CITY, UTAH  84111-2346
DENVER - ASPEN                                         TELEPHONE (801) 595-7800
BOULDER - COLORADO SPRINGS                             FACSIMILE (801) 364-9124
DENVER TECH CENTER
BILLINGS - BOISE
CHEYENNE - JACKSON HOLE
SALT LAKE CITY


                                May 15, 1998

First Interstate BancSystem, Inc.
401 North 31st Street
Billings, MT  59101

Ladies and Gentlemen:

     We have acted as counsel to First Interstate BancSystem, Inc., a Montana 
corporation (the "Company"), in connection with the registration under the 
Securities Act of 1933 (the "Act") of 500,000 shares of the Company's common 
stock, no par value (the "Shares"), to be offered upon the terms and subject 
to the conditions set forth in the Savings and Profit Sharing Plan for 
Employees of First Interstate BancSystem, Inc., as Amended and Restated, the 
First Interstate BancSystem, Inc. Stock Option and Stock Appreciation Rights 
Plan, as Amended, and the First Interstate BancSystem, Inc. Employee Stock 
Purchase Plan (collectively, the "Stock Plans").

     In connection therewith, we have examined originals or copies, certified 
or otherwise identified to our satisfaction, of the Articles of Incorporation 
of the Company, the Bylaws of the Company, the Stock Plans, records of 
relevant corporate proceedings with respect to the offering of the Shares and 
such other documents, instruments and corporate proceedings with respect to 
the offering of the Shares and such other documents, instruments and 
corporate records as we have deemed necessary or appropriate for the 
expression of the opinion contained herein.  We have also reviewed the 
Company's Registration Statement on Form S-8 (the "Registration Statement") 
to be filed under the Act with the Securities and Exchange Commission on May 
19, 1998 with respect to the Shares.

     We have assumed the authenticity and completeness of all records, 
certificates and other instruments submitted to us as originals, the 
conformity to original documents of all records, certificates and other 
instruments submitted to us as copies, the authenticity and completeness of 
the originals of those records, certificates and other instruments submitted 
to us as copies and the correctness of all statements of fact contained in 
all records, certificates and other instruments that we have examined.

     Based on the foregoing, we are of the opinion that the Shares have been 
duly authorized and, when issued in accordance with the terms of the Stock 
Plans, will be validly issued, fully paid and non-assessable.

<PAGE>

     The opinion expressed herein is based solely upon and is limited to the 
general corporation laws of the State of Montana and the federal laws of the 
United States of America, to the extent applicable.

     We hereby consent to the filing of this opinion as an exhibit to the 
Registration Statement. 

                              Very truly yours,

                              Holland & Hart LLP




<PAGE>


                                                               EXHIBIT 23.1





The Board of Directors
First Interstate BancSystem, Inc.:

We consent to incorporation by reference in the registration statement to be 
filed on Form S-8 of First Interstate BancSystem, Inc. of our report dated 
February 6, 1998, relating to the consolidated balance sheets of First 
Interstate BancSystem, Inc. and subsidiaries as of December 31, 1997 and 
1996, and the related consolidated statements of income, stockholders' 
equity, and cash flows for each of the years in the three-year period ended 
December 31, 1997, which report appears in the December 31, 1997, annual 
report on Form 10-K of First Interstate BancSystem, Inc. 

We consent to incorporation by reference in the registration statement to be 
filed on Form S-8 of First Interstate BancSystem, Inc. of our report dated 
May 30, 1997, relating to the statements of net assets available for benefits 
of the Savings and Profit Sharing Plan for Employees of First Interstate 
BancSystem of Montana, Inc. as of December 31, 1996 and 1995 and the related 
statements of changes in net assets available for employee benefits for the 
years then ended, which report appears in the December 31, 1996 Form 11-K of 
the Savings and Profit Sharing Plan for Employees of First Interstate 
BancSystem of Montana, Inc.

We consent to the reference to our firm under the heading "Item 3. 
Incorporation of Certain Documents by Reference" in the registration 
statement.

                                   /s/ KPMG Peat Marwick LLP

Billings, Montana
May 18, 1998



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