ONEOK INC /NEW/
PRE 14A, 1998-11-04
NATURAL GAS TRANSMISISON & DISTRIBUTION
Previous: CONCENTRA MANAGED CARE INC, 424B3, 1998-11-04
Next: GROUP MAINTENANCE AMERICA CORP, 8-K, 1998-11-04



<PAGE>
 
================================================================================
 
                           SCHEDULE 14A INFORMATION

          Proxy Statement Pursuant to Section 14(a) of the Securities
                    Exchange Act of 1934 (Amendment No.  )
        
Filed by the Registrant [X]

Filed by a Party other than the Registrant [_] 

Check the appropriate box:

[X]  Preliminary Proxy Statement        [_]  Confidential, for Use of the 
                                             Commission Only (as permitted by
                                             Rule 14a-6(e)(2))
[_]  Definitive Proxy Statement 

[_]  Definitive Additional Materials 

[_]  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 240.14a-12

                                  ONEOK, INC.
- --------------------------------------------------------------------------------
               (Name of Registrant as Specified In Its Charter)

                          
- --------------------------------------------------------------------------------
   (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

   
Payment of Filing Fee (Check the appropriate box):

[X]  No fee required.

[_]  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

   
     (1) Title of each class of securities to which transaction applies:

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


     (2) Aggregate number of securities to which transaction applies:

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


     (3) Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (Set forth the amount on which
         the filing fee is calculated and state how it was determined):

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

     (4) Proposed maximum aggregate value of transaction:

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


     (5) Total fee paid:

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

[_]  Fee paid previously with preliminary materials.
     
[_]  Check box if any part of the fee is offset as provided by Exchange
     Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee
     was paid previously. Identify the previous filing by registration statement
     number, or the Form or Schedule and the date of its filing.
     
     (1) Amount Previously Paid:
 
     -------------------------------------------------------------------------


     (2) Form, Schedule or Registration Statement No.:

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


     (3) Filing Party:
      
     -------------------------------------------------------------------------


     (4) Date Filed:

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

Notes:
<PAGE>
 
                          [LOGO OF ONEOK APPEARS HERE]
 
                                 NOTICE OF 1999
 
                                 ANNUAL MEETING
                                of SHAREHOLDERS
                               PROXY STATEMENT &
                                   FORM 10-K
                         for Year Ended August 31, 1998
 
 
               100 West Fifth Street       Tulsa, Oklahoma 74103
<PAGE>
 
 
                                  ONEOK, INC.
                             100 WEST FIFTH STREET
                             TULSA, OKLAHOMA 74103
 
                   NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
                               JANUARY 21, 1999
 
                                                              November 30, 1998
 
To the Shareholders of ONEOK, Inc.:
 
  Notice is hereby given that the Annual Meeting of the Shareholders of ONEOK,
Inc. will be held at ONEOK Plaza, 100 West Fifth Street, Tulsa, Oklahoma,
Thursday, January 21, 1999, at 10 a.m. for the following purposes:
 
  1. To elect four directors (Class B) to serve until the Annual Meeting of
     Shareholders to be held January 17, 2002, or until their successors are
     duly elected and qualified, and one director (Class A) to serve until
     the Annual Meeting of Shareholders to be held January 18, 2001, or until
     his successor is duly elected and qualified.
 
  2. To amend and restate the Key Employee Stock Plan of the Corporation.
 
  3. To ratify and approve the appointment of KPMG Peat Marwick LLP as
     independent auditor of the Corporation for the 1999 Fiscal Year.
 
  4. To transact such other business as may properly come before the meeting
     and at any and all adjournments thereof.
 
  Only shareholders of record on the stock transfer books of the Corporation
at the close of business November 24, 1998, the record date fixed by the Board
of Directors, are entitled to notice of and to vote at the meeting and at any
and all adjournments thereof.
 
                                          By Order of the Board of Directors,
 
                                          Deborah B. Barnes, Secretary
 
  TO ASSURE YOUR REPRESENTATION AT THE MEETING, PLEASE SIGN AND MAIL THE
ENCLOSED PROXY, WHICH IS BEING SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
OF ONEOK, INC. A return envelope that requires no postage, if mailed in the
United States, is enclosed for your convenience in returning your proxy. If
you receive more than one form of proxy, it is an indication that your shares
are registered in more than one account. All proxy forms received by you
should be signed and returned promptly to be sure that all your shares are
voted.
 
  If your shares are held in the name of a broker, trust, bank, or other
nominee and you plan to attend the meeting and vote your shares in person, you
should bring with you a proxy or letter from the broker, trustee, bank, or
nominee confirming your beneficial ownership of the shares.
<PAGE>
 
                                PROXY STATEMENT
 
                                  ONEOK, INC.
                             100 WEST FIFTH STREET
                             TULSA, OKLAHOMA 74103
 
                                                              November 30, 1998
 
                        ANNUAL MEETING OF SHAREHOLDERS
                               JANUARY 21, 1999
 
                            PROXY AND SOLICITATION
 
  The accompanying proxy is solicited by the Board of Directors of ONEOK, Inc.
(the Corporation) for use at the Annual Meeting of Shareholders (Annual
Meeting) to be held at ONEOK Plaza, 100 West Fifth Street, Tulsa, Oklahoma, on
Thursday, January 21, 1999, at 10 a.m. and at any and all adjournments
thereof. All references in this Proxy Statement to the "Corporation" or the
Board of Directors, officers or directors of the Corporation prior to the
merger on November 26, 1997, of the Corporation with ONEOK Inc. shall mean
ONEOK Inc., its Board of Directors, officers and directors.
 
  Properly executed proxies received in time for the Annual Meeting will be
voted. If the enclosed proxy is executed and returned, it may be revoked by a
later-dated proxy or by written notice to the Secretary of the Corporation.
Shareholders attending the meeting may revoke their previously executed
proxies and vote in person.
 
  The cost of soliciting proxies will be borne by the Corporation. In addition
to the use of the mails, proxies may be solicited personally or by telephone
by officers and regular employees of the Corporation. Morrow & Co., Inc., New
York, New York, will assist in solicitation of proxies. The Corporation will
pay $8,500.00 to Morrow & Co., Inc., for proxy solicitation services. The
Corporation does not expect to pay any additional compensation for the
solicitation of proxies; however, the proxy solicitor, brokers, and other
custodians, nominees, and fiduciaries will be reimbursed for expenses incurred
in forwarding proxy material to principals and obtaining their proxies.
 
                      STOCK OUTSTANDING AND VOTING RIGHTS
 
  At Record Date the Corporation had issued and outstanding      shares of
Common Stock, entitled to vote at this meeting.
 
  Under Oklahoma Law and the Corporation's By-laws, the holders of record of a
majority in voting interest of the shares of the stock of the Corporation
entitled to be voted at the Annual Meeting and present in person or by proxy
shall constitute a quorum for the Annual Meeting. In all matters other than
the election of directors, the affirmative vote of a majority in voting
interest of the shares and present in person or by proxy at the Annual Meeting
and entitled to vote on the subject matter shall be the act of the
shareholders. Abstentions are treated as votes against a proposal, and broker
non-votes have no effect on the vote. Directors shall be elected by a
plurality of the votes present in person or represented by proxy at the Annual
Meeting and entitled to vote on the election of directors.
 
 
                                       1
<PAGE>
 
                SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS
 
  The following are known to the Corporation to be the beneficial owners of
more than five percent (5%) of any class of the Corporation's voting
securities at the Record Date.
 
<TABLE>
<CAPTION>
                                NAME AND ADDRESS           AMOUNT AND NATURE    PERCENT
TITLE OF CLASS                OF BENEFICIAL OWNER       OF BENEFICIAL OWNERSHIP OF CLASS
- --------------           ------------------------------ ----------------------- --------
<S>                      <C>                            <C>                     <C>
Common Stock............ Bank of Oklahoma                       Shares               %
                         Trustee for Thrift Plan           Direct
                         for Employees of ONEOK, Inc.
                         and Subsidiaries P.O. Box 2300
                         Tulsa, OK 74192
Common Stock............ Western Resources, Inc. (1)            Shares               %
                         818 Kansas Avenue                 Direct
                         Topeka, KS 66612-1217
- ----------------------------------------------------------------------------------------
Preferred Stock......... Western Resources, Inc. (1)       19,946,448 Shares      100%
(Series A)               818 Kansas Avenue                 Direct
                         Topeka, KS 66612-1217
Preferred Stock......... Western Resources, Inc. (1)       60,526 Shares           48%
(Series B)               818 Kansas Avenue                 Direct
                         Topeka, KS 66612-1217
Preferred Stock......... Westar Capital, Inc. (1)(2)       65,300 Shares           52%
(Series B)               818 Kansas Avenue                 Direct
                         Topeka, KS 66612-1217
</TABLE>
- --------
(1) As of the Record Date, Western Resources, Inc. and its affiliates owned
    approximately  % of the outstanding shares of the capital stock of the
    Corporation. Holders of the outstanding convertible preferred stock are
    not entitled to vote on any matters being considered at this Annual
    Meeting.
 
(2) Westar Capital, Inc. is an affiliate of Western Resources, Inc.
 
 
                                       2
<PAGE>
 
            SECURITY OWNERSHIP OF DIRECTORS AND EXECUTIVE OFFICERS
 
  The following table sets forth the shares of Common Stock beneficially owned
by directors and nominees for directors, the chief executive officer, the four
additional most highly compensated executive officers serving at the end of
the fiscal year and by all executive officers and directors as a group as of
August 31, 1998 of the Corporation. Beneficial ownership of the stock is as
shown unless otherwise footnoted.
 
                    DIRECTORS' & OFFICERS' STOCK OWNERSHIP
 
<TABLE>
<CAPTION>
                          SHARES OF    DIRECTORS'  TOTAL OF SHARES OF COMMON
                            COMMON      DEFERRED   STOCK BENEFICIALLY OWNED
                            STOCK     COMPENSATION PLUS DIRECTORS' DEFERRED  PERCENT
                         BENEFICIALLY PLAN PHANTOM     COMPENSATION PLAN       OF
NAME                      OWNED (1)    STOCK (2)         PHANTOM STOCK       CLASS*
- ----                     ------------ ------------ ------------------------- -------
<S>                      <C>          <C>          <C>                       <C>
Edwyna G. Anderson......       371                             371
 Director
William M. Bell.........     2,710        631                3,341
 Director
Larry W. Brummett.......    67,454(3)                       67,454
 Chairman of the Board,
  and Chief Executive
 Officer--ONEOK, Inc.
Douglas R. Cummings.....     2,200                           2,200
 Director
Eugene N. Dubay.........    18,806(4)                       18,806
 President and Chief
  Operating Officer--
 Kansas Gas Service
  Company
William L. Ford.........     3,941(5)     633                4,574
 Director
Howard R. Fricke........                  796                  796
 Director
J. M. Graves............     2,561        631                3,192
 Director
Stephen J. Jatras.......     3,300                           3,300
 Director
James C. Kneale.........    26,187(6)                       26,187
 President and Chief
  Operating Officer--
 Oklahoma Natural Gas
  Company
David L. Kyle...........    53,812(7)                       53,812
 Director and
  President--ONEOK, Inc.
Douglas T. Lake (8).....     3,000                           3,000
 Director
Bert H. Mackie..........     2,087                           2,087
 Director
Jerry D. Neal...........    34,182(9)                       34,182
 Vice President,
  Treasurer, and Chief
  Financial
 Officer--ONEOK, Inc.
</TABLE>
 
                                       3
<PAGE>
 
      SECURITY OWNERSHIP OF DIRECTORS AND EXECUTIVE OFFICERS (CONTINUED)
 
<TABLE>
<CAPTION>
                           SHARES OF      DIRECTORS'  TOTAL OF SHARES OF COMMON
                             COMMON        DEFERRED   STOCK BENEFICIALLY OWNED
                             STOCK       COMPENSATION PLUS DIRECTORS' DEFERRED  PERCENT
                          BENEFICIALLY   PLAN PHANTOM     COMPENSATION PLAN       OF
NAME                       OWNED (1)      STOCK (2)         PHANTOM STOCK       CLASS*
- ----                      ------------   ------------ ------------------------- -------
<S>                       <C>            <C>          <C>                       <C>
Douglas Ann Newsom,
 Ph.D...................        755                                755
 Director
Gary D. Parker..........      4,589(10)        94                4,683
 Director
J. D. Scott.............    133,282(11)                        133,282
 Director and Retired
  Chairman of the
 Board--ONEOK, Inc.
Stanton L. Young........     62,300                             62,300
 Director
All directors and
 executive officers as a
 group
 including those named
  above.................    421,537(12)     2,785              424,322           1.34%
</TABLE>
- --------
* Less than one percent of class unless otherwise noted.
 
NOTES TO STOCK OWNERSHIP TABLE:
 
(1) This column includes ONEOK, Inc. stock held by directors and officers or
    by certain members of their families (for which the directors and officers
    have sole or shared voting or investment power), shares of common stock
    they hold in the ONEOK, Inc. Common Stock Direct Stock Purchase and
    Dividend Reinvestment Plan, and ONEOK, Inc. securities directors and
    officers have the right to acquire within 60 days of August 31, 1998. The
    following number of shares, representing such unexercised options, were
    added to the holdings of each of the following directors and officers: Mr.
    Brummett, 25,000 shares; Mr. Kyle, 17,500 shares; Mr. Dubay, 10,000
    shares; Mr. Kneale, 8,574 shares; and Mr. Neal, 10,900 shares.
 
(2) Phantom Stock has a value equal to Common Shares, but Phantom Stock has no
    voting rights or other shareholder rights (see "Directors' Compensation"
    below for further information concerning Deferred Compensation Plan for
    Non-Employee Directors). Therefore, Phantom Stock suffers all the risks,
    and enjoys all the rewards, of changes in the price of Common Shares.
 
(3) Mr. Brummett's daughter, Kari R. Brummett, not a minor, owns 9 shares not
    included in this number. In addition, Mr. Brummett is holding as custodian
    9 shares for his son, Christopher A. Brummett, a minor. Shares of Common
    Stock of the Corporation in the custody of the Trustee under the Thrift
    Plan include 17,306 shares for the account of Mr. Brummett.
 
(4) Shares of Common Stock of the Corporation in the custody of the Trustee
    under the Thrift Plan include 4,729 shares for the account of Mr. Dubay.
 
(5) Includes 1,092 shares owned by the 1979 Leslie A. Ford Trust, of which
    William L. Ford is a trustee. Mr. Ford is not a beneficial owner of these
    shares and disclaims ownership thereof.
 
(6) Includes 3,675 shares owned by Mrs. James C. Kneale. Mr. Kneale disclaims
    ownership of these shares. Mr. Kneale's son, James Curtis Kneale, II, not
    a minor, owns 20 shares not included in this number. In addition, Mr.
    Kneale is holding in trust 640 shares for his daughter. Shares of Common
    Stock of the Corporation in the custody of the Trustee under the Thrift
    Plan include 11,722 shares for the account of Mr. Kneale.
 
(7) Shares of Common Stock of the Corporation in the custody of the Trustee
    under the Thrift Plan include 25,895 shares for the account of Mr. Kyle.
 
                                       4
<PAGE>
 
 (8) Mr. Lake was elected by the Board of Directors effective October 15,
     1998.
 
 (9) Shares of Common Stock of the Corporation in the custody of the Trustee
     under the Thrift Plan include 14,814 shares for the account of Mr. Neal.
 
(10) Includes 470 shares owned by Mrs. Gary D. Parker. In addition, Mr. Parker
     is holding 1,400 shares in trust as the Trustee of the Phillip Wilkinson
     Irrevocable Trust under agreement dated 7/13/95.
 
(11) Shares of Common Stock of the Corporation in the custody of the Trustee
     under the Thrift Plan include 73,937 for Mr. Scott, who retired from the
     Corporation in 1994.
 
(12) Shares of Common Stock of the Corporation in the custody of the Trustee
     under the Thrift Plan include 187,757 shares for directors and executive
     officers as a group and are reported in the preceding tabulation. Non-
     employee directors do not participate in the Thrift Plan, except Mr.
     Scott who, as a former employee, has elected to leave his Thrift Plan
     holdings intact.
 
                           INFORMATION ON DIRECTORS
 
                            NOMINEES FOR DIRECTORS
 
                           CLASS B--TERM ENDING 2002
 
<TABLE>
 <C>                 <S>
 WILLIAM M. BELL     President
 (age 63)            Bank One, Oklahoma, N.A.
 Director since 1981 Oklahoma City, Oklahoma
                     Mr. Bell is also a director of Bank One, Oklahoma, N.A. He
                     serves on the boards of numerous civic and business
                     organizations and not-for-profit associations.
 DOUGLAS R. CUMMINGS President and Owner--Cummings Oil Company
 (age 68)            Oklahoma City, Oklahoma
 Director since 1989
                     Mr. Cummings has been President of Cummings Oil Company
                     since 1972. He is an officer or director of numerous civic
                     and business organizations and not-for-profit
                     associations.
 HOWARD R. FRICKE    Chairman of the Board and Chief Executive Officer--
 (age 62)            Security Benefit Group of Companies
 Director since 1997 Topeka, Kansas
                     Mr. Fricke joined the Security Benefit Group of Companies
                     in 1988, having previously served as chairman and chief
                     executive officer of the Anchor National Companies in
                     Phoenix, Arizona. He is currently a director of Payless
                     ShoeSource, Inc., and UMB Financial Corp. He also serves
                     on the boards of directors of the American Council of Life
                     Insurance and Life Office Management Association.
 DAVID L. KYLE       President and Chief Operating Officer--ONEOK, Inc.
 (age 46)            Tulsa, Oklahoma
 Director since 1995
                     Mr. Kyle was employed by Oklahoma Natural Gas Company, a
                     division of ONEOK Inc., in 1974 as an engineer trainee. He
                     served in a number of positions prior to being elected
                     Vice President of Gas Supply September 1, 1986, and
                     Executive Vice President May 17, 1990. He was elected
                     President September 1, 1994. He was elected President of
                     ONEOK Inc. effective September 1, 1997.
</TABLE>
 
                                       5
<PAGE>
 
                              CONTINUING DIRECTORS
 
                           CLASS C--TERM ENDING 2000
 
<TABLE>
 <C>                 <S>
 EDWYNA G. ANDERSON  Retired General Counsel--Duquense Light Company
 (age 68)            Pittsburgh, Pennsylvania
 Director since 1995
                     Mrs. Anderson served as General Counsel of Duquense Light
                     Company from September 1988 until retirement in October
                     1994. She also served as Special Counsel to the President
                     of Duquense Light Company until March 1995, when she
                     retired from that position.
 WILLIAM L. FORD     President--Shawnee Milling Company
 (age 55)            Shawnee, Oklahoma
 Director since 1981
                     Mr. Ford has served as President of Shawnee Milling
                     Company since 1979. He serves on the boards of numerous
                     civic and business organizations and not-for-profit
                     associations.
 BERT H. MACKIE      President--Security National Bank
 (age 56)            Enid, Oklahoma
 Director since 1989
                     Mr. Mackie, has been with Security National Bank since
                     1962, is currently President and a director. Mr. Mackie
                     serves on the Board of Governors of the United States
                     Postal Service.
 GARY D. PARKER      President--Moffitt, Parker & Company, Inc.
 (age 53)            Muskogee, Oklahoma
 Director since 1991
                     Mr. Parker, a certified public accountant, is also the
                     majority shareholder of Moffitt, Parker & Company, Inc.,
                     and has been President of the firm since 1982. He is a
                     director of First National Bank and Trust Company of
                     Muskogee, Oklahoma.
 STANTON L. YOUNG    President--The Young Companies
 (age 71)            Oklahoma City, Oklahoma
 Director since 1972
                     Mr. Young is an individual investor with ownership of oil
                     and gas mineral and working interests, a shopping center,
                     and warehouses. He is also Owner and President of Journey
                     House Travel Service, Inc., in Oklahoma City.
 
                           CLASS A--TERM ENDING 2001
 
                     Chairman of the Board and Chief Executive Officer--ONEOK,
 LARRY W. BRUMMETT   Inc.
 (age 48)            Tulsa, Oklahoma
 Director since 1994
                     Mr. Brummett has been employed by the Corporation for more
                     than 23 years. He was employed by ONEOK's Oklahoma Natural
                     Gas Company division as an engineer trainee in June 1974
                     and, after receiving a number of promotions within the
                     division, was elected Vice President of Tulsa District
                     September 1, 1986, and Executive Vice President in May
                     1990. He was elected Executive Vice President of ONEOK
                     Inc. January 21, 1993. He was elected President and Chief
                     Executive Officer February 17, 1994, and was elected to
                     the additional position of Chairman of the Board effective
                     June 1, 1994. Mr. Brummett is a director of American Gas
                     Association; Southern Gas Association; Oklahoma State
                     Chamber of Commerce; Metropolitan Chamber of Commerce,
                     Tulsa; and the Oklahoma City Branch of the Federal Reserve
                     Bank. He is also an officer or director of numerous civic
                     and business organizations and not-for-profit
                     associations.
</TABLE>
 
                                       6
<PAGE>
 
<TABLE>
 <C>                      <S>
 DOUGLAS T. LAKE          Executive Vice President and Chief Strategic Officer
 (age 48)                 Western Resources, Inc.
 Elected Director in      Topeka, Kansas
  October, 1998
                          Mr. Lake joined Western Resources, Inc. in September,
                          1998, having previously served as Senior Managing
                          Director of the Investment Banking Department of Bear
                          Stearns & Co. Inc. He is currently a director of
                          Guardian International Inc.
 DOUGLAS ANN NEWSOM Ph.D. Professor--Department of Journalism
 (age 64)                 Texas Christian University
 Director since 1982      Fort Worth, Texas
                          In addition to her teaching position, Dr. Newsom is a
                          textbook author and public relations counselor.
 J. D. SCOTT              Retired Chairman of the Board--ONEOK Inc.
 (age 66)                 Tulsa, Oklahoma
 Director since 1979
                          Mr. Scott served as President, Chief Executive
                          Officer, and Chairman of the Board of ONEOK Inc. from
                          January 1987 until he retired in 1994.
</TABLE>
 
           ADDITIONAL INFORMATION CONCERNING THE BOARD OF DIRECTORS
 
  Nine meetings were held by the Board of Directors during the fiscal year
ended August 31, 1998 (the "1998 Fiscal year"). No Director attended fewer
than seventy-five percent (75%) of the meetings of the Board of Directors and
committees on which such director served.
 
  The Board of Directors designated Charles C. Ingram as Chairman of the Board
Emeritus to be an honorary officer of the Board and to serve at its pleasure
in recognition of his long and faithful service to the Corporation and the
Board. Mr. Ingram retired as a full-time employee of the Corporation effective
January 1, 1982, and as a director January 20, 1988.
 
                            DIRECTORS' COMPENSATION
 
  The aggregate amount of directors' fees paid during the 1998 Fiscal Year was
$397,250, of which $98,625 was deferred under the Deferred Compensation Plan
for Non-Employee Directors. Officer-directors receive no additional
compensation for service on the Board of Directors or its committees. All
other directors received an annual retainer of $22,500; a fee of $1,000 for
attending each board meeting and each committee meeting; and reimbursement for
expenses incurred in attending board and/or committee meetings. Nonofficer
directors who chair a committee received an additional annual retainer of
$3,500.
 
DEFERRED COMPENSATION PLAN FOR NON-EMPLOYEE DIRECTORS
 
  Effective January 15, 1998, the Corporation adopted the Deferred
Compensation Plan for Non-Employee Directors (the "Plan"). All outside
directors are eligible to participate in the Plan. Under the Plan, in January
of each year, each outside director of the Corporation may elect to have all
or a part of the annual retainer fee and meeting fees payable by the
Corporation deferred and treated as phantom stock or as a cash deferral.
Phantom stock deferrals will be treated as though the deferred retainer and/or
fees are invested in Common Stock of the Corporation at the Fair Market Value
on the date the retainer/fees are earned, and will be credited with the
equivalent of dividends reinvested at the Fair Market Value on the payment
date of each Common Stock dividend
 
                                       7
<PAGE>
 
until paid out. Phantom stock accounts will be valued for payment according to
the formula established in the Plan. Phantom Stock accounts are representative
of shares of Common Stock receivable by a Non-Employee Director under the
Long-Term Incentive Plan (formerly Key Employee Stock Plan) but deferred until
settlement in shares of Common Stock at an elected deferral date. Cash
deferrals will be credited with interest at the Investment Return Rate
determined by the Executive Compensation Committee annually, from the date on
which the deferred retainer/fees are earned until they are paid out.
 
            SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
  Based solely on information submitted by the directors and officers, it has
been determined that all directors and all officers of the Corporation who are
required to so file have timely filed all forms required to be filed under
Section 16(a) of the Securities Exchange Act of 1934, as amended.
 
                     COMMITTEES OF THE BOARD OF DIRECTORS
 
  The Board of Directors has standing Executive, Audit, Nominating and
Corporate Governance, and Executive Compensation Committees.
 
EXECUTIVE COMMITTEE
 
  During the 1998 Fiscal Year, members of the Executive Committee were:
Chairman Larry W. Brummett, Vice Chairman David L. Kyle, William M. Bell,
Douglas R. Cummings, Howard R. Fricke, J. M. Graves, Stephen J. Jatras, and J.
D. Scott.
 
  The Committee met two times during the 1998 Fiscal Year. The Executive
Committee may exercise all of the powers and authority of the Board of
Directors in the management of the business and affairs of the Corporation
subject to certain statutory limitations.
 
AUDIT COMMITTEE
 
  During the 1998 Fiscal Year, members of the Audit Committee were: Chairman
Stephen J. Jatras, Vice Chairman Gary D. Parker, Edwyna G. Anderson, William
M. Bell, William L. Ford, Steven L. Kitchen, Bert H. Mackie, Douglas Ann
Newsom, J. D. Scott, and Stanton L. Young. The Committee, composed entirely of
outside directors, held two meetings during the 1998 Fiscal Year. The Audit
Committee reviews and makes recommendations to the Board of Directors
concerning employment of the independent auditors, the proposed annual audit
plan, the completed annual audit, and the Corporation's Corporate Compliance
Program. The Committee also meets periodically with:
 
a. the Corporation's independent auditors to review the Corporation's
   accounting policies, internal controls, and other accounting and auditing
   matters;
 
b. the Corporation's manager of internal auditing to review the Corporation's
   internal auditing program;
 
c. the Corporation's chief financial officer to review the Corporation's
   accounting policy, the results of the annual audit, and the Corporation's
   periodic financial statements; and
 
d. the Corporation's general counsel and compliance officer to review
   outstanding and potential litigation, regulatory proceedings, and other
   significant legal matters.
 
NOMINATING AND CORPORATE GOVERNANCE COMMITTEE
 
  During the 1998 Fiscal Year, members of the Nominating Committee were:
Chairman Bert H. Mackie, Vice Chair Douglas Ann Newsom, Edwyna G. Anderson,
William M. Bell, Larry W. Brummett, Howard R. Fricke, J. M. Graves, and David
L. Kyle. The Committee met once during the 1998 fiscal year. On September 17,
1998,
 
                                       8
<PAGE>
 
the Board of Directors passed a resolution renaming this Committee to the
Nominating and Corporate Governance Committee. The Nominating and Corporate
Governance Committee develops and maintains criteria and procedures for the
identification and recruitment of candidates for Board membership on the basis
of recognized achievements, broad knowledge and experience and the ability to
bring sound business judgment to the deliberations of the Board. The Committee
evaluates the role, composition and structure of the committees and provides
feedback to the Chief Executive Officer on how the committees are functioning.
The Committee evaluates Board practices of other well-managed companies and
recommends appropriate changes to the Board. The Committee reviews corporate
governance issues to ensure continued alignment with shareholder interests and
with respect to the structure, process and proceedings of the Board of
Directors; and considers from time to time the overall relationship of
directors and management. The Committee considers nominees recommended by
shareholders for service on the Board of Directors. Recommendations should be
sent to the Corporate Secretary at the address shown on the front of this
Proxy Statement.
 
EXECUTIVE COMPENSATION COMMITTEE
 
  During the 1998 Fiscal Year, members of the Executive Compensation Committee
were: Chairman William L. Ford, Vice Chair Douglas R. Cummings, J. M. Graves,
Stephen J. Jatras, Gary D. Parker, and Stanton L. Young. Mr. Steven L. Kitchen
was a member of the Executive Compensation Committee until his resignation
from the ONEOK, Inc. Board of Directors effective September 1, 1998. The
Committee, composed entirely of outside directors, held three meetings during
the last fiscal year. The Executive Compensation Committee oversees and
approves all elements of executive compensation, administers the Key Employee
Annual Incentive Plan and the Key Employee Stock Plan, and reports to the
Board all forms and amounts of executive compensation for information,
approval, or ratification, as necessary and appropriate.
 
                 BOARD EXECUTIVE COMPENSATION COMMITTEE REPORT
                           ON EXECUTIVE COMPENSATION
 
  The Executive Compensation Committee (the Committee) is responsible for
overseeing and approving the Corporation's executive compensation policies and
practices and approves all elements of compensation for corporate officers. In
carrying out its duties, the Committee has direct access to independent
compensation consultants and outside survey data. The Committee, which
consists of six outside directors, reports its activities regularly to the
Board of Directors and obtains ratification by the Board of all items of
compensation for the officers of the Corporation, its divisions, and its
subsidiaries.
 
Compensation Philosophy and Practices
 
  The Corporation's executive compensation program is based on the belief that
the interests of executives should be closely aligned with those of the
shareholders. To support this philosophy, the following principles provide a
framework for the compensation program:
 
 .  offer compensation opportunities that attract the best talent to ONEOK;
   motivate individuals to perform at their highest levels; reward outstanding
   achievement; and retain the leadership and skills necessary for building
   long-term shareholder value;
 
 .  maintain a significant portion of executives' total compensation at risk,
   tied to both the annual and long-term financial performance of the
   Corporation, as well as to the creation of shareholder value; and
 
 .  encourage executives to manage from the perspective of owners with an
   equity stake in the Corporation.
 
  ONEOK established the Key Employee Annual Incentive Plan (the Plan) on
August 17, 1995, and it became effective September 1, 1995. The purpose of the
Plan is to provide for compensation that focuses attention on achievement of
the goals set for the Corporation and each of its operating units. The Plan
targets base pay levels
 
                                       9
<PAGE>
 
at approximately 90 percent of the average salaries paid for similar positions
by ONEOK's peer competitors as identified through published surveys, company
documents, and other sources. The Plan is designed to allow the Corporation's
officers the opportunity to earn compensation that is above average when
compared to ONEOK's peer competitors if ONEOK achieves premium results
compared to those competitors and the targeted objectives. The Committee
administers the Plan in accordance with its stated purposes. Participation in
the Plan is provided to executives and other key employees of ONEOK and
subsidiaries selected by the Committee and upon recommendations of the chief
executive officer.
 
  The executive compensation practices are recommended by independent
consultants using industry salary surveys that include the American Gas
Association Executive Compensation Survey, the KPMG Oil and Gas Industry
Compensation Survey, the Effective Compensation Oil and Gas Industry
Compensation Survey, and the Watson Wyatt Worldwide Top Management
Compensation Survey. These surveys include corporations that are
representative of the firms with which ONEOK competes for executive talent and
have jobs similar to those at ONEOK in magnitude, complexity, and scope of
responsibility. Consequently, this is a broader and more diverse set of
companies than those included in the Standard & Poor's Natural Gas
Distribution Index, which is used in the Performance Graph below.
 
Components of Executive Compensation
 
  The compensation for executive officers consists of the following
components. An executive's annual compensation includes the core package
component of base salary and benefits, a bonus award component based on
achievement of certain corporate goals, and a variable component which is
entirely at risk. The variable component is tied to the equity-based criteria
that parallel the interests of the Corporation's shareholders. Base salaries
and bonus awards are established by the Committee based on the executive's job
responsibilities, level of experience, individual performance and contribution
to the business, and information obtained from compensation surveys. Criteria
on which individual performance was evaluated in 1998 were: achievement of
corporate goals, including return on assets, revenue growth, and other
selected goals; other performance, including problem analysis, planning,
organizational ability, directing, decision making, and human, capital, and
material resource utilization; time management; initiation of, and response
to, change; communications and team relations; and personal actions.
 
  The Key Employee Stock Plan (the Plan), as approved by the shareholders,
became effective August 17, 1995. The Plan will remain in effect until Stock
Incentives have been granted with respect to all shares of Common Stock of the
Corporation authorized to be issued and transferred under the Plan, or its
earlier termination. The purpose of the Plan is to provide incentives to
enable the Corporation to attract, retain, and reward key employees and give
such employees an interest parallel to the interests of the Corporation's
shareholders. The Committee administers the Plan and is authorized to make all
decisions and interpretations required to administer and execute the Plan in
accordance with its stated purposes. Participation in the Plan is limited to
key employees of ONEOK, Inc. and subsidiaries, determined by the Committee to
be those employees in a position to contribute significantly to the growth and
profitability of, or to perform services of major importance to the
Corporation or its Subsidiaries. The Plan authorizes the Committee to grant
Stock Incentives to participating key employees in the form selected by the
Committee, including Incentive Stock Options, Non-Statutory Stock Options,
Restricted Stock Awards, and Performance Awards, as defined in the Plan. Stock
Incentives granted under the Plan are subject to the provisions of the Plan
providing for the time and manner of payments and other terms and conditions
as the Committee determines. Stock options granted by the Committee to key
employees may be subject to particular requirements contained in the Internal
Revenue Code, such as the purchase price and term of the option. The maximum
number of shares of Common Stock reserved for issuance under the Plan, as
initially adopted and approved, was 1,000,000 shares, subject to adjustment in
the event of recapitalization, merger, consolidation, or similar events.
Options may include a restoration feature, by which options are granted to
replace shares that are surrendered by participants as full or partial payment
to the Company of the purchase price of shares being acquired through the
exercise of the stock option or shares that are surrendered to satisfy the tax
obligations incident to the exercise of an option. Each restored option shall
have an option price equal to the fair market value of the Common Stock on the
date of grant of the restored
 
                                      10
<PAGE>
 
option and shall expire on the stated expiration date of the original option.
On November 16, 1995, Non- Statutory Stock Options were granted to 57
employees by the Committee for 107,400 shares of Common Stock, exercisable
only after November 16, 1996, and before November 16, 2005. The Committee
granted, on October 10, 1996, Non-Statutory Stock Options totaling 100,700
shares to 63 employees, exercisable only after October 10, 1997, and before
October 10, 2006. On October 16, 1997, the Committee granted 199,000 shares to
82 employees, exercisable only after October 16, 1998, and before October 16,
2007. On January 16, 1998, the Committee granted 45,200 shares to 37 Kansas
Gas Service Company employees, exercisable only after January 16, 1999, and
before January 16, 2008. On October 15, 1998, the Committee granted 284,100
shares to 143 employees exercisable in four equal annual installments
beginning after October 15, 1999, and expiring October 15, 2008. At present, a
balance of 270,700 shares of Common Stock is available for stock incentives
under the Plan.
 
Compensation for the Chief Executive Officer
 
  In considering the annual compensation for Mr. Brummett, who, in addition to
serving the Corporation as Chief Executive Officer, was Chairman of the Board
through August 31, 1998, the Committee relied on the aforementioned surveys to
provide basic information regarding peer positions. The C. A. Turner Utility
Report on financial and stock performance and comparisons of American Gas
Association member companies' operating statistics were also utilized. The
industry statistics have large comparative universes of natural gas
distribution and integrated natural gas companies. The companies in the
Standard & Poor's Natural Gas Distributors' Index, which is part of the
Performance Graph below, are included in the C. A. Turner Utility Report. The
Committee also considers the results of a formal Board of Directors'
Evaluation of Mr. Brummett's performance during the year. The categories in
which his performance is evaluated include: leadership, strategic planning,
financial, management and operations, human resources, and communication. Each
of the categories evaluated contains as many as four areas of specific
performance evaluation. The Committee recommended, and the Board of Directors
approved, a base salary amount of $450,000 which was in the lower range of the
surveys utilized in the studies. Under the award under the Key Employee Stock
Plan Mr. Brummett was granted an option to purchase 25,000 shares of the
Corporation's Common Stack at a purchase price of $32.4063 per share,
exercisable only after October 16, 1998. Mr. Brummett received, under the Key
Employee Annual Incentive Plan, $634,900, which amounted to a total of 58.5
percent of his compensation that related to the Corporation's performance
during the year. Because he was paid at his previously approved salary four
months in the 1998 fiscal year, the actual salary he received in fiscal 1998
was $435,800, and the at-risk portion of his total compensation relating to
the Corporation's performance amounted to 59.3 percent.
 
Federal Income Tax Liability
 
  ONEOK, Inc. has not yet adopted a policy regarding Internal Revenue Code
Section 162(m) regarding a $1 million annual limitation of a Federal income
tax deduction by the Corporation for compensation paid to any executive
officer. This limitation did not apply to ONEOK, Inc. during fiscal year 1998;
however, the Code requirement is being evaluated and the tax regulations are
being closely monitored.
 
Conclusion
 
  The Board believes that the caliber and motivation of ONEOK's leadership are
fundamentally important to achieving the Corporation's objectives as
established by the strategic plan and providing a sound investment for the
shareholders. The Committee is responsible to the Board, and by extension to
the shareholders, for ensuring that officers are compensated in a manner that
is compatible with ONEOK's business strategies, thereby aligning the officers'
interests with those of long-term investors. We believe the current
methodology governing executive compensation standards will prove beneficial
to the Corporation, its shareholders, its customers, and the communities
served.
 
<TABLE>
      <S>                           <C>
      s/ William L. Ford, Chairman  s/ Douglas R. Cummings, Vice Chair
      s/ J. M. Graves               s/ Stephen J. Jatras
      s/ Gary D. Parker             s/ Stanton L. Young
</TABLE>
 
Dated this 15th day of October, 1998.
 
                                      11
<PAGE>
 
     [COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN GRAPH APPEARS HERE]
- ------------------------------------------------------------------------------
12 Months Ended August 31     1993     1994    1995     1996     1997    1998
- ------------------------------------------------------------------------------
ONEOK, Inc.                  100.00    88.76  114.32   150.18   184.78  177.45
- ------------------------------------------------------------------------------
S&P 500 Index                100.00   105.47  128.00   152.08   213.90  231.21
- ------------------------------------------------------------------------------
S&P Natural Gas Distributors 100.00    89.82  101.55   137.52   166.24  161.00
- ------------------------------------------------------------------------------
 
 
  The information provided under the foregoing sections entitled "Board
Executive Compensation Committee Report on Executive Compensation" and
"Performance Graph" shall not be deemed soliciting material or to be filed
with the Securities and Exchange Commission or subject to Regulations 14A or
14C, other than as provided in Item 402 of Regulation S-K, or to the
liabilities of Section 18 of the Securities Exchange Act of 1934, and unless
specific reference is made to such sections in a filing, the information shall
not be incorporated by reference into any such filing under the Securities Act
of 1933 or the Securities Exchange Act of 1934. Additionally, the stock
performance as shown on the Performance Graph shall not be interpreted as a
prediction of future stock performance.
 
                                      12
<PAGE>
 
  The following table sets forth information with respect to certain benefits
made available and compensation paid or accrued by ONEOK, Inc., with respect
to its Chief Executive Officer and its four other most highly compensated
officers (the "named executive officers") for services rendered in all
capacities during the fiscal years ended August 31, 1998, 1997, and 1996.
 
                            EXECUTIVE COMPENSATION
                          SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                ANNUAL COMPENSATION                    LONG-TERM COMPENSATION
                        ----------------------------------- ---------------------------------------------
                                                                   AWARDS                 PAYOUTS
                                                            --------------------- -----------------------
                                                                       SECURITIES
                                                  OTHER     RESTRICTED UNDERLYING
       NAME AND                                   ANNUAL      STOCK     OPTIONS/   LTIP      ALL OTHER
  PRINCIPAL POSITION    YEAR  SALARY   BONUS   COMPENSATION  AWARD(S)     SARS    PAYOUTS COMPENSATION(1)
  ------------------    ---- -------- -------- ------------ ---------- ---------- ------- ---------------
<S>                     <C>  <C>      <C>      <C>          <C>        <C>        <C>     <C>
Larry W. Brummett       1998 $435,800 $634,900     NONE        NONE      25,000    NONE       $12,800
Chairman of the Board,  1997 $400,933  500,000     NONE        NONE      10,000    NONE         9,400
and Chief Executive
Officer                 1996  375,333  423,400     NONE        NONE      17,600    NONE         8,993
David L. Kyle           1998 $317,472 $400,000     NONE        NONE      17,500    NONE       $12,800
President and Chief     1997 $297,600  375,000     NONE        NONE       8,000    NONE         9,400
Operating Officer       1996  275,333  278,600     NONE        NONE      11,000    NONE         9,000
Eugene N. Dubay         1998 $201,233 $209,900     NONE        NONE      10,000    NONE       $10,000
President--Kansas Gas   1997 $166,850  250,000     NONE        NONE       2,500    NONE         3,200
Service Company         1996   45,000   25,080     NONE        NONE        NONE    NONE           -0-
James C. Kneale         1998 $191,677 $167,900     NONE        NONE       6,600    NONE       $ 9,234
President--Oklahoma     1997  143,733  105,340     NONE        NONE       2,500    NONE         8,620
Natural Gas Company     1996  128,667   60,835     NONE        NONE       2,500    NONE         7,712
Jerry D. Neal           1998 $168,000 $ 85,400     NONE        NONE       5,900    NONE       $ 9,600
Vice President,
Treasurer               1997 $166,066 $102,600     NONE        NONE       2,500    NONE         9,400
and CFO                 1996  162,200   84,240     NONE        NONE       2,500    NONE         8,993
</TABLE>
- --------
(1) ONEOK, Inc.'s contribution to the Thrift Plan for Employees of ONEOK, Inc.
    and Subsidiaries.
 
                                      13
<PAGE>
 
                                 STOCK OPTIONS
 
  The following table provides information concerning options to purchase
Common Stock of the Corporation granted to the named executive officers in
Fiscal year 1998.
 
              OPTION/SAR GRANTS IN LAST COMPLETED FISCAL YEAR(1)
 
<TABLE>
<CAPTION>
                                                                 POTENTIAL
           NUMBER OF                                          REALIZABLE VALUE
           SECURITIES       % OF TOTAL                       AT ASSUMED ANNUAL
           UNDERLYING      OPTIONS/SARS                        RATES OF STOCK
            OPTIONS/        GRANTED TO  EXERCISE             PRICE APPRECIATION
              SARS          EMPLOYEES   OR BASE             FOR OPTION TERM (2)
            GRANTED             IN       PRICE   EXPIRATION --------------------
NAME           #           FISCAL YEAR   ($/SH)     DATE       5%        10%
- ----       ----------      ------------ -------- ---------- --------------------
<S>        <C>             <C>          <C>      <C>        <C>      <C>
Larry W.
 Brummett    25,000           8.87%     $32.4063  10-16-07   498,252 $ 1,273,266
             11,662(3)(10)    4.14%     $35.7500  11-16-05   192,135     458,664
              7,517(4)(10)    2.67%     $35.7500  10-10-06   141,440     346,110
David L.
 Kyle        17,500           6.21%     $32.4063  10-16-07   348,776     891,286
              5,919(5)(10)    2.10%      35.7500  11-16-05    97,517     232,793
              1,369(6)(10)     .49%      35.7500  11-16-05    22,555      53,843
              6,013(7)(10)    2.13%      35.7500  10-10-06   113,141     276,861
Eugene N.
 Dubay       10,000           3.55%     $32.4063  10-16-07   199,301     509,306
James C.
 Kneale       6,600           2.34%     $32.4063  10-16-07   131,539     336,142
              1,391(8)(10)    0.49%      42.5313  11-16-05    28,854      66,487
              1,974(9)(10)    0.70%      34.0313  10-10-06    37,172      91,186
Jerry D.
 Neal         5,900           2.09%     $32.4063  10-16-07   117,588     300,491
</TABLE>
- --------
(1)No SARs were granted in Fiscal Year 1998 to any of the named executive
officers.
 
(2) Potential realizable value is the amount that would be realized upon
    exercise by the named executive officer of the options immediately prior
    to the expiration of their respective terms, assuming the specified
    compound annual rates of appreciation on Common Stock over the respective
    terms of the options. These amounts represent assumed rates of
    appreciation only. Actual gains, if any, on stock option exercises depend
    on the future performance of the Common Stock and overall market
    conditions. There can be no assurances that the potential values reflected
    in this table will be achieved.
 
(3) This is a Restored Option. The original option became exercisable on
    November 16, 1996.
 
(4) This is a Restored Option. The original option became exercisable on
    October 10, 1997.
 
(5) This is a Restored Option. The original option became exercisable on
    November 16, 1996.
 
(6) This is a Restored Option. The original option became exercisable on
    November 16, 1996.
 
(7) This is a Restored Option. The original option became exercisable on
    November 16, 1996.
 
(8) This is a Restored Option. This was an exercise of a restored, non-
    statutory stock option which originally became exercisable on November 16,
    1996.
 
(9) This is a Restored Option. The original option became exercisable on
    October 10, 1996.
 
(10) The stock option agreement provided that an additional option may be
     granted if and when the optionee exercises all or part of his option
     using Common Stock to pay the purchase price of the option or to satisfy
     tax obligations incident to the exercise of the option. This additional
     option will be exercisable for the number of shares tendered in payment
     of the option price or used to satisfy any tax obligation, and will be
     exercisable at any time after the date of grant (or at any other time as
     determined by the Corporation) and will expire on the expiration date of
     the original option.
 
                                      14
<PAGE>
 
                     AGGREGATED STOCK OPTIONS EXERCISED IN
               FISCAL YEAR 1998 AND YEAR-END STOCK OPTION VALUES
 
<TABLE>
<CAPTION>
                               NUMBER OF SECURITIES
            SHARES            UNDERLYING UNEXERCISED     VALUE OF UNEXERCISED
           ACQUIRED              OPTIONS AT FISCAL      IN-THE-MONEY OPTIONS AT
              ON     VALUE         YEAR END (#)         FISCAL YEAR-END ($) (1)
           EXERCISE REALIZED ------------------------- -------------------------
NAME         (#)      ($)    EXERCISABLE UNEXERCISABLE EXERCISABLE UNEXERCISABLE
- ----       -------- -------- ----------- ------------- ----------- -------------
<S>        <C>      <C>      <C>         <C>           <C>         <C>
Larry W.
 Brummett   27,600  $301,006      -0-       44,179       $   -0-       $-0-
David L.
 Kyle       19,000  $203,660      -0-       30,801       $   -0-       $-0-
Eugene N.
 Dubay       2,500  $ 11,094      -0-       10,000       $   -0-       $-0-
James C.
 Kneale      4,429  $ 40,733      -0-        9,965       $   -0-       $-0-
Jerry D.
 Neal          -0-  $    -0-    5,000        5,900       $28,900       $-0-
</TABLE>
- --------
(1) Based on per share price for Company Common Stock of $31.0625 per share.
    The price reflects the average of the high and low trading price on the
    New York Stock Exchange on August 31, 1998.
 
                                 PENSION PLANS
 
PENSION PLAN TABLE
 
                           ESTIMATED ANNUAL BENEFITS
                 UNDER FINAL-AVERAGE EARNINGS (1) (2) (3) (4)
 
<TABLE>
<CAPTION>
                                                  YEARS OF SERVICE
                                    --------------------------------------------
REMUNERATION                           15       20       25       30       35
- ------------                        -------- -------- -------- -------- --------
<S>                                 <C>      <C>      <C>      <C>      <C>
$125,000........................... $ 44,540 $ 53,918 $ 63,297 $ 72,675 $ 82,053
$150,000...........................   53,915   65,325   76,734   88,143   99,553
$175,000...........................   63,290   76,731   90,172  103,612  117,053
$200,000...........................   72,665   88,137  103,609  119,081  134,553
$225,000...........................   82,040   99,543  117,047  134,550  152,053
$250,000...........................   91,415  110,950  130,484  150,018  169,553
$300,000...........................  110,165  133,762  157,359  180,956  204,553
$400,000...........................  147,665  179,387  211,109  242,831  274,553
$450,000...........................  166,415  202,200  237,984  273,768  309,553
$500,000...........................  185,165  225,012  264,859  304,706  344,553
</TABLE>
- --------
(1) For purposes of the above table, the annual Social Security Covered
    Compensation benefit ($31,128) was used in the excess benefit calculation.
 
(2) Under the Internal Revenue Code, the annual compensation of each employee
    to be taken into account under the Retirement Plan cannot exceed $150,000,
    adjusted for increases in the cost of living, for plan years beginning
    after December 31, 1993. The maximum amount for 1998, as adjusted, is
    $160,000.
 
(3) Amounts are estimates only and would be subject to adjustment based on
    rules and regulations applicable to the method of distribution and
    survivor benefit options selected by the retiree. Retirement benefits
    would be actuarially reduced for retirement prior to age 65.
 
(4) The compensation covered by the Retirement Plan benefit formula is the
    basic salary paid to an employee within the employee's final average
    earnings. The final average earnings means the employee's highest earnings
    during any sixty consecutive months during the entire period of
    employment. For any employee named or shown in the Summary Compensation
    Table who retires with vested benefits under the Plan, the compensation
    shown as "salary" in the Summary Compensation Table could be considered
    covered compensation in determining benefits, except that the Plan benefit
    formula takes into account only a fixed percentage of final average
    earnings which is uniformly applied to all employees. The amount of
    covered compensation that may be considered in calculating retirement
    benefits is also subject to limitations in the Internal Revenue Code
    applicable to the Plan.
 
                                      15
<PAGE>
 
  The RETIREMENT PLAN FOR EMPLOYEES OF ONEOK, INC. AND SUBSIDIARIES and the
ONEOK, INC. KGS RETIREMENT PENSION PLAN (RETIREMENT PLANS) are tax-qualified,
defined-benefit pension plans under the Internal Revenue Code and the Employee
Retirement Income Security Act of 1974. In Plan years prior to 1989, benefits
became vested and nonforfeitable after completion of ten years of continuous
employment; and in Plan years after 1988, benefits become vested and
nonforfeitable after completion of five years of continuous employment. A
vested participant receives the retirement benefit upon attaining retirement
age under the Retirement Plan notwithstanding an earlier separation from
service. Benefits (joint and survivor for married participants unless they
otherwise elect) are calculated at retirement date based on credited service,
limited to a maximum of 35 years, and final average earnings; and monthly
benefits are distributed by an insurance company. At August 31, 1998, the
executive officers named in the Summary Compensation Table had the following
credited service under the Plan, respectively: Larry W. Brummett, 23 years and
2 months; Eugene N. Dubay, 1 year and 4 months; James C. Kneale, 16 years and
4 months; David L. Kyle, 23 years and 2 months; and Jerry D. Neal, 35 years.
 
  The maximum annual benefits for employees in higher salary classifications
retiring at age 65 with the specified years of service are as shown in the
Pension Plan Table above. There are a number of options available to a
retiring employee such as the method of distribution and survivor benefit
options, which, when selected by the retiree, could result in reduced monthly
pension payments. Retirement benefits also would be actuarially reduced for
retirement prior to age 65.
 
  The SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (SERP) and the ONEOK, INC.
SUPPLEMENT EXECUTIVE RETIREMENT PLAN FOR KGS EMPLOYEES cover elected officers
of the Corporation, appointed officers of the Corporation, and certain other
highly compensated employees in the management of the Corporation who are
selected for participation by the Executive Compensation Committee and
approved by the Board of Directors and who are also eligible to receive
limited benefits from the Retirement Plan. An administrative committee
interprets and administers the SERP. The benefit payable to an employee under
the SERP is an amount, which when combined with pension benefits payable to
the employee from the Retirement Plan and any retirement plans (other than
401K plans) of any of the employee's former employers, will provide the
specified percentage of the highest 36 consecutive months' compensation of the
employee's last 60 months of service. The percentage is reduced for early
retirement. The SERP will in any case pay a benefit equal to the benefit which
would be payable to the employee under the Retirement Plan if the limitations
prescribed by Sections 401(a)(17) and 415 of the Internal Revenue Code of
1986, as amended, were not applicable, less the benefit payable under the
Retirement Plan with such limitations. Benefits under the SERP are paid
coincidentally with the payment of benefits under the Retirement Plan or as
the administrative committee may determine. These benefits are unfunded and
are payable from the general assets of the Corporation. The Board of Directors
may amend or terminate the SERP at any time; however, benefits accrued prior
to termination of the SERP will not be affected.
 
                         TERMINATION OF EMPLOYMENT AND
                        CHANGE OF CONTROL ARRANGEMENTS
 
  On January 19, 1984, a Severance Pay Policy (Policy) was adopted, which
includes the officers of the Corporation; and termination agreements
(Termination Agreements) were authorized, which have been entered into with
the officers of the Corporation. Under the Policy, if within two years of any
change of control, employment is terminated, including voluntary termination
following a material adverse change in compensation, responsibility, and/or
working conditions, the officer would receive severance pay equal to eight
weeks' pay for each full year of service. Under the Termination Agreements, if
within three years of a change of control, an officer is terminated, including
voluntary termination under certain conditions, the officer would receive a
lump-sum termination payment equal to three times annual salary and bonus, if
any, and normal retirement and other employee benefits for three years. Change
of control occurs when a person or group acquires beneficial ownership of
twenty percent (20%) or more of the voting power of the Corporation; or if
after a transaction-- including a cash tender or exchange offer, merger or
other business combination, sale of assets, contested election, or any
combination thereof--the directors, prior to such transaction, cease to
constitute a majority of
 
                                      16
<PAGE>
 
the Board of Directors of the Corporation or its successor. Assuming a change
of control and termination of their employment on August 31, 1998, the
Executive Officers named in the Summary Compensation Table, All Current
Executive Officers as a Group, and All Other Current Officers as a Group would
have been entitled to receive the following payments under the Policy and
their Termination Agreements, respectively: Larry W. Brummett, $1,661,580 and
$3,359,958; David L. Kyle, $1,200,060 and $2,280,282; Eugene N. Dubay, $62,771
and $1,346,958; James C. Kneale, $523,132 and $1,209,006; and Jerry D. Neal,
$930,485 and $865,349. All Current Executive Officers as a Group, $5,026,043
and $10,937,355; and All Other Current Officers as a Group, $6,534,126 and
$15,267,823.
 
                                PROPOSAL NO. 1
 
                             ELECTION OF DIRECTORS
 
  As of January 21, 1999, the Board of Directors will consist of 13 members.
The Board is divided into three Classes (A, B, and C) consisting of 4, 5, and
4 members respectively. Each Class is elected for a term of three years, with
the term of one class expiring at each annual meeting of shareholders.
 
  The By-laws of the Corporation provide that a person shall not be elected or
reelected to the Board of Directors after the person's 70th birthday. Two
directors in Class B, Mr. J. M. Graves and Mr. Stephen J. Jatras, can not
stand for reelection this year. Upon a recommendation of the Nominating and
Corporate Governance Committee, the Board approved a voluntary plan to move D.
L. Kyle from his current class to Class B, with Mr. Kyle's concurrence. The
purpose of the plan is to keep an even distribution of directors among the
classes. Also, effective September 30, 1998, Mr. Steven L. Kitchen resigned
from the Board of Directors and Mr. Douglas T. Lake was nominated by Western
Resources, Inc. ("WRI") under the terms of a certain shareholder agreement
(the "Shareholder Agreement") between WRI and the Company, and was
subsequently elected by the Board on October 15, 1998, to serve as Mr.
Kitchen's replacement in Class A. However, under the terms of the Shareholder
Agreement, Mr. Lake may only serve until the Company's immediately succeeding
annual meeting of shareholders after election by the Board. Therefore, at the
Annual Meeting of Shareholders to be held January 21, 1999, five directors
will be elected: four directors to Class B for three-year terms and one
director to Class A for a two-year term. Assuming reelection by the
shareholders of the current nominees for directors, the result would be four
directors in Class B, five directors in Class C, and four directors in Class
A.
 
  The nominees for directors in Class B are William M. Bell, Douglas R.
Cummings, Howard R. Fricke, and David L. Kyle, and the nominee for director in
Class A is Douglas T. Lake. Should any of the nominees for the office of
director become unable to accept nomination or election, it is intended that
the persons named in the accompanying form of proxy will vote for the election
of such other person for such office as the Board of Directors may recommend
in the place of such nominee.
 
                                PROPOSAL NO. 2
 
             PROPOSAL TO APPROVE THE AMENDMENT TO AND RESTATEMENT
                        OF THE KEY EMPLOYEE STOCK PLAN
 
  The Board of Directors has adopted, subject to shareholder approval, certain
amendments to the ONEOK, Inc. Key Employee Stock Plan (Plan). These amendments
include a change of the name of the Plan to be the ONEOK, Inc. Long-Term
Incentive Plan. The Plan was originally approved by the shareholders at the
1995 Annual Meeting. The amendment increases the number of shares subject to
the Plan, modifies definitional terms governing the granting of stock
incentives, and provides for payment of non-employee director compensation in
the form of stock awards. Should the amendment not be approved, the original
Plan will remain in full force and effect. The following summary of the
material features of the Plan, as amended and restated, is in all respects
subject to and qualified by reference to the actual text of the amended and
restated Plan, which appears in its entirety in Exhibit A to this Proxy
Statement.
 
                                      17
<PAGE>
 
GENERAL INFORMATION
 
  The purposes of the Plan are to provide competitive incentives that will
enable the Corporation to attract, retain, motivate and reward key employees
and non-employee directors, and to give key employees and non-employee
directors an interest parallel to the interests of the Corporation's
shareholders.
 
  The Plan authorizes the Compensation Committee of the Board of Directors
(the Committee) to grant eligible employees options to purchase shares of
ONEOK, Inc. Common Stock, $0.01 par value (Common Stock), which qualify for
the special tax treatment according to incentive stock options. (Incentive
Stock Options) under Section 422 of the Internal Revenue Code of 1986, as
amended (the Code), as well as options to purchase shares of Common Stock
which do not so qualify (Non-Statutory Stock Options). The Plan, also
authorizes the Committee to grant eligible employees stock bonus awards,
restricted stock awards, and performance unit awards, and to grant non-
employee directors stock awards. The variety of stock incentive awards
authorized to be granted under the Plan, as well as the wide discretion which
the Plan confers upon the Committee to determine the terms and conditions of
the awards, are intended to give the Committee flexibility to adapt the
Corporation's equity-based compensation practices to the changing business and
regulatory environment in which it operates.
 
  If approved by shareholders, the Plan will remain in effect until stock
incentives have been granted with respect to all shares of Common Stock
authorized to be issued or transferred under the Plan or until the Plan is
sooner terminated by the Board of Directors. In accordance with applicable
provisions of the Code, no Incentive Stock Options may be granted under the
Plan after August 17, 2005.
 
  A total of 2,000,000 shares of Common Stock (of which 554,800 remained
available for grant as of August 31, 1998, from the number of shares reserved
upon the Plan's initial adoption in 1995) may be issued or transferred
pursuant to stock incentives granted under the Plan. Such shares may be
authorized and unissued shares or treasury shares or any combination thereof.
The Plan authorizes the Corporation to issue or transfer sufficient shares of
Common Stock to a trust (including a grantor trust) at any time, including
upon or in contemplation of a Change in Control, as defined below, to satisfy
its obligations under any then-outstanding awards previously granted under the
Plan (including stock options), in which case the shares may be treated as
authorized and issued shares while held in the trust with full dividend and
voting rights, whether or not the related awards are then vested or
exercisable. The maximum number of shares of Common Stock with respect to
which stock options or other stock incentives may be granted to an employee
during any year is 150,000 shares. Shares that cease to be issuable under an
award because of the termination, expiration, cancellation, or forfeiture of
the award, or because of the employee's failure to satisfy the terms and
conditions of the award will not count against the foregoing limitations and
may again be made subject to awards under the Plan. The Plan provides for the
number and class of shares authorized to be issued or transferred under the
Plan, the maximum number and class of shares with respect to which stock
options or other stock incentives may be granted to any employee, the number
and class of shares subject to outstanding grants, and the exercise price of
outstanding stock options to be adjusted equitably to prevent dilution or
enlargement of rights in the event of recapitalizations, stock splits, stock
dividends, mergers, and similar transactions.
 
  The class of persons who are eligible to be selected to participate in the
Plan consists of any employee of the Corporation or its subsidiaries,
including an officer or member of the Board of Directors who is an employee,
who the Committee determines is in a position to contribute significantly to
the growth and profitability of, or to perform services of major importance
to, the Corporation and its subsidiaries, and any non-employee director. Non-
employee directors may be granted stock awards, instead of cash, for all or a
part of their compensation for service as a director of the Corporation. The
approximate number of persons who are eligible to be selected to participate
in the Plan at the present time includes 143 employees and 13 non-employee
directors, and is subject to change.
 
  The Plan is administered by the Committee, which, within the parameters set
forth in the Plan, determines the type of awards to grant, selects
participants from the class of employees eligible to participate, determines
the number of shares of Common Stock to be subject to each award, and
determines the terms and conditions of
 
                                      18
<PAGE>
 
the awards (including the exercise price of options). The Committee interprets
the Plan and is authorized to make all determinations and decisions
thereunder. Under the Plan, the Committee must consist of two or more members
of the Board of Directors, each of whom qualifies as a "non-employee director"
under Securities and Exchange Commission (SEC) Rule 16b-3 and as an "outside
director" within the meaning of Section 162(m) of the Code, unless the
Corporation's Board of Directors determines otherwise.
 
  Unless the Committee determines otherwise, transactions by executive
officers and directors under the Plan are intended to qualify for the
exemptions available under SEC Rule 16b-3, and awards granted to executive
officers are intended to qualify as "performance-based compensation" if such
qualification is necessary to preserve the Corporation's deduction for such
awards under Code Section 162(m). The Plan is specifically intended to give
the Committee authority to grant awards that will qualify as "performance-
based compensation" as well as awards that will not so qualify.
 
  The Plan also authorizes the Committee, after a stock incentive has been
granted and without consideration, to waive any term or condition that could
have been omitted from the award when it was granted and to amend the award to
include or exclude any term or condition that could have been included or
excluded from the award when it was granted.
 
  The market value of a share of Common stock on November 24, 1998, the latest
practicable date before publication of this proxy statement, was $    .
 
                      BOARD OF DIRECTORS' RECOMMENDATION
 
                 THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS
                    A VOTE FOR THE ADOPTION OF PROPOSAL 2.
 
                                PROPOSAL NO. 3
 
              RATIFICATION AND APPROVAL OF APPOINTMENT OF AUDITOR
 
  The Board of Directors, based on the recommendation of the Audit Committee,
appointed the firm of KPMG Peat Marwick LLP independent auditor to examine the
books of account and other records of the Corporation and its consolidated
subsidiaries for the 1999 Fiscal Year. The Board of Directors is asking the
shareholders to ratify and approve this action. KPMG Peat Marwick LLP has been
the Corporation's independent auditor since 1951, and the audit engagement
partner is normally rotated every five years. Representatives of the auditing
firm will be present at the meeting and will be afforded the opportunity, if
they so desire, to make a statement or respond to appropriate questions that
may come before the meeting.
 
  Although such ratification is not required by law, the Board of Directors
believes that shareholders should be given the opportunity to express their
views on the subject. The Board has asked for such ratification since 1983.
While not binding on the Board of Directors, the failure of the shareholders
to ratify the appointment of KPMG Peat Marwick LLP as the Corporation's
independent auditor would be considered by the Board in determining whether or
not to continue with the services of KPMG Peat Marwick LLP.
 
                             SHAREHOLDER PROPOSALS
 
  For any shareholder proposal to be considered for inclusion in the Proxy
Statement relating to the 2000 Annual Meeting of Shareholders, such proposals
must be received by the Corporation on or before August 13, 1999.
 
                                      19
<PAGE>
 
                                 OTHER MATTERS
 
  The management of the Corporation knows of no other matters that are likely
to be brought before the meeting.
 
  The Corporation's Annual Report on Form 10-K for the fiscal year ended
August 31, 1998, as filed with the Securities and Exchange Commission, is
being delivered to stockholders with this Notice and Proxy Statement.
 
Tulsa, Oklahoma
November 30, 1998
 
                                      20
<PAGE>
 
                                   EXHIBIT A
 
                                  ONEOK, INC.
                           LONG-TERM INCENTIVE PLAN
 
1. PURPOSES.
 
  The purposes of this Plan are (a) to provide competitive incentives that
will enable the Company to attract, retain, motivate, and reward Key Employees
and Non-Employee Directors of the Company, and (b) to give the Company's Key
Employees and Non-Employee Directors an interest parallel to the interests of
the Company's shareholders generally.
 
2. DEFINITIONS.
 
  Unless otherwise required by the context, the following terms, when used in
this Plan, shall have the meanings set forth in this Section 2.
 
(a) "Beneficiary" means a person or entity (including a trust or estate),
    designated in writing by a Participant on such forms and in accordance
    with such terms and conditions as the Committee may prescribe, to whom the
    Participant's rights under the Plan shall pass in the event of the death
    of the Participant.
 
(b) "Board" or "Board of Directors" means the Board of Directors of the
    Company, as constituted from time to time.
 
(c) "Change in Control" means any of the following:
 
  (i) any person (as such term is used in Sections 13(d) and 14(d)(2) of the
      Exchange Act), other than the Company, a Subsidiary, an employee
      benefit plan of the Company or a Subsidiary, or any person acting on
      behalf of the Company or a Subsidiary in a distribution of stock to the
      public, becomes the beneficial owner (as defined in Rule 13d-3 under
      the Exchange Act), directly or indirectly, of securities of the Company
      representing more than fifteen percent of the combined voting power of
      the Company's then outstanding securities;
 
  (ii) shareholders of the Company approve (A) an agreement for the sale or
       disposition of all or substantially all of the Company's assets to an
       entity which is not a Subsidiary or owned by shareholders of the
       Company in substantially the same proportions as their ownership of
       Common Stock, (B) a plan of complete liquidation, or (C) a
       consolidation or merger of the Company in which the Company is not the
       continuing or surviving corporation or pursuant to which shares of
       Common Stock would be converted into cash, securities or other
       property, other than a merger in which the holders of Common Stock
       immediately prior to the merger will have substantially the same
       proportionate ownership of common stock of the surviving corporation
       immediately after the merger; or
 
  (iii) the persons who were members of the Board of Directors immediately
        before a tender or exchange offer by any person other than the
        Company or a Subsidiary, or before a merger, consolidation, or
        contested election, or before any combination of such transactions,
        cease to constitute a majority of the Board of Directors as a result
        of such transaction or transactions.
 
(d) "Code" means the Internal Revenue Code of 1986, as amended and in effect
    from time to time. References to a particular section of the Code shall
    include references to any related Treasury Regulations and to successor
    provisions.
 
                                      A-1
<PAGE>
 
(e) "Committee" means the Committee appointed by the Board of Directors to
    administer the Plan pursuant to the provisions of section 11(a) below.
 
(f) "Common Stock" means common stock, $.01 par value, of the Company.
 
(g) "Company" means ONEOK, Inc., an Oklahoma corporation its successors and
    assigns.
 
(h) "Director Fees" means all compensation and fees paid to a Non-Employee
    Director by the Company for his services as a member of the Board of
    Directors.
 
(i) "Director Stock Award" means an award of ONEOK, Inc. Common Stock granted
    to a Non-Employee Director.
 
(j) "Exchange Act" means the Securities Exchange Act of 1934, as amended from
    time to time.
 
(k) "Fair Market Value" on a particular date means the average of the high and
    low sale prices of a share of Common Stock in consolidated trading on the
    date in question as reported by The Wall Street Journal or another
    reputable source designated by the Committee; provided that if there were
    no sales on such date reported as provided above, the respective prices on
    the most recent prior day for which a sale was so reported. In the case of
    an Incentive Stock Option, if the foregoing method of determining Fair
    Market Value should be inconsistent with section 422 of the Code, "Fair
    Market Value" shall be determined by the Committee in a manner consistent
    with such section of the Code and shall mean the value as so determined.
 
(l) "General Counsel" means the General Counsel of the Company serving from
    time to time.
 
(m) "Incentive Stock Option" means an option, including an Option as the
    context may require, intended to qualify for the tax treatment applicable
    to incentive stock options under section 422 of the Code.
 
(n) "Key Employee" means an employee of the Company or a Subsidiary, including
    an officer or director who is such an employee, who the Committee
    determines is in a position to contribute significantly to the growth and
    profitability of, or to perform services of major importance to, the
    Company and its Subsidiaries.
 
(o) "Non-Employee Director" means a member of the Board of Directors of the
    Company who is not an employee of the Company, and who qualifies as a
    "Non-Employee Director" under the definition of that term in SEC Rule 16b-
    3.
 
(p) "Non-Statutory Stock Option" means an option, including an Option as the
    context may require, which is not intended to qualify for the tax
    treatment applicable to incentive stock options under section 422 of the
    Code.
 
(q) "Option" means an option granted under this Plan to purchase shares of
    Common Stock. Options may be Incentive Stock Options or Non-Statutory
    Stock Options.
 
(r) "Participant" means a Key Employee or Non-Employee Director who has been
    granted a Stock Incentive.
 
(s) "Performance Unit Award" means an amount of cash or shares of Common Stock
    or a combination of each, that will be distributed in the future if
    continued employment and/or other performance objectives or contingencies
    specified by the Committee are attained. Such other performance objectives
    may include, without limitation, corporate, divisional or business unit
    financial or operating performance measures and such other contingencies
    may include the Participant's depositing with the Company, acquiring or
    retaining for stipulation time periods specified amounts of Common Stock.
    The amount of the award may but need not be determined by reference to the
    market value of Common Stock.
 
                                      A-2
<PAGE>
 
(t) "Plan" means the ONEOK, Inc. Long-Term Incentive Plan set forth in these
    pages, as amended from time to time.
 
(u) "Plan Year" means the calendar year beginning on January 1 and ending the
    next December 31.
 
(v) "Restricted Stock Award" means shares of Common Stock which are issued or
    transferred to a Participant under Section 5 below and which will become
    free of restrictions specified by the Committee if continued employment
    and/or other performance objectives or contingencies specified by the
    Committee are attained. Such other performance objectives may include,
    without limitation, corporate, divisional or business unit financial or
    operating performance measures and such other contingencies may include
    the Participant's depositing with the Company, acquiring or retaining for
    stipulated time periods specified amounts of Common Stock.
 
(w) "SEC Rule 16b-3" means Rule 16b-3 of the Securities and Exchange
    Commission promulgated under the Exchange Act, as such rule or any
    successor rule may be in effect from time to time.
 
(x) "Section 16 Person" means a person subject to Section 16(b) of the
    Exchange Act with respect to transactions involving equity securities of
    the Company.
 
(y) "Stock Bonus Award" means an amount of cash or shares of Common Stock
    which is distributed to a Participant or which the Committee agrees to
    distribute in the future to a Participant in lieu of, or as a supplement
    to, any other compensation that may have been earned by services rendered
    prior to the date the distribution is made. The amount of the award may
    but need not be determined by reference to the market value of Common
    Stock. Performance Unit Awards and Restricted Stock Awards are specific
    types of Stock Bonus Awards.
 
(z) "Stock Incentive" means an award granted under this Plan in one of the
    forms provided for in Section 3.
 
(aa) "Subsidiary" means a corporation or other form of business association of
     which shares (or other ownership interest) having more than 50 percent of
     the voting power are or in the future become owned or controlled,
     directly or indirectly, by the Company; provided, however, that in the
     case of an Incentive Stock Option, the term "Subsidiary" shall mean a
     Subsidiary (as defined by the preceding clause) which is also a
     "subsidiary corporation" as defined in Section 424(f) of the Code.
 
3. GRANTS OF STOCK INCENTIVES
 
(a) Subject to the provisions of the Plan, the Committee may at any time, or
    from time to time, grant Key Employees Stock Bonus Awards, which may but
    need not be Performance Unit Awards or Restricted Stock Awards, and/or
    Options, which may be Incentive Stock Options or Non-Statutory Stock
    Options.
 
(b) Subject to the provisions of the Plan, the Committee shall grant Director
    Stock Awards to Non-Employee Directors in accordance with Section 7 of the
    Plan. Notwithstanding anything else otherwise expressed or implied in the
    Plan, no other form of Stock Incentive shall be granted to Non-Employee
    Directors under the Plan, and in no event shall any grant of an Incentive
    Stock Option be made to a Non-Employee Director.
 
(c) After a Stock Incentive has been granted,
 
  (i) the Committee may waive any term or condition thereof that could have
      been excluded from such Stock Incentive when it was granted, and
 
  (ii) with the written consent of the affected Participant, may amend any
       Stock Incentive after it has been granted to include (or exclude) any
       provision which could have been included in (or excluded from) such
       Stock Incentive when it was granted,
 
 
                                      A-3
<PAGE>
 
     and no additional consideration need be received by the Company in
     exchange for such waiver or amendment.
 
4. STOCK SUBJECT TO THE PLAN
 
(a) The maximum number of shares of Common Stock which was authorized to be
    issued or transferred pursuant to Stock Incentives to be granted under the
    Plan upon the Plan's initial adoption on August 17, 1995, was 1,000,000
    shares of Common Stock ("Initially Authorized Shares"), of which 554,800
    shares remain available for grant as of August 20, 1998; and the Board has
    authorized that the amount of those shares remaining eligible to be
    granted on the effective date of the Plan, as amended and restated, be
    carried over and continued to be reserved, together with reservation of an
    additional number of shares necessary to have a total of 2,000,000 shares
    of Common Stock which may be issued or transferred pursuant to Stock
    Incentives granted under the Plan on and after the date of such amendment
    and restatement of the Plan, subject to the provisions below of paragraph
    4(c) and of Section 9; provided, that the maximum number of shares of
    Common Stock with respect to which Options or other Stock Incentives may
    be granted or issued to any employee under the Plan during any year is
    150,000.
 
(b) Such shares may be authorized but unissued shares of Common Stock, shares
    of Common Stock held in treasury, whether acquired by the Company
    specifically for use under this Plan or otherwise, or shares issued or
    transferred to, or otherwise acquired by, a trust pursuant to paragraph
    12(d) below, as the Committee may from time to time determine, provided,
    however, that any shares acquired or held by the Company for the purposes
    of this Plan shall, unless and until issued or transferred to a trust
    pursuant to paragraph 12(d) below or to a Participant in accordance with
    the terms and conditions of a Stock Incentive, be and at all times remain
    authorized but unissued shares or treasury shares (as the case may be),
    irrespective of whether such shares are entered in a special account for
    purposes of this Plan, and shall be available for any corporate purpose.
 
(c) If any shares of Common Stock subject to a Stock Incentive shall not be
    issued or transferred to a Participant and shall cease to be issuable or
    transferable to a Participant because of the termination, expiration or
    cancellation, in whole or in part, of such Stock Incentive or for any
    other reason, or if any such shares shall, after issuance or transfer, be
    reacquired by the Company because of the Participant's failure to comply
    with the terms and conditions of a Stock Incentive or for any other
    reason, the shares not so issued or transferred, or the shares so
    reacquired by the Company, as the case may be, shall no longer be charged
    against the limitations provided for in paragraph (a) above of this
    Section 4 and may again be made subject to Stock Incentives; provided that
    the number of shares not so issued or transferred and any such reacquired
    shares may again be made subject to Stock Incentives for Section 16
    Persons only if the General Counsel determines that doing so would not
    jeopardize any exemption from Section 16 of the Exchange Act (including
    without limitation SEC Rule 16b-3) for which the Company intends Section
    16 Persons to qualify. If a Participant pays the purchase price of shares
    subject to an Option by surrendering shares of Common Stock in accordance
    with the provisions of paragraph 6(b)(iv) below, the number of shares
    surrendered shall be added back to the number of shares available for
    issuance or transfer under the Plan so that the maximum number of shares
    that may be issued or transferred under the Plan pursuant to paragraph
    4(a) above shall have been charged only for the net number of shares
    issued or transferred pursuant to the Option exercise.
 
5. STOCK BONUS AWARDS, PERFORMANCE UNIT AWARDS AND RESTRICTED STOCK AWARDS
 
  Stock Bonus Awards, Performance Unit Awards and Restricted Stock Awards
shall be subject to the following provisions:
 
(a) A Key Employee may be granted a Stock Bonus Award, Performance Unit Award
    or Restricted Stock Award, and a Non-Employee Director may be granted a
    Director Stock Award, whether or not he or she is
 
                                      A-4
<PAGE>
 
   eligible to receive similar or dissimilar incentive compensation under any
   other plan or arrangement of the Company.
 
(b) Shares of Common Stock subject to a Stock Bonus Award may be issued or
    transferred to a Participant at the time such Award is granted, or at any
    time subsequent thereto, or in installments from time to time, and subject
    to such terms and conditions, as the Committee shall determine. In the
    event that any such issuance or transfer shall not be made to the
    Participant at the time such Award is granted, the Committee may but need
    not provide for payment to such Participant, either in cash or shares of
    Common Stock, from time to time or at the time or times such shares shall
    be issued or transferred to such Participant, of amounts not exceeding the
    dividends which would have been payable to such Participant in respect of
    such shares (as adjusted under Section 9) if such shares had been issued
    or transferred to such Participant at the time such Award was granted.
 
(c) Any Stock Bonus Award, Performance Unit Award or Restricted Stock Award
    may, in the discretion of the Committee, be settled in cash, on each date
    on which shares would otherwise have been delivered or become
    unrestricted, in an amount equal to the Fair Market Value on such date of
    the shares which would otherwise have been delivered or become
    unrestricted; and the number of shares for which such cash payment is made
    shall be added back to the maximum number of shares available for use
    under the Plan, provided that the number of shares for which such cash
    payment is made may be made subject to Stock Incentives for Section 16
    Persons only if the General Counsel determines that doing so would not
    jeopardize any exemption from Section 16 of the Exchange Act (including
    without limitation SEC Rule 16b-3) for which the Company intends Section
    16 Persons to qualify.
 
(d) Stock Bonus Awards, Performance Unit Awards and Restricted Stock Awards
    shall be subject to such terms and conditions, including, without
    limitation, restrictions on the sale or other disposition of the shares
    issued or transferred pursuant to such Award, and conditions calling for
    forfeiture of the Award or the shares issued or transferred pursuant
    thereto in designated circumstances, as the Committee shall determine;
    provided however, that upon the issuance or transfer of shares to a
    Participant pursuant to any such Award, the recipient shall, with respect
    to such shares, be and become a shareholder of the Company fully entitled
    to receive dividends, to vote and to exercise all other rights of a
    shareholder except to the extent otherwise provided in the Award. All or
    any portion of a Stock Bonus Award may but need not be made in the form of
    a Performance Unit Award or a Restricted Stock Award.
 
(e) Each Stock Bonus Award, Performance Unit Award and Restricted Stock Award
    shall be evidenced by a written instrument in such form as the Committee
    shall determine, signed by an officer of the Company duly authorized to do
    so, provided that such instrument is consistent with this Plan and
    incorporates it by reference.
 
(f) Director Stock Awards shall be granted as determined by the Committee in
    accordance with the provisions of Section 7, and as otherwise provided by
    this Plan.
 
6. OPTIONS.
 
  Options shall be subject to the following provisions:
 
(a) Subject to the provisions of Section 9, the purchase price per share shall
    be, in the case of an Incentive Stock Option, not less than 100 percent of
    the Fair Market Value of a share of Common Stock on the date the Incentive
    Stock Option is granted (or in the case of any optionee who, at the time
    such Incentive Stock Option is granted, owns stock possessing more than 10
    percent of the total combined voting power of all classes of stock of his
    or her employer corporation or of its parent or subsidiary corporation,
    not less than 110 percent of the Fair Market Value of a share of Common
    Stock on the date the Incentive Stock Option is granted) and, in the case
    of a Non-Statutory Stock Option, not less than the par value (if any) of a
    share of Common Stock on the date the Non-Statutory Stock Option is
    granted. A Non-Statutory Stock Option
 
                                      A-5
<PAGE>
 
   may (but need not) entitle the Participant to purchase shares of Common
   Stock at any fixed discount specified by the Committee from Fair Market
   Value on the date of purchase. Subject to the foregoing limitations, the
   purchase price per share may, if the Committee so provides at the time of
   grant of an Option, be indexed to the increase or decrease in an index
   specified by the Committee.
 
(b) The purchase price of shares subject to an Option may be paid in whole or
    in part (i) in cash, (ii) by bank-certified, cashier's or personal check
    subject to collection, (iii) if so provided in the Option and subject to
    such terms and conditions as the Committee may impose, by delivering to
    the Company a properly executed exercise notice together with a copy of
    irrevocable instructions to a stockbroker to sell immediately some or all
    of the shares acquired by exercise of the Option and to deliver promptly
    to the Company an amount of sale proceeds (or, in lieu of or pending a
    sale, loan proceeds) sufficient to pay the purchase price, or (iv) if so
    provided in the Option and subject to such terms and conditions as are
    specified in the Option, in shares of Common Stock or other property
    surrendered to the Company. Property for purposes of this paragraph shall
    include an obligation of the Company unless prohibited by applicable law.
    Shares of Common Stock thus surrendered shall be valued at their Fair
    Market Value on the date of exercise. Any such other property thus
    surrendered shall be valued at its fair market value on any reasonable
    basis established or approved by the Committee. If so provided in the
    Option and subject to such terms and conditions as are specified in the
    Option, in lieu of the foregoing methods of payment, any portion of the
    purchase price of the shares to be issued or transferred may be paid by a
    promissory note secured by pledge of the purchased shares in such form and
    containing such provisions (which may but need not provide for interest
    and for payment of the note at the election of the Participant in cash or
    in shares of Common Stock or other property surrendered to the Company) as
    the Committee may approve; provided that (A) if the Committee permits any
    such note to be paid by surrender of shares of Common Stock, such shares
    shall be valued at their Fair Market Value on the date of such surrender,
    and (B) if the Committee permits any such note to be paid by surrender of
    other property, such other property shall be valued at its fair market
    value on any reasonable basis established or approved by the Committee,
    and (C) in the case of an Incentive Stock Option, any such note shall bear
    interest at the minimum rate required to avoid imputation of interest
    under federal income tax laws applicable at the time of exercise and (D)
    any such note shall mature in ten years or such lesser period as may be
    specified by the Committee.
 
(c) Options may be granted for such lawful consideration, including money or
    other property, tangible or intangible, or labor or services received or
    to be received by the Company, as the Committee may determine when the
    Option is granted. Property for purposes of the preceding sentence shall
    include an obligation of the Company unless prohibited by applicable law.
    Subject to the foregoing and the other provisions of this Section 6, each
    Option may be exercisable in full at the time of grant or may become
    exercisable in one or more installments, at such time or times and subject
    to satisfaction of such terms and conditions as the Committee may
    determine. The Committee may at any time accelerate the date on which an
    Option becomes exercisable, and no additional consideration need be
    received by the Company in exchange for such acceleration. Unless
    otherwise provided in the Option, an Option, to the extent it becomes
    exercisable, may be exercised at any time in whole or in part until the
    expiration or termination of the Option.
 
(d) Each Option shall be exercisable during the life of the optionee only by
    him or her or his or her guardian or legal representative, and after the
    death only by his or her Beneficiary or, absent a Beneficiary, by his or
    her estate or by a person who acquired the right to exercise the Option by
    will or the laws of decent and distribution; provided that an Option of a
    Section 16 Person and any Incentive Stock Option may be exercisable after
    death by a Beneficiary only if such exercise would be, in the opinion of
    the General Counsel, permissible under and consistent with SEC Rule 16b-3
    or Section 422 of the Code, as the case may be. Each Option shall expire
    at such time or times as the Committee may determine, provided that
    notwithstanding any other provision of this Plan, (i) no Option shall be
    exercisable after the tenth anniversary of the date the Option was
    granted, and (ii) no Incentive Stock Option which is granted to any
    optionee who, at the time such Option is granted, owns stock possessing
    more than 10 percent of the total combined voting power of all classes of
    stock of his or her employer corporation or of its parent or
 
                                      A-6
<PAGE>
 
   subsidiary corporation, shall be exercisable after the expiration of five
   (5) years from the date such Option is granted. If an Option is granted for
   a term of less than ten years, the Committee may, at any time prior to the
   expiration of the Option, extend its term for a period ending not later
   than on the tenth anniversary of the date the Option was granted, and no
   additional consideration need be received by the Company in exchange for
   such extension. The Committee may but need not provide for an Option to be
   exercisable after termination of employment until its fixed expiration date
   (or until an earlier date or specified event occurs).
 
(e) An Option may, but need not, be an Incentive Stock Option. All shares of
    Common Stock which may be made subject to Stock Incentives under this Plan
    may be made subject to Incentive Stock Options; provided that the
    aggregate Fair Market Value (determined as of the time the Option is
    granted) of the stock with respect to which Incentive Stock Options may be
    exercisable for the first time by any Key Employee during any calendar
    year (under all plans, including this Plan, of his or her employer
    corporation and its parent and subsidiary corporations) shall not exceed
    $100,000 or such other amount as may apply under the Code.
 
(f) Each Option shall be evidenced by a written instrument, signed by an
    officer of the Company duly authorized to do so, which shall contain such
    terms and conditions, and shall be in such form, as the Committee shall
    determine, provided the instrument is consistent with this Plan and
    incorporates it by reference. An Option, if so approved by the Committee,
    may include terms, conditions, restrictions and limitations in addition to
    those provided for in this Plan including, without limitation, terms and
    conditions providing for the transfer or issuance of shares, on exercise
    of an Option, which may be non-transferable and forfeitable to the Company
    in designated circumstances.
 
(g) The Committee may specify, at the time of grant of an Incentive Stock
    Option or, with respect to a Non-Statutory Stock Option, at or after the
    time of grant, that a Participant shall be granted a Non-Statutory Stock
    Option (a "Restored Option") if and when (i) such Participant exercise all
    or part of an Option, including a previously granted Restored Option, (an
    "Original Option") by surrendering shares of Common Stock already owned by
    him or her in full or partial payment of the Option price under such
    Original Option and/or (ii) shares of Common Stock are surrendered or
    withheld to satisfy tax obligations incident to the exercise of such
    Original Option. All Restored Options shall be subject to the availability
    of shares of Common Stock under the Plan at the time of such exercise. A
    Restored Option shall cover a number of shares of Common Stock not greater
    than the number of shares of Common Stock surrendered in payment of the
    option price under such Original Option and/or used to satisfy any tax
    obligation incident to the exercise of such Original Option. Each Restored
    Option shall have an option price equal to the Fair Market Value of the
    Common Stock on the date of grant of the Restored Option and shall expire
    on the stated expiration date of the Original Option. The date of grant of
    a Restored Option shall be the date on which the exercise of the Original
    Option or a previously granted Restored Option resulted in the grant of
    such Restored Option. A Restored Option shall be exercisable at any time
    and from time to time from or after the date of grant of the Restored
    Option (or as the Committee in its sole discretion shall otherwise specify
    in the written instrument evidencing the Restored Option). The written
    instrument evidencing a Restored Option shall contain such other terms and
    conditions, which may include a restriction on the transferability of the
    Common Stock received upon the exercise of the Original Option or Restored
    Option, as the Committee in its sole discretion may deem desirable.
 
(h) No Participant shall make any elective contribution or employee
    contribution to the Plan (within the meaning of Treasury Regulation
    Section 1.401(k)-1(d)(2)(iv)(B)(4) during the balance of the calendar year
    after the Participant's receipt of a hardship distribution from a plan of
    the Company or a related party within the provisions of Code Sections
    414(b), (c), (m) or (o) containing a cash or deferred arrangement under
    Section 401(k) of the Code, or during the following calendar year. The
    preceding sentence shall not apply if and to the extend that the General
    Counsel determines it is not necessary to qualify any such plan as a cash
    or deferred arrangement under Section 401(k) of the Code.
 
 
                                      A-7
<PAGE>
 
(i) No Option shall be exercisable unless and until the Company (i) obtains
    the approval of all regulatory bodies whose approval the General Counsel
    may deem necessary or desirable, and (ii) complies with all legal
    requirements deemed applicable by the General Counsel.
 
(j) An Option shall be considered exercised if and when written notice, signed
    by the person exercising the Option and stating the number of shares with
    respect to which the Option is being exercised, is received by the
    Secretary on a properly completed form approved for this purpose by the
    Committee, accompanied by full payment of the Option exercise price in one
    or more of the forms authorized by the Committee and described in Section
    6(b) above for the number of shares to be purchased. No Option may at any
    time be exercised with respect to a fractional share.
 
7. DIRECTOR STOCK AWARDS.
 
(a) Each Non-Employee Director Participant shall receive such portion of his
    Director Fees in Common Stock as shall be established from time to time by
    the Board, with the remainder of such Director Fees to be payable in cash
    or in Common Stock as elected by the Non-Employee Director Participant in
    accordance with paragraph 7(b), below.
 
(b) Each Non-Employee Director Participant shall have an opportunity to elect
    to have the remaining portion of his Director Fees paid in cash or shares
    of Common Stock or a combination thereof. Except for the initial election
    pursuant to the adoption of the Plan with this Section 7 therein, or the
    Director's election to the Board, any such election shall be made in
    writing and must be made at least thirty (30) days before the beginning of
    the Plan Year in which the services are to be rendered giving rise to such
    Director Fees and may not be changed thereafter except by timely written
    election as to Director Fees for services to be rendered in a subsequent
    Plan Year. In the absence of such an election, such remaining portion of
    the Director Fees of a Non-Employee Director shall be paid entirely in
    cash. Nothing contained in this paragraph 7(b) shall be interpreted in
    such a manner as would disqualify the Plan for treatment as a "formula
    plan" under Rule 16b-3 pursuant to which the terms and conditions of each
    transaction authorized by this Section 7 are fixed in advance by the
    relevant terms and provisions thereof.
 
(c) The number of shares of Common Stock to be paid and distributed to a Non-
    Employee Director under the provisions paragraphs 7(a) and (b), above,
    shall be determined by dividing the dollar amount of his Director Fees
    (which the Board has established, and/or such Non-Employee Director has
    elected) to be paid in Common Stock on any payment date by the Fair Market
    Value of a share of Common Stock on that date. Except as may otherwise be
    directed by the Committee, in its sole discretion, the payment and
    distribution of such shares to a Non- Employee Director shall be on or
    within five days after the date such Director Fees would otherwise have
    been paid to him in cash.
 
8. CERTAIN CHANGE IN CONTROL, TERMINATION OF EMPLOYMENT AND DISABILITY
PROVISIONS.
 
  Notwithstanding any provision of the Plan to the contrary, any Stock
Incentive which is outstanding but not yet exercisable, vested or payable at
the time of a Change in Control shall become exercisable, vested and payable
at that time; provided that if such Change in Control occurs less than six
months after the date on which such Stock Incentive was granted and if the
consideration for which such Stock Incentive was granted consisted in whole or
in part of future services, then such Stock Incentive shall become
exercisable, vested and payable at the time of such Change in Control only if
the Participant agrees in writing (if requested to do so by the Committee in
writing) to remain in the employ of the Company or a Subsidiary at least
through the date which is six months after the date such Stock Incentive was
granted with substantially the same title, duties, authority, reporting
relationships and compensation as on the day immediately preceding the Change
in Control. Any Option affected by the preceding sentence shall remain
exercisable until it expires or terminates pursuant to its terms and
conditions. Subject to the foregoing provisions of this Section 8, the
Committee may at any time, and subject to such terms and conditions as it may
impose:
 
 
                                      A-8
<PAGE>
 
(a) authorize the holder of an Option to exercise the Option following the
    termination of the Participant's employment with the Company and its
    Subsidiaries, or following the Participant disability, whether or not the
    Option would otherwise be exercisable following such event, provided that
    in no event may an Option be exercised after the expiration of its term;
 
(b) grant Options which become exercisable only in the event of a Change in
    Control;
 
(c) authorize a Stock Bonus Award, Performance Unit Award or Restricted Stock
    Award to become non-forfeitable, fully earned and payable upon or
    following (i) the termination of the Participant's employment with the
    Company and its Subsidiaries, or (ii) the Participant's disability,
    whether or not the Award would otherwise become non-forfeitable, fully
    earned and payable upon or following such event;
 
(d) grant Stock Bonus Awards, Performance Unit Awards and Restricted Stock
    Awards which become non-forfeitable, fully earned and payable only in the
    event of a Change in Control; and
 
(e) provide in advance or at the time of Change in Control for cash to be paid
    in settlement of any Option, Stock Bonus Award, Performance Unit Award or
    Restricted Stock Award in the event of a Change in Control, either at the
    election of the Participant or at the election of the Committee.
 
9. ADJUSTMENT PROVISIONS.
 
  In the event that any recapitalization, or reclassification, split-up or
consolidation of shares of Common Stock shall be effected, or the outstanding
shares of Common Stock shall be, in connection with a merger or consolidation
of the Company or a sale by the Company of all or a part of its assets,
exchanged for a different number or class of shares of stock or other
securities or property of the Company or any other entity or person, or a
record date for determination of holders of Common Stock entitled to receive a
dividend or other distribution payable in Common Stock or other property
(other than normal cash dividends) shall occur, (a) the number and class of
shares or other securities or property that may be issued or transferred
pursuant to Stock Incentives thereafter granted or that may be optioned or
awarded under the Plan to any Participant, (b) the number and class of shares
or other securities or property that may be issued or transferred under
outstanding Stock Incentives, (c) the purchase price to be paid per share
under outstanding and future Stock Incentives, and (d) the price to be paid
per share by the Company or a Subsidiary for shares or other securities or
property issued or transferred pursuant to Stock Incentives which are subject
to a right of the Company or a Subsidiary to reacquire such shares or other
securities or property, shall in each case be equitably adjusted; provided
that with respect to Incentive Stock Options any such adjustments shall comply
with Sections 422 and 424 of the Code.
 
10. EFFECTIVE DATE AND DURATION OF PLAN.
 
  The Plan shall be effective when it is first approved by the Board of
Directors, provided that the shareholders of the Company thereafter approve it
within one year of that date. If the Plan is not so approved by shareholders,
the Plan (and any Stock Incentive granted thereunder) shall be null, void and
of no force or effect. If so approved, the Plan shall remain in effect, and
Stock Incentives may be granted, until Stock Incentives have been granted with
respect to all shares authorized to be issued or transferred hereunder or
until the Plan is sooner terminated by the Board of Directors, and shall
continue in effect thereafter with respect to any Stock Incentives outstanding
at that time. In no event shall an Incentive Stock Option be granted under the
Plan more than ten (10) years from the date the Plan is first adopted by the
Board, or the date the Plan is approved by the shareholders of the Company,
whichever is earlier.
 
11. ADMINISTRATION.
 
(a) The Plan shall be administered by a committee of the Board consisting of
    two or more directors appointed from time to time by the Board. No person
    shall be appointed to or shall serve as a member of such committee unless
    at the time of such appointment and service he or she shall be a "Non-
    Employee
 
                                      A-9
<PAGE>
 
   Director," as defined in SEC Rule 16b-3. Unless the Board determines
   otherwise, the Committee shall be comprised solely of "outside directors"
   within the meaning of Section 162(m)(4)(C)(i) of the Code.
 
(b) The Committee may establish such rules and regulations, not inconsistent
    with the provisions of the Plan, as it may deem necessary for the proper
    administration of the Plan, and may amend or revoke any rule or regulation
    so established. The Committee shall, subject to the provisions of the
    Plan, have full power to interpret, administer and construe the Plan and
    any instruments issued under the Plan and full authority to make all
    determinations and decisions thereunder including without limitation the
    authority to (i) select the Participants in the Plan, (ii) determine when
    Stock Incentives shall be granted, (iii) determine the number of shares to
    be made subject to each Stock Incentive, (iv) determine the type of Stock
    Incentive to grant, and (v) determine the terms and conditions of each
    Stock Incentive, including the exercise price, in the case of an Option,
    and (vi) approve any transaction involving a Stock Incentive for a Section
    16 Person (other than a "Discretionary Transaction" as defined in SEC Rule
    16b-3) so as to exempt such transaction under SEC Rule 16b-3; provided,
    that any transaction under the Plan involving a Section 16 Person also may
    be approved by the Board of Directors, or may be approved or ratified by
    the stockholders of the Company, in the manner that exempts such
    transaction under SEC Rule 16b-3. The interpretation by the Committee of
    the terms and provisions of the Plan and any instrument issued thereunder,
    and its administration thereof, and all action taken by the Committee,
    shall be final, binding, and conclusive on the Company, its stockholders,
    Subsidiaries, all Participants and employees, and upon their respective
    Beneficiaries, successors and assigns, and upon all other persons claiming
    under or through any of them.
 
(c) Members of the Board of Directors and members of the Committee acting
    under this Plan shall be fully protected in relying in good faith upon the
    advice of counsel and shall incur no liability except for gross or willful
    misconduct in the performance of their duties.
 
12. GENERAL PROVISIONS.
 
(a) Any provision of the Plan to the contrary notwithstanding, any Stock
    Incentive issued under the Plan, including without limitation any Option,
    shall not be transferable by the Participant other than by will or the
    laws of descent and distribution or to a Beneficiary designated by the
    Participant, unless the instrument evidencing the Stock Incentive
    expressly so provides (or is amended to so provide) and is approved by the
    Committee; and any purported transfer of an Incentive Stock Option to a
    Beneficiary, shall be effective only if such transfer is, in the opinion
    of the General Counsel, permissible under and consistent with SEC Rule
    16b-3 or Section 422 of the Code, as the case may be. Notwithstanding the
    foregoing, a Participant may transfer any Stock Incentive granted under
    this Plan, other than an Incentive Stock Option, to members of his or her
    immediate family (defined as his or her children, grandchildren and
    spouse) or to one or more trusts for the benefit of such immediate family
    members or partnerships in which such immediate family members are the
    only partners if (and only if) the instrument evidencing such Stock
    Incentive expressly so provides (or is amended to so provide) and is
    approved by the Committee, and the Participant does not receive any
    consideration for the transfer; provided that any such transferred Stock
    Incentive shall continue to be subject to the same terms and conditions
    that were applicable to such Stock Incentive immediately prior to its
    transfer (except that such transferred Stock Incentive shall not be
    further transferable by the transferee inter vivos, except for transfer
    back to the original Participant holder of the Stock Incentive) and
    provided, further, that the foregoing provisions of this sentence shall
    apply to Section 16 Persons only if the General Counsel determines that
    doing so would not jeopardize any exemption from Section 16 of the
    Exchange Act (including without limitation SEC Rule 16b-3) for which the
    Company intends Section 16 Persons to qualify.
 
(b) Nothing in this Plan or in any instrument executed pursuant hereto shall
    confer upon any person any right to continue in the employment of the
    Company or a Subsidiary, or shall affect the right of the Company or a
    Subsidiary to terminate the employment of any person at any time with or
    without cause.
 
 
                                     A-10
<PAGE>
 
(c) No shares of Common Stock shall be issued or transferred pursuant to a
    Stock Incentive unless and until all legal requirements applicable to the
    issuance or transfer of such shares have, in the opinion of the General
    Counsel, been satisfied. Any such issuance or transfer shall be contingent
    upon the person acquiring the shares giving the Company any assurances the
    General Counsel may deem necessary or desirable to assure compliance with
    all applicable legal requirements.
 
(d) No person (individually or as a member of a group) and no Beneficiary or
    other person claiming under or through him, shall have any right, title or
    interest in or to any shares of Common Stock (i) issued or transferred to,
    or acquired by, a trust, (ii) allocated, or (iii) reserved for the
    purposes of this Plan, or subject to any Stock Incentive except as to such
    shares of Common Stock, if any, as shall have been issued or transferred
    to him. The Committee may (but need not) provide at any time or from time
    to time (including without limitation upon or in contemplation of a Change
    in Control) for a number of shares of Common Stock, equal to the number of
    such shares subject to Stock Incentives then outstanding, to be issued or
    transferred to, or acquired by, a trust (including but not limited to a
    grantor trust) for the purpose of satisfying the Company's obligations
    under such Stock Incentives, and, unless prohibited by applicable law,
    such shares held in trust shall be considered authorized and issued shares
    with full dividend and voting rights, notwithstanding that the Stock
    Incentives to which such shares relate shall not have been exercised or
    may not be exercisable or vested at that time.
 
(e) The Company and its Subsidiaries may make such provisions as they may deem
    appropriate for the withholding of any taxes which they determine they are
    required to withhold in connection with any Stock Incentive. Without
    limiting the foregoing, the Committee may, subject to such terms and
    conditions as it may impose, permit or require any withholding tax
    obligation arising in connection with the grant, exercise, vesting,
    distribution or payment of any Stock Incentive to be satisfied in whole or
    in part, with or without the consent of the Participant, by having the
    Company withhold all or any part of the shares of Common Stock that vest
    or would otherwise be distributed at such time. Any shares so withheld
    shall be valued at their Fair Market Value on the date of such
    withholding.
 
(f) Nothing in this Plan is intended to be a substitute for, or shall preclude
    or limit the establishment or continuation of, any other plan, practice or
    arrangement for the payment of compensation or fringe benefits to
    directors, officers or employees generally, or to any class or group of
    such persons, which the Company or any Subsidiary now has or may hereafter
    lawfully put into effect, including, without limitation, any incentive
    compensation, retirement, pension, group insurance, stock purchase, stock
    bonus or stock option plan.
 
(g) Any provision of the Plan to the contrary notwithstanding, except to the
    extent that the Committee determines otherwise, (i) transactions by and
    with respect to Section 16 Persons under the Plan are intended to qualify
    for any applicable exemptions provided by SEC Rule 16b-3, and (ii)
    transactions with respect to persons whose remuneration would not be
    deductible by the Company but for compliance with the provisions of Code
    Section 162(m)(4)(C) are intended to comply with the provisions of Code
    Section 162(m)(4)(C). The Plan is also intended to give the Committee the
    authority to award Stock Incentives that qualify as performance-based
    compensation under Code Section 162(m)(4)(C) as well as Stock Incentives
    that do not so qualify. Every provision of the Plan shall be administered,
    interpreted and constructed to carry out the foregoing intentions and any
    provision that cannot be so administered, interpreted and construed shall
    to that extent be disregarded.
 
(h) By accepting any benefits under the Plan, each Participant, and each
    person claiming under or through him, shall be conclusively deemed to have
    indicated his or her acceptance and ratification of, and consent to, all
    provisions of the Plan and any action or decision under the Plan by the
    Company, its agents and employees, and the Board of Directors and the
    Committee.
 
(i) The validity, construction, interpretation and administration of the Plan
    and of any determinations or decisions made thereunder, and the rights of
    all persons having or claiming to have any interest therein or
 
                                     A-11
<PAGE>
 
   thereunder, shall be governed by, and determined exclusively in accordance
   with, the laws of the State of Delaware, but without giving effect to the
   principles of conflicts of laws thereof. Without limiting the generality of
   the foregoing, the period within which any action arising under or in
   connection with the Plan must be commenced, shall be governed by the laws
   of the State of Delaware, without giving effect to the principles of
   conflicts of laws thereof, irrespective of the place where the act or
   omission complained of took place and of the residence of any party to such
   action and irrespective of the place where the action may be brought.
 
(j) The use of the masculine gender shall also include within its meaning the
    feminine. The use of the singular shall include within its meaning the
    plural and vice versa.
 
13. AMENDMENT AND TERMINATION.
 
  The Plan may be amended by the Board of Directors, without shareholder
approval, at any time and in any respect, unless shareholder approval of the
amendment in question is required under Oklahoma law, the Code (including
without limitation Code Section 422 and Proposed Treasury Regulation Section
1.422A9(b)(iv) thereunder), any applicable exemption from Section 16 of the
Exchange Act (including without limitation SEC Rule 16b-3) for which the
Company intends Section 16 Persons to qualify, any national securities
exchange or system on which the Stock is then listed or reported, by any
regulatory body having jurisdiction with respect to the Plan, or under any
other applicable laws, rules or regulations. The Plan may also be terminated
at any time by the Board of Directors. No amendment or termination of this
Plan shall adversely affect any Stock Incentive granted prior to the date of
such amendment or termination without written consent of the Participant.
 
                                     A-12
<PAGE>
 
                                                           100 West Fifth Street
                                                                 Tulsa, OK 74103



                                  ONEOK, INC.

                                     1998

                             ANNUAL REPORT TO THE

                      SECURITIES AND EXCHANGE COMMISSION
<PAGE>
 
                                                                       FORM 10-K
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                   FORM 10-K

(Mark One)
X  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
- -- 
EXCHANGE ACT OF 1934 for the fiscal year  ended August 31, 1998.
                                      OR
   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
- -- 
EXCHANGE ACT OF 1934 for the transition period from ______ to ______ 

                       Commission file number 001-13643

                                  ONEOK, INC.
            (Exact name of registrant as specified in its charter)

OKLAHOMA                                                73-1520922
(State or other jurisdiction of                         (I.R.S. Employer
incorporation of organization)                          Identification No.)

100 WEST FIFTH STREET, TULSA, OK                        74103
(Address of principal executive offices)                (Zip Code)

Registrant's telephone number, including area code (918) 588-7000


                  (Former name if changes since last report.)

Securities registered pursuant to Section 12(b) of the Act:

TITLE OF EACH CLASS                    NAME OF EACH EXCHANGE ON WHICH REGISTERED
- -------------------                    -----------------------------------------
Common stock, with par value of $0.01  New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

TITLE OF EACH CLASS
- -------------------
Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports) and (2) has been subject to such filing
requirements for the past 90 days.  Yes  X   No 
                                        ---     ---

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Registration S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. X
           -

Aggregate market value of registrant's voting stock held by nonaffiliates as of
August 31, 1998, was:
Common stock of $949.3 million.

On August 31, 1998, the Company had 31,576,287 shares of common stock
outstanding.

                      DOCUMENTS INCORPORATED BY REFERENCE:

DOCUMENTS                                               PART OF FORM 10-K
<PAGE>
 
Definitive Proxy Statement related to 1999 annual meeting.        Part III


                                  ONEOK, INC.
                        1998 ANNUAL REPORT ON FORM 10-K
 
 
PART I                                                                  PAGE NO.
 
Item 1.     Business                                                    1 - 11
Item 2.     Properties                                                  12 - 14
Item 3.     Legal Proceedings                                           15 - 16
Item 4.     Results of Votes of Security Holders                        17
 
 
PART II
 
Item 5.     Market Price and Dividends on the Registrant's
            Common Stock and Related Shareholder Matters                18
Item 6.     Selected Financial Data                                     18
Item 7.     Management's Discussion and Analysis of  Financial
            Condition and Results of Operations                         19 - 31
Item 7A.    Quantitative and Qualitative Disclosures
            About Market Risk                                           31 - 32
Item 8.     Financial Statements and Supplementary Data                 33 - 56
Item 9.     Changes in and Disagreements with Accountants
            On Accounting and Financial Disclosures                     57
 
 
PART III
 
Item 10.    Directors, Executive Officers, Promoters, and
            Control Persons of the Registrant                           57
Item 11.    Executive Compensation                                      57
Item 12.    Security Ownership of Certain Beneficial Owners
            and Management                                              57
Item 13.    Certain Relationships and Related Transactions              57
 
PART IV.
 
Item 14.    Exhibits, Financial Statement Schedules, and Reports 
            on Form 8-K                                                 58 - 60

                                       2
<PAGE>
 
                                    PART I.

ITEM 1.   BUSINESS

GENERAL - ONEOK, Inc. (formerly WAI, Inc.), an Oklahoma corporation, was
organized on May 16, 1997. On November 26, 1997, it acquired the gas business of
Western Resources, Inc. (Western) (see Acquisitions and Mergers below) and
merged with ONEOK Inc., a Delaware corporation organized in 1933. It was a
successor to a company founded in 1906 as Oklahoma Natural Gas Company.

ONEOK, Inc. and subsidiaries (collectively, the Company) engage in several
aspects of the energy business providing environmentally clean fuels and
products. The Company purchases, gathers, compresses, transports, and stores
natural gas for distribution to consumers. It also transports gas and leases
pipeline capacity to others. The Company drills for and produces oil and gas,
extracts and sells natural gas liquids, and is engaged in the gas marketing
business. In addition, it leases and operates a headquarters office building
(leasing excess space to others) and owns and operates a related parking
facility. As a regulated natural gas utility, the Company distributes natural
gas to approximately 1.4 million customers in the states of Oklahoma and Kansas.
The Company's business units are characterized as operating within either a rate
regulated environment (regulated operations) or a nonregulated environment
(nonregulated operations).

The regulated business unit provides natural gas distribution, transportation,
gas supply, and storage services in Oklahoma and Kansas. The Company's
operations in Oklahoma are conducted through Oklahoma Natural Gas Company
Division, ONEOK Gas Transportation Company Division and three wholly-owned
subsidiaries, ONEOK Gas Transportation, L.L.C., ONG Transmission Company, and
ONG Sayre Storage Company, which together form an integrated intrastate natural
gas distribution and transmission business which serves residential, commercial,
and industrial customers in about 75 percent of the state of Oklahoma,. These
companies will be collectively referred to herein as ONG. The Company's
operations in Kansas are conducted through Kansas Gas Service Company Division
(Kansas Gas Service) and Mid Continent Market Center (MCMC), a wholly-owned
transportation company. These companies will be collectively referred to herein
as KGS. KGS's regulated gas operations are primarily engaged in distribution and
intrastate gas transportation, as well as gas wheeling, parking, balancing and
storage services. Kansas Gas Service serves residential, commercial, and
industrial customers in about 67 percent of Kansas. Kansas Gas Service also
conducts regulated gas distribution operations in northeastern Oklahoma.

The Oklahoma Corporation Commission recently promulgated rules to restructure
Oklahoma's natural gas utility industry which require gas utility companies to
"unbundle" their natural gas utility services in the State of Oklahoma. In
compliance with such rules, the Company filed an application to unbundle its
services upstream of the city gates of its distribution systems. On July 31,
1998, the Commission issued an interim Order separating ONG's utility services
into distribution, transportation, gas supply, storage, and gathering services.
The Order directed that services upstream of the city gate for distribution
systems (i.e., transportation, gas supply, storage and gathering services) be
obtained through a competitive bid process. The interim Order also established
the cost of service to be allocated to the various upstream services.

The nonregulated business unit includes the following core business segments:
natural gas marketing activities conducted primarily by ONEOK Gas Marketing
Company; gas processing and gas gathering activities conducted primarily by
ONEOK Gas Processing, L.L.C., and ONEOK Producer Services, L.L.C.; and
production activities conducted by ONEOK Resources Company. Other businesses
include ONEOK Leasing Company who leases and operates a headquarters building,
and ONEOK Parking Company, who owns and operates a parking garage. ONEOK Power
Marketing Company has been formed for the purpose of the wholesale marketing of
electricity but has not yet begun operations.

                                       3
<PAGE>
 
This Form 10-K (and certain other documents that are incorporated by reference
in this 10-K) contains statements concerning Company expectations or predictions
of the future that are "forward-looking statements" within the meaning of the
Private Securities Litigation Reform Act of 1995. These statements are intended
to be covered by the safe harbor provision of the Securities Act of 1933 and the
Securities Exchange Act of 1934. Forward-looking statements are based on
management's beliefs and assumptions based on information currently available.
It is important to note that actual results of Company earnings could differ
materially from those projected in such forward-looking statements. Factors that
may impact forward-looking statements include, but are not limited to, the
following: (I) the effects of weather and other natural phenomena; (ii)
increased competition from other energy suppliers as well as alternative forms
of energy; (iii) the capital intensive nature of the Company's business; (iv)
economic climate and growth in the geographic areas in which the Company does
business; (v) the uncertainty of gas and oil reserve estimates; (vi) the timing
and extent of changes in commodity prices for natural gas, electricity, and
crude oil; (vii) the nature and projected profitability of potential projects
and other investments available to the Company; (viii) conditions of capital
markets and equity markets; (ix) Year 2000 issues, and (x) the effects of
changes in governmental policies and regulatory actions, including income taxes,
environmental compliance and authorized rates. Accordingly, while the Company
believes these forward-looking statements to be reasonable, there can be no
assurance that they will approximate actual experience or that the expectations
derived from them will be realized. When used in Company documents, the words
"anticipate," "expect," "projection," "goal" or similar words are intended to
identify forward-looking statements. The Company does not have any intention or
obligation to update forward-looking statements after they distribute this 10-K
even if new information, future events or other circumstances have made them
incorrect or misleading.

ACQUISITIONS AND MERGERS - The following summarizes material acquisitions and
mergers completed in the current fiscal year; no material acquisitions took
place in the prior four years. On November 26, 1997, the Company acquired from
Western all of the assets of Western that were primarily used in, or primarily
related to or primarily generated by the field operations of the local natural
gas distribution business of Western, and all of the outstanding capital stock
of Western's directly or indirectly wholly-owned subsidiaries, Westar Gas
Marketing, Inc. and MCMC, and assumed (i) all of the liabilities of Western that
arose primarily out of or related primarily to or were primarily generated by
such gas business and (ii) approximately $161 million in aggregate principal
amount of debt of Western; and the Company merged (the "Merger") into ONEOK,
Inc., a Delaware corporation, with the Company as the surviving corporation. The
shares of ONEOK, Inc. common stock were converted on a one-for-one basis into
shares of stock of the Company, and Western received 2,996,702 shares of the
Company's Common Stock and 19,317,584 shares of the Company's Series A
Convertible Preferred Stock. Such shares and additional shares purchased by
Western at the Closing of the transaction represented in the aggregate 9.9
percent of the Common Stock and 45 percent of the Capital Stock of the Company.
A shareholder agreement, which includes standstill provisions, prevents Western
from increasing its position in the Company above a capital stock interest of 45
percent and maintains control of the Company in the hands of the public
shareholders of the Company. The transaction resulted in the acquisition of
660,000 new distribution customers, 10,068 miles of pipeline, two Kansas gas
processing plants with a 200 million cubic feet per day capacity, and a natural
gas marketing company with a retail market focus to the Company.

The acquisition was accounted for as a purchase and, accordingly, the operating
results of the properties acquired from Western are included in the consolidated
financial statements since December 1, 1997. The aggregate purchase price was
approximately $824 million, including debt assumed and transaction costs. The
aggregate purchase price, which was funded through the issuance of a combination
of preferred and common stock, was allocated based on the estimated fair value
of the net assets. The excess of the purchase price over the fair value of the
net assets acquired approximated $74 million and is being amortized over 40
years.

From time to time, the Company has acquired and sold gas processing plant
properties, gathering and transportation facilities and other operating assets
in an effort to enhance overall operational efficiency, none of these
transactions have been material to the Company's financial position.

The Company's strategy is to acquire additional gas distribution and
transmission facilities, gas producing properties, or other assets which will
further enhance its existing operations and will continue to pursue such
opportunities in the future.

ENVIRONMENTAL MATTERS - In connection with the Western transaction, the Company
acquired 12 manufactured gas sites 

                                       4
<PAGE>
 
located in Kansas which may contain coal tar and other potentially harmful
materials that are classified as hazardous material. Hazardous materials are
subject to control or remediation under various environmental laws and
regulations. A consent agreement with the Kansas Department of Health and
Environment (KDHE) presently governs all future work at these sites. The terms
of the consent agreement allow the Company to investigate these sites and set
remediation priorities based upon the results of the investigations and risk
analysis. The prioritized sites will be investigated over a ten year period. At
August 31, 1998, the costs of the investigations and risk analysis have been
minimal. Limited information is available about the sites and no testing has
been performed. Management's best estimate of the cost of remediation ranges
from $100 thousand to $10 million per site based on a limited comparison of
costs incurred to remediate comparable sites. These estimates do not give effect
to potential insurance recoveries, recoveries through rates or from third
parties. The KCC has permitted others to recover their remediation costs through
rates. It should be noted that additional information and testing could result
in costs significantly below or in excess of the amounts estimated above. To the
extent that such remediation costs are not recovered, the costs could be
material to the Company's results of operations and cash flows depending on the
degree of remediation required and number of years over which the remediation
must be completed.

The Company's expenditures for environmental evaluation and remediation have not
been significant in relation to the results of operations of the Company.
Capital expenditures for environmental issues during the 1998 fiscal year
totaled $666,000.  There have been no material effects upon earnings or the
Company's competitive position during the 1998 fiscal year related to compliance
with these regulations.

EMPLOYEES - The Company employed 3,211 persons at August 31, 1998.  Nine
hundred-forty employees of KGS are subject to collective bargaining contracts.
The Company did not experience any strikes or work stoppages during 1998. The
Company's current contracts with the Unions are as follows:

UNION                                                EMPLOYEES  CONTRACT EXPIRES
- --------------------------------------------------------------------------------
United Steelworkers of America                             533    June 6, 2002
- --------------------------------------------------------------------------------
International Union of Operating Engineers                  20    June 6, 2002
- --------------------------------------------------------------------------------
Gas Workers Metal Trades of the United
Association of Journeymen and Apprentices of the
Plumbing and Pipefitting Industry of the United
States and Canada                                           13    June 6, 2002
- --------------------------------------------------------------------------------
International Brotherhood of Electrical Workers            374    June 30, 1999
- --------------------------------------------------------------------------------

FINANCIAL AND STATISTICAL INFORMATION - For financial and statistical
information regarding the Company's business units by segment, see "Management's
Discussion and Analysis of Financial Condition and Related Operations" and Note
K of Notes to Consolidated Financial Statements.

DESCRIPTION OF BUSINESS SEGMENTS

(A)  REGULATED OPERATIONS

GENERAL

The Oklahoma operations comprise a fully integrated intrastate natural gas
gathering, storage, distribution and transportation business, which purchases,
stores, transports, and distributes natural gas for sale to wholesale and retail
customers located primarily in the state of Oklahoma.  It also leases pipeline
capacity under its Pipeline Capacity Lease (PCL) program to large volume
commercial and industrial customers for their use in transporting natural gas to
their facilities.  It transports gas for others under Section 311(a) of the
Natural Gas Policy Act (NGPA) of 1978.   The operations are consolidated for
ratemaking purposes by the Oklahoma Corporation Commission (OCC).

ONG purchases natural gas from gas processing plants, producing gas wells, and
pipeline suppliers, and utilizes five underground storage facilities as
necessary to deliver natural gas to approximately 750,000 customers at August
31, 1998, located in 295 communities in Oklahoma.  ONG's largest markets are the
Oklahoma City and Tulsa metropolitan areas.  ONG also sells natural gas and/or
leases pipeline capacity to other local gas distributors serving 46 Oklahoma

                                       5
<PAGE>
 
communities.  ONG serves an estimated population of over 2 million.

Five underground storage facilities are owned and capacity is leased to third
parties on a short-term basis.  The Sayre gas storage facility is leased, on a
long-term basis, to and operated by the Natural Gas Pipeline Company of America.
Sayre retains capacity for its use.

Kansas Gas Service supplies natural gas at retail to 362 communities in Kansas
and Oklahoma with approximately 96 percent of those gas deliveries to Kansas
customers.  It also makes wholesale delivery to eight communities and two
utilities. The distribution system purchases natural gas from various suppliers
that is transported by intrastate and interstate pipeline companies.  MCMC
provides Kansas Gas Service and others with natural gas transportation,
wheeling, parking, balancing, and storage services.   Under a long term
arrangement, Kansas Gas Service provides and manages the field operations and
various administrative and general needs of MCMC.  MCMC also transports gas for
its large commercial and industrial customers which purchase gas on the spot
market.  KGS's largest markets served include Johnson County, Wichita, and
Topeka, Kansas, and Bartlesville, Oklahoma.  Kansas Gas Service and MCMC are not
consolidated for ratemaking purposes by the Kansas Corporation Commission (KCC).

MCMC stores gas in two company-owned underground storage facilities, and
additional leased facilities, for delivery to customers during periods of higher
demand.  A $10 million expansion project, to be completed in 2000, is expected
to increase the storage capacity from 4.6 to 6.3 Bcf.

Of the Company's consolidated revenues, revenues from regulated operations
represent approximately 53.0, 51.5, and 44.0 percent for 1998, 1997, and 1996,
respectively.  Income before interest and income taxes from the regulated
operations is 73.4, 78.0, and 80.4 percent of the consolidated income before
interest and income taxes for 1998, 1997, and 1996, respectively.

GAS SUPPLY

Gas supplies available to ONG for purchase and resale include supplies of gas
under both short and long-term contracts with independent producers, as well as
pipeline companies, gas processors, and other suppliers that own or control
reserves.  Oklahoma is the third largest gas producing state in the nation; and
ONG, unlike most utilities, has direct access through its transportation system
to all of the major gas producing areas in the state.  The system, which
intersects with 10 interstate pipelines at 26 interconnect points, 38 gas
processing plants, and 128 producing fields located in Oklahoma, allows natural
gas to be moved to locations throughout the state and nation.  In addition, four
of the storage facilities operated by ONG are located in close proximity to its
large market areas.  These four storages have a combined average capacity of 119
billion cubic feet to help assure deliverability to customers even on winter
peak usage days. On such days, withdrawal from storage can provide as much as 50
percent of the system's needs.  The record for all-time peak gas deliveries
through the system in a single day was 1.92 billion cubic feet.

The ONG rate schedule's "Order of Curtailment" and the KGS rate order's
"Priority of Service"  provides for first reducing or totally discontinuing gas
service to the very large industrial users and graduating down to requesting
residential and commercial customers to reduce their gas requirements to an
amount essential for public health and safety.

KGS has transportation agreements for delivery of gas which have terms varying
in length from one to twenty years with the following non-affiliated pipeline
transmission companies: Williams Natural Gas Company ("WNG"), Kansas Pipeline
Partnership, Panhandle Eastern Pipeline Company, and various other intrastate
and interstate pipelines. Gas transported under these agreements represents
approximately 80 percent of the total distribution system throughput.

In October 1994, KGS executed a long-term gas purchase contract ("Base
Contract") and a peaking supply contract with Amoco Production Company ("Amoco")
for the purpose of meeting the requirements of the customers served over the WNG
pipeline system. KGS anticipates that the Base Contract will supply between 50
percent and 65 percent of KGS' demand served by the WNG pipeline system. Amoco
is one of various suppliers over the WNG pipeline system and if this contract
were canceled, management believes gas supplied by Amoco could be replaced with
gas from other suppliers. Gas available under the Base Contract is also
available for sale by KGS to other parties and sales are recorded as opportunity
gas sales.

                                       6
<PAGE>
 
The remaining 20 percent of Kansas Gas Service's total distribution throughput
is transported entirely through MCMC. The related natural gas is purchased from
a combination of direct wellhead production, from the outlet of natural gas
processing plants, and from natural gas marketers and production companies.

Kansas Gas Service retains a priority right to capacity on MCMC necessary to
serve its customers.  KGS has the opportunity to negotiate for the purchase of
natural gas with producers or marketers utilizing MCMC services, which increases
the potential supply.

To meet seasonal heating demands for residential and commercial customers, KGS
owns and operates and has under contract  underground gas storage facilities.
Inventories of stored gas are typically near maximum level immediately prior to
the winter months and reduced as needed to meet system requirements.

The Company has a surplus of natural gas available to its utility systems and
does not anticipate problems with securing additional gas supply as needed for
its customers.

CUSTOMERS

RESIDENTIAL AND COMMERCIAL - ONG and KGS distribute natural gas as public
utilities to approximately 80 percent of Oklahoma and 67 percent of Kansas.
Natural gas sales to residential and commercial customers, which are used
primarily for heating and cooking, account for approximately 60 and 26 percent
of gas sales, respectively in Oklahoma and 73 and 26 percent of gas sales in
Kansas, respectively.  Gas sales to residential and commercial customers are
seasonal, as a substantial portion of such sales are used principally for space
heating.  Accordingly, the volume of gas sales is consistently higher during the
heating season (November through May) than in other months of the year.  Rates
for natural gas distribution operations include a temperature normalization
adjustment clause during the heating season for ONG customers.

A franchise is a right to use the municipal streets, alleys, and other public
ways for utility facilities for a defined period of time for a fee.  Although
the laws of the states of Oklahoma and Kansas prohibit exclusive utility
franchises, management nevertheless believes there are advantages to having
franchises in the larger municipalities in which operations are conducted.   ONG
has franchises or gross receipts agreements in 234 municipalities while  KGS
holds franchises in 295 municipalities.  In management's opinion, its franchises
contain no unduly burdensome restrictions and are sufficient for the transaction
of business in the manner in which it is now conducted.

INDUSTRIAL - A substantial portion of the ONG system throughput is transported
for industrial customers. Under the Company's PCL program, the customer, for a
fee, can have its gas, whether purchased from ONG or a third-party supplier,
transported to its facilities utilizing lines owned by ONG. PCL services are at
negotiated rates which are generally below the approved PCL tariff rates, and
competition continues to drive the rates lower. Industrial sales, rentals for
PCL's, and other energy-related operations tend to remain relatively constant
throughout the year, while interstate transportation volumes fluctuate based on
market demand. During the 1997 year, the Company was the successful bidder to
transport gas to four natural gas-fired electric generating plants owned by
Public Service Company of Oklahoma. No single customer accounted for more than
ten percent of consolidated operating revenues.

KGS industrial sales account for less than one percent of natural gas delivered.
KGS transports gas for its large industrial customers through it's End-Use
Customer Transportation (ECT) program. This program allows industrial customers
to purchase gas on the spot market and have it transported by KGS. KGS earned
approximately the same margin on the volume of gas transported as on volumes
sold except where discounting occurred in order to retain the customer's load.
No single customer accounted for more than ten percent of consolidated operating
revenues.

The potential impact of the loss of a significant portion of this volume is
discussed at Management's Discussion and Analysis of Financial Conditions and
Results of Operations, Liquidity, on page 30.

COMPETITION

The natural gas industry is expected to remain highly competitive.  Management
believes that it must maintain a competitive advantage in order to retain its
customers and, accordingly, continues to focus on reducing costs and 

                                       7
<PAGE>
 
pursuing unbundling opportunities.

The Company is subject to competition from electric utilities offering
electricity as a rival energy source and competing for the space heating, water
heating, and cooking markets.  The principal means to compete against
alternative fuels is lower prices, and natural gas continues to maintain its
price advantage in the residential, commercial, and both small and large
industrial markets.  In residential markets, the average cost of gas is less for
ONG customers and for KGS customers than the average cost of gas nationwide and
considerably less than the cost of an equivalent amount of electricity.

The Company is subject to competition from other pipelines for its existing
industrial load.  The PCL program and Special Industrial Sales Program (SISP)
offered by ONG are a response to such competitive pressure.  The PCL rate allows
ONG to effectively compete in these markets and maintain throughput and
therefore, load factors which benefit all customer classes.  KGS, through the
ECT program, is able to compete with other pipelines and continue to serve its
large commercial and industrial customers.  Competition, however, continues to
compress rates.

In April 1992, the Federal Energy Regulatory Commission (FERC) approved Order
636.  Less than one percent of ONG's gas supply is transported on interstate
pipelines; 80 percent of KGS' gas supply is transported on interstate pipelines.

Increasing competition in the natural gas industry, along with the efforts of
the regulatory commissions, have been driving forces behind the Company's plans
to unbundle its services.

GOVERNMENT REGULATIONS

Rates charged for gas services, including distribution, transportation, and
storage, are established by the OCC for Oklahoma Natural Gas and by the KCC and
OCC for Kansas Gas Service.  Changes in the gas purchase costs are included in
the purchased gas adjustment clause.  Other costs must be recovered through
periodic rate adjustments approved by the OCC and KCC.

The KCC has approved a pilot program KGS designed to moderate the cost its
customers pay for natural gas in cold weather months.  Under this program, which
begins this heating season, the Company will use commodity derivative
instruments to cap the price of its anticipated winter heating season gas
purchases in order to protect customers from the upward volatility during the
winter heating months.

In August 1998, the KCC  approved a pilot program in Kansas that will offer
residential customers the option of paying a fixed monthly bill.  The program
will allow a qualified residential customer the option of paying a fixed monthly
amount based on the projected average annual usage rather than actual usage.  A
similar program is in effect for customers in Oklahoma.

The OCC issued an interim order on July 31, 1998, for ONG to proceed with a
competitive bidding process to obtain some of the upstream services, such as
supply, transportation, and storage, necessary to serve the Oklahoma City and
Tulsa markets.  The order outlines how ONG is to proceed with upstream
unbundling.  While the Company supports the concept of unbundling, it believes
the order contains elements that are an "invasion of internal management
discretion" and has filed an appeal with the Oklahoma Supreme Court.  The
ultimate outcome of these proceedings and their impact, if any, on future
earnings and cash flow can not be predicted at this time.  See Item 3, Legal
Proceedings.

In a first step toward unbundling in Kansas, KGS filed a proposed tariff change
with the KCC, reducing the minimum requirement for transportation service to
3,000 Mcf annually and requested approval of a revenue-neutral residential basic
service charge and upstream capacity charge.  Approval of this filing by the KCC
will allow KGS to expand transportation services to an additional 650 commercial
and industrial customers and to restructure residential customer bills to better
reflect the differences between the basic service charge for delivery and the
cost of natural gas.

A temperature adjustment clause, in effect for ONG customers since 1995,
reduces the effect of extremes in weather 

                                       8
<PAGE>
 
for both the Company and the customer. In connection with the Western alliance,
ONG filed a stipulation which included an agreement not to file for a general
rate increase for a period of one year. KGS filed a stipulation which included
an agreement not to file a general rate increase for three years.

The Company has settled all known claims arising out of long-term gas supply
contracts containing "take-or-pay" provisions which purport to require the
Company to pay for volumes of natural gas contracted for but not taken.  The OCC
has authorized recovery of the accumulated settlement costs over a 20 year
period or approximately $6.7 million annually through a combination of a
surcharge from customers and revenue from transportation under Section 311(a) of
the NGPA and other intrastate transportation revenues.  There are no significant
potential claims or cases pending against the Company under remaining gas
purchase contracts.

OTHER REGULATED BUSINESSES

OkTex Pipeline Company transports gas in interstate commerce under Section
311(a) of the NGPA and is treated as a separate entity by FERC.  The Company has
the capacity to move up to 200 million cubic feet per day into the Lone Star Gas
Company's system in Texas and the Red River Pipeline.  OkTex has complied with
the requirements of Order 636.

(B)  NONREGULATED OPERATIONS

MARKETING

GENERAL - The Company purchases and markets natural gas, primarily in the mid-
continent area of the United States. The alliance with Western has expanded the
Company's operations to include  retail customers.  Due to expanded supply and
storage capabilities, the marketing operation has evolved from an intrastate
aggregator into an interstate aggregator.  Of the Company's consolidated
revenues, revenues from the gas marketing operations represent approximately
40.7, 39.6, and 48.9 percent for 1998, 1997, and 1996, respectively.  Income
before interest and income taxes from the marketing operation is 6.1, 6.1, and
10.7 percent of the consolidated income before interest and income taxes for
1998, 1997, and 1996, respectively.

MARKET CONDITIONS - The baseload marketing business is very competitive and, as
the industry matures, continues to go through a period of consolidation and
reduced margins.  The Company's strategy is to concentrate its efforts on
capitalizing on day-to-day pricing volatility through the use of gas storage
facilities, hedging, and transportation arbitraging.  Management believes that
its location in Oklahoma, its expansion into the Kansas market,  as well as the
benefits derived from vertically integrating the gas marketing operations with
the Company's production, gathering, processing, storage, and transportation
businesses, will provide the strategic advantage necessary to compete.

NEW PRODUCTS AND SERVICES - In 1997, the marketing operation was the successful
bidder to provide firm and interruptible gas service to four natural gas-fired
electric generating plants owned by Public Service Company of Oklahoma.

The Company has received approval from FERC to market electricity.  It is not
anticipated that these activities will be a major contributor to earnings in
fiscal 1999.

PRICE RISK MANAGEMENT - In order to mitigate the financial risks arising from
fluctuations in both the market price and transportation costs of natural gas,
the Company routinely enters into natural gas futures, swaps, and options as a
method of protecting its margins on the underlying physical transactions.
However, net open positions in terms of price, volume, and specified delivery
point do occur.

GATHERING AND PROCESSING

GENERAL - The Company owns and operates one gas processing plant and has
nonoperating interests in three gas processing plants. The gas processing
operations include the extraction of natural gas liquids (NGL's) and the
separation 

                                       9
<PAGE>
 
("fractionation") of mixed NGLs into component products (e.g., ethane/propane
mix, propane, iso and normal butane, and natural gasoline). The component
products are used for petrochemical feedstock, residential heating and cooking
in rural areas, and blending into motor fuels. The industry as a whole operates
substantial numbers of such plants, many owned by large integrated oil and gas
companies and independents. NGL margins have been highly volatile over the past
several years as profitability is dependent on the relationship between natural
gas costs and NGL prices. Management believes that the industry is becoming much
more competitive as demand increases for NGLs, especially petrochemical
feedstock.

Extraction is the process of removing NGLs from the inlet raw gas stream,
thereby reducing the Btu content and volume (referred to as "shrinkage").  In
addition, some gas from the gas stream is consumed as fuel during the
processing.  The production costs of such liquids generally depend on the cost
of natural gas being processed and the underlying agreements.  The Company has
compensated its gas suppliers for fuel and shrinkage costs in one of two ways,
either by returning a percentage of the proceeds from the extracted NGLs to the
supplier (a "percent of proceeds" contract) or by replacing an equivalent amount
of gas (a "fuel and shrink" contract).  Due to the volatility of the natural gas
and NGL prices, "percent of proceeds" contracts generally provide a more stable
cash flow.

Of the Company's consolidated revenues, revenues from the gathering and
processing operations represent approximately 4.3, 6.2, and 4.8 percent for
1998, 1997, and 1996, respectively.  Income before interest and income taxes
from the gathering and processing  operation is 15.2, 10.0, and 7.4 percent of
the consolidated income before interest and income taxes for 1998, 1997, and
1996, respectively.

PROPERTY ACQUISITIONS AND SALES - The Company sold its interest in 11 gas
processing plants located in Western Oklahoma on February 1, 1998.  The lack of
ownership of the gathering systems behind these plants was the primary
motivation for the sale.  In a separate transaction, the Company sold its
minority ownership in the Laverne Gas Processing Plant.  The sale of the
Company's interest in the 12 gas processing plants during fiscal 1998
eliminated the Company's interest in "fuel-and-shrink" plants, which are subject
to volatile swings in profitability.

As part of the alliance with Western Resources the Company acquired the Minneola
Gas Processing Plant located in Ford County, Kansas, and increased its ownership
in the Indian Basin Plant to 42 percent.

The Company purchased an additional 55 percent interest in the Sycamore Gas
Gathering System on May 29, 1998. The purchase gives the Company a 97 percent
interest in the system and control over the company-owned production in that
area.

PRODUCTION

GENERAL - The Company's strategy is to concentrate ownership of natural gas and
oil reserves in its service territory in order to add value not only to its
existing production operations but also to integrate it into its processing,
marketing, transmission, gathering, and storage business. As a result, the
Company is focusing its efforts on acquisitions and exploitation activities.

Of the Company's consolidated revenues, revenues from the production operations
represent approximately 1.7, 2.3, and 2.1 percent for 1998, 1997, and 1996,
respectively.  Income before interest and income taxes from the production
operation is 5.4, 6.8, and 2.3 percent of the consolidated income before
interest and income taxes for 1998, 1997, and 1996, respectively.

PRODUCING RESERVES - Natural gas is the primary focus of the Company's
production activities.  As of August 31, 1998, the Company had a working
interest in 1,242 gas wells and 328 oil wells located primarily in Oklahoma,
Kansas, Texas, and Louisiana.  A number of these wells produce from multiple
zones.

MARKET CONDITIONS - The goal of the Company is to develop an economically viable
reserve base through acquisition and development.  Additionally, the Company
plans to become even more active as an operator of the reserve base, which it
controls.  In doing so, the Company competes with many large integrated oil and
gas companies and numerous 

                                       10
<PAGE>
 
independent oil and gas companies of various size. The Company, as an industry
standard, monitors well head prices on a daily basis and, on occasion, has
curtailed some of its natural gas production due to low well head prices . Most
production is sold to third party marketers, including ONEOK Gas Marketing
Company, at spot-market prices.

PROPERTY ACQUISITIONS AND SALES - The Company purchased gas and oil reserves
located in Oklahoma and Kansas from OXY USA, Inc. during the third quarter of
1998. The $128 million purchase includes 400 wells producing approximately 30
million cubic feet of gas per day and 400 barrels of oil per day and a gas
sweetening plant. Based on estimated reserves, this transaction almost doubled
the Company's oil and gas reserves and provided the Company with additional
reserves located in Kansas.

On June 2, 1998, the Company acquired a 40 percent equity interest in K. Stewart
Petroleum Corp., an Oklahoma City based independent oil and gas producer.  This
acquisition creates increased opportunities for the Company to expand its oil
and gas reserves in the Anadarko Basin, one of North America's most prolific gas
fields.  K. Stewart Petroleum Corp. has been successful in applying new
exploration and drilling technologies including 3-D seismic, directional
drilling, magnetic resonance imaging, and advanced completion and stimulation
techniques.  Gross cumulative discoveries by K. Stewart through December 31,
1997, exceed 100 billion cubic feet equivalent (Bcfe).  This transaction also
gives the Company first look at all project development by K. Stewart with the
option to participate at the most favorable industry rate.

The acquisition of Washita Production Company, a Tulsa based independent oil and
gas producer, was closed in December 1997.  The acquisition of Washita, valued
at approximately $20 million, was made with a combination of cash and ONEOK,
Inc. common stock.  The transaction included 235 producing wells and significant
behind pipe and development drilling opportunities with proven reserves of
approximately 23 Bcfe.  The wells are primarily located in the Anadarko and
Arkoma Basin of Oklahoma and include some properties in the Hugoton Basin of
Kansas.

During 1997, the Company purchased PSEC, Inc., an independent oil and gas
company in Oklahoma.  The transaction included 180 wells with proven reserves of
20 Bcf of natural gas and 167,000 barrels of oil.  Included in the transaction
was PSPC, Ltd., which operates and holds a 42 percent interest in the Sycamore
Gas Gathering System.  The purchase was financed with $9.3 million long-term
debt and 334,252 shares of ONEOK Inc. common stock.

During 1996, the Company purchased substantially all of the Oklahoma oil and
natural gas properties of SCANA Petroleum Resources, Inc.  The $43.1 million
purchase included over 500 producing properties of which 90 percent are natural
gas.  Also in 1996, the Company sold all of its oil and gas properties in
Alabama and Mississippi for approximately $18.9 million.

These acquisitions and sales contribute to the Company's long-term strategy of
focusing on natural gas reserves in Oklahoma and Kansas to add value to all of
the Company's gas-related operations.

RISK MANAGEMENT - The Company's production segment continues to utilize
derivatives in order to hedge anticipated sales of oil and natural gas
production.  These anticipated transactions have been hedged with commodity
swaps agreements whereby the Company is able to set the price to be received for
the future production  and thus reduce the risk of declining market prices
between the origination date of the swap and the month of production.  The
Company's strategy in hedging anticipated transactions is to eliminate the
variability in earnings of its production segment as a result of market
fluctuations.  To the extent that management does not terminate a hedge or enter
into an opposing derivative, the current strategy will limit the potential gains
which could result from increases in market prices above the level set by the
hedge.

OTHER BUSINESSES

The Company, through two subsidiaries, owns a parking garage and leases an
office building (ONEOK Plaza) in downtown Tulsa, Oklahoma, in which the
Company's headquarters are located.  The parking garage is owned and operated by
ONEOK Parking Company.  ONEOK Leasing Company leases excess office space to
others.  Almost all downtown Tulsa Class A office space is rented and very
little Class A office space is available city-wide.  As a result, 

                                       11
<PAGE>
 
Class A rental rates are increasing.

ITEM 2.   PROPERTIES

(A)  DESCRIPTION OF PROPERTY 
REGULATED

DISTRIBUTION - The Company owned 15,023 miles of pipeline and other distribution
facilities in Oklahoma and 10,068 miles of pipeline and other distribution
facilities in Kansas at August 31, 1998.  The Company owns a five-story office
building in Oklahoma City, Oklahoma, as well as a number of warehouses, garages,
meter and regulator houses, service buildings, and other buildings throughout
Oklahoma and Kansas.  The Company also owns a fleet of vehicles used primarily
in Oklahoma and maintains an inventory of spare parts, equipment, and supplies.
It leases substantially all of its vehicles operated in Kansas.  In addition,
the Company owns five underground storage facilities located throughout Oklahoma
and two storage facilities in Kansas.  Four of the Oklahoma storage facilities
are located in close proximity to its large market areas; the other storage
facility is located in western Oklahoma and is leased to and operated by another
company.  However, 21.4 billion cubic feet of storage capacity in that facility
has been retained for use by the Company.

TRANSMISSION - The Company owned a combined total of 3,753 miles of transmission
and gathering pipeline in Oklahoma and 1,613 miles in Kansas at August 31, 1998.
Compression and dehydration facilities are located at various points throughout
the pipeline system.

PRODUCTION

The Company owns varying economic interests, including overriding royalty
interests, in 1,372 gas wells and 342 oil wells, some of which are multiple
completions.  Such interests are in wells located primarily in Oklahoma, Kansas,
and Louisiana.  The Company owns 152,652 net onshore developed leasehold acres
and 18,275 net onshore undeveloped acres, located primarily in Oklahoma, Kansas,
Texas, and Louisiana.  The Company owns no offshore acreage.

Lease acreage in producing units is held by production.  Leases not held by
production are generally for a term of three years and may require payment of
annual rentals.

GATHERING AND PROCESSING

The Company owns interests in four gas processing plants which extract liquid
hydrocarbons from natural gas.  Two are located in Oklahoma, one in Kansas and
one in New Mexico.  The Company's share of the total plant capacity of 379.5
million cubic feet per day is 152.7 million cubic feet per day.  The Company
owns approximately a 97 percent interest in the Sycamore Gas Gathering System in
Carter County, Oklahoma and interests in various other gas gathering systems.

OTHER

The Company owns a parking garage and land, subject to a long-term ground lease
expiring in year 2009 with six five-year extensions available, upon which has
been constructed a seventeen-story office building with approximately 517,000
square feet of net rentable space.  The office building is being leased to the
Company at a lease term of 25 years with six five-year renewal options.  After
any renewal period, the Company can purchase the property at its fair market
value.  The Company has occupied and reserved approximately 229,623 square feet
for its own use and leases the remaining space to others.

(B)  OTHER INFORMATION

                                       12
<PAGE>
 
Oil and gas production is defined by the Securities and Exchange Commission
(SEC) to include natural gas liquids in their natural state.  The Company's
processing operations produces  natural gas liquids as a result of ownership in
four gas processing plants, but the Company does not own the reserves
attributable to the gas processed by these plants.  The SEC excludes the
production of natural gas liquids resulting from the operations of gas
processing plants as an oil and gas activity.  Accordingly, the following tables
exclude information concerning the production of natural gas liquids by the
Company's processing operations.

OIL AND GAS RESERVES

All of the oil and gas reserves are located in the United States.

QUANTITIES OF OIL AND GAS RESERVES - See Note Q of Notes to Consolidated
Financial Statements on page 55.

PRESENT VALUE OF ESTIMATED FUTURE NET REVENUES - See Note R of Notes to
Consolidated Financial Statements on page 55.

RESERVE ESTIMATES FILED WITH OTHERS

None.

QUANTITIES OF OIL AND GAS PRODUCED

The net quantities of oil and natural gas produced and sold, including
intercompany transactions, were as follows:

- ------------------------------------
SALES           1998    1997   1996
- ------------------------------------
Oil (MBbls)       330     336    435
Gas (MMcf)     16,818  14,565  9,406
====================================

AVERAGE SALES PRICE AND PRODUCTION (LIFTING) COSTS

Average sales prices and lifting costs are as follows:

- --------------------------------------------------
                             1998    1997    1996
- --------------------------------------------------
Average Sales Price (a)
  Per Bbl of oil            $15.70  $19.84  $17.73
  Per Mcf of gas            $ 2.21  $ 2.16  $ 1.86
 
Average Production Costs
  Per Mcfe (b)              $ 0.50  $ 0.48  $ 0.46
==================================================

(a) In determining the average sales price of oil and gas, sales to affiliated
companies were recorded on the same basis as sales to unaffiliated customers.

(b) For the purpose of calculating the average production costs per Mcf
equivalent, barrels of oil were converted to Mcf using six Mcf of natural gas to
one barrel of oil. Production costs do not include depreciation or depletion.


WELLS AND DEVELOPED ACREAGE

The table shows gross and net wells in which the Company has a working interest
at August 31, 1998.

- -------------------------
                Gas   Oil
- -------------------------
Gross wells    1,242  328
Net wells        431  154
=========================

                                       13
<PAGE>
 
Gross developed acres and net developed acres by well classification are not
available.  Net developed acres for both oil and gas is 152,652 acres.

UNDEVELOPED ACREAGE

The gross and net undeveloped leasehold acreage at the end of the fiscal year is
as follows:

- ---------------------------
             GROSS    NET
- ---------------------------
OKLAHOMA     68,033  17,136
TEXAS         5,627     906
LOUISIANA     1,110     210
ALABAMA          77      23
===========================

Of the net undeveloped acres, approximately 7 percent lies in the Ardmore Basin
area, 36 percent in the Anadarko Basin area in Oklahoma, 19 percent in the
Oklahoma portion of the Arkoma Basin, and 1 percent in the Texas Gulf Coast
area.

NET DEVELOPMENT WELLS DRILLED

The net interest in total development wells drilled, by well classification, is
as follows:

- -------------------------
              Development
- -------------------------
1998
Productive           14.0
Dry                   0.6
- -------------------------
  Total              14.6
- -------------------------
1997
Productive            3.8
Dry                   1.5
- -------------------------
  Total               5.3
- -------------------------
1996
Productive            2.7
Dry                   1.8
- -------------------------
  Total               4.5
=========================

PRESENT DRILLING ACTIVITIES

On August 31, 1998, the Company was participating in the drilling of 21 wells.
The Company's net interest in these wells amounts to 9.22 wells.

FUTURE OBLIGATIONS TO PROVIDE OIL AND GAS

None.

                                       14
<PAGE>
 
ITEM 3.   LEGAL PROCEEDINGS

JOINT APPLICATION OF OKLAHOMA NATURAL GAS COMPANY, A DIVISION OF ONEOK, INC.,
ONEOK GAS TRANSPORTATION COMPANY, A DIVISION OF ONEOK, INC., AND KANSAS GAS
SERVICE COMPANY, A DIVISION OF ONEOK, INC., FOR APPROVAL OF THEIR UNBUNDLING
PLAN FOR NATURAL GAS SERVICES UPSTREAM OF THE CITY GATES OR AGGREGATION POINTS,
Cause PUD No. 980000177, before the Oklahoma Corporation Commission.  On April
1, 1998, a Joint Application was filed to unbundle natural gas services upstream
of the citygate.  As part of the Joint Application (as required by the
Commission's new unbundling rules) a proposal was submitted which would enable
the Applicants to commence competitively-bid service to the Tulsa and Oklahoma
City aggregation areas no later than November 1, 1998.  Kansas Gas Service
Company requested a waiver from having to file an unbundling plan pending
consolidation of its rates with those of Oklahoma Natural Gas Company which was
granted in the Amended Order (see below).  The Applicants filed direct testimony
on April 17, 1998 and certain intervenors filed responsive testimony and
statements of position on June 1, 1998.  Hearings were held beginning July 6,
1998 and continued through July 16, 1998.  The Commission entered its Order on
July 31, 1998 unbundling utility services by separating distribution,
transportation, gas supply, storage and gathering services and directing that
services upstream of the citygates be obtained through competitive bidding.  The
Company was directed to request competitive bids for upstream services for the
Oklahoma City and Tulsa aggregation areas commencing November 1, 1998, and for
the remaining cities and towns as scheduled in the Order.  The Order also
established the cost of service for Oklahoma Natural Gas Company ("ONG") and
ONEOK Gas Transportation Company under which future rates will be determined and
tariffs filed.  On August 6, 1998, a Petition-in-Error was filed with the
Oklahoma Supreme Court appealing the Order of the Commission and a Notice of
Appeal and Motion to Stay the Order was filed with the Commission.  Hearings
were held on such Motion and a Motion to Reconsider by one of the intervenors
and the Commission took the matters under advisement.  The Appeal claims the
Commission lacked jurisdiction and authority to promulgate its unbundling rules
and the Order exceeded its authority.  The Commission filed an Amended Order on
August 20, 1998.  The Company's position is that the Amended Order is invalid
due to the pending appeal of the original Order.  On August 17, 1998, the
Commission filed a Motion to Dismiss the Company's appeal.  The Company filed
its response on September 1, 1998.  On September 8, 1998, the Company filed a
petition-in-error with the Oklahoma Supreme Court appealing the amended order.

IN THE MATTER OF COMMISSIONER BOB ANTHONY'S INSPECTION OF THE BOOKS AND RECORDS
OF ANY PUBLIC SERVICE CORPORATION AND EXAMINATION, UNDER OATH, OF ANY OFFICER,
AGENT OR EMPLOYEE OF SUCH, IN RELATION TO THE BUSINESS AND AFFAIRS OF ARKANSAS
LOUISIANA GAS COMPANY, A DIVISION OF NORAM ENERGY CORP. AND OKLAHOMA NATURAL GAS
COMPANY, A DIVISION OF ONEOK INC. PURSUANT TO OKLAHOMA CONSTITUTION ARTICLE 9,
SECTIONS 18, 28 AND 34, Cause No. PUD 960000039 and related dockets (PUD 86-85,
96-100, 96-186), Oklahoma Corporation Commission.  Commissioner Anthony filed
notice on February 13, 1996, and thereafter sought, in his capacity as an
individual Commissioner, to investigate transactions between the Company and
another entities in connection with the 1993 settlement of a long-running gas
contract dispute between the Company and one of its gas suppliers, Creek
Systems.  The principal subject of the inquiry was a new gas supply arrangement
entered into in connection with the settlement between the Company and an entity
called Dynamic Energy Resources, which in turn assigned its interest in the
contract to two other unrelated companies.  Commissioner Anthony contended that
he was questioning whether the new gas supply arrangement entered into as a
result of the settlement had resulted in excessive gas costs to the Company's
customers.  The gas supply contracts in question had been examined in earlier
audits by the Commission staff and no improper costs or other improprieties had
been found.  After extensive Commission proceedings and an original action in
the Oklahoma Supreme Court challenging Anthony's authority to conduct such an
individual investigation, a compromise was reached among all interested parties
(other than Commissioner Anthony) pursuant to which another Commission staff
investigation of the matter was conducted with full cooperation by the Company.
The staff again found no improper costs or other improprieties.  On August 14,
1997, Commissioner Anthony filed a document prepared by a member of his staff
again claiming overpayment for gas supplied under the contract.  No further
action has been taken by the Commission, however, as a result of the Report, an
Application of Michael Edward McAdams and John Powell Walker For Relief for
Improper and Excessive Costs, Cause No. PUD 98000188 was filed on April 6, 1998
against the Company seeking a review of the gas purchase agreement between the
Company and Dynamic Energy Resources.   On April 29, 1998, ONG filed a motion to
dismiss which was denied by the Administrative Law Judge on September 1, 1998.
ONG appealed the Administrative Law Judge's Order to the Commission en banc on
September 11, 1998.

                                       15
<PAGE>
 
FENT, ET UX V. OKLAHOMA NATURAL GAS COMPANY, A DIVISION OF ONEOK INC., ET AL.,
No. CJ-88-10148, District Court, Oklahoma County.  On October 6, 1988, the
Plaintiffs filed a petition for reimbursement for the cost of replacement of a
yard line and for repairing the gap in piping caused by the relocation of the
meter to the property line and as a class action for similarly situated
customers.  The Company moved to dismiss the action on the grounds the District
Court did not have subject matter jurisdiction and a failure to state a cause of
action for which relief could be granted.  The District Court granted the motion
to dismiss and the Plaintiffs appealed the decision.  On August 14, 1991, the
Court of Appeals reversed the trial court's decision and remanded the case for
further proceedings.  The appellate court held that the trial court had erred in
ruling both that it was without jurisdiction and that the Plaintiffs had failed
to state a cause of action, instead finding that under Commission Rule 6(a) the
Company could be responsible for maintenance of the gas line up to the outflow
side of the meter.  As a result, the Company could have a duty to repair the gap
caused by removal of the meter and to maintain and repair the yard line.  The
case was remanded to the District Court, the Company filed a related proceeding
with the Oklahoma Corporation Commission seeking an interpretation of the
applicable Commission rules, and although the Plaintiffs filed a motion in
District Court to certify the class, further proceedings in the case were stayed
pending resolution of the appeal of the decision in the related Corporation
Commission proceeding.  The Corporation Commission ruled that ONG was not
responsible for non-Fent yard lines. Plaintiffs filed a motion to lift the stay
which was granted by the Court, enabling the case to proceed with discovery on
the issue of whether claims should be certified as a class action and
Plaintiffs' allowed to act as class representatives. The Company filed a motion
to strike on the basis of the Oklahoma Corporation Commission decision in that
had determined that the Company was not responsible for non-Fent yardlines,
which was granted on July 26, 1996.  Fent appealed the decision of the District
Court and on April 8, 1997, the appeal was assigned to Division 2 of the Court
of Appeals.  On December 16, 1997, the Court of Appeals decided in favor of the
Company, upholding the trial court's denial of class certification.  Fent filed
a Petition for Rehearing on January 5, 1998.  The Petition was denied on
February 17, 1998.  Fent then filed a Petition for Writ of Certiorari with the
Supreme Court on March 5, 1998.  The Supreme Court granted Certiorari on April
20, 1998.  The Company filed a Request to File Supplemental Briefs on April 30,
1998, which is still pending.

UNITED STATES OF AMERICA, EX REL. JACK GRYNBERG V. ALASKA PIPELINE CO., ET AL.,
(INCLUDING ONEOK,  INC.), No. 95-725, in the United States District Court for
the District of Columbia.  This is a qui tam action that was commenced on April
17, 1995 (but not served on ONEOK, Inc. until July 24, 1996), by the plaintiff
relator, Jack J. Grynberg ("Grynberg"), on behalf of the United States pursuant
to the False Claims Act, 31 U.S.C. (S) 3729, et seq., to recover the
underpayment of royalties on federally owned or Indian properties from 70 named
pipeline companies, including ONEOK, Inc. Grynberg claims that the named
pipeline companies have underpaid royalties to the United States as a result of
the improper measurement of the heating content and volume of natural gas which
they purchased from the federally owned or Indian lands.  On behalf of the
United States, Grynberg seeks to recover the proceeds for the underpayment of
royalties, interest, treble damages, civil penalties of $5,000 to $10,000 for
each violation by a defendant pipeline company of the False Claims Act, and an
order requiring the defendant pipeline companies to discontinue the improper
practices.  Grynberg also seeks to recover his expenses incurred in bringing the
action, plus attorneys' fees and costs.  The Company, through its division ONEOK
Gas Transportation Company, joined a group of 53 defendants (the "Combined
Defendants") employing the law firm of Skadden, Arps, Slate, Meagher and Flom
LLP ("Skadden, Arps") and sharing their expense in addressing the defenses
against the action which are common to the group.  Skadden, Arps filed on behalf
of the Combined Defendants a motion to dismiss the Second Amended Complaint on
several grounds (e.g., failure to state of claim, failure to plead fraud with
specificity, misjoinder of parties, improper venue, etc.).  The court granted
the motion to dismiss on March 27, 1997, finding that there had been an improper
joinder of the defendants and that Grynberg had failed to state a claim with
particularity against each of the defendants.  On May 15, 1998, Grynberg
appealed the decision to the District of Columbia Court of Appeals.  Motions to
dismiss the action were filed in July, 1998 and the decision of the Court is
pending.  The Company has been recently contacted by the Civil Division of the
Commercial Litigation Branch of the United States Department of Justice asking
it to comment on a separate lawsuit filed by Grynberg against ONEOK, Inc., ONEOK
Resources Company, and Oklahoma Natural Gas Company, in which the same
allegations and claims are made.  The Company is preparing a response to the
Department of Justice.

The Company is a party to other litigation matters and claims which are normal
in the course of its operations, and while the results of litigation and claims
cannot be predicted with certainty, management believes the final outcome of
such matters will not have a materially adverse effect on consolidated results
of operations, financial position, or liquidity.

ITEM 4.   RESULTS OF VOTES OF SECURITY HOLDERS

                                       16
<PAGE>
 
(A)  MATTERS SUBMITTED TO A VOTE OF SECURITY HOLDERS

No matter was submitted during the fourth quarter of the fiscal year covered by
this report to a vote of the Company's security holders, through the
solicitation of proxies or otherwise.

(B)  EXECUTIVE OFFICERS OF THE REGISTRANT

     All executive officers are elected at the annual meeting of directors and
     serve for a period of one year or until their successors are duly elected.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
                                         PERIOD SERVED             BUSINESS EXPERIENCE
NAME AND POSITION            AGE         IN SUCH CAPACITY          IN PAST FIVE YEARS

- -----------------------------------------------------------------------------------------------------------------------------------
<S>                          <C>         <C>                       <C>
 
LARRY W. BRUMMETT            48          1997 to present           Chairman of the Board of Directors and Chief Executive Officer 
Chairman of the Board                    1994 to 1997              Chairman of the Board of Directors, President, and Chief 
and Chief Executive Officer                                        Executive Officer
                                         1993 to 1994              Executive Vice President of Oklahoma Natural Gas Company
 
- -----------------------------------------------------------------------------------------------------------------------------------
DAVID L. KYLE                46          1997 to present           President and Chief Operating Officer
President of ONEOK                       1995 to present           Member of the Board of Directors
and Chief Operating Officer              1994 to 1997              President and Chief Operating Officer of Oklahoma Natural Gas 
                                                                   Company
                                         1993 to 1994              Executive Vice President of Oklahoma Natural Gas Company
 
- -----------------------------------------------------------------------------------------------------------------------------------
JOHN A. GABERINO, JR.        57          1998 to present           Senior Vice President and General Counsel
Senior Vice President and                1993 to 1998              Stockholder, Officer and Director of Gable Gotwals Mock Schwabe
General Council                                                    Kihle Gaberino and predecessor firms
 
- -----------------------------------------------------------------------------------------------------------------------------------
JERRY D. NEAL                59          1993 to present           Vice President, Treasurer, and Chief Financial Officer 
and Chief Financial Officer                                        (Principal Financial Vice President, Treasurer,    
(Principal Financial and   
Accounting Officer)        
                           
- -----------------------------------------------------------------------------------------------------------------------------------
BARRY D. EPPERSON            53          1997 to present           Vice President, Controller, and Chief Accounting Officer
Vice President, Controller,              1993 to 1997              Vice President-Accounting of Oklahoma Natural Gas Company
and Chief Accounting
Officer
 
- -----------------------------------------------------------------------------------------------------------------------------------
EUGENE N. DUBAY              49          1997 to present           President and Chief Operating Officer of Kansas Gas Service 
President and Chief                                                Company 
Operating Officer -                      1996 to 1997              Vice President of Corporate Development
Kansas Gas Service Company               1993 to 1995              Executive Vice President and Chief Operating Officer of Missouri
                                                                   Gas Energy
 
- -----------------------------------------------------------------------------------------------------------------------------------
JAMES C. KNEALE              47          1997 to present           President and Chief Operating Officer of Oklahoma Natural Gas
President and Chief                                                Company
Operating Officer-                       1996 to 1997              Vice President of ONEOK Resources Company
Oklahoma Natural Gas                     1995 to 1996              Vice President-Tulsa District of Oklahoma Natural Gas Company
Company                                  1993 to 1995              Vice President-Accounting of Oklahoma Natural Gas Company

- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                       17
<PAGE>
 
                                   PART II.

ITEM 5.   MARKET PRICE AND DIVIDENDS ON THE REGISTRANT'S COMMON STOCK AND
          RELATED SHAREHOLDER MATTERS

(A)  MARKET INFORMATION

The Company's common stock is listed on the New York Stock Exchange under the
trading symbol OKE. The corporate name ONEOK is used in newspaper stock
listings. The high and low market prices of the Company's common stock for each
fiscal quarter during the last two fiscal years were as follows:

- ---------------------------------------    -------------------------------------
1998                 High        Low       1997                High       Low   
=======================================    =====================================
First Quarter      $40 11/16   $31 3/16    First Quarter      $28  5/8   $24 7/8
Second Quarter     $40 11/16   $ 33 3/8    Second Quarter     $30  7/8   $26
Third Quarter      $44 1/4     $ 34 5/8    Third Quarter      $31  1/8   $25 7/8
Fourth Quarter     $40 15/16   $ 29 3/4    Fourth Quarter     $35 5/16   $30
- ---------------------------------------    -------------------------------------

(B)  HOLDERS

There were 11,768 holders of the Company's common stock at August 31, 1998.
 
(C)  DIVIDENDS

Quarterly dividends declared on the Company's common stock during the last two
fiscal years were as follows:

- --------------------------------
                   1998    1997
- --------------------------------
First Quarter      $0.30   $0.30
Second Quarter     $0.30   $0.30
Third Quarter      $0.30   $0.30
Fourth Quarter     $0.30   $0.30
- --------------------------------
  Total            $1.20   $1.20
================================


Debt agreements pursuant to which the Company's outstanding long-term and short-
term debt has been issued limit dividends and other distributions on the
Company's common stock.  Under the most restrictive of these provisions, $27.4
million of retained earnings is so restricted.  On August 31, 1998, $243.1
million was available for dividends on the Company's common stock.

ITEM 6.   SELECTED FINANCIAL DATA

Following are selected financial data for the Company for each of the last five
years.  Dollar amounts are in millions of dollars, except per share amounts.
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------
                                                  1998       1997       1996       1995       1994
- ----------------------------------------------------------------------------------------------------
<S>                                             <C>        <C>        <C>        <C>        <C>
Operating revenues                              $1,835.4   $1,161.9   $1,224.3   $  954.2   $  784.1
Income before interest
    and income taxes                            $  203.5   $  128.8   $  121.0   $  105.5   $   92.0
Net income                                      $  101.8   $   59.3   $   52.8   $   42.8   $   36.2
Total assets                                    $2,422.5   $1,237.4   $1,219.9   $1,181.2   $1,148.1
Long-term debt                                  $  329.3   $  347.1   $  351.9   $  363.9   $  376.9
Diluted earnings per common share               $   2.44   $   2.13   $   1.93   $   1.58   $   1.34
Dividends per common share                      $   1.20   $   1.20   $   1.18   $   1.12   $   1.11
Percent of payout                                  49.2%      56.2%      61.1%      70.9%      82.8%
Common equity per share                         $  19.01   $  16.47   $  15.21   $  14.38   $  13.88
Return on common equity                           12.46%     12.75%     12.64%     10.90%      9.65%
Ratio of earning to fixed charges                  5.50X      3.51X      3.28X      2.70X      2.52X
Ratio of earnings to combined fixed charges
    and preferred stock dividend requirement       3.20X      3.48X      3.24X      2.67X      2.49X
- ----------------------------------------------------------------------------------------------------
</TABLE>

 ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL

                                       18
<PAGE>
 
          CONDITION AND RESULTS OF OPERATIONS

This Form 10-K (and certain other documents that are incorporated by reference
in this 10-K) contains statements concerning Company expectations or predictions
of the future that are "forward-looking statements" within the meaning of the
Private Securities Litigation Reform Act of 1995.  These statements are intended
to be covered by the safe harbor provision of the Securities Act of 1933 and the
Securities Exchange Act of 1934.  Forward-looking statements are based on
management's beliefs and assumptions based on information currently available.
It is important to note that actual results of Company earnings could differ
materially from those projected in such forward-looking statements.  Factors
that may impact forward-looking statements include, but are not limited to, the
following: (I) the effects of weather and other natural phenomena; (ii)
increased competition from other energy suppliers as well as alternative forms
of energy; (iii) the capital intensive nature of the Company's business; (iv)
economic climate and growth in the geographic areas in which the Company does
business; (v) the uncertainty of gas and oil reserve estimates; (vi) the timing
and extent of changes in commodity prices for natural gas, electricity, and
crude oil; (vii) the nature and projected profitability of potential projects
and other investments available to the Company; (viii) conditions of capital
markets and equity markets; (ix) Year 2000 issues, and (x) the effects of
changes in governmental policies and regulatory actions, including income taxes,
environmental compliance and authorized rates.  Accordingly, while the Company
believes these forward-looking statements to be reasonable, there can be no
assurance that they will approximate actual experience or that the expectations
derived from them will be realized.  When used in Company documents, the words
"anticipate," "expect," "projection," "goal" or similar words are intended to
identify forward-looking statements.  The Company does not have any intention or
obligation to update forward-looking statements after they distribute this 10-K
even if new information, future events or other circumstances have made them
incorrect or misleading.

OPERATING ENVIRONMENT AND OUTLOOK

Management believes that changes in the natural gas business are inevitable and
that such changes will significantly affect the manner in which natural gas and
related services are marketed.  In response to this trend, commencing in 1994,
management conducted a strategic review of its business and of ongoing
developments in the natural gas distribution and energy related industry
regarding competition, regulation, and consolidation.  Management concluded that
the domestic natural gas business was undergoing a process of deregulation which
would lead, over the next several years, to "unbundling" of services at the
residential level.  Management further concluded that markets for electricity
and natural gas were converging and consolidating and that these trends and
competition for customers would alter the structure and business practices of
companies serving these markets in the future.

The Company continues to take steps to strengthen its competitive edge and
position it to be a leader in the industry. The most significant of these steps
was the strategic alliance with Western Resources, Inc. (Western) completed in
November of this fiscal year.  The Company acquired the gas business of Western
and as a result became the eighth largest natural gas distributor in the country
serving approximately 1.4 million customers.

In order to better position the Company competitively, management determined
that it should seek both to expand its current  operations and to become a
provider of energy services not limited to natural gas through acquisitions or
strategic alliances with companies that would enhance and expand its natural gas
distribution, marketing, production, and transportation business.  In a step
toward this goal, ONEOK Power Marketing Company and has been authorized by the
Federal Energy Regulatory Commission (FERC) for the wholesale marketing of
electricity.  Operations have not yet begun.

The Company continues to increase its investment in hydrocarbon reserves in its
service territory in order to add value to its existing production operations.
The Company focus remains on exploitation activities rather than exploratory
drilling.

The Company has strengthened its financial position and anticipates growth
through acquisition opportunities that will add value to all of the Company's
operations, divesting itself of properties that do not fit within the long term
goals of the Company, and maximizing the efficiency of its operations and
assets.

                                       19
<PAGE>
 
OPERATING HIGHLIGHTS INCLUDE:

 .    REGULATED OPERATIONS - The natural gas operations acquired from Western
     represent a strategic fit for the Company's regulated operations as
     unbundling begins to unfold.  Through the alliance, the Company obtained
     both the local gas distribution business and MCMC, an intrastate gas
     transportation company.  MCMC is authorized to provide no-notice gas
     transportation, wheeling, parking, balancing, and storage services to third
     parties based on prevailing market prices.

     Unbundling has the potential to enhance customer choices, provide savings
     to consumers, increase throughput, and allow broader use of the Company's
     assets.  In January 1998, the OCC approved rule-making for the
     restructuring of Oklahoma's  natural gas utility industry.  Under the
     rules, the Company is required to unbundle its upstream activities.
     During the third quarter, the Company  filed an application in Oklahoma in
     compliance with the OCC's new rules governing the restructuring.  The
     filing detailed how the Company plans to unbundle its upstream activities,
     including gas transportation, storage, and supply, that are required by the
     Company's distribution system and solicit competitive bids for those
     services.  The filing also requested permission to lower the volume
     requirements for commercial and industrial customers who wish to
     participate in the PCL program.  On July 31, 1998 the OCC issued an interim
     order on the Company's application that the Company believes exceeds the
     Commission's jurisdiction and authority and contains elements that are an
     "invasion of internal management discretion".  The Company has filed an
     appeal with the Oklahoma Supreme Court.

     In Kansas, the Company has taken the first step toward unbundling its
     services and providing customers choice by filing a proposed tariff change
     reducing the minimum requirement for transportation service to 3,000 Mcf
     annually and to approve a revenue neutral residential basic service charge
     and upstream capacity charges.  If approved, this will allow the KGS to
     expand transportation services to an additional 650 commercial and
     industrial customers and to restructure residential customers bills to
     better reflect the difference between the basic service charge for delivery
     and the cost of natural gas.

 .    NONREGULATED OPERATIONS - The Company continues to enhance the value of it
     non-regulated operations through strategic acquisitions.  Through the
     Western alliance and other acquisitions, the Company has acquired
     additional marketing, gathering, processing, and production businesses
     which complement the activities of the existing operations.

     The 1998 purchase by the Company of oil and gas reserves located in
     Oklahoma and Kansas from OXY USA, Inc. added more than 400 wells to total
     production property.  Net production from these wells is approximately 30
     million cubic feet of gas per day and 400 barrels of oil per day.

     The acquisition of Washita Production Company, a Tulsa based independent
     oil and gas producer, was closed in December 1997. The transaction included
     235 producing wells and significant behind pipe and development drilling
     opportunities with proven reserves of approximately 23 Bcfe.

     The Company sold its interest in 12 non-operated gas processing plants
     during fiscal 1998. The lack of ownership of the gathering systems behind
     these plants was the primary motivation for the sale. The Company no longer
     owns an interest in "fuel-and-shrink" plants, which are subject to volatile
     swings in profitability.

     The June 1998 acquisition of a 40 percent interest in K. Stewart Petroleum
     Corp. increased the opportunities for the Company to expand its oil and gas
     reserve base in the Anadarko Basin, one of North America's most prolific
     gas fields.

     The Company purchased an additional 55 percent interest in the Sycamore Gas
     Gathering System on May 29, 1998. The purchase gives the Company a 97
     percent interest in the system and control over the gathering and
     processing company-owned production in that area.

                                       20
<PAGE>
 
CONSOLIDATED OPERATIONS

- ------------------------------------------------------------------------------
(Thousands of dollars)                         1998        1997        1996
- ------------------------------------------------------------------------------
FINANCIAL RESULTS
Operating revenues - regulated              $  971,905  $  598,390  $  538,169
Operating revenues - nonregulated              863,497     563,537     686,176
- ------------------------------------------------------------------------------
  Total operating revenues                   1,835,402   1,161,927   1,224,345
Operating costs                              1,530,294     959,303   1,030,827
Depreciation, depletion and amortization       101,653      74,509      72,868
- ------------------------------------------------------------------------------
Income before income taxes and interest     $  203,455  $  128,115  $  120,650
==============================================================================

RESULTS OF OPERATIONS - The Company's regulated and nonregulated operations
showed strong gains for the year as a result of the Company's acquisition
strategy and operating efficiencies achieved.  Acquisition of the gas business
from Western added $45 million to income before interest and income taxes in
the regulated operations for the last three quarters of fiscal 1998 despite a
warmer than normal winter.  For the year, income before interest and income
taxes for the regulated operations increased $49.6 million (49.7 percent) over
1997.  Decreases in operating expenses were due to operating efficiencies
including reductions in labor and associated welfare costs.

The increase in the income before interest and income taxes for the nonregulated
operation in fiscal 1998 was related to increased volumes for the marketing
operation, including access to the retail market acquired, as a result of the
Western transaction and gains on the sale of certain gas processing plants .

The performance of the nonregulated operations played a major role in the
increase in income before taxes in 1997. The strong performance reflects the
effect of additional gas reserves acquired, operational changes and
efficiencies, general market conditions and an aggressive marketing campaign by
the Company's gas marketing operation.

RISK MANAGEMENT - To minimize the risk from market fluctuations in the price of
natural gas and oil, the Company's nonregulated operations use commodity
derivative instruments such as future contracts, swaps, and options
(collectively, derivatives) to hedge existing physical gas inventory, and
purchase or sale commitments.  None of these derivatives are held for
speculative purposes and, in general, the Company's risk management policy
requires that positions taken with derivatives be offset by positions in
physical transactions or other derivatives.  For each year in the three year
period ended August 31, 1998, derivatives were primarily used by ONEOK Gas
Marketing as a method of eliminating unacceptable risks with respect to changes
in the price of gas or the cost of the intervening transportation associated
with certain contracts.

Kansas Gas Service Company began using derivative instruments to hedge the cost
of anticipated gas purchases during the winter heating months to protect its
customers from upward volatility in the market price of natural gas.  The gain
or loss resulting from such derivatives will be combined with the physical cost
of gas and recovered from the customer through the gas purchase clause in rates.

The Company's production segment utilizes derivatives in order to hedge
anticipated sales of oil and natural gas production.  These anticipated
transactions have been hedged with commodity swaps agreements whereby the
Company is able to set the price to be received for the future production thus
eliminating the risk of declining market prices between the origination date of
the swap and the month of production.  The Company's strategy in hedging
anticipated transactions is to eliminate the variability in earnings of its
production segment as a result of market fluctuations.  To the extent that
management does not terminate a hedge or enter into an opposing derivative, the
current strategy will limit the potential gains which could result from
increases in market prices above the level set by the hedge.

The Company adheres to policies and procedures which limit its exposure to
market risks from open positions and monitors daily its exposure to market risk.
The results of the Company's derivative trading activities continue to meet its
stated objectives.  For further discussion, see Item 7A - Quantitative and
Qualitative Disclosures About Market Risk at page 31 and Note C of "Notes to
Consolidated Financial Statements."

                                       21
<PAGE>
 
YEAR 2000.  We are currently addressing the effect of Year 2000 (Y2K) issue on
our reporting systems and operations. TheY2K issue arose because many computer
systems and application software (IT applications), and plant and equipment
(Embedded Technology) were constructed using an abbreviated date field which
eliminates the first two digits of the year, assuming that these two digits
would always be "19". On January 1, 2000 these systems may incorrectly recognize
the date as January 1, 1900. Some IT applications and Embedded Technology may
incorrectly process critical financial and operating information or stop
processing altogether.

The Company recognized this potential problem and began rewriting and
remediating its existing IT applications and Embedded Technology.  The Company's
mainframe software is approximately 60 percent compliant with all other systems
being 80 percent compliant.  The Company estimates that approximately 75 percent
of Embedded Technology, which the Company deems significant to their operations,
is year 2000 compliant.  Remediated programs are being tested prior to being
declared compliant.  The estimated completion date of this program is April,
1999, provided that the Company is able to retain, or replace if required, such
key personnel as necessary for the conversion of its remaining programs and
applications.

The primary business risk associated with Y2K is the Company's ability to
continue to transport and distribute gas to its customers without interruption.
In the event the Company  and/or its suppliers and vendors are unable to
remediate the Y2K problem prior to January 1, 2000, operations of the Company
could be significantly impacted.  In order to mitigate this risk, the Company is
developing a contingency plan to continue operations through manual intervention
and other procedures should it become necessary to do so.  Such procedures are
expected to include back-up power supply for its critical pipeline and storage
operations and, if necessary, curtailment of supply.  The Company's significant
storage capacity could be used to supplement system supply in the event its
suppliers can not make deliveries. The Company expects to complete its
operational contingency plan by the end of fiscal 1999.

The Company is assessing operational risks related to suppliers and vendors with
whom they conduct business. Based on this assessment, the Company is in the
process of contacting their suppliers and vendors, deemed to be strategic to its
operations, concerning Y2K compliance. The Company plans to test such third
party compliance to the extent deemed reasonable and necessary to determine
compliance.

There can be no assurance that the Company's systems or the systems of other
companies on which the Company relies, will be converted in a timely manner or
that any such failure to convert would not have a material adverse effect on the
Company.

The Company has spent approximately $1 million  to prepare their systems for Y2K
compliance and expects remaining costs to be comparable.

ACCOUNTING POLICIES - The regulated operations of the Company are primarily
subject to accounting requirements of the OCC, KCC, and the provisions of
Statement of Financial Accounting Standards No. 71 "Accounting for the Effects
of Certain Types of Regulation."  Accordingly, the allocation of costs and
revenues to accounting periods for ratemaking and regulatory purposes may differ
from bases generally applied by nonregulated companies.  Such allocations to
meet regulatory accounting requirements are considered to be generally accepted
accounting principles for regulated utilities provided that there is a
demonstrable ability to recover any deferred costs in future rates.  Pursuant to
the provisions of SFAS No. 71, the regulated business has recognized regulatory
assets of $229.5 million, of which $58.6 million has been established for
amounts not currently being recovered in rates pending Company filings.
However, in the event regulated operations no longer meet the criteria for
following SFAS No. 71 due to unbundling or other actions, a write-off of
regulatory assets and stranded costs may be required.

SEGMENT OPERATIONS - The Company views its segments as operating within either a
rate regulated (regulated operations) or a nonregulated environment
(nonregulated operations).  The nonregulated environment is further viewed as
having three primary, vertically integrated segments: marketing, gathering and
processing, and production.

                                       22
<PAGE>
 
REGULATED OPERATIONS

The regulated business unit provides natural gas distribution, transportation,
gas supply, and storage services in Oklahoma and Kansas. The Company's
operations in Oklahoma are conducted through Oklahoma Natural Gas Company
Division, ONEOK Gas Transportation Company Division and three wholly-owned
subsidiaries, ONEOK Gas Transportation, L.L.C., ONG Transmission Company, and
ONG Sayre Storage Company, which together form an integrated intrastate natural
gas distribution and transmission business which serves residential, commercial,
and industrial customers in about 75 percent of the state of Oklahoma. These
companies will be collectively referred to herein as Oklahoma Natural Gas (ONG).
The Company's operations in Kansas are conducted through Kansas Gas Service
Company Division (Kansas Gas Service) and Mid Continent Market Center (MCMC), a
wholly owned transportation company. These companies will be collectively
referred to herein as KGS. KGS's regulated gas operations are primarily engaged
in distribution and intrastate gas transportation, as well as gas wheeling,
parking, balancing and storage services. Kansas Gas Service serves residential,
commercial, and industrial customers in about 67 percent of Kansas. Kansas Gas
Service also conducts regulated gas distribution operations in northeastern
Oklahoma. ONG is subject to regulatory oversight by the OCC. KGS and MCMC are
subject to regulatory oversight by the KCC and/or the OCC.

Identifiable assets at August 31, 1998, included $972.6 million acquired through
the alliance with Western.

- ------------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                        1998      1997      1996
- ------------------------------------------------------------------------
FINANCIAL RESULTS
Gas Sales                                   $883,089  $543,662  $487,294
Cost of Gas                                  527,738   308,057   247,299
- ------------------------------------------------------------------------
  Gross margins on gas sales                 355,351   235,605   239,995
PCL, ECT and transportation margins           81,763    41,974    41,684
Other revenues                                29,897    13,890    11,394
- ------------------------------------------------------------------------
  Net revenues                               467,011   291,469   293,073
Operating expenses                           238,607   140,328   145,299
Depreciation, depletion and amortization      79,032    51,375    50,805
- ------------------------------------------------------------------------
Income before income taxes and interest     $149,372  $ 99,766  $ 96,969
========================================================================


- -------------------------------------------------
                              1998   1997   1996
- -------------------------------------------------
Gross Margin per Mcf
OKLAHOMA
  Residential                 $2.99  $2.94  $3.09
  Commercial                  $2.40  $2.19  $2.28
  Industrial                  $1.13  $0.95  $0.85
  Pipeline capacity leases    $0.24  $0.19  $0.20
KANSAS
  Residential                 $2.24      -      -
  Commercial                  $1.75      -      -
  Industrial                  $1.92      -      -
  End-use customer                       -      -
    transportation            $0.56
=================================================

- ------------------------------------------------------------------
                                       1998       1997      1996
- ------------------------------------------------------------------
Number of customers
  Oklahoma                             739,684   733,621   729,467
  Kansas                               652,330         -         -
- ------------------------------------------------------------------
    Total                            1,392,014   733,621   729,467
- ------------------------------------------------------------------
- ------------------------------------------------------------------
Capital expenditures (thousands)
  Oklahoma                          $   67,792  $ 67,747  $ 42,900
  Kansas                                46,032         -         -
- ------------------------------------------------------------------
    Total                           $  113,824  $ 67,747  $ 42,900
- ------------------------------------------------------------------
- ------------------------------------------------------------------
Identifiable assets (millions)      $    1,932  $  1,026  $  1,019
- ------------------------------------------------------------------
- ------------------------------------------------------------------
Customers per employee
  Oklahoma                                 475       477       403
  Kansas                                   489         -         -
- ------------------------------------------------------------------


OPERATIONAL HIGHLIGHTS - The Company dominates the core energy service markets
with over a 90 percent market share for water heating, cooking, and home
heating.  Annual cost comparisons with electricity for these same services in
Oklahoma and Kansas indicate that gas costs were at least 50 percent less, the
largest difference being in home heating at 70 percent less.  On a gas to gas
comparison, the Company's  rates in Oklahoma and Kansas were lower than the
regional and national averages for residential, firm industrial, and
interruptible service.

Highlights of significant operating changes over the past three years include:

 .       Addition of approximately 660,000 new distribution customers and 1,400
        employees in KGS acquisition.

                                       23
<PAGE>
 
 .       Signed contract and began transporting gas to four natural gas-fired
        electric generating plants owned by Public Service Company of Oklahoma
        under PCL agreements. Construction on facilities to serve the plants was
        completed early in fiscal 1998.

 .       Strengthened cost controls throughout the organization. Total employees
        in Oklahoma dropped by approximately 9.63 percent during the 1998 fiscal
        year. This was accomplished through attrition and without compromising
        customer safety or service. Operating expense per customer decreased 4.5
        percent.

 .       Injection capabilities were increased by 70 percent in one Oklahoma
        storage field while withdrawal capabilities were increased by over 80
        percent. In another Oklahoma storage field, work will be completed by
        December, 1998 which will increase the injection capabilities by 50
        percent and double the withdrawal capabilities.

 .       A $10 million project to increase the capacity of a storage field in
        Kansas is scheduled for completion in 2000. Total storage capacity in
        Kansas will increase by almost 40 percent.

REGULATORY INITIATIVES -  The KCC has approved a pilot program designed to
moderate the cost its customers pay for natural gas in cold weather months.
Under the program, Kansas Gas Service will use hedges to cap the price of its
anticipated winter heating season gas purchases in order to protect customers
from the upward volatility during the winter heating months.

The KCC has  approved a pilot program in Kansas that would offer residential
customers the option of paying a fixed monthly bill.  The program will allow a
qualified residential customer the option of paying an amount based on the
projected average annual usage rather than actual usage.  The program will
initially be offered to 100,000 customers. A similar program is already in
effect for customers in Oklahoma.

In a first step toward unbundling in Kansas, a proposed tariff change was filed
which would reduce the minimum requirement for transportation service to 3,000
Mcf annually and approve a revenue neutral residential basic service charge and
upstream capacity charges.  If approved, this will allow KGS to extend
transportation services to an additional 650 commercial and industrial customers
and restructure residential customer bills to better reflect the differences
between the basic service charge for delivery and the cost of natural gas.

During fiscal 1998, ONG filed an application in Oklahoma in compliance with the
Oklahoma Corporation Commission's (OCC) new rules governing the restructuring of
the state's natural gas industry.  Since then, the Company and the OCC have
reached an impasse.  The ultimate outcome of these proceedings and their impact,
if any, on future earnings and cash flow can not be predicted at this time.

CAPITAL EXPENDITURES -  The Company's capital expenditure program includes
expenditures for extending service to new areas, increasing system capabilities,
and general replacements and betterments. It is the Company's practice to
maintain and periodically upgrade facilities to assure safe, reliable, and
efficient operations. The 1998 capital expenditure program included $19 million
for new business development including $5.3 to provide service to Public Service
Company of Oklahoma's (PSO) gas-fired electric generation plants and $12 million
to improve injection capabilities and peak storage deliverability. The 1997
capital expenditure program included $49 million for new business development
including $13.4 to provide service to PSO's four power plants and $7 million to
improve compression and peak storage deliverability. The 1996 capital
expenditure program included $10 million for new business development and $2
million to improve peak storage deliverability.

OPERATING RESULTS - Net revenues and operating expenses increased over the same
period one year ago, primarily due to inclusion of KGS's operations since
December 1, 1997. On a pro forma basis, assuming the Western acquisition had
occurred at the beginning of fiscal 1997, net revenues and operating expenses
would have been $514.3 million and $279.7 million, respectively, for fiscal 1998
as compared to $644.7 million and $297.3 million respectively, for fiscal 1997.
The decrease in pro forma net revenues in the current year reflects the fact
that KGS's rates are not weather normalized as are ONG's and, accordingly, were
negatively impacted by warmer than normal weather. Pro forma operating expenses
have declined in the current year reflecting ongoing efforts to improve
operating efficiencies while
                                       24
<PAGE>
 
increasing total customers served. Personnel costs, including pensions and
postretirement costs, on a pro forma basis, decreased from the prior year
partially due to a reduced personnel complement achieved solely through
attrition. Other cost reductions related to occupancy costs and reduced levels
of contract labor.

In 1997 lower gross margins on gas sales result primarily from lower usage by
customers whose gas sales and degree days are not normalized, increased cost of
gas used in operations, and unrecovered gas costs.  Actual degree days in 1997
were 3,566 as compared to 3,617 in 1996.  Degree days is an industry measure of
temperature variations from an established normal temperature of 65 degrees; a
higher number of degree days reflects colder weather on the average. Operating
expenses decreased in 1997 as compared to 1996 primarily due to reductions in
labor and associated employee welfare costs.

The statistics presented for the 1998 fiscal year include volumes attributable
to Kansas Gas Service since December 1, 1997.

- -----------------------------------------------------------
                                   1998     1997     1996
- -----------------------------------------------------------
Volumes (MMcf)
Gas sales
    Residential                   103,700   58,241   55,801
    Commercial                     42,452   29,408   28,548
    Industrial                      7,262   11,384   15,145
PCL and ECT                       226,058  173,134  158,527
- -----------------------------------------------------------
  Total gas sales, PCL and ECT    379,472  272,167  258,021
===========================================================

NONREGULATED OPERATIONS

The Company's nonregulated operations are involved in the marketing, gathering
and processing, and production of natural gas and natural gas liquids.  The gas
marketing subsidiary has directed its activities toward wholesale and retail
sales in the mid-continent region of the United States.  The Company's interests
in gas liquids extraction plants and producing properties are concentrated
principally in Oklahoma, Kansas, and New Mexico.  The production subsidiary has
concentrated on production in existing fields.  The Company also operates its
headquarters office building and a parking garage.


- ------------------------------------------------------------------------
(Thousands of dollars)                        1998      1997      1996
- ------------------------------------------------------------------------
FINANCIAL RESULTS
COMBINED NONREGULATED OPERATIONS
Gas Sales                                   $774,455  $484,674  $612,595
Cost of Gas                                  758,688   470,878   596,491
- ------------------------------------------------------------------------
  Gross margins on gas sales                  15,767    13,796    16,104
Gas and oil production                        42,315    38,159    25,181
Gas processing (net)                          22,846    25,326    20,902
Other                                         49,090     9,534    16,560
- ------------------------------------------------------------------------
  Net revenues                               130,018    86,815    78,747
Operating expenses                            53,314    35,332    33,002
Depreciation, depletion and amortization      22,621    23,134    22,064
- ------------------------------------------------------------------------
Income before income taxes and interest     $ 54,083  $ 28,349  $ 23,681
========================================================================

- -------------------------------------------------------
                               1998     1997     1996
- -------------------------------------------------------
Natural gas volumes (MMcf)
  Marketing                   334,364  205,204  309,965
  Natural gas production       16,818   14,565    9,406
  Residue gas                   5,771    6,109    6,883
- -------------------------------------------------------
Total natural gas volumes     356,953  225,878  326,254
- -------------------------------------------------------
Less intersegment sales
  Marketing                    13,392    9,384    7,822
  Natural gas production        5,306    6,652    3,978
  Residue gas                   5,771    6,109    6,880
- -------------------------------------------------------
Total intersegment sales       24,469   22,145   18,680
- -------------------------------------------------------
Net natural gas volumes       332,484  203,733  307,574
=======================================================

MARKETING

OPERATIONAL HIGHLIGHTS - The Company's marketing operation purchases and markets
natural gas, primarily in the mid-continent area of the United States.  The
Company continues to focus on daily trading rather than on low margin baseload
trading.  The alliance with Western has significantly increased gas sales
volumes by adding a retail customer base.  In 1997, the Company was the
successful bidder to serve four gas-fired electric generating plants owned by
Public Service Company of Oklahoma.

                                       25
<PAGE>
 
- -----------------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                            1998      1997       1996
- -----------------------------------------------------------------------------
Natural gas sales                               $774,455  $484,674   $612,595
Cost of Gas                                      758,688   470,878    596,491
- -----------------------------------------------------------------------------
  Gross margins on gas sales                      15,767    13,796     16,104
Other                                              4,159    (1,475)     1,221
- -----------------------------------------------------------------------------
  Operating revenues                              19,926    12,321     17,325
Operating costs, net                               7,024     3,991      3,931
Depreciation, depletion
    and amortization                                 561       482        484
- -----------------------------------------------------------------------------
Income before income taxes and interest         $ 12,341  $  7,848   $ 12,910
=============================================================================

- ----------------------------------------------------------------
                                      1998      1997      1996
- ----------------------------------------------------------------
OPERATING INFORMATION
Natural gas volumes (MMcf)           334,364   205,204   309,965
Capital expenditures (thousands)    $      0  $    373  $    370
Identifiable assets (thousands)     $123,936  $ 63,828  $ 71,186
================================================================

PRICE RISK MANAGEMENT - In order to mitigate the financial risks arising from
fluctuations in both the market price and transportation costs of natural gas,
the Company routinely enters into natural gas futures contracts, swaps, and
options as a method of protecting its margins on the underlying physical
transactions.  However, net open positions in terms of price, volume, and
specified delivery point do occur.  For further discussion, see Item 7A -
Quantitative and Qualitative Disclosures About Market Risk.

OPERATING RESULTS - The increase in gross margins is primarily attributable to
increased throughput; however, this was offset by lower gross margins per Mcf.
Lack of extreme weather changes across the country during this year's winter
resulted in less volatility in prices and less opportunity to take advantage of
the volatility. Increased sales volumes are due to additional customers acquired
in the alliance with Western and the addition of service to the four gas-fired
electric generating plants owned by Public Service Company of Oklahoma. The
increase in operating costs is due to the additional expenses related to retail
marketing.

The Company's focus on daily trading and away from baseload trading had a
significant impact on the operating results of the marketing segment in 1997.
Overall gross margins per Mcf increased in 1997 over the prior year despite a
decrease in both volumes sold and total gross margins. The decrease in volumes
is indicative of management's decision to forgo baseload business in order to
further develop its daily trading practice. Margins in the daily trading were
favorably affected by weather related demand. The decrease in other operating
revenue in 1997 over 1996 is the result of a non-recurring charge.

GATHERING AND PROCESSING

OPERATIONAL HIGHLIGHTS - The Company's processing operation owns and operates
two gas processing plants and has nonoperating interests in two gas processing
plants and related gathering systems.  The gas processing operations include the
extraction of natural gas liquids (NGL's) and the separation ("fractionation")
of mixed NGLs into component products (e.g., ethane/propane mix, propane, iso
and normal butane, and natural gasoline).  The component products are used for
petrochemical feedstock, residential heating and cooking in rural areas, and
blending into motor fuels.  The industry as a whole operates substantial numbers
of such plants, many owned by large integrated oil and gas companies and
independents.

The Company's gathering operation supplies gas gathering and compression
services to producers.  The purchase of an additional 55 percent interest in the
Sycamore Gas Gathering System effective June 1, 1998, gives the Company control
over the company-owned production in that area.  The Company's sale of its
interest in eleven gas processing plants in the second quarter and one gas
processing plant in the third quarter of 1998 eliminated the Company's interest
in "fuel-and-shrink" plants, which are subject to volatile swings in
profitability.  Through the Western alliance in fiscal 1998, the Company
acquired the Minneola Gas Processing Plant located in Kansas and an additional
34 percent interest in the Indian Basin Plant.  An eight percent interest in the
Indian Basin had been acquired in fiscal 1997.

                                       26
<PAGE>
 
- -------------------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                                1998      1997     1996
- -------------------------------------------------------------------------------
Gas processing (net)                                 $21,646  $23,107   $18,423
Gathering                                                363        -         -
Other                                                 19,187      (65)      261
- -------------------------------------------------------------------------------
  Operating revenues                                  41,196   23,042    18,684
Operating costs, net                                   7,988    7,770     7,641
Depreciation, depletion
    and amortization                                   2,249    2,393     2,063
- -------------------------------------------------------------------------------
Income before income taxes and interest              $30,959  $12,879   $ 8,980
===============================================================================

- ----------------------------------------------------------------
                                      1998      1997      1996
- ----------------------------------------------------------------
 OPERATING INFORMATION
Residue gas (MMcf)                     5,771     6,109     6,883
Natural gas liquids (MGal)           197,342   200,143   195,979
Average NGL's price (MGal)          $  0.302  $  0.365  $  0.297
Fuel & Shrink price (MMbtu)         $   2.56  $   2.07  $   1.82
Capital expenditures (thousands)    $ 18,379  $ 10,563  $  5,183
Identifiable assets (thousands)     $ 63,214  $ 36,049  $ 26,870
================================================================

CAPITAL EXPENDITURES - The Company purchased an additional 55 percent interest
in the Sycamore Gas Gathering System in 1998 giving the Company a 97 percent
interest in the system and control over the company-owned production in that
area. The remaining $10.3 million in capital expenditures relates to the
purchase of additional gas plant interests and $3.8 million in capital required
to sustain operations. Fiscal 1997 expenditures included $9 million incurred to
purchase an interest in the Indian Basin Plant as well as sustain and improve
operations. The remaining expenditures and those in 1996 generally relate to
sustaining capital improvements.

OPERATING RESULTS - The Company's sale of its interest in 12 gas processing
plants in 1998 resulted in a decrease in volumes over the same period one year
ago. This was partially offset as a result of the additional interest in the
Indian Basin Plant and the addition of the Minneola Plant. Average NGL price per
gallon decreased for the year over one year ago as prices continue to experience
a downward correction from the abnormally high prices prevalent throughout much
of fiscal 1997 and coincide with a decline in crude oil prices. Other revenue
includes the gain on the sale of the "fuel and shrink" plants.

Volumes of natural gas liquids sold increased and higher product prices resulted
in an increase in natural gas liquids revenues for 1997.  Volumes declined in
1996 due to some periods of ethane rejection but natural gas liquids were
strengthened by increased prices.

PRODUCTION

OPERATIONAL HIGHLIGHTS - The Company's strategy is to concentrate ownership of
hydrocarbon reserves in its service territory in order to add value not only to
its existing production operations but also to the related gathering and
processing, marketing, transportation, and storage businesses.  Accordingly, the
Company focuses on exploitation activities rather than exploratory drilling.  As
a result of recent acquisitions, the number of wells the Company operates has
increased.  In its role as operator, the Company controls operating decisions
which impact production volumes and lifting costs.

- ---------------------------------------------------------------------------
(Thousands of dollars)                             1998     1997     1996
- ---------------------------------------------------------------------------
Natural gas sales                                 $37,123  $31,496  $17,465
Oil sales                                           5,192    6,663    7,716
Liquids and residue                                 1,200    2,219    2,478
Other                                                 940      699    5,675
- ---------------------------------------------------------------------------
  Operating revenues                               44,455   41,077   33,334
Operating costs, net                               14,671   12,468   11,341
Depreciation, depletion
    and amortization                               18,872   19,899   19,161
- ---------------------------------------------------------------------------
Income before income        taxes and interest
                                                  $10,912  $ 8,710  $ 2,832
===========================================================================

- ---------------------------------------------------------------
                                      1998      1997     1996
- ---------------------------------------------------------------
Proved reserves
  Gas (MMcf)                         178,047    83,293   74,068
  Oil (MBbls)                          3,272     2,014    2,010
- ---------------------------------------------------------------
Production
  Gas (MMcf)                          16,818    14,565    9,406
  Oil (MBbls)                            330       336      435
- ---------------------------------------------------------------
Average price
  Gas (Mcf)                         $   2.21  $   2.16  $  1.86
  Oil (Bbls)                        $  15.70  $  19.84  $ 17.73
- ---------------------------------------------------------------
Capital expenditures (thousands)    $167,669  $ 32,911  $46,733
Identifiable assets (thousands)     $246,102  $100,062  $73,648
===============================================================

RISK MANAGEMENT - Since the volatility of energy prices has a significant impact
on the profitability of this segment, the Company utilizes commodity derivative
instruments in order to offset this risk. As of August 31, 1998,

                                       27
<PAGE>
 
approximately 50 percent of anticipated production in 1999 has been hedged
primarily with swap agreements. This compares to 25 percent of 1998 production
hedged at August 31, 1997. See Item 7A - Qunatitative and Qualitative Disclosure
about Market Risk.

CAPITAL EXPENDITURES - The Company purchased natural gas and oil reserves from
OXY USA, Inc. in fiscal 1998.  The reserves are located in Oklahoma and Kansas
and include more than 400 wells.  Net production is approximately 30 million
cubic feet of gas per day and 400 barrels of oil per day and includes a gas
sweetening plant.  The purchase price was approximately $128 million before
adjustments.  Based on estimated reserves, this transaction will almost double
the Company's oil and gas reserves.

A 40 percent equity interest in the K. Stewart Petroleum Corp., was acquired on
June 2, 1998.  The acquisition creates opportunities to expand ownership of oil
and gas reserves in the Anadarko Basin and for the Company to achieve its
strategic objective of growing its reserves base in areas where it has other
energy-related operations.

The acquisition of Washita Production Company was closed in December, 1997.  The
acquisition of Washita, valued at approximately $20 million, was made with a
combination of cash and ONEOK, Inc. common stock.  The transaction includes 235
producing wells and significant behind pipe and development drilling
opportunities with proven reserves of approximately 23 billion cubic feet
equivalent.  The wells are primarily located in the Anadarko and Arkoma Basin of
Oklahoma and include some properties in the Hugoton Basin of Kansas.

During 1997, the Company purchased PSEC, Inc., an independent oil and gas
company in Oklahoma.  The transaction included 180 wells with proven reserves of
20 Bcf of natural gas and 167,000 barrels of oil.  Included in the transaction
was PSPC, Ltd., which operates and holds a 42 percent interest in the Sycamore
Gas Gathering System.  The purchase was financed with $9.3 million in long-term
debt and 334,252 shares of ONEOK Inc. common stock.

Capital expenditures primarily related to a limited developmental drilling
program were approximately $16.5 million, $6.7 million, and $3.4 million in
1998, 1997, and 1996, respectively.

OPERATING RESULTS - The increased gas production is primarily related to the
additional proved reserves acquired as a result of the  OXY, PSEC and Washita
Production Company property acquisitions.  Production from these properties more
than offset the natural decline in production from other fields.  The increase
in operating costs in 1998 as compared to one year ago is indicative of the
increase in the total number of fields owned by the Company.

The increase in gas production volumes in 1997 over 1996 was attributable to the
effects of gas reserves acquired in the latter part of fiscal 1996 and
operational changes and efficiencies.  The increase in the average price of gas
and oil in 1997 was attributable to general market conditions.  The Company
recognized an $8.6 million impairment loss in fiscal 1996 upon the adoption of
Statement of Financial Accounting Standard No. 121, Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed of.

LIQUIDITY AND CAPITAL RESOURCES

In August 1998, the Company registered a shelf filing for $400 million in debt
securities.  The filing allows the Company to sell the debt securities over a
two year period as needed.  These funds will be used in the future to retire
short-term debt and for other general corporate purposes.

CASH FLOW ANALYSIS

Cash provided by operating activities remains strong and continues as the
primary source for meeting cash requirements. However, due to seasonal
fluctuations and additional capital requirements, the Company periodically
accesses funds through short-term credit agreements and, if necessary, through
long-term borrowing.  The Company believes that internally generated funds and
existing credit agreements will be sufficient to meet its debt service, dividend
payment, and capital expenditure requirements, excluding significant capital
acquisitions.  The following discussion of cash flows should be read in
conjunction with the Company's "Consolidated Statement of Cash Flows" and the
supplemental cash flow information included in Note M of "Notes to Consolidated
Financial Statements."

                                       28
<PAGE>
 
OPERATING CASH FLOWS

Operating cash flows for the year ended August 31, 1998, increased substantially
as compared to the same period in 1997.  This increase is due to the liquidation
of the abnormally high net working capital acquired in the Western acquisition,
increased operating income and favorable changes in assets and liabilities,
including recovery of purchased gas costs.

Operating cash flows for 1997 as compared to 1996 are higher as a result of
higher earnings and lower net invested working capital.  The lower net invested
working capital is primarily due to lower levels of gas in storage and recovery
of purchased gas costs.

- ---------------------------------------------------------------------
FOR THE YEARS ENDED AUGUST 31,             1998      1997      1996
(THOUSANDS OF DOLLARS)
=====================================================================
Cash provided by operating activities    $346,526  $152,051  $105,050
- ---------------------------------------------------------------------

INVESTING CASH FLOWS
 
- ---------------------------------------------------------------
FOR THE YEARS ENDED AUGUST 31,         1998     1997     1996
(THOUSANDS OF DOLLARS)
===============================================================
Cash used in investing activities    $299,714  $88,832  $71,985
- ---------------------------------------------------------------

          [CAPITAL EXPENDITURES AND ACQUISITIONS GRAPH APPEARS HERE]

- ------------------------------------------------
CAPTIAL          1999E   1998    1997    1996
- ------------------------------------------------
[x] expenditures   $268.0  $140.9  $77.7   $52.3
- ------------------------------------------------
[ ] acquisitions     -     $165.5  $34.3   $43.1
- ------------------------------------------------

CAPITAL EXPENDITURES - Capital expenditures totaled $306 million in  1998.
Acquisition of production and processing assets totaled approximately $164
million, $34 million, and $43 million for 1998, 1997, and 1996, respectively.
Capital expenditures for 1999 are estimated to be $268 million.


ASSET SALES - Approximately $30 million of proceeds was received in fiscal 1998
from the sale of gas processing assets. Approximately $18 million of proceeds
was received in 1996 resulting from the sale of production assets.

FINANCING CASH FLOW
 
- --------------------------------------------------------------
FOR THE YEARS ENDED AUGUST 31,        1998     1997     1996
(THOUSANDS OF DOLLARS)
==============================================================
Cash used in financing activities    $61,103  $49,440  $44,966
- --------------------------------------------------------------

SHORT-TERM DEBT - At August 31, 1998, $212 million of short-term debt was
outstanding.  A short-term unsecured credit agreement with several banks
provides aggregate borrowing of up to $200 million for general corporate
purposes.  The Company also has additional credit facilities available through a
master note with Bank of America.  The maximum amount of short-term debt
authorized by the Board of Directors is $225 million.  Fluctuation in the amount
of cash used in financing activities in each of the years presented is primarily
a factor for short-term borrowing and the significant increase in preferred
stock dividend requirements.

LONG-TERM DEBT - As of August 31, 1998, the Company could have issued $874
million of additional long-term debt under the most restrictive provisions
contained in its various borrowing agreements.  At August 31, 1998, the equity
component was 68 percent as compared to 54 percent a year ago.  On December 1,
1997, Moody's Investors Service announced that it had upgraded the Company's
debt rating from A3 to A2 due to the benefits expected from the 

                                       29
<PAGE>
 
acquisition of the gas business, including strengthened market and financial
positions. The debt rating by Standard and Poor's Corporation was upgraded from
A- to A. Long-term debt in the amount of $9.3 million was issued in 1997 as
partial payment for PSEC, Inc. and affiliates.

STOCK AND DIVIDENDS - The Company had approximately 32 million shares of common
stock outstanding at August 31, 1998.  The Common stock dividends were $1.20,
$1.20, and $1.18 per share in 1998, 1997, and 1996, respectively. Convertible
preferred stock dividends were $1.80 and $1.50 per share in 1998 for Series A
and Series B, respectively. Preferred stock dividends were, $1.78, and $2.38 per
share in 1997 and 1996, respectively.  Through the Company's Stock Purchase and
Dividend Reinvestment Program $4.1 million and $5.5 million of dividends were
reinvested into common stock in 1998 and 1997, respectively.

LIQUIDITY

The regulated segment continues to face competitive pressure to serve the
substantial market represented by its large volume customers.  The loss of a
substantial portion of that load, without recoupment of the revenues from that
loss, could have a materially adverse effect on the Company's financial
condition. However, since 1995, rates have been structured to reduce the
Company's risk in serving its large volume customers.

OTHER

ENVIRONMENTAL - In connection with the Western transaction, the Company acquired
12 manufactured gas sites located in Kansas which may contain coal tar and other
potentially harmful materials that are classified as hazardous material.
Hazardous materials are subject to control or remediation under various
environmental laws and regulations. A consent agreement with the Kansas
Department of Health and Environment (KDHE) presently governs all future work at
these sites.  The terms of the consent agreement allow the company to
investigate these sites and set remediation priorities based upon the results of
the investigations and risk analysis.  The prioritized sites will be
investigated over a ten year period.  At August 31, 1998, the costs of the
investigations and risk analysis have been minimal. Limited information is
available about the sites and no testing has been performed.  Management's best
estimate of the cost of remediation ranges from $100 thousand to $10 million per
site based on a limited comparison of costs incurred to remediate comparable
sites.  These estimates do not give effect to potential insurance recoveries,
recoveries through rates or from third parties.  The KCC has permitted others to
recover their remediation costs through rates.  It should be noted that
additional information and testing could result in costs significantly below or
in excess of the amounts estimated above. To the extent that such remediation
costs are not recovered, the costs could be material to the Company's results of
operations and cash flows depending on the degree of remediation required and
number of years over which the remediation must be completed.

NEW ACCOUNTING PRONOUNCEMENTS - In June 1997, the Financial Accounting Standards
Board (FASB) issued Statement of Financial Accounting Standards No. 130,
Reporting Comprehensive Income (SFAS 130). SFAS 130 establishes standards for
reporting and display of comprehensive income and its components in a full set
of general purpose financial statements. It does not, however, specify when to
recognize or how to measure items that make up comprehensive income. SFAS 130
was issued to address the concerns over the practice of reporting elements of
comprehensive income directly in equity. SFAS 130 is effective for annual
periods beginning after December 15, 1997.

In June 1997, the FASB issued Statement of Financial Accounting Standards No.
131, Disclosures about Segments of an Enterprise and Related Information (SFAS
131).  SFAS 131 supersedes SFAS No. 14, Financial Reporting for Segments of a
Business Enterprise but retains the requirement to report information about
major customers.  SFAS 131 replaces the "industry segment" concept of Statement
14 with a "management approach" concept as the basis for identifying reportable
segments.  The management approach is based on the way that management organizes
the segments within the enterprise for making operating decisions and assessing
performance.  Consequently, the segments are evident from the structure of the
enterprise's internal organization.  It focuses on financial information that an
enterprise's decision makers use to make decisions about the enterprise's
operating matters.  SFAS 131 is effective for financial statements for periods
beginning after December 15, 1997, and is not anticipated to have a significant
impact on the Company's segment reporting.

In February 1998, the FASB issued Statement of Financial Accounting Standards
No. 132, Employers' Disclosures 

                                       30
<PAGE>
 
about Pensions and Other Postretirement Benefits (SFAS 132), which is required
to be implemented for fiscal years beginning after December 15, 1997. SFAS 132
revises employers' disclosures about pension and other postretirement benefit
plans. It does not change the measurement or recognition of those plans.

Statement of Financial Accounting Standards No. 133, Accounting for Derivatives
Instruments and Hedging Activities (SFAS 133), was issued by the FASB in June
1998.  Statement 133 standardizes the accounting for derivatives instruments,
including certain derivative instruments embedded in other contracts.  Under the
standard, entities are required to carry all derivative instruments in the
balance sheet at fair value.  The accounting for changes in the fair value of a
derivative instrument depends on whether it has been designated and qualifies as
part of a hedging relationship and, if so, on the reason for holding it.  If
certain conditions are met, entities may elect to designate a derivative
instrument as a hedge of exposures to changes in fair values, cash flows, or
foreign currencies.  If the hedge exposure is a fair value exposure, the gain or
loss on the derivative instrument is recognized in earnings in the period of
change together with the offsetting loss or gain on the hedged item attributable
to the risk being hedged.  If the hedged exposure is a cash flow exposure, the
effective portion of the gain or loss on the derivative instrument is reported
initially as a component of other comprehensive income (outside earnings) and
subsequently reclassified into earnings when the forecasted transaction affects
earnings.  Any amounts excluded from the assessment of hedge effectiveness as
well as the ineffective portion of the gain or loss is reported in earnings
immediately.  The Company must adopt Statement 133 by September 1, 1999;
however, early adoption is permitted.

ITEM  7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

RISK MANAGEMENT - The Company, substantially through its nonregulated segments,
is exposed to market risk in the normal course of its business operations to the
impact of market fluctuations in the price of natural gas and oil.  Market risk
refers to the risk of loss in cash flows and future earnings arising from
adverse changes in commodity energy prices. The Company's primary exposure
arises from fixed price purchase or sale agreements which extend for periods of
up to 48 months, gas in storage inventories utilized by the gas marketing
operation, and anticipated sales of oil and gas production.  To a lessor extent,
the Company is exposed to risk of changing prices or the cost of intervening
transportation resulting from purchasing gas at one location and selling it at
another (hereinafter referred to as basis risk).  To minimize the risk from
market fluctuations in the price of natural gas and oil, the Company uses
commodity derivative instruments such as future contracts, swaps and options to
hedge existing or anticipated purchase and sale agreements, existing physical
gas in storage, and basis risk (See Note G to the Consolidated Financial
Statements.). None of these derivatives are held for speculative purposes.  The
Company adheres to policies and procedures which limit its exposure to market
risk from open positions and monitors its exposure to market risk.  The results
of the Company's derivative hedging activities continue to meet its stated
objective.

All of the Company's long-term debt is fixed-rate and, therefore, does not
expose the Company to the risk of earnings or cash flow loss due to changes in
market interest rates.  Such debt is not traded in the open market and,
accordingly, changes in its fair value due to changes in interest rates will
have no impact on future earnings or cash flows.

Kansas Gas Service began using derivative instruments to hedge the cost of
anticipated gas purchases during the winter heating months to protect its
customers from upward volatility in the market price of natural gas.  The gain
or loss resulting from such derivatives will be combined with the physical cost
of gas and recovered from the customer through the gas purchase clause in rates.
The Company has no market risk associated with such activities and, accordingly,
these derivatives have been omitted from the value-at-risk disclosures below.

VALUE-AT-RISK DISCLOSURE OF MARKET RISK- The estimation of potential losses that
could arise from changes in market conditions is typically accomplished through
the use of statistical models that seek to predict risk of loss based on
historical price and volatility patterns. The value-at-risk (VAR) measurement
used by the Company is based on J.P. Morgan's RiskMetrics/TM/ model, which
measures recent volatility and correlation in the price of natural gas and oil,
pulls through current price levels and net deltas, and applies estimates made by
management regarding the time required to liquidate positions and the degree of
confidence placed in the accuracy of the volatility and correlation estimates .
The Company's VAR calculation presents a comprehensive market risk disclosure by
combining its commodity derivative portfolio used to hedge price and basis risk
together with the current portfolio of firm physical purchase and sale contracts
and nonregulated gas-in-storage inventory. At August 31, 1998, the Company's
estimated potential one-day favorable or unfavorable impact on future earnings,
as measured by the VAR, using a 95 percent confidence level,

                                       31
<PAGE>
 
diversified correlation and assuming three days to liquidate positions is
immaterial.

The Company's calculated VAR exposure represents an estimate of potential losses
that would be recognized for its portfolio of derivative financial instruments
and firm physical contracts and nonregulated gas-in-storage assuming
hypothetical movements in future market rates and are not necessarily indicative
of actual results that may occur.  It does not represent the maximum possible
loss nor any expected loss that may occur, because actual future gains and
losses will differ from those estimated, based on actual fluctuations in the
market rates, operating exposures, and the timing thereof, and changes in the
Company's portfolio of derivative financial instruments and firm physical
contracts.

                                       32
<PAGE>
 
ITEM 8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA MANAGEMENT'S
          RESPONSIBILITY FOR FINANCIAL REPORTING

The management of ONEOK, Inc. is responsible for all information included in the
Annual Report whether audited or unaudited.  The financial statements have been
prepared in accordance with generally accepted accounting principles, applied in
a consistent manner, and necessarily included some amounts that are based on the
best estimates and judgements of management.

Management maintains a system of internal accounting policies, procedures, and
controls designed to provide reasonable assurance that assets are safeguarded
against loss or unauthorized use and that the financial records are reliable for
preparing financial statements.  ONEOK, Inc. maintains an internal auditing
staff responsible for evaluating the adequacy and application of financial and
operating controls and for testing compliance with management's policies and
procedures.

The accompanying consolidated financial statements of ONEOK, Inc. and
subsidiaries as of August 31, 1998 and 1997, and for each of the years in the
three-year period ended August 31, 1998, have been audited by KPMG Peat Marwick
LLP, independent certified public accountants.  Their audits include reviews of
the system of internal controls to the extent considered necessary to determine
the audit procedures required to support their opinion on the consolidated
financial statements.  The Independent Auditors' Report appears herein.

The Board of Directors performs its oversight role for reviewing the accounting
and auditing procedures and financial reporting of ONEOK, Inc. through its Audit
Committee.  Both KPMG Peat Marwick LLP and the Company's internal auditors have
free access to the Committee, without the presence of management, to discuss
accounting, auditing, and financial reporting matters.

                                       33
<PAGE>
 
                          INDEPENDENT AUDITORS' REPORT

To the Board of Directors and Shareholders
ONEOK, Inc.:

We have audited the accompanying consolidated balance sheets of ONEOK, Inc. and
subsidiaries as of August 31, 1998 and 1997, and the related consolidated
statements of income, shareholders' equity, and cash flows for each of the years
in the three-year period ended August 31, 1998.  These consolidated financial
statements are the responsibility of the Company's management.  Our
responsibility is to express an opinion on these consolidated financial
statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the financial position of ONEOK, Inc. and
subsidiaries as of August 31, 1998 and 1997, and the results of their operations
and cash flows for each of the years in the three-year period ended August 31,
1998, in conformity with generally accepted accounting principles.



                                    KPMG Peat Marwick LLP


Tulsa, Oklahoma
September 18, 1998

                                       34
<PAGE>
 
ONEOK, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF INCOME

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------
                                                       1998        1997        1996
- --------------------------------------------------------------------------------------
(Thousands of Dollars, except per share amounts)
 
Operating Revenues
<S>                                                 <C>         <C>         <C>
  Regulated                                         $  971,905  $  598,390  $  538,169
  Nonregulated
    Marketing                                          746,800     459,574     598,300
    Processing                                          79,097      71,617      58,395
    Production                                          31,874      27,185      25,479
    Other                                                5,726       5,161       4,002
- --------------------------------------------------------------------------------------
    Total Nonregulated                                 863,497     563,537     686,176
- --------------------------------------------------------------------------------------
      Total Operating Revenues                       1,835,402   1,161,927   1,224,345
- --------------------------------------------------------------------------------------
Operating Expenses
  Cost of gas                                        1,220,009     725,960     807,694
  Operations and maintenance                           277,068     210,852     201,644
  Depreciation, depletion, and amortization            101,653      74,509      72,868
  General taxes                                         33,217      22,491      21,489
  Income taxes                                          66,585      34,839      33,037
- --------------------------------------------------------------------------------------
      Total Operating Expenses                       1,698,532   1,068,651   1,136,732
- --------------------------------------------------------------------------------------
      Income before Interest                           136,870      93,276      87,613
- --------------------------------------------------------------------------------------
Interest
  Interest on long-term debt                            30,846      31,354      31,748
  Other interest                                         3,723       2,136       2,499
  Amortization of debt expense                             506         518         530
- --------------------------------------------------------------------------------------
     Net Interest                                       35,075      34,008      34,777
- --------------------------------------------------------------------------------------
Net Income                                             101,795      59,268      52,836
Preferred Stock Dividends                               26,979         285         428
- --------------------------------------------------------------------------------------
     Income Available for Common Stock              $   74,816  $   58,983  $   52,408
======================================================================================
Earnings Per Share of Common Stock -  Basic         $     2.44  $     2.13  $     1.93
======================================================================================
Earnings Per Share of Common Stock - Diluted        $     2.23  $     2.13  $     1.93
======================================================================================
</TABLE>



See accompanying notes to consolidated financial statements.

                                       35
<PAGE>
 
ONEOK, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
 
- ----------------------------------------------------------------------------------
August 31,                                                     1998        1997
- ----------------------------------------------------------------------------------
(Thousands of Dollars)
 
Assets
Property, Plant, and Equipment
<S>                                                         <C>         <C>
    Distribution system                                     $1,527,754  $  794,208
    Transmission system                                        577,927     310,231
    Gas storage                                                 69,059      55,157
    Oil and gas production                                     327,970     166,337
    Gas processing                                              74,451      86,075
    Other                                                       24,769      17,485
- ----------------------------------------------------------------------------------
       Total Property, Plant and Equipment                   2,601,930  $1,429,493
   Accumulated depreciation, depletion, and amortization       915,769     586,156
- ----------------------------------------------------------------------------------
     Net Property                                            1,686,161     843,337
- ----------------------------------------------------------------------------------
Current Assets:
   Cash and cash equivalents                                        86      14,377
   Trade accounts and notes receivable                         177,649     100,937
   Materials and supplies                                       10,046       4,303
   Gas in storage                                              128,334      74,027
   Advance payments for gas                                      3,619       3,700
   Deferred income taxes                                        10,094           -
   Purchased gas cost adjustment                                     -       1,138
   Other current assets                                          8,245       8,795
- ----------------------------------------------------------------------------------
     Total Current Assets                                      338,073     207,277
- ----------------------------------------------------------------------------------
Deferred Charges and Other Assets:
   Investments                                                  10,505         324
   Regulatory assets, net                                      229,543     144,712
   Goodwill                                                     77,422       4,756
   Other                                                        80,783      37,001
- ----------------------------------------------------------------------------------
     Total Deferred Charges and Other Assets                   398,253     186,793
- ----------------------------------------------------------------------------------
     Total Assets                                           $2,422,487  $1,237,407
==================================================================================
</TABLE>

See accompanying notes to consolidated financial statements.

                                       36
<PAGE>
 
ONEOK, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
August 31,                                                                           1998        1997
- --------------------------------------------------------------------------------------------------------
(Thousands of Dollars)
<S>                                                                               <C>         <C>
 
Liabilities and Shareholders' Equity
Common Shareholder's Equity:
   Common stock with $0.01 par value: authorized 100,000,000 shares;
     issued and outstanding 31,576,287 shares at August 31, 1998
     and 28,079,783 shares at August 31, 1997                                     $      316  $      281
   Premium on common stock                                                           329,425     229,522
   Retained earnings                                                                 270,808     232,823
- --------------------------------------------------------------------------------------------------------
     Total Common Shareholders' Equity                                               600,549     462,626
Convertible preferred stock: $0.01 par value, Series A, authorized 100,000,000
     shares; issued and outstanding 19,946,448 shares at August 31, 1998                 199           -
Convertible preferred stock: $0.01 par value; Series B, authorized 30,000,000
     shares; issued and outstanding 83,826 shares at August 31, 1998                       1           -
Premium on preferred stock                                                           568,122           -
- --------------------------------------------------------------------------------------------------------
     Total Shareholders' Equity                                                    1,168,871     462,626
- --------------------------------------------------------------------------------------------------------
Long-term debt                                                                       312,355     328,214
Current Liabilities:
   Current maturities of long-term debt                                               16,909      18,909
   Notes payable                                                                     212,000      45,000
   Accounts payable                                                                  136,601      80,155
   Dividends payable                                                                   9,007           -
   Accrued taxes                                                                      16,829      12,996
   Accrued interest                                                                    7,814       7,376
   Customers' deposits                                                                17,042       6,218
   Deferred income taxes                                                                   -         694
   Purchased gas cost adjustment                                                      12,168           -
   Other                                                                              32,443      17,699
- --------------------------------------------------------------------------------------------------------
     Total Current Liabilities                                                       460,813     189,047
- --------------------------------------------------------------------------------------------------------
Deferred Credits and Other Liabilities
   Deferred income taxes                                                             313,955     183,991
   Customers' advances for construction
     and other deferred credits                                                      166,493      73,529
- --------------------------------------------------------------------------------------------------------
     Total Deferred Credits                                                          480,448     257,520
- --------------------------------------------------------------------------------------------------------
Commitments and Contingencies
- --------------------------------------------------------------------------------------------------------
     Total Liabilities and Shareholders' Equity                                   $2,422,487  $1,237,407
========================================================================================================
</TABLE>

See accompanying notes to consolidated financial statements.

                                       37
<PAGE>
 
ONEOK, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------
August 31,                                                     1998       1997       1996
- -------------------------------------------------------------------------------------------
(Thousands of Dollars)
 
Operating Activities
<S>                                                         <C>         <C>        <C>
  Net income                                                $ 101,795   $ 59,268   $ 52,836
  Depreciation, depletion, and amortization                   101,653     74,509     72,868
  Net losses of equity investees                                    -        257        173
  Deferred income taxes                                        (7,623)    (2,988)    (2,038)
  Other                                                       (17,221)         -     (5,675)
  Changes in assets and liabilities
    (Increase) decrease in accounts and notes receivable       53,400     18,401    (37,570)
    (Increase) decrease in inventories                          1,232     13,226     (9,433)
    (Increase) decrease in other assets                        13,472    (10,096)     8,027
    Decrease in regulatory assets                                   -        384      1,431
    Increase (decrease) in accounts payable and
       accrued liabilities                                     51,957    (14,897)    33,532
    Changes in purchased gas cost adjustment                   54,257     10,539    (14,383)
    Increase (decrease) in deferred credits
      and other liabilities                                    (6,396)     3,448      5,282
- -------------------------------------------------------------------------------------------
        Cash Provided by Operating Activities                 346,526    152,051    105,050
- -------------------------------------------------------------------------------------------
Investing Activities
  Changes in other investments, net                            (3,778)     1,698          -
  Acquisitions, net                                           (24,421)         -          -
  Capital expenditures, net of salvage                       (301,515)   (90,530)   (89,582)
  Proceeds from sale of property                               30,000          -     17,597
- -------------------------------------------------------------------------------------------
      Cash Used in Investing Activities                      (299,714)   (88,832)   (71,985)
- -------------------------------------------------------------------------------------------
Financing Activities
  Issuance (payment) of notes payable, net                      5,302     (5,230)    (5,052)
  Payment of debt                                             (17,859)   (14,000)   (12,000)
  Issuance of common stock                                      6,257      7,363          -
  Dividends paid                                              (54,803)   (28,033)   (27,914)
  Redemption of preferred stock                                     -     (9,540)         -
- -------------------------------------------------------------------------------------------
      Cash Used in Financing Activities                       (61,103)   (49,440)   (44,966)
- -------------------------------------------------------------------------------------------
Change in Cash and Cash Equivalents                           (14,291)    13,779    (11,901)
Cash and Cash Equivalents at Beginning of Year                 14,377        598     12,499
- -------------------------------------------------------------------------------------------
Cash and Cash Equivalents at End of Year                    $      86   $ 14,377   $    598
===========================================================================================
</TABLE>


See accompanying notes to consolidated financial statements.

                                       38
<PAGE>
 
ONEOK, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY

<TABLE>
<CAPTION>
                                                           Common Shareholders' Equity
                                                  -------------------------------------------
                                                    Common   Premium on   Retained              Preferred
                                                    Stock   Common Stock  Earnings     Total      Stock
- ---------------------------------------------------------------------------------------------------------
(Thousands of Dollars)
<S>                                                 <C>     <C>           <C>        <C>        <C>
 
Balance at September 1, 1995                          $270      $201,134  $187,225   $388,629    $  9,000
  Net income                                             -             -    52,836     52,836           -
  Issuance of common stock                               2         5,678         -      5,680           -
  Preferred stock dividends -
    $2.375 per share                                     -             -      (428)      (428)          -
  Common stock dividends -
    $1.18 per share                                      -             -   (32,022)   (32,022)          -
- ---------------------------------------------------------------------------------------------------------
Balance at August 31, 1996                            $272      $206,812  $207,611   $414,695    $  9,000
=========================================================================================================
 
Balance at September 1, 1996                          $272      $206,812  $207,611   $414,695    $  9,000
  Net income                                             -             -    59,268     59,268           -
  Issuance of common stock                               9        22,710         -     22,719           -
  Preferred stock dividends -
    $2.375 per share                                     -             -      (321)      (321)          -
  Redemption of Series A Preferred Stock                                      (540)      (540)     (9,000)
  Common stock dividends -                                             -
    $1.20 per share                                      -                 (33,195)   (33,195)          -
- ---------------------------------------------------------------------------------------------------------
Balance at August 31, 1997                            $281      $229,522  $232,823   $462,626           -
=========================================================================================================
 
BALANCE AT SEPTEMBER 1, 1997                          $281      $229,522  $232,823   $462,626           -
  NET INCOME                                             -             -   101,795    101,795           -
  ISSUANCE OF COMMON STOCK
     ACQUISITIONS                                       33        93,648               93,681
     STOCK PURCHASE PLANS                                2         6,255                6,257
  CONVERTIBLE PREFERRED STOCK DIVIDENDS -
    $1.80 AND $1.50 PER SHARE FOR
    FOR SERIES A AND B, RESPECTIVELY                     -             -   (26,979)   (26,979)          -
  ISSUANCE OF SERIES A AND SERIES B
    CONVERTIBLE PREFERRED STOCK                          -             -         -          -     568,322
 
  COMMON STOCK DIVIDENDS -
    $1.20 PER SHARE                                      -             -   (36,831)   (36,831)          -
- ---------------------------------------------------------------------------------------------------------
BALANCE AT AUGUST 31, 1998                            $316      $329,425  $270,808   $600,549    $568,322
=========================================================================================================
</TABLE>

See accompanying notes to consolidated financial statements.

                                       39
<PAGE>
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(A)  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION - ONEOK, Inc., formerly WAI, Inc. (New ONEOK) is successor
by merger of ONEOK Inc. (Old ONEOK) with and into WAI, Inc. New ONEOK acquired
the gas business of Western Resources, Inc. (Western) and merged with Old ONEOK
on November 26, 1997. The transaction was effective November 30, 1997, for
financial reporting purposes. See Note B of Notes to Consolidated Financial
Statements on page 42.

NATURE OF OPERATIONS - ONEOK, Inc. and subsidiaries (collectively, the Company)
is a diversified energy company engaged in the production, gathering, storage,
transportation, distribution, and marketing of environmentally clean fuels and
products.  The Company's business units are characterized as operating within
either a rate regulated environment (regulated operations) or a nonregulated
environment (nonregulated operations).  The regulated business units provided
natural gas distribution and transmission to approximately 80 percent of
Oklahoma and 67 percent of Kansas and generated approximately 72 percent of
income before interest and income taxes during 1998.  The nonregulated business
has segments involved in various aspects of natural gas marketing, gathering and
processing, and production. The Company's other segment, whose results of
operations are not material, operates and leases the Company's headquarters
building and parking facility.

CONSOLIDATION -  The consolidated financial statements include the accounts of
ONEOK, Inc. and its wholly-owned subsidiaries. All significant intercompany
accounts and transactions have been eliminated in consolidation. Investments in
twenty percent to 50 percent-owned affiliates are accounted for on the equity
method. Investments in less than twenty percent owned affiliates are accounted
for on the cost method.

REGULATION -  The regulated operations of the Company are primarily subject to
the rate regulation and accounting requirements of the Oklahoma Corporation
Commission (OCC) and of the Kansas Corporation Commission (KCC). Certain other
regulated activities of the Company are subject to regulation by the Federal
Energy Regulatory Commission (FERC).  Accordingly, the regulated operations
follow the accounting and reporting guidance contained in Statement of Financial
Accounting Standards No. 71, "Accounting for the Effects of Certain Types of
Regulation." Allocation of costs and revenues to accounting periods for
ratemaking and regulatory purposes may differ from bases generally applied by
nonregulated companies. Such allocations to meet regulatory accounting
requirements are considered to be generally accepted accounting principles for
regulated utilities provided that there is a demonstrable ability to recover any
deferred costs in future rates.

The OCC issued an interim order on July 31, 1998, for ONG to proceed with a
competitive bidding process to obtain some of the upstream services, such as
supply, transportation, and storage, necessary to serve the Oklahoma City and
Tulsa markets. The order outlines how ONG is to proceed with upstream
unbundling. While the Company supports the concept of unbundling, it believes
the order contains elements that are an "invasion of internal management
discretion" and has filed an appeal with the Oklahoma Supreme Court.

During the rate-making process, regulatory commissions may require a utility to
defer recognition of certain costs to be recovered through rates over time as
opposed to expensing such costs as incurred. This allows the utility to
stabilize rates over time rather than passing such costs on to the customer for
immediate recovery. This causes certain expenses to be deferred as a regulatory
asset and amortized to expense as it is recovered through rates. Total
regulatory assets resulting from this deferral process are approximately $230
million and $145 million at August 31, 1998 and 1997 respectively. See Note D of
Notes to Consolidated Financial Statements on page 45.

REVENUE RECOGNITION - The Company recognizes revenue when services are rendered
or product is delivered.  Major industrial and commercial gas distribution
customers are invoiced as of the end of each month.  Certain gas distribution
customers, primarily residential and some commercial, are invoiced on a cycle
basis throughout the month, and the Company accrues unbilled revenues at the end
of each month.  Beginning in 1996, Oklahoma Natural Gas Company's (ONG's) tariff
rates for residential and commercial customers contained a temperature
normalization clause that provided for billing adjustments from actual volumes
to normalized volumes during the winter heating season. Revenues from marketing,
gathering and processing and production are recognized on the sales method.
Credit is granted to these customers under customary terms.

                                       40
<PAGE>
 
REGULATED PROPERTY - Regulated distribution, transportation, and storage
property is stated at cost. Such cost includes personnel costs, general and
administrative costs, and allowance for funds used during construction. The
allowance for funds used during construction represents the capitalization of
estimated average cost of borrowed funds (8.6 percent, 8.6 percent, and 8.5
percent, in 1998, 1997, and 1996, respectively) used during the construction of
major projects and is recorded as a credit to earnings.

Depreciation is calculated using the straight-line method based upon rates
prescribed for ratemaking purposes.  The average depreciation rate for OCC
regulated property approximated 3.7 percent in 1998, 3.7 percent in 1997, and
3.6 percent in 1996. The average depreciation rates for KCC regulated properties
in Kansas and Oklahoma were approximately 3.3 percent, and 3.7 percent,
respectively, in 1998. The average depreciation rates for Mid Continent Market
Center (MCMC) properties was 3.4 percent in 1998.

Maintenance and repairs are charged directly to expense. Generally, the cost of
property retired or sold, plus removal costs, less salvage, is charged to
accumulated depreciation. Gains and losses from sales or transfers of operating
units or systems are recognized in income.

- -------------------------------------------
                         REMAINING  SERVICE
                           LIFE     (YEARS)
===================================--------
Distribution property        22-25       40
Gathering property            5-33       47
Storage property              5-19       40
Transmission property        18-33       47
Other property                6-24       40
- -------------------------------------------

PRODUCTION PROPERTY - The Company uses the successful-efforts method to account
for costs incurred in the acquisition and exploration of oil and natural gas
reserves. Costs to acquire mineral interests in proved reserves and to drill and
equip development wells are capitalized. Geological and geophysical costs and
costs to drill exploratory wells which do not find proved reserves are expensed.
Unproved oil and gas properties which are individually significant are
periodically assessed for impairment. The remaining unproved oil and gas
properties are aggregated, and an overall impairment allowance is provided based
on the Company's experience.

Depreciation and depletion are calculated using the unit-of-production method
based upon periodic estimates of proven oil and gas reserves. Undeveloped
properties are amortized based upon remaining lease terms and exploratory and
developmental drilling experience.

OTHER PROPERTY - Gas processing plants and all other properties are stated at
cost. Gas processing plants are depreciated using various rates based on
estimated lives of available gas reserves. All other property and equipment is
depreciated using the straight-line method over its estimated useful life.

INVENTORIES - Materials and supplies are priced at average cost.  Noncurrent gas
in storage is classified as property and is priced at cost.  Cost of current gas
in storage in Oklahoma is determined under the last-in, first-out, (lifo) and
first-in, first-out (fifo) methodology by the regulated and nonregulated
operations, respectively. The estimated replacement cost of current gas in
storage valued under the lifo method was $73.6 million and $63.7 million at
August 31, 1998 and 1997, respectively. The estimated replacement cost of
current gas in storage in Kansas is $33.9 million. Cost of current gas in
storage for Kansas is determined using the weighted average cost of gas method.

INCOME TAXES - Deferred income taxes are recognized for the tax consequences of
"temporary differences" by applying enacted statutory tax rates applicable to
future years to differences between the financial statement carrying amounts and
the tax bases of existing assets and liabilities.  The effect on deferred taxes
of a change in tax rates is deferred and amortized for the OCC regulated
operations and, for nonregulated operations, is recognized in income in the
period that includes the enactment date. The Company continues to amortize
previously deferred investment tax credits on gas distribution and transmission
properties over the period prescribed by the OCC and KCC for ratemaking
purposes.

COMMODITY PRICE RISK MANAGEMENT - To minimize the risk from market fluctuations
in the price of natural gas and oil, the Company enters into futures
transactions, swaps, and options in order to hedge certain natural gas in
storage, existing physical gas purchases or sales commitments, as well as
anticipated sales of natural gas production.  In order to qualify as a hedge,
the price movements in the underlying commodity derivatives must be sufficiently
correlated with the hedged transaction.  Changes in the market value of these
financial instruments utilized as hedges are (1) recognized as an adjustment of
the carrying value in the case of existing assets and liabilities, (2) included
in the measurement of the transaction that satisfies the commitment in the case
of existing commitments, and (3) included in the measurement 

                                       41
<PAGE>
 
of the subsequent transaction in the case of anticipated transactions. In cases
where anticipated transactions do not occur, deferred gains and losses are
recognized when such transactions were scheduled to occur. Some of these
financial instruments carry off-balance sheet risks. See Note C of Notes to
Consolidated Financial Statements on page 43.

IMPAIRMENTS - The Company accounts for the impairment of long-lived assets to be
recognized when indicators of impairment are present and the undiscounted cash
flows are not sufficient to recover the assets carrying amount.  The impairment
loss is measured by comparing the fair value of the asset to its carrying
amount.  Fair values are based on discounted future cash flows or information
provided by sales and purchases of similar assets.  The Company evaluates
impairment of production assets on the lowest possible level, (a field by field
basis) rather than using a total company basis for its proved properties.
Primarily due to downward reserve revisions for certain proven properties, the
Company recognized a pre-tax impairment loss of $8.6 million in 1996, which is
included in depreciation, depletion and amortization expense.

USE OF ESTIMATES - Management has made a number of estimates and assumptions
relating to reporting of assets and liabilities and the disclosure of contingent
assets and liabilities to prepare these financial statements in conformity with
generally accepted accounting principles. Actual results could differ from these
estimates.

GOODWILL - The Company amortizes goodwill, which represents the excess of the
purchase price over the fair value of net assets acquired, over a period of 40
years.  The Company assesses the recoverability of this intangible asset by
determining whether the amortization of the goodwill balance over its remaining
life can be recovered through undiscounted future operating cash flows of the
acquired operation.

EARNINGS PER COMMON SHARE - In 1998, the Company adopted the provisions of
Statement of Financial Accounting Standards (SFAS) No, 128, Earnings Per Share.
Basic earnings per share are calculated based on the weighted average number of
shares of common stock outstanding during the period. Diluted earnings per share
are calculated based on the weighted average number of shares of common stock
outstanding plus potentially dilutive securities. All prior periods have been
restated to reflect this method of calculation.

ENVIRONMENTAL EXPENDITURES - The Company accrues for losses associated with
environmental remediation obligations when such losses are probable and
reasonably estimatable.  Accruals for estimated losses from environmental
remediation obligations generally are recognized no later than completion of the
remedial feasibility study. Such accruals are adjusted as further information
develops or circumstances change. Recoveries of environmental remediation costs
from other parties are recorded as assets when their receipt is deemed probable.

CASH AND CASH EQUIVALENTS - Cash equivalents consist of highly liquid
investments, which are readily convertible into cash and have original
maturities of three months or less.

COMMON STOCK OPTIONS AND AWARDS -The Company adopted SFAS No. 123, "Accounting
for Stock-Based Compensation" which permits, but does not require, a fair value
based method of accounting for stock-based employee compensation.
Alternatively, SFAS No. 123 allows companies to continue applying the provisions
of Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to
Employees" ("APB 25"), however, such companies are required to disclose pro
forma net income and earnings per share as if the fair value based method had
been applied. The Company has elected to continue to apply the provisions of APB
25 for purposes of computing compensation expense and has provided the pro forma
disclosure provisions of SFAS No. 123 in Note N of Notes to Consolidated
Financial Statements on page 53.

RECLASSIFICATION.  Certain amounts in the 1997 consolidated financial statements
have been reclassified to conform with the 1998 presentation.

(B) ACQUISITIONS

On November 26, 1997, Old ONEOK acquired from Western all of the assets of
Western that were primarily used in, or primarily related to or primarily
generated by, the field operations of the local natural gas distribution
business of Western, and all of the outstanding capital stock of Western's
directly or indirectly wholly-owned subsidiaries, Westar Gas Marketing, Inc. and
MCMC, and assumed (i) all of the liabilities of Western that arose primarily out
of or related 

                                       42
<PAGE>
 
primarily to or were primarily generated by gas business and (ii) approximately
$161 million in aggregate principal amount of debt of Western; and Old ONEOK
merged (the "Merger") with an into New ONEOK, with New ONEOK as the surviving
corporation. The shares of Old ONEOK common stock were converted on a one-for-
one basis into shares of stock of New ONEOK, and Western received 2,996,702
shares of the Company's Common Stock and 19,317,584 shares of the Company's
Series A Convertible Preferred Stock. Such shares and additional shares
purchased by Western at the closing of the transaction represented in the
aggregate 9.9 percent of the outstanding Common Stock or 45 percent of the
Capital Stock of the Company. A shareholder agreement, which includes standstill
provisions, prevents Western from increasing its position in the Company above a
common stock interest of 45 percent on a fully converted basis and maintains
control of the Company in the hands of the public shareholders of the Company.

The acquisition was accounted for as a purchase and,  accordingly, the operating
results of the properties acquired from Western are included in the consolidated
financial statements since December 1, 1997.  The aggregate purchase price was
approximately $824 million, including debt assumed and transaction costs.  The
aggregate purchase price, which was funded through the issuance of a combination
of preferred and common stock, was allocated based on the estimated fair value
of the net assets. The excess of the purchase price over the fair value of the
net assets acquired approximated $74 million and is being amortized over 40
years.

The Company acquired Washita Production Company, a Tulsa based independent oil
and gas producer, in December 1997.  For financial statement purposes the
transaction was accounted for as a purchase and, accordingly, the operating
results of Washita are included in the consolidated financial statements since
the date of acquisition. The aggregate purchase price of $20 million was made
with a combination of the Company's common stock and cash.

In June 1998, the Company acquired a 40 percent equity interest in K. Stewart
Petroleum Corp. increasing the Company's interest in oil and gas reserves
located in the Anadarko Basin. The $6.0 million acquisition was made with a
combination of the Company's common stock and cash.

The table of unaudited pro forma information presents a summary of consolidated
results of operations of the Company as if the acquisition of the gas business
from Western had occurred at the beginning of fiscal 1997. These results do not
necessarily reflect the results which would have been obtained if the merger had
actually occurred on the dates indicated or the results which may be expected in
the future.

 
- ----------------------------------------------------------------------
(THOUSANDS OF DOLLARS                                 PRO FORMA
                                              ------------------------
EXCEPT PER SHARE AMOUNTS)                          1998        1997
- ----------------------------------------------------------------------
Total operating revenues                        $2,034,640  $2,011,134
Income before interest and income taxes         $  207,281  $  183,202
Net income                                      $  104,185  $   86,310
Preferred stock dividends                       $   35,955  $   35,955
Income available for common stock               $   68,230  $   50,355
Earnings per share of common stock - basic      $     2.17  $     1.64
Earnings per share of common stock - diluted    $     2.03  $     1.64
- ----------------------------------------------------------------------

(C)    FINANCIAL INSTRUMENTS AND RISK MANAGEMENT

FINANCIAL INSTRUMENTS - The following table presents the carrying amounts and
fair values of certain of the Company's financial instruments. Fair value is
defined as the amount at which the instrument could be exchanged in a current
transaction between willing parties. The estimated fair value of long-term debt
and notes payable has been determined using quoted market prices of same or
similar issues, discounted cash flows, and/or rates currently available to the
Company for debt with similar terms and remaining maturities. The fair value of
natural gas and oil swaps, options, and futures contracts generally reflect the
estimated amounts that the Company would pay or receive to terminate the
contracts at the reporting date, thereby taking into account the unrealized
gains and losses on open contracts. There is no readily available market for
natural gas swaps. The items presented without a carrying value are off-balance
sheet financial instruments. All of the Company's financial instruments are held
for purposes other than trading.
 

                                       43
<PAGE>
 
- --------------------------------------------------------
                                             Approximate
(Thousands of Dollars)           Book Value   Fair Value
- --------------------------------------------------------
AUGUST 31, 1998
Cash and cash equivalents          $     86     $     86
Accounts and notes receivable      $177,139     $177,139
Natural gas swaps                         -     $    750
Natural gas options                       -     $  3,486
Natural gas futures                       -     $  9,971
Notes payable                      $212,000     $212,000
Long-term debt                     $329,264     $358,207
- --------------------------------------------------------
 
August 31, 1997
Cash and cash equivalents          $ 14,377     $ 14,377
Accounts and notes receivable      $100,937     $100,937
Natural gas swaps                         -     $  3,809
Natural gas options                       -        ($273)
Natural gas futures                       -      ($1,700)
Notes payable                      $ 45,000     $ 45,000
Long-term debt                     $347,123     $379,141
- --------------------------------------------------------



RISK MANAGEMENT - The Company's gas marketing, gathering and processing, and
production operations subject the Company's earnings to variability based on
fluctuations in both the market price and transportation costs of natural gas
and oil.  The Company's exposure arises from fixed price purchase or sale
agreements which extend for periods of up to 48 months, certain gas storage
inventories, and anticipated sales of oil and gas production.  In order to
mitigate the financial risks associated with such activities, the Company
routinely enters into natural gas and oil futures contracts, swaps, and options,
collectively referred to herein as derivatives.  Net open positions in terms of
price, volume, and specified delivery point do occur.

The futures contracts are purchased and sold on the New York Mercantile Exchange
(NYMEX) or the Kansas City Board of Trade (KCBOT) and require the Company to buy
or sell natural gas at a fixed price.  Swap agreements generally require one
party to make payments based on the difference between a fixed price or fixed
differential from the NYMEX or KCBOT price while the other party pays a price
based on a published index.  Swaps and options allow the Company to commit to
purchase gas at one location and sell it at another location without assuming
unacceptable risk with respect to changes in the price of gas or the cost of the
intervening transportation.  Natural gas options held to hedge price risk
provide the right, but not the requirement, to buy or sell natural gas at a
fixed price.  The Company utilizes options to limit overall price risk exposure.
None of these derivatives are held for speculative purposes and, in general, the
Company's risk management policy requires that positions taken with derivatives
be offset by positions in physical transactions or other derivatives.

The notional value of futures contracts purchased and sold is $7.6 million and
$82.5 million, respectively, at August 31, 1998.  The term "notional amount"
refers to the current contract unit price times the contract volume for the
relevant derivative.  In general, such amounts are not indicative of the cash
requirements associated with these derivatives.  The notional amount is intended
to be indicative of the Company's level of activity in such derivatives,
although the amounts at risk are significantly smaller because, in general,
changes in market value of these derivatives are offset by changes in the value
associated with the underlying physical transaction or other derivatives.


- -----------------------------------------------------------
(VOLUMES IN MMCF,                            ESTIMATED FAIR
THOUSANDS OF DOLLARS)     VOLUMES   VOLUMES   MARKET VALUE
AUGUST 31, 1998          PURCHASED   SOLD    GAIN (LOSS) (A)
- -----------------------------------------------------------
OPTIONS                      4,543    2,536        $  3,486
SWAPS                       49,281   44,715        $    750
FUTURES                      5,375   35,492        $  9,971
- -----------------------------------------------------------
August 31, 1997
- -----------------------------------------------------------
Options                      2,000   11,960           ($273)
Swaps                       72,414   62,908        $  3,809
Futures                     30,420   32,010         ($1,700)
- -----------------------------------------------------------

                                      44
<PAGE>
 
(A) represents the estimated amount which would have been recognized upon
termination of the relevant derivatives as of the date indicated.  The amount
which is ultimately charged or credited to earnings is affected by subsequent
changes in the market value of these derivatives.

NYMEX- and KCBOT-traded futures and option contracts are guaranteed by NYMEX and
KCBOT and have nominal credit risk.  All other derivative transactions expose
the Company to off-balance sheet risk in the event of non performance by the
counterparts.  In order to minimize this risk, the Company analyzes each
counterpart's financial condition prior to entering into an agreement,
establishes credit limits, and monitors the appropriateness of these limits on
an on-going basis.  Swap agreements are generally settled at the expiration of
the contract term and may be subject to margin requirements with the
counterparty.  NYMEX- and KCBOT-traded futures and options contracts require
daily cash settlement in margin accounts with brokers.


(D)  REGULATORY ASSETS

The table presents a summary of regulatory assets, net of amortization,
outstanding at August 31, 1998, and August 31, 1997.

- -------------------------------------------------------------
AUGUST 31,                                   1998      1997
(Thousands of Dollars)
- -------------------------------------------------------------
 
Recoupable take-or-pay                     $ 90,708  $ 95,482
Pension costs                                25,061    29,244
Postretirement costs other than pension      59,963     8,836
Other                                         8,917     3,327
Transition costs                             18,447         -
Income taxes                                 26,447     7,823
    Regulatory Assets, Net                 $229,543   144,712
=============================================================

Certain of the regulatory assets including a portion of Kansas Gas Service net
deferred  income taxes and the assets listed in the table below, are being
recovered through rates, but the Company is not being allowed to earn a rate of
return on the unrecovered balance.  The remaining recovery period for these
assets is set forth in the table below.
 
- ----------------------------------------------------------------------------
                                                          REMAINING RECOVERY
                                                            PERIOD (MONTHS)
- ----------------------------------------------------------------------------
Postretirement costs other than pension - Oklahoma                 181
Income taxes - Oklahoma                                         154 - 170
Transition Costs                                                   480
- ----------------------------------------------------------------------------

No significant recoupable costs attributable to resolutions of take-or-pay and
pricing issues were incurred in 1998 or 1997.  The OCC has authorized recovery
of the take-or-pay settlement costs through a combination of a surcharge to
customers and revenues derived from certain transportation customers.

ONG's pension and postretirement benefit costs previously deferred are currently
being recovered through revenue and are being amortized to expense over a 10 to
18 year period.  As discussed in Note H, the OCC also approved recovery of
pension and postretirement costs through rates.

Kansas Gas Service has been deferring and recording postretirement benefits in
excess of pay-as-you-go as a regulatory asset.  See Note H of Notes to
Consolidated Financial Statements on page 47.

The KCC has allowed certain transition costs to be amortized and recovered in
rates over a forty year period with no rate of return on the unrecovered
balance.  Management believes that all transition costs recorded as a regulatory
asset will be recovered through rates based on the accounting orders received
and regulatory precedents established by the KCC.

In accordance with various rate orders received from the KCC and the OCC, Kansas
Gas Service has not yet collected through rates the amounts necessary to pay a
significant portion of the net deferred income tax liabilities.  As management
believes it is probable that the net future increases in income taxes payable
will be recovered from customers, it has recorded a regulatory asset for these
amounts.

                                      45
<PAGE>
 
Amortization expense related to regulatory assets was approximately $11.4
million, $10.1 million, and $11.7 million in 1998, 1997, and 1996, respectively.

(E)  CAPITAL STOCK

The Company has approximately 68 million shares of unrestricted common stock
available for issue.  The Company redeemed all of its outstanding shares of
Series A Preferred Stock, par value $50 per share, at its stated voluntary
liquidation value of $53 per share during the third quarter of fiscal 1997.  The
Company issued Series A Convertible Preferred Stock, par value $0.01 per share,
at the time of the alliance with Western.  The holders of Series A Convertible
Preferred Stock are entitled to receive a dividend payment, with respect to each
dividend period of the common stock, equal to 1.5 times the dividend amount
declared in respect of each share of common stock.  The terms of Series B
Convertible Preferred Stock are the same as Series A Convertible Preferred
Stock, except that  the dividend amount is equal to 1.25 times the common stock
dividend.  Series C Preferred Stock is designed to protect ONEOK, Inc.
shareholders from coercive or unfair takeover tactics.  Holders of Series C
Preferred Stock are entitled to receive, in preference to the holders of ONEOK
common stock, quarterly dividends in an amount per share equal to the greater of
$1 or subject to adjustment, 100 times the aggregate per share amount of all
cash dividends, and 100 times the aggregate per share amount of all non-cash
dividends.  No Series C Preferred Stock has been issued.

The Series A and Series B Convertible Preferred Stock is convertible, subject to
certain restrictions, at the option of the holder, into ONEOK, Inc., Common
Stock at the rate of one share for each share of Series A or Series B
Convertible Preferred Stock.

In connection with the merger transaction with WAI, Inc., the common stock of
Old ONEOK, no par value, was exchanged for the common stock of New ONEOK, $0.01
par value, on a one-for-one basis.  See Note B.  As a result of the share
exchange, all common share data has been adjusted retroactively in the
accompanying consolidated financial statements.

The Board of Directors has reserved 3.0 million shares of ONEOK, Inc's common
stock for the Direct Stock Purchase and Dividend Reinvestment Plan of which 142
thousand shares were issued in 1998 and 363 thousand shares were issued in 1997;
and has reserved approximately 3.6 million shares for the Thrift Plan for
Employees of ONEOK, Inc. and Subsidiaries, excluding Kansas Gas Service Company
(KGS) employees and 3.6 million shares for the Thrift Plan for Employees of KGS.

Under the most restrictive covenants of the Company's loan agreements, $243.1
million (89.9 percent) of retained earnings at August 31, 1998, was available to
pay dividends.

(F)  LINES OF CREDIT AND SHORT-TERM NOTES PAYABLE

At August 31, 1998, the Company had a short-term unsecured credit agreement with
several banks pursuant to which the banks have agreed to make loans to the
Company from time to time in an aggregate amount not to exceed $200 million at
any one time for general corporate purposes.  The short-term credit agreement
provides a back-up line of credit for short-term debt from other sources in
addition to providing short-term funds.  The facility fee requirement for this
line of credit is .06 percent applied annually to the total line of credit.
Borrowing under the agreement bears interest at offshore IBOR rates plus .19
percent per annum.  No compensating balance requirements existed at August 31,
1998. The Company also has additional credit facilities available through a
master note with Bank of America which provides an additional $30 million in
borrowing capability.  Maximum short-term debt from all sources as approved by
the Company's Board of Directors is $225 million.

Short-term notes payable totaling $212 million at August 31, 1998, and $45
million at August 31, 1997, were outstanding.  The notes carried average
interest rates of 5.83 percent and 5.84 percent, respectively.

                                      46
<PAGE>
 
(G)  LONG-TERM DEBT

All long-term notes payable at August 31, 1998, are unsecured.  The aggregate
current maturities of long-term debt for each of the five years ending August
31, 2003, are $16.9 million; $16.8 million; $15.4 million; $14.7 million; and
$14.7 million, respectively, including $1.1 million each year callable at the
option of the holder.
 
- ---------------------------------------------
AUGUST 31,                   1998      1997
(THOUSANDS OF DOLLARS)
- ---------------------------------------------
Long-term Notes Payable
5.90% due 1998             $      0  $ 10,000
6.20% due 1999                8,000     8,000
6.43% due 2000                5,000     5,000
6.75% due 2001                5,393     9,252
8.32% due 2007               36,000    40,000
8.44% due 2004               40,000    40,000
8.70% due 2021               34,871    34,871
9.70% due 2019              125,000   125,000
9.75% due 2020               75,000    75,000
- ---------------------------------------------
Total                      $329,264  $347,123
- ---------------------------------------------
 
Current maturities of
long-term debt               16,909    18,909
- ---------------------------------------------
Long-term notes payable    $312,355  $328,214
- ---------------------------------------------

(H)  EMPLOYEE BENEFITS PLANS

RETIREMENT PLANS - The Company has defined benefit retirement plans covering
substantially all employees.  Company officers and certain key employees are
also eligible to participate in supplemental retirement plans.

Net pension costs under the plans, as determined by an independent actuary,
consists of the following:
 
- ----------------------------------------------------------------
AUGUST 31,                          1998       1997       1996
(THOUSANDS OF DOLLARS)
- ----------------------------------------------------------------
Service cost                     $   7,221   $  5,126      5,957
Interest cost                       30,875     23,766   $ 23,525
Actual return on assets           (114,514)    (9,010)   (72,138)
Net amortization and deferral       75,684    (16,281)    50,337
- ----------------------------------------------------------------
Net pension cost (benefit)           ($734)  $  3,601   $  7,681
================================================================

The Company generally funds pension costs at a level equal to the minimum amount
required under the Employee Retirement Income Security Act of 1974.   The
accompanying table sets forth the funded status of the Company's plans, as
determined by the independent actuary.

- -------------------------------------------------------------------------------
AUGUST 31,                                                 1998         1997
(THOUSANDS OF DOLLARS)
- -------------------------------------------------------------------------------
Actuarial present value of vested benefit obligation     ($413,195)   ($277,266)
Accumulated benefit obligation                            (440,892)    (291,662)
Projected benefit obligation                              (500,327)    (326,539)
Plan assets at fair value, principally equity
  securities and an IPG fund                               595,308      326,384
- -------------------------------------------------------------------------------
Plan assets more (less) than projected
  benefit obligation                                        94,981         (155)
Unrecognized net loss (gain)                               (30,388)      15,308
Unrecognized prior service cost                                607          784
Unrecognized net asset                                      (2,805)      (3,272)
- -------------------------------------------------------------------------------
Prepaid pension cost                                    $   62,395   $   12,665
===============================================================================

                                      47
<PAGE>
 
The projected benefit obligation was determined using an annual discount rate of
6.75 percent for 1998 and 7.75 percent for 1997; a long-term return on plan
assets of 9 percent for both 1998 and 1997; and an average assumed long-term
annual rate of salary increases of 4 to 4.5 percent for 1998 and 4 percent for
1997.

OTHER POSTRETIREMENT BENEFIT PLANS - The Company sponsors welfare care plans
that provide postretirement medical benefits and life and accidental death and
dismemberment benefits to substantially all employees who retire under the
Retirement Plans at age 55 or older with at least five years of service.  The
plans are contributory, with retiree contributions adjusted periodically, and
contain other cost-sharing features such as deductibles and coinsurance.

The Company elected to delay recognition of the accumulated postretirement
benefit obligation (APBO) of approximately $72.2 million and amortize it over 20
years as a component of net periodic postretirement benefit cost.

Net periodic postretirement benefit cost includes the following components:
 
- ------------------------------------------------------------------------
AUGUST 31,                                     1998      1997     1997
(THOUSANDS OF DOLLARS)
- ------------------------------------------------------------------------
Service cost                                 $ 2,570   $ 1,744   $ 1,704
Interest cost                                  8,224     5,599     5,668
Actual return on assets                       (1,646)     (184)        -
Net amortization and deferral                  3,916     3,387     3,608
- ------------------------------------------------------------------------
Net periodic postretirement benefit  cost    $13,064   $10,546   $10,980
========================================================================

For measurement purposes, a 7.75 percent annual rate of increase in the per
capita cost of covered medical benefits (i.e., medical cost trend rate) was
assumed for 1998, the rate was assumed to decrease gradually to 5 percent by the
year 2003 and remain at that level thereafter.  The medical cost trend rate
assumption has a significant effect on the amounts reported.  For example,
increasing the assumed medical cost trend by one percentage point in each year
would increase the accumulated postretirement benefit obligation as of August
31, 1998, by $10.6 million and the aggregate of the service and interest cost
components of net periodic postretirement benefit cost for the year ended August
31, 1998, by $0.9 million.

The weighted average discount rate used in determining the accumulated
postretirement benefit obligation was 6.75 percent and 7.75 percent at August
31, 1998, and 1997 respectively.

The following table presents the plans' funded status as determined by the
independent actuary.
 
- ---------------------------------------------------------------------
AUGUST 31,                                          1998       1997
(THOUSANDS OF DOLLARS)
- ---------------------------------------------------------------------
Accumulated postretirement benefit obligation
  Retirees                                        ($90,099)  ($49,840)
  Fully eligible active plan participants          (11,115)    (3,192)
  Other active plan participants                   (52,112)   (22,074)
- ---------------------------------------------------------------------
Accumulated postretirement benefit obligations    (153,326)   (75,106)
Fair value of plan assets                           14,075      8,150
- ---------------------------------------------------------------------
Accumulated postretirement benefit obligations
  in excess of plan assets                        (139,251)   (66,956)
Unrecognized transition obligation                  48,522     51,757
Unrecognized net (gain) loss                        18,095     (5,307)
- ---------------------------------------------------------------------
  Accrued postretirement benefit costs            ($72,634)  ($20,506)
=====================================================================

EMPLOYEE THRIFT PLANS - The Company has  Thrift Plans covering substantially all
employees.  Employee contributions are discretionary.  Subject to certain
limits, employee contributions are matched by the Company.  The annual cost of
the plans was $4.7 million in 1998; $3.4 million in 1997; $3.7 million in 1996.

POSTEMPLOYMENT BENEFITS - The Company pays postemployment benefits to former or
inactive employees after 

                                      48
<PAGE>
 
employment but before normal retirement.

REGULATORY TREATMENT - The OCC has approved the recovery of  ONG pension costs
and other postretirement benefit costs through rates. The costs recovered
through rates are based on current funding requirements and the net periodic
postretirement benefit cost for pension and postretirement costs, respectively.
Differences, if any, between the expense and the amount ordered through rates
are charged to earnings.

Prior to the acquisition of the Kansas regulated properties in fiscal 1998
Western had established a corporate-owned life insurance ("COLI") program which
it believed in the long term would offset the expenses of its postretirement and
postemployment benefit plans. Accordingly, the KCC issued an order permitting
the deferral of postretirement and postemployment benefit expenses in excess of
amounts recognized on a pay-as-you-go basis. The Company did not acquire the
COLI program. In connection with the KCC's approval of the acquisition, the KCC
granted the Company the benefit of all previous accounting orders issued to
Western and requested that the Company submit a plan of recovery either through
a general rate increase or through specific cost savings or revenue increases.
Based on regulatory precedents established by the KCC, and the accounting order
which permits the Company to seek recovery through rates, management believes
that it is probable that accrued postretirement and postemployment benefits can
be recovered in rates. The Company plans to file for recovery of these costs and
anticipates that recovery will be allowed over a period not to exceed 20 years.
If these costs can not be recovered in rates charged to customers, the Company
would be required to record a one-time charge to expense the regulatory asset
established for postretirement and postemployment benefit costs totaling
approximately $51.6 million at August 31, 1998.

(I)  COMMITMENTS AND CONTINGENCIES

LEASES - The initial term of the Company's headquarters building, ONEOK Plaza,
is for 25 years, expiring in 2009, with six five-year renewal options.  At the
end of the initial term or any renewal period, the Company can purchase the
property at its fair market value.  Rent for the lease accrues annually at $6.8
million until 2009.  Rent payments were $5.8 million for 1998, 1997, and 1996.
Estimated future minimum rental payments for the lease are $5.8 million for the
year ended August 31, 1999, $7.6 million for the year ending August 31, 2000,
and $9.3 million for each of the years ending August 31, 2001 through 2009.

The Company has the right to sublet excess office space in ONEOK Plaza.  The
Company received $2.8 million, $2.7 million, and $2.5 million in rental revenue
during 1998, 1997, and 1996, respectively, for various subleases.  Estimated
minimum future rental payments to be received under existing contracts for
subleases are $2.4 million in 1999, $2.1 million in 2000, $2.0 million in 2001,
$1.9 million in 2002, $1.6 million in 2003, and a total of $2.2 million
thereafter.

Other operating leases include automotive fleets and office building and
equipment.  The total estimated payments for these leases are $1.4 million in
1999, $1.0 million in 2000, and $0.8 million in 2001 through 2003.

ENVIRONMENTAL - In connection with the Western transaction, the Company acquired
12 manufactured gas sites located in Kansas which may contain coal tar and other
potentially harmful materials that are classified as hazardous material.
Hazardous materials are subject to control or remediation under various
environmental laws and regulations. A consent agreement with the Kansas
Department of Health and Environment (KDHE) presently governs all future work at
these sites.  The terms of the consent agreement allow the Company to
investigate these sites and set remediation priorities based upon the results of
the investigations and risk analysis.  The prioritized sites will be
investigated over a ten year period.  At August 31, 1998, the costs of the
investigations and risk analysis have been minimal. Limited information is
available about the sites and no testing has been performed.  Management's best
estimate of the cost of remediation ranges from $100 thousand to $10 million per
site based on a limited comparison of costs incurred to remediate comparable
sites.  These estimates do not give effect to potential insurance recoveries,
recoveries through rates or from third parties.  The KCC has permitted others to
recover their remediation costs through rates.  It should be noted that
additional information and testing could result in costs significantly below or
in excess of the amounts estimated above. To the extent that such remediation
costs are not recovered, the costs could be material to the Company's results of
operations and cash flows depending on the degree of remediation required and
number of years over which the remediation must be completed.

OTHER - The Company is a party to other litigation matters and claims which are
normal in the course of its operations, 

                                      49
<PAGE>
 
and while the results of litigation and claims cannot be predicted with
certainty, management believes the final outcome of such matters will not have a
materially adverse effect on consolidated results of operations, financial
position, or liquidity.
 
(J)    INCOME TAXES

The provisions for income taxes are as follows:

- --------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                   1998      1997       1996
- --------------------------------------------------------------------
Current income taxes
  Federal                               62,462   $ 32,207   $ 29,925
  State                                 11,746      5,620      5,150
- --------------------------------------------------------------------
    Total current income taxes          74,208   $ 37,827   $ 35,075
====================================================================
Deferred income taxes
  Federal                               (6,325)   ($2,551)   ($1,766)
  State                                 (1,298)      (437)      (272)
- --------------------------------------------------------------------
    Total deferred income taxes         (7,623)   ($2,988)   ($2,038)
====================================================================
    Total provision for income taxes    66,585   $ 34,839   $ 33,037
====================================================================

Following is a reconciliation of the provision for income taxes.

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                                           1998      1997      1996
- ------------------------------------------------------------------------------------------
<S>                                                            <C>       <C>       <C>
Pretax income                                                  168,380   $94,107   $85,874
Federal statutory income tax rate                                 35.0%     35.0%     35.0%
- ------------------------------------------------------------------------------------------
Provision for federal income taxes                              58,933   $32,937   $30,056
Amortization of distribution property investment tax credit       (938)     (655)     (727)
State income taxes, net of credits and federal tax benefit       5,693     2,376     3,548
Other, net                                                       2,897       181       160
- ------------------------------------------------------------------------------------------
    Actual income tax expense                                   66,585   $34,839   $33,037
==========================================================================================
</TABLE>

The tax effects of temporary differences that gave rise to significant portions
of the deferred tax assets and liabilities are shown in the accompanying table.
 
- -------------------------------------------------------------------------
AUGUST 31,                                               1998      1997
(THOUSANDS OF DOLLARS)
- -------------------------------------------------------------------------
Deferred tax assets
  Accrued liabilities not deductible until paid           6,089     5,629
  Net operating loss carry forward                          854       760
  Regulatory assets                                       4,894     2,687
  Other                                                       -     2,791
- -------------------------------------------------------------------------
    Total deferred tax assets                            11,837    11,867
  Valuation allowance for net operating loss
    carryforward expected to expire prior to
    utilization                                             854       760
- -------------------------------------------------------------------------
    Net deferred tax assets                              10,983    11,107
Deferred tax liabilities
  Excess of tax over book depreciation and depletion    220,064   138,312
  Investment in joint ventures                            4,543     1,100
  Regulatory assets                                      77,454    53,683
  Other                                                  12,783     2,698
- -------------------------------------------------------------------------
    Gross deferred tax liabilities                      314,844   195,793
- -------------------------------------------------------------------------
    Net deferred tax liabilities                        303,861  $184,686
=========================================================================

                                      50
<PAGE>
 
The Company has remaining net operating loss carry-forwards for state income tax
purposes of approximately $15.8 million at August 31, 1998, which expire, unless
previously utilized, at various dates through the year 2009.  At August 31,
1998, the Company had $9.6 million in deferred investment tax credits recorded
in other deferred credits which will be amortized over the next 17 years.

(K)  SEGMENT INFORMATION

The Company conducts its business through five reporting segments: (1)
Regulated, which includes gathering, transportation, storage, and distribution
of natural gas, transportation of gas for others, and leasing pipeline capacity;
(2) Marketing, which purchases and markets natural gas; (3) Gathering and
Processing, which includes extracting and selling natural gas liquids; (4)
Production, which includes exploiting, producing, and selling natural gas and
oil; and (5) Other, which includes operating and leasing the Company's
headquarters building and a related parking facility.

Following is information relative to the Company's operations in different
segments.

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------
                      1998                                              Gathering &
(Millions of Dollars)                             Regulated  Marketing  Processing   Production   Other    Total
- ------------------------------------------------------------------------------------------------------------------
 
<S>                                               <C>        <C>        <C>          <C>         <C>      <C>
Sales to unaffiliated customers                    $  971.9     $746.8        $79.1      $ 31.9  $  5.7   $1,835.4
Intersegment sales                                     22.8       31.8         15.4        12.7    18.7      101.4
- ------------------------------------------------------------------------------------------------------------------
  Total Revenues                                   $  994.7     $778.6        $94.5      $ 44.6  $ 24.4   $1,936.8
- ------------------------------------------------------------------------------------------------------------------
Income (loss) before interest and income taxes     $  149.4     $ 12.3        $31.0      $ 10.9   ($0.1)  $  203.5
Indentifiable assets                               $1,931.9     $123.9        $63.2      $246.1  $ 57.4   $2,422.5
Depreciation, depletion, and amortization          $   79.0     $  0.6        $ 2.2      $ 18.9  $  0.9   $  101.6
Capital expenditures                               $  113.8     $  0.0        $18.4      $167.7  $  6.5   $  306.4
- ------------------------------------------------------------------------------------------------------------------
<CAPTION>  
- ------------------------------------------------------------------------------------------------------------------
                      1997                                              Gathering &
(Millions of Dollars)                             Regulated  Marketing  Processing   Production   Other    Total
- ------------------------------------------------------------------------------------------------------------------
 
<S>                                               <C>        <C>        <C>          <C>         <C>      <C>
Sales to unaffiliated customers                    $  598.4     $459.6        $71.6      $ 27.2  $  5.1   $1,161.9
Intersegment sales                                      1.1       23.5         15.5        14.0     5.2       59.3
- ------------------------------------------------------------------------------------------------------------------
  Total Revenues                                   $  599.5     $483.1        $87.1      $ 41.2  $ 10.3   $1,221.2
- ------------------------------------------------------------------------------------------------------------------
Income (loss) before interest and income taxes     $  100.4     $  7.8        $12.9      $  8.7   ($1.0)  $  128.8
Indentifiable assets                               $1,026.3     $ 63.8        $36.0      $100.1  $ 11.2   $1,237.4
Depreciation, depletion, and amortization          $   51.4     $  0.5        $ 2.4      $ 19.9  $  0.3   $   74.5
Capital expenditures                               $   67.7     $  0.4        $10.6      $ 32.9  $  0.4   $  112.0
- ------------------------------------------------------------------------------------------------------------------
<CAPTION>  

- ------------------------------------------------------------------------------------------------------------------
                      1996                                              Gathering &
(Millions of Dollars)                             Regulated  Marketing  Processing   Production   Other    Total
- ------------------------------------------------------------------------------------------------------------------
 
<S>                                               <C>        <C>        <C>          <C>         <C>      <C>
Sales to unaffiliated customers                    $  538.2     $598.3        $58.4       $25.5  $  4.0   $1,224.4
Intersegment sales                                      2.2       15.5         12.7         7.9     5.4       43.7
- ------------------------------------------------------------------------------------------------------------------
  Total Revenues                                   $  540.4     $613.8        $71.1       $33.4  $  9.4   $1,268.1
- ------------------------------------------------------------------------------------------------------------------
Income (loss) before interest and income taxes     $   97.3     $ 12.9        $ 9.0       $ 2.8   ($1.0)  $  121.0
Indentifiable assets                               $1,019.4     $ 71.2        $26.7       $73.2  $ 29.4   $1,219.9
Depreciation, depletion, and amortization          $   50.8     $  0.5        $ 2.0       $19.2  $  0.4   $   72.9
Capital expenditures                               $   42.9     $  0.4        $ 5.2       $46.7  $  0.2   $   95.4
- ------------------------------------------------------------------------------------------------------------------
</TABLE> 

                                      51
<PAGE>
 
(L)  QUARTERLY FINANCIAL DATA (UNAUDITED)

Total operating revenues are consistently greater from November through May due
to the large volume of natural gas sold to customers for heating.  A summary of
the unaudited quarterly results of operations for 1998 and 1997 follows:


<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------
                        1998                                           Quarter
                                                     -----------------------------------------
(Thousands of Dollars, Except Per Share Amounts)        First     Second    Third      Fourth
- ----------------------------------------------------------------------------------------------
 
Operating revenues
<S>                                                    <C>       <C>       <C>       <C>
  Regulated                                            $118,637  $470,314  $256,434  $ 126,520
  Nonregulated                                         $195,523  $251,740  $187,614  $ 228,620
Income before interest and income taxes                $ 21,048  $ 84,638  $ 32,780    ($1,596)
Income taxes                                           $  7,438  $ 46,611  $ 17,270    ($4,734)
Net income (loss)                                      $ 12,520  $ 73,836  $ 26,936   ($11,497)
Earnings (loss) per share of common stock - basic      $   0.44  $   2.06  $   0.57     ($0.65)
Earnings (loss) per share of common stock - diluted    $   0.44  $   1.43  $   0.52     ($0.65)
Dividends per share of common stock                    $   0.30  $   0.30  $   0.30  $    0.30
Average shares of common stock
  outstanding (thousands) - basic                        28,268    31,466    31,536     31,586
Average shares of common stock
  outstanding (thousands) - diluted                      28,268    51,576    51,589     31,586
- ----------------------------------------------------------------------------------------------
<CAPTION> 
- -----------------------------------------------------------------------------------------------
                         1997                                            Quarter
                                                       ----------------------------------------
(Thousands of Dollars, Except Per Share Amounts)          First     Second    Third     Fourth
- -----------------------------------------------------------------------------------------------
Operating revenues
<S>                                                      <C>       <C>       <C>       <C>
  Regulated                                              $113,246  $282,794  $128,970  $ 73,380
  Nonregulated                                           $135,506  $190,859  $102,657  $134,515
Income before interest and income taxes (loss)           $ 28,678  $ 71,057  $ 29,924     ($867)
Income taxes                                             $  7,665  $ 23,818  $  8,174   ($4,816)
Net income (loss)                                        $ 12,174  $ 38,241  $ 13,769   ($4,916)
Earnings (loss) per share of common stock - basic and
  diluted                                                $   0.44  $   1.39  $   0.49    ($0.19)
Dividends per share of common stock                      $   0.30  $   0.30  $   0.30  $   0.30
Average shares of common stock
  outstanding (thousands) - basic and diluted              27,305    27,378    27,897    28,018
- -----------------------------------------------------------------------------------------------
</TABLE>

(M)  SUPPLEMENTAL CASH FLOW INFORMATION

The  table presents supplemental information relative to the Company's cash
flows for the years ended August 31, 1998, 1997,  and 1996.

- --------------------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                                1998      1997     1996
- -------------------------------------------------             
                                                              
Cash paid during the year                                     
    Interest (including amounts capitalized)       $   34,637  $39,993  $35,122
    Income taxes                                   $   73,772  $34,618  $40,642
Noncash transactions:                                         
    Gas received as payment in kind                $      280  $   478  $ 2,395
    Issuance of common stock related to:                      
      Stock Performance Plan                                -        -  $ 1,144
      Dividend reinvestment plan                            -  $ 5,482  $ 4,536
    Distribution of net assets from partnership             -        -  $14,625
    Acquisitions                                              
      Plant, property and equipment                $  642,742        -        -
      Current assets                               $  232,738        -        -
      Current liabilities                            ($42,575)       -        -
      Debt assumed                                  ($161,698)       -        -
      Regulatory assets and goodwill               $  169,983        -        -
      Deferred debits                              $   62,633        -        -
      Deferred credits                               ($89,655)       -        -
      Deferred income taxes                         ($127,744)       -        -
      Capital stock                                 ($662,003)
                                                 ------------ 
      Cash paid                                    $   24,421        -        -
================================================================================

                                      52
<PAGE>
(N)  STOCK BASED COMPENSATION

KEY EMPLOYEE STOCK PLAN - On August 17, 1995, the Company adopted the Key
Employee Stock Plan (Plan).  The Plan provides for the granting of incentive
stock options, fixed stock options, and stock bonus awards to key employees.
Under the Plan, options may be granted by the Executive Compensation Committee
(the Committee) at any time within ten years thereafter (before August 17,
2005).  Options may be granted which are not exercisable until a fixed future
date or in installments.  The Plan also provides for restored options in the
event that the optionee surrenders shares of common stock which the optionee
already owns in full or partial payment of the options price under this option
and/or surrenders shares of common stock to satisfy withholding tax obligations
incident to the exercise of this option.  A restored option has an option price
equal to the fair market value of the common stock on the date on which the
exercise of the option resulted in the grant of the restored option.  The
Company has reserved one million shares of common stock for the Plan.

- ---------------------------------------------------
                         Number    Weighted Average
                       Of Shares    Exercise Price
- ---------------------------------------------------
Outstanding at
  September 1, 1995            0             $ 0.00
Granted                  107,400             $23.69
- ---------------------------------------------------
 
Outstanding at
  August 31, 1996        107,400             $23.69
Granted                  100,700             $26.88
Exercised                (20,700)            $23.69
Expired                   (2,200)            $26.69
Restored                   4,147             $30.71
- ---------------------------------------------------
 
Outstanding at
  August 31, 1997        189,347             $25.54
Granted                  262,576             $33.39
Exercised                (96,047)            $25.55
Expired                   (4,900)            $33.94
- ---------------------------------------------------
Outstanding at
  August 31, 1998        350,976             $31.30
- ---------------------------------------------------

Options issued to date become void upon voluntary termination of employment
other than retirement.  In the event of retirement or involuntary termination,
the optionee may exercise the option within three months.  In the event of
death, the option may be exercised by the personal representative of the
optionee within a period to be determined by the Committee and stated in the
option. Options issued to date can be exercised after one year from grant date
and must be exercised no more than ten years after grant date.  Activity to date
has been as follows:

At August 31, 1998, the Company had 92,800 outstanding options with exercise
prices ranging between $23.69 to $29.81 and a weighted average remaining life of
7.72 year, respectively.  All of these options were exercisable at August 31,
1998 with a weighted average exercise price of $25.52.

The Company also had 258,176 option outstanding at August 31, 1998 with exercise
prices ranging between $32.41 and $42.53 and a weighted average remaining
contractual life of 9.05 years.  Of these options, 1,669 were exercisable at
August 31, 1998 at a price of $40.25.

EMPLOYEE STOCK PURCHASE PLAN - In 1995, the Company authorized the Employee
Stock Purchase Plan and reserved 350,000 shares of common stock for it.  Almost
all full-time employees are eligible to participate.  Under the terms of the
plan, employees can choose to have up to ten percent of their annual earnings
withheld to purchase the Company's common stock.  The Committee may allow
contributions to be made by other means provided that in no event will
contributions from all means exceed ten percent of the employee's annual
earnings.  The purchase price of the stock is 85 percent of the lower of its
beginning-of-year or end-of-year market price.  Approximately 60 percent and 55
percent of eligible employees participated in the plan in fiscal 1998 and 1997,
respectively.  Under the plan, the Company sold 105,923 shares in December 1997
and 107,080 shares in December 1996.

- -----------------------------------------------------------
                                   1998     1997     1996
- -----------------------------------------------------------
Net Income (000's)
  As reported                    $101,795  $59,268  $52,836
  Pro forma                      $ 98,592  $58,247  $52,013
Earnings per share - Diluted
  As reported                    $   2.23  $  2.13  $  1.93
  Pro forma                      $   2.16  $  2.10  $  1.90
===========================================================

ACCOUNTING TREATMENT - The Company continues to apply APB 25 in accounting for
both plans and accordingly, no compensation has been recognized in the
consolidated financial statements.  Had the Company applied the provisions of
SFAS 123 to determine the compensation cost  under these plans, the Company's
pro forma net income and diluted earnings per share would have been as follows:

The fair market value of each option granted is estimated based on the Black-
Scholes model. Based on previous stock performance, volatility is estimated to
be .2720 for 1998 and .2264 for both 1997 and 1996. Dividend yield is estimated
to be 3.9 percent for 1998

                                      53
<PAGE>
 
and 3.7 percent for both 1997 and 1996, with a risk-free interest rate of 5.032
percent, 6.590 percent and 5.947 percent in 1998, 1997, and 1996, respectively.

Expected life ranged from 1 to 10 years based upon experience to date and the
make-up of the optionees.  Fair value of options granted under the Plan were
$8.75, $11.58, and $9.55 for 1998, 1997, and 1996 respectively.

(O)  EARNINGS PER SHARE INFORMATION

The Company adopted SFAS 128, during the second quarter of fiscal 1998.  All
prior periods have been restated.  SFAS 128 replaces the "primary earnings per
share" (primary EPS) and "fully diluted earnings per share" (fully diluted EPS)
with "basic earnings per share" (basic EPS) and "diluted earnings per share"
(diluted EPS). Unlike the calculation of primary EPS which includes, in its
denominator, "common stock equivalents" basic EPS is calculated using only the
actual weighted average shares outstanding during the relevant periods.  The
following is a required reconciliation of the numerators and denominators of the
basic and diluted EPS computations.
 
The effect of dilutive options in fiscal 1997 and 1996 is insignificant.

- ---------------------------------------------------------------------
August 31, 1998                                             Per Share
(In Thousands)                             Income   Shares   Amount
- ---------------------------------------------------------------------
BASIC EPS
Income available to common stockholders     74,816  30,674      $2.44
                                                                =====
EFFECT OF DILUTIVE SECURITIES
   Options                                              53
   Convertible preferred stock              26,979  15,002
                                           -------  ------
DILUTED EPS
Income available to common stockholders
  + assumed conversions                    101,795  45,729      $2.23
=====================================================================
 
 
- ---------------------------------------------------------------------
August 31, 1997                                             Per Share
(In Thousands)                             Income   Shares   Amount
- ---------------------------------------------------------------------
BASIC AND DILUTED EPS
Income available to common stockholders     58,983  27,644      $2.13
=====================================================================
 
 
- ---------------------------------------------------------------------
August 31, 1996                                             Per Share
(In Thousands)                             Income   Shares   Amount
- ---------------------------------------------------------------------
BASIC AND DILUTED EPS
Income available to common stockholders     52,408  27,136      $1.93
=====================================================================


(P)  OIL AND GAS PRODUCING ACTIVITIES

The following is historical revenue and cost information relating to the
Company's production operations:

- ------------------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                              1998      1997      1996
- ------------------------------------------------------------------------------
Capitalized costs at end of year              
  Unproved properties                             $  3,505  $  2,994  $ 11,330
  Proved properties                                320,055   155,208   129,035
- ------------------------------------------------------------------------------
    Total capitalized costs                        323,560   158,202   140,365
  Accumulated depreciation, depletion, and         100,601    83,457    74,129
    amortization                              
- ------------------------------------------------------------------------------
    Net capitalized costs                         $222,959  $ 74,745  $ 66,236
==============================================================================
Costs incurred during the year:               
  Property acquisition costs (unproved)           $    601  $    174  $    231
  Exploitation costs                              $      6  $     71  $    601
  Development costs                               $ 15,315  $  6,683  $  2,811
  Purchase of minerals in place                   $151,019  $ 21,489  $ 43,064
- ------------------------------------------------------------------------------


The accompanying schedule presents the results of operation of the Company's oil
and gas producing activities.  The results exclude general office overhead and
interest expense attributable to oil and gas production.

- -----------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                        1998      1997     1996
- -----------------------------------------------------------------------
Net revenues from production:             
  Sales to unaffiliated customers            $30,003  $24,141   $17,325
  Gas sold to affiliates                      12,312   14,018     7,856
- -----------------------------------------------------------------------
    Net revenues from production              42,315   38,159    25,181
- -----------------------------------------------------------------------
Production costs                               9,478    7,918     5,494
Exploitation expenses                            351      (12)      574
Depreciation, depletion, and amortization     18,210   19,246    18,552
Income tax expense                             5,522    4,258       171
- -----------------------------------------------------------------------
    Total expenses                            33,561   31,410    24,791
- -----------------------------------------------------------------------
    Results of operations from producing     $ 8,754  $ 6,749   $   390
      activities                          
=======================================================================

                                      54
<PAGE>
 
(Q)  OIL AND GAS RESERVES (UNAUDITED)

Following are estimates of the Company's proved oil and gas reserves, net of
royalty interests and changes herein, for the 1998, 1997, and 1996 fiscal years.

The Company emphasizes that the volumes of reserves shown are estimates, which,
by their nature, are subject to later revision.  The estimates are made by the
Company utilizing all available geological and reservoir data as well as
production performance data.  These estimates are reviewed annually and revised,
either upward or downward, as warranted by additional performance data.
 
- ------------------------------------------------------------------
                                                    OIL      GAS
PROVED RESERVES                                   (MBBLS)   (MMCF)
- ------------------------------------------------------------------
August 31, 1995                                    3,247    39,226
  Revisions of prior estimates                       (59)   (1,258)
  Extensions, discoveries, and other additions        41     5,089
  Purchases of minerals in place                     928    42,347
  Sales of minerals in place                      (1,712)   (1,930)
  Production                                        (435)   (9,406)
- ------------------------------------------------------------------
August 31, 1996                                    2,010    74,068
  Revisions of prior estimates                       115     2,108
  Extensions, discoveries, and other additions       111     3,009
  Purchases of minerals in place                     155    19,214
  Sales of minerals in place                         (41)     (515)
  Production                                        (336)  (14,565)
- ------------------------------------------------------------------
AUGUST 31, 1997                                    2,014    83,319
  REVISIONS OF PRIOR ESTIMATES                      (223)   (1,255)
  EXTENSIONS, DISCOVERIES, AND OTHER ADDITIONS       167    23,251
  PURCHASES OF MINERALS IN PLACE                   1,645    89,724
  SALES OF MINERALS IN PLACE                          (1)     (174)
  PRODUCTION                                        (330)  (16,818)
- ------------------------------------------------------------------
AUGUST 31, 1998                                    3,272   178,047
==================================================================
Proved developed reserves
  August 31, 1996                                  1,642    60,497
  August 31, 1997                                  1,615    62,115
  AUGUST 31, 1998                                  2,228   134,346
- ------------------------------------------------------------------


(R)  DISCOUNTED FUTURE NET CASH FLOWS (UNAUDITED)

Estimates of the standard measure of discounted future cash flows from proved
reserves of oil and natural gas shown in the accompanying table are based on
prices at the end of the year.  Gas prices are escalated only for fixed and
determinable amounts under provisions of applicable regulations in some
contracts.  These estimated future cash flows are reduced by estimated future
development and production costs based on year-end cost levels, assuming
continuation of existing economic conditions, and by estimated future income tax
expense.  The tax expense is calculated by applying the current year-end
statutory tax rates to pretax net cash flows (net of tax depreciation,
depletion, and lease amortization allowances) applicable to oil and gas
production.

The changes in standardized measure of discounted future net cash flow relating
to proved oil and gas reserves are as follows:

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                                  1998      1997      1996
- ----------------------------------------------------------------------------------
<S>                                                   <C>       <C>       <C>
Future cash inflows                                   $423,331  $218,708  $173,166
Future production and development costs                129,128    67,962    53,491
Future income tax expense                               32,025    33,514    21,245
- ----------------------------------------------------------------------------------
Future net cash flows                                  262,178   117,232    98,430
10 percent annual discount for estimated
    timing of cash flows                                99,549    40,621    31,114
- ----------------------------------------------------------------------------------
Standardized measure of discounted future net cash
  flows relating to oil and gas reserves              $162,629  $ 76,611  $ 67,316
==================================================================================
</TABLE>

                                      55
<PAGE>
 
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------
(THOUSANDS OF DOLLARS)                                         1998       1997       1996
- -------------------------------------------------------------------------------------------
<S>                                                          <C>        <C>        <C>
Beginning of year                                            $ 76,611   $ 67,316   $ 47,827
Changes resulting from:
  Sales of oil and gas produced, net of production costs      (32,837)   (30,241)   (19,687)
  Net changes in price, development, and production costs      (6,269)    12,478      4,054
  Extensions, discoveries, additions, and improved
    recovery, less related costs                               26,217      5,047      6,056
  Purchases of minerals in place                               94,031     19,747     42,999
  Sales of minerals in place                                     (142)    (1,000)   (20,962)
  Revisions of previous quantity estimates                     (2,750)     3,159       (114)
  Accretion of discount                                         9,865      8,084      3,885
Net change in income taxes                                      3,055     (7,372)    (2,538)
Other, net                                                     (5,152)      (607)     5,796
- -------------------------------------------------------------------------------------------
End of year                                                  $162,629   $ 76,611   $ 67,316
===========================================================================================
</TABLE>

                                      56
<PAGE>
 
ITEM 9.   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
          FINANCIAL DISCLOSURE

None
                                   PART III.

ITEM 10.  DIRECTORS, EXECUTIVE OFFICERS, PROMOTERS, AND CONTROL PERSONS OF THE
          REGISTRANT

(A)  DIRECTORS OF THE REGISTRANT

     Information concerning the directors of the Company is shown in the 1999
     definitive Proxy Statement which is incorporated herein by this reference.

(B)  EXECUTIVE OFFICERS OF THE REGISTRANT

     Information concerning the executive officers of the Company is included in
     Part I of this Form 10-K.

(C)  COMPLIANCE WITH SECTION 16(A) OF THE EXCHANGE ACT

     Information on compliance with Section 16(a) of the Exchange Act is
     included in the 1999 definitive Proxy Statement which is incorporated
     herein by this reference.

ITEM 11.  EXECUTIVE COMPENSATION

Information on executive compensation is shown in the 1999 definitive Proxy
Statement which is incorporated herein by this reference.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

(A)  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS

     Information concerning the ownership of certain beneficial owners is shown
     in the 1999 definitive Proxy Statement which is incorporated herein by this
     reference.

(B)  SECURITY OWNERSHIP OF MANAGEMENT

     Information on security ownership of directors and officers is shown in the
     1999 definitive Proxy Statement which is incorporated herein by this
     reference.


ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

None

                                      57
<PAGE>
 
                                   PART IV.

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

(A)  DOCUMENTS FILED AS A PART OF THIS REPORT

(1)  Exhibits

     (3)(a) Certificate of Incorporation of WAI, Inc. (Now ONEOK, Inc.), filed
            May 16, 1997 (Incorporated by reference from Exhibit 3.1 to
            Amendment No. 3 to Registration Statement on Form S-4 filed August
            6, 1997).

     (3)(b) Certificate of Merger of ONEOK, Inc. (Formerly WAI, Inc.) Filed
            November 26, 1997 (Incorporated by reference from Exhibit (1)(b) to
            Form 10-Q dated May 31, 1998).

     (3)(c) Amendment to Certificate of Incorporation of ONEOK, Inc., filed
            January 16, 1998 (Incorporated by reference from Exhibit (1)(b) to
            Form 10-Q dated May 31, 1998).

     (3)(d) By-laws of ONEOK, Inc., as amended (Incorporated by reference from
            Exhibit 3.2 to Amendment No. 3 to Registration Statement on Form S-4
            filed August 31, 1997).

     (4)(a) Article "Fourth" of the Certificate of Incorporation of ONEOK, Inc.
            (Preferred Stock and Common Stock), Incorporated by reference from
            Exhibit 3.1 to Amendment No. 3 to Registration Statement on Form S-4
            filed August 31, 1997)

     (4)(b) Certificate of Designation for Convertible Preferred stock of WAI,
            Inc. (Now ONEOK, Inc.) filed November 26, 1997 (Incorporated by
            reference from Exhibit 3.3 to Amendment No. 3 to Registration
            Statement on Form S-4 filed August 31, 1997).

     (4)(c) Certificate of Designation for Series C Participating Preferred
            Stock of ONEOK, Inc., filed November 26, 1998 (Incorporated by
            reference from Exhibit No. 1 to Form 8-A, filed November 26, 1997).

     (4)(d) Indenture, dated November 28, 1989, between ONEOK Inc. and Security
            Pacific National Bank, incorporated by reference from Form S-3
            Registration Statement No. 33-31979.

     (4)(e) Indenture, dated December 1, 1990, between ONEOK Inc. and Security
            Pacific National Bank, incorporated by reference from Form 10-K
            dated August 31, 1991.

     (4)(f) First Supplemental Indenture dated December 1, 1990, between ONEOK
            Inc. and Security Pacific National Bank, incorporated by reference
            from Form 10-K dated August 31, 1991.

     (4)(g) Second Supplemental Indenture dated October 1, 1991, between ONEOK
            Inc. and Security Pacific National Bank, incorporated by reference
            from Form 10-K dated August 31, 1991.

            NOTE: Certain instruments defining the rights of holders of long-
            term debt are not being filed as exhibits hereto pursuant to Item
            601(b)(4)(iii) of Registration S-K. The Company agrees to furnish
            copies of such agreements to the SEC upon request.

     (4)(h) Rights Agreement, dated November 26, 1997, between ONEOK, Inc. and
            Liberty Bank and Trust Company of Oklahoma City, N.A., as Rights
            Agent (Incorporated by reference from Exhibit 2.3 to Amendment No. 3
            to Registration Statement on Form S-4 filed August 31, 1997).

     (4)(i) Shareholder Agreement, dated November 26, 1997, between Western
            Resources, Inc. and ONEOK, Inc. (Incorporated by reference from
            Exhibit 2.2 to Amendment No. 3 to Registration Statement on Form 


                                      58
<PAGE>
 
             S-4 filed August 31, 1997).

     (10)(a) Key Employee Stock Plan, incorporated by reference from the 1995
             Definitive Proxy Statement.

     (10)(b) Unfunded Excess Benefit Plan of ONEOK Inc., incorporated by
             reference from the 1991 Definitive Proxy Statement.

     (10)(c) Termination agreement between ONEOK Inc., and ONEOK Inc. Executives
             dated January 20, 1984, incorporated by reference from Form 10-K
             dated August 31, 1984.

     (10)(d) Indemnification agreement between ONEOK Inc., and ONEOK Inc.
             Officers and Directors, incorporated by reference from Form 10-K
             dated August 31, 1984.

     (10)(e) Ground Lease Between ONEOK Leasing Company and Southwestern
             Associates dated May 15, 1983, incorporated by reference from Form
             10-K dated August 31, 1983.

     (10)(f) First Amendment to Ground Lease between ONEOK Leasing Company and
             Southwestern Associates dated October 1, 1984, incorporated by
             reference from Form 10-K dated August 31, 1984.

     (10)(g) Sublease Between RMZ Corp. and ONEOK Leasing Company dated May 15,
             1983, incorporated by reference from Form 10-K dated August 31,
             1983.

     (10)(h) First Amendment to Sublease between RMZ Corp. and ONEOK Leasing
             Company dated October 1, 1984, incorporated by reference from Form
             10-K dated August 31, 1984.

     (10)(i) ONEOK Leasing Company Lease Agreement with Oklahoma Natural Gas
             Company dated August 31, 1984, incorporated by reference from Form
             10-K dated August 31, 1985.

     (10)(j) Private Placement Agreement ONEOK Inc. and Paine Webber
             Incorporated, dated April 6, 1993, (Medium-Term Notes, Series A, up
             to U.S. $150,000,000), incorporated by reference from Form 10-K
             dated August 31, 1993.

     (10)(k) Issuing and Paying Agency Agreement between Bank of America Trust
             Company of New York, as Issuing and Paying Agent, and ONEOK Inc,
             (Medium-Term Notes, Series A, up to U.S. $150,000,000),
             incorporated by reference from Form 10-K dated August 31, 1993.

     (10)(l) Amended and Restated Credit Agreement, dated August 12, 1998, among
             ONEOK, Inc., the financial institutions signatories thereto and
             Bank of America National Trust and Saving Association, as Agent
             incorporated by reference from Form 8-k dated August 25, 1998.

     (12)    Computation of Ratio of Earnings to Combined Fixed Charges and
             Preferred Stock Dividend Requirement.

     (12)(a) Computation of Ratio of Earnings to Fixed Charges.

     (21)    Required information concerning the registrant's subsidiaries.

     (23)    Independent Auditors' Consent, filed herewith on page 66.

     (27)(a) Financial Data Schedule for year ended August 31, 1998.

     (27)(b) Financial Data Schedule for year ended August 31, 1997.

     (27)(c) Financial Data Schedule for year ended August 31, 1996.
 
                                      59
<PAGE>
 
(2)  Financial Statements                                               Page No.
     (a)    Independent Auditors' Report.                               34
     (b)    Consolidated Statements of Income for the years ended
            August 31, 1998, 1997, and 1996.                            35
     (c)    Consolidated Balance Sheets at August 31, 1998 and 1997.    36 - 37
     (d)    Consolidated Statements of Cash Flows for the years ended
            August 31, 1998, 1997, and 1996.                            38
     (e)    Consolidated Statements of Shareholder's Equity for the      
            years ended August 31, 1998, 1997, and 1996.                39
     (f)    Notes to Consolidated Financial Statements.                 40 - 56
 
(3)  Financial Statement Schedules

     None.

(B)  REPORTS ON FORM 8-K

     July 23, 1998 - announcement of upgrade of corporate credit rating by
     Standard & Poor's to A from A-.

     August 25, 1998 - Short-term credit agreement between ONEOK, Inc. and Bank
     of America.

OTHER MATTERS

None.

                                      60
<PAGE>
 
                                  SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized, on this 23rd day of
September 1998.



                                   ONEOK, Inc.
                                   Registrant
                               
                                   By:  J. D. Neal
                                        ---------------------------------------
                                        J. D. Neal
                                        Vice President, Chief Financial Officer,
                                        and Treasurer (Principal Financial and
                                        Accounting Officer)
<PAGE>
 
                                  SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, this report has been signed below by the following persons on
behalf of the registrant and in the capacities indicated, on this 23rd day of
September 1998.


LARRY BRUMMETT                           D. L. KYLE
- --------------------------               --------------------------      
Larry Brummett                           D. L. Kyle                      
Chairman of the Board,                   President of ONEOK,             
Chief Executive                          Chief Operating Officer         
Officer, and Director                    And Director                    
                                                                         
E. G. ANDERSON                           B. H. MACKIE                    
- --------------------------               --------------------------      
E. G. Anderson                           B. H. Mackie                    
Director                                 Director                        
                                                                         
W. M. BELL                               J. D. NEAL                      
- --------------------------               --------------------------      
W. M. Bell                               J. D. Neal                      
Director                                 Vice President, Treasurer,      
                                         and Chief Financial Officer     
                                                                         
D. R. CUMMINGS                           D. A. NEWSOM          
- --------------------------               --------------------------      
D. R. Cummings                           D. A. Newsom          
Director                                 Director              
                                                                         
W. L. FORD                               G. D. PARKER          
- --------------------------               --------------------------      
W. L. Ford                               G. D. Parker          
Director                                 Director              
                                                                         
J. M. GRAVES                             J. D. SCOTT           
- --------------------------               --------------------------      
J. M. Graves                             J. D. Scott           
Director                                 Director              
                                                                         
S. J. JATRAS                             S. L. YOUNG           
- --------------------------               --------------------------      
S. J. Jatras                             S. L. Young           
Director                                 Director            
                                                                         
H. R. FRICKE                             S. L. KITCHEN         
- --------------------------               --------------------------      
H. R. Fricke                             S. L. Kitchen
Director                                 Director
 
<PAGE>
 
    Please mark your votes
[X] as in the example.   
 
This Proxy when properly executed will be voted in the manner directed herein
by the undersigned shareholder(s).

If no direction is made, this Proxy will be voted FOR Items 1, 2, and 3.

- ------------------------------------------------------------------------------- 
The Board of Directors recommends a vote "FOR" proposals 1, 2, and 3.
- ------------------------------------------------------------------------------- 
<TABLE>

<S>                          <C>            <C>            <C>                  <C>
1.  Election of four        For            Withheld       Withheld only For    Nominees:
Directors in Class B and    All            For All        Nominees Listed      Class B
one Director in Class A     Nominees       Nominees       Below*               ------- 
                            [ ]            [ ]            [ ]                  William M. Bell
                                                                               Douglas R. Cummings
                                                                               Howard R. Fricke
                                                                               David L. Kyle

                                                                               Class A
                                                                               ------- 
                                                                               Douglas T. Lake
</TABLE>
- ------------------------------------------------------------------------------- 
For, except vote withheld from the following nominee(s):
 
_____________________________________________
- ------------------------------------------------------------------------------- 
 
2.  Amend and restate the    For               Against              Abstain
Key Employee Stock Plan      [ ]               [ ]                  [ ] 
of the Corporation
 
3.  Ratify and approve the   For               Against              Abstain
appointment of KPMG Peat     [ ]               [ ]                  [ ] 
Marwick LLP as
Independent Auditor of
the Corporation for the
1999 Fiscal Year
- --------------------------------------------------------------------------------

Trustee's Authorization.  The Undersigned Authorizes First Chicago Trust Company
of New York to vote all shares of Common Stock of the Company credited to the
undersigned's account under either The Thrift Plan for Employees of ONEOK, Inc.
and Subsidiaries or the ONEOK, Inc. KGS 401(k) Thrift Plan at the annual meeting
in accordance with the instructions on the reverse side.

                           [ ]  Yes, I plan to attend the Annual Meeting.

                           [ ]  No,  I do not plan to attend the Annual Meeting.

SIGNATURE(S) ________________________________________________  DATE ___________

NOTE:  Please sign exactly as name appears hereon.  Joint owners should each
       sign.  When signing as attorney, executor, administrator, trustee or
       guardian, please give full title as such.  If signer is a corporation,
       please sign full corporate name by duly authorized officer.
<PAGE>
 
                     SOLICITED BY THE BOARD OF DIRECTORS OF
                                  ONEOK, INC.
                         ANNUAL MEETING OF SHAREHOLDERS
                                January 21, 1999

   The undersigned hereby appoints Larry W. Brummett and David L. Kyle and each
or either of them, with power of substitution, proxies for the undersigned and
authorizes them to represent and vote, as designated, all of the shares of
Common Stock, $0.01 par value ("Common Stock"), of ONEOK, Inc. ("ONEOK") held of
record by the undersigned on November 24, 1998, at the Annual Meeting of
Shareholders (the "Annual Meeting") to be held at ONEOK Plaza, 100 West Fifth
Street, Tulsa, Oklahoma 74103-0871 on January 21, 1999, and at any
adjournment(s) or postponement(s)  thereof, upon the following matters as
specified and in their discretion upon such other business as may properly come
before the meeting or any adjournment(s) or postponements(s) thereof.


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission