ONEOK INC /NEW/
8-K, 1999-08-17
NATURAL GAS TRANSMISISON & DISTRIBUTION
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549



                                    FORM 8-K


                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                        SECURITIES EXCHANGE ACT OF 1934


                                August 17, 1999
                Date of Report (Date of earliest event reported)



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


         Oklahoma                        1-2572                   73-1520922
(State or other jurisdiction          (Commission               (IRS Employer
     of incorporation)                File Number)           Identification No.)

                        100 West Fifth Street, Tulsa, OK
                    (Address of principal executive offices)

                                     74103
                                   (Zip code)

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

                                 Not Applicable
         (Former name or former address, if changed since last report)
<PAGE>

Item 1.  Not Applicable.

Item 5.  Other Events.

     On August 17, 1999, ONEOK, Inc. (the "Company") consummated an
underwritten public offering of $300,000,000 aggregate principal amount of the
Company's 7 3/4% Notes Due August 15, 2006. The Offering was made pursuant to
a Prospectus Supplement dated August 12, 1999 that supplements the Company's
Prospectus dated August 12, 1999 and that relates to the Company's
Registration Statement on Form S-3 (SEC File No. 333-76375).

     Additional information with respect to the Offering described herein is set
forth in the exhibits hereto.

Item 6.  Not Applicable.

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.

Exhibit No.      Description

   (1)(a)        Underwriting Agreement.

   (1)(b)        Price Determination Agreement.

    (4)          Fifth Supplemental Indenture.

    (99)         Incorporated by Reference - Southwest Gas Corporation Quarterly
                 Report on Form 10-Q for the quarter ended June 30, 1999
                 (Commision File No. 1-07850).

Item 8.  Not Applicable.

                                       2
<PAGE>

                                   SIGNATURES


     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized, on this 17th day of August, 1999.

                                    ONEOK, Inc.



                                    By: /s/ J.A. Gaberino, Jr.
                                        ________________________________________
                                        Senior Vice President and
                                        General Counsel

                                       3
<PAGE>

                                 EXHIBIT INDEX


Exhibit No.      Description

   (1)(a)        Underwriting Agreement.

   (1)(b)        Price Determination Agreement.

    (4)          Fifth Supplemental Indenture.

   (99)          Incorporated by Reference - Southwest Gas Corporation Quarterly
                 Report on Form 10-Q for the quarter ended June 30, 1999
                 (Commission File No. 1-07850).

<PAGE>

                                                                    Exhibit 1(a)


                                  ONEOK, INC.

                                  $300,000,000
                        7 3/4% Notes Due August 15, 2006

                             UNDERWRITING AGREEMENT
                             ----------------------



                                                                 August 12, 1999



PAINEWEBBER INCORPORATED
BANC OF AMERICA SECURITIES LLC
FIRST UNION CAPITAL MARKETS CORP.
SUNTRUST EQUITABLE SECURITIES CORPORATION
c/o PaineWebber Incorporated
1285 Avenue of the Americas
New York, New York  10019

Dear Sirs:

     ONEOK, Inc., an Oklahoma corporation (the "Company"), proposes to issue and
sell an aggregate of $300,000,000 principal amount of the Company's 7 3/4% Notes
Due August 15, 2006 (the "Securities") to be issued pursuant to an Indenture,
dated as of September 24, 1998, as amended or supplemented (the "Indenture"),
between the Company and Chase Bank of Texas, National Association, as Trustee
(the "Trustee").  The Securities will be sold to the underwriters named in
Schedule I (collectively, the "Underwriters").

     The purchase price for the Securities to be paid by the Underwriters shall
be agreed upon by the Company and the Underwriters, and such agreement shall be
set forth in a separate written instrument substantially in the form of Exhibit
A hereto (the "Price Determination Agreement"). The Price Determination
Agreement may take the form of an exchange of any standard form of written
telecommunication between the Company and the Underwriters and shall specify
such applicable information as is indicated in Exhibit A hereto.  The offering
of the Securities will be governed by this Agreement, as supplemented by the
Price Determination Agreement.  From and after the date of the execution and
delivery of the Price Determination Agreement, this Agreement shall be deemed to
incorporate, and, unless the context otherwise indicates, all references
contained herein to "this Agreement" and to the phrase "herein" shall be deemed
to include the Price Determination Agreement.

     The Company confirms as follows its agreements with the Underwriters.
<PAGE>

     1.   Agreement to Sell and Purchase.  On the basis of the representations,
          ------------------------------
warranties and agreements of the Company herein contained and subject to all the
terms and conditions of this Agreement, the Company agrees to sell to the
Underwriters, and the Underwriters agree to purchase from the Company, the
principal amount of the Securities, all at the purchase price to be agreed upon
by the Underwriters and the Company and set forth in the Price Determination
Agreement.

     2.   Delivery and Payment.  Delivery of the Securities shall be made to the
          --------------------
Underwriters against payment of the purchase price by wire transfers in
immediately available funds to an account specified by the Company.  Such
payment shall be made at 10:00 a.m., New York City time, on the third business
day after the date on which the first bona fide offering of the Securities to
the public is made by the Underwriters or at such time on such other date, not
later than 10 business days after such date as may be agreed upon by the Company
and the Underwriters (such date is hereinafter referred to as the "Closing
Date").  Delivery of the Securities shall be made through the facilities of the
Depository Trust Company unless the Underwriters shall otherwise instruct.

     3.   Representations and Warranties of the Company.  The Company
          ---------------------------------------------
represents, warrants and covenants to the Underwriters that:

          (a) The Company meets the requirements for use of Form S-3 and a
registration statement (Registration No. 333-76375) on Form S-3 relating to the
Securities including a preliminary prospectus and such amendments to such
registration statement as may have been required to the date of this Agreement,
has been prepared by the Company under the provisions of the Securities Act of
1933, as amended (the "Act"), and the rules and regulations (collectively
referred to as the "Rules and Regulations") of the Securities and Exchange
Commission (the "Commission") thereunder, and has been filed with the
Commission.  The term "preliminary prospectus" as used herein means a
preliminary prospectus as contemplated by Rule 430 or Rule 430A ("Rule 430A") of
the Rules and Regulations included at any time as part of the registration
statement.  Copies of such registration statement and amendments and of each
related preliminary prospectus have been delivered to the Underwriters.  The
term "Registration Statement" means the registration statement as amended at the
time it became effective (the "Effective Date"), including financial statements
and all exhibits and any information deemed to be included by Rule 430A or Rule
434 of the Rules and Regulations.  If the Company files a registration statement
to register a portion of the Securities and relies on Rule 462(b) of the Rules
and Regulations for such registration statement to become effective upon filing
with the Commission (the "Rule 462 Registration Statement"), then any reference
to the "Registration Statement" shall be deemed to include the Rule 462
Registration Statement, as amended from time to time.  The term "Prospectus"
means the prospectus as first filed with the Commission pursuant to Rule 424(b)
of the Rules and Regulations in connection with the offering of the Securities
and the form of final prospectus included in the Registration Statement at the
Effective Date.  Any reference herein to the Registration Statement, any
preliminary prospectus or the Prospectus shall be deemed to refer to and include
the documents incorporated by reference therein pursuant to Item 12 of Form S-3
that were filed under the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), on or before the Effective Date or the date of such preliminary
prospectus or the Prospectus, as the case may be.  Any reference herein to the
terms

                                       2
<PAGE>

"amend," "amendment" or "supplement" with respect to the Registration Statement,
any preliminary prospectus or the Prospectus shall be deemed to refer to and
include the filing of any document under the Exchange Act after the Effective
Date, or the date of any preliminary prospectus or the Prospectus, as the case
may be, and deemed to be incorporated therein by reference .

          (b) On the Effective Date, the date the Prospectus is first filed with
the Commission pursuant to Rule 424(b) (if required), at all times subsequent to
and including the Closing Date and when any post-effective amendment to the
Registration Statement becomes effective or any amendment or supplement to the
Prospectus is filed with the Commission, the Registration Statement and the
Prospectus (as amended or as supplemented if the Company shall have filed with
the Commission any amendment or supplement thereto), including the financial
statements included or incorporated by reference in the Prospectus, did or will
comply with the applicable provisions of the Act, the Exchange Act, the rules
and regulations thereunder (the "Exchange Act Rules and Regulations"), the Trust
Indenture Act of 1939, as amended (the "Trust Indenture Act"), the rules and
regulations thereunder (the "Trust Indenture Act Rules and Regulations") and the
Rules and Regulations and will contain all statements required to be stated
therein in accordance with the Act, the Exchange Act, the Exchange Act Rules and
Regulations and the Rules and Regulations.  On the Effective Date and when any
post-effective amendment to the Registration Statement becomes effective, no
part of the Registration Statement, or any such amendment did or will contain
any untrue statement of a material fact or omit to state a material fact
necessary to make the statements therein not misleading.  At the Effective Date,
the date the Prospectus or any amendment or supplement to the Prospectus is
filed with the Commission and at the Closing Date, the Prospectus did not or
will not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading.  The foregoing
representations and warranties in this Section 3(b) do not apply to any
statements or omissions made in reliance on and in conformity with information
relating to the Underwriters furnished in writing to the Company by the
Underwriters specifically for inclusion in the Registration Statement or
Prospectus or any amendment or supplement thereto.  For all purposes of this
Agreement, the amounts of the selling concession and reallowance set forth in
the Prospectus under the caption "Underwriting" constitute the only information
relating to the Underwriters furnished in writing to the Company by the
Underwriters specifically for inclusion in the Registration Statement or the
Prospectus.  The Company has not distributed any offering material in connection
with the offering or sale of the Securities other than the Registration
Statement, the preliminary prospectus, the Prospectus or any other materials, if
any, permitted by the Act.  On the Effective Date, the date the Prospectus is
first filed with the Commission pursuant to Rule 497 (if required), and at all
subsequent times to and including the Closing Date, the Indenture did or will
comply with all applicable provisions of the Trust Indenture Act and the Trust
Indenture Act Rules and Regulations.

          (c) The documents that are incorporated by reference in the Prospectus
or from which information is so incorporated by reference, when they become
effective or were filed with the Commission, as the case may be, complied in all
material respects with the requirements of the Act or the Exchange Act, as
applicable, the Exchange Act Rules and Regulations and the Rules and
Regulations; and any documents so filed and incorporated by reference subsequent
to

                                       3
<PAGE>

the date hereof shall, when they are filed with the Commission, conform in all
material respects with the requirements of the Act and the Exchange Act, as
applicable, the Exchange Act Rules and Regulations and the Rules and
Regulations.

          (d) The only subsidiaries (as defined in the Rules and Regulations) of
the Company are the subsidiaries named on Schedule II (the Subsidiaries").  The
Company and each of its Subsidiaries is, and at the Closing Date will be, a
corporation or limited liability company duly organized, validly existing and in
good standing under the laws of its jurisdiction of incorporation or
organization.  The Company and each of its Subsidiaries has, and at the Closing
Date will have, full power and authority to conduct all the activities conducted
by it, to own or lease all the assets owned or leased by it and to conduct its
business as described in the Registration Statement and the Prospectus.  The
Company and each of its Subsidiaries is, and at the Closing Date will be, duly
licensed or qualified to do business and in good standing as a foreign
corporation or limited liability company in all jurisdictions in which the
nature of the activities conducted by it or the character of the assets owned or
leased by it makes such licensing or qualification necessary, except to the
extent that the failure to so qualify or be in good standing would not have a
material adverse effect on the condition (financial or otherwise), earnings,
business affairs or business prospects of the Company and its Subsidiaries,
considered as one enterprise (a "Material Adverse Effect").  All of the
outstanding shares of capital stock or capital interests of the Subsidiaries
have been duly authorized and validly issued and are fully paid and non-
assessable and are owned by the Company free and clear of all liens,
encumbrances and claims whatsoever.  Except for the stock of or interests in the
Subsidiaries and as disclosed in the Registration Statement, the Company does
not own, and at the Closing Date will not own, directly or indirectly, any
shares of stock or any other equity or long-term debt securities of any
corporation or have any equity interest in any firm, partnership, joint venture,
association or other entity.  Complete and correct copies of the certificate of
incorporation, by-laws or other organizational documents of the Company and each
of its significant subsidiaries (as defined in Rule 1-02(w) of Regulation S-X of
the Rules and Regulations) and all amendments thereto have been delivered to the
Underwriters, and no changes therein will be made subsequent to the date hereof
and prior to the Closing Date.

          (e) The Securities have been duly and validly authorized and, when
authenticated by the Trustee and issued, delivered and sold in accordance with
this Agreement and the Indenture, will have been duly and validly executed,
authenticated, issued and delivered and will constitute valid and binding
obligations of the Company, enforceable against the Company in accordance with
their respective terms and entitled to the benefits provided by the Indenture.
At the Closing Date, the Company will have an authorized and outstanding
capitalization as set forth in the Prospectus.

          (f) The description of the Securities in the Registration Statement
and the Prospectus is, and at the Closing Date will be, complete and accurate in
all respects.  The Indenture conforms to the description thereof contained in
the Registration Statement and the Prospectus.

          (g) The financial statements and schedules included or incorporated by
reference in the Registration Statement or the Prospectus, and any amendment or
supplement

                                       4
<PAGE>

thereto, present fairly the consolidated financial condition of the Company or
Southwest Gas Corporation, a California corporation ("Southwest Gas"), as the
case may be, as of the respective dates thereof and the consolidated results of
operations and cash flows of the Company or Southwest Gas, as the case may be,
for the respective periods covered thereby, all in conformity with generally
accepted accounting principles applied on a consistent basis throughout the
entire period involved, except as otherwise disclosed in the Prospectus. The pro
forma financial statements and other pro forma financial information included in
the Registration Statement or the Prospectus (i) present fairly in all material
respects the information shown therein, (ii) have been prepared in accordance
with the Commission's rules and guidelines with respect to pro forma financial
statements and (iii) have been properly computed on the bases described therein.
The assumptions used in the preparation of the pro forma financial statements
and other pro forma financial information included or incorporated by reference
in the Registration Statement or the Prospectus are reasonable and the
adjustments used therein are appropriate to give effect to the transactions or
circumstances referred to therein. No other financial statements or schedules of
the Company or Southwest Gas are required by the Act, the Exchange Act or the
Rules and Regulations to be included in the Registration Statement or the
Prospectus. KPMG LLP and Arthur Andersen LLP (the "Accountants"), who have
reported on such financial statements and schedules, are independent accountants
with respect to the Company and Southwest Gas, respectively, as required by the
Act and the Rules and Regulations. There are no statements required to be
included in the Registration Statement or the Prospectus with respect to the
Accountants pursuant to Rule 509 of Regulation S-K of the Rules and Regulations.

          (h) The Company maintains a system of internal accountings control
sufficient to provide reasonable assurance that (i) transactions are executed in
accordance with management's general or specific authorization; (ii)
transactions are recorded as necessary to permit preparation of financial
statements in conformity with generally accepted accounting principles and to
maintain accountability for assets; (iii) access to assets is permitted only in
accordance with management's general or specific authorization; and (iv) the
recorded accountability for assets is compared with existing assets at
reasonable intervals and appropriate action is taken with respect to any
differences.

          (i) Subsequent to the respective dates as of which information is
given in the Registration Statement and the Prospectus and prior to the Closing
Date, except as set forth in or contemplated by the Registration Statement and
the Prospectus, (i) there has not been and will not have been any change in the
capitalization of the Company, or in the business, properties, business
prospects, condition (financial or otherwise) or results of operations of the
Company and its Subsidiaries, arising for any reason whatsoever, (ii) neither
the Company nor any of its Subsidiaries has incurred nor will it incur any
material liabilities or obligations, direct or contingent, nor has it entered
into nor will it enter into any material transactions other than pursuant to
this Agreement and the transactions referred to herein and (iii) the Company has
not and will not have paid or declared any dividends or other distributions of
any kind on any class of its capital stock, other than the ordinary quarterly
dividend paid or payable by the Company to holders of its common stock and
preferred stock consistent with past practices.

                                       5
<PAGE>

          (j) The Company is not an "investment company" or an "affiliated
person" of, or "promoter" or "principal underwriter" for, an "investment
company," as such terms are defined in the Investment Company Act of 1940, as
amended.

          (k) Except as set forth in the Registration Statement and the
Prospectus, there are no actions, suits or proceedings pending or threatened
against or affecting the Company or any of its Subsidiaries or any of their
respective directors or officers in their capacity as such, before or by any
Federal or state court, commission, regulatory body, administrative agency or
other governmental body, domestic or foreign, wherein an unfavorable ruling,
decision or finding might have a Material Adverse Effect.

          (l) The Company and each of its Subsidiaries has, and at the Closing
Date will have, (i) all governmental licenses, permits, consents, orders,
approvals and other authorizations (collectively, "Governmental Licenses")
necessary to carry on its business as contemplated in the Prospectus, except for
the Governmental Licenses the absence of which would not have a Material Adverse
Effect, (ii) complied in all material respects with all laws, regulations and
orders applicable to it or its business and (iii) performed all its material
obligations required to be performed by it, and is not, and at the Closing Date
will not be, in default, under any indenture, mortgage, deed of trust, voting
trust agreement, loan agreement, bond, debenture, note agreement, lease,
contract or other agreement or instrument (collectively, a "contract or other
agreement") to which it is a party or by which its property is bound or
affected, other than defaults that would not, individually or in the aggregate,
result in a Material Adverse Effect.  To the best knowledge of the Company and
each of its Subsidiaries, no other party under any contract or other agreement
to which it is a party is in material default in any respect thereunder. Neither
the Company nor any of its Subsidiaries is, nor at the Closing Date will any of
them be, in violation of any provision of its certificate of incorporation or
by-laws.

          (m) No consent, approval, authorization or order of, or any filing or
declaration with, any court or governmental agency or body is required in
connection with the authorization, issuance, transfer, sale or delivery of the
Securities by the Company, in connection with the execution, delivery and
performance of this Agreement by the Company or in connection with the taking by
the Company of any action contemplated hereby and in the Indenture and the
Securities, except such as have been obtained under the Act, the Trust Indenture
Act, the Trust Indenture Act Rules and Regulations or the Rules and Regulations
and such as may be required under state securities or Blue Sky laws or the by-
laws and rules of the National Association of Securities Dealers, Inc. (the
"NASD") in connection with the purchase and distribution by the Underwriters of
the Securities.

          (n) The Company has full corporate power and authority to enter into
this Agreement.  This Agreement has been duly authorized, executed and delivered
by the Company and constitutes a valid and binding agreement of the Company and
is enforceable against the Company in accordance with the terms hereof.  The
Indenture has been duly authorized and constitutes a valid and binding agreement
of the Company and is enforceable against the Company in accordance with its
terms.  The performance by the Company of this Agreement, the Indenture and the
Securities and the consummation of the transactions contemplated hereby and
thereby and the application of the net proceeds from the offering and sale of
the Securities to be sold by the

                                       6
<PAGE>

Company in the manner set forth in the Prospectus under "Use of Proceeds" will
not result in the creation or imposition of any lien, charge or encumbrance upon
any of the assets of the Company or any of its Subsidiaries pursuant to the
terms or provisions of, or result in a breach or violation of any of the terms
or provisions of, or constitute a default under, or give any other party a right
to terminate any of its obligations under, or result in the acceleration of any
obligation under, the certificate of incorporation or by-laws of the Company or
any of its Subsidiaries, any material contract or other agreement to which the
Company or any of its Subsidiaries is a party or by which the Company or any of
its Subsidiaries or any of its properties is bound or affected, or violate or
conflict with any judgment, ruling, decree, order, statute, rule or regulation
of any court or governmental agency or body applicable to the business or
properties of the Company or any of its Subsidiaries.

          (o) The Company and each of its Subsidiaries has good and marketable
title to all properties and assets described in the Prospectus as owned by it,
free and clear of all liens, charges, encumbrances or restrictions, except such
as are described in the Prospectus or are not material to the business of the
Company or its Subsidiaries.  The Company and each of its Subsidiaries has
valid, subsisting and enforceable leases for the properties described in the
Prospectus as leased by it, with such exceptions as are not material and do not
materially interfere with the use made and proposed to be made of such
properties by the Company and such Subsidiaries.

          (p) There is no document or contract of a character required to be
described in the Registration Statement or the Prospectus or to be filed as an
exhibit to the Registration Statement which is not described or filed as
required.  All such contracts to which the Company or any Subsidiary is a party
have been duly authorized, executed and delivered by the Company or such
Subsidiary, constitute valid and binding agreements of the Company or such
Subsidiary and are enforceable against the Company or such Subsidiary in
accordance with the terms thereof.

          (q) No statement, representation, warranty or covenant made by the
Company in this Agreement or the Indenture or made in any certificate or
document required by this Agreement to be delivered to the Underwriters was or
will be, when made, inaccurate, untrue or incorrect in any material respect.

          (r) Neither the Company nor any of its directors, officers or
controlling persons has taken, directly or indirectly, any action designed, or
which might reasonably be expected, to cause or result, under the Act or
otherwise, in, or which has constituted, stabilization or manipulation of the
price of any security of the Company to facilitate the sale or resale of the
Securities.

          (s) No holder of securities of the Company has rights to the
registration of any securities of the Company because of the filing of the
Registration Statement.

          (t) The Company and its Subsidiaries are in substantial compliance
with all federal, state and local employment and labor laws, including, but not
limited to, laws relating to non-discrimination in hiring, promotion and pay of
employees; no labor dispute with the employees of the Company or any Subsidiary
exists or, to the knowledge of the Company, is

                                       7
<PAGE>

imminent or threatened; and the Company is not aware of any existing, imminent
or threatened labor disturbance by the employees of any of its principal
suppliers, manufacturers or contractors that could result in a Material Adverse
Effect.

          (u) The Company and its Subsidiaries own, or are licensed or otherwise
have the full exclusive right to use, all material trademarks and trade names
which are used in or necessary for the conduct of their respective businesses as
described in the Prospectus.  No claims have been asserted by any person to the
use of any such trademarks or trade names or challenging or questioning the
validity or effectiveness of any such trademark or trade name.  The use, in
connection with the business and operations of the Company and its Subsidiaries
of such trademarks and trade names does not, to the Company's knowledge,
infringe on the rights of any person.

          (v) Neither the Company nor any of its Subsidiaries nor, to the
Company's knowledge, any employee or agent of the Company or any Subsidiary has
made any payment of funds of the Company or any Subsidiary or received or
retained any funds in violation of any law, rule or regulation or of a character
required to be disclosed in the Prospectus.

          (w) All United States federal income tax returns of the Company and
its Subsidiaries required by law to be filed have been filed, and all other
franchise and income tax returns of the Company and its Subsidiaries required to
be filed pursuant to applicable foreign, state or local law have been filed, and
all taxes shown by such returns or otherwise assessed, which are due and
payable, have been paid, except tax assessments, if any, as are being contested
in good faith and as to which adequate reserves have been provided.  The
charges, accruals and reserves on the books of the Company and its Subsidiaries
in respect of any income and corporate franchise tax liability for any years not
finally determined are adequate to meet any assessments or reassessments for
additional income or corporate franchise tax for any years not finally
determined.

          (x) The Company and its subsidiaries are implementing a comprehensive,
detailed program to analyze and address the risk that the computer hardware and
software used by them may be unable to recognize and properly execute date
sensitive functions involving certain dates prior to and any dates after
December 31, 1999 (the "Year 2000 Problem"), and reasonably believes that such
risk will be remedied on a timely basis without material expense and will not
have a Material Adverse Effect; and the Company believes, after due inquiry,
that each supplier, vendor, customer or financial service organization used or
serviced by the Company and its Subsidiaries has remedied or will remedy on a
timely basis the Year 2000 Problem, except to the extent that a failure to
remedy by any such supplier, vendor, customer or financial service organization
would not have a Material Adverse Effect.  The Company is in compliance with the
Commission's most recent staff legal bulletin related to Year 2000 compliance.

          (y) The Company and its Subsidiaries (i) are in compliance with any
and all applicable foreign, federal, state and local laws and regulations
relating to the protection of human health and safety, the environment or
imposing liability or standards of conduct concerning any Hazardous Material (as
hereinafter defined) ("Environmental Laws"), (ii) have received all permits,
licenses or other approvals required of them under applicable Environmental Laws
to

                                       8
<PAGE>

conduct their respective businesses and (iii) are in compliance with all terms
and conditions of any such permit, license or approval, except where such
noncompliance with Environmental Laws, failure to receive required permits,
licenses or other approvals or failure to comply with the terms and conditions
of such permits, licenses or approvals would not, individually or in the
aggregate, result in a Material Adverse Effect. The term "Hazardous Material"
means (A) any "hazardous substance" as defined by the Comprehensive
Environmental Response, Compensation and Liability Act of 1980, as amended, (B)
any "hazardous waste" as defined by the Resource Conservation and Recovery Act,
as amended, (C) any petroleum or petroleum product, (D) any polychlorinated
biphenyl and (E) any pollutant or contaminant or hazardous, dangerous, or toxic
chemical, material, waste or substance regulated under or within the meaning of
any other Environmental Law.

          (z)   In the ordinary course of its business, the Company conducts a
periodic review of the effect of Environmental Laws on the business, operations
and properties of the Company and its Subsidiaries, in the course of which it
identifies and evaluates associated costs and liabilities (including, without
limitation, any capital or operating expenditures required for clean-up, closure
of properties or compliance with Environmental Laws or any permit, license or
approval, any related constraints on operating activities and any potential
liabilities to third parties).  Except as set forth in the Registration
Statement and the Prospectus, there are no costs and liabilities associated with
or arising in connection with Environmental Laws as currently in effect
(including, without limitation, costs of compliance therewith) which would,
singly or in the aggregate have a Material Adverse Effect.

          (aa)  The Company maintains insurance with respect to its properties
and business of the types and in amounts generally deemed adequate for its
business and consistent with insurance coverage maintained by similar companies
and businesses, all of which insurance is in full force and effect.

          (bb)  With respect to each employee benefit plan, program and
arrangement (including, without limitation, any "employee benefit plan" as
defined in Section 3(3) of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA")) maintained or contributed to by the Company, or with
respect to which the Company could incur any liability under ERISA
(collectively, the "Benefit Plans"), no event has occurred and, to the best
knowledge of the Company, there exists no condition or set of circumstances, in
connection with which the Company could be subject to any liability under the
terms of such Benefit Plan, applicable law (including, without limitation, ERISA
and the Internal Revenue Code of 1986, as amended) or any applicable agreement
that could have a Material Adverse Effect.

     4.   Agreements of the Company.  The Company agrees with the Underwriters
          -------------------------
as follows:

          (a) The Company will not, during such period as the Prospectus is
required by law to be delivered in connection with sales of the Securities by
the Underwriters or a dealer, file any amendment or supplement to the
Registration Statement or the Prospectus, unless a copy thereof shall first have
been submitted to the Underwriters within a reasonable period of time prior to
the filing thereof and the Underwriters shall not have objected thereto in good
faith.

                                       9
<PAGE>

          (b) The Company will notify the Underwriters promptly, and will
confirm such advice in writing, (i) when any post-effective amendment to the
Registration Statement becomes effective, (ii) of any request by the Commission
for amendments or supplements to the Registration Statement or the Prospectus or
for additional information, (iii) of the issuance by the Commission of any stop
order suspending the effectiveness of the Registration Statement or the
initiation of any proceedings for that purpose or the threat thereof, (iv) of
the happening of any event during the period mentioned in the second sentence of
Section 4(e) that in the judgment of the Company makes any statement made in the
Registration Statement or the Prospectus untrue or that requires the making of
any changes in the Registration Statement or the Prospectus in order to make the
statements therein, in the light of the circumstances in which they are made,
not misleading and (v) of receipt by the Company or any representative or
attorney of the Company of any other communication from the Commission relating
to the Company, the Registration Statement, any preliminary prospectus or the
Prospectus.  If at any time the Commission shall issue any order suspending the
effectiveness of the Registration Statement, the Company will make every
reasonable effort to obtain the withdrawal of such order at the earliest
possible moment.  The Company will use its best efforts to comply with the
provisions of and make all requisite filings with the Commission pursuant to
Rule 430A and to notify the Underwriters promptly of all such filings.

          (c) The Company has furnished, or will furnish, to the Underwriters,
without charge, two conformed copies of the Registration Statement and of any
post-effective amendment thereto, including financial statements and schedules,
and all exhibits thereto (including any document filed under the Exchange Act
and deemed to be incorporated by reference into the Prospectus).

          (d) The Company will comply with all the provisions of any
undertakings contained in the Registration Statement.

          (e) On the Effective Date, and thereafter from time to time, the
Company will deliver to the Underwriters, without charge, as many copies of the
Prospectus or any amendment or supplement thereto, as the Underwriters may
reasonably request.  The Company consents to the use of the Prospectus or any
amendment or supplement thereto by the Underwriters and by all dealers to whom
the Securities may be sold, both in connection with the offering or sale of the
Securities and for any period of time thereafter during which the Prospectus is
required by law to be delivered in connection therewith.  If during such period
of time any event shall occur that in the judgment of the Company or counsel to
the Underwriters should be set forth in the Prospectus in order to make any
statement therein, in the light of the circumstances under which it was made,
not misleading, or if it is necessary to supplement or amend the Prospectus to
comply with law, the Company will forthwith prepare and duly file with the
Commission an appropriate supplement or amendment thereto, and will deliver to
the Underwriters, without charge, such number of copies thereof as the
Underwriters may reasonably request.  The Company shall not file any document
under the Exchange Act before the termination of the offering of the Securities
by the Underwriters if such document would be deemed to be incorporated by
reference into the Prospectus and if such document is not approved by the
Underwriters after reasonable notice thereof.

                                       10
<PAGE>

          (f) Prior to any public offering of the Securities by the
Underwriters, the Company will cooperate with the Underwriters and the
Underwriters' counsel in connection with the registration or qualification of
the Securities for offer and sale under the securities or Blue Sky laws of such
jurisdictions as the Underwriters may request; provided, that in no event shall
the Company be obligated to qualify to do business in any jurisdiction where it
is not now so qualified or to take any action which would subject it to general
service of process in any jurisdiction where it is not now so subject.

          (g) During the period of five years commencing on the date of the
Price Determination Agreement, the Company will furnish to the Underwriters
copies of such financial statements and other periodic and special reports as
the Company may from time to time distribute generally to the holders of any
class of its capital stock, and will furnish to the Underwriters a copy of each
annual or other report it shall be required to file with the Commission.

          (h) The Company will make generally available to holders of its
securities as soon as may be practicable but in no event later than the last day
of the fifteenth full calendar month following the calendar quarter in which the
"effective date of the Registration Statement" (as defined in Rule 158 of the
Rules and Regulations) falls, an earnings statement (which need not be audited
but shall be in reasonable detail) for a period of 12 months ended commencing
after such "effective date of the Registration Statement," and satisfying the
provisions of Section 11(a) of the Act (including Rule 158 of the Rules and
Regulations).

          (i) Whether or not the transactions contemplated by this Agreement are
consummated or this Agreement is terminated, the Company will pay, or reimburse
if paid by the Underwriters, all costs and expenses incident to the performance
of the obligations of the Company under this Agreement, including but not
limited to costs and expenses of or relating to (i) the preparation, printing
and filing of the Registration Statement and exhibits to it, each preliminary
prospectus, the Prospectus, any amendment or supplement to the Registration
Statement or the Prospectus and the Indenture, (ii) the preparation and delivery
of certificates representing the Securities, (iii) the printing of this
Agreement and any Dealer Agreements, (iv) furnishing (including costs of
shipping, mailing and courier) such copies of the Registration Statement, the
Prospectus and any preliminary prospectus, and all amendments and supplements
thereto, as may be requested for use in connection with the offering and sale of
the Securities by the Underwriters or by dealers to whom Securities may be sold,
(v) any filings required to be made by the Underwriters with the NASD, and the
fees, disbursements and other charges of counsel for the Underwriters in
connection therewith, (vi) the registration or qualification of the Securities
for offer and sale under the securities or Blue Sky laws of such jurisdictions
designated pursuant to Section 4(f), including the fees, disbursements and other
charges of counsel to the Underwriters in connection therewith, and the
preparation and printing of preliminary, supplemental and final Blue Sky
memoranda, (vii) counsel to the Company, (viii) the transfer agent and registrar
for the Securities, (ix) the rating of the Securities by one or more rating
agencies, (x) the Trustee and any agent of the Trustee and the fees,
disbursements and other charges of counsel for the Trustee in connection with
the Indenture and the Securities and (xi) the Accountants.  Except as otherwise
provided in this Section 4, the Underwriters shall pay all of their own costs
and expenses.

                                       11
<PAGE>

          (j) If this Agreement shall be terminated by the Company pursuant to
any of the provisions hereof or if for any reason the Company shall be unable to
perform its obligations hereunder, the Company will reimburse the Underwriters
for all out-of-pocket expenses (including the fees, disbursements and other
charges of counsel to the Underwriters) reasonably incurred by it in connection
herewith.

          (k) The Company will not at any time, directly or indirectly, take any
action intended, or that might reasonably be expected, to cause or result in, or
which will constitute, stabilization of the price of the Securities to
facilitate the sale or resale of any of the Securities.

          (l) The Company will apply the net proceeds from the offering and sale
of the Securities in the manner set forth in the Prospectus under "Use of
Proceeds."

          (m) The Company will not claim the benefit of any usury law against
any holders of Securities.

     5.   Conditions of Obligations of the Underwriters.  In addition to the
          ---------------------------------------------
execution and delivery of the Price Determination Agreement, the obligations of
the Underwriters hereunder are subject to the following conditions:

          (a) (i) No stop order suspending the effectiveness of the Registration
Statement shall have been issued and no proceedings for that purpose shall be
pending or threatened by the Commission, (ii) no order suspending the
effectiveness of the Registration Statement or the qualification or registration
of the Securities under the securities or Blue Sky laws of any jurisdiction
shall be in effect and no proceeding for such purpose shall be pending before or
threatened or contemplated by the Commission or the authorities of any such
jurisdiction, (iii) any request for additional information on the part of the
staff of the Commission or any such authorities shall have been complied with to
the satisfaction of the staff of the Commission or such authorities and (iv)
after the date hereof no amendment or supplement to the Registration Statement
or the Prospectus shall have been filed unless a copy thereof was first
submitted to the Underwriters and the Underwriters did not object thereto in
good faith, and the Underwriters shall have received certificates, dated the
Closing Date and signed by the Chief Executive Officer, President or a Vice
President of the Company and the Chief Financial Officer of the Company (who
may, as to proceedings threatened, rely upon the best of their information and
belief), to the effect of clauses (i), (ii) and (iii).

          (b) Since the respective dates as of which information is given in the
Registration Statement and the Prospectus (i) there shall not have been a
material adverse change in the general affairs, business, business prospects,
properties, management, condition (financial or otherwise) or results of
operations of the Company and its Subsidiaries, taken as a whole, whether or not
arising from transactions in the ordinary course of business, in each case other
than as set forth in or contemplated by the Registration Statement and the
Prospectus, and (ii) neither the Company nor any of its Subsidiaries shall have
sustained any material loss or interference with its business or properties from
fire, explosion, flood or other casualty, whether or not covered by insurance,
or from any labor dispute or any court or legislative or other governmental
action, order or decree, which is not set forth in the Registration Statement
and the Prospectus, if in your

                                       12
<PAGE>

judgment any such development makes it impracticable or inadvisable to
consummate the sale and delivery of the Securities by the Underwriters in
accordance with the terms hereof and thereof .

          (c) Since the respective dates as of which information is given in the
Registration Statement and the Prospectus, there shall have been no litigation
or other proceeding instituted against the Company or any of its Subsidiaries or
any of their respective officers or directors in their capacities as such,
before or by any Federal, state or local court, commission, regulatory body,
administrative agency or other governmental body, domestic or foreign, in which
litigation or proceeding an unfavorable ruling, decision or finding would
materially and adversely affect the business, properties, business prospects,
condition (financial or otherwise) or results of operations of the Company and
its Subsidiaries taken as a whole.

          (d) Each of the representations and warranties of the Company
contained herein shall be true and correct in all material respects at the
Closing Date, as if made and all covenants and agreements herein contained to be
performed on the part of the Company and all conditions herein contained to be
fulfilled or complied with by the Company at or prior to the Closing Date shall
have been duly performed, fulfilled or complied with.

          (e) The Underwriters shall have received opinions, each dated the
Closing Date and satisfactory in form and substance to counsel to the
Underwriters, from Gable & Gotwals, counsel to the Company, to the effect set
forth in Exhibit B and Andersen, Byrd, Richeson, Flaherty and Henrichs, special
counsel to the Company.

          (f) The Underwriters shall have received an opinion, dated the Closing
Date from Jones, Day, Reavis & Pogue, counsel to the Underwriters, with respect
to the Registration Statement, the Prospectus and this Agreement, which opinion
shall be satisfactory in all respects to the Underwriters.

          (g) On the date of the Price Determination Agreement, the Accountants
shall have furnished to the Underwriters letters, each dated the date of its
delivery, addressed to the Underwriters and in form and substance satisfactory
to the Underwriters, confirming that they are independent accountants with
respect to the Company or Southwest Gas, as the case may be, as required by the
Act and the Rules and Regulations and with respect to the financial and other
statistical and numerical information contained or incorporated by reference in
the Registration Statement.  At the Closing Date, the Accountants shall have
furnished to the Underwriters letters, each dated the date of its delivery,
which shall confirm, on the basis of a review in accordance with the procedures
set forth in the respective letters from the Accountants, that nothing has come
to their attention during the period from the date of the letter referred to in
the prior sentence to a date (specified in the letter) not more than five days
prior to the Closing Date that would require any change in their letter dated
the date of the Price Determination Agreement, if it were required to be dated
and delivered at the Closing Date.

          (h) At the Closing Date, there shall be furnished to the Underwriters
an accurate certificate, dated the date of its delivery, signed by each of the
Chief Executive Officer, President or a Vice President and the Chief Financial
Officer of the Company, in form and substance satisfactory to the Underwriters,
to the effect that:

                                       13
<PAGE>

          (i)   Each signer of such certificate has carefully examined the
Registration Statement and the Prospectus (including any documents filed under
the Exchange Act and deemed to be incorporated by reference into the Prospectus)
and (A) as of the date of such certificate, such documents are true and correct
in all material respects and do not omit to state a material fact required to be
stated therein or necessary in order to make the statements therein not untrue
or misleading and (B) since the Effective Date, no event has occurred as a
result of which it is necessary to amend or supplement the Prospectus in order
to make the statements therein not untrue or misleading in any material respect
and there has been no document required to be filed under the Exchange Act and
the Exchange Act Rules and Regulations that upon such filing would be deemed to
be incorporated by reference into the Prospectus that has not been so filed.

          (ii)  Each of the representations and warranties of the Company
contained in this Agreement were, when originally made, and are, at the time
such certificate is delivered, true and correct in all material respects.

          (ii)  Each of the covenants required herein to be performed by the
Company on or prior to the delivery of such certificate has been duly, timely
and fully performed and each condition herein required to be complied with by
the Company on or prior to the date of such certificate has been duly, timely
and fully complied with.

     (i)  The Securities shall be qualified for sale in such states as the
Underwriters may reasonably request, each such qualification shall be in effect
and not subject to any stop order or other proceeding on the Closing Date.

     (j)  Subsequent to the execution and delivery of this Agreement and prior
to the Closing Date, there shall not have been any downgrading, nor any notice
given of any intended or potential downgrading or of a possible change that does
not indicate the direction of the possible change, in the rating accorded any of
the Company's securities, including the Securities, by any "nationally
recognized statistical rating organization," as such term is defined for
purposes of Rule 436(g)(2) under the Act.

     (k)  The Company shall have furnished to the Underwriters such
certificates, in addition to those specifically mentioned herein, as the
Underwriters may have reasonably requested as to the accuracy and completeness
at the Closing Date of any statement in the Registration Statement or the
Prospectus or any documents filed under the Exchange Act and deemed to be
incorporated by reference into the Prospectus, as to the accuracy at the Closing
Date of the representations and warranties of the Company herein, as to the
performance by the Company of its obligations hereunder, or as to the
fulfillment of the conditions concurrent and precedent to the obligations
hereunder of the Underwriters.

  6. Indemnification.
     ---------------

     (a) The Company will indemnify and hold harmless the Underwriters, the
directors, officers, employees and agents of the Underwriters and each person,
if any, who controls any such Underwriter within the meaning of Section 15 of
the Act or Section 20 of the

                                       14
<PAGE>

Exchange Act from and against any and all losses, claims, liabilities, expenses
and damages (including, but not limited to, any and all investigative, legal and
other expenses reasonably incurred in connection with, and any and all amounts
paid in settlement of, any action, suit or proceeding between any of the
indemnified parties and any indemnifying parties or between any indemnified
party and any third party, or otherwise, or any claim asserted), as and when
incurred, to which any Underwriter, or any such person, may become subject under
the Act, the Exchange Act or other Federal or state statutory law or regulation,
at common law or otherwise, insofar as such losses, claims, liabilities,
expenses or damages arise out of or are based on (i) any untrue statement or
alleged untrue statement of a material fact contained in any preliminary
prospectus, the Registration Statement or the Prospectus or any amendment or
supplement to the Registration Statement or the Prospectus or in any documents
filed under the Exchange Act and deemed to be incorporated by reference into the
Prospectus by or on behalf of the Company or based on written information
furnished by or on behalf of the Company filed in any jurisdiction in order to
qualify the Securities under the securities laws thereof or filed with the
Commission, (ii) the omission or alleged omission to state in such document a
material fact required to be stated in it or necessary to make the statements in
it not misleading or (iii) any act or failure to act or any alleged act or
failure to act by any Underwriter in connection with, or relating in any manner
to, the Securities or the offering contemplated hereby, and which is included as
part of or referred to in any loss, claim, liability, expense or damage arising
out of or based upon matters covered by clause (i) or (ii) above (provided that
the Company shall not be liable under this clause (iii) to the extent it is
finally judicially determined by a court of competent jurisdiction that such
loss, claim, liability, expense or damage resulted directly from any such acts
or failures to act undertaken or omitted to be taken by such underwriter through
its gross negligence or willful misconduct); provided that the Company will not
be liable to the extent that such loss, claim, liability, expense or damage
arises from the sale of the Securities in the public offering to any person by
such Underwriter and is based on an untrue statement or omission or alleged
untrue statement or omission made in reliance on and in conformity with
information relating to the Underwriters furnished in writing to the Company by
the Underwriters expressly for inclusion in the Registration Statement, any
preliminary prospectus or the Prospectus. This indemnity agreement will be in
addition to any liability that the Company might otherwise have.

          (b) The Underwriters will, severally and not jointly, indemnify and
hold harmless the Company, each person, if any, who controls the Company within
the meaning of Section 15 of the Act or Section 20 of the Exchange Act, each
director of the Company and each officer of the Company who signs the
Registration Statement to the same extent as the foregoing indemnity from the
Company to the Underwriters, but only insofar as losses, claims, liabilities,
expenses or damages arise out of or are based on any untrue statement or
omission or alleged untrue statement or omission made in reliance on and in
conformity with written information relating to the Underwriters furnished in
writing to the Company by the Underwriters expressly for use in the Registration
Statement, any preliminary prospectus or the Prospectus.  This indemnity
agreement will be in addition to any liability that the Underwriters may
otherwise have; provided, however, that in no case shall any Underwriter be
liable or responsible for any amount in excess of the underwriting discounts and
commissions received by such Underwriter.

          (c) Any party that proposes to assert the right to be indemnified
under this Section 6 will, promptly after receipt of notice of commencement of
any action against such party

                                       15
<PAGE>

in respect of which a claim is to be made against an indemnifying party or
parties under this Section 6, notify each such indemnifying party of the
commencement of such action, enclosing a copy of all papers served, but the
omission so to notify such indemnifying party will not relieve it from any
liability that it may have to any indemnified party under the foregoing
provisions of this Section 6 unless, and only to the extent that, such omission
results in the forfeiture of substantive rights or defenses by the indemnifying
party. If any such action is brought against any indemnified party and it
notifies the indemnifying party of its commencement, the indemnifying party will
be entitled to participate in and, to the extent that it elects by delivering
written notice to the indemnified party promptly after receiving notice of the
commencement of the action from the indemnified party to assume the defense of
the action, with counsel satisfactory to the indemnified party, and after notice
from the indemnifying party to the indemnified party of its election to assume
the defense, the indemnifying party will not be liable to the indemnified party
for any legal or other expenses except as provided below and except for the
reasonable costs of investigation subsequently incurred by the indemnified party
in connection with the defense. The indemnified party will have the right to
employ its own counsel in any such action, but the fees, expenses and other
charges of such counsel will be at the expense of such indemnified party unless
(i) the employment of counsel by the indemnified party has been authorized in
writing by the indemnifying party, (ii) the indemnified party has reasonably
concluded (based on advice of counsel) that there may be legal defenses
available to it or other indemnified parties that are different from or in
addition to those available to the indemnifying party, (iii) a conflict or
potential conflict exists (based on advice of counsel to the indemnified party)
between the indemnified party and the indemnifying party (in which case the
indemnifying party will not have the right to direct the defense of such action
on behalf of the indemnified party) or (iv) the indemnifying party has not in
fact employed counsel to assume the defense of such action within a reasonable
time after receiving notice of the commencement of the action, in each of which
cases the reasonable fees, disbursements and other charges of counsel will be at
the expense of the indemnifying party or parties. It is understood that the
indemnifying party shall not, in connection with any proceeding or related
proceedings in the same jurisdiction, be liable for the reasonable fees,
disbursements and other charges of more than one separate firm admitted to
practice in such jurisdiction at any one time for all such indemnified party or
parties. All such fees, disbursements and other charges will be reimbursed by
the indemnifying party promptly as they are incurred. An indemnifying party will
not be liable for any settlement of any action or claim effected without its
written consent (which consent will not be unreasonably withheld). No
indemnifying party shall, without the prior written consent of each indemnified
party, settle or compromise or consent to the entry of any judgment in any
pending or threatened claim, action or proceeding relating to the matters
contemplated by this Section 6 (whether or not any indemnified party is a party
thereto), unless such settlement, compromise or consent includes an
unconditional release of each indemnified party from all liability arising or
that may arise out of such claim, action or proceeding. Notwithstanding any
other provision of this Section 6(c), if at any time an indemnified party shall
have requested an indemnifying party to reimburse the indemnified party for fees
and expenses of counsel, such indemnifying party agrees that it shall be liable
for any settlement effected without its written consent if (1) such settlement
is entered into more than 45 days after receipt by such indemnifying party of
the aforesaid request, (2) such indemnifying party shall have received notice of
the terms of such settlement at least 30 days prior to such settlement being
entered into and (3) such indemnifying party shall not have reimbursed such
indemnified party in accordance with such request prior to the date of such
settlement.

                                       16
<PAGE>

          (d) In order to provide for just and equitable contribution in
circumstances in which the indemnification provided for in the foregoing
paragraphs of this Section 6 is applicable in accordance with its terms but for
any reason is held to be unavailable from the Company or the Underwriters, the
Company and the Underwriters shall contribute to the total losses, claims,
liabilities, expenses and damages (including any investigative, legal and other
expenses reasonably incurred in connection with, and any amount paid in
settlement of, any action, suit or proceeding or any claim asserted, but after
deducting any contribution received by the Company from persons other than the
Underwriters, such as persons who control the Company within the meaning of the
Act, officers of the Company who signed the Registration Statement and directors
of the Company, who also may be liable for contribution) to which the Company
and the Underwriters may be subject in such proportion as shall be appropriate
to reflect the relative benefits received by the Company on the one hand and the
Underwriters on the other.  The relative benefits received by the Company on the
one hand and the Underwriters on the other shall be deemed to be in the same
proportion as the total net proceeds from the offering (before deducting
expenses) received by the Company bear to the total underwriting discounts and
commissions received by the Underwriters, respectively, in each case as
described in the Prospectus.  If, but only if, the allocation provided by the
foregoing sentence is not permitted by applicable law, the allocation of
contribution shall be made in such proportion as is appropriate to reflect not
only the relative benefits referred to in the foregoing sentence but also the
relative fault of the Company, on the one hand, and the Underwriters, on the
other, with respect to the statements or omissions that resulted in such loss,
claim, liability, expense or damage, or action in respect thereof, as well as
any other relevant equitable considerations with respect to such offering.  Such
relative fault shall be determined by reference to whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact related to information supplied by the Company or the
Underwriters, the intent of the parties and their relative knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The Company and the Underwriters agree that it would not be just and equitable
if contributions pursuant to this Section 6(d) were to be determined by pro rata
allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation which does not take into account
the equitable considerations referred to herein.  The amount paid or payable by
an indemnified party as a result of the loss, claim, liability, expense or
damage, or action in respect thereof, referred to above in this Section 6(d)
shall be deemed to include, for purpose of this Section 6(d), any legal or other
expenses reasonably incurred by such indemnified party in connection with
investigating or defending any such action or claim.  Notwithstanding the
provisions of this Section 6(d), no Underwriter shall be required to contribute
any amount in excess of the underwriting discounts and commissions received by
it and no person found guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Act) will be entitled to contribution from any
person who was not guilty of such fraudulent misrepresentation.  The
Underwriters' obligations to contribute as provided in this Section 6(d) are
several in proportion to their respective underwriting obligations and not
joint.  For purposes of this Section 6(d), any person who controls a party to
this Agreement within the meaning of the Act will have the same rights to
contribution as that party, and each officer of the Company who signed the
Registration Statement will have the same rights to contribution as the Company,
subject in each case to the provisions hereof.  Any party entitled to
contribution, promptly after receipt of notice of commencement of any action
against such party in respect of which a claim for contribution may be made
under this Section 6(d), will notify any such party or parties from whom
contribution

                                       17
<PAGE>

may be sought, but the omission so to notify will not relieve the party or
parties from whom contribution may be sought from any other obligation it or
they may have under this Section 6(d). Except for a settlement entered into
pursuant to the last sentence of Section 6(c) hereof, no party will be liable
for contribution with respect to any action or claim settled without its written
consent (which consent will not be unreasonably withheld).

          (e) The indemnity and contribution agreements contained in this
Section 6 and the representations and warranties of the Company contained in
this Agreement shall remain operative and in full force and effect regardless of
(i) any investigation made by or on behalf of the Underwriters, (ii) acceptance
of any of the Securities and payment therefor or (iii) any termination of this
Agreement.

     7.   Termination.  The obligations of the Underwriters under this Agreement
          -----------
may be terminated at any time on or prior to the Closing Date by notice to the
Company from the Underwriters, without liability on the part of any Underwriter
to the Company, if, prior to delivery and payment for the Securities in the sole
judgment of the Underwriters, (a) trading in securities generally on the New
York Stock Exchange shall have been suspended or limited or minimum or maximum
prices shall have been generally established on such exchange, or additional
material governmental restrictions, not in force on the date of this Agreement,
shall have been imposed upon trading in securities generally by such exchange or
by order of the Commission or any court or other governmental authority, (b) a
general banking moratorium shall have been declared by either Federal or New
York State authorities or (c) any material adverse change in the financial or
securities markets in the United States or in political, financial or economic
conditions in the United States or any outbreak or material escalation of
hostilities or declaration by the United States of a national emergency or war
or other calamity or crisis shall have occurred the effect of any of which is
such as to make it, in the sole judgment of the Underwriters, impracticable or
inadvisable to market the Securities on the terms and in the manner contemplated
by the Prospectus.

     8.   Substitution of Underwriters.  If any one or more of the Underwriters
          ----------------------------
shall fail or refuse to purchase any of the Securities that it or they have
agreed to purchase hereunder, and the aggregate principal amount of Securities
that such defaulting Underwriter or Underwriters agreed but failed or refused to
purchase is not more than one-tenth of the aggregate principal amount of
Securities, the other Underwriters shall be obligated, severally, to purchase
the Securities that such defaulting Underwriter or Underwriters agreed but
failed or refused to purchase, in the proportions that the principal amount of
Securities that they have respectively agreed to purchase pursuant to Section 1
bears to the aggregate principal amount of Securities that all such non-
defaulting Underwriters have so agreed to purchase, or in such other proportions
as the non-defaulting Underwriters may specify; provided that in no event shall
the maximum principal amount of Securities that any Underwriter has become
obligated to purchase pursuant to Section 1 be increased pursuant to this
Section 8 by more than one-ninth of the principal amount of Securities agreed to
be purchased by such Underwriter without the prior written consent of such
Underwriter. If any Underwriter or Underwriters shall fail or refuse to purchase
any Securities and the aggregate principal amount of Securities that such
defaulting Underwriter or Underwriters agreed but failed or refused to purchase
exceeds one-tenth of the aggregate principal amount of the Securities and
arrangements satisfactory to the non-defaulting

                                       18
<PAGE>

Underwriters and the Company for the purchase of such Securities are not made
within 48 hours after such default, this Agreement will terminate without
liability on the part of any non-defaulting Underwriter or the Company for the
purchase or sale of any Securities under this Agreement. In any such case either
the non-defaulting Underwriters or the Company shall have the right to postpone
the Closing Date, but in no event for longer than seven days, in order that the
required changes, if any, in the Registration Statement and in the Prospectus or
in any other documents or arrangements may be effected. Any action taken
pursuant to this Section 8 shall not relieve any defaulting Underwriter from
liability in respect of any default of such Underwriter under this Agreement.

     9.   Miscellaneous.  Notice given pursuant to any of the provisions of this
          -------------
Agreement shall be in writing and, unless otherwise specified, shall be mailed
or delivered (a) if to the Company, at the office of the Company, 100 West Fifth
Street, Tulsa, Oklahoma 74103, Attention: Chief Financial Officer or (b) if to
the Underwriters, at the offices of PaineWebber Incorporated, 1285 Avenue of the
Americas, New York, New York 10019, Attention:  Corporate Finance Department.
Any such notice shall be effective only upon receipt.  Any notice under Section
7 may be made by telex or telephone, but if so made shall be subsequently
confirmed in writing.

     This Agreement has been and is made solely for the benefit of the
Underwriters and the Company and of the controlling persons, directors and
officers referred to in Section 6, and their respective successors and assigns,
and no other person shall acquire or have any right under or by virtue of this
Agreement.  The term "successors and assigns" as used in this Agreement shall
not include a purchaser, as such purchaser, of Securities from the Underwriters.

     All representations, warranties and agreements of the Company contained
herein or in certificates or other instruments delivered pursuant hereto, shall
remain operative and in full force and effect regardless of any investigation
made by or on behalf of any Underwriter or any of their controlling persons and
shall survive delivery of and payment for the Securities hereunder.

     THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO THE CONFLICT OF LAWS PRINCIPLES
OF SUCH STATE.

     This Agreement may be signed in two or more counterparts with the same
effect as if the signatures thereto and hereto were upon the same instrument.
In case any provision in this Agreement shall be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

     The Company and the Underwriters each hereby irrevocably waive any right
they may have to trial by jury in respect of any claim based upon or arising out
of this Agreement or the transactions contemplated hereby.

     This Agreement may not be amended or otherwise modified or any provision
hereof waived except by an instrument in writing signed by the Underwriters and
the Company.

                                       19
<PAGE>

     Please confirm that the foregoing correctly sets forth the agreement
between the Company and the Underwriters.

                                  Very truly yours,

                                  ONEOK, INC.


                                  By:   /s/ James C. Kneale
                                       -------------------------------------
                                  Name:   James C. Kneale
                                  Title:  Vice President and Chief Financial
                                          Officer


Confirmed as of the date first
above mentioned:

PAINEWEBBER INCORPORATED
BANC OF AMERICA SECURITIES LLC
FIRST UNION CAPITAL MARKETS CORP.
SUNTRUST EQUITABLE SECURITIES CORPORATION

By:  PAINEWEBBER INCORPORATED


By:  /s/ Peter Masco
    ----------------------------
Name:    Peter Masco
Title:   Managing Director

                                       20
<PAGE>

                                  SCHEDULE I

                                 UNDERWRITERS


                                             Principal Amount
Underwriter                                    of Securities
- -----------                                  ----------------

PaineWebber Incorporated...................   $ 85,000,000
Banc of America Securities LLC.............     85,000,000
First Union Capital Markets Corp...........     85,000,000
SunTrust Equitable Securities Corporation..     45,000,000
                                              ------------

            Total..........................   $300,000,000
                                              ============

<PAGE>

                                  SCHEDULE II

                          SUBSIDIARIES OF THE COMPANY


                                                      State of
                                                    Incorporation
Subsidiary                                         or Organization
- ----------                                         ---------------

Kansas Gas Marketing Company...................         Kansas
Kansas Gas Service Company.....................         Kansas
ONEOK Gas Storage, L.L.C.......................         Delaware
ONEOK Technology Company.......................         Delaware
Oklahoma Natural Energy Service Company........         Oklahoma
OkTex Pipeline Company.........................         Delaware
ONEOK Resources Company........................         Delaware
ONEOK Service Company..........................         Oklahoma
ONEOK Gas Processing, L.L.C....................         Oklahoma
ONEOK Gas Transportation, L.L.C................         Oklahoma
ONEOK International, Inc.......................         Delaware
ONEOK Producer Services, L.L.C.................         Oklahoma
ONEOK Gas Marketing Company....................         Delaware
Market Center Gathering, Inc. (A subsidiary of
  Mid Continent Market Center, Inc.)...........         Kansas
Mid Continent Market Center, Inc...............         Kansas
ONEOK Power Marketing Company..................         Delaware
Fifth Street Investment Corporation............         Oklahoma
ONEOK Leasing Company..........................         Delaware
ONEOK Parking Company..........................         Delaware
ONEOK Financing Company........................         Kansas
Mid Continent Transportation, Inc..............         Kansas
ONEOK Field Services Company...................         Oklahoma
ONEOK Field Services Gathering, L.L.C..........         Oklahoma
ONEOK Field Services Transmission, L.L.C.......         Oklahoma
ONEOK Field Services Processing, L.L.C.........         Oklahoma
ONEOK Capital Trust I..........................         Delaware
ONEOK Capital Trust II.........................         Delaware
Mid Continent Transportation, Inc..............         Delaware
ONEOK Technology Company.......................         Delaware
<PAGE>

                                                                       EXHIBIT A



                                  ONEOK, INC.



                         PRICE DETERMINATION AGREEMENT
                         -----------------------------


                                                                 August 12, 1999



PAINEWEBBER INCORPORATED
BANC OF AMERICA SECURITIES LLC
FIRST UNION CAPITAL MARKETS CORP.
SUNTRUST EQUITABLE SECURITIES CORPORATION
c/o PaineWebber Incorporated
1285 Avenue of the Americas
New York, New York 10019

Dear Sirs:

     Reference is made to the Underwriting Agreement, dated August 12, 1999 (the
"Underwriting Agreement"), between ONEOK, Inc., an Oklahoma corporation (the
"Company"), and the underwriters named in Schedule I thereto (collectively, the
"Underwriters").  The Underwriting Agreement provides for the purchase by the
Underwriters from the Company, subject to the terms and conditions set forth
therein, of an aggregate of $300,000,000 principal amount of the Company's 7
3/4% Notes due August 15, 2006 (the "Securities") to be issued pursuant to an
Indenture dated as of September 24, 1998 between the Company and Chase Bank of
Texas, National Association, as Trustee.  This Agreement is the Price
Determination Agreement referred to in the Underwriting Agreement.

     Pursuant to Section 1 of the Underwriting Agreement, the undersigned agrees
with the Underwriters that the purchase price for the Securities to be paid by
the Underwriters shall be 98.345% of the aggregate principal amount of the
Securities.

     The Company represents and warrants to the Underwriters that the
representations and warranties of the Company set forth in Section 3 of the
Underwriting Agreement are accurate as though expressly made at and as of the
date hereof.


                                      A-1
<PAGE>

     This Agreement shall be governed by the law of the State of New York
without regard to the conflict of law principles of such State.

     If the foregoing is in accordance with your understanding of the agreement
between the Underwriters and the Company, please sign and return to the Company
a counterpart hereof, whereupon this instrument along with all counterparts and
together with the Underwriting Agreement shall be a binding agreement between
the Underwriters and the Company in accordance with its terms and the terms of
the Underwriting Agreement.

                                  Very truly yours,



                                  ONEOK, INC.


                                  By:___________________________________________
                                  Name:
                                  Title:



Confirmed as of the date
  first above mentioned:

PAINEWEBBER INCORPORATED
BANC OF AMERICA SECURITIES LLC
FIRST UNION CAPITAL MARKETS CORP.
SUNTRUST EQUITABLE SECURITIES CORPORATION

By:  PAINEWEBBER INCORPORATED


By:_______________________________
Name:
Title:


                                      A-2
<PAGE>

                                                                       EXHIBIT B



                               Form of Opinion of
                             Counsel to the Company
                             ----------------------


     1.   The Company and each of its Subsidiaries is a corporation or limited
liability company duly organized, validly existing and in good standing under
the laws of the jurisdiction of its incorporation or organization and has full
corporate power and authority to conduct all the activities conducted by it, to
own or lease all the assets owned or leased by it and to conduct its business as
described in the Registration Statement and the Prospectus.  The Company is the
sole record owner and, to our knowledge, the sole beneficial owner of all of the
capital stock or capital interests of each of its Subsidiaries.

     2.   No consent, approval, authorization or order of, or any filing or
declaration with, any court or governmental agency or body is required in
connection with the authorization, issuance, transfer, sale or delivery of the
Securities, in connection with the execution, delivery and performance of the
Agreement by the Company or in connection with the taking by the Company of any
action contemplated thereby except such as have been obtained under the Act, the
Trust Indenture Act and the Rules and Regulations and such as may be required
under state securities or "Blue Sky" laws or by the by-laws and rules of the
NASD in connection with the purchase and distribution by the Underwriters of the
Securities.

     3.   The Registration Statement and the Prospectus (including any documents
incorporated by reference into the Prospectus, at the time they were filed)
comply or complied in all material respects as to form with the requirements of
the Act, the Rules and Regulations, the Exchange Act, the Exchange Act Rules and
Regulations, the Trust Indenture Act and the Trust Indenture Act Rules and
Regulations and the Indenture complies in all material respects as to form with
the Trust Indenture Act (except that such counsel need not express an opinion as
to (a) financial statements, schedules and other financial data contained in the
Registration Statement or the Prospectus (or incorporated by reference therein)
and (b) the Statement of Eligibility and Qualification under the Trust Indenture
Act of the Trustee on Form T-1).

     4.   To the best of such counsel's knowledge, any instrument, document,
lease, license, contract or other agreement (collectively, "Documents") required
to be described or referred to in the Registration Statement or the Prospectus
has been properly described or referred to therein and any Document required to
be filed as an exhibit to the Registration Statement has been filed as an
exhibit thereto or has been incorporated as an exhibit by reference in the
Registration Statement; and no default exists in the due performance or
observance of any material obligation, agreement, covenant or condition
contained in any Document filed or required to be filed as an exhibit to the
Registration Statement.


                                      B-1
<PAGE>

     5.   To the best of such counsel's knowledge, no person or entity has the
right to require the registration under the Act of shares of common stock or
other securities of the Company by reason of the filing or effectiveness of the
Registration Statement.

     6.   To the best of such counsel's knowledge, the Company is not in
violation of, or in default with respect to, any law, rule, regulation, order,
judgment or decree, except as may be described in the Prospectus or such as in
the aggregate do not now have and will not in the future have a Material Adverse
Effect.

     7.   The Securities and the Indenture conform in all material respects as
to legal matters to the description thereof contained in the Registration
Statement and the Prospectus.  All descriptions in the Prospectus of statutes,
regulations or legal or governmental proceedings are accurate and fairly present
the information required to be shown in all material respects.

     8.   The Company has full corporate power and authority to enter into the
Agreement, and the Agreement has been duly authorized, executed and delivered by
the Company, is a valid and binding agreement of the Company and, except for the
indemnification and contribution provisions thereof, as to which such counsel
need not express an opinion, is enforceable against the Company in accordance
with the terms thereof, subject to bankruptcy, insolvency, reorganization,
fraudulent transfer or conveyance or other laws of general applicability
relating to or affecting creditors' rights and to general principles of equity,
whether such principles are considered in a proceeding at law or equity.

     9.   The Company has full corporate power and authority to enter into the
Indenture and to issue the Securities, and the Indenture has been duly
authorized, executed and delivered by the Company and duly qualified under the
Trust Indenture Act; the Securities have been duly authorized, executed,
authenticated (assuming due authentication by or on behalf of the Trustee),
issued and delivered and are entitled to the benefits of the Indenture; and,
subject to bankruptcy, insolvency, reorganization, fraudulent transfer or
conveyance or other laws of general applicability relating to or affecting
creditors' rights and to general principles of equity, whether such principles
are considered in a proceeding at law or equity, each of the Indenture and the
Securities are legal, valid and binding obligations of the Company and are
enforceable against the Company in accordance with their respective terms.

     10.  The execution and delivery by the Company of, and the performance by
the Company of its agreements in, the Agreement, the Indenture and the
Securities do not and will not (a) violate the certificate of incorporation or
by-laws of the Company, (b) breach or result in a default under, cause the time
for performance of any obligation to be accelerated under, or result in the
creation or imposition of any lien, charge or encumbrance upon any of the assets
of the Company or any of its Subsidiaries pursuant to the terms of, (i) any
indenture, mortgage, deed of trust, loan agreement, bond, debenture, note
agreement, capital lease or other evidence of indebtedness of which such counsel
has knowledge, (ii) any voting trust arrangement or any contract or other
agreement to which the Company is a party that restricts the ability of the
Company to issue securities or (iii) any Document filed as an exhibit to, or
incorporated as an exhibit by reference in, the Registration Statement, (c)
breach or otherwise violate any existing obligation of the Company under any
court or administrative order, judgment or decree of which

                                      B-2
<PAGE>

such counsel has knowledge or (d) violate applicable provisions of any statute
or regulation in the State of Oklahoma or of the United States.

     11.  The Company is not an "investment company" or an "affiliated
person" of, or "promoter" or "principal underwriter" for, an "investment
company," as such terms are defined in the Investment Company Act of 1940, as
amended.

     Such counsel hereby confirms to the Underwriters that such counsel has been
advised by the Commission that the Registration Statement has become effective
under the Act and that no order suspending the effectiveness of the Registration
Statement has been issued and no proceeding for that purpose has been instituted
or is threatened, pending or contemplated.

     Such counsel hereby further confirms to the Underwriters that there are no
actions, suits, proceedings or investigations pending or, to such counsel's
knowledge, overtly threatened in writing against the Company or any of its
Subsidiaries, or any of their respective officers or directors in their
capacities as such, before or by any court, governmental agency or arbitrator
which (i) seek to challenge the legality or enforceability of the Agreement, the
Indenture or the Securities, (ii) seek to challenge the legality or
enforceability of any of the Documents filed, or required to be filed, as
exhibits to the Registration Statement, (iii) seek damages or other remedies
with respect to any of the Documents filed, or required to be filed, as exhibits
to the Registration Statement, (iv) except as set forth in or contemplated by
the Registration Statement and the Prospectus, seek money damages in excess of
$1,000,000 or seek to impose criminal penalties upon the Company, any of its
Subsidiaries or any of their respective officers or directors in their
capacities as such and of which such counsel has knowledge or (v) seek to enjoin
any of the business activities of the Company or any of its Subsidiaries or the
transactions described in the Prospectus and of which such counsel has
knowledge.

     Such counsel has participated in the preparation of the Registration
Statement and the Prospectus and, without assuming any responsibility for the
accuracy, completeness or fairness of the statements contained in the
Registration Statement or the Prospectus or in any amendment or supplement
thereto or in any document incorporated by reference into the Prospectus,
nothing has come to such counsel's attention that causes such counsel to believe
that, both as of the Effective Date and as of the Closing Date, the Registration
Statement, or any amendment thereto, contained or contains any untrue statement
of a material fact or omitted or omits to state a material fact required to be
stated therein or necessary to make the statements therein not misleading or
that any Prospectus or any amendment or supplement thereto including any
documents incorporated by reference into the Prospectus, at the time such
Prospectus was issued, at the time any such amended or supplemented Prospectus
was issued, at the Closing Date, contained or contains any untrue statement of a
material fact or omitted or omits to state a material fact necessary in order to
make the statements therein, in the light of the circumstances in which they
were made, not misleading (except that such counsel need not express an opinion
as to (a) financial statements, schedules and other financial data contained in
the Registration Statement or the Prospectus (or incorporated by reference
therein) and (b) the Statement of Eligibility and Qualification under the Trust
Indenture Act of the Trustee on Form T-1).

                                      B-3
<PAGE>

     In rendering the foregoing opinion, counsel may rely, to the extent they
deem such reliance proper, on the opinions of their counsel as to matters
governed by the laws of jurisdictions other than the United States and the State
of Oklahoma, and as to matters of fact, upon certificates of officers of the
Company and of government officials; provided that such counsel shall state that
in such counsel's opinion that such counsel and the Underwriters are justified
in relying on such opinions of other counsel.  Copies of all such opinions and
certificates shall be furnished to counsel to the Underwriters on the Closing
Date.  For purposes of paragraph 2 and 10(d) above, such counsel has reviewed
only those statutes, rules and regulations, including regulatory rules and
regulations, that in such counsel's experience are applicable to transactions of
the type contemplated by the Agreement or the Indenture or for the offering,
issuance, sale or delivery of the Securities.

     Capitalized terms used in such opinion but not defined shall have the
meanings assigned to them in the Agreement.

<PAGE>

                                                                    Exhibit 1(b)



                                  ONEOK, INC.



                         PRICE DETERMINATION AGREEMENT
                         -----------------------------


                                                                 August 12, 1999



PAINEWEBBER INCORPORATED
BANC OF AMERICA SECURITIES LLC
FIRST UNION CAPITAL MARKETS CORP.
SUNTRUST EQUITABLE SECURITIES CORPORATION
c/o PaineWebber Incorporated
1285 Avenue of the Americas
New York, New York 10019

Dear Sirs:

     Reference is made to the Underwriting Agreement, dated August 12, 1999 (the
"Underwriting Agreement"), between ONEOK, Inc., an Oklahoma corporation (the
"Company"), and the underwriters named in Schedule I thereto (collectively, the
"Underwriters").  The Underwriting Agreement provides for the purchase by the
Underwriters from the Company, subject to the terms and conditions set forth
therein, of an aggregate of $300,000,000 principal amount of the Company's 7
3/4% Notes due August 15, 2006 (the "Securities") to be issued pursuant to an
Indenture dated as of September 24, 1998 between the Company and Chase Bank of
Texas, National Association, as Trustee.  This Agreement is the Price
Determination Agreement referred to in the Underwriting Agreement.

     Pursuant to Section 1 of the Underwriting Agreement, the undersigned agrees
with the Underwriters that the purchase price for the Securities to be paid by
the Underwriters shall be 98.345% of the aggregate principal amount of the
Securities.

     The Company represents and warrants to the Underwriters that the
representations and warranties of the Company set forth in Section 3 of the
Underwriting Agreement are accurate as though expressly made at and as of the
date hereof.
<PAGE>

     This Agreement shall be governed by the Law of the State of New York
Without Regard to the Conflict of law principles of such State.

     If the foregoing is in accordance with your understanding of the agreement
between the Underwriters and the Company, please sign and return to the Company
a counterpart hereof, whereupon this instrument along with all counterparts and
together with the Underwriting Agreement shall be a binding agreement between
the Underwriters and the Company in accordance with its terms and the terms of
the Underwriting Agreement.

                                 Very truly yours,



                                 ONEOK, INC.


                                 By:  /s/ James C. Kneale
                                      --------------------------------------
                                 Name:    James C. Kneale
                                 Title:   Vice President and Chief Financial
                                          Officer



Confirmed as of the date
  first above mentioned:

PAINEWEBBER INCORPORATED
BANC OF AMERICA SECURITIES LLC
FIRST UNION CAPITAL MARKETS CORP.
SUNTRUST EQUITABLE SECURITIES CORPORATION

By:  PAINEWEBBER INCORPORATED


By:  /s/ Peter Masco
    -------------------------------
Name:    Peter Masco
Title:   Managing Director


                                       2

<PAGE>

                                                                       Exhibit 4


================================================================================

                                  ONEOK, INC.

                                 7 3/4% NOTES

                              Due August 15, 2006



                         FIFTH SUPPLEMENTAL INDENTURE

                          Dated as of August 17, 1999



                   Chase Bank of Texas, National Association
                                    TRUSTEE



===============================================================================
<PAGE>

     THIS FIFTH SUPPLEMENTAL INDENTURE is made as of the 17th day of August,
1999, by and between ONEOK, INC., an Oklahoma corporation (the "Company"), and
CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, a national banking association (the
"Trustee").

                              W I T N E S S E T H:

     WHEREAS, the Company has heretofore entered into an Indenture, dated as of
September 24, 1998 (the "Original Indenture"), with the Trustee;

     WHEREAS, the Original Indenture is incorporated herein by this reference
and the Original Indenture, as supplemented by this Fifth Supplemental
Indenture, is herein called the "Indenture";

     WHEREAS, under the Original Indenture, a new series of Securities may at
any time be established pursuant to a supplemental indenture executed by the
Company and the Trustee;

     WHEREAS, the Company proposes to create under the Indenture a new series of
Securities; and

     WHEREAS, all conditions necessary to authorize the execution and delivery
of this Fifth Supplemental Indenture and to make it a valid and binding
obligation of the Company have been done or performed.

     NOW, THEREFORE, in consideration of the agreements and obligations set
forth herein and for other good and valuable consideration, the sufficiency of
which is hereby acknowledged, the parties hereto hereby agree as follows:

                                   ARTICLE 1

                       7 3/4% NOTES DUE AUGUST 15, 2006

     SECTION 101. Establishment. There is hereby established a new series of
Securities to be issued under the Indenture, to be designated as the Company's 7
3/4% Notes Due August 15, 2006 (the "Notes").

     There are to be authenticated and delivered $300,000,000 principal amount
of Notes to be issued at 98.920% of principal amount. The Company shall have the
right to issue additional Notes at any time upon compliance with the provisions
of the Indenture for additional amounts of Securities. The Notes shall be issued
in definitive fully registered form.

     The Notes shall be issued in the form of two Global Securities, each in
substantially the form set out in Exhibit A hereto. The initial Depositary with
respect to the Notes shall be the Depository Trust Company.

     The Company will not pay Additional Amounts, as defined in Section 1008 of
the Original Indenture.
<PAGE>

     The form of the Trustee's Certificate of Authentication for the Notes shall
be in substantially the form set forth in Exhibit B hereto.

     Each Note shall be dated the date of authentication thereof and shall bear
interest from the Original Issue Date.

     The interest rate on the Notes will not be reset pursuant to Section 308(b)
of the Original Indenture and the Stated Maturity shall not be extended pursuant
to Section 309 of the Original Indenture.

     SECTION 102. Definitions. The following defined terms used herein shall,
unless the context otherwise requires, have the meanings specified below.
Capitalized terms used herein for which no definition is provided herein shall
have the meanings set forth in the Original Indenture.

     "Adjusted Treasury Rate" means, with respect to any Redemption Date, the
rate per annum equal to the semiannual equivalent yield to maturity of the
Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue
(expressed as a percentage of its principal amount) equal to the Comparable
Treasury Price for such Redemption Date, plus 0.250%.

     "Comparable Treasury Issue" means the United States Treasury security
selected by a Quotation Agent as having a maturity comparable to the remaining
term of the Notes to be redeemed that would be utilized, at the time of
selection and in accordance with customary financial practice, in pricing new
issues of corporate debt securities of comparable maturity to the remaining term
of such Notes.

     "Comparable Treasury Price" means, with respect to any Redemption Date, (i)
the average of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount) on the third
Business Day preceding such Redemption Date, as set forth in the daily
statistical release (or any successor release) published by the Federal Reserve
Bank of New York and designated "Composite 3:30 p.m. Quotations for U.S.
Government Securities" or (ii) if such release (or any successor release) is not
published or does not contain such prices on such Business Day, (a) the average
of the Reference Treasury Dealer Quotations for such Redemption Date or (b) if
the Company obtains fewer than two such Reference Treasury Dealer Quotations,
such Reference Treasury Dealer Quotations.

     "Interest Payment Dates" means February 15 and August 15 of each year.

     "Original Issue Date" means August 17, 1999.

     "Quotation Agent" means one of the Reference Treasury Dealers appointed by
the Company and certified to the Trustee by the Company.

     "Reference Treasury Dealer" means PaineWebber Incorporated and its
successors; provided, however, that if any of the foregoing shall cease to be a
primary U.S. Government Securities dealer in New York City (a "Primary Treasury
Dealer"), the Company shall substitute therefor another Primary Treasury Dealer
and certify same to the Trustee.

                                       2
<PAGE>

     "Reference Treasury Dealer Quotations" means, with respect to each
Reference Treasury Dealer and any Redemption Date, the average, as determined by
the Company and certified to the Trustee by the Company, of the bid and asked
prices for the Comparable Treasury Issue (expressed in each case as a percentage
of its principal amount) quoted in writing to the Company by such Reference
Treasury Dealer at 5:00 p.m. on the third Business Day preceding such Redemption
Date.

     "Regular Record Date" means February 1 in the case of a February 15
Interest Payment Date and August 1 in the case of an August 15 Interest Payment
Date.

     "Stated Maturity" means August 15, 2006.

     SECTION 103. Payment of Principal and Interest. The principal of the Notes
shall be due at Stated Maturity (unless earlier redeemed). The unpaid principal
amount of the Notes shall bear interest at the rate of 7 3/4% per annum until
paid or duly provided for. Interest shall be paid semi-annually in arrears on
each Interest Payment Date to the Person in whose name the Notes are registered
on the Regular Record Date for such Interest Payment Date and on Stated
Maturity. Accrued interest paid on Stated Maturity shall be paid to the Person
to whom principal is paid. Any such interest that is not so punctually paid or
duly provided for will forthwith cease to be payable to the Holders on such
Regular Record Date and may be paid to the Person or Persons in whose name the
Notes are registered at the close of business on a Special Record Date for the
payment of such defaulted interest to be fixed by the Trustee, notice whereof
shall be given to Holders of the Notes not less than ten days prior to such
Special Record Date.

     Payments of interest on the Notes will include interest accrued to but
excluding the respective Interest Payment Dates. Interest payments for the Notes
shall be computed and paid on the basis of a 360-day year of twelve 30-day
months.

     Payment of the principal and interest due at the Stated Maturity or earlier
redemption of the Notes shall be made upon surrender of the Notes at the office
or agency of the Company in the Borough of Manhattan, City and State of New York
or at the Corporate Trust Office of the Trustee. The principal of and interest
on the Notes shall be paid in such currency of the United States of America as
at the time of payment is legal tender for payment of public and private debts.
Payments of interest will be made at the option of the Company, (i) by check
mailed to the address of the Person entitled thereto as such address shall
appear in the Security Register or (ii) by wire transfer to an account located
in the United States maintained by the payee.

     SECTION 104. Denominations. The Notes may be issued in denominations of
$1,000, or any integral multiple thereof.

     SECTION 105. Global Securities. The Notes will be issued in the form of one
or more Global Securities registered in the name of the Depositary or its
nominee. Except under the limited circumstances described below, Notes
represented by the Global Security will not be exchangeable for, and will not
otherwise be issuable as, Notes in definitive form. The Global Securities
described above may not be transferred except by the Depositary to a nominee of
the

                                       3
<PAGE>

Depositary or by a nominee of the Depositary to the Depositary or another
nominee of the Depositary or to a successor Depositary or its nominee.

     Owners of beneficial interests in such a Global Security will not be
considered the Holders thereof for any purpose under the Indenture, and no
Global Security representing a Note shall be exchangeable, except for another
Global Security of like denomination and tenor to be registered in the name of
the Depositary or its nominee or to a successor Depositary or its nominee. The
rights of Holders of such Global Security shall be exercised only through the
Depositary.

     A Global Security shall be exchangeable for Notes registered in the names
of persons other than the Depositary or its nominee only if (i) the Depositary
notifies the Company that it is unwilling or unable to continue as a Depositary
for such Global Security and no successor Depositary shall have been appointed
by the Company, or if at any time the Depositary ceases to be a clearing agency
registered under the Securities Exchange Act of 1934, as amended, at a time when
the Depositary is required to be so registered to act as such Depositary and no
successor Depositary shall have been appointed by the Company, in each case
within 90 days after the Company receives such notice or becomes aware of such
cessation, (ii) the Company in its sole discretion determines that such Global
Security shall be so exchangeable, or (iii) there shall have occurred an Event
of Default with respect to the Notes.

     SECTION 106. Transfer. No service charge will be made for any transfer or
exchange of Notes, but payment will be required of a sum sufficient to cover any
tax or other governmental charge that may be imposed in connection therewith.

     SECTION 107. Redemption at the Company's Option. The Notes will be
redeemable, in whole or in part, at any time at the option of the Company at a
redemption price (the "Redemption Price") equal to the greater of (i) 100% of
the principal amount of such Notes or (ii) as determined by a Quotation Agent,
the sum of the present values of the remaining scheduled payments of principal
and interest discounted to the date of redemption (the "Redemption Date") on a
semiannual basis (assuming a 360-day year consisting of twelve 30-day months) at
the Adjusted Treasury Rate, plus, in each case, accrued but unpaid interest to
the Redemption Date.

     Notice of any redemption will be mailed at least 30 days but not more than
60 days before the Redemption Date to each Holder of the Notes to be redeemed.
Unless the Company defaults in payment of the Redemption Price, interest will
cease to accrue on the Notes or portions thereof called for redemption on and
after the Redemption Date.

     SECTION 108. The Notes will not have a sinking fund.

     Notice of redemption shall be given as provided in Section 1104 of the
Original Indenture.

     Any redemption of less than all of the Notes shall, with respect to the
principal thereof, be divisible by $1,000.

                                       4
<PAGE>

                                   ARTICLE 2

                           MISCELLANEOUS PROVISIONS

     SECTION 201. Recitals by Company. The recitals in this Fifth Supplemental
Indenture are made by the Company only and not by the Trustee, and all of the
provisions contained in the Original Indenture in respect of the rights,
privileges, immunities, powers and duties of the Trustee shall be applicable in
respect of Notes and of this Fifth Supplemental Indenture as fully and with like
effect as if set forth herein in full.

     SECTION 202. Ratification and Incorporation of Original Indenture. The
Original Indenture is in all respects ratified and confirmed, and the Original
Indenture and this Fifth Supplemental Indenture shall be read, taken and
construed as one and the same instrument; provided that, in the case of a
conflict between this Fifth Supplemental Indenture and the Original Indenture,
this Fifth Supplemental Indenture shall control.

     SECTION 203. Executed in Counterparts. This Fifth Supplemental Indenture
may be simultaneously executed in several counterparts, each of which shall be
deemed to be an original, and such counterparts shall together constitute one
and the same instrument.

     SECTION 204. Parties Interested Herein. Nothing in the Indenture expressed
or implied is intended or shall be construed to confer upon, or to give or grant
to, any person or entity, other than the Company, the Trustee, the Paying Agent
and the registered owners of the Notes, any right, remedy or claim under or by
reason of the Indenture or any covenant, condition or stipulation hereof, and
all covenants, stipulations, promises and agreements in the Indenture contained
by and on behalf of the Company shall be for the sole and exclusive benefit of
the Company, the Trustee, the Paying Agent and the registered owners of the
Notes.

                                       5
<PAGE>

          IN WITNESS WHEREOF, each party hereto has caused this Fifth
Supplemental Indenture to be signed in its name and behalf by its duly
authorized officers or signatories, all as of the day and year first above
written.

ATTEST:                             ONEOK, INC.



By:  /s/                              By:  /s/
    --------------------                  ---------------------------



ATTEST:                               CHASE BANK OF TEXAS, NATIONAL
                                      ASSOCIATION, as Trustee


By:  /s/                              By:  /s/
    -----------------------              --------------------------------
     Authorized Signatory                     Authorized Signatory

                                       6
<PAGE>

                                                                       EXHIBIT A


                                 FORM OF NOTE


                                  [Attached]


                                      A-1
<PAGE>

     THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A
NOMINEE THEREOF. THIS SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A
SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE
REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITORY OR ITS NOMINEE
EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.

     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.


================================================================================
No. __


                                  ONEOK, INC.
                       7 3/4% NOTES DUE AUGUST 15, 2006

                               CUSIP: 682680AE3

     ONEOK, Inc., an Oklahoma corporation (herein called "Company," which term
includes any successor corporation under the Indenture referred to herein), for
value received, hereby promises to pay to:

     CEDE & CO.

or registered assigns, the principal sum of

     *__________________ DOLLARS*

on August 15, 2006 and to pay interest on such principal sum at the rate of
seven and three-fourths percent (7 3/4%) per annum.

     The Company will pay interest from August 17, 1999, semi-annually on
February 15 and August 15 of each year, and on the date of maturity, commencing
February 15, 2000 (each such date an "Interest Payment Date"), until the
principal hereof is otherwise paid or duly provided for. The interest so
payable, and punctually paid or duly provided for, on any Interest Payment Date
will, as provided in the Indenture (as defined below), be paid to the holder of
this Note (the
<PAGE>

"Holder") of record at the close of business on the regular record date (the
"Regular Record Date") for such Interest Payment Date, which, except for
interest payable on August 15, 2006, shall be February 1 (in the case of the
February 15 Interest Payment Date) or August 1 (in the case of the August 15
Interest Payment Date), whether or not a Business Day. Interest will be computed
on the basis of a 360-day year of twelve 30-day months.

     Any such interest not so punctually paid or duly provided for shall
forthwith cease to be payable to the Holder on such Regular Record Date by
virtue of his having been such Holder, and may be paid to the Holder of record
of this Note at the close of business on a special record date (the "Special
Record Date") fixed by the Company for the payment of such defaulted interest,
notice whereof shall be given to Holders not less than 10 days prior to such
Special Record Date, all as more fully provided in the Indenture.

     Payment of the principal of this Note and the interest thereof will be made
at the office or agency of the Company in the Borough of Manhattan, City and
State of New York or at the Corporate Trust Office of the Trustee in such
currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts.
<PAGE>

                                  ONEOK, INC.
                       7 3/4% Notes Due August 15, 2006

     This Note is one of a duly authorized issue of debt securities of the
Company (herein called the "Securities"), issuable in one or more series, issued
and to be issued under and pursuant to an Indenture dated as of September 24,
1998, as amended and supplemented by that certain Fifth Supplemental Indenture
(the "Indenture"), duly executed and delivered by the Company to Chase Bank of
Texas, National Association, as trustee (the "Trustee," which term includes any
successor trustee under the Indenture) and is one of a series unlimited in
aggregate principal amount and designated as 7 3/4% Notes Due August 15, 2006
(the "Notes").  Reference is hereby made to the Indenture for a description of
the rights, limitations of rights, obligations, duties and immunities thereunder
of the Trustee, the Company and the holders of Securities (including Holders of
the Notes).

     The Notes are subject to defeasance at the option of the Company as
provided in the Indenture.

     As long as this Note is represented in global form (the "Global Security")
registered in the name of the Depository or its nominee, except as provided in
the Indenture and subject to certain limitations therein set forth, no Global
Security shall be exchangeable or transferable.

     If an Event of Default (as defined in the Indenture) with respect to the
Notes shall occur and be continuing, the principal plus any accrued interest may
be declared due and payable in the manner and with the effect and subject to the
conditions provided in the Indenture.

     The Indenture permits the amendment thereof and the modification of the
rights and obligations of the Company and the rights of the Holders under the
Indenture at any time by the Company and the Trustee with the consent of the
Holders of a majority in aggregate principal amount of the Securities then
Outstanding (as defined in the Indenture) of all series that are affected by
such amendment or modification, except that certain amendments that do not
adversely affect the rights of any holder of the Securities may be made without
the approval of holders of the Securities.  No amendment or modification may,
among other things, change the Stated Maturity of any Security, reduce the
principal amount thereof, reduce the rate or change the time of payment of any
interest thereon, or reduce the aforesaid majority in aggregate principal amount
of Securities of any series, consent of the holders of which is required for any
such amendment or modification, without the consent of each Securityholder
affected.

     Notwithstanding any provision in the Indenture or any provision of this
Note, the Holder of this Note shall have the right, which is absolute and
unconditional, to receive payment of the principal of (and premium, if any) and
interest on this Note at the times, places and rate, and in the currency herein
prescribed.

     The Notes may be redeemed, in whole or in part, at any time at the option
of the Company at a Redemption Price equal to the greater of (i) 100% of the
principal amount of such Notes or (ii) as determined by a Quotation Agent, the
sum of the present values of the remaining scheduled payments of principal and
interest discounted to the date of redemption on a semiannual basis
<PAGE>

(assuming a 360-day consisting of twelve 30-day months) at the Adjusted Treasury
Rate, plus, in each case, accrued but unpaid interest to the Redemption Date.

     In the event of redemption of the Note in part only, a new Note or Notes of
this series for the unredeemed portion hereof will be issued in the name of the
Holder upon surrender hereof or otherwise reduced in accordance with the
provisions of the Indenture. The Notes will not have a sinking fund.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS
OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAWS.

     All terms used in this Note but not defined herein have the meanings
assigned to them in the Indenture.

     Unless the certificate of authentication hereon has been executed by or on
behalf of the Trustee by manual signature, this Note shall not be entitled to
any benefit under the Indenture or be valid or obligatory for any purpose.
<PAGE>

     IN WITNESS WHEREOF, the Company has caused this Note to be duly executed.

                                        ONEOK, INC.

                                        By:__________________________
                                             Name:
                                             Title:


                                        Attested:______________________
                                                    Name:
                                                    Title:


TRUSTEE'S CERTIFICATE OF AUTHENTICATION

Dated:  ____________________

This is one of the Notes referred to in the within-
mentioned Indenture.

                         CHASE BANK OF TEXAS, NATIONAL ASSOCIATION
                           as Trustee


                         By:_______________________________________
                                   Authorized Signatory
<PAGE>

                 SCHEDULE OF EXCHANGES OF INTEREST IN THE NOTE

     The following exchanges of interests in this Note have been made:

<TABLE>
<CAPTION>
                                                                       Principal Amount of
                     Amount of decrease       Amount of increase        this Note following          Signature of authorized
Date of Exchange         in this Note            in this Note          such decrease or (increase)     signatory of Trustee
<S>                  <C>                      <C>                      <C>                           <C>
</TABLE>
<PAGE>

                                ASSIGNMENT FORM

                 To assign this Note, fill in the form below:
                   I or we assign and transfer this Note to

                      ___________________________________

                      ___________________________________

                  Insert assignee's soc. sec. or tax I.D. no.

                      ___________________________________



_____________________________________________________________________________
             (Print or type assignee's name, address and zip code)

______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
and all rights thereunder and irrevocably appoint ____________________________
______________________________________________________________________________
agent to transfer this Note on the books of the Company.  The agent may
substitute another to act for him.

_______________________________________________________________________________

Dated:________________             ____________________________________________

                                   ____________________________________________

     THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS IT
APPEARS ON THE FIRST PAGE OF THE NOTE.

     THE SIGNATURE MUST BE GUARANTEED BY AN "ELIGIBLE GUARANTOR INSTITUTION"
THAT IS A MEMBER OR PARTICIPANT IN A "SIGNATURE GUARANTEE PROGRAM" (E.G., THE
SECURITIES TRANSFER AGENTS MEDALLION PROGRAM, THE STOCK EXCHANGE MEDALLION
PROGRAM OR THE NEW YORK STOCK EXCHANGE, INC. MEDALLION PROGRAM).
<PAGE>

                                                                       EXHIBIT B


                         CERTIFICATE OF AUTHENTICATION

    This is one of the Notes referred to in the within-mentioned Indenture.

                                        CHASE BANK OF TEXAS, NATIONAL
                                          ASSOCIATION, as Trustee



     Dated:___________________          By:_________________________________
                                                  Authorized Signatory

                                      B-1


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