Document:

EX-4.1

 Exhibit 4.1 

ONEOK PARTNERS, L.P. 

Issuer; 
 ONEOK PARTNERS
INTERMEDIATE LIMITED PARTNERSHIP 
 and 

ONEOK, Inc. 

Guarantors; 
 and

 WELLS FARGO BANK, N.A. 

Trustee 
 FIFTEENTH
SUPPLEMENTAL INDENTURE 
 Dated as of June 30, 2017 

to 
 INDENTURE 

Relating to Senior Debt Securities 

Dated as of September 25, 2006 

2.000% Senior Notes due 2017 

3.200% Senior Notes due 2018 

8.625% Senior Notes due 2019 

3.80% Senior Notes due 2020 

3.375% Senior Notes due 2022 

5.000% Senior Notes due 2023 

4.90% Senior Notes due 2025 

6.65% Senior Notes due 2036 

6.85% Senior Notes due 2037 

6.125% Senior Notes due 2041 

6.200% Senior Notes due 2043 

 FIFTEENTH SUPPLEMENTAL INDENTURE, dated as of June 30, 2017 (this
“Supplemental Indenture”), among ONEOK PARTNERS, L.P., a Delaware limited partnership (the “Partnership”), ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP, a Delaware limited partnership (the “Existing
Guarantor”), ONEOK, Inc., an Oklahoma corporation (the “Parent Guarantor” and, together with the Existing Guarantor, the “Guarantors”), and WELLS FARGO BANK, N.A., as trustee under the Indenture referred to
below (in such capacity, the “Trustee”). 
 RECITALS 

WHEREAS, the Partnership, the Existing Guarantor and the Trustee have heretofore entered into an Indenture, dated as of
September 25, 2006 (the “Original Indenture”) (the Original Indenture, as amended and supplemented from time to time, including without limitation pursuant to this Supplemental Indenture, being referred to herein as the
“Indenture”); 
 WHEREAS, on the date hereof, pursuant to an Agreement and Plan of Merger, dated as of
January 31, 2017 (the “Merger Agreement”), among the Parent Guarantor, New Holdings Subsidiary, LLC, a Delaware limited liability company and wholly owned subsidiary of the Parent Guarantor (“Merger Sub”), the
Partnership and ONEOK Partners GP, L.L.C., a Delaware limited liability company and the general partner of the Partnership, Merger Sub merged with and into the Partnership (the “Merger”), with the Partnership surviving and
continuing to exist as a Delaware limited partnership and, as a result, the Parent Guarantor acquired all of the outstanding common units representing limited partner interests in the Partnership that the Parent Guarantor and its subsidiaries did
not already own; 
 WHEREAS, Section 9.01 of the Original Indenture provides that the Partnership, each Guarantor and the
Trustee may from time to time and at any time, without the consent of Holders, enter into a supplemental indenture to add to the covenants of the Partnership or any Guarantor such further covenants, restrictions, conditions or provisions for the
protection of the Holders of all or any series of Debt Securities as the Board of Directors shall consider to be for the protection of the Holders of such Debt Securities; 

WHEREAS, in connection with the transactions contemplated by the Merger Agreement, the Parent Guarantor desires to become a guarantor
of, and provide a guarantee of, the currently outstanding debt securities, the titles of the series and the current outstanding principal amounts thereof being set forth on Schedule A hereto (collectively, the “Currently Outstanding
Securities”); and 
 WHEREAS, this Supplemental Indenture has not resulted in a material modification of the Currently
Outstanding Securities for Foreign Account Tax Compliance Act purposes, and all things necessary to make this Supplemental Indenture a legal, valid and binding agreement of the Partnership, the Existing Guarantor and the Parent Guarantor have been
done. 
 NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the Parent Guarantor hereby guarantees the Partnership’s obligations under the Currently Outstanding Securities as follows: 

ARTICLE I 
 RELATION TO
INDENTURE; DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION 
 Section 1.01 Relation to Indenture. With respect to
the Currently Outstanding Securities, this Supplemental Indenture constitutes an integral part of the Indenture. 

 Section 1.02 Definitions. For all purposes of this Supplemental Indenture,
capitalized terms used herein and not otherwise defined herein shall have the meanings assigned thereto in the Original Indenture. 

Section 1.03 General References. All references in this Supplemental Indenture to Articles and Sections, unless otherwise
specified, refer to the corresponding Articles and Sections of this Supplemental Indenture; and the term “herein”, “hereof”, “hereunder” and any other word of similar import refers to this Supplemental Indenture. 

ARTICLE II 
 AGREEMENT TO
GUARANTEE 
 Section 2.01 Agreement to Guarantee. 

(a) Except as provided below, the Parent Guarantor hereby agrees to provide a full and unconditional Guarantee (the “Parent
Guarantee”) on the terms and subject to the conditions set forth in Article XII of the Original Indenture. 
 (b) The Parent
Guarantee shall be terminated and discharged and shall be of no further force and effect, and the Parent Guarantor shall be automatically and unconditionally released from all of its obligations under the Parent Guarantee and the Indenture, with
respect to a series of Currently Outstanding Securities, solely upon (i) the legal defeasance, covenant defeasance or satisfaction and discharge of the Indenture with respect to such series of Currently Outstanding Securities as provided in
ARTICLE XI of the Indenture or (ii) such series of Currently Outstanding Securities ceasing to be Outstanding. 
 (c) As used in this
Supplemental Indenture and in Sections 12.01 and 12.02 of the Original Indenture only, the terms “Guarantor,” “Parent Guarantor,” “Guarantee” and “Parent Guarantee” shall include the Parent Guarantor.
Notwithstanding anything in this Supplemental Indenture to the contrary, other than with respect to this Supplemental Indenture and in Sections 12.01 and 12.02 of the Original Indenture, the Parent Guarantor will not be considered a Guarantor,
and the Parent Guarantee will not be considered a Guarantee, for any purpose under the Indenture. Therefore, other than as set forth in this Supplemental Indenture and in Sections 12.01 and 12.02 of the Original Indenture, the Parent Guarantor will
not be subject to the Indenture and will not be subject to any covenants or restrictions contained in the Indenture, including, without limitation, with respect to any merger, consolidation or sale of assets. 

Section 2.02 Benefits Acknowledged. The Parent Guarantor acknowledges that it shall receive direct and indirect benefits from the
financing arrangements contemplated by the Indenture and from the Parent Guarantee under this Supplemental Indenture. 
 Section 2.03
No Requirement to Endorse Notation of Guarantee. The Parent Guarantor hereby agrees that its execution and delivery of this Supplemental Indenture and this ARTICLE II shall evidence its Parent Guarantee without the need for notation on any
Currently Outstanding Securities. 

  
 2 

 Section 2.04 Reports by the Parent Guarantor. If the Partnership is not otherwise
required to file with the SEC information, documents or other reports pursuant to the Exchange Act, then for so long as the Parent Guarantee is in effect with respect to any Currently Outstanding Securities, the Parent Guarantor shall: 

(a) file with the Trustee, within 30 days after the Parent Guarantor is required to file the same with the SEC, copies of the annual reports
and of the information, documents and other reports (or copies of such portions of any of the foregoing as the SEC may from time to time by rules and regulations prescribe) which the Parent Guarantor may be required to file with the SEC pursuant to
Section 13 or Section 15(d) of the Exchange Act; or, if the Parent Guarantor is not required to file information, documents or reports pursuant to either of such Sections, then it shall file with the Trustee and the SEC, in accordance with
rules and regulations prescribed from time to time by the SEC, such of the supplementary and periodic information, documents and reports which may be required pursuant to Section 13 of the Exchange Act in respect of a security listed and
registered on a national securities exchange as may be prescribed from time to time in such rules and regulations; 
 (b) file with the
Trustee and the SEC, in accordance with rules and regulations prescribed from time to time by the SEC, such additional information, documents and reports with respect to compliance by the Parent Guarantor with the conditions and covenants of this
Indenture as may be required from time to time by such rules and regulations; 
 (c) transmit by mail to all Holders of such Currently
Outstanding Securities, as their names and addresses appear in the Debt Security Register, within 30 days after the filing thereof with the Trustee, in the manner and to the extent provided in TIA Section 313(c), such summaries of any
information, documents and reports required to be filed by the Company pursuant to Subsections (a) and (b) of this Section 2.04 as may be required by rules and regulations prescribed from time to time by the SEC; and 

(d) Delivery of such statements, reports, notices and other information and documents to the Trustee pursuant to any of the provisions of this
Section 2.04 is for informational purposes only and the Trustee’s receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Partnership
or any Guarantor’s compliance with any of their covenants under the Indenture (as to which the Trustee is entitled to rely exclusively on Officers’ Certificates). The Trustee shall have no obligation whatsoever to determine whether or not
such information, documents or reports have been filed pursuant to the EDGAR filing system (or its successor) or postings to any website have occurred. 

ARTICLE III 

MISCELLANEOUS 

Section 3.01 Notices. Notices to the Parent Guarantor shall be made in accordance with Section 13.03 of the Indenture at the
address for the Partnership set forth in such Section. 
 Section 3.02 No Recourse Against Others. No director, officer,
employee, partner (including, for greater certainty, any general partner of any general partnership who is an individual person), incorporator, manager, stockholder or member of the Parent Guarantor, as such, will have any liability for any
obligations of the Partnership, the Parent Guarantor or any other Guarantor under the Currently Outstanding Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. The waiver and
release are part of the consideration for the issuance of the Parent Guarantee and the Currently Outstanding Securities. 

Section 3.03 Certain Trustee Matters.  

The recitals contained herein shall be taken as the statements of the Partnership and the Guarantors, and the Trustee makes no representation
as to and assumes no responsibility for their correctness. 

  
 3 

 The Trustee makes no representations as to and shall not be responsible for the validity or
sufficiency of this Supplemental Indenture, the Merger Agreement, the Merger, the Guarantee of the Existing Guarantor and the Parent Guarantor, or the proper authorization or the due execution hereof or thereof by the Partnership or any of the
Guarantors. 
 Except as expressly set forth herein, nothing in this Supplemental Indenture shall alter the duties, rights, privileges,
immunities or obligations of the Trustee set forth in the Original Indenture. In entering into this Supplemental Indenture, the Trustee shall be entitled to the benefit of every provision of the Indenture relating to the conduct or affecting the
liability of or affording protection to the Trustee, whether or not elsewhere herein so provided. 
 Section 3.04 Continued
Effect. Except as expressly supplemented and amended by this Supplemental Indenture, the Original Indenture shall continue in full force and effect in accordance with the provisions thereof, and the Original Indenture (as supplemented and
amended by this Supplemental Indenture) is in all respects hereby ratified and confirmed. This Supplemental Indenture and all its provisions shall be deemed a part of the Original Indenture in the manner and to the extent herein and therein
provided. 
 Section 3.05 Governing Law. This Supplemental Indenture, the Currently Outstanding Securities and the Guarantees
shall be governed by and construed in accordance with the laws of the State of New York. This Supplemental Indenture and the Currently Outstanding Securities are subject to the provisions of the Trust Indenture Act that are required to be part of
this Supplemental Indenture and the Currently Outstanding Securities and shall, to the extent applicable, be governed by such provisions. 

Section 3.06 Counterparts. This instrument may be executed in any number of counterparts, each of which, when delivered, shall be
deemed to be an original, but all such counterparts shall together constitute but one and the same instrument. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF transmission shall constitute effective
execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be
their original signatures for all purposes. 
 Section 3.07 Jury Trial Waiver. EACH OF THE PARTNERSHIP, THE GUARANTORS AND
THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE OR THE TRANSACTIONS CONTEMPLATED
HEREBY. 
 (signature page follows) 

  
 4 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed and delivered, all as of the day and year first above written. 
  

					
	ONEOK PARTNERS, L.P.
		
	By:	 	 ONEOK Partners GP, L.L.C.,
 its
General Partner

		
	By:	 	/s/ Walter S. Hulse III
		 	Name:	 	Walter S. Hulse III
		 	Title:	 	Chief Financial Officer and Executive Vice President, Strategic Planning and Corporate Affairs
	
	ONEOK, INC.
		
	By:	 	/s/ Terry K. Spencer
		 	Name:	 	Terry K. Spencer
		 	Title:	 	President and Chief Executive Officer
	
	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP
		
	 By:
	 	 ONEOK ILP GP, L.L.C.,
 its
General Partner

		
	By:	 	/s/ Walter S. Hulse III
		 	Name:	 	Walter S. Hulse III
		 	Title:	 	Chief Financial Officer and Executive Vice President, Strategic Planning and Corporate Affairs
	
	 WELLS FARGO BANK, N.A.,
 as
Trustee

		
	By:	 	/s/ Gregory S. Clarke
		 	Name:	 	Gregory S. Clarke
		 	Title:	 	Vice President

  
 [Signature Page to
ONEOK Partners Supplemental Indenture] 

 Schedule A 

Currently Outstanding Securities 

$400,000,000 2.000% Senior Notes due 2017 
 $425,000,000 3.200%
Senior Notes due 2018 
 $500,000,000 8.625% Senior Notes due 2019 

$300,000,000 3.80% Senior Notes due 2020 
 $900,000,000 3.375%
Senior Notes due 2022 
 $425,000,000 5.000% Senior Notes due 2023 

$500,000,000 4.90% Senior Notes due 2025 
 $600,000,000 6.65%
Senior Notes due 2036 
 $600,000,000 6.85% Senior Notes due 2037 

$650,000,000 6.125% Senior Notes due 2041 
 $400,000,000 6.200%
Senior Notes due 2043EX-4.2

 Exhibit 4.2 

ONEOK, INC. 
 as Issuer;

 ONEOK PARTNERS, L.P. 

and 
 ONEOK PARTNERS
INTERMEDIATE LIMITED PARTNERSHIP 
 as Guarantors; 

and 
 THE BANK OF NEW
YORK MELLON TRUST COMPANY, N.A. 
 as Trustee 

FIFTH SUPPLEMENTAL INDENTURE 

Dated as of June 30, 2017 

to 
 INDENTURE 

Relating to Debt Securities 

Dated as of September 24, 1998 

6.50% Senior Insured Quarterly Notes due 2028 

6-7/8% Debentures due 2028 

 FIFTH SUPPLEMENTAL INDENTURE, dated as of June 30, 2017 (this “Supplemental
Indenture”), among ONEOK, INC., an Oklahoma corporation (the “Company”), ONEOK PARTNERS, L.P., a Delaware limited partnership (the “Partnership”), ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP, a Delaware
limited partnership (the “Intermediate Partnership” and, together with the Partnership, the “Guarantors”), and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as trustee under the Indenture referred to below (in
such capacity, the “Trustee”). 
 RECITALS 

WHEREAS, the Company and the Trustee have heretofore entered into an Indenture, dated as of September 24, 1998 (the
“Original Indenture”) (the Original Indenture, as amended and supplemented from time to time, including without limitation pursuant to this Supplemental Indenture, being referred to herein as the “Indenture”); 

WHEREAS, on the date hereof, pursuant to an Agreement and Plan of Merger, dated as of January 31, 2017 (the “Merger
Agreement”), among the Company, New Holdings Subsidiary, LLC, a Delaware limited liability company and wholly owned subsidiary of the Company (“Merger Sub”), the Partnership and ONEOK Partners GP, L.L.C., a Delaware limited
liability company and the general partner of the Partnership, Merger Sub merged with and into the Partnership (the “Merger”), with the Partnership surviving and continuing to exist as a Delaware limited partnership and, as a result,
the Company acquired all of the outstanding common units representing limited partner interests in the Partnership that the Company and its subsidiaries did not already own; 

WHEREAS, Section 901 of the Indenture provides that the Company and the Trustee may from time to time and at any time, without the
consent of Holders, enter into a supplemental indenture to make any change that does not adversely affect the rights of any Holder; 

WHEREAS, the changes made herein do not adversely affect the rights of any Holder; 

WHEREAS, all acts and requirements necessary to make this Supplemental Indenture a legal, valid and binding obligation of the Company
and the Guarantors have been done; and 
 WHEREAS, in connection with the transactions contemplated by the Merger Agreement, each of
the Guarantors desires to become a guarantor of, and provide a guarantee of, the currently outstanding securities, the titles of the series and the current outstanding principal amounts thereof being set forth on Schedule A hereto
(collectively, the “Currently Outstanding Securities”). 
 NOW THEREFORE, in consideration of the foregoing and for
other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, each Guarantor hereby guarantees the Company’s obligations under the Currently Outstanding Securities as follows: 

ARTICLE I 
 RELATION TO
INDENTURE; DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION 
 Section 1.01 Relation to Indenture. With respect to
the Currently Outstanding Securities, this Supplemental Indenture constitutes an integral part of the Indenture. 

 Section 1.02 Definitions. For all purposes of this Supplemental Indenture,
capitalized terms used herein and not otherwise defined herein shall have the meanings assigned thereto in the Original Indenture. 

Section 1.03 General References. All references in this Supplemental Indenture to Articles and Sections, unless otherwise
specified, refer to the corresponding Articles and Sections of this Supplemental Indenture; and the term “herein”, “hereof”, “hereunder” and any other word of similar import refers to this Supplemental Indenture. 

ARTICLE II 
 AGREEMENT TO
GUARANTEE 
 Section 2.01 Unconditional Guarantee. 

(a) For value received, subject to Section 2.04 hereof, each of the Guarantors hereby fully, irrevocably, unconditionally and absolutely
guarantees to the Holders of each series of Currently Outstanding Securities and to the Trustee the due and punctual payment of the principal of, and premium, if any, and interest on such Currently Outstanding Securities, and all other amounts due
and payable under the Indenture and such Currently Outstanding Securities by the Company to the Trustee or such Holders (including, without limitation, all costs and expenses (including reasonable legal fees and disbursements) incurred by the
Trustee or such Holders in connection with the enforcement of the Indenture and the Guarantees) (collectively, the “Indenture Obligations”), when and as such amounts shall become due and payable, whether at the Stated Maturity, upon
redemption or by declaration of acceleration or otherwise, according to the terms of such Currently Outstanding Securities and the Indenture. The guarantees by the Guarantors set forth in this ARTICLE II are referred to herein as the
“Guarantees.” Without limiting the generality of the foregoing, each Guarantor’s liability shall extend to all amounts that constitute part of the Indenture Obligations and would be owed by the Company to the Trustee or such
Holders under the Indenture and such Currently Outstanding Securities but for the fact that they are unenforceable, reduced, limited, impaired, suspended or not allowable due to the existence of a bankruptcy, reorganization or similar proceeding
involving the Company. 
 (b) Failing payment when due of any amount guaranteed pursuant to the Guarantees, for whatever reason, each
Guarantor will be obligated (to the fullest extent permitted by applicable law) to pay the same immediately to the Trustee, without set-off or counterclaim or other reduction whatsoever (whether for taxes,
withholding or otherwise). The Guarantees hereunder are intended to be a general, unsecured, senior obligation of each Guarantor and will rank pari passu in right of payment with all unsecured indebtedness of such Guarantor that is not, by
its terms, expressly subordinated in right of payment to the Guarantees of such Guarantor. Each Guarantor hereby agrees that, to the fullest extent permitted by applicable law, subject to Section 2.04 hereof, its obligations hereunder shall be
full, irrevocable, unconditional and absolute, irrespective of the validity, regularity or enforceability of such Currently Outstanding Securities, the Guarantees or the Indenture, the absence of any action to enforce the same, any waiver or consent
by any such Holder with respect to any provisions hereof or thereof, the recovery of any judgment against the Company, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or
defense of such Guarantor. Each Guarantor hereby agrees that in the event of a default in payment of any Indenture Obligations, whether at the Stated Maturity, upon redemption or by declaration of acceleration or otherwise, legal proceedings may be
instituted by the Trustee on behalf of such Holders or, subject to Section 507 of the Indenture, by such Holders, on the terms and conditions set forth in the Indenture, directly against such Guarantor to enforce the Guarantees without first
proceeding against the Company. 

  
 2 

 (c) To the fullest extent permitted by applicable law, subject to Section 2.04 hereof, the
obligations of each Guarantor under this ARTICLE II shall be as aforesaid full, irrevocable, unconditional and absolute and shall not be impaired, modified, discharged, released or limited by any occurrence or condition whatsoever, including,
without limitation, (i) any compromise, settlement, release, waiver, renewal, extension, indulgence or modification of, or any change in, any of the obligations and liabilities of the Company or either Guarantor contained in any of such
Currently Outstanding Securities or the Indenture, (ii) any impairment, modification, release or limitation of the liability of the Company, either Guarantor or any of their estates in bankruptcy, or any remedy for the enforcement thereof,
resulting from the operation of any present or future provision of any applicable Bankruptcy Law, as amended, or other statute or from the decision of any court, (iii) the assertion or exercise by the Trustee or any such Holder of any rights or
remedies under any of such Currently Outstanding Securities or the Indenture or their delay in or failure to assert or exercise any such rights or remedies, (iv) the assignment or the purported assignment of any property as security for any of
such Currently Outstanding Securities, including all or any part of the rights of the Company or either Guarantor under the Indenture, (v) the extension of the time for payment by the Company or either Guarantor of any payments or other sums or
any part thereof owing or payable under any of the terms and provisions of any of such Currently Outstanding Securities or the Indenture or of the time for performance by the Company or either Guarantor of any other obligations under or arising out
of any such terms and provisions or the extension or the renewal of any thereof, (vi) the modification or amendment (whether material or otherwise) of any duty, agreement or obligation of the Company or either Guarantor set forth in the
Indenture, (vii) the voluntary or involuntary liquidation, dissolution, sale or other disposition of all or substantially all of the assets, marshaling of assets and liabilities, receivership, insolvency, bankruptcy, assignment for the benefit
of creditors, reorganization, arrangement, composition or readjustment, rehabilitation or relief of, or other similar proceeding affecting, the Company or either Guarantor or any of their respective assets, or the disaffirmance of any of such
Currently Outstanding Securities, the Guarantees or the Indenture in any such proceeding, (viii) the release or discharge of the Company or either Guarantor from the performance or observance of any agreement, covenant, term or condition
contained in any of such instruments by operation of law, (ix) the unenforceability of any of such Currently Outstanding Securities, the Guarantees or the Indenture, (x) any change in the name, business, capital structure, corporate
existence, or ownership of the Company or either Guarantor, or (xi) any other circumstance which might otherwise constitute a defense available to, or a legal or equitable discharge of, a surety or either Guarantor. 

(d) To the fullest extent permitted by applicable law, each Guarantor hereby (i) waives diligence, presentment, demand of payment, notice
of acceptance, filing of claims with a court in the event of the merger, insolvency or bankruptcy of the Company or such Guarantor, and all demands and notices whatsoever, (ii) acknowledges that any agreement, instrument or document evidencing
the Guarantees may be transferred and that the benefit of its obligations hereunder shall extend to each holder of any agreement, instrument or document evidencing the Guarantees without notice to them and (iii) covenants that its Guarantees
will not be discharged except by complete performance of the Guarantees. To the fullest extent permitted by applicable law, each Guarantor further agrees that if at any time all or any part of any payment theretofore applied by any Person to any
Guarantees is, or must be, rescinded or returned for any reason whatsoever, including without limitation, the insolvency, bankruptcy or reorganization of either Guarantor, such Guarantees shall, to the extent that such payment is or must be
rescinded or returned, be deemed to have continued in existence notwithstanding such application, and the Guarantees shall continue to be effective or be reinstated, as the case may be, as though such application had not been made. 

(e) Each Guarantor shall be subrogated to all rights of the Holders and the Trustee against the Company in respect of any amounts paid by such
Guarantor pursuant to the provisions of the Indenture; provided, however, that such Guarantor shall not be entitled to enforce or to receive any payments arising out of, or based upon, such right of subrogation with respect to any of
such Currently Outstanding Securities until all of such Currently Outstanding Securities and the Guarantees shall have been indefeasibly paid in full or discharged. 

  
 3 

 (f) To the fullest extent permitted by applicable law, no failure to exercise and no delay in
exercising, on the part of the Trustee or the Holders, any right, power, privilege or remedy under this ARTICLE II and the Guarantees shall operate as a waiver thereof, nor shall any single or partial exercise of any rights, power, privilege or
remedy preclude any other or further exercise thereof, or the exercise of any other rights, powers, privileges or remedies. The rights and remedies herein provided for are cumulative and not exclusive of any rights or remedies provided in law or
equity. Nothing contained in this ARTICLE II shall limit the right of the Trustee or the Holders to take any action to accelerate the maturity of such Currently Outstanding Securities pursuant to Article FIVE of the Indenture or to pursue any
rights or remedies under the Indenture or under applicable law. 
 Section 2.02 Limitation on Guarantor Liability. Each
Guarantor and the Trustee hereby confirms that it is the intention of all such parties that the Guarantees of such Guarantor not constitute a fraudulent transfer or conveyance for purposes of Bankruptcy Law, the Uniform Fraudulent Conveyance Act,
the Uniform Fraudulent Transfer Act or any similar federal or state law to the extent applicable to any Guarantees. To effectuate the foregoing intention, the Trustee and the Guarantors hereby irrevocably agree that the obligations of such Guarantor
will be limited to the maximum amount that will, after giving effect to such maximum amount and all other contingent and fixed liabilities of such Guarantor that are relevant under such laws, and after giving effect to any collections from, rights
to receive contribution from or payments made by or on behalf of the other Guarantor in respect of the obligations of such other Guarantor under this ARTICLE II, result in the obligations of such Guarantor under its Guarantees not constituting a
fraudulent transfer or conveyance. 
 Section 2.03 No Requirement to Endorse Notation of Guarantee. Each Guarantor hereby agrees
that its execution and delivery of this Supplemental Indenture and this ARTICLE II shall evidence its Guarantee without the need for notation on any Currently Outstanding Securities. 

Section 2.04 Release of Guarantee.  

(a) Notwithstanding anything to the contrary in this ARTICLE II, if a Guarantor (i) shall cease to be a Subsidiary of the Company or
(ii) shall no longer be (x) an obligor on, or issuer of, any capital markets debt securities or (y) a guarantor of any capital markets debt securities issued by the Company or the other Guarantor, in each case other than the Currently
Outstanding Securities or any other series of capital market debt securities of the Company outstanding on, and for which such Guarantor is giving a guarantee, the date hereof, then if no Default or Event of Default shall have occurred and be
continuing, such Guarantor, upon giving notice to the Trustee to the foregoing effect, shall be deemed to be released from all of its obligations under the Indenture, and the Guarantees shall be of no further force or effect with respect to such
Guarantor. Following the receipt by the Trustee of any such notice, the Company shall cause the Indenture to be amended as provided in Section 901 of the Indenture; provided, however, that the failure to so amend the Indenture
shall not affect the validity of the termination of the Guarantees with respect to such Guarantor. 
 (b) In addition, upon (i) the
exercise of the legal defeasance or covenant defeasance option or the satisfaction and discharge of the Indenture as provided in ARTICLES FOURTEEN and FOUR, respectively, of the Indenture with respect to a series of Currently Outstanding Securities,
or (ii) a series of Currently Outstanding Securities ceasing to be Outstanding, each of the Guarantors shall be deemed to be released from all its obligations under the Indenture with respect to such series of Currently Outstanding Securities
and the Guarantees of such series of Currently Outstanding Securities shall be of no further force or effect. 

  
 4 

 Section 2.05 Benefits Acknowledged. Each Guarantor acknowledges that it shall receive
direct and indirect benefits from the financing arrangements contemplated by the Indenture and from the Guarantees under this Supplemental Indenture. 

ARTICLE III 

MISCELLANEOUS 

Section 3.01 Notices. Notices to the Guarantor shall be made in accordance with Section 105 of the Indenture at the address
for the Company set forth in such Section. 
 Section 3.02 No Recourse Against Others. No director, officer, employee, partner
(including, for greater certainty, any general partner of any general partnership who is an individual person), incorporator, manager, stockholder or member of either Guarantor, as such, will have any liability for any obligations of the Company,
such Guarantor or the other Guarantor under the Currently Outstanding Securities or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. The waiver and release are part of the consideration for
the issuance of the Guarantees and the Currently Outstanding Securities. 
 Section 3.03 Certain Trustee Matters. 

The recitals contained herein shall be taken as the statements of the Company and the Guarantors, and the Trustee assumes no responsibility
for their correctness. 
 The Trustee makes no representations as to the validity or sufficiency of this Supplemental Indenture or the
proper authorization or the due execution hereof or thereof by the Company or any of the Guarantors. 
 Except as expressly set forth
herein, nothing in this Supplemental Indenture shall alter the duties, rights, privileges, immunities or obligations of the Trustee set forth in the Original Indenture. 

The Trustee shall not be liable for any action taken, suffered, or omitted to be taken by it in good faith and reasonably believed by it to be
authorized or within the discretion or rights or powers conferred upon it by this Indenture. 
 In no event shall the Trustee be responsible
or liable for special, indirect, or consequential loss or damage of any kind whatsoever (including, but not limited to, loss of profit) irrespective of whether the Trustee has been advised of the likelihood of such loss or damage and regardless of
the form of action. 
 The Trustee shall not be deemed to have notice of any Default or Event of Default unless the Trustee has actual
knowledge thereof or unless written notice of any event which is in fact such a default is received by the Trustee at the Corporate Trust Office of the Trustee, and such notice references the Securities and this Indenture. 

The rights, privileges, protections, immunities and benefits given to the Trustee, including, without limitation, its right to be indemnified,
are extended to, and shall be enforceable by, the Trustee in each of its capacities hereunder, and each agent, custodian and other Person employed to act hereunder. 

  
 5 

 EACH OF THE COMPANY, THE HOLDERS AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST
EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS INDENTURE, THE CURRENTLY OUTSTANDING SECURITIES OR THE TRANSACTION CONTEMPLATED HEREBY. 

In no event shall the Trustee be responsible or liable for any failure or delay in the performance of its obligations hereunder arising out of
or caused by, directly or indirectly, forces beyond its control, including, without limitation, strikes, work stoppages, accidents, acts of war or terrorism, civil or military disturbances, nuclear or natural catastrophes or acts of God, and
interruptions, loss or malfunctions of utilities, communications or computer (software and hardware) services; it being understood that the Trustee shall use reasonable efforts which are consistent with accepted practices in the banking industry to
resume performance as soon as practicable under the circumstances. 
 Section 3.04 Continued Effect. Except as expressly
supplemented and amended by this Supplemental Indenture, the Original Indenture shall continue in full force and effect in accordance with the provisions thereof, and the Original Indenture (as supplemented and amended by this Supplemental
Indenture) is in all respects hereby ratified and confirmed. This Supplemental Indenture and all its provisions shall be deemed a part of the Original Indenture in the manner and to the extent herein and therein provided. 

Section 3.05 Governing Law. This Supplemental Indenture and the Currently Outstanding Securities shall be governed by and
construed in accordance with the laws of the State of New York. This Supplemental Indenture and the Currently Outstanding Securities are subject to the provisions of the Trust Indenture Act that are required to be part of this Supplemental Indenture
and the Currently Outstanding Securities and shall, to the extent applicable, be governed by such provisions. 
 Section 3.06
Counterparts. This instrument may be executed in any number of counterparts, each of which, when delivered, shall be deemed to be an original, but all such counterparts shall together constitute but one and the same instrument. 

(signature page follows) 

  
 6 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed and delivered, all as of the day and year first above written. 
  

					
	ONEOK, INC.
		
	By:	 	/s/ Terry K. Spencer
		 	Name:	 	Terry K. Spencer
		 	Title:	 	President and Chief Executive Officer
	
	ONEOK PARTNERS, L.P.
		
	By:	 	 ONEOK Partners GP, L.L.C.,
 its
General Partner

		
	By:	 	/s/ Walter S. Hulse III
		 	Name:	 	Walter S. Hulse III
		 	Title:	 	Chief Financial Officer and Executive Vice President, Strategic Planning and Corporate Affairs
	
	ONEOK PARTNERS INTERMEDIATE LIMITED PARTNERSHIP
		
	By:	 	 ONEOK ILP GP, L.L.C.,
 its
General Partner

		
	By:	 	/s/ Walter S. Hulse III
		 	Name:	 	Walter S. Hulse III
		 	Title:	 	Chief Financial Officer and Executive Vice President, Strategic Planning and Corporate Affairs
	
	 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,

as Trustee

		
	By:	 	/s/ Valerie Boyd
		 	Name:	 	Valerie Boyd
		 	Title:	 	Vice President

  
 [Signature Page to
ONEOK Supplemental Indenture] 

 Schedule A 

Currently Outstanding Securities 

$87,126,000 6.50% Senior Insured Quarterly Notes due 2028 

$100,000,000 6-7/8% Debentures due 2028

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