EX-4.2




 Exhibit 4.2 

ONE GAS, INC. 

SUPPLEMENTAL INDENTURE NO. 6 

$300,000,000 4.25% Senior Notes due 2032 

THIS SUPPLEMENTAL INDENTURE NO. 6, dated as of August 8, 2022 (this “Supplemental Indenture”), between ONE GAS, INC., an Oklahoma
corporation (the “Company”) and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (successor in interest to U.S. Bank National Association), a national banking association, as trustee (the “Trustee”). 

RECITALS OF THE COMPANY: 
 WHEREAS, the
Company has heretofore executed and delivered to the Trustee an Indenture, dated as January 27, 2014 (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”), providing for the issuance from time to time of one or more series of Securities (as defined in the Indenture); 

WHEREAS, Article Nine of the Original Indenture provides for various matters with respect to any series of Securities issued under the Indenture to be
established in an indenture supplemental to the Original Indenture; 
 WHEREAS, Section 9.1(7) of the Original Indenture provides that the Company and
the Trustee may enter into an indenture supplemental to the Original Indenture to establish the form or terms of Securities of any series as permitted by Sections 2.1 and 3.1 of the Original Indenture; and 

WHEREAS, all the conditions and requirements necessary to make this Supplemental Indenture, when duly executed and delivered, a valid and binding agreement in
accordance with its terms and for the purposes herein expressed, have been performed and fulfilled. 
 NOW THEREFORE, THIS SUPPLEMENTAL
INDENTURE WITNESSETH 
 For and in consideration of the premises and the issuance of the series of Securities provided for herein, the Company and the
Trustee mutually covenant and agree for the equal and proportionate benefit of the respective Holders of the Securities of each such series as follows: 

ARTICLE I 
 RELATION TO
INDENTURE; DEFINITIONS; RULES OF CONSTRUCTION 
 SECTION 1.1 Relation to Indenture. This Supplemental Indenture constitutes an integral part
of the Indenture. 
 SECTION 1.2 Definitions. For all purposes of this Supplemental Indenture, the following terms shall have the respective
meanings set forth in this Section. 
 “Definitive Note” means a certificated Note that does not include the legend prescribed in
Section 2.4 of the Original Indenture. 
 “Depository” means The Depository Trust Company, its nominees and their respective
successors. 
 “Global Notes” means one or more Securities evidencing all or part of the Securities to be issued as Book-Entry
Securities, issued to the Depositary in accordance with Section 3.1 of the Original Indenture and bearing the legend prescribed in Section 2.4 of the Original Indenture. 

“Notes” shall have the meaning set forth in Section 2.1 hereof. 











 “Notes Custodian” means the custodian with respect to a Global Note (as appointed by
the Depository) or any successor person thereto, who will initially be the Trustee. 
 “Participant” means members of, or
participants in, the Depository. 
 SECTION 1.3 Rules of Construction. For all purposes of this Supplemental Indenture: 

(a) capitalized terms used herein without definition shall have the meanings specified in the Indenture; 

(b) all references herein to Articles and Sections, unless otherwise specified, refer to the corresponding Articles and Sections of this
Supplemental Indenture; 
 (c) terms “herein,” “hereof,” “hereunder” and other words of similar import refer
to this Supplemental Indenture; and 
 (d) in the event of a conflict with the definition of terms in the Indenture, the definitions in this
Supplemental Indenture shall control. 
 ARTICLE II 

THE SECURITIES 
 SECTION 2.1 Title
of the Notes. There shall be a series of Securities designated the 4.25% Senior Notes due 2032. 
 SECTION 2.2 Initial Principal Amount. The
Notes will be initially issued in an aggregate principal amount of $300,000,000. 
 SECTION 2.3 Form and Dating. 

(a) General. The Notes and the Trustee’s certificate of authentication shall be substantially in the form of Exhibit A
hereto. The Notes may have notations, legends or endorsements required by law, stock exchange rule or usage. Each Note shall be dated the date of its authentication. The Notes shall be in denominations of $2,000 and integral multiples of $1,000 in
excess thereof. 
 The terms and provisions contained in the Notes shall constitute, and are hereby expressly made, a part of this Supplemental Indenture,
and the Company and the Trustee, by their execution and delivery of this Supplemental Indenture, expressly agree to such terms and provisions and to be bound thereby. However, to the extent any provision of any Note conflicts with the express
provisions of this Supplemental Indenture, the provisions of this Supplemental Indenture shall govern and be controlling. 
 The Company hereby designates
The Depository Trust Company as the initial depository for the Global Notes. 
 (b) Global Notes. The Notes shall initially be
issuable in whole or in part in the form of one or more Global Notes. Such Global Notes (i) shall be deposited with, or on behalf of, the Depository, which shall act as depository with respect to the Notes, (ii) shall bear the legend
prescribed by Section 2.4 of the Original Indenture, (iii) may be exchanged in whole or in part upon the terms and subject to the conditions provided in Section 3.5 of the Original Indenture and (iv) shall otherwise be subject to
the applicable provisions of the Indenture. 
 (c) Book-Entry Provisions. This Section 2.3(c) shall apply only to a Global Note
deposited with or on behalf of the Depository. The Company shall execute and the Trustee shall, in accordance with this Section 2.3(c) and pursuant to a Company Order, authenticate and deliver initially one or more Global Notes that
(a) shall be registered in the name of the Depository for such Global Note or Global Notes or the nominee of such Depository and (b) shall be delivered by the Trustee to such Depository or pursuant to such Depository’s instructions or
held by the Trustee as Notes Custodian. 

  
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 Participants shall have no rights under the Indenture with respect to any Global Note held on their behalf
by the Depository or by the Trustee as Notes Custodian or under such Global Note, and the Depository may be treated by the Company, the Trustee and any agent of the Company or the Trustee as the absolute owner of such Global Note for all purposes
whatsoever. Notwithstanding the foregoing, nothing herein shall prevent the Company, the Trustee or any agent of the Company or the Trustee from giving effect to any written certification, proxy or other authorization furnished by the Depository or
impair, as between the Depository and its Participants, the operation of customary practices of such Depository governing the exercise of the rights of a holder of a beneficial interest in any Global Note. 

(d) Definitive Notes. Except as provided in Section 2.4 hereof, owners of beneficial interests in Global Notes will not be
entitled to receive physical delivery of certificated Notes. 
 (e) Cancellation of Global Note. At such time as all beneficial
interests in a Global Note have either been exchanged for Definitive Notes, transferred, redeemed, repurchased or canceled, such Global Note shall be returned by the Depository to the Trustee for cancellation or retained and canceled by the Trustee.
At any time prior to such cancellation, if any beneficial interest in a Global Note is exchanged for Definitive Notes, transferred in exchange for an interest in another Global Note, redeemed, repurchased or canceled, the principal amount of Notes
represented by such Global Note shall be reduced and an adjustment shall be made on the books and records of the Trustee (if it is then the Notes Custodian for such Global Note) with respect to such Global Note, by the Trustee or the Notes
Custodian, to reflect such reduction. 
 SECTION 2.4 Definitive Notes. 

(a) A Global Note deposited with the Depository or with the Trustee as Notes Custodian pursuant to Section 2.3 shall be transferred to
the beneficial owners thereof in the form of Definitive Notes in an aggregate principal amount equal to the principal amount of such Global Note, in exchange for such Global Note in the event (i) the Depository (A) notifies the Company
that the Depository is no longer willing or able to act as a depositary or clearing system for the Notes or (B) ceases to be a “clearing agency” registered under the Securities Exchange Act of 1934, as amended, and, in either event, a
successor depositary or clearing system is not appointed by the Company within 90 days of such notice or cessation, (ii) the Company, in its sole discretion, notifies the Trustee in writing that it elects to cause the issuance of Definitive
Notes under the Indenture, or (iii) upon the occurrence and continuation of an Event of Default and the Depository notifies the Trustee of its decision to exchange the Global Note for Definitive Notes. 

(b) Any Global Note that is transferable to the beneficial owners thereof pursuant to this Section 2.4 shall be surrendered by the
Depository to the Trustee, to be so transferred, in whole or from time to time in part, without charge, and upon Company Order the Trustee shall authenticate and deliver, upon such transfer of each portion of such Global Note, an equal aggregate
principal amount of Definitive Notes of authorized denominations. Any portion of a Global Note transferred pursuant to this Section 2.4 shall be executed, authenticated and delivered only in denominations of $2,000 of principal amount and any
integral multiple of $1,000 in excess thereof and registered in such names as the Depository shall direct. 
 (c) The registered Holder of a
Global Note may grant proxies and otherwise authorize any Person, including Participants and Persons that may hold interests through Participants, to take any action which a Holder is entitled to take under the Indenture or the Notes as provided
therein. 
 (d) In the event of the occurrence of any of the events specified in Section 2.4(a)(i), (ii) or (iii), the Company will
promptly make available to the Trustee a reasonable supply of Definitive Notes in fully registered form without interest coupons. 
 SECTION 2.5
Stated Maturity. The Stated Maturity of the Notes shall be September 1, 2032. 
 SECTION 2.6 Interest and Interest Rate. The rate at
which the Notes shall bear interest, the date or dates from which such interest shall accrue, the interest payment dates on which any such interest shall be payable and the regular record date for any interest payable on any interest payment date,
in each case, shall be as set forth in the form of Note set forth as Exhibit A hereto. 

  
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 SECTION 2.7 Optional Redemption. At its option, the Company may redeem the Notes, in whole or in
part, at any time and from time to time, at the applicable redemption price determined as set forth in the form of Note attached hereto as Exhibit A, in accordance with the terms set forth therein and in accordance with Article XI of the Original
Indenture. 
 ARTICLE III 

MISCELLANEOUS PROVISIONS 
 SECTION 3.1
Ratification. The Indenture, as supplemented and amended by this Supplemental Indenture, is in all respects hereby adopted, ratified and confirmed. 

SECTION 3.2 Counterparts. This Supplemental Indenture may be executed in any number of counterparts, each of which when so executed shall be
deemed an original, and all such counterparts shall together constitute but one and the same instrument. 
 SECTION 3.3 Governing Law. THIS
SUPPLEMENTAL INDENTURE AND EACH SECURITY SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 
 SECTION 3.4
Conflict with Trust Indenture Act. If any provision hereof limits, qualifies or conflicts with a provision of the Trust Indenture Act that is required under such Act to be a part of and govern this Supplemental Indenture, the latter provision
shall control. If any provision of this Supplemental Indenture modifies or excludes any provision of the Trust Indenture Act that may be so modified or excluded, the latter provision shall be deemed to apply to this Supplemental Indenture as so
modified or to be excluded, as the case may be. 
 [Signature Page Follows] 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture No. 6 to
be duly executed as of the day and year first above written. 
  

			
	ONE GAS, INC.
		
	By:	 	 /s/ Caron Lawhorn

		 	Caron Lawhorn
		 	 Senior Vice President and Chief Financial

Officer



 [SIGNATURE PAGE TO SUPPLEMENTAL
INDENTURE NO. 6] 











 
			
	U.S. BANK TRUST COMPANY,
	NATIONAL ASSOCIATION
		 	as Trustee
		
	By:	 	 /s/ David W. Ferrell

		 	David W. Ferrell
		 	Vice President


 [SIGNATURE PAGE TO SUPPLEMENTAL
INDENTURE NO. 6] 











 Exhibit A 

[FORM FACE OF NOTE] 
 THIS SECURITY IS
A BOOK-ENTRY SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE OF A DEPOSITORY. THIS SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN
THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER
NOMINEE OF THE DEPOSITORY. 
 ONE GAS, INC. 

4.25% Senior Notes due 2032 
  

			
	No. R-1	  	$300,000,000
		  	CUSIP: 68235P AM0

 ONE Gas, Inc., a corporation duly organized and existing under the laws of Oklahoma (herein called the “Company,”
which term includes any successor Person under the Indenture hereinafter referred to), for value received, hereby promises to pay to , or registered assigns, the principal sum of THREE HUNDRED MILLION DOLLARS, and to pay interest thereon from
August 8, 2022 or from the most recent Interest Payment Date (as defined below) to which interest has been paid or duly provided for, semi-annually on March 1 and September 1 (each such date, an “Interest Payment Date”) and
in each year, commencing March 1, 2023, at the rate of 4.25% per annum, until the principal hereof is paid or made available for payment, and (to the extent that the payment of such interest shall be legally enforceable) at the same rate on any
overdue principal and premium and on any overdue installment of interest. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this
Security (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date (as defined below) for such interest, which shall be (a) the February 15 or August 15 (whether or not a Business Day),
as the case may be, immediately preceding such Interest Payment Date or (b) so long as this note is a global note in book-entry form on the Business Day immediately preceding such Interest Payment Date. Any such interest not so punctually paid
or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date (each a “Regular Record Date”) and may either be paid to the Person in whose name this Security (or one or more Predecessor
Securities) is 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 Securities of this series not less than 10 days prior to
such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such
exchange, all as more fully provided in said Indenture. 
 Reference is hereby made to the further provisions of this Security set forth on the reverse
hereof, which further provisions shall for all purposes have the same effect as if set forth at this place. 
 Unless the certificate of authentication
hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose. 











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

Dated: 
  

			
	ONE GAS, INC.
		
	By:	 	  

		 	Caron A. Lawhorn
		 	Senior Vice President and Chief Financial
		 	Officer


 I, Brian K. Shore, Vice President, Associate General Counsel and Secretary of ONE Gas, Inc., do hereby certify that
Caron A. Lawhorn is the duly qualified and elected Senior Vice President and Chief Financial Officer of ONE Gas, Inc. and that the signature set forth above her name is her true signature. 

Dated: 

			
		
	By:	 	  

		 	Brian K. Shore
		 	Vice President, Associate General Counsel and
		 	Secretary


 [Signature Page to 2032 Global Note] 











 TRUSTEE’S CERTIFICATE OF AUTHENTICATION 

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture. 

Dated: 
  

			
	U.S. BANK TRUST COMPANY,
	NATIONAL ASSOCIATION
	as Trustee
		
	By:	 	  

		 	David W. Ferrell
		 	Vice President

 [Signature Page to 2032 Global Note] 











 [REVERSE OF NOTE] 

ONE GAS, INC. 
 4.25% Senior Notes
Due 2032 
 This Security is one of a duly authorized issue of securities of the Company (herein called the “Securities”), issued
and to be issued in one or more series under an Indenture, dated as of January 27, 2014, as it may be supplemented or amended from time to time, including without limitation Supplemental Indenture No. 6 (herein called the
“Indenture”), between the Company and U.S. Bank Trust Company, National Association (successor in interest to U.S. Bank National Association), as Trustee (herein called the “Trustee”, which term
includes any successor trustee under the Indenture), to which Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the
Company, the Trustee and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered. This Security is one of the series designated on the face hereof, limited in aggregate principal
amount to $300,000,000. 
 Prior to June 1, 2032 (which is the date that is three months prior to the maturity date of the Securities) (the
“Par Call Date”), the Company may redeem the Securities at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded to three decimal
places) equal to the greater of: 
 (1)(a) the sum of the present values of the remaining scheduled payments of principal and interest
thereon discounted to the redemption date (assuming the Securities matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve
30-day months) at the Treasury Rate (as defined below) plus 25 basis points less (b) interest accrued and unpaid thereon to the date of redemption, and 

(2) 100% of the principal amount of the Securities to be redeemed, 

plus, in either case, accrued and unpaid interest thereon to, but excluding, the redemption date. 

On or after the Par Call Date, the Company may redeem the Securities at its option, in whole or in part, at any time and from time to time, at a redemption
price equal to 100% of the principal amount of the Securities being redeemed plus accrued and unpaid interest thereon to, but excluding, the redemption date. 

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Company in accordance with the following two paragraphs.

 The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are
posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent
statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily)—H.15” (or any successor designation or publication) (“H.15”) under the
caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: 

(1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the
“Remaining Life”); or 
 (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining
Life, the two yields—one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life—and shall
interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or 











 (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the
Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal
to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date. 
 If on the third business day
preceding the redemption date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business
day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there
are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select
the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of
the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United
States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon
the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places. 

The Company’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

 The redemption price will be quoted to the Trustee in writing and the Trustee shall have no duty to determine, or verify the calculation of, the
redemption price. 
 The Indenture contains provisions for defeasance at any time of the entire indebtedness of this Security or certain restrictive
covenants and Events of Default with respect to this Security, in each case upon compliance with certain conditions set forth therein. 
 The Indenture
permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any
time by the Company and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the
Holders of specified percentages in principal amount of the Securities at the time Outstanding of any series, on behalf of the Holders of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and
certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon
the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security. 

No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and interest on this Security at the times, place and rate, and in the coin or currency, herein prescribed. 

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registerable in the Security Register,
upon surrender of this Security for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Security are payable, duly endorsed by, or accompanied by a written
instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series and of like tenor, of
authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. 











 The Securities of this series are issuable only in registered form without coupons in denominations of
$2,000 and whole multiples of $1,000 in excess thereof. As provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series
and of like tenor of a different authorized denomination, as requested by the Holder surrendering the same. 
 No service charge shall be made for any such
registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith. 

Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this Security is registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary. 

All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture. 

This Security shall be governed by and construed in accordance with the laws of the State of New York.