Document:

EX-10.8

 Exhibit 10.8 
 ONE GAS, INC. 
 NONQUALIFIED 

DEFERRED COMPENSATION PLAN 
 Effective January 1, 2014 

  
 1 

 ONE GAS, INC. 
 NONQUALIFIED DEFERRED COMPENSATION PLAN 
 Effective January 1, 2014

 Table of Contents 
  

							
	 	 	 	  	Page	 
		
	 Article I. INTRODUCTION
	  	 	1	  
	 1.1
	 	 Establishment
	  	 	1	  
	 1.2
	 	 Purpose
	  	 	1	  
	 1.3
	 	 Effective Date
	  	 	2	  
	 1.4
	 	 Grandfathered Plan
	  	 	2	  
		
	 Article II. DEFINITIONS
	  	 	2	  
	 2.1
	 	 Definitions
	  	 	2	  
		
	 Article III. ELIGIBILITY AND PARTICIPATION
	  	 	14	  
	 3.1
	 	 Eligibility
	  	 	14	  
	 3.2
	 	 Participation
	  	 	14	  
	 3.3
	 	 Elections to Participate Irrevocable
	  	 	15	  
	 3.4
	 	 Exclusion from Eligibility
	  	 	15	  
		
	 Article IV. DEFERRAL OF COMPENSATION AND EXCESS AMOUNTS
	  	 	15	  
	 4.1
	 	 Amount and Time of Election to Defer
	  	 	15	  
	 4.2
	 	 Deferral Periods; Payment
	  	 	17	  
	 4.3
	 	 Committee Authority; Deferral of Compensation
	  	 	18	  
	 4.4
	 	 General Requirements for All Elections
	  	 	18	  
	 4.5
	 	 Subsequent Elections
	  	 	19	  
	 4.6
	 	 Crediting Deferred Base Salary and Bonus
	  	 	20	  
	 4.7
	 	 Crediting of Plan Excess Amounts
	  	 	20	  
	 4.8
	 	 FICA and Other Taxes
	  	 	20	  
		
	 Article V. PLAN EXCESS AMOUNTS
	  	 	20	  
	 5.1
	 	 General
	  	 	20	  
	 5.2
	 	 Thrift Plan Excess Employee Amount
	  	 	21	  
	 5.3
	 	 Thrift Plan Excess Matching Amount
	  	 	21	  
	 5.4
	 	 Profit Sharing Plan Excess Amount
	  	 	22	  
	 5.5
	 	 Retirement Plan Covered Compensation Excess Amount
	  	 	22	  
	 5.6
	 	 Supplemental Credit Amount
	  	 	22	  
	 5.7
	 	 Required Elections to Defer Excess Amounts
	  	 	23	  
		
	 Article VI. BENEFIT ACCOUNTS
	  	 	23	  
	 6.1
	 	 Determination of Account
	  	 	23	  
	 6.2
	 	 Crediting of Investment Return; Other Items to Participant Accounts
	  	 	23	  
	 6.3
	 	 Investment Return; Designated Deemed Investment
	  	 	23	  
	 6.4
	 	 Statement of Account
	  	 	24	  
	 6.5
	 	 Vesting of Participant Accounts
	  	 	24	  

  
 i 

							
	 Article VII. PAYMENT OF BENEFITS
	  	 	24	  
	 7.1
	 	 Requirements for Distributions and Payments
	  	 	24	  
	 7.2
	 	 Payment of Plan Benefit; Long-Term Deferrals
	  	 	25	  
	 7.3
	 	 Payment of Plan Benefit; Short-Term Deferrals
	  	 	25	  
	 7.4
	 	 Specified Employee Six (6) Month Required Delay in Distribution and Payment
	  	 	26	  
	 7.5
	 	 Form of Distribution and Payment
	  	 	26	  
	 7.6
	 	 Distribution and Payment for Subsequent Elections
	  	 	27	  
	 7.7
	 	 Distribution and Payment for Early Separation from Service
	  	 	27	  
	 7.8
	 	 Distribution and Payment of Plan Benefit Upon Disability
	  	 	27	  
	 7.9
	 	 Distribution and Payment of Plan Benefit Upon Death
	  	 	28	  
	 7.10
	 	 Payment of Deferrals for Unforeseeable Emergency
	  	 	28	  
	 7.11
	 	 Commencement of Distributions and Payments
	  	 	29	  
	 7.12
	 	 No Acceleration of Distribution and Payment
	  	 	30	  
	 7.13
	 	 Retirement Plan Excess Amount
	  	 	30	  
		
	 Article VIII. BENEFICIARY DESIGNATION
	  	 	31	  
	 8.1
	 	 Beneficiary Designation
	  	 	31	  
	 8.2
	 	 Amendments
	  	 	31	  
	 8.3
	 	 No Designation
	  	 	31	  
	 8.4
	 	 Effect of Payment
	  	 	31	  
		
	 Article IX. ADMINISTRATION
	  	 	31	  
	 9.1
	 	 Plan Committee; Authority and Duties
	  	 	31	  
	 9.2
	 	 Delegation; Agents
	  	 	33	  
	 9.3
	 	 Binding Effect of Decisions
	  	 	33	  
	 9.4
	 	 Indemnity of Committee
	  	 	33	  
		
	 Article X. AMENDMENT AND TERMINATION OF PLAN
	  	 	34	  
	 10.1
	 	 Amendment
	  	 	34	  
	 10.2
	 	 Termination
	  	 	34	  
		
	 Article XI. PLAN EFFECT, LIMITATIONS, MISCELLANEOUS PROVISIONS
	  	 	35	  
	 11.1
	 	 Nature of Employer Obligation; Funding
	  	 	35	  
	 11.2
	 	 Trusts; Transfers of Assets, Property
	  	 	35	  
	 11.3
	 	 Nonassignability
	  	 	36	  
	 11.4
	 	 Captions
	  	 	37	  
	 11.5
	 	 Code Section 409A
	  	 	37	  
	 11.6
	 	 Governing Law
	  	 	37	  
	 11.7
	 	 Successors
	  	 	37	  
	 11.8
	 	 No Right to Continued Service
	  	 	37	  
	 EXHIBIT A
	  	 	38	  
	 EXHIBIT B
	  	 	40	  
	 EXHIBIT C
	  	 	41	  
	 EXHIBIT D
	  	 	42	  
	 EXHIBIT E
	  	 	44	  

  
 ii 

 ONE GAS, INC. 
 NONQUALIFIED DEFERRED COMPENSATION PLAN 
 Effective January 1, 2014 

ARTICLE I. 

INTRODUCTION 
  

	1.1	Establishment 

 On
November 13, 2013, in anticipation of the Separation that is proposed to occur in 2014, the Board of Directors of ONEOK approved the (1) the establishment, effective January 1, 2014, of a deferred compensation plan that is
substantially similar to the ONEOK 2005 NQDC Plan for the benefit of ONE Gas Employees and Former ONE Gas Employees; (2) the exclusion of ONE Gas Employees and Former ONE Gas Employees from participating in the ONEOK 2005 NQDC Plan for periods
after December 31, 2013; and (3) the transfer of liabilities for ONE Gas Employees and Former ONE Gas Employees who are participants in the ONEOK 2005 NQDC Plan to this Plan effective January 1, 2014. 

By unanimous consent, the Board of Directors of ONE Gas approved the adoption of this Plan, effective January 1, 2014, for the benefit of ONE Gas
Employees and Former ONE Gas Employees. Effective January 1, 2014, all liabilities attributable to ONE Gas Employees and Former ONE Gas Employees under the ONEOK 2005 NQDC Plan are transferred and accepted by this Plan. For periods after
December 31, 2013, (1) ONE Gas Employees and Former One Gas Employees shall not be eligible to participate in the ONEOK 2005 NQDC Plan; (2) the ONEOK 2005 NQDC Plan and any successors thereto shall have no further obligation or
liability to any ONE Gas Employee or Former ONE Gas Employee with respect to any benefit, amount or right accrued under the ONEOK 2005 NQDC Plan; and (3) this Plan is liable for the payment of any benefits accrued by ONE Gas Employees and
Former ONE Gas Employees under the ONEOK 2005 NQDC Plan. No individual is entitled to a benefit under both this Plan and the ONEOK 2005 NQDC Plan. 
 The terms and conditions of this Plan are substantially the same as the terms and conditions of the ONEOK 2005 NQDC Plan. Exhibit A to the Plan sets forth additional rules applicable to Transferred
Participants. 
  

	1.2	Purpose 

 This Plan and related
agreements between the Employer and certain management or highly compensated employees is an unfunded, nonqualified deferred compensation plan and arrangement. 
 The purpose of the Plan is to provide a select group of management and highly compensated employees of the Employer with the option to defer the receipt of portions of their compensation payable for
services rendered to the Employer, and provide nonqualified deferred compensation benefits which are not available to such employees by reason of limitations on employer and employee contributions to qualified pension or profit-sharing plans under
the federal tax laws. 

  
 1 

 It is intended that the Plan will assist in attracting and retaining qualified individuals to serve as
officers and managers of the Employer; and the Plan is intended to constitute a plan which is unfunded and maintained by an employer primarily for the purpose of providing deferred compensation for a select group of management or highly compensated
employees within the meaning of, and as described in Section 201(2) and related provisions of ERISA. 
 The Plan is intended to meet all
requirements of Code section 409A for compensation deferred under the Plan to not be includible in gross income of the Participant until actually paid or distributed pursuant to the Plan. Nothing herein shall be construed as a guarantee of any
particular tax treatment to a Participant. 
 All provisions of the Plan shall be interpreted and administered to the extent possible in a
manner consistent with the stated intentions. 
  

	1.3	Effective Date 

 The Plan is
effective on January 1, 2014. 
  

	1.4	Grandfathered Plan 

 This Plan is
separate from the ONE Gas Pre-2005 NQDC Plan, which ONE Gas established to receive liabilities transferred from the ONEOK Pre-2005 DCP in connection with the Separation. 
 ARTICLE II. 
 DEFINITIONS 

 

	2.1	Definitions 

 When used in this
Plan and initially capitalized, the following words and phrases shall have the meanings indicated: 
 Account 

“Account” means an account established and maintained for a Participant pursuant to this Plan, to which there shall be credited with and include
all amounts of Deferred Compensation that is deferred by and for the Participant under the Plan, which may be accounted for as one or more separate items, amounts or subaccounts for the compensation that is deferred and credited pursuant to the
Plan, and investment return thereon, to as determined and prescribed by the Committee. 

  
 2 

 Base Salary 
 “Base Salary” means a Participant’s basic wage or salary paid by the Employer to the Participant without regard to any increases or decreases in such basic wage or salary as a result of
(i) an Election to defer basic wage or salary under this Plan or (ii) an Election between benefits or cash provided under a plan of the Employer maintained pursuant to Sections 125 or 401(k) of the Code, and as limited in Exhibit C
attached hereto. The Base Salary does not include any Lump Sum Merit Award paid to a Participant, nor any Bonus, as defined below. 

Beneficiary 

“Beneficiary” means the person or persons designated or deemed to be designated by the Participant pursuant to Article VIII to receive benefits
payable under the Plan in the event of the Participant’s death. 
 Board 

“Board” means the Board of Directors of the Corporation. 
 Bonus 
 “Bonus” means the cash bonus paid or payable by the Employer to a
Participant under an Incentive Plan without regard to any decreases as a result of (i) an Election to defer all or any portion of such Bonus under this Plan or (ii) an Election between benefits or cash provided under the Thrift Plan or any
other plan of the Employer maintained pursuant to Section 401(k) of the Code. 
 Change in Ownership or Control 

“Change in Ownership or Control” means (i) prior to the effective date of the Separation, a change in the ownership or effective control of
ONEOK or in the ownership of a substantial portion of ONEOK’s assets within the meaning of Code Section 409A; and (ii) on or after the effective date of the Separation, a change in the ownership or effective control of ONE Gas or in
the ownership of a substantial portion of ONE Gas’s assets within the meaning of Code Section 409A. For avoidance of doubt, the Separation will not constitute a Change in Ownership or Control for purposes of the Plan. 

Code 
 “Code” means the
Internal Revenue Code of 1986, and Treasury regulations thereunder, as amended from time to time. 
 Committee 

“Committee” means the Executive Compensation Committee of the Board of Directors of the Corporation. 

Compensation 

“Compensation” means the Base Salary and Bonus payable with respect to an Eligible Employee for each calendar year. 

  
 3 

 Corporation 
 “Corporation” means ONE Gas, Inc., its successors and assigns, or any division or Subsidiary thereof. 
 Deferred Compensation 
 “Deferred Compensation” means the Base Salary and
Bonus deferred by a Participant under the Plan, and Qualified Employer Plan Excess Amounts and Supplemental Credit Amounts that are accrued, deferred and credited by the Corporation for a Participant under the Plan, that are made payable to a
Participant in a later taxable year of the Participant pursuant to this Plan. 
 Determination Date 

“Determination Date” means a date on which the amount of a Participant’s Account is determined and updated as provided in Article VI.
Each December 31 of a calendar year shall be the Determination Date. 
 Disabled 

“Disabled” or “Disability” means that a Participant is unable to engage in substantial gainful activity by reason of any medically
determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than twelve (12) months, or is, by reason of any medically determinable physical or mental
impairment which can be expected to result in death or expected to last for a continuous period of not less than twelve (12) months, receiving income replacement benefits for a period of not less than three (3) months under an accident or
health plan covering Employees of the Corporation. A Participant will be deemed to be Disabled if such Participant is determined to be totally disabled by the Social Security Administration. 
 Early Separation from Service 
 “Early Separation from Service” means a
Participant’s Separation from Service prior to attaining age fifty (50) and completing five (5) years of service with the Corporation that is not by reason of death or Disability. 

Early Separation from Service Form of Payment 
 “Early Separation from Service Form of Payment” shall mean the form of payment and distribution of a Participant’s Plan Benefit in the event of his/her Early Separation from Service which
shall be a single lump sum payment at his/her Early Separation from Service Specified Time of Distribution. 

  
 4 

 Early Separation from Service Specified Time of Distribution 

“Early Separation from Service Specified Time of Distribution” means a time of distribution and payment of the Participant’s Plan Benefit
which is the date of his/her Early Separation from Service. 
 Election 
 “Election” means, as the context requires, (i) the Participant’s election to defer Base Salary, Bonus, and/or Qualified Employer Plan Excess Amounts earned with respect to services
performed during a Plan Year, (ii) the Corporation’s election to credit the Participant’s Account with Supplemental Credit Amounts and/or a Retirement Plan Excess Amount, and/or (iii) the Participant’s distribution
elections. 
 Eligible Employee 
 “Eligible Employee” means a highly compensated or management employee of the Corporation and any member of the ONE Gas Group who is designated by the Committee, by individual name, or group or
description, in accordance with Section 3.1, as eligible to participate in the Plan. For avoidance of doubt, no employees of any member of the ONEOK Group are eligible to participate in the Plan. 

Employee 
 “Employee”
means an employee of the Corporation or a Subsidiary. 
 Employer 
 “Employer” means, with respect to a Participant, the Corporation or the Subsidiary which pays such Participant’s Compensation. 
 ERISA 
 “ERISA” means the Employee Retirement Income Security Act of 1974,
as amended. 
 Exchange Act 
 “Exchange Act” means the Securities Exchange Act of 1934, as amended. 
 Fiscal
Year 
 “Fiscal Year” means the fiscal year of the Corporation commencing January 1 and ending the following
December 31. 

  
 5 

 Fixed Schedule 
 “Fixed Schedule” means the distribution or payment of Deferred Compensation deferred under the Plan in a fixed schedule of distributions or payments that are determined and fixed at the time the
deferral of such compensation is first elected by the Participant or Corporation under the Plan. 
 Former ONE Gas Employee

 “Former ONE Gas Employee” means any individual (or any beneficiary, dependent, or alternate payee of such individual, as the
context requires) whose employment with any member of the ONEOK Group was terminated prior to January 1, 2014, if such individual was allocated in connection with the Separation to any member of the ONE Gas Group as of January 1, 2014 by
ONEOK in its sole discretion. 
 Incentive Plan 
 “Incentive Plan” means the Annual Officer Incentive Plan or Annual Employee Incentive Plan of the Corporation, as applicable to a Participant under the terms and provisions thereof. 

Investment Return 

“Investment Return” means the rate of investment return to be credited to a Participant’s Account pursuant to Section 6.2, which rate
shall be determined in accordance with Section 6.3 and Exhibit “D” attached hereto; provided, that no Investment Return shall be credited with respect to the Retirement Plan Excess Amount. 

Long-Term Deferral 

“Long-Term Deferral” means a deferral Election that is not a Short-Term Deferral and under which distribution and payment of the Deferred
Compensation and the Plan Benefit shall be distributed and paid at a Specified Time that shall be the Normal Specified Time of Distribution of the Participant. If a Subsequent Election is made, the Plan Benefit deferred by a Long-Term Deferral in
the Election shall then be distributed and paid at the Subsequent Election Specified Time of Distribution elected in the Subsequent Election. 

Lump Sum Merit Award 
 “Lump
Sum Merit Award” means a Lump Sum Merit Award granted and paid to a Participant pursuant to the merit compensation program of the Corporation and its Subsidiaries. 

  
 6 

 Normal Specified Time of Distribution 
 “Normal Specified Time of Distribution” means a specified time that must be expressly designated as the Specified Time of Distribution of the compensation deferred by a Participant in and for
each Long-Term Deferral Election, which Normal Specified Time of Distribution shall be the first date on which the Participant has (i) attained the age of fifty (50) years, (ii) completed five (5) years of service with the
Corporation, and (iii) had a Separation from Service. 
 ONE Gas 
 “ONE Gas” shall mean ONE Gas, Inc., an Oklahoma corporation, or any division or subsidiary thereof. 
 ONE Gas Employee 
 “ONE Gas Employee” means an active employee or an
employee on vacation or on approved leave of absence (including sick leave, qualified military service under the Uniformed Services Employment and Reemployment Rights Act of 1994, as amended, and leave under the Family Medical Leave Act, as
amended), in either case, of any member of the ONE Gas Group on or after January 1, 2014, and shall include any beneficiary, dependent, or alternate payee of such employee, as the context requires. 

ONE Gas Group 
 “ONE Gas
Group” means ONE Gas and each subsidiary of ONE Gas as of January 1, 2014 and any ONE Gas subsidiary that is established or acquired after January 1, 2014. 
 ONE Gas Pre-2005 NQDC Plan 
 “One Gas Pre-2005 NQDC Plan” shall mean the
separate ONE Gas, Inc. Pre-2005 Nonqualified Deferred Compensation Plan, which ONE Gas established to receive liabilities transferred from the ONEOK Pre-2005 NQDC Plan in connection with the Separation. 

ONEOK 
 “ONEOK” means
ONEOK, Inc., an Oklahoma corporation. 
 ONEOK 2005 NQDC Plan 
 “ONEOK 2005 NQDC Plan” shall mean the ONEOK, Inc. 2005 Nonqualified Deferred Compensation Plan. 
 ONEOK Group 
 “ONEOK Group” means (i) prior to January 1, 2014,
ONEOK and any of its direct or indirect subsidiaries, and (ii) on and after January 1, 2014, ONEOK and its subsidiaries as of January 1, 2014 (other than any member of the ONE Gas Group) and any ONEOK subsidiary (other than any member
of the ONE Gas Group) that is established or acquired after January 1, 2014. 

  
 7 

 ONEOK Pre-2005 NQDC Plan 
 “ONEOK Pre-2005 NQDC Plan” shall mean the ONEOK, Inc. Employee Nonqualified Deferred Compensation Plan, which was frozen to new deferrals effective December 31, 2004. 

Participant 

“Participant” means a Transferred Participant or any Eligible Employee who elects to participate by filing a Participation Agreement as provided
in Section 3.2. 
 Participation Agreement 
 “Participation Agreement” means the agreement filed by a Participant, in the form prescribed by the Committee, pursuant to Section 3.2. 

Person 
 “Person” means
an individual, a trust, estate, partnership, limited liability company, association, corporation or other entity. 
 Performance-Based
Compensation 
 “Performance-Based Compensation” means compensation, including Bonus (as hereinabove defined), that is
conditioned upon or subject to meeting certain requirements similar to those under Code Section 162(m), as more particularly provided for in Treasury Regulations issued under Code Section 409A. 

Plan 
 “Plan” means this
ONE Gas, Inc. Nonqualified Deferred Compensation Plan, as amended from time to time. 
 Plan Benefit 

“Plan Benefit” means the deferred benefit payable to a Participant or a Participant’s Beneficiary pursuant to Article VII and otherwise
under the Plan. 
 Plan Year 
 “Plan Year” means a twelve-month period commencing January 1 and ending the following December 31. 

  
 8 

 Profit Sharing Plan 
 “Profit Sharing Plan” means the ONE Gas, Inc. Profit Sharing Plan. 
 Profit
Sharing Plan Excess Amount 
 “Profit Sharing Plan Excess Amount” means an amount equal to the Participant’s Compensation
for the Plan Year that is used for calculating Company Contributions to the Profit Sharing Plan multiplied by the applicable percentage for determining the Company Contributions under the Profit Sharing Plan for the Plan Year, minus the amount of
Profit Sharing Plan Company Contributions that are allocated to the Participant’s Account for that Plan Year; it being intended that a Participant shall have credited with a Profit Sharing Plan Excess Amount that is equivalent to the amount of
Company Contributions which could not be allocated to the Participant’s Profit Sharing Plan Account for the Plan Year by reason of all limitations on compensation and Company Contributions applicable to Profit Sharing Plan Company Contributions
under the Code and Treasury regulations under the Code, including (i) the limitation on annual compensation of an Employee that may be taken into account under Code section 401(a)(17), (ii) the limitation on contributions and other
additions under Code section 415(c), and (iii) the exclusion of the amount that a Participant has elected to defer out of his or her Base Salary or Bonus under this Plan from “compensation” as defined in the Profit Sharing Plan and/or
used for calculation of Profit Sharing Plan contributions and allocations, which amount is to be credited to a Participant’s Account under Section 5.4 of the Plan. 
 Qualified Employer Plan Excess Amounts 
 “Qualified Employer Plan Excess
Amounts” means amounts deferred by or for a Participant with respect to participation and/or benefits provided under a qualified defined contribution plan or defined benefit plan established and maintained by the Employer, as more particularly
provided for under Article V and otherwise in this Plan. 
 Retirement Plan 

“Retirement Plan” means the ONE Gas, Inc. Retirement Plan. 
 Retirement Plan Covered Compensation Excess Amount 
 “Retirement Plan Covered
Compensation Excess Amount” means an amount for a Participant who is a participant in the Retirement Plan, and not a participant in the ONE Gas, Inc. Supplemental Executive Retirement Plan nor a participant in the Profit Sharing Plan, that is
equal to the Participant’s Compensation for the Plan Year less the limitations on compensation and contributions by the Corporation under the Code and Treasury regulations under the Code, including the limitation on annual compensation of an
Employee that may be taken into account under Code section 401(a)(17), multiplied by the applicable percentage for determining the Company Contributions under the Profit Sharing Plan for the Plan Year, which amount is to be credited to be allocated
to, or recorded in and accounted for in the Account of a Participant under Section 5.5 of the Plan. 

  
 9 

 Retirement Plan Excess Amount 
 “Retirement Plan Excess Amount” means the additional amount payable to a Participant who is a participant in the Retirement Plan pursuant to Section 7.13. 

Separation 

“Separation” means the separation of ONEOK’s local natural gas distribution business into an independent, publicly traded entity to be
known as ONE Gas. 
 Separation from Service 
 “Separation from Service” means (i) prior to the effective date of the Separation, the termination of a Participant’s employment within the meaning of Treasury Regulations section
1.409A-1(h) with all members of the ONEOK Group and all members of the ONE Gas Group other than by reason of the Participant’s Disability or death; and (ii) on or after the effective date of the Separation, the termination of a
Participant’s employment within the meaning of Treasury Regulations section 1.409A-1(h) with the Corporation and all members of the ONE Gas Group other than by reason of the Participant’s Disability or death. 

Shares 
 “Shares” means
the common stock, par value $0.01 per share, of the Corporation and any other securities into which such shares are changed or for which such shares are exchanged. 
 Short-Term Deferral 
 “Short-Term Deferral” means a deferral elected by a
Participant under which payment of the Plan Benefit shall be deferred to commence at a Specified Time of Distribution irrespective of the Participant’s Separation from Service that is specified by the Participant in his or her Election, that
shall be not less than five (5) years after the Participant’s Election thereof; provided, that the Committee, may, in its sole discretion, determine and direct that a shorter period, of not less than two (2) years, be applied to any
Short-Term Deferral. If a Subsequent Election is made, the Plan Benefit deferred by a Short-Term Deferral in the Election shall then be distributed and paid at the Subsequent Election Specified Time of Distribution elected in the Subsequent
Election. 
 Specified Employee 
 “Specified Employee” means an Employee who, as of the date of the Employee’s Separation from Service, is a key employee of a Corporation if any stock of the Corporation is then publicly
traded on an established securities market or otherwise; and for purposes of this definition, an Employee is a key employee if the Employee meets the requirements of Code Section 416(i)(1)(A)(i), (ii), or (iii) (applied in accordance with
the regulations thereunder and disregarding section 416(i)(5)) at any time during the 12-month period ending on a Specified 

  
 10 

 
Employee Identification Date. If an Employee is a key employee as of a Specified Employee Identification Date, the Employee shall be treated as a key employee for purposes of the Plan for the
entire 12-month period beginning on the Specified Employee Effective Date. For purposes of identifying a Specified Employee by applying the requirements of section 416(i)(1)(A)(i), (ii), and (iii), the definition of compensation under
§1.415(c)-2(a) shall be used, applied as if the Corporation were not using any safe harbor provided in §1.415(c)-2(d), were not using any of the elective special timing rules provided in §1.415(c)-2(e), and were not using any of the
elective special rules provided in §1.415(c)-2(g). 
 Specified Employee Effective Date 

“Specified Employee Effective Date” is the first day of the fourth month following the Specified Employee Identification Date. 

Specified Employee Identification Date 
 “Specified Employee Identification Date” means December 31. 
 Specified Time

 “Specified Time” means a date or dates that are not discretionary and objectively determinable at the time an amount of
Compensation is deferred and at which objectively determinable deferred amounts are to be payable. 
 Specified Time of Distribution

 “Specified Time of Distribution” means a Specified Time at which Compensation deferred by a Participant’s Election
pursuant to the Plan is required to be distributed or paid and which is specified in writing by the Participant in and at the time the deferral of such Compensation is elected by the Election of a Participant. 

Subsequent Election 

“Subsequent Election” means an irrevocable election made by a Participant with respect to the time of distribution or payment of Deferred
Compensation and Plan Benefit under the Plan that is made at any time after Election that is made by the Participant and/or Corporation with respect to such Deferred Compensation. 
 Subsequent Election Specified Date 
 “Subsequent Election Specified Date”
shall mean a specified fixed date in a calendar year that must be specified in writing by the Participant in a Subsequent Election that is not less than five (5) years from the date payment would otherwise have been made to the Participant
under the Plan if such Subsequent Election was not made by the Participant. The written specification of the Subsequent Election Specified Date shall in all cases specify and fix a Specified Time that is not less than five (5) years from the
date payment would otherwise have been made to the 

  
 11 

 
Participant, it being contemplated and intended that such written specification shall, without limitation, in the case of a Long-Term Deferral (i) meet the requirement in the case of a
Participant who has not attained the age of fifty (50) years that the specified Subsequent Election Specified Date be on or after the date the Participant would attain the age of fifty-five (55) years, and (ii) meet the requirement in
the case of a Participant who has attained the age of fifty (50) years, that the specified Subsequent Election Specified Date be not less than five (5) years from the date next following the date of the Subsequent Election; and in the case
of a Short-Term Deferral meet the requirement that the Subsequent Election Specified Date is not less than five (5) years after the date payment would otherwise have been made to the Participant. 

Subsequent Election Specified Time of Distribution 
 “Subsequent Election Specified Time of Distribution” means: 
  

	 	(a)	in the case of a Long-Term Deferral, a Specified Time of Distribution that shall be the first date on or after the Subsequent Election Specified Date for the Long-Term
Deferral on which the Participant has (i) attained the age of fifty (50) years, (ii) completed five (5) years of service with the Corporation, and (iii) had a Separation from Service, and 

 

	 	(b)	in the case of a Short-Term Deferral, a Specified Time of Distribution that shall be the Subsequent Election Specified Date for the Short-Term Deferral.

 Subsidiary 
 “Subsidiary” means any corporation of which the Corporation owns, directly or indirectly, at least a majority of the shares of stock having voting power in the election of directors of such
corporation. 
 Supplemental Credit Amount 
 “Supplemental Credit Amount” means a supplemental amount that may be deferred at the election and direction of the Committee under Section 4.3(b). 

Taxable Year 
 “Taxable
Year” shall mean the Plan Year commencing January 1 and ending the following December 31. 
 Thrift Plan

 “Thrift Plan” means the ONE Gas, Inc. 401(k) Plan. 
 Thrift Plan Excess Employee Amount 
 “Thrift Plan Excess Employee Amount”
means an amount equal to the amounts that would have been allocated to the Participant’s Account under the Thrift Plan for the Plan Year by reason of 

  
 12 

 
the Participant’s elections under the Thrift Plan, minus the amount that was allocated to the Participant’s account under the Thrift Plan for that Plan Year it being intended that a
Participant shall have credited to the Participant’s Account the amount of contributions which could not be allocated to the Participant’s Thrift Plan account for the Plan Year by reason of and after application of the limitations on
compensation and contributions or annual additions and otherwise applicable to the Thrift Plan under the Code and Treasury regulations, including (i) Code section 401(a)(17), (ii) Code section 415(c), (iii) the exclusion of the amount
the Participant elected to defer out of his or her Compensation under this Plan from “compensation” as defined and/or used for calculation of Thrift Plan contributions or allocations, and other limitations on Thrift Plan employee elective
contributions under the Code. 
 Thrift Plan Excess Matching Amount 
 “Thrift Plan Excess Matching Amount” means an amount equal to the Participant’s Thrift Plan Matching Contribution Percentage under the Thrift Plan for the Plan Year multiplied by the
Participant’s compensation as defined in the Thrift Plan and/or used for calculation of Thrift Plan contributions and allocations in that Plan Year, minus the amount of Thrift Plan matching contributions made by the Corporation that are
allocated to the Participant’s Thrift Plan account for that Plan Year; it being intended that a Participant shall have credited to the Participant’s Account the amount of matching contributions which could not be allocated to the
Participant’s Thrift Plan account for the Plan Year by reason of and after application of the limitations on compensation and contributions or annual additions and otherwise applicable to the Thrift Plan under the Code and Treasury regulations,
including (i) Code section 401(a)(17), (ii) Code section 415(c), (iii) the exclusion of the amount the Participant elected to defer out of his or her Compensation under this Plan from “compensation” as defined and/or used
for calculation of Thrift Plan contributions or allocations, and other limitations on Thrift Plan matching contributions under the Code. 

Thrift Plan Matching Contribution Percentage 
 “Thrift Plan Matching Contribution Percentage” means the matching contribution percentage in effect for a specific Plan Year under the Thrift Plan. 

Transferred Participant 

“Transferred Participant” means a ONE Gas Employee or Former ONE Gas Employee who was a participant in the ONEOK 2005 NQDC Plan immediately
before January 1, 2014. 
 Trust 
 “Trust” means a trust created and established pursuant to Section 11.2 of the Plan, or otherwise by the Corporation with respect to the Plan. 

  
 13 

 Unforeseeable Emergency 
 “Unforeseeable Emergency” means a severe financial hardship to the Participant resulting from illness or accident of the Participant, the Participant’s spouse, or a dependent (as defined in
Code Section 152) of the Participant, loss of the Participant’s property due to casualty, or other similar extraordinary circumstances arising as a result of events beyond the control of the Participant, including such events and
circumstances as are described and considered to be an unforeseeable emergency under Code section 409A and the Treasury regulations thereunder. It is intended and directed with respect to any such unforeseeable emergency that any amounts distributed
under the Plan by reason thereof shall not exceed the amounts necessary to satisfy such emergency plus amounts necessary to pay taxes reasonably anticipated as a result of the distribution, after taking into account the extent to which such hardship
is or may be relieved through reimbursement or compensation by insurance or otherwise or by liquidation of the Participant’s assets (to the extent the liquidation of such assets would not itself cause severe financial hardship). 

ARTICLE III. 
 ELIGIBILITY AND PARTICIPATION 
  

	3.1	Eligibility 

 Eligibility to
participate in the Plan shall be granted to Transferred Participants and those Eligible Employees who are designated by the Committee. Subject to Section 3.4, below (providing for exclusion of Employees not qualifying under certain definitional
terms of federal law), the Committee shall adopt a complete written list and/or designation of the Eligible Employees, by individual name or by reference to an identifiable group of persons or by descriptions of the components of compensation of an
individual which would qualify the individuals who are eligible to participate, and all of whom shall be a select group of management or highly compensated employees. The written list and/or designation of Eligible Employees by the Committee, from
time to time, shall be adopted and maintained in the records of the Committee and Corporation. 
  

	3.2	Participation 

 Participation in
the Plan shall be limited to Transferred Participants and Eligible Employees who make an Election to participate in the Plan by timely filing a Participation Agreement with the Committee. An Eligible Employee shall commence participation in the Plan
upon the first day of the Plan Year or Fiscal Year as the case may be, designated in his or her Participation Agreement filed with the Committee prior to the beginning of such Plan Year. 
 The Committee may in its sole discretion, allow in the case of the first Plan Year in which an individual becomes an Eligible Employee to make an initial Election to participate in the Plan and elect a
deferral with respect to Compensation or other amounts that become payable under the Plan for services to be performed after the Election; provided, that any Election by such an Eligible Employee shall be made within thirty (30) days after the
date he/she becomes eligible to participate in the Plan. 

  
 14 

 Participation of Transferred Participants shall be governed by Exhibit A. 

 

	3.3	Elections to Participate Irrevocable 

 A Participant may not change a previously elected percentage of Compensation deferred by an Election, or terminate his or her Election to participate in the Plan and defer Compensation for a Plan Year.
Except as may otherwise be determined and approved by the Committee pursuant to the Plan, a Participant’s Election to defer Compensation shall only be effective as of the beginning of the next Plan Year following receipt of the
Participant’s Election by the Corporation. Determinations on all Elections and of any effective dates other than as specified above, shall be made by the Committee in accordance with its prevailing administrative procedures. 

 

	3.4	Exclusion from Eligibility 

Notwithstanding any other provisions of this Plan to the contrary, if the Committee determines that any Participant may not qualify as a “management
or highly compensated employee” within the meaning of ERISA, or regulations thereunder, the Committee may determine, in its sole discretion, that such Participant shall cease to be eligible to participate in this Plan. 

ARTICLE IV. 

DEFERRAL OF COMPENSATION AND EXCESS AMOUNTS 
  

	4.1	Amount and Time of Election to Defer 

  

	 	(a)	Time of Election. A Participant’s Election to defer compensation for services performed during a Plan Year shall be made not later than the close of the
preceding Plan Year, or such other time as provided in Treasury Regulations published under Code section 409A; provided that in the case of the first Plan Year in which a Participant becomes eligible to participate in the Plan, such Election may be
made with respect to services to be performed subsequent to the Election within thirty (30) days after the Participant becomes eligible to participate in the Plan. A Participant’s Election to defer that part of Compensation which
constitutes Bonus that constitutes Performance-Based Compensation based on services over a period of at least twelve (12) months in and for a Plan Year shall be made no later than six (6) months before the end of that Plan Year to the
extent permitted by Code section 409A. 

  

	 	(b)	Participant Election Amounts. With respect to each Plan Year, a Participant may voluntarily elect the deferral of compensation by making an Election for deferral
of or within the percentages stated below, and subject to the terms described in Exhibit C attached hereto; provided, that each Participant who makes an Election for a Plan Year may elect a deferral that is within or consists of one (1) or more
of the following allowable percentages (in one percent (1%) increments) and types of compensation and amounts for that Plan Year, as applicable: 

  

	 	(1)	deferral of at least two percent (2%) and not more than ninety percent (90%) of the Participant’s Base Salary for the Plan Year;

  
 15 

	 	(2)	deferral of at least ten percent (10%) and not more than ninety percent (90%) of the Participant’s Bonus for the Plan Year; and 

 

	 	(3)	deferral of one hundred percent (100%) of each Qualified Employer Plan Excess Amount (except the Retirement Plan Excess Amount) to be accrued or deferred by or for
the Participant for the Plan Year. 

  

	 	(c)	Corporation Election Amounts. The Supplemental Credit Amount and Retirement Plan Excess Amount shall be deferred as elected and designated by the Corporation as
provided for in Sections 4.3(b) and 7.13, respectively, below. 

  

	 	(d)	Election Choices and Effect. The deferral and crediting of Compensation, a Qualified Employer Plan Excess Amount and/or Supplemental Credit Amount to the Account
of a Participant shall be made in respect of an Election of a Participant or the Corporation for a Plan Year as follows: 

  

	 	(1)	A Participant may elect to defer Base Salary or Bonus for services performed during a Plan Year. 

 

	 	(2)	A Participant who does not elect to defer Base Salary or Bonus for services performed during a Plan Year may nevertheless elect to defer a Qualified Employer Plan
Excess Amount, (except the Retirement Plan Excess Amount), which shall be deferred and credited to the extent applicable and as provided for and in accordance with Article V, below, for the Plan Year. 

 

	 	(3)	Notwithstanding any other provisions herein, a Participant shall be required to elect to defer and have credited all Qualified Employer Plan Excess Amounts (except the
Retirement Plan Excess Amount) to which he or she is or becomes entitled to for a Plan Year, and shall not be allowed to defer only one or several of the Qualified Employer Plan Excess Amounts and not others for a Plan Year.

  

	 	(e)	Except as otherwise expressly provided in the Plan in the case of mid-year Elections for new Participants, an Election to defer Base Salary, Bonus, Qualified Employer
Plan Excess Amounts or Supplemental Credit Amounts shall not become effective until the next Plan Year following such Election. Except as otherwise directed by the Committee, a Participant’s Base Salary and Bonus deferral Elections will remain
in effect for all subsequent Plan Years unless such Participant revokes or modifies any such Election in a manner consistent with this Article IV and applicable law. 

 

	 	(f)	 Notwithstanding anything herein or in any other plan document to the contrary, a Participant’s Election of a Qualified Employer Plan Excess Amount
for a Plan 

  
 16 

	 	
Year shall be determined as of the last business day before the Plan Year commences and shall remain fixed for the duration of that Plan Year. Accordingly, no change to the amounts deferred or
contributed by a Participant under another plan sponsored by the Corporation during a Plan Year shall have any effect on the Qualified Employer Plan Excess Amount deferred and credited under this Plan for the same Plan Year.

  

	4.2	Deferral Periods; Payment 

  

	 	(a)	Participant Elections of Specified Time of Distribution. Every Election made by a Participant shall include a specific election of the Participant of deferral of
Compensation (i) to be paid or distributed at a Specified Time or pursuant to a Fixed Schedule, and (ii) in a specific form of payment stated in the Election. 

 

	 	(b)	Deferral of Base Salary or Bonus. Subject to the requirements of Section 4.2(d), below, a Participant shall be allowed to defer Base Salary or Bonus under
the Plan by electing either a Long-Term Deferral or a Short-Term Deferral. The Participant shall elect and designate his or her deferral period as either a Long-Term Deferral or a Short-Term Deferral in the Election and Participation Agreement filed
by the Participant with the Committee for a Plan Year. 

  

	 	(c)	Qualified Employer Plan Excess Amounts, Supplemental Credit Amounts; Only Long-Term Deferral. Subject to the requirements of Section 4.4, below, every
Election to defer and credit with a Qualified Employer Plan Excess Amount and/or a Supplemental Credit Amount shall be a Long-Term Deferral. 

  

	 	(d)	Early Separation from Service. Notwithstanding the foregoing or any Specified Time or form of payment elected by a Participant in his/her Election or otherwise
elected and specified by the Corporation pursuant to Plan, or in any allowed Subsequent Election, in the event the Participant has an Early Separation from Service the Participant’s Plan Benefit shall be paid and distributed to the Participant
in a single lump sum payment at the Participant’s Early Separation from Service Time of Distribution, except for Short-Term Deferral installment payments that have already commenced, as described and provided in Section 7.7 of the Plan.
The time and form of payment in event of an Early Separation from Service is determined and specified by the Corporation under the Plan, and a Participant may not change or modify such time and form of payment, and may not elect otherwise by his/her
Election or any Subsequent Election. 

  

	 	(e)	The Investment Return and/or any other actual, notional or deemed earnings credited to a Participant’s Account pursuant to this Plan with respect to any Deferred
Compensation by an Election of a Participant or the Corporation shall be paid at the same time and in the same form of payment as the Participant has elected in his/her Election for such Deferred Compensation, and no separate election or time or
form of payment shall be allowed or occur with respect to the Investment Return or other earnings credited. 

  
 17 

	4.3	Committee Authority; Deferral of Compensation 

  

	 	(a)	General. Subject to the requirements of Section 4.4, below, the Committee may, in its sole discretion, determine and direct that the amount of deferral and
period of deferral which may be elected for Deferred Compensation, for any particular Plan Year or other period of service, be limited to an amount or amounts, and for a period or periods other than that which is otherwise generally provided herein.

  

	 	(b)	Supplemental Credit Amount. The Committee may elect to have a Supplemental Credit Amount credited to the Account of a Participant with respect to a Plan Year. A
Supplemental Credit Amount shall be established and deferred by irrevocable designation of the time and form of payment by the Corporation, by the written action and election of the Committee or its designee, which shall be made no later than the
later of the time the Participant becomes entitled to the amount thereof by such designation, or if later, the time the Participant would be required to make an election if the Participant were provided such election. The Corporation by this Plan
designates that each such Supplemental Credit Amount designated by it in a Plan Year shall be deferred for the same period, and be payable at the same Specified Time and in the same form of payment as the Long-Term Deferrals of and for a Participant
for that Plan Year. A Participant shall have no right or opportunity to make any election with respect to the amount, deferral and the time and form of payment of a Supplemental Credit Amount. 

 

	4.4	General Requirements for All Elections 

 Notwithstanding anything to the contrary expressed or, implied herein, the following requirements stated in this Section 4.4 shall apply to the Plan and to all Elections by Participants under the
Plan. 
  

	 	(a)	Time of Election. The deferral of Compensation for services performed by a Participant may be deferred by Election only if the Election to defer compensation
payable with respect to services performed by the Participant in the immediately following year is made and becomes irrevocable not later than the close of the Plan Year (December 31), or such other time as is provided for in Treasury Regulations
issued under Code section 409A. Each Election to defer Compensation shall be made not later than the close of the Participant’s taxable year preceding the service year. Provided, that in the case of the first year in which a Participant is
eligible to participate in the Plan, such Election may be made with respect to services to be performed subsequent to the Election within thirty (30) days after the date the Participant becomes eligible to the participate in the Plan. Provided,
further, in the case of any Performance-Based Compensation based on services performed over a period of at least twelve (12) months, such Election may be made on or before the date that is six (6) months before the end of the performance
period, provided that the Participant performs services continuously from the later of the beginning of the performance period or the date the performance criteria are established through the date an Election is made, and in no event may such an
Election to defer Performance-Based Compensation be made after such Performance-Based Compensation has become readily ascertainable. 

  

	 	(b)	Time and Form of Payment. Every Election to defer compensation shall include an election as to the Specified Time and form of payment and distribution of the
Compensation deferred. 

  
 18 

	4.5	Subsequent Elections 

  

	 	(a)	General. Any Subsequent Election that is made under the Plan to elect a delay in a payment or a change in the form of payment of compensation deferred by an
Election under the Plan, shall not take effect until at least twelve (12) months after the date on which it is made. In the case of a Subsequent Election related to a payment to be made upon Separation from Service of a Participant, at a
Specified Time or pursuant to a Fixed Schedule, or upon a Change in Ownership or Control, the first payment with respect to which Subsequent Election is made shall be deferred for a period of not less than five (5) years from the date such
payment would otherwise have been made, and any such Subsequent Election related to a payment at a Specified Time or pursuant to a Fixed Schedule may not be made less than twelve (12) months prior to the date of the first scheduled payment to
which it relates. No Subsequent Election that does not comply with the provisions of Code section 409A and Treasury Regulations shall be allowed to be made under the Plan. 

 

	 	(b)	A Participant by or for whom an Election to defer compensation has been made under the Plan may make a Subsequent Election to change the time of payment of such
deferred compensation by written instrument filed with the Committee in such form as it may prescribe at least twelve months (12) prior to the date of the first scheduled payment to which it relates. 

 

	 	(c)	A Participant who has not made any prior Subsequent Election to change the Normal Specified Time of Distribution of deferred compensation under the Plan provided for in
the Election shall be allowed to make a Subsequent Election applicable to such Normal Specified Time of Distribution in accordance with this Section 4.5 and the other provisions of the Plan. 

 

	 	(d)	A Participant who has made a prior Subsequent Election of a Subsequent Election Specified Time of Distribution of Deferred Compensation under the Plan shall be allowed
to make another Subsequent Election applicable to such Subsequent Election Specified Time of Distribution in accordance with this Section 4.5 and other provisions of the Plan. 

 

	 	(e)	A Participant shall not be authorized to make changes between Long-Term and Short-Term Deferrals elected or provided for in an Election by making a Subsequent Election.

  
 19 

	 	(f)	The Committee shall be authorized to administer, construe and interpret the foregoing provisions and the Plan with respect to all Subsequent Elections to assure
compliance with the intent thereof and the requirements of the Plan and of Code section 409A and Treasury Regulations. 

  

	 	(g)	Notwithstanding the foregoing provisions, the Committee, in its sole discretion, shall be authorized to determine, from time to time and/or in the particular case of
any one or more Participants, that a Subsequent Election not be allowed to be made to change the time of payment of deferred compensation under the Plan. 

  

	4.6	Crediting Deferred Base Salary and Bonus 

 The amount of Base Salary that a Participant elects to defer pursuant to an Election of the Participant under the Plan shall be credited by the Employer to the Participant’s Account monthly. The
amount of Bonus that a Participant elects to defer pursuant to an Election of the Participant under the Plan shall be credited by the Employer to the Participant’s Account at the time the Bonus would otherwise be paid or payable to the
Participant under the Incentive Plan pursuant to which such Bonus is paid or payable. 
  

	4.7	Crediting of Plan Excess Amounts 

The amount of any Qualified Employer Plan Excess Amount or Supplemental Credit Amount that a Participant or the Corporation elects to defer pursuant to an
Election of the Participant or the Corporation shall be credited in accordance with Article V, below. 
  

	4.8	FICA and Other Taxes 

 For each
Plan Year during which a Participant has deferrals, the Participant’s Employer shall, in a manner determined by the Employer, withhold the Participant’s share of FICA and other required employment or state, local, and foreign taxes on
deferrals from that portion of the Participant’s Base Salary or Bonus, and in the event of any Qualified Employer Plan Excess Amounts (except the Retirement Plan Excess Amount) or a Supplemental Credit Amount, the Participant’s
compensation generally, that is not deferred. To the extent permitted by Code section 409A, the Committee may reduce a Participant’s deferrals to the extent necessary to pay FICA and other employment, state, local and foreign taxes. 

ARTICLE V. 

PLAN EXCESS AMOUNTS 
  

	5.1	General 

  

	 	(a)	 Qualified Employer Plan Excess Amounts. There shall be deferred and credited to the Account of a Participant the Qualified Employer Plan Excess Amounts
(except the Retirement Plan Excess Amount) that apply to such Participant for the Plan Year by reason or and based upon his/her participation during the Plan Year in one or more qualified defined contribution plans or defined benefit plans of the

  
 20 

	 	
Corporation, as more particularly described and provided for in this Article V, including the Thrift Plan, Profit Sharing Plan and Retirement Plan. A Participant shall be entitled to defer and
have credited to his/her Account such Qualified Employer Plan Excess Amounts (except the Retirement Plan Excess Amount) to the extent he/she is a participant in the qualified plan of the Corporation and his/her participation in, and benefits under
such qualified plan come under and are affected in the manner described herein below. 

  

	 	(b)	Supplemental Credit Amount. There shall be deferred and credited to the Account of a Participant Supplemental Credit Amounts that apply to such Participant for the Plan
Year by reason or and based upon his/her entitlement thereto during the Plan Year as specified in the written authorization and direction of the deferral and credit thereof by the Corporation. A Participant shall be entitled to defer and have
credited to his/her Account such Supplemental Credit Amounts to the extent provided for in such authorization. 

  

	5.2	Thrift Plan Excess Employee Amount 

  

	 	(a)	The Employer shall provide and credit a Thrift Plan Excess Employee Amount elected under this Plan for each Participant making an Election thereof and eligible to make
and be allocated contributions under the Thrift Plan; except that the Committee may, in its discretion, prior to any Plan Year, make a determination not to provide for the election and crediting of Thrift Plan Excess Employee Amounts for that Plan
Year. 

  

	 	(b)	The Thrift Plan Excess Employee Amount under the Plan for each Participant under this Section 5.2 shall be credited by the Employer as soon as practicable after
the time the related contributions and allocations are made under the Thrift Plan, and no later than ninety (90) days after the end of the Plan Year that includes the time that the related contributions and allocations are made under the Thrift
Plan. 

  

	5.3	Thrift Plan Excess Matching Amount 

  

	 	(a)	The Employer shall provide and credit a Thrift Plan Excess Matching Amount elected under this Plan with respect to each Participant making an Election thereof and
eligible to be allocated matching contributions under the Thrift Plan; except that the Committee may, in its discretion, prior to any Plan Year, make a determination not to provide for the crediting of Thrift Plan Excess Matching Amounts for that
Plan Year. 

  

	 	(b)	The Thrift Plan Excess Matching Amount under the Plan for each Participant under this Section 5.3, above, shall be credited by the Employer as soon as practicable
after the time the related matching contributions are made under the Thrift Plan, and no later than ninety (90) days after the end of the Plan Year that includes the time that the related matching contributions are made under the Thrift Plan.

  
 21 

	5.4	Profit Sharing Plan Excess Amount 

  

	 	(a)	The Employer shall provide and credit a Profit Sharing Plan Excess Amount under this Plan with respect to each Participant making an Election thereof and eligible to be
allocated contributions under the Profit Sharing Plan; except that the Committee may, prior to any Plan Year, make a determination not to provide for the crediting of Profit Sharing Plan Excess Amounts for that Plan Year. 

 

	 	(b)	The Profit Sharing Plan Excess Amount under the Plan for each Participant under this Section 5.4, shall be credited by the Employer as soon as practicable after
the time the related contributions and allocations are made under the Profit Sharing Plan, and no later than ninety (90) days after the end of the Plan Year that includes the time that the related contributions and allocations are made under
the Profit Sharing Plan. 

  

	5.5	Retirement Plan Covered Compensation Excess Amount 

  

	 	(a)	The Employer shall provide and credit a Retirement Plan Covered Compensation Excess Amount elected and deferred under this Plan for each Participant making an Election
thereof and eligible to participate in the Retirement Plan, and not participating in the ONE Gas, Inc. Supplemental Executive Retirement Plan; except that the Committee may, in its discretion, prior to any Plan Year, make a determination not to
provide for the election and crediting of Retirement Plan Covered Compensation Excess Amounts for that Plan Year. 

  

	 	(b)	The Retirement Plan Covered Compensation Excess Amount under the Plan for a Participant under this Section 5.5 shall be credited by the Employer as soon as
practicable after the time the related accruals and contributions are made under the Profit Sharing Plan, and no later than ninety (90) days after the end of the Plan Year that includes the time that the related contributions and allocations
are made under the Profit Sharing Plan. 

  

	5.6	Supplemental Credit Amount 

  

	 	(a)	The Employer shall provide and credit a Supplemental Credit Amount if elected and deferred by the Corporation under this Plan for each Participant; except that the
Committee may, in its discretion, prior to any Plan Year, make a determination not to provide for the election and crediting of Supplemental Credit Amounts for that Plan Year. 

 

	 	(b)	The Supplemental Credit Amount under the Plan for a Participant under this Section 5.6 shall be credited by the Employer as soon as practicable after the beginning
of the Plan Year for which an election is made, and no later than ninety (90) days after the end of the Plan Year. 

  
 22 

	5.7	Required Elections to Defer Excess Amounts 

 The deferral, allowance, provision of and crediting of a Qualified Employer Plan Excess Amount shall be made and administered under this Plan if and to the extent elected by a Participant in such
Participant’s Election made pursuant to and in accordance with the terms and provisions of Article IV. Provided, that Retirement Plan Excess Amounts deferred under this Plan are separately provided for and made payable under the Plan pursuant
to and in accordance with Section 7.13 of the Plan; and Supplemental Credit Amounts are elected and made payable as determined by the Committee in accordance with Section 4.3(b) of the Plan. 

ARTICLE VI. 

BENEFIT ACCOUNTS 
  

	6.1	Determination of Account 

 As of
each Determination Date, a Participant’s Account shall consist of the balance of the Participant’s Account as of the immediately preceding Determination Date, plus the Participant’s Deferred Compensation credited pursuant to Article V
since the immediately preceding Determination Date, plus investment return credited as of such Determination Date pursuant to Section 6.2, minus the aggregate amount of distributions, if any, made from such Account since the immediately
preceding Determination Date. 
  

	6.2	Crediting of Investment Return; Other Items to Participant Accounts 

 The Account of each Participant shall be periodically credited and increased, or debited and reduced, as the case may be, by the amount of investment return specified under Section 6.3. The Account
of each Participant shall also be debited and credited for any deemed purchases or sales of, or other deemed transactions involving securities provided for under the Plan. The Account shall be so credited and debited not less frequently than monthly
in the manner established and determined from time to time by the Committee, in its sole discretion. The manner in which the Committee determines that a Participant’s Account shall be so debited or credited shall be described in written rules
or procedures which shall be stated from time to time by a written description thereof which shall be attached to this Plan as Exhibit “E,” and furnished to the Participants in the Plan. 

 

	6.3	Investment Return; Designated Deemed Investment 

 The Investment Return shall be determined in the manner specified in Exhibit “D” attached hereto. 

  
 23 

 To the extent the Investment Return specified in Exhibit “D” attached hereto, applied to a
Participant’s deferrals includes a rate that is to be determined from deemed investment of such Participant’s Account in investment options specified therein, the Committee shall prescribe the manner and form in which a Participant may
designate the deemed investment of deferrals and other amounts in his or her Account. A Participant will be allowed to change such designation of deemed investment monthly or with such other frequency as specified by the Committee, in its sole
discretion. Provided, that notwithstanding anything to the contrary stated or implied by the Plan, including all Exhibits thereto, the use, reference to or consideration of any such deemed investments made by the Committee or Plan, or designated by
Participants, the Committee and the Corporation shall not be obligated to make or cause to be made any particular type or form of investment with respect to the funding or payment of the Plan Benefits or Accounts of Participants under the Plan, and
no Participant shall have the right to direct or in any manner control any actual investments, if any, made by the Employer or any other person for purposes of providing funds for paying liabilities of the Employer for benefits or otherwise under
the Plan. No Participant shall have any ownership or beneficial interest in any such actual investments made by the Employer. 
  

	6.4	Statement of Account 

 The
Committee shall provide to each Participant a statement each calendar quarter setting forth the balance or balances of such Participant’s Account which have attributed an Investment Return as of the end of the calendar quarter showing all
adjustments made thereto during such calendar quarter. 
  

	6.5	Vesting of Participant Accounts 

Except as provided in Sections 10.1 and 10.2, below, a Participant shall be one hundred percent (100%) vested in his or her Account, at all times;
provided that the vesting of a Participant’s Retirement Plan Excess Amount shall be determined in like manner as the vesting of the Participant’s accrued benefit under the Retirement Plan. 

ARTICLE VII. 
 PAYMENT OF BENEFITS 
  

	7.1	Requirements for Distributions and Payments 

 Notwithstanding anything to the contrary expressed or implied herein, the following requirements stated in this Section 7.1 shall apply to the Plan, to all Elections or Subsequent Elections made by
Participants under the Plan, and to all distributions and payments made pursuant to the Plan. 
  

	 	(a)	Any Compensation deferred under the Plan shall not be distributed earlier than 

 

	 	(1)	Separation from Service of the Participant, 

  

	 	(2)	the date the Participant becomes Disabled, 

  
 24 

	 	(3)	death of the Participant, 

  

	 	(4)	a Specified Time (or pursuant to a Fixed Schedule) specified under the Plan at the date of deferral of such Compensation, 

 

	 	(5)	a Change in Ownership or Control, or 

  

	 	(6)	the occurrence of an Unforeseeable Emergency. 

  

	 	(b)	Notwithstanding the foregoing, if a Participant becomes entitled to a distribution on account of the Participant’s Separation from Service and is a Specified
Employee on the date of the Separation from Service, no distribution shall be made before the date which is six (6) months after the date of the Participant’s Separation from Service, or, if earlier, the date of death of such Participant.

  

	 	(c)	No acceleration of the time or schedule of any distribution or payment under the Plan shall be permitted or allowed, except to the extent provided in Treasury
Regulations issued under Code Section 409A. 

  

	 	(d)	A Participant may elect to change the time of commencement or change the form of payment of Compensation deferred under the Plan by filing a Subsequent Election in
accordance with Section 4.5 and rules, procedures and forms as may be specified from time to time by the Committee. 

  

	7.2	Payment of Plan Benefit; Long-Term Deferrals 

 Subject to the requirements stated in Section 7.1, above, and Section 7.7 below, a Long-Term Deferral of Deferred Compensation shall be paid and distributed to the Participant at the Normal
Specified Time of Distribution elected by a Participant (the Participant’s Separation from Service after attaining fifty (50) years of age and the completion of five (5) years of service with the Corporation). The Employer shall pay
to the Participant the Plan Benefit in the form of payment specified and elected in the Participant’s Election and Participation Agreement pursuant to Section 7.5. 

 

	7.3	Payment of Plan Benefit; Short-Term Deferrals 

 Subject to the requirements stated in Section 7.1, above, and Section 7.7 below, a Short-Term Deferral of Compensation elected by a Participant shall be paid and distributed to a Participant at
the Specified Time or pursuant to the Fixed Schedule designated and elected by the Participant in his or her Election and Participation Agreement. The Employer shall pay to the Participant the Plan Benefit in the form of benefit specified and
elected in the Participant’s Election pursuant to Section 7.5; provided, that no part of a Short-Term Deferral may be paid prior to five (5) years following the Participant’s Election thereof. 

  
 25 

	7.4	Specified Employee Six (6) Month Required Delay in Distribution and Payment 

 In the case of any Participant who is a Specified Employee as of the date of a Separation from Service, distribution and payments of any deferred compensation and Plan Benefit may not be made before the
date that is six (6) months after the date of Separation from Service (or, if earlier than the end of the six-month period, the date of death of the Specified Employee). For this purpose, a Participant who is not a Specified Employee as of the
date of a Separation from Service will not be treated as subject to this requirement even if the Participant would have become a Specified Employee if the Participant had continued to provide services through the next Specified Employee Effective
Date; and a Participant who is treated as a Specified Employee as of the date of a Separation from Service will be subject to this requirement even if the Participant would not have been treated as a Specified Employee after the next Specified
Employee Effective Date had the Specified Employee continued in employment with the Corporation through the next Specified Employee Effective Date. The required delay in payment is met if payments to which a Specified Employee would otherwise be
entitled during the first six (6) months following the date of Separation from Service are accumulated and paid on the first day of the seventh month following the date of Separation from Service, or if each payment to which a Specified
Employee is otherwise entitled upon a Separation from Service is delayed by six (6) months. The Committee shall have and retain discretion to choose which method will be implemented, provided that no direct or indirect election as to the method
may be provided to the Participant. For an affected Specified Employee, a date upon which the Committee or the Corporation designates that the payment will be made after the six-month delay is treated as a fixed payment date for purposes of the
other requirements of the Plan once the Separation from Service has occurred. 
  

	7.5	Form of Distribution and Payment 

The Plan Benefit payable to a Participant for Deferred Compensation shall be distributed and paid in one of the following forms, as elected by the
Participant in and at the time of his or her Election. 
  

	 	(a)	For Participants who elect a Long-Term Deferral, the Plan Benefit shall be distributed and paid in one of the following elected forms elected by the Participant in such
Election: 

  

	 	(1)	In annual payments of the vested Account balance, on and after the payment commencement date over a period of either five (5) or fifteen (15) years (together,
in the case of each annual payment, with Investment Return thereon credited after the payment commencement date pursuant to Section 6.2), with the amount of each such annual payment to be determined by multiplying the remaining principal amount
and undistributed income in the Participant’s Account by a fraction, the numerator of which is one (1) and the denominator of which shall be the number of remaining annual payments, including the payment then being calculated; or

  

	 	(2)	A lump sum. 

  
 26 

	 	(b)	For Participants who elect a Short-Term Deferral, the Plan Benefit shall be distributed and paid in one of the following forms elected by the Participant in such
Election: 

  

	 	(1)	Annual payments of a fixed amount which shall amortize the vested Account balance, on and after the payment commencement date over a period of from two (2) to four
(4) years (together, in the case of each annual payments with Investment Return thereon credited after the payment commencement date pursuant to Section 6.2), with the amount of each such annual payment to be determined by multiplying the
remaining principal amount and undistributed income in the Participant’s Account by a fraction, the numerator of which is one (1) and the denominator of which shall be the number of remaining annual payments, including the payment then
being calculated; or 

  

	 	(2)	A lump sum. 

  

	 	(c)	For any Participant who has an Early Separation from Service, the Plan Benefit shall be distributed in a single lump sum payment, except for Short-Term Deferral
installment payments that have already commenced, as provided for in Section 7.7 below. 

  

	7.6	Distribution and Payment for Subsequent Elections 

 If a Subsequent Election is made pursuant to the Plan, the payment and distribution shall be made at the Subsequent Election Time of Distribution that is elected and determined in and by such Subsequent
Election. 
  

	7.7	Distribution and Payment for Early Separation from Service  

 Subject to the requirements stated in Section 7.1, above, and notwithstanding the foregoing provisions in Sections 7.2 and 7.3, a Long-Term Deferral and/or Short-Term Deferral shall be paid and
distributed to a Participant upon his/her Early Separation from Service. The Employer shall pay to the Participant his/her Plan Benefit in a single lump sum payment equal to the balance of the Participant’s Account determined pursuant to
Article VI. This lump sum payment shall be made notwithstanding any other period or time of payment that has been elected by the Participant. Provided, that any installment payments of a Short-Term Deferral to the Participant that have commenced and
not been completed at such time shall continue to be paid in accordance with the existing schedule of payments. 
  

	7.8	Distribution and Payment of Plan Benefit Upon Disability 

  

	 	(a)	 Subject to the requirements stated in Section 7.1, above, if a Participant becomes Disabled, the Participant’s Account shall be paid to the
Participant, or the Participant’s personal representative, upon the date the Participant is determined by the Committee to be Disabled. The Participant’s Account shall be distributed in accordance with the Participant’s Long-Term
Deferral and Short-Term Deferral 

  
 27 

	 	
Elections if the Participant has attained the age of fifty (50) years and completed five (5) years of service with the Corporation upon the date the Participant is determined Disabled.
If the Participant has not attained the age of fifty (50) years and completed five (5) years of service with the Corporation as of the date the Participant is determined to be Disabled, the Participant’s Account shall be paid in a
lump sum. Notwithstanding the foregoing, any installment payments of a Short-Term Deferral to the Participant that have commenced and not been completed at such time shall continue to be paid in accordance with the existing schedule of payments.

  

	 	(b)	Notwithstanding any other provisions of the Plan, if a Participant becomes disabled, the Committee may, in its sole discretion, cancel the Participant’s deferral
Election with respect to amounts to be deferred on or after the cancellation, by the end of the year during which the Participant becomes disabled, or if later, the 15th day of the third month following the date the Participant becomes disabled. For
purposes of this Section 7.8(b), a Participant shall be disabled if the Participant is suffering from any medically determinable physical or mental impairment resulting in the Participant’s inability to perform the duties of his or her
position or any substantially similar position, if such impairment can be expected to result in death or can be expected to last for a continuous period of not less than six (6) months. The Participant may elect to defer amounts for the Plan
Year following his return to employment and for every Plan Year thereafter while an Eligible Employee, provided the Participant’s deferral election complies with all the requirements of the Plan. 

 

	7.9	Distribution and Payment of Plan Benefit Upon Death 

 Subject to the requirements stated in Section 7.1, above, upon the death of a Participant the Participant’s Account shall be paid to the Participant’s Beneficiary. If the Participant has
elected Long-Term Deferral, the Plan Benefit shall be paid to the Beneficiary over the time period elected by the Participant commencing as soon as practicable after the time of death of the Participant. If the Participant has elected a Short-Term
Deferral, the Plan Benefit shall be paid to the Beneficiary in a single lump sum payment. However, the Retirement Plan Excess Amount will be paid to the same beneficiary as the Retirement Plan benefit. 

 

	7.10	Payment of Deferrals for Unforeseeable Emergency 

 Subject to the requirements stated in Section 7.1, above, a Participant may submit a written request for a distribution on account of an Unforeseeable Emergency. Upon approval by the Committee of a
Participant’s request, the Participant’s Account, or that portion of the Participant’s Account deemed necessary by the Committee to satisfy the Unforeseeable Emergency (determined in a manner consistent with Code section 409A) plus
amounts necessary to pay taxes reasonably anticipated as a result of the distribution, will be distributed in a single lump sum payment. In addition, the Participant must continue to defer Compensation subsequent to such distribution in accordance
with the Participant’s Election and will not be permitted to elect to defer Compensation attributable to the calendar year subsequent to the calendar year of the distribution. The Committee shall have the sole discretion as to whether such
distribution shall be made, and its determination shall be final and conclusive. In making its determinations, the Committee shall follow a uniform and nondiscriminatory practice. 

  
 28 

	7.11	Commencement of Distributions and Payments 

  

	 	(a)	Subject to the requirements stated in Section 7.1, above, and except as otherwise provided in Section 7.2, the commencement of payments under Sections 7.2
through 7.4 shall begin at the time specified by the Participant in his or her Election and Participation Agreement consistent with the terms and provisions of the Plan or Subsequent Election, and distributions required upon distribution events
described in Sections 7.7 through 7.10 shall commence at the time provided in the Plan or Subsequent Election (if applicable). 

  

	 	(b)	Except as otherwise expressly specified in the Plan, a distribution or payment shall be treated as made upon the date specified under the Plan if the payment is made at
such date or a later date within the same taxable year of the Participant or, if later, by the 15th day of the third calendar month following the date specified under the Plan and the Participant is not permitted, directly or indirectly, to
designate the taxable year of the payment. In addition, a distribution or payment shall be treated as made upon the date specified under the Plan and shall not treated as an accelerated payment if the payment is made no earlier than thirty
(30) days before the designated payment date and the Participant is not permitted, directly or indirectly to designate the taxable year of the payment. For purposes of this paragraph, if the date specified is only a designated taxable year of
the Participant, or a period of time during such a taxable year, the date specified under the Plan is treated as the first day of such taxable year or the first day of the period of time during such taxable year, as applicable. If calculation of the
amount of the distribution or payment is not administratively practicable due to events beyond the control of the Participant (or Participant’s beneficiary), the distribution or payment will be treated as made upon the date specified under the
Plan if the distribution or payment is made during the first taxable year of the Participant in which the calculation of the amount of the distribution or payment is administratively practicable. For purposes of this section, the inability of a
Corporation to calculate the amount or timing of a distribution or payment due to a failure of a Participant (or Participant’s beneficiary) to provide reasonably available information necessary to make such calculation does not constitute an
event beyond the control of the Participant. 

  

	 	(c)	If a Participant elects to receive distributions in annual installments, the Participant’s Account or portion thereof will be paid in substantially equal annual
installments in consecutive years over the period elected by the Participant. During the Plan Year in which distributions commence, the Participant will receive the first installment commencing as described in Section 7.11(a) and each
subsequent annual installments shall be paid in the year in which it is due after the first day of the month following the anniversary date of the commencement date. Any installment distribution that complies with Section 7.11(b) shall be
deemed for all purposes to comply with the Plan requirements regarding the time and form of distributions. 

  
 29 

	7.12	No Acceleration of Distribution and Payment 

 No acceleration of the time or schedule of any payment or amount scheduled to be paid pursuant to the terms of the Plan shall be allowed, and no such accelerated payment may be made whether or not
provided for under the expressed or implied terms of such Plan. Provided, that there may be an acceleration of a payment in accordance with the express provisions allowing the same under the Treasury regulations issued under Code Section 409A
or the Committee may have discretion to permit such acceleration to be made consistent with the regulations. Provided, that a Participant shall have no discretion with respect to whether a payment will be accelerated, and the Corporation or
Committee shall not provide a Participant a direct or indirect election as to whether the Corporation’s or Committee’s discretion to accelerate a payment will be exercised, even if such acceleration would be permitted under the
regulations. 
  

	7.13	Retirement Plan Excess Amount 

Subject to the requirements stated in Section 7.1, above, the Corporation shall pay to a Participant or his or her survivor Beneficiary, as the case
may be, a Retirement Plan Excess Amount elected to be deferred and credited for the Participant by the Corporation that shall be equal to the amount by which such Participant’s retirement benefit under the Retirement Plan is reduced by reason
of the deferred Compensation elected by the Participant under the Plan not being taken into account in the calculation of such Participant’s retirement benefit under the Retirement Plan, but only if such deferred Compensation is not taken into
account in determining a retirement benefit or payment payable to such Participant under the ONE Gas, Inc., Supplemental Executive Retirement Plan (SERP), nor under any other plan, arrangement or agreement of the Corporation other than this Plan.

 The Retirement Plan Excess Amount payable to a Participant, or his or her Beneficiary, under this Section 7.13 shall be paid commencing
at the date of the Participant’s Normal Specified Time of Distribution under this Plan and the amount thereof shall be calculated pursuant to the Retirement Plan benefit formula in the manner it would be calculated if the Participant commenced
payment of his/her Retirement Plan benefits at that time. However, if Participant is a SERP participant, the time and form of payment of the Participant’s Retirement Plan Excess Amount under this Plan shall be the time and form of payment that
the Participant has made or makes under the SERP as to the time and form of payment of his/her benefits under the SERP; provided that such election under the SERP shall be considered an election by the Participant under this Plan that is subject to
application of all pertinent requirements, restrictions and limitations of this Plan with respect to the time of making and effect of an Election or Subsequent Election, and/or the prohibition of an acceleration of payment of the Retirement Plan
Excess Amount; and provided further, that to the extent that such an election would not comply with any of such requirements, restrictions or limitations, the time of payment shall be the Normal Specified Time of Distribution. The Retirement Plan
Excess Amount shall be paid in the form of a 50% joint and survivor annuity, as defined in the Retirement Plan, if the Participant is 

  
 30 

 
married at the time of the Corporation’s Election to credit the Participant’s Account with a Retirement Plan Excess Amount, and shall be paid in the form of a single (straight) life
annuity, as defined in the Retirement Plan, if the Participant is single at the time of the Corporation’s Election. The form of payment can be changed by Participant prior to commencement to another actuarially equivalent form of monthly
annuity. 
 ARTICLE VIII. 
 BENEFICIARY DESIGNATION 
  

	8.1	Beneficiary Designation 

 Each
Participant shall have the right, at any time, to designate any person or persons as his or her Beneficiary to whom payment under the Plan shall be made in the event of the Participant’s death prior to complete distribution to the Participant
of his or her Account; provided, that the Retirement Plan Excess Amount shall be paid to the Participant’s beneficiary for Retirement Plan benefits. Any Beneficiary designation shall be made in a written instrument provided by the Committee.
All Beneficiary designations must be filed with the Corporation and shall be effective only when received in writing by the Corporation. 
  

	8.2	Amendments 

 Any Beneficiary
designation may be changed by a Participant by the filing of a new Beneficiary designation, which will cancel all the Participant’s prior Beneficiary designations filed with the Committee. 

 

	8.3	No Designation 

 If a Participant
fails to designate a Beneficiary as provided above, or if all designated Beneficiaries predecease the Participant, then the Participant’s designated Beneficiary shall be deemed to be the Participant’s estate. 

 

	8.4	Effect of Payment 

 Payment to a
Participant’s Beneficiary (or, upon the death of a primary Beneficiary, to the contingent Beneficiary or, if none, to the Participant’s estate) shall completely discharge the Employer’s obligations under the Plan. 

ARTICLE IX. 

ADMINISTRATION 
  

	9.1	Plan Committee; Authority and Duties 

  

	 	(a)	The Plan shall be administered by the Committee, which shall consist of not less than three (3) members, appointed from time to time by the Board to serve at the
pleasure of the Board. 

  
 31 

	 	(b)	Notwithstanding anything to the contrary expressed or implied herein, no member of the Committee shall have any right or authority to act, vote or decide upon any
matter relating solely to such member under the Plan, or to act, vote upon or decide any issue or case in which such member’s individual right to receive any Compensation under the Plan is particularly involved, or to take any action that would
change or accelerate the deferral or payment of Compensation or benefits to such member in a manner or at a time not provided for under the Plan. In any case in which a member of the Committee is so disqualified to act and the remaining members
cannot agree, or in any case where a majority or all of the members of the Committee are so disqualified, the Board (or a separate subset thereof) shall appoint a substitute member or members of the Committee to exercise all powers of the
disqualified member or members concerning the matter involved, or in the alternative the Board (or a separate subset thereof) may, in its discretion, assume authority to act upon and decide the issues and case involved, with any such action and
decision by it to be final and binding with respect to the Plan, Participants or other persons involved. 

 The
Committee and its members shall have no discretion to allow or cause distribution or payment of the Account or any deferred compensation to any Participant at a time or in a form or manner that is not in accordance with the terms and provisions of
the Plan, including the requirements of Section 7.1, above, and the requirements of Code Section 409A. 
  

	 	(c)	The Committee shall supervise the administration and operation of the Plan, may from time to time adopt rules and procedures governing the Plan and shall have authority
to give interpretive rulings with respect to the Plan. The Committee shall have such other powers and duties as are specified in this Plan as the same may from time to time be constituted, and not in limitation but in amplification of the foregoing,
the Committee shall have power, in its discretion to the exclusion of all other persons, to interpret the provisions of this instrument, to decide any disputes which may arise hereunder; to construe and determine the effect of Participant
Agreements, Elections, beneficiary designations, and other actions and documents; to determine, in its discretion, all questions that shall arise under the Plan, including questions as to the rights of Employees to become Participants, as to the
rights of Participants, any Beneficiary or other person with respect to the Plan, and including questions submitted by the trustee of a Trust created under Section 11.2 on all matters necessary for it properly to discharge its duties, powers,
and obligations; to employ legal counsel, accountants, consultants and agents; to establish and modify such rules, procedures and regulations for carrying out the provisions of the Plan not inconsistent with the terms and provisions hereof, as the
Committee, in its discretion, may determine; and in all things and respects whatsoever, without limitation, to direct the administration of the Plan and any such Trust with the trustee being subject to the direction of the Committee.

  
 32 

	 	(d)	The Committee may supply any omission or reconcile any inconsistency in this instrument in such manner and to such extent as it shall deem expedient to carry the same
into effect and it shall be the sole and final judge of such expediency. 

  

	 	(e)	The Committee may adopt such rules and regulations with respect to the signature by an Employee, Participant and/or Beneficiary as to any agreements, Elections or other
papers to be signed by Employees or Participants or Beneficiaries and similar matters as the Committee shall determine in view of the laws of any state or states. 

 

	 	(f)	The Committee shall maintain or cause to be maintained complete and adequate records pertaining to the Plan, including but not limited to the Accounts of Participants,
all matters involving any Trust of the Plan, and all other records which the Committee in its discretion determines are necessary or desirable in the administration of the Plan. 

 

	 	(g)	Any act which the Plan authorizes or requires the Committee to do may be done by a majority of the then members of the Committee. The action of such majority of the
members expressed either by a vote at a meeting or in writing without a meeting, shall constitute the action of the Committee and shall have the same effect for all purposes as if assented to by all of the members of the Committee at the time in
office, provided, however, that the Committee may, in specific instances, authorize one (1) of its members to act for the Committee when and if it is found desirable and convenient to do so. 

 

	9.2	Delegation; Agents 

 The Committee
may, at its discretion, delegate discretionary authority for day-to-day administration of the Plan to the Company’s Benefit Plan Administration Committee or its authorized representatives pursuant to a duly adopted resolution or a memorandum of
action signed by all members of the Committee or approved via electronic transmission. All actions taken by the Company’s Benefit Plan Administration Committee or its authorized representative shall have the same legal effect and shall be
entitled to the same deference as if taken by the Committee itself. In addition, the Committee or its delegate may, from time to time, employ other agents and delegate to them such administrative duties as it sees fit, and may from time to time
consult with counsel who may be counsel to the Corporation. 
  

	9.3	Binding Effect of Decisions 

 Any
decision or action of the Committee with respect to any question arising out of or in connection with the administration, interpretation and application of the Plan shall be final and binding upon all persons having any interest in the Plan.

  

	9.4	Indemnity of Committee 

 The
Corporation shall indemnify and hold harmless the members of the Committee and their agents duly appointed under Section 9.2 against any and all claims, loss, damage, expense or liability arising from any action or failure to act with respect
to the Plan, except in the case of gross negligence or willful misconduct by any such member or agent of the Committee. 

  
 33 

 ARTICLE X. 
 AMENDMENT AND TERMINATION OF PLAN 
  

	10.1	Amendment 

  

	 	(a)	The Corporation, on behalf of itself and of each Subsidiary may by action of the Board at any time amend, modify, suspend or reinstate any or all of the provisions of
the Plan, except that no such amendment, modification, suspension or reinstatement may adversely affect any Participant’s Account, as it existed as of the day before the effective date of such amendment, modification, suspension or
reinstatement, without such Participant’s prior written consent. 

  

	 	(b)	The Plan may also be so amended or modified by resolution of the Committee or by the Committee executing a written instrument containing such amendment or modification
(pursuant to authority which has been duly delegated to the Committee by the Board and is hereby acknowledged and recognized); provided, that no amendment or modification of the Plan to increase any compensation of or benefits provided to
Participants under the Plan, and no termination of the Plan shall be made unless such amendment or modification, or termination, is authorized pursuant to a resolution duly adopted by the Board. Any action by resolution or a written instrument by
the Committee shall be presumed to be effective without necessity of further action or approval of the Board. In the event any issue should arise with respect to respective authority of the Committee, or of the Board, and amendments or modifications
of the Plan made by them that are or appear to be inconsistent, final authority shall be reserved to and exercisable by the Board and its action to amend or modify the Plan shall take precedence. 

 

	10.2	Termination 

 The Corporation, on
behalf of itself and of each Subsidiary, in its sole discretion, may by action pursuant to a resolution adopted by the Board terminate this Plan at any time and for any reason, with or without prior notice. Upon termination of the Plan, the
Committee shall take those actions necessary to administer any Participant Accounts existing prior to the effective date of such termination; provided, however, that a termination of the Plan shall not adversely affect the value of a
Participant’s Account or the crediting of investment return under Section 6.2 without the Participant’s prior written consent. 

  
 34 

 ARTICLE XI. 
 PLAN EFFECT, LIMITATIONS, 
 MISCELLANEOUS PROVISIONS 

 

	11.1	Nature of Employer Obligation; Funding 

 Participants, their Beneficiaries, and their heirs, successors and assigns, shall have no secured interest or claim in any property or assets of the Employer. The Employer’s obligation under the Plan
shall be merely that of an unfunded and unsecured promise of the Employer to pay money in the future. 
  

	11.2	Trusts; Transfers of Assets, Property 

  

	 	(a)	Notwithstanding the foregoing, in the event of a Change in Ownership or Control, the Corporation shall create an irrevocable Trust, or before such time the Corporation
may create an irrevocable or revocable Trust, to hold funds to be used in payment of the obligations of Employers under the Plan. 

  

	 	(b)	Notwithstanding anything otherwise expressed or implied herein, in the case of any assets set aside (directly or indirectly) in a such a Trust (or other arrangement
determined by Treasury Regulations or otherwise pursuant to Code Section 409A) for purposes of paying deferred compensation under the Plan, no such assets (or such a Trust or other arrangement) shall ever be located or transferred outside the
United States. 

  

	 	(c)	In the event of a Change in Ownership or Control or prior thereto, the Employers shall fund such Trust in an amount equal to not less than the total value of the
Participants’ Accounts under the Plan as of the Determination Date immediately preceding the Change in Ownership or Control, provided that any funds contained therein shall remain liable for the claims of the general creditors of the respective
Employers. 

  

	 	(d)	Pursuant to this Section 11.2, the Corporation may, without further reference to or action by any Employee, Participant, or any Beneficiary from time to time enter
into such further agreements with a trustee or other parties, and make such amendments to said trust agreement or such further agreements, as the Corporation may deem necessary or desirable to carry out the Plan; from time to time designate
successor trustees of such a Trust; and from time to time take such other steps and execute such other instruments as the Corporation may deem necessary or desirable to carry out the Plan. The Committee shall advise the trustee of any such Trust in
writing with respect to all Plan Benefits which become payable under the terms of the Plan and shall direct the trustee to pay such Plan Benefits from the respective Participants’ Accounts, and the Committee shall have authority to otherwise
deal with and direct the trustee of such a Trust in matters pertinent to the Plan. 

  
 35 

	 	(e)	It is intended that any Trust created hereunder is to be treated as a “grantor” trust under the Code, and the establishment of such a Trust is not intended to
cause a Participant to realize current income on amounts contributed thereto, such a Trust is not intended to cause the Plan to be “funded” under ERISA and the Code, and any such Trust shall be so interpreted, and such Trust shall be
funded in a manner that assets set aside or transferred to such Trust shall not be treated under Code Section 409A as property transferred in connection with the performance of services by reason of such assets being located or transferred
outside the United States. 

  

	 	(f)	Notwithstanding anything to the contrary expressed or implied herein, no transfer of assets shall be made under or in connection with the Plan or Compensation deferred
under the Plan that would constitute a transfer of property within the meaning of Code Section 83 with respect to such Compensation by reason of such assets becoming restricted to the provision of benefits under the Plan in connection with a
change in the Corporation’s financial health, as provided for under Code Section 409A, and Treasury Regulations issued thereunder. 

  

	11.3	Nonassignability 

 No right or
interest under the Plan of a Participant or his or her Beneficiary (or any person claiming through or under any of them), shall be assignable or transferable in any manner or be subject to alienation, anticipation, sale, pledge, encumbrance or other
legal process or in any manner be liable for or subject to the debts or liabilities of any such Participant or Beneficiary. If any Participant or Beneficiary shall attempt to or shall transfer, assign, alienate, anticipate, sell, pledge or otherwise
encumber his or her benefits hereunder or any part thereof, or if by reason of his or her bankruptcy or other event happening at any time such benefits would devolve upon anyone else or would not be enjoyed by him or her, then the Committee, in its
discretion, may terminate such Participant’s or Beneficiary’s interest in any such benefit (including the Account) to the extent the Committee considers necessary or advisable to prevent or limit the effects of such occurrence. Termination
shall be effected by filing a written instrument with the Secretary of the Corporation and making reasonable efforts to deliver a copy to the Participant or Beneficiary whose interest is adversely affected (the “Terminated Participant”).

 As long as the Terminated Participant is alive, any benefits affected by the termination shall be retained by the Employer and, in the
Committee’s sole and absolute judgment, may be paid to or expended for the benefit of the Terminated Participant, his or her spouse, his or her children or any other person or persons in fact dependent upon him or her in such a manner as the
Committee shall deem proper. Upon the death of the Terminated Participant, all benefits withheld from him or her and not paid to others in accordance with the preceding sentence shall be disposed of according to the provisions of the Plan that would
apply if he or she died prior to the time that all benefits to which he or she was entitled were paid to him or her. 

  
 36 

	11.4	Captions 

 The captions contained
herein are for convenience only and shall not control or affect the meaning or construction hereof. 
  

	11.5	Code Section 409A 

 The Corporation
intends that the Plan comply with the requirements of Code section 409A and shall be operated and interpreted consistent with that intent. Notwithstanding the foregoing, the Corporation makes no representation that the Plan complies with Code
section 409A and shall have no liability to any Participant for any failure to comply with Code section 409A. 
  

	11.6	Governing Law 

 The provisions of
the Plan shall be construed and interpreted according to the laws of the State of Oklahoma except to the extent preempted by ERISA. 
  

	11.7	Successors 

 The provisions of the
Plan shall bind and inure to the benefit of the Corporation, its Subsidiaries, and their respective successors and assigns. The term “successors” as used herein shall include any corporate or other business entity which shall, whether by
merger, consolidation, purchase or otherwise, acquire all or substantially all of the business and assets of the Corporation or a Subsidiary and successors of any such corporation or other business entity. 

 

	11.8	No Right to Continued Service 

Nothing contained herein shall be construed to confer upon any Eligible Employee the right to continue to serve as an Eligible Employee of the Employer or
in any other capacity. 

  
 37EX-10.9

 Exhibit 10.9 
 ONE GAS, INC. 
 PRE-2005 SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

 (Effective January 1, 2014) 

 ONE GAS, INC. PRE-2005 SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN 

Table of Contents 
  

					
	 	 	Page	 
		
	 ESTABLISHMENT AND PURPOSE
	 	 	1	  
		
	 ARTICLE I. DEFINITIONS AND CONSTRUCTION
	 	 	2	  
		
	 ARTICLE II. ELIGIBILITY AND PLAN AGREEMENTS
	 	 	8	  
		
	 ARTICLE III. DEATH BENEFIT
	 	 	9	  
		
	 ARTICLE IV. RETIREMENT BENEFIT
	 	 	9	  
		
	 ARTICLE V. BENEFICIARY
	 	 	13	  
		
	 ARTICLE VI. LEAVE OF ABSENCE
	 	 	14	  
		
	 ARTICLE VII. SOURCE OF BENEFITS
	 	 	14	  
		
	 ARTICLE VIII. TERMINATION OF EMPLOYMENT
	 	 	15	  
		
	 ARTICLE IX. TERMINATION OF PARTICIPATION
	 	 	16	  
		
	 ARTICLE X. TERMINATION, AMENDMENT, MODIFICATION, OR SUPPLEMENT OF THE PLAN
	 	 	16	  
		
	 ARTICLE XI. TREATMENT OF BENEFITS
	 	 	17	  
		
	 ARTICLE XII. RESTRICTIONS ON ALIENATION OF BENEFITS
	 	 	17	  
		
	 ARTICLE XIII. ADMINISTRATION OF THE PLAN
	 	 	18	  
		
	 ARTICLE XIV. ADOPTION OF PLAN BY SUBSIDIARY, AFFILIATED OR ASSOCIATED COMPANIES
	 	 	19	  
		
	 ARTICLE XV. EXCESS RETIREMENT BENEFIT PAYMENTS COMMENCED BEFORE SEPTEMBER 1, 1998
	 	 	20	  
		
	 ARTICLE XVI. MISCELLANEOUS
	 	 	20	  
		
	 EXHIBIT A
	 	 	22	  
		
	 EXHIBIT B
	 	 	24	  
		
	 APPENDIX I CHANGE OF BENEFICIARY FORM FOR ONE GAS, INC. PRE-2005 SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN
	 	 	25	  
		
	 CONSENT OF SPOUSE
	 	 	26	  

  
 - i -

 ONE GAS, INC. PRE-2005 SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN 

ESTABLISHMENT AND PURPOSE 
 On November 13, 2013, in anticipation of the Separation that is proposed to occur in 2014, the Board of Directors of ONEOK approved the (1) the establishment, effective January 1, 2014, of
a supplemental executive retirement plan that is substantially similar to the ONEOK Frozen SERP for the benefit of ONE Gas Employees and Former ONE Gas Employees; (2) the exclusion of ONE Gas Employees and Former ONE Gas Employees from
participating in the ONEOK Frozen SERP for periods after December 31, 2013; and (3) the transfer of liabilities for ONE Gas Employees and Former ONE Gas Employees who are participants in the ONEOK Frozen SERP to this Plan effective
January 1, 2014. 
 By unanimous consent, the Board of Directors of ONE Gas has approved the adoption of this Plan,
effective January 1, 2014, for the benefit of certain ONE Gas Employees and Former ONE Gas Employees who were members of a select group of management or highly compensated employees of any member of the ONEOK Group as of December 31, 2004.
The Plan is established to receive liabilities transferred from the ONEOK Frozen SERP. The purpose of the Plan is to provide the specified benefits to ONE Gas Employees and Former ONE Gas Employees who were participants in the ONEOK Frozen SERP.

 Effective January 1, 2014, all liabilities attributable to ONE Gas Employees and Former ONE Gas Employees under the
ONEOK Frozen SERP are transferred and accepted by this Plan. For periods after December 31, 2013, (1) ONE Gas Employees and Former One Gas Employees shall not be eligible to participate in the ONEOK Frozen SERP; (2) the ONEOK Frozen
SERP and any successors thereto shall have no further obligation or liability to any ONE Gas Employee or Former ONE Gas Employee with respect to any benefit, amount or right accrued under the ONEOK Frozen SERP; and (3) this Plan is liable for
the payment of any benefits accrued by ONE Gas Employees and Former ONE Gas Employees under the ONEOK Frozen SERP. No individual is entitled to a benefit under both this Plan and the ONEOK Frozen SERP. 

The terms and conditions of this Plan are substantially the same as the terms and conditions of the ONEOK Frozen SERP. Exhibit A to the
Plan sets forth additional rules applicable to Transferred Participants. Notwithstanding anything to the contrary in the Plan, no person other than Transferred Participants shall be eligible to participate in the Plan. 

This Plan is separate from the ONE Gas SERP, which ONE Gas established to receive liabilities transferred from the ONEOK 2005 SERP in
connection with the Separation. No individual is entitled to a benefit under both this Plan and the ONE Gas SERP. 
 This Plan
and the particular benefits provided to individuals hereunder shall be administered as an unfunded nonqualified deferred compensation and excess benefit plan. The Plan, and benefits hereunder, are intended to be excepted from the requirements of
Section 409A of the Code as a “grandfathered plan” because the Plan benefits were earned and vested prior to January 1, 2005. Specifically, the ONEOK Frozen SERP was frozen to new participants and new accruals after
December 31, 2004. Accordingly, no additional benefits were accrued by the Transferred Participants under the ONEOK Frozen SERP after December 31, 2004, and no additional benefits will be accrued under this Plan by any such Transferred
Participants. 

 The Plan is effective January 1, 2014. 

The capitalized words and terms in this Plan document shall have the meaning given in the definitions stated in Article I of the Plan,
unless otherwise expressly indicated. 
 ARTICLE I. 
 DEFINITIONS AND CONSTRUCTION 
  

	1.1	Definitions. For purposes of the Plan, the following phrases or terms shall have the indicated meanings unless otherwise clearly apparent from the context:

  

	 	A.	“Base Cash Compensation” shall mean the regular monthly salary paid to a Participant by ONEOK before any deductions or exclusions for taxes or other
purposes, and excluding any vehicle allowance, incentives, commissions and any other special pay. 

  

	 	B.	“Beneficiary” shall mean the individual or individuals, or any trust or trusts, or the estate of a Participant entitled to receive any benefits under a
Plan Agreement entered into in accordance with the terms of the Plan. 

  

	 	C.	“Board of Directors” shall mean the Board of Directors of ONE Gas, Inc., unless otherwise indicated or the context otherwise requires.

  

	 	D.	“Change in Control” shall mean the occurrence of any of the following: 

 

	 	(1)	 An acquisition (other than directly from the Company) of any voting securities of the Company (the “Voting Securities”) by any
“Person” (as the term person is used for purposes of Section 13(d) or 14(d) of the Exchange Act), immediately after which such Person has “Beneficial Ownership” (within the meaning of Rule 13d-3 promulgated under the
Exchange Act) of twenty percent (20%) or more of the then outstanding Shares or the combined voting power of the Company’s then outstanding Voting Securities; provided, however, in determining whether a Change
in Control has occurred pursuant to this Section 1.1(D), Shares or Voting Securities which are acquired in a “Non-Control Acquisition” (as hereinafter defined) shall not constitute an acquisition which would cause a Change in Control.
A “Non-Control Acquisition” shall mean an acquisition by (i) an employee benefit plan (or a trust forming a part thereof) maintained by (A) the Company or (B) any company or other Person of which a majority of its voting
power or its voting equity securities or equity interest is owned or controlled, directly or indirectly, by the Company (for purposes of this definition, a “Related Entity”), (ii)

  
 - 2 -

	 	
the Company or any Related Entity, or (iii) any Person in connection with a “Non-Control Transaction” (as hereinafter defined); 

 

	 	(2)	The individuals who, as of January 1, 2014, are members of the Board of Directors (the “Incumbent Board”), cease for any reason to constitute at least a
majority of the members of the Board of Directors; or, following a Merger which results in a Parent Company, the board of directors of the ultimate Parent Company; provided, however, that if the election, or nomination for
election by the Company’s common stockholders, of any new director was approved by a vote of at least two-thirds of the Incumbent Board, such new director shall, for purposes of this Plan, be considered as a member of the Incumbent Board;
provided further, however, that no individual shall be considered a member of the Incumbent Board if such individual initially assumed office as a result of either an actual or threatened “Election Contest” (as
described in Rule 14a-11 promulgated under the Exchange Act) or other actual or threatened solicitation of proxies or consents by or on behalf of a Person other than the Board of Directors (a “Proxy Contest”), including by reason of any
agreement intended to avoid or settle any Election Contest or Proxy Contest; or 

  

	 	(3)	The consummation of: 

 (i) A
merger, consolidation or reorganization with or into the Company or in which securities of the Company are issued (a “Merger”), unless such Merger is a “Non-Control Transaction.” A “Non-Control Transaction” shall mean a
Merger where: 
 (A) the stockholders of the Company, immediately before such Merger, own directly or indirectly
immediately following such Merger at least fifty percent (50%) of the combined voting power of the outstanding voting securities of (x) the company resulting from such Merger (the “Surviving Company”) if fifty percent
(50%) or more of the combined voting power of the then outstanding voting securities of the Surviving Company is not Beneficially Owned, directly or indirectly by another Person (a “Parent Company”), or (y) if there is one or
more Parent Companies, the ultimate Parent Company; 
 (B) the individuals who were members of the Incumbent
Board immediately prior to the execution of the agreement providing for such Merger constitute at least a majority of the members of the board of directors of (x) the Surviving Company, if there is no Parent Company, or (y) if there is one
or more Parent Companies, the ultimate Parent Company; and 

  
 - 3 -

 (C) no Person other than (1) the Company, (2) any Related Entity,
(3) any employee benefit plan (or any trust forming a part thereof) that, immediately prior to such Merger was maintained by the Company or any Related Entity, or (4) any Person who, immediately prior to such Merger had Beneficial
Ownership of thirty percent (30%) or more of the then outstanding Voting Securities or Shares, has Beneficial Ownership of thirty percent (30%) or more of the combined voting power of the outstanding voting securities or common stock of
(x) the Surviving Company if there is no Parent Company, or (y) if there is one or more Parent Companies, the ultimate Parent Company. 
 (ii) A complete liquidation or dissolution of the Company; or 
 (iii) The sale or
other disposition of all or substantially all of the assets of the Company to any Person (other than a transfer to a Related Entity or under conditions that would constitute a Non-Control Transaction with the disposition of assets being regarded as
a Merger for this purpose or the distribution to the Company’s stockholders of the stock of a Related Entity or any other assets). 
 Notwithstanding the foregoing: 
 (I) a Change in Control shall not
be deemed to occur solely because any Person (the “Subject Person”) acquired Beneficial Ownership of more than the permitted amount of the then outstanding Shares or Voting Securities if: (1) such acquisition occurs as a result of the
acquisition of Shares or Voting Securities by the Company which, by reducing the number of Shares or Voting Securities then outstanding, increases the proportional number of shares Beneficially Owned by the Subject Person, provided that if a Change
in Control would occur (but for the operation of this subparagraph) as a result of the acquisition of Shares or Voting Securities by the Company, and after such share acquisition by the Company, the Subject Person becomes the Beneficial Owner of any
additional Shares or Voting Securities which increases the percentage of the then outstanding Shares or Voting Securities Beneficially Owned by the Subject Person, then a Change in Control shall occur, or (2) (a) within five business days
after a Change in Control would have occurred (but for the operation of this subparagraph), or if the Subject Person acquired Beneficial Ownership of twenty percent (20%) or more of the then outstanding Shares or the combined voting power of
the Company’s then outstanding Voting Securities inadvertently, then after the Subject Person discovers or is notified by the Company 

  
 - 4 -

 
that such acquisition would have triggered a Change in Control (but for the operation of this subparagraph), the Subject Person notifies the Board of Directors that it did so inadvertently, and
(b) within two business days after such notification, the Subject Person divests itself of a sufficient number of Shares or Voting Securities so that the Subject Person is the Beneficial Owner of less than twenty percent (20%) of the then
outstanding Shares or the combined voting power of the Company’s then outstanding Voting Securities. 

(II) A Change in Control shall not occur upon the Separation. 

For purposes of the foregoing definition of Change in Control, “Company” shall mean (i) prior to the effective date of the
Separation, ONEOK and (ii) on or after the effective date of the Separation, ONE Gas. 
  

	 	E.	“Code” shall mean the Internal Revenue Code of 1986, as amended. 

 

	 	F.	“Committee” shall mean the Executive Compensation Committee of the Board of Directors or such other Committee appointed to manage and administer the
Plan and individual Plan Agreements in accordance with the provisions of Article XIII hereof. 

  

	 	G.	“Company” shall mean ONE Gas, Inc., an Oklahoma corporation, or any division or subsidiary thereof except that for purposes of the Change in Control
definition above, “Company” shall have the meaning provided therein. 

  

	 	H.	“Compensation” shall mean the Base and Short-Term Incentive Cash Compensation from ONEOK paid to or deferred by a Participant during a calendar year.

  

	 	I.	“Death Benefit” shall mean the amount paid to a Participant’s Beneficiary in accordance with the provisions of Article III hereof.

  

	 	J.	“Disability Benefit” shall mean the amount paid to a Participant’s Beneficiary in accordance with the provisions of Section 4.2 hereof.

  

	 	K.	“ERISA” shall mean the Employee Retirement Income Security Act of 1974, as amended. 

 

	 	L.	 “Employee” shall mean any person who is in the regular full-time employment of the Company or any member of the ONE Gas Group or is on
authorized leave of absence therefrom, as determined by the personnel 

  
 - 5 -

	 	
rules and practices of the Company. The term does not include (1) persons who are retained by the Company solely as consultants or under contract or (2) any employee of any member of
the ONEOK Group. 

  

	 	M.	“Former ONE Gas Employee” means any individual (or any beneficiary, dependent, or alternate payee of such individual, as the context requires) whose
employment with any member of the ONEOK Group was terminated prior to January 1, 2014, if such individual was allocated in connection with the Separation to any member of the ONE Gas Group as of January 1, 2014 by ONEOK in its sole
discretion. 

  

	 	N.	“Frozen Final Average Earnings” shall mean the highest thirty-six (36) consecutive months average Compensation (or average of all months of
Compensation if employed less than thirty-six (36) months) of the last sixty (60) months of Service ending on or before December 31, 2004, as provided in Section 4.1.A.(l). 

 

	 	O.	“ONE Gas Employee” means an active employee or an employee on vacation or on approved leave of absence (including sick leave, qualified military
service under the Uniformed Services Employment and Reemployment Rights Act of 1994, as amended, and leave under the Family Medical Leave Act, as amended), in either case, of any member of the ONE Gas Group on or after January 1, 2014, and
shall include any beneficiary, dependent, or alternate payee of such employee, as the context requires. 

  

	 	P.	“ONE Gas” shall mean ONE Gas, Inc., an Oklahoma corporation, or any division or subsidiary thereof. 

 

	 	Q.	“ONE Gas Group” means ONE Gas and each subsidiary of ONE Gas as of January 1, 2014 and any ONE Gas subsidiary that is established or acquired
after January 1, 2014. 

  

	 	R.	“ONE Gas SERP” shall mean the separate ONE Gas, Inc. Supplemental Executive Retirement Plan established by the Company in connection with the
Separation. 

  

	 	S.	“ONEOK” shall mean ONEOK, Inc., an Oklahoma corporation, or any division or subsidiary thereof. 

 

	 	T.	“ONEOK 2005 SERP” shall mean the ONEOK, Inc. 2005 Supplemental Executive Retirement Plan. 

 

	 	U.	“ONEOK Frozen SERP” shall mean the ONEOK, Inc. Supplemental Executive Retirement Plan, which was frozen pursuant to the terms thereof effective
December 31, 2004. 

  
 - 6 -

	 	V.	“ONEOK Group” means (i) prior to January 1, 2014, ONEOK and any of its direct or indirect subsidiaries, and (ii) on and after
January 1, 2014, ONEOK and its subsidiaries as of January 1, 2014 (other than any member of the ONE Gas Group) and any ONEOK subsidiary (other than any member of the ONE Gas Group) that is established or acquired after January 1,
2014. 

  

	 	W.	“Participant” shall have the same meaning as Transferred Participant. 

 

	 	X.	“Plan Agreement” shall mean a written agreement which was entered into by and between ONEOK and a Participant pursuant to the terms of the ONEOK Frozen
SERP, which shall apply to the same effect under this Plan as if entered into by and between the Company and the Participant. 

  

	 	Y.	“Plan” shall mean the ONE Gas, Inc. Pre-2005 Supplemental Executive Retirement Plan as embodied herein and as amended from time to time.

  

	 	Z.	“Rabbi Trust” shall mean the trust created to hold assets which will be used to pay the benefits provided hereunder, as provided in Section 7.4
hereof. 

  

	 	AA.	“Retirement” and “Retire” shall mean (i) prior to the effective date of the Separation, termination of employment with all
members of the ONE Gas Group and the OKE Group, other than as the result of death or Total and Permanent Disability; and (ii) after the effective date of the Separation, termination of employment with all members of the ONE Gas Group, other
than as the result of death or Total and Permanent Disability. 

  

	 	BB.	“Retirement Age” shall mean the retirement age of a Participant specified in the Participant’s Plan Agreement and the Plan.

  

	 	CC.	“Retirement Benefit” shall mean the monthly amount to be paid to a Participant under Sections 4.1, 4.2, or 4.3 hereof, and the Participant’s Plan
Agreement. 

  

	 	DD.	“Retirement Plan” shall mean the ONE Gas, Inc. Retirement Plan. 

 

	 	EE.	“Retirement Plan Benefit” shall mean the benefit or benefits to which a Participant is entitled under the Retirement Plan. 

 

	 	FF.	“Separation” means the separation of ONEOK’s local natural gas distribution business into an independent, publicly traded entity to be known as
ONE Gas. 

  

	 	GG.	“Service” shall mean employment of a Participant by the Company as a regular full-time employee. 

  
 - 7 -

	 	HH.	“Short-Term Incentive Cash Compensation” shall mean any payment by ONEOK under the Key Employee Incentive Plan for Employees of ONEOK, Inc. and
Subsidiaries or any other incentive or commission plan established by ONEOK to pay employees additional cash compensation to reward performance. Provided, that any payment or distribution made to any Participant pursuant to the ONEOK Energy
Marketing & Trading Group Bonus Plan shall be excluded from, and not be considered as Short-Term Incentive Cash Compensation nor otherwise as part of the Compensation of a Participant under and for purposes of this Plan.

  

	 	II.	“Totally and Permanently Disabled” means when, on the basis of medical evidence, it is determined that a Participant: 

 

	 	(a)	is totally disabled so as to be prevented from any comparable employment with the Company, including a disability resulting from an occupational cause; and

  

	 	(b)	will be disabled permanently. 

  

	 	JJ.	“Transferred Participant” shall mean a ONE Gas Employee or Former ONE Gas Employee who was a participant in the ONEOK Frozen SERP immediately before
January 1, 2014. 

  

	 	KK.	“Years of Service” shall include each full year, but not any portion of a year, during which the Participant has been employed by the Company or any
division or subsidiary thereof. 

  

	1.2	Construction. The singular when used herein may include the plural unless the context clearly indicates to the contrary. The words “hereof”,
“herein”, “hereunder”, and other similar compounds of the word “here” shall mean and refer to the entire Plan and not to any particular provision or section. Whenever the words “Article” or “Section”
are used in the Plan, or a cross reference to an “Article” or “Section” is made, the Article or Section referred to shall be an Article or Section of the Plan unless otherwise specified. 

The Plan is intended to be an unfunded deferred compensation and excess benefit plan established and maintained for a select group of
management and highly compensated employees of the Company within the meaning of Sections 201(2) and (7), 301(a)(3), (9) and 401(a)(1) of ERISA, and shall be construed, interpreted and administered in accordance with such intended purpose.

 ARTICLE II. 
 ELIGIBILITY AND PLAN AGREEMENTS 
  

	2.1	Eligibility. No person other than a Transferred Participant shall participate in the Plan or be entitled to rights and benefits provided under the terms of the
Plan. Schedule B sets forth the Transferred Participants as of the effective date of the Plan. 

  
 - 8 -

	2.2	Plan Agreements. The Plan Agreement shall state and provide certain specific terms and provisions that govern the benefits and rights of such Participant from
participation in the Plan. Except as otherwise expressly provided in this Plan document or in the Plan Agreement of a Participant, the specific terms and provisions of a Participant’s Plan Agreement shall take precedence and shall control as to
the amount and form of benefits such Participant is to receive under the Plan and such Plan Agreement. The Plan Agreement of each Participant shall be a part of the Plan as to such Participant for all purposes. A Participant shall not derive any
right or entitlement, directly or indirectly, from the existence of, or provisions in the Plan Agreement of any other Participant in the Plan. 

 ARTICLE III. 
 DEATH BENEFIT 

 

	3.1	Amount and Payment of Death Benefit. In the event a Participant dies prior to Retirement from the Company, the Company will pay or cause to be paid a Death
Benefit to such Participant’s Beneficiary in the amount or amounts set forth in such Participant’s Plan Agreement and as therein specified, commencing on the first day of the month following the date of such Participant’s death, or as
otherwise specified in such Participant’s Plan Agreement. 

  

	3.2	Partial Distribution Prior to Death. If a Participant shall die after becoming entitled to a Retirement Benefit, but before the total amount payable to such
Participant as a Retirement Benefit has been paid, the Retirement Benefit payments then remaining unpaid to such Participant shall be paid to such Participant’s Beneficiary, in accordance with the payment schedule pursuant to which payments are
made under the Participant’s Plan Agreement as provided in Sections 4.1, 4.2, or 4.3 hereof. 

 ARTICLE IV.

 RETIREMENT BENEFIT 
  

	4.1	Retirement. Subject to Sections 4.1.C. and 4.6, below, if a Participant remains an Employee until attaining the Retirement Age stated in such Participant’s
Plan Agreement and shall then retire, the Company shall pay or cause to be paid to such Participant as a Retirement Benefit, the amount or amounts, and at such time or times as is specified in the Participant’s Plan Agreement.

 If a Participant’s Plan Agreement does not state or specify a different amount, form and time of payment of
a Participant’s Retirement Benefit, then the Participant shall be entitled to receive a Retirement Benefit in accordance with Section 4.1.A and Section 4.1.B, below. 

 

	 	A.	 (1) Retirement Benefit. Subject to subparagraph A.(2), below, and the vesting schedule applicable under Section 4.3 and Section 4.6,
below, a monthly amount which, when combined with existing pension benefits payable to the Participant under the Retirement Plan and any retirement plans (other than 401(k) plans) of any of the Participant’s former

  
 - 9 -

	 	
employers, will provide the percentage of the highest thirty-six (36) consecutive months average Compensation (or average of all months of Compensation if employed less than thirty-six
(36) months) of the last sixty (60) months of Service ending on or before December 31, 2004 (“Frozen Final Average Earnings”), for life (15 years minimum) as illustrated below. 

 

					
	 Retirement Age
	  	Retirement Benefit
Percentage	 
	 50 & under
	  	 	50.00	% 
	 51
	  	 	51.20	% 
	 52
	  	 	52.40	% 
	 53
	  	 	53.60	% 
	 54
	  	 	54.80	% 
	 55
	  	 	56.00	% 
	 56
	  	 	56.57	% 
	 57
	  	 	57.14	% 
	 58
	  	 	57.71	% 
	 59
	  	 	58.28	% 
	 60
	  	 	58.85	% 
	 61
	  	 	59.42	% 
	 62
	  	 	60.00	% 
	 63
	  	 	60.56	% 
	 64
	  	 	61.13	% 
	 65 & over
	  	 	61.70	% 

 The Retirement Benefit payment shall commence on the first day of the month following the
Participant’s Retirement. Provided, however, Retirement Benefit payments shall not commence until the later of (i) the Participant attaining the age of fifty (50), and (ii) the commencement of retirement benefit payments to the
Participant under the Retirement Plan. 

  
 - 10 -

	 	(2)	Adjustment of Retirement Benefit Payments; Early Commencement. The amount of a Participant’s Retirement Benefit payments will be reduced by reason of early
retirement and commencement of payment thereof, based on the following table depending upon the Participant’s age when Retirement Benefit payments to the Participant commence: 

 

					
	 Age At Commencement of Retirement Benefit Payments
	  	Payout Percentage Factor
Of Retirement Benefit
Percentage	 
	 50
	  	 	50	% 
	 51
	  	 	55	% 
	 52
	  	 	60	% 
	 53
	  	 	65	% 
	 54
	  	 	70	% 
	 55
	  	 	75	% 
	 56
	  	 	80	% 
	 57
	  	 	85	% 
	 58
	  	 	90	% 
	 59
	  	 	95	% 
	 60 & older
	  	 	100	% 

  

	 	B.	Code Sections 401(a)(17) and 415(b) Limitations. Notwithstanding Section 4.1.A., above, the Plan shall provide an excess Retirement Benefit attributable to
a Participant’s annual eligible compensation under the Retirement Plan that is an amount equal to the difference between (i) the Retirement Plan Benefit to which the Participant would be entitled under the Retirement Plan if such
Retirement Plan Benefit was computed without the restrictions and limitations imposed by Section 401(a)(17) and 415(b) of the Code as now or hereafter in effect, and (ii) the amount of the Retirement Plan Benefit payable to the Participant
under the Retirement Plan. This part of the Retirement Benefit will be computed by applying the same benefit formula, vesting provisions, and early retirement provisions as are in and applied pursuant to the Retirement Plan. Any part of the
Retirement Benefit provided under this Section 4.1.B. will offset and reduce that part of the Retirement Benefit provided under Section 4.1.A., above. Provided, that if a Participant in this Plan is entitled to an Excess Retirement Benefit
under the ONE Gas SERP at his/her Retirement, then the Excess Retirement Benefit under the ONE Gas SERP shall be paid to such Participant in accordance with the provisions of Part A of the ONE Gas SERP and in lieu of the part of his/her Retirement
Benefit provided for under this Section 4.1.B, and such Excess Retirement Benefit under the ONE Gas SERP will offset and reduce that part of the Retirement Benefit provided in Section 4.1.A., above. 

 

	 	C.	Retirement Benefit. The amount of the Retirement Plan Benefit of a Participant taken into account under Section 4.1.A. and Section 4.1.B. shall be the
amount of such Retirement Benefit at the time of commencement of payment of the Retirement Plan Benefit to such Participant under this Plan, notwithstanding that such Retirement Plan Benefit is finally determined after December 31, 2004, and
that Frozen Final Average Earnings, and frozen vesting under Section 4.3., are applied to such Retirement Benefit, as herein provided. 

  
 - 11 -

	4.2	Disability. If a Participant shall become Totally and Permanently Disabled prior to Retirement and such total disability continues for more than six
(6) months, such Participant shall be entitled to receive a Disability Benefit in the amount set forth in the Participant’s Plan Agreement. 

  

	4.3	Vesting of Retirement Benefit. A Participant’s Retirement Benefit shall unconditionally vest in such Participant and become nonforfeitable according to the
vesting schedule stated in the Participant’s Plan Agreement. Notwithstanding anything to the contrary expressed or implied in the Plan, or in a Participant’s Plan Agreement that states the terms governing vesting and nonforfeitability of
such Participant’s Retirement Benefit under the Plan, no Service or Years of Service of the Participant with ONEOK or the Company after December 31, 2004, shall be considered or used in determining the vesting and nonforfeitability of such
Participant’s Retirement Benefit under the Plan. If a Participant’s Plan Agreement does not state or specify the terms governing vesting and nonforfeitability of such Participant’s Retirement Benefit, then the Participant’s
Retirement Benefit shall vest and become nonforfeitable as follows: 

  

					
	 Years of Service with the Company
	  	Vested Percentage of
Retirement Benefit	 
	 0 to 5
	  	 	0	% 
	 6
	  	 	10	% 
	 7
	  	 	20	% 
	 8
	  	 	30	% 
	 9
	  	 	40	% 
	 10
	  	 	50	% 
	 11
	  	 	60	% 
	 12
	  	 	70	% 
	 13
	  	 	80	% 
	 14
	  	 	90	% 
	 15 or more
	  	 	100	% 

 If a Participant attains age sixty-five (65) prior to his/her Retirement, and prior to
January 1, 2005, then such Participant shall be 100% vested regardless of the above schedule. A Participant first attaining age sixty-five (65) after December 31, 2004, shall not result in 100% vesting nor otherwise change the vesting
and nonforfeitability of the Participant’s Retirement Benefit under the Plan. Retirement Benefits hereunder offsetting the limitations of Internal Revenue Code Sections 401(a)(17) and 415(b) shall be immediately fully vested for all purposes.

  

	4.4	Forfeitability of Retirement Benefit. Notwithstanding any provision to the contrary expressed or implied herein, a Participant’s right to receive a
Retirement Benefit under the Plan and such Participant’s Plan Agreement shall be forfeitable to the extent that such Retirement Benefit has not vested as described in Section 4.3 and the Participant’s Plan Agreement.

  
 - 12 -

	4.5	Retirement Benefit Payment Election. In lieu of payment of the Retirement Benefit to a Participant as otherwise provided herein and in the Participant’s
Plan Agreement, a Participant may make a written request to the Company prior to the time for commencement of payment of such Retirement Benefit by the Company to receive payment of the present value of such Participant’s Retirement Benefit in
a single lump sum amount, less six percent (6%) of the amount thereof as a substantial penalty, which penalty will be forfeited by the Participant. The Company may, in its sole discretion, grant or deny such request. If such request is granted
the payment of such lump sum amount shall be made by the Company, and thereafter the Company shall have no further obligation to the Participant. The present value of a Participant’s Retirement Benefit shall be determined in accordance in the
manner prescribed under the provisions at Section 417(e)(3) of the Code and Treasury regulations thereunder with respect to benefits payable under a qualified pension or profit sharing plan. A beneficiary of a deceased Participant, or a duly
appointed guardian of an incompetent or incapacitated Participant may also request payment of the Participant’s Retirement Benefit in a lump sum under this Section 4.5. 

 

	4.6	ONE Gas SERP Part B Supplemental Retirement Benefit Offset; Waiver and Forfeiture of Plan Retirement Benefit. Notwithstanding anything to the contrary expressed
or implied in the Plan or in any Plan Agreement, if a Participant in the Plan elected to receive and/or by reason of his/her election does receive any part or payment of a Supplemental Retirement Benefit to which he/she is entitled under Part B of
the ONE Gas SERP, then that Supplemental Retirement Benefit shall be paid in lieu of the Participant’s Retirement Benefit under Section 4.1.A. of this Plan; and the Participant shall, by such election, be deemed to voluntarily and
completely waive, disclaim and forfeit all his/her right and entitlement to receive, and he/she shall not receive, any amount or payment of that part of his/her Retirement Benefit under Section 4.1.A of this Plan. 

ARTICLE V. 

BENEFICIARY 
 A
Participant shall designate a Beneficiary to receive benefits under the Plan and the Participant’s Plan Agreement by completing the appropriate space in such Plan Agreement. If more than one Beneficiary is named, the shares and/or precedence of
each Beneficiary shall be indicated. As a condition to any married Participant designating a Beneficiary other than such Participant’s spouse, the Committee may require the spouse’s consent. A Participant shall have the right to change the
Beneficiary by submitting to the Committee a Change of Beneficiary in the form attached as Appendix I hereof; provided, however, that no change of Beneficiary shall be effective until acknowledged in writing by the Committee. If the
Company has any doubt as to the proper Beneficiary to receive payments hereunder, the Company shall have the right to withhold such payments until the matter is finally adjudicated. Any payment made or caused to be made by the Company in good faith
and in accordance with the provisions of the Plan and a Participant’s Plan Agreement shall fully discharge the Company from all further obligations with respect to such payment. 

  
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 ARTICLE VI. 
 LEAVE OF ABSENCE 
 If a Participant is authorized by the Company for any reason,
including military, medical, or other, to take a leave of absence from employment, such Participant’s Plan Agreement shall remain in effect. 
 ARTICLE VII. 
 SOURCE OF BENEFITS 

 

	7.1	Benefits Payable. Retirement Benefits and any other amounts payable hereunder shall be paid exclusively from the general assets of the Company or the
Rabbi Trust to be established pursuant to Section 7.4; provided, that no person entitled to payment hereunder shall have any claim, right, security interest, or other interest in any fund, trust, account, insurance contract, or asset of the
Company which may be looked to for such payment. The Company’s liability for the payment of benefits hereunder shall be evidenced only by the Plan and each Plan Agreement. 

 

	7.2	Investments to Facilitate Payment of Benefits. Although the Company is not obligated to invest in any specific asset or fund, or purchase any insurance
contract, in order to provide the means for the payment of any Retirement Benefits under the Plan, the Company may elect to do so, and, in such event, no Participant shall have any interest whatever in such asset, fund, or insurance contract. In the
event the Company elects to purchase or causes to be purchased insurance contracts on the life of a Participant as a means for making, offsetting, or contributing to any payment, in full or in part, which may become due and payable by the Company
under the Plan or a Participant’s Plan Agreement, such Participant agrees to cooperate in the securing of life insurance on such Participant’s life by furnishing such information as the Company and the insurance carrier may require,
including the results and reports of previous Company and other insurance carrier physical examinations as may be requested, and taking any other action which may be requested by the Company and the insurance carrier to obtain such insurance
coverage. If a Participant does not cooperate in the securing of such life insurance, the Company shall have no further obligation to such Participant under the Plan, and such Participant’s Plan Agreement shall terminate.

  

	7.3	Ownership of Insurance Contracts. The Company shall be the sole owner of any insurance contracts acquired on the life of a Participant with all incidents
of ownership therein, including, but not limited to, the right to cash and loan values, dividends, if any, death benefits, and the right to termination thereof, and a Participant shall have no interest whatsoever in such contracts, if any, and shall
exercise none of the incidents of ownership thereof. Provided, however, the Company may assign any such insurance contracts to the trustee of the Rabbi Trust. 

 

	7.4	Trust for Payment of Retirement Benefits. The Company shall create a Rabbi Trust for the purpose of facilitating any retirement benefits payable
hereunder. Such trust will be funded to provide the applicable vested Retirement Benefits payable under the Plan and Plan Agreements upon the occurrence of any of the following events: 

 

	 	(a)	At the Retirement of, and commencement of payment of Retirement Benefits to a Plan Participant; 

  
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	 	(b)	Upon a decision by the Committee, or by the Board of Directors; or 

  

	 	(c)	Upon a Change in Control. 

 Such
funding may be in the form of single premium annuities, or an amount sufficient for the trustee to purchase single premium annuities, or life insurance policies or contracts insuring the lives of Plan Participants, from qualified and financially
sound insurance companies, and such other forms or types of investments the Company may select from time to time to provide the applicable vested Retirement Benefits payable under the Plan and Plan Agreements. Such funding and the purchase of
insurance, if any, will not relieve the Company of its obligations to pay or cause to be paid the benefits hereunder. 
 The
Rabbi Trust may be maintained and administered to also provide for the funding of payment of amounts payable to participants in other deferred compensation and benefit plans of the Company. The funding, investments and administration of the Rabbi
Trust in connection with such other separate plan or plans shall be separately administered and accounted for as determined to be necessary and appropriate by the Company and trustee pursuant to the terms of the Rabbi Trust. It shall be permissible
for the trustee to invest funds of the Rabbi Trust in one or more forms of investment that is common to plans being funded thereunder. 
 The Rabbi Trust shall be a grantor trust of which the Company is the grantor within the meaning of the Code. The principal of the Rabbi Trust and any earnings thereon shall be held separate and apart from
other funds of the Company and shall be used exclusively for the uses and purposes of Participants in the Plan and general creditors of the Company as specified hereinbelow and in the trust instrument. Participants in the Plan and their
Beneficiaries shall have no preferred claim on, or any beneficial ownership in any assets of the Rabbi Trust; and any rights created under the Plan or Participant Plan Agreements, and the Rabbi Trust are to be made unsecured contractual rights of
Participants and their Beneficiaries against the Company; and assets held by the Rabbi Trust will be subject to the claims of the Company’s general creditors under federal and state law in the event of insolvency of the Company. 

ARTICLE VIII. 

TERMINATION OF EMPLOYMENT 
 Neither the Plan nor a Participant’s Plan Agreement, either singly or collectively, in any way obligate the Company, or any subsidiary of the Company, to continue the employment of a Participant with
the Company, or any subsidiary of the Company, nor does either limit the right of the Company or any subsidiary of the Company at any time and for any reason to terminate the Participant’s employment. Termination of a Participant’s
employment with the Company, or any subsidiary of the Company, for any reason, whether by action of the Company, subsidiary, or Participant, shall immediately terminate the Participant’s participation in the Plan and such Participant’s
Plan Agreement, and all further obligations of either party thereunder, except as 

  
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may be provided in Article X and the Participant’s Plan Agreement. In no event shall the Plan or a Plan Agreement, either singly or collectively, by their terms or implications constitute an
employment contract of any nature whatsoever between the Company, or any subsidiary, and a Participant. 
 ARTICLE IX.

 TERMINATION OF PARTICIPATION 
 A Participant reserves the right to terminate participation in the Plan and such Participant’s Plan Agreement at any time by giving the Company written notice of such termination not less than 30
days (i) prior to the anniversary date of any contract or contracts of insurance on the life of such Participant which may be in force and utilized by the Company in connection with the Plan, or (ii) prior to the date a Participant selects
for termination if no insurance contract is in effect. 
 ARTICLE X. 

TERMINATION, AMENDMENT, MODIFICATION, 
 OR SUPPLEMENT OF THE PLAN 
  

	10.1	Amendment or Termination. Subject to Sections 10.2 and 10.3, below, the Company reserves the right to amend, modify, supplement, or terminate the Plan, wholly or
partially, from time to time, and at any time. The Company likewise reserves the right to amend, modify, or supplement any Plan Agreement, wholly or partially, from time to time. Such right to amend, modify, supplement, or terminate the Plan or any
Plan Agreement, as the case may be, shall be exercised for the Company by the Board of Directors; provided, that the Committee shall also be authorized to amend or modify the terms and provisions of the Plan, or a Plan Agreement thereunder, except
that any amendment or modification of the Plan or a Plan Agreement that changes the amount of any payment or benefit to a Participant that is provided for under the Plan or Plan Agreement shall be made only with the approval and by action of the
Board of Directors; provided further in the event of a Change in Control of the Company, for a period of two (2) years after the date of such Change of Control the surviving corporation may terminate or amend the Plan only by
substitution by such corporation of another plan or program, or by amendments to the Plan, which provide benefits no less favorable to the Participants of this Plan; and upon the expiration of such two (2) year period such surviving corporation
may thereafter terminate or amend the Plan or any such substituted plan subject in any case to Section 10.2, below. 

  

	10.2	Rights and Obligations Upon Amendment, Termination. The following terms and conditions shall govern the rights and obligations of a Participant and the Company
(including any surviving corporation in event of a Change of Control), respectively, with respect to the amendment or termination of the Plan. 

  

	 	A.	 Notwithstanding anything to the contrary expressed or provided in the Plan or any Plan Agreement of a Participant, no amendment, modification or
termination of the Plan, shall decrease a Participant’s accrued Retirement Benefit. For purposes of this Paragraph A., a Plan amendment 

  
 - 16 -

	 	
which has the effect of decreasing a Participant’s accrued Retirement Benefit or eliminating an optional form of payment of a Participant’s accrued Retirement Benefit, with respect to
benefits attributable to service before the amendment shall be treated as reducing an accrued Retirement Benefit. If a vesting schedule under the Plan or any Plan Agreement is amended, the Participant’s non-forfeitable percentage, determined as
of the later of the date such amendment is adopted or the date it becomes effective, will not be less than the percentage computed under the Plan and Plan Agreement without regard to such amendment. 

 

	 	B.	Except as provided in paragraph A of this Section 10.2, upon the termination of the Plan by the Board of Directors, or a termination of the Plan Agreement of a
Participant, in accordance with the provisions for such termination, neither the Plan nor the Plan Agreement shall be of any further force or effect, and no party shall have any further obligation under either the Plan or any Plan Agreement so
terminated, except as provided in the Plan or Plan Agreement with respect to accrued benefits at the time of such termination or as elsewhere provided in the Plan. 

 

	 	C.	For purposes of paragraphs A and B of this Section 10.2, the term “Plan” shall also mean and include any substituted plan that may be established in
event of a Change of Control as described in Section 10.1, above, and the term “Retirement Benefit” shall also mean and include any benefit provided for under such a substituted plan. 

ARTICLE XI. 

TREATMENT OF BENEFITS 
 Retirement Benefits under the Plan and Plan Agreements entered into hereunder shall not be considered compensation for the purpose of computing contributions or benefits under any plan maintained by the
Company, or any of its subsidiaries, which is qualified under Section 401(a) of the Code. 
 ARTICLE XII. 

RESTRICTIONS ON ALIENATION OF BENEFITS 
 No Retirement Benefit, or other right or benefit under the Plan or a Plan Agreement shall be subject to anticipation, alienation, sale, assignment, pledge, encumbrance, or charge, and any attempt to
anticipate, alienate, sell, assign, pledge, encumber, or charge the same shall be void. No Retirement Benefit, or right or benefit under the Plan or under any Plan Agreement shall in any manner be liable for or subject to the debts, contracts,
liabilities, or torts of the person entitled to such thereto. If any Participant or Beneficiary under the Plan or a Plan Agreement should become bankrupt or attempt to anticipate, alienate, sell, assign, pledge, encumber, or charge any right to a
benefit under the Plan or under any Plan Agreement, then such right or benefit shall, in the discretion of the Committee, cease, and in such event, the Committee may hold or apply the same or any part thereof for the benefit of such Participant or
Beneficiary, his or her spouse, children, or other dependents, or any of them, in such portion as the Committee, in its sole and absolute discretion, may deem proper. 

  
 - 17 -

 ARTICLE XIII. 
 ADMINISTRATION OF THE PLAN 
  

	13.1	Appointment of Committee. The general administration of the Plan, and any Plan Agreements executed hereunder, as well as construction and interpretation thereof,
shall be vested in the Committee, the number and members of which shall be designated and appointed from time to time by, and shall serve at the pleasure of, the Board of Directors. Any such member of the Committee may resign by notice in writing
filed with the Board of Directors. Vacancies shall be filled promptly by the Board of Directors. The Committee may, at its discretion, delegate discretionary authority for day-to-day administration of the Plan to the Company’s Benefit Plan
Administration Committee or its authorized representatives pursuant to a duly adopted resolution or a memorandum of action signed by all members of the Committee or approved via electronic transmission. All actions taken by the Company’s
Benefit Plan Administration Committee or its authorized representative shall have the same legal effect and shall be entitled to the same deference as if taken by the Committee itself. 

 

	13.2	Committee Officials. The Board of Directors may designate one of the members of the Committee as Chairman and may appoint a secretary who need not be a member of
the Committee. The secretary shall keep minutes of the Committee’s proceedings and all data, records, and documents relating to the Committee’s administration of the Plan and any Plan Agreements executed hereunder. The Committee may
appoint from its number such subcommittees with such powers as the Committee shall determine and may authorize one or more of its members or any agent to execute or deliver any instrument or make any payment on behalf of the Committee.

  

	13.3	Committee Action. All resolutions or other actions taken by the Committee shall be by the vote of a majority of those present at a meeting at which a majority of
the members are present, or in writing by all the members at the time in office if they act without a meeting. 

  

	13.4	Committee Rules and Powers - General. Subject to the provisions of the Plan, the Committee may from time to time
establish rules, forms, and procedures for the administration of the Plan, including Plan Agreements. Except as herein otherwise expressly provided, the Committee shall have the exclusive right to interpret the Plan and any Plan Agreements, and to
decide any and all matters arising thereunder or in connection with the administration of the Plan and any Plan Agreements, and it shall endeavor to act, whether by general rules or by particular decisions, so as not to discriminate in favor of or
against any person. The Committee shall have the exclusive right to determine if a Participant has become Totally and Permanently Disabled with respect to a Participant (consistent with the Plan’s definition of the term), such determinations to
be made on the basis of such medical and/or other evidence that the Committee, in its sole and absolute discretion, may require. Such decisions, actions, and records of the Committee shall be conclusive and binding upon the Company, the
Participants, and all persons having or claiming to have rights or interests in or under the Plan. 

  
 - 18 -

	13.5	Reliance on Certificates, etc. The members of the Committee and the Officers and Directors of the Company shall be entitled to rely on all certificates and
reports made by any duly appointed accountants, and on all opinions given by any duly appointed legal counsel. Such legal counsel may be counsel for the Company. 

 

	13.6	Liability of Committee. No member of the Committee shall be liable for any act or omission of any other member of the Committee, or for any act or omission on
his part, excepting only his own willful misconduct. The Company shall indemnify and save harmless each member of the Committee against any and all expenses and liabilities arising out of membership on the Committee, excepting only expenses and
liabilities arising out of a Committee member’s own willful misconduct. Expenses against which a member of the Committee shall be indemnified hereunder shall include, without limitation, the amount of any settlement or judgment, costs, counsel
fees, and related charges reasonably incurred in connection with a claim asserted, or a proceeding brought, or settlement thereof. The foregoing right of indemnification shall be in addition to any other rights to which any such member may be
entitled. 

  

	13.7	Determination of Benefits. In addition to the powers hereinabove specified, the Committee shall have the power to compute and certify, under the Plan and any
Plan Agreement, the amount and kind of benefits from time to time payable to Participants and their Beneficiaries, and to authorize all disbursements for such purposes. 

 

	13.8	Information to Committee. To enable the Committee to perform its functions, the Company shall supply full and timely information to the Committee on all matters
relating to the compensation of all Participants, their retirement, death, or other cause for termination of employment, and such other pertinent facts as the Committee may require. 

 

	13.9	Manner and Time of Payment of Benefits. The Company shall have the power, in its sole and absolute discretion, to change the manner and time of payment of future
Retirement Benefits to be made to a Participant or the Participant’s Beneficiary from that set forth in the Participant’s Plan Agreement, if requested to do so by such Participant or Beneficiary. Any request by a Participant for such a
change must be made by the Participant in writing more than thirty (30) days in advance of the time such Retirement Benefits would otherwise be paid, unless the Company, in its discretion, allows such a request at a later date that also
precedes the existing time of payment which is the subject of the request. 

 ARTICLE XIV. 

ADOPTION OF PLAN BY SUBSIDIARY, 
 AFFILIATED OR ASSOCIATED COMPANIES 
 Any corporation which is a subsidiary of the
Company may, with the approval of the Board of Directors, adopt the Plan and thereby come within the definition of Company in Article I hereof. 

  
 - 19 -

 ARTICLE XV. 
 EXCESS RETIREMENT BENEFIT PAYMENTS 
 COMMENCED BEFORE SEPTEMBER 1, 1998 

Notwithstanding anything expressed or implied to the contrary herein, the payment of excess retirement benefits to a retired Plan
Participant that commenced under the ONEOK Frozen SERP prior to September 1, 1998, shall be paid in accordance with, and to the extent provided by, the applicable terms and provisions of the ONEOK Frozen SERP in effect prior to
September 1, 1998. 
 ARTICLE XVI. 
 MISCELLANEOUS 
  

	16.1	Execution of Receipts and Releases. Any payment to a Participant, a Participant’s legal representative, or Beneficiary in accordance with the provisions of
the Plan or any Plan Agreement executed hereunder shall, to the extent thereof, be in full satisfaction of all claims hereunder against the Company. The Company may require such Participant, legal representative, or Beneficiary, as a condition
precedent to such payment, to execute a receipt and release therefor in such form as it may determine. 

  

	16.2	No Guarantee of Interests. Neither the Committee nor any of its members guarantees the payment of any amounts which may be or becomes due to any person or entity
under the Plan or any Plan Agreement executed hereunder. The liability of the Company to make any payment under the Plan or any Plan Agreement executed hereunder is limited to the then available assets of the Company and the Rabbi Trust established
under Section 7.4 hereof. 

  

	16.3	Company Records. Records of the Company as to a Participant’s employment, termination of employment and the reason therefor, reemployment, authorized leaves
of absence, and compensation shall be conclusive on all persons and entities, unless determined to be incorrect. 

  

	16.4	Evidence. Evidence required of anyone under the Plan and any Plan Agreement executed hereunder may be by certificate, affidavit, document, or other information
which the person or entity acting on it considers pertinent and reliable, and signed, made, or presented by the proper party or parties. 

  

	16.5	Notice. Any notice which shall be or may be given under the Plan or a Plan Agreement executed hereunder shall be in writing and shall be mailed by United States
mail, postage prepaid. If notice is to be given to the Company, such notice shall be addressed to the Company at: 

 15 East 5th
Street 
 Tulsa, OK 74103 

  
 - 20 -

 and marked to the attention of the Secretary, Supplemental Executive Retirement Plan
Administrative Committee; or, if notice to a Participant, addressed to the address shown on such Participant’s most recent employment file with the Company. 
  

	16.6	Change of Address. Any party may, from time to time, change the address to which notices shall be mailed by giving written notice of such new address.

  

	16.7	Effect of Provisions. The provisions of the Plan and of any Plan Agreement executed hereunder shall be binding upon the Company and its successors and assigns,
and upon a Participant, the Participant’s Beneficiary, assigns, heirs, executors, and administrators. 

  

	16.8	Headings. The titles and headings of Articles and Sections are included for convenience of reference only and are not to be considered in the construction of the
provisions hereof or any Plan Agreement executed hereunder. 

  

	16.9	Governing Law. All questions arising with respect to the Plan and any Plan Agreement executed hereunder shall be determined by reference to the laws of the State
of Oklahoma in effect at the time of their adopting and execution, respectively. 

  

	16.10	Effective Date. The terms of this Plan shall be effective January 1, 2014. 

  
 - 21 -

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