ONE Gas, Inc. Nonqualified Deferred Compensation Plan, as amended and restated effective January 1, 2018

The Plan, established effective January 1, 2014, is amended and restated effective January 1, 2018. This restated plan shall apply only to amounts deferred on or after January 1, 2018. All amounts deferred or credited prior to January 1, 2018 shall be governed by the terms of the Plan adopted effective January 1, 2014.

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.

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.

The Plan is amended and restated effective on January 1, 2018.

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.

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

“401(k) Plan” means the ONE Gas, Inc. 401(k) Plan.

“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.

“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 B attached hereto. The Base Salary does not include any Lump Sum Merit Award paid to a Participant, nor any Bonus, as defined below.

“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” means the Board of Directors of the Corporation.

“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 401(k) Plan.

“Change in Ownership or Control” means 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.

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

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

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

“Corporation” means ONE Gas, Inc., its successors and assigns, or any division or Subsidiary thereof.

“Deferred Compensation” means the Base Salary and Bonus deferred by a Participant under the Plan, and the Matching Contributions, Profit Sharing Plan Excess Amounts, Retirement Plan Covered Compensation 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” 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” 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” 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” 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.

“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” means, as the context requires, (i) the Participant’s election to defer Base Salary and Bonus earned with respect to services performed during a Plan Year, and/or (ii) the Participant’s distribution elections.

“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.

“Employee” means an employee of the Corporation or a Subsidiary.

“Employer” means, with respect to a Participant, the Corporation or the Subsidiary which pays such Participant’s Compensation.

“ERISA” means the Employee Retirement Income Security Act of 1974, as amended.

“Exchange Act” means the Securities Exchange Act of 1934, as amended.

“Fiscal Year” means the fiscal year of the Corporation commencing January 1 and ending the following December 31.

“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.

“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” 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 “C” attached hereto; provided, that no Investment Return shall be credited with respect to the Retirement Plan Excess Amount.

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

“Matching Contribution” means an amount equal to (a) minus (b) below:

(a)the Matching Contribution Percentage multiplied by the Participant’s Compensation; and

(b)the amount of the 401(k) Plan matching contributions made by the Corporation that are allocated to the Participant’s 401(k) Plan account for that Plan Year.

The Matching Contribution cannot exceed the Participant’s deferrals of Compensation under this Plan for the applicable Plan Year.

“Matching Contribution Percentage” means the matching contribution percentage in effect for a specific Plan Year under the 401(k) Plan.

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

“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, 2018, and shall include any beneficiary, dependent, or alternate payee of such employee, as the context requires.

“ONE Gas Group” means ONE Gas and each subsidiary of ONE Gas as of January 1, 2018 and any ONE Gas subsidiary that is established or acquired after January 1, 2018.

“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” means ONEOK, Inc., an Oklahoma corporation.

“ONEOK 2005 NQDC Plan” shall mean the ONEOK, Inc. 2005 Nonqualified Deferred Compensation 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” means any Eligible Employee who elects to participate by filing a Participation Agreement as provided in Section 3.2.

“Participation Agreement” means the agreement filed by a Participant, in the form prescribed by the Committee, pursuant to Section 3.2.

“Person” means an individual, a trust, estate, partnership, limited liability company, association, corporation or other entity.

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

“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” means a twelve-month period commencing January 1 and ending the following December 31.

“Profit Sharing Plan” means the ONE Gas, Inc. Profit Sharing Plan.

“Profit Sharing Plan Excess Amount” means an amount equal to the Participant’s Compensation for the Plan Year that is used for calculating Employer contributions to the Profit Sharing Plan multiplied by the applicable percentage for determining the Employer contributions under the Profit Sharing Plan for the Plan Year, minus the amount of Profit Sharing Plan Employer 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 Employer 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 Employer contributions applicable to Profit Sharing Plan Employer 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 5.3 of the Plan.

“Retirement Plan” means the ONE Gas, Inc. Retirement Plan.

“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 Employer 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 5.4 of the Plan.

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

“Specified Employee Identification Date” means December 31.

“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” 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” 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” 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 Participant.

“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” 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” means a supplemental amount that may be credited to a Participant’s Account at the direction of the Committee under Section 5.5.

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

“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.

“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).

“Years of Service” means each 12-month period of continuous service with the Corporation. Participants shall receive Years of Service credit for all service credited for those purposes under the ONEOK 2005 NQDC Plan as if the service had been rendered to the Corporation.

Eligibility to participate in the Plan shall be granted to 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.

Participation in the Plan shall be limited to Eligible Employees who make an Election to participate in the Plan by timely filing a Participation Agreement with the Committee or receive an Employer contribution to their Account pursuant to Article V of the Plan. 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.

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.

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.

Notwithstanding anything to the contrary expressed or, implied herein, the following requirements stated in this Section 4.3 shall apply to the Plan and to all Elections by Participants under the Plan.

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.

allowed to make another Subsequent Election applicable to such Subsequent Election Specified Time of Distribution in accordance with this Section 4.4 and other provisions of the Plan.

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.

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 Matching Contributions, Profit Sharing Plan Excess Amounts, Retirement Plan Covered Compensation Excess Amounts and Supplemental Credit Amounts, 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.

A Participant shall be entitled to have credited to his/her Account such Supplemental Credit Amounts to the extent provided for in such authorization.

shall be payable at the same Specified Time and in the same form of payment as the Long‑Term Deferrals of and for the Participant for that Plan Year.

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.

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 IV and 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.

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 “D,” and furnished to the Participants in the Plan.

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

To the extent the Investment Return specified in Exhibit “C” 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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

make such calculation does not constitute an event beyond the control of the Participant.

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 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 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.

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.

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.

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.

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.

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.

of the Plan and any such Trust with the trustee being subject to the direction of the Committee.

The Committee may, at its discretion, delegate discretionary authority for day-to-day administration of the Plan to the Corporation’s Benefits 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 Corporation’s Benefits 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.

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.

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.

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.

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.

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.

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

This Plan is intended to comply with Code Section 409A, the Treasury regulations and other guidance promulgated or issued thereunder. The Corporation shall not have any liability to a Participant with respect to tax obligations that result under any tax law and makes no representation with respect to the tax treatment of the payments and/or benefits provided under this Plan. Any provision required for compliance with Section 409A that is omitted from this Plan shall be incorporated herein by reference and shall apply retroactively, if necessary, and be deemed a part of this Plan to the same extent as though expressly set forth herein.

If, and to the extent required to comply with Section 409A, a termination of employment shall not be deemed to have occurred for purposes of any provision of this Plan providing for the payment of any amounts or benefits upon or following a termination of employment unless such termination is also a “separation from service” (excluding death) within the meaning of Section 409A and, for purposes of any such provision of this Plan, references to a “resignation,” “termination,” “termination of employment” or like terms shall mean “separation from service” (excluding death).

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.

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.

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.

Executed this ____ day of _____________, 2017, to be effective January 1, 2018.

ONE GAS, INC.

By:    

Name:        

Title:        

Re:    Section 3.1 - Eligible Employees

Effective Date: January 1, 2018

Except as otherwise specifically determined by the Committee, the Committee has determined that the Chief Executive Officer of the Corporation is and shall in all cases be an Eligible Employee, and other Eligible Employees who may participate in the Plan shall be designated in writing by the Chief Executive Officer, or his designee, each Plan Year during the period after November 1 and prior to the next January 1 (“Designation Period”), with such designation to indicate the Eligible Employees for the Plan Year next following such Designation Period who shall be each Employee who (i) had Base Salary on November 1 of that Plan Year, which places such Employee in the group of Employees consisting of the top two percent (2%) of the Employees when ranked on the basis of Base Salary, (ii) is either an Officer of the Corporation or a highly compensated employee as defined in Code section 414(q), and (iii) is so designated by name in writing in an instrument signed by the Chief Executive Officer of the Corporation, or his designee. The designation of Eligible Employees for a Plan Year shall be reported to the Committee and Board in accordance with their directions.

An Employee must be an Eligible Employee prior to the beginning of a Plan Year in order to participate in the Plan for such Plan Year, unless otherwise determined by the Committee.

A list of the Eligible Employees who are so designated and approved for a Plan Year shall be made by the Chief Executive Officer, or his designee, the Committee, or by a duly authorized representative of the Committee, and be maintained with the Plan in the records of the Corporation.

Re:    Section 4.1 - Amount of Deferral

Effective Date: January 1, 2018

As of the date above, and effective until this Exhibit is modified by the Committee and Board, the table below indicates the types of compensation that are eligible for deferral by and in an Election of a Participant or the Corporation at the designated percentages stated:

A Participant may defer Base Salary or Bonus only in 1% increments thereof.

* The Participant’s deferral election shall be applied to Base Salary and Bonus.

Re:    Section 2.1 - Investment Return

Date: January 1, 2018

The Investment Return on a Participant’s Account shall be the rate determined pursuant to the following:

1.A Participant shall designate in writing to the Committee or its designee such deemed investments of the amount or amounts of his/her Account in the manner and form, and at such times as prescribed by the Committee.

2.Unless otherwise determined in written action of the Committee that is described in a written explanation furnished to Participants prior to it becoming effective, the Plan shall provide for an Investment Return based upon the notional or deemed investments directed from time to time by the Participant in one or more of the investment options then being provided for participant directed investments under the 401(k) Plan and Profit Sharing Plan, excluding ONE Gas common stock. The Committee and its designees shall establish administrative procedures for allowing Participant direction of deemed investment and the determination of the Investment Return thereon.

3.A Participant shall be allowed to change such designation at least once each calendar quarter, or more frequently as determined by the Committee, in its sole discretion. Such Investment Return shall be determined and calculated in the manner determined by the Committee, in its sole discretion, and added to or deducted from the amount or amounts of his/her Account periodically, not less frequently than annually. Such Investment Return Rate shall be so credited to or deducted from the amount or amounts of a Participant’s Account until all payments with respect thereto have been made to the Participant, or to the Participant’s designated Beneficiary pursuant to the Plan. The Employer shall not be liable or otherwise responsible for any decrease in a Participant’s Account because of the investment performance resulting from application of the foregoing provisions.

Notwithstanding the foregoing, the Employer shall not be required to actually invest amounts deferred by a Participant nor the Account of any Participant in any particular form, type or amount of investment, and no Participant shall have the right to direct or in any manner control the actual investments, if any, made by the Employer or any other person for purposes of providing funds for paying the liabilities of the Employer for benefits or otherwise under the Plan; and a Participant shall not have any ownership or beneficial interest in any such actual investments that may be made by the Employer. In no event shall any Participant or Beneficiary have a right to receive an amount under the Plan other than that of a general unsecured creditor of the Employer notwithstanding the foregoing provisions with respect to the measurement and determination of a Participant’s Investment Return in his or her Account by reference to the performance of deemed investments in the 401(k) Plan or Profit Sharing Plan investment options designated by the Participant.

4.A Participant shall be entitled to elect to have the Investment Return credited to and deducted from his or her Accounts under the Plan. A Participant shall make an Election of such Investment Return at the time and in the manner prescribed by the Committee.

Re:    Section 6.2 - Crediting and Debiting of Investment Return,

Other Items To Participant Accounts

Date: January 1, 2018