Document:

EX-4.7

 Exhibit 4.7 

AMENDMENT NO. 6 TO 

ONEOK, INC. 401(K) PLAN 
 (As
amended and restated effective January 1, 2014) 
 1.    Effective January 1, 2017, a new paragraph is
inserted at the end of Paragraph 1.E. of Article IX to read as follows: 
 Notwithstanding anything to the contrary expressed or implied
herein, the common stock of Westar Energy, Inc. shall be eliminated as an investment option under the Plan upon the earlier to occur of (1) the effective date of the merger of Westar Energy, Inc. with or acquisition by Great Plains Energy, Inc.
or any affiliated entity; or (2) June 30, 2017. Participants who own shares of Westar Energy, Inc. in their Plan Account immediately prior to consummation of the transaction contemplated in option (1) above will participate in such
transaction on the same financial terms as regular shareholders of Westar Energy, Inc. common stock, but will only receive cash instead of a combination of cash and Great Plains Energy, Inc. common stock. Participants who own shares of Westar
Energy, Inc. in their Plan Account on the date specified in option (2) above will be deemed to have elected to sell all of their Westar Energy, Inc. shares on such date in accordance with the Plan’s terms. All proceeds from the liquidation
of Westar Energy, Inc. common stock, whether the result of option (1) or option (2) above, shall be reinvested in the Participant’s Plan Account according to the Participant’s existing investment elections on file with the Plan
Administrator. 
 2.    Effective June 30, 2017, the final sentence of Paragraph 6.A. of Article IX is deleted in
its entirety. 
 3.    Effective January 1, 2016, Paragraph 3 of Article XI is amended to read as follows: 

Except as provided in paragraph 6 of this Article XI, below, when a Participant dies or his/her employment with the Company is terminated by
retirement or for any other reason (except transfer of employment to a subsidiary of the Company participating in the Plan), the entire balance of the account may be distributed in an immediate lump sum payment of cash and/or securities to the
Participant, or his/her surviving spouse, beneficiaries or legatees, or heirs, respectively, at the election of whomever is entitled thereto. The determination of the distributee or distributees in the event of a Participant’s death shall be
made in accordance with Article XIII of the Plan. If the Participant does not elect to receive distribution of his/her Accrued Benefit in the form of an immediate lump sum upon termination of employment, the Participant shall be deemed to have made
an election to defer the payment and distribution of the Participant’s Accrued Benefit in accordance with Paragraph 6 of this Article IX. 

Notwithstanding anything herein to the contrary and subject to paragraph 7, below, if the Participant’s vested interest in the Plan
does not exceed Five Thousand Dollars ($5,000.00), the Participant’s Accrued Benefit shall be distributed to the Participant in an immediate lump sum distribution as soon as reasonably practicable following his/her termination of employment.
The determination of whether the Participant’s vested interest in the Plan exceeds $5,000 shall include that portion of the account balance attributable to rollover contributions (and earnings allocable thereto) within the meaning of Code Sec.
402(c), Code Sec. 403(a)(4), Code Sec. 403(b)(8), Code Sec. 408(d)(3)(A)(ii), and Code Sec. 457(e)(16). In no event shall payments be delayed in violation of Code Sec. 401(a)(14). 

4.    Effective January 1, 2016, the text within Paragraph 4 of Article XI is deleted in its entirety, but succeeding
paragraphs within Article XI shall retain their original numbering. 

 5.    Effective January 1, 2016, Paragraph 6 of Article XI is
amended to read as follows: 
 A Participant shall be deemed to have elected to defer the distribution of his/her account if he/she does not
affirmatively elect to receive an immediate lump sum distribution after he/she has been advised in writing by the Committee of his/her right to defer distribution under this paragraph 6, of this Article XI, upon termination of his/her employment by
retirement or for any other reason; provided, however, in no event shall commencement of a Participant’s distribution be deferred beyond the Required Beginning Date specified in Paragraph 11 of this Article XI. 

6.    Effective January 1, 2016, Paragraph 8.A. of Article XI is amended to read as follows: 

Subject to subparagraph 8.B., below, if a Participant makes the affirmative or deemed election of deferral of distribution provided in
paragraph 6. of this Article XI, above, his/her account shall continue to be maintained in the Trust in the manner provided by the Plan. Subject to the prior approval and consent of the Committee, the Participant may at any time thereafter request
in writing that distribution of his/her account be made. When such a request is approved by the Committee, the Participant’s account shall be distributed to the Participant within a reasonable time following receipt and approval of that
request; provided that such a deferred distribution of a Participant’s account shall be only in the following sequence: first, either all of his/her account, or all of his/her Participant contributions; second, the balance of the account not
previously distributed; thus, all of a Participant’s contributions must be distributed to him/her at one time, and no Company contributions can be distributed without previous or concurrent distribution of all Participant contributions. A
Participant who has withdrawn all of his/her own contributions prior to deferral of distribution hereunder may thereafter request and receive only a single distribution of the balance of his/her account. No earnings credited to the account of a
Participant can be distributed to him/her after his/her termination of employment with the Company without liquidating the total account balance. 

7.    Effective January 1, 2016, the text within Paragraph 9 of Article XI is deleted in its entirety, but succeeding
paragraphs within Article XI shall retain their original numbering. 
 8.    Effective January 1, 2016, Paragraph
10 of Article XI is amended to read as follows: 
 If a Participant who has made the affirmative or deemed election to defer receipt of
his/her account under paragraph 6. of this Article XI, above, dies before a complete distribution of the account has been made, then upon his/her death, his/her entire account balance shall be distributed to his/her surviving spouse, beneficiaries,
or legatees in accordance with paragraph 11 of this Article XI. 
 9.    Effective January 1, 2016, Paragraph
11.B.1. of Article XI is amended to read as follows: 
 Required Beginning Date. Distribution of a Participant’s Accrued Benefit
will commence no later than the Participant’s Required Beginning Date, as defined in Subparagraph 11.D.2., below. 

10.    Effective January 1, 2017, Paragraph 11.C.1. of Article XI is amended to read as follows: 

Required Distributions. Distribution of a Participant’s Accrued Benefit upon reaching the Participant’s Required Beginning
Date shall be paid to such Participant in the form of minimum required distributions calculated in accordance with Code Section 401(a)(9). 

11.    Effective January 1, 2017, Paragraph 11.C.2. of Article XI is amended to read as follows: 

Distributions in Event of Death of Participant. In event of the death of a Participant prior to the distribution of the
Participant’s entire interest under the Plan, the Participant’s entire interest in the Plan shall be distributed to the Participant’s Designated Beneficiary no later than December 31 of the fifth year after the Participant’s
death. 

 12.    Effective January 1, 2017, Paragraph 7 of Article XII is
amended to read as follows: 
 Except as otherwise provided in paragraph 11, below, subject to prior approval of the Committee, a Participant
who has completed five (5) years of participation in this Plan may be allowed to withdraw from the Plan at any time and from time to time an amount not exceeding the entire balance in his/her Accounts at any time after his/her attainment of age
fifty-nine and one-half (591⁄2); provided, the amount of any Participant withdrawal shall be at least Five Hundred Dollars
($500.00) or the full value of the Participant’s Account, if less. This right to withdrawal shall be exercised by application or request to the Committee or its authorized representative in writing or by electronic medium, telephone voice
response system or other means determined and prescribed by the Committee. 
 13.    Effective January 1, 2017,
Paragraph 18.D. of Article XII is amended to read as follows: 
 No Participant loan shall exceed 50% of the present value of the
Participant’s vested Accrued Benefit.EX-4.8

 Exhibit 4.8 

AMENDMENT NO. 7 TO 

ONEOK, INC. 401(K) PLAN 
 (As
amended and restated effective January 1, 2014) 
  

	1.	 Effective January 1, 2017, the first sentence of Paragraph 15 of Article I is amended to read as follows:

 The total annual base salary plus any lump sum merit pay and promotion awards, gainshare awards, cash incentive compensation,
commissions, overtime pay, and shift differentials paid to a Participant by the Company, but excluding amounts credited by the Company under a plan of deferred compensation to the extent that such notional contributions are not includible in gross
income of the Participant for the taxable year in which notionally contributed, and excluding compensation paid after a Participant’s death or other termination of employment. 

 

	2.	 Effective January 1, 2017, Paragraph 4.A. of Article III is amended to read as follows:

 Each Participant in the Plan, unless such Participant elects otherwise in writing, shall be deemed to have also made an elective
deferral of his/her Compensation in an amount equal to the ESOP Dividend Distribution paid and distributed in cash to such Participant pursuant to subparagraphs 2.B. of Article X. Such ESOP Dividend Distribution shall not be considered an
elective deferral under Code Section 402(g), and shall not be subject to Code Sections 401(k) or 415. A Participant’s election in writing to not defer the ESOP Dividend Distribution shall be made at the time and in
the manner provided for in rules and procedures prescribed by the Committee. 
  

	3.	 Effective January 1, 2017, Paragraph 1 of Article VII is amended to read as follows:

 The Company shall make Matching Contributions for Participants in the Plan as provided for in this Article VII, below. 

For Plan Years beginning on and after January 1, 2008, upon and after a Non-Bargaining Unit Participant’s
commencement of participation in the Plan, subject to the limitations specified herein and in Article VIII, the Company shall regularly contribute, out of its net earnings and earned surplus as reflected by its books of account, and shall pay to the
Trustee, at such times as determined by the Company, amounts of Matching Contributions equal to the Company’s 401(k) Contributions for that Non-Bargaining Unit Participant, or that Non-Bargaining Unit Participant’s After-Tax Deposits, as provided for herein below. 
  

	A.	 Non-Bargaining Unit Participants 

1.    The Company shall make a Matching Contribution for each Non-Bargaining Unit
Participant which shall be equal to the Company’s 401(k) Contribution for such Participant based upon such Participant’s elected Reduction in Compensation and deferral for each pay period, subject to the limitation stated in clause
(3) of this subparagraph 1.A., below; provided, that the Company shall not make any Matching Contribution for such a Non-Bargaining Unit Participant with respect to that part of the Company’s 401(k)
Contribution that is an ESOP Dividend Distribution/Additional Deferral Contribution. 
 2.    After making the Matching
Contribution provided for in subparagraph A. of this paragraph 1. above, the Company shall make a Matching Contribution for each Non-Bargaining Unit Participant which shall be equal to such Participant’s After-Tax Deposits for each pay period, subject to the limitation stated in clause (3) of this subparagraph 1.A., below. 

3.    The aggregate Matching Contributions of the Company under clauses (1) and (2) of this subparagraph 1.A. for a Non-Bargaining Unit Participant hereunder shall not exceed six percent (6%) of the Non-Bargaining Unit Participant’s Compensation. 

 4.    A full Matching Contribution shall be made for a Participant whose
401(k) Contributions equal the deferral limitation under Code Section 402(g) prior to the Plan limit on Matching Contributions being reached for the Plan Year. If the Company’s 401(k) Contributions based upon a Participant’s elected
Reduction in Compensation equal the Code Section 402(g) limitation at any time during a Plan Year, and when such limitation is reached no further Company 401(k) Contributions or After-Tax Deposits are
made for or by such Participant for that Plan Year, and the amount of Matching Contributions made for the Plan Year is then less than the Maximum Matching Contribution Amount, the Company shall thereafter make Matching Contributions for one or
more pay periods for the Participant relating to such Plan Year until the total Matching Contributions made for the Participant for that Plan Year equal such Maximum Matching Contribution Amount. For purposes of this subparagraph A.4, the term
“Maximum Matching Contribution Amount” shall mean the lesser of (i) the total amount of the Company’s 401(k) Contributions for the Participant and the Participant’s After-Tax
Contributions for that Plan Year, or (ii) six percent (6%) of the total of the Participant’s compensation for that Plan Year. 
  

	4.	 Effective January 1, 2017, Paragraph 2.B.4 of Article X is deleted in its entirety. 

 

	5.	 Effective January 1, 2017, Paragraph 1.D of Article XII is amended to read as follows:

 A withdrawal will be deemed to be made on account of an immediate and heavy financial need if it is on account of: 

1.    Expenses for (or necessary to obtain) medical care that would be deductible under Code Section 213(d)(determined
without regard to whether the expenses exceed 7.5% of adjusted gross income described in Code Section 213(d) previously incurred by the Participant, the Participant’s spouse or domestic partner (who is the Participant’s designated
beneficiary), or any dependents; 
 2.    Costs directly related to the purchase of a principal residence for the
Participant (excluding mortgage payments); 
 3.    Payment of tuition, related educational fees and room and board
expenses, for up to the next twelve (12) months of post-secondary education for the Participant, or the Participant’s spouse, domestic partner (who is the Participant’s designated beneficiary), children, or dependents, as
defined in Code Section 152, without regard to Code Section 152(b)(1),(b)(2) and (d)(1)(B); 
 4.    Payments
necessary to prevent the eviction of the Participant from his/her principal residence or foreclosure on the mortgage on that residence; 

5.    Payments for burial or funeral expenses for the Participant’s deceased parent, spouse, domestic partner (who
is the Participant’s designated beneficiary), children or dependents (as defined in Code Section 152, without regard to Code Section 152(d)(1)(B); 

6.    Expenses for the repair or damage to the Participant’s principal residence that would qualify for the casualty
deduction under Code Section 165 (determined without regard to whether the loss exceeds ten percent (10%) of adjusted gross income; and 

7.    Such other facts and circumstances as the Commissioner of Internal Revenue lists as deemed immediate and heavy
financial needs through publication of regulations, revenue rulings, notices, and other documents of general applicability. 
  

	6.	 Effective January 1, 2017, Paragraph 1.E. of Article XII is amended to read as follows:

 Notwithstanding anything otherwise expressed or implied in the Plan, or under Code Section 401(k), or the regulations under that
section, a hardship distribution shall not be determined or allowed under the Plan on account of an event or condition of immediate and heavy financial need of a person who is a beneficiary of a Participant under the Plan, unless such person, in
addition to being such a beneficiary, also has a relationship of being the spouse, the domestic partner, or a dependent of the Participant and an immediate and heavy financial need of such person for which a hardship distribution is expressly
allowable to a spouse, domestic partner, child or dependent under the terms and provisions of paragraph 1.D, above; and a hardship distribution shall not otherwise be allowed under the Plan for or with respect to circumstances of immediate
and heavy financial need of a beneficiary of a Participant if such beneficiary is not either the spouse, domestic partner, child or a dependent of the Participant. 

	7.	 Effective January 1, 2017, Paragraph 1.F. of Article XII is amended to read as follows:

 A Participant’s Elective Deferrals under the Plan (and Participant Contributions) shall be suspended for six (6) months after
receipt of the hardship distribution, unless such suspension is not required due to applicable guidance issued by the Secretary of the Treasury or by the Internal Revenue Service. 

 

	8.	 Effective January 1, 2017, the third paragraph of Paragraph 2 of Article XII is amended to read as
follows: 

 A withdrawal pursuant to this paragraph may be made upon request of the Participant subject to such limitations on frequency of
withdrawals as the Committee, in its discretion, may determine. Such withdrawal shall be paid as soon as practicable after the appropriate request is received by the Trustee. A withdrawal shall be paid in cash, except as provided herein. If a
Participant’s After-Tax Deposits are invested in ONEOK, Inc. Common Stock, the Participant must order the sale of the ONEOK, Inc. Common Stock (including fractional shares), move the proceeds into another
investment option, and subsequently withdraw the proceeds. A Participant who has After-Tax Deposits in his/her Plan Account invested in stock of a prior employer which has been transferred to the Trust
pursuant to any merger, acquisition or similar transaction within the preceding six months may also request distribution of such stock in a manner comparable to that provided in the foregoing provisions with respect to ONEOK, Inc. Common
Stock. If more than six months have elapsed since such merger, acquisition or similar transaction, then the stock of such prior employer may be withdrawn in cash or in kind, at the Participant’s election. 

 

	9.	 Effective June 16, 2017, the first sentence of Paragraph 1 of Article XV is amended to read as follows:

 The Plan shall be administered by the ONEOK, Inc. Benefit Plan Administrative Committee (the “Committee”) consisting of the
Company’s Chief Financial Officer and Executive Vice President – Strategic Planning and Corporate Affairs; Vice President – Human Resources; Vice President – Treasury and Risk; and their respective successors
in title or duties, authority and function. 
  

	10.	 Effective June 16, 2017, the second sentence of Paragraph 3 of Article XV is amended to read as follows:

 The ONEOK, Inc. Benefit Plan Sponsor Committee shall consist of the Company’s President and Chief Executive Officer; Executive Vice
President and Chief Administrative Officer; Chief Financial Officer and Executive Vice President – Strategic Planning and Corporate Affairs; Executive Vice President and Chief Operating Officer; Senior Vice President –
Finance and Treasurer; Senior Vice President, General Counsel and Assistant Secretary; Vice President – Human Resources; Vice President, Secretary and Associate General Counsel; and their respective successors in title or duties, authority
and function.

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