Document:

EX-4.2

 Exhibit 4.2 

Amendment to 
 ONEOK,
Inc. 401(k) Plan 
 (Immediate Eligibility) 

1.    Effective January 1, 2015, Paragraph 2 of Article II of the ONEOK, Inc. 401(k) Plan (the “Plan”) is amended in its
entirety to read as follows: 
  

	 	2.	 Commencement of Participation 

Subject to Article XXIV, an Employee who is eligible on or before the Consolidated Plan Effective Date of the Plan may commence his/her initial
Participation therein as of that date. Any Employee who prior to January 1, 1999, was eligible to participate in, or who was a participant in the Prior ONEOK, Inc. Thrift Plan or the KGS 401(k) Thrift Plan shall be eligible to participate in
this Plan on and after January 1, 1999. Any other eligible Employee may commence initial participation as of the date he/she becomes eligible if it is the first day of a month and he/she completes enrollment in the Plan or before that
day, or otherwise as of the first day of the calendar month next following the month in which he/she becomes eligible; provided, however, that no Employee who is on authorized leave of absence on the date he/she becomes eligible may commence to
participate in the Plan until the first day of the calendar month following his/her return to active service; and provided, further, that such Employee may in any event participate in the Plan not later than the earlier of the first day of the Plan
Year after such Employee has met the requirements for eligibility under this Plan, or six (6) months after the day such requirements are met. Any eligible Employee who does not commence to participate
in the Plan on the earliest date when he/she is eligible to do so may thereafter commence participation as of the first day of the calendar month following the month in which he/she elects to participate and makes application to do so to the
Company. Commencement of participation in the Plan by an eligible Employee shall be accomplished by his/her election to make deposits or a Reduction in Compensation, as hereinafter provided. 

2.    Effective January 1, 2015, Paragraph 6 of Article II of the Plan is amended in its entirety to read as follows: 

 

	 	6.	 Reentry of Participant 

If a former Participant whose employment has terminated shall be rehired as an Employee, he/she shall be eligible entitled to
reenter the Plan as a Participant on the first day of the month next following such reemployment. 

3.    Effective January 1, 2015, Paragraph 2 of Article VI of the Plan is amended in its entirety to read as follows: 

 

	 	2.	 Reinstatement of Voluntarily Suspended Reduction in Compensation or
After-Tax Deposits 

 A Participant may at any time elect in writing to
reinstate his/her Reduction in Compensation or After-Tax Participant Deposit to the Plan which he/she previously voluntarily suspended. Such election to reinstate a previously suspended Reduction in
Compensation or After-Tax Participant Deposit shall be made in the manner prescribed by the Committee and shall be effective as soon as administratively practicable on the first day of the
calendar quarter next following the end of the calendar month in which after the Participant’s written election for such reinstatement is received by the CompanyEX-4.3

 Exhibit 4.3 

Amendment to 
 ONEOK,
Inc. 401(k) Plan 
 (Conforming and Clarifying Amendments) 

1.    Effective January 1, 2014, the first sub-paragraph within Paragraph 2.A.1. of Article
III of the ONEOK, Inc. 401(k) Plan (the “Plan”) is amended to read as follows: 
 1.    Each Employee who is a Non-Bargaining Unit Participant in this Plan may elect a Reduction in Compensation in an amount not in excess of twenty-four percent (24%) of his/her Compensation (but without giving effect to the limits set
forth in Section 401(a)(17) of the Code) or the limitation on exclusion of elective deferrals for his/her taxable year, provided in Code Section 402(g), subject to applicable cost-of-living adjustment thereunder, or as provided in any successor provision of the federal tax law. 

2.    Effective January 1, 2014, Paragraph 2.A.2. of Article III of the Plan is amended in its entirety to read as follows: 

2.    For purposes of the foregoing and the Plan “Catch-Up Contributions”
are Elective Deferrals made to the Plan that are in excess of an otherwise applicable Plan limit and that are made by Participants who are aged fifty (50) or over by the end of their taxable year. An otherwise applicable limit is a limit in the
Plan that applies to Elective Deferrals without regard to Catch-Up Contributions, such as limits on annual additions, the applicable limit on Elective Deferrals under Code Section 402(g) (not
counting Catch-Up Contributions) and the limit imposed on the actual deferral percentage (ADP) test under Code Section 401(k)(3). Catch-Up Contributions for a
Participant may be made under the Plan, and for a taxable year may not exceed (1) the limit on Catch-Up Contributions under Code Section 414(v)(2)(B)(I) for the taxable year or (2) when
added to other Elective Deferrals, 75 percent of the Participant’s Compensation (but without giving effect to the limits set forth in Section 401(a)(17) of the Code) for the taxable year. 

3.    Effective January 1, 2014, Paragraph 2.A.4. of Article III of the Plan is amended in its entirety to read as follows: 

4.    Participant elections of Reduction in Compensation shall specify the whole percentage of the Participant’s
Compensation (and without giving effect to the limits set forth in Section 401(a)(17) of the Code) which such Participant elects not to receive in cash and to defer as his/her Reduction in Compensation. 

4.    Effective January 1, 2014, Paragraph 14 of Article XI of the Plan is amended in its entirety to read as follows: 

 

	 	14.	 Qualified Domestic Relations Orders; Distributions 

Notwithstanding any other provisions of the Plan, if a Participant’s account is ordered paid, transferred, or assigned, in whole or in
part, to an alternate payee pursuant to an order determined by the Plan Administrator to be a Qualified Domestic Relations Order within the meaning of Code Section 414(p), the payment and distribution to such alternate payee of amounts
attributable to the Participant’s account shall be made by the Plan and Trustee in a single lump sum distribution, and such distribution to such alternate payee shall be made pursuant to such a Qualified Domestic Relations Order on or
after prior to the date on which the Participant attains or would have attained the earliest retirement age under the Plan, and within a reasonable period of time after such determination, if such payment is otherwise permissible
under Code Section 414(p). For purposes of this paragraph 14., the term “earliest retirement age” shall mean the earlier of (i) the date on which the Participant is entitled to a distribution under the Plan, or (ii) the
later of (a) the date the Participant attains age fifty (50), or (b) the earliest date on which the Participant could begin receiving benefits under the Plan if the Participant separated from service. Periodic distributions authorized from
plan accounts assigned to alternate payees under the KGS 401(k) Thrift Plan pursuant to a Qualified Domestic Relations Order shall be made in accordance with such Order, notwithstanding the foregoing provisions generally providing for immediate
distribution. 

 5.    Effective January 1, 2014, Paragraph 1 of Article XIX of the Plan is amended
in its entirety to read as follows: 
 1.    The Plan shall be governed by and construed in accordance with the laws of
the State of Oklahoma. Any interpretation of the Plan by the Committee shall be conclusive and may be relied upon by the Trustee and all parties in interest. Any conflict between the terms of this Plan document and any other communication
regarding the Plan shall be resolved in favor of this Plan document. If any provision of this Plan is held to be invalid or unenforceable, such invalidity or unenforceability shall not affect any other provision of the Plan, and the remaining
provisions of the Plan shall be construed and enforced in accordance with the Company’s stated intent or the Committee’s discretionary interpretation thereof, as if such provision had not been included. Internal
cross-references within the plans are not intended to be conclusive and should be adjusted as the context may require in order to reflect their most logical association. 

6.    Effective January 1, 2014, the following statement is added to the end of Paragraph 7 of Article XV of the Plan: 

By participating in the Plan, each Participant is deemed to have waived any right to participate in any class action or accept any form of
personal recovery (equitable, monetary or otherwise) therefrom. Moreover, each Participant shall be deemed to have agreed to participate in binding arbitration or such other means of alternate dispute resolution as the Company or the Committee may
require from time to time.EX-4.4

 Exhibit 4.4 

Amendment to 
 ONEOK,
Inc. 401(k) Plan 
 (Eligible Automatic Contribution Arrangement) 

1.    Effective January 1, 2015, paragraph 57 of Article I of the ONEOK, Inc. 401(k) Plan (the “Plan”) is amended in its
entirety to read as follows: 
  

	 	57.	 Reduction in Compensation 

The reduction in Compensation payable to the Employee by the Company, which is elected voluntarily by the Employee under paragraphs 1 and 2 of
Article III, or deemed to have been elected voluntarily pursuant to paragraph 9 of Article III, but not including any deemed elected additional deferral for Non-Bargaining Unit
Participants made under paragraph 43 of Article III. 
 2.    Effective January 1, 2015, paragraph
3 of Article II of the Plan is amended in its entirety to read as follows: 
  

	 	3.	 Participation Voluntary; Eligible Automatic Contribution Arrangement 

A.     General. Participation in the Plan by eligible Employees shall be voluntary. A Participant may become
temporarily ineligible to participate in the event of termination or suspension of his/her participation pursuant to the terms of the Plan. 

B.    Automatic Enrollment. An eligible Employee who is notified of the Eligible Automatic Contribution Arrangement
described in paragraph 9 of Article III shall be deemed to have elected to participate in the Plan for all purposes in accordance with the terms thereof, unless and until he/she affirmatively elects not to be a Participant and/or is no longer
eligible to participate in the Plan. 
 3.    Effective January 1, 2015, paragraph 4 of Article II of the Plan is amended in
its entirety to read as follows: 
  

	 	4.	 Confirmation of Participation 

Each Employee at the time of becoming a Participant in the Plan shall be given or provided direct electronic access to a copy of the Plan
and/or summary plan description of the Plan as effective at that time. As a condition of becoming a Participant in the Plan an Employee shall either sign an instrument in such form as prescribed by the Committee or otherwise provide by
electronic or other medium prescribed by the Committee a statement satisfactory to the Committee evidencing the fact that the Employee intends to be a Participant and he/she accepts and agrees to all the provisions of the Plan; and the Committee may
also require by such means the consent of the spouse of the Participant if the Participant is married and the primary beneficiary designated is not the spouse of the Participant. 

4.     Effective January 1, 2015, paragraph 1 of Article III of the Plan is amended in its entirety to read as follows: 

 

	 	1.	 Company 401(k) Contributions 

The Company shall contribute to the Trust for each Plan Year, that portion of the net earnings of the Company for that year equal to the amount
of the Reduction in Compensation elected (or deemed to have been elected) by each Participant, and ESOP Dividend Distribution/Additional Deferral Contribution elected and agreed to and deemed elected by each Participant pursuant to paragraphs
2. and 3. of this Article III, to the extent provided therein. Such contributions shall be the Company’s 401(k) Contribution for the Participant 

 5.     Effective January 1, 2015, paragraph 2.A.6. of Article III of the Plan is
amended in its entirety to read as follows: 
 6.    Subject to paragraph 9 of this Article III, below,
tThe Reduction in Compensation elected by a Non-Bargaining Unit Participant (in accordance with paragraph 2.A.1 of this Article III, above) shall remain in effect until changed by such
Participant’s delivery of a change of election in the manner provided herein. A Non-Bargaining Unit Participant may change his/her Reduction in Compensation only on a Designation Date. A Non-Bargaining Unit Participant’s change of election may designate a different percentage of Reduction in Compensation, subject to the terms and conditions of the Plan; and may state that such Participant
elects no Reduction in Compensation and deferral after the Designation Date until he/she makes a subsequent change of election hereunder. Change of election by written direction or by electronic medium, voice response or other means determined and
prescribed by the Committee may be delivered or transmitted by a Non-Bargaining Unit Participants at any time, but shall be effective only as of the Designation Date next following the date of the delivery of
such change of election to the Committee. 
 6.    Effective January 1, 2015, Article III of the Plan is amended to add a new
paragraph 9 as follows (and to update internal cross-references accordingly): 
 9.     Eligible Automatic
Contribution Arrangement 
 A.     Rules of Application. 

1.     This paragraph 9 is intended to set forth the terms and conditions for an “eligible automatic contribution
arrangement” within the meaning of Section 414(w) of the Code. To the extent that any other provision of the Plan is inconsistent with the provisions of this paragraph 9, the provisions of this paragraph 9 shall control. 

 2.     Automatic Elective Deferrals will be made on behalf of each eligible Employee who does not have an
affirmative election in effect regarding a Reduction in Compensation as of January 1, 2015. Automatic Elective Deferrals also will be made on behalf of each Participant who elected a Reduction in Compensation of less than 6% as of
January 1, 2015. Automatic Elective Deferrals will thereafter be made on behalf of each newly eligible or rehired Employee. The amount of Automatic Elective Deferrals made for a Participant each pay period will be equal to the
Automatic Election Percentage multiplied by the Participant’s eligible Compensation (without giving effect to the limits set forth in Section 401(a)(17) of the Code) for the pay period.  

3.    The Automatic Elective Deferrals made on behalf of Participants shall not be Roth Elective Deferrals. 

4.    Notwithstanding anything herein to the contrary, a Participant will have a reasonable opportunity, after receipt
of the notice described in paragraph 9.D., below, to make an affirmative election regarding Automatic Elective Deferrals (including an election to opt out of Automatic Elective Deferrals or a Reduction in Compensation in a different amount) before
any Automatic Elective Deferrals are made on the Participant’s behalf. A Participant also may elect to make Reductions in Compensation in lieu of Automatic Elective Deferrals, in accordance with the terms of the Plan, at any time after
commencement of Automatic Elective Deferrals. Automatic Elective Deferrals being made on behalf of a Participant will cease or be replaced with a Reduction in Compensation, as applicable, as soon as administratively feasible after the Participant
makes such an affirmative election. 
 5.    A Participant may change the manner in which future Automatic
Elective Deferrals are to be invested, at any time, in accordance with the terms of the Plan. 
 6.    The Plan
shall have 6 months (rather than 21⁄2 months) after the end of each Plan Year to distribute Excess Contributions and Excess Aggregate Contributions
and thereby avoid the applicable excise tax on such amounts under Code Section 4979. 

 B.     Definitions. 

1.     An “Eligible Automatic Contribution Arrangement” or “EACA” is an automatic contribution
arrangement that satisfies the uniformity and notice requirements of this paragraph 9.  
 2.    An
“automatic contribution arrangement” is an arrangement under which, in the absence of an affirmative election by an eligible Employee, such Employee is deemed to have elected to participate in the Plan and to have elected that a certain
percentage of compensation will be withheld from his/her pay and contributed to the Plan as a Reduction in Compensation. 

3.    “Automatic Elective Deferrals” are the amounts contributed to the Plan under this paragraph 9 of this
Article III.  
 4.    The “Automatic Election Percentage” is six percent (6%). 

C.     Uniformity Requirement. 

1.     Except as provided in paragraph 9.C.2., below, the same percentage of pay will be withheld as Automatic Elective
Deferrals from all similarly-situated Participants.  
 2.    Automatic Elective Deferrals will be reduced or
stopped to meet the limitations under Code Sections 401(a)(17), 402(g), and 415 and to satisfy any suspension period required after a hardship distribution under the Plan.  

D.      Notice Requirement. 

1.     At least 30 days, but not more than 90 days, before the beginning of each Plan Year, the Plan Administrator will
provide each Participant with notice of the Participant’s rights and obligations under the EACA. The notice will be provided to new hires, rehires and newly eligible Employees as soon as administratively practicable, but in no event later than
the date the Employee becomes eligible to participate in the Plan.  
 2.    The notice referenced in paragraph
D.1., above, will describe: 
         a.        The
amount of Automatic Elective Deferrals that will be made on the Participant’s behalf in the absence of an affirmative election of the Participant to opt out of Automatic Elective Deferrals or to make Reductions in Compensation in a different
amount;  
         b.        The Participant’s
right to elect to have no Automatic Elective Deferrals made on his or her behalf or to elect Reductions in Compensation in a different amount; 

        c.        How Automatic Elective Deferrals will be
invested in the absence of investment directions given by the Participant pursuant to the provisions of the Plan; and 

        d.        The Participant’s limited right to
withdrawal of Automatic Elective Deferrals and the procedures for making such a withdrawal. 
 E.      Withdrawal
of Default Elective Deferrals 
 1.    No later than 90 days after Automatic Elective Deferrals are first withheld
from a Participant’s pay, the Participant may request a taxable distribution of his or her Automatic Elective Deferrals. Spousal consent is not required for any such withdrawal of Automatic Elective Deferrals. 

2.     The amount to be distributed from the Plan upon the Participant’s request is equal to the amount of
Automatic Elective Deferrals made through the earlier of (a) the pay date for the second payroll period that begins after the Participant’s withdrawal request, and (b) the first pay date that occurs after
30 days after the Participant’s request, plus attributable earnings through the date of distribution. Any fee charged to the Participant for the withdrawal may not be greater than any other fee charged for a cash distribution from the Plan.

 3.     Unless the Participant affirmatively elects otherwise, any
withdrawal request under this paragraph 9.E. will be treated as an affirmative election to stop having Reductions in Compensation made on the Participant’s behalf as of the date specified in paragraph 9.E.2., above. 

4.     Automatic Elective Deferrals distributed pursuant to this paragraph 9.E. are not counted towards the
dollar limitation on Elective Deferrals contained in Code § 402(g), nor for the Actual Deferral Percentage limitations set forth in paragraph 3 of Article VIII. Company Matching Contributions that might otherwise be allocated to a
Participant’s account on behalf of Automatic Elective Deferrals will not be allocated to the extent the Participant withdraws such Automatic Elective Deferrals pursuant to this paragraph 9.E. and any Company Matching Contributions already made
on account of Automatic Elective Deferrals that are later withdrawn pursuant to this paragraph 9.E. will be forfeited. 
 7.
    Effective January 1, 2015, paragraph 9 of Article VIII of the Plan is amended by replacing each reference to “21⁄2 months”
and “two and one-half (21⁄2) months” with the phrase “six (6) months.” 

8.     Effective January 1, 2015, paragraph 10 of Article VIII of the Plan is amended by replacing each reference to “21⁄2 months” and “two and one-half
(21⁄2) months” with the phrase “six (6) months.”

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