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Item 9A. Controls and Procedures

2026-02-24 compared with 2025-02-25 · 209 added, 415 removed, 198 unchanged (76% of the section changed)

7 unchanged sentences

Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Based on our evaluation under that framework, our management concluded that our internal control over financial reporting was effective as of Dec.

Our evaluation of the effectiveness of internal control over financial reporting excludes the EnLink Controlling Interest Acquisition and the Medallion Acquisition.

Our Consolidated Statement of Income for the year ended Dec.

31, 2024, includes approximately 7% and 1% of total revenue attributable to EnLink and Medallion, respectively, and our Consolidated Balance Sheet as of Dec.

31, 2024, includes approximately 20% and 3% of total assets attributable to EnLink and Medallion, respectively, that were excluded from management’s assessment of the effectiveness of internal controls over financial reporting.

In accordance with guidance issued by the SEC, companies are allowed to exclude acquisitions from their assessment of internal control over financial reporting during the first year subsequent to the acquisition while integrating the acquired operations.

The effectiveness of our internal control over financial reporting as of Dec.

31, 2024, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which is included herein (Item 8).

Based on our evaluation under that framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2025.

The effectiveness of our internal control over financial reporting as of December 31, 2025, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which is included herein (Item 8).

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting during the quarter ended Dec.

31, 2024, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

There have been no changes in our internal control over financial reporting during the quarter ended December 31, 2025, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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OTHER INFORMATION

During the three months ended Dec.

31, 2024, no director or officer of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangements,” as each term is defined in item 408(a) Regulation S-K.

During the three months ended December 31, 2025, no director or officer of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangements,” as each term is defined in item 408(a) Regulation S-K.

DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

19 unchanged sentences

Information concerning the ownership of certain beneficial owners is set forth in our 2026 definitive Proxy Statement and is incorporated herein by this reference.

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Security Ownership of Management

1 unchanged sentence

Equity Compensation Plan Information

The following table sets forth certain information concerning our equity compensation plans as of Dec.

The following table sets forth certain information concerning our equity compensation plans as of December 31, 2025:

Plan Category Number of Securities

1 unchanged sentence

Outstanding Options,

Warrants and Rights Weighted-Average

Warrants and Rights (3)

Weighted-Average

Exercise Price of

Outstanding Options,

Warrants and Rights (3) Number of Securities

Warrants and Rights (4)

Number of Securities

Remaining Available For

6 unchanged sentences

not approved by security holders (2)

271,034 $ 100.40 —

Total 3,661,617 — 20,166,969

(1) - Includes shares granted under our Employee Stock Purchase Plan, Employee Stock Award Program and restricted stock incentive unit awards and performance unit awards granted under our former Equity Compensation Plan, our Equity Incentive Plan and the assumed former Magellan Midstream Partners, L.P., Long-Term Incentive Plan.

For a brief description of the material features of these plans, see Note L of the Notes to Consolidated Financial Statements in this Annual Report.

(2) - Includes our NQDC Plan, Deferred Compensation Plan for Non-Employee Directors and our former Stock Compensation Plan for Non-Employee Directors.

For a brief description of the material features of these plans, see Notes L and M of the Notes to Consolidated Financial Statements in this Annual Report.

(3) - There is no exercise price associated with restrictive stock incentive unit awards and performance unit awards.

Compensation deferred into our common stock under our Deferred Compensation Plan for Non-Employee Directors is distributed to participants at fair market value on the date of distribution.

The price used for these plans to calculate the weighted-average exercise price in the table is $100.40, which represents the 2024 year-end closing price of our common stock on the NYSE.

(4) - Includes 1,459,223, 2,379 and 3,234,314 shares available for future issuance under our Employee Stock Purchase Plan, Employee Stock Award Program and Equity Incentive Plan, respectively.

(1) - Included our Employee Stock Purchase Plan, 2025 Employee Stock Award Program, Equity Compensation Plan, 2018 Equity Incentive Plan and 2025 Equity Incentive Plan.

For a brief description of the material features of these plans, see Note K of the Notes to Consolidated Financial Statements in this Annual Report.

(2) - Included the assumed EnLink Midstream, LLC, Long-Term Incentive Plan.

For a brief description of the material features of this plan, see Note K of the Notes to Consolidated Financial Statements in this Annual Report.

(3) - Included grants of restricted stock unit awards, performance awards and director stock awards deferred as phantom stock units under our Deferred Compensation Plan for Non-Employee Directors.

(4) - There is no exercise price associated with restrictive stock unit awards, performance unit awards or director stock awards as phantom stock units under our Deferred Compensation Plan for Non-Employee Directors.

(5) - Included 969,316, 633,084 and 18,564,569 shares available for future issuance under our Employee Stock Purchase Plan, 2025 Employee Stock Award Program and 2025 Equity Incentive Plan, respectively.

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

2 unchanged sentences

Information concerning the principal accountant’s fees and services is set forth in our 2026 definitive Proxy Statement and is incorporated herein by this reference.

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EXHIBITS, FINANCIAL STATEMENT SCHEDULES

2 unchanged sentences

(b) Consolidated Statements of Income for the years ended

31, 2024, 2023 and 2022 67

December 31, 2025, 2024 and 2023 67

31, 2024, 2023 and 2022 67

(d) Consolidated Balance Sheets as of Dec.

31, 2024 and 2023 68

December 31, 2025, 2024 and 2023 67

(d) Consolidated Balance Sheets as of December 31, 2025 and 2024 68

(e) Consolidated Statements of Cash Flows for the years ended

31, 2024, 2023 and 2022

December 31, 2025, 2024 and 2023 69

(f) Consolidated Statements of Changes in Equity for the years ended

31, 2024, 2023 and 2022 70

December 31, 2025, 2024 and 2023 70

(g) Notes to Consolidated Financial Statements 71 - 115

3 unchanged sentences

(incorporated by reference from Exhibit 2.1 to ONEOK, Inc.’s Current Report on Form 8-K, filed May 15, 2023 (File No.

2.1 Purchase Agreement, dated as of Aug.

28, 2024, by and among ONEOK, Inc., GIP III Stetson I, L.P., GIP III Stetson II, L.P.

and EnLink Midstream Manager, LLC (incorporated by reference from Exhibit 2.1 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug.

30, 2024 (File No.

2.2 Purchase and Sale Agreement, dated as of Aug.

28, 2024, by and among ONEOK, Inc., GIP III Trophy GP 2, LLC, GIP III Trophy Acquisition Partners, L.P.

2.1 Purchase Agreement, dated as of Aug ust 28, 2024, by and among ONEOK, Inc., GIP III Stetson I, L.P., GIP III Stetson II, L.P.

and EnLink Midstream Manager, LLC (incorporated by reference from Exhibit 2.1 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug ust 30, 2024 (File No.

2.2 Purchase and Sale Agreement, dated as of Aug ust 28, 2024, by and among ONEOK, Inc., GIP III Trophy GP 2, LLC, GIP III Trophy Acquisition Partners, L.P.

and Medallion Management, L.P.

(incorporated by reference from Exhibit 2.2 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug.

30, 2024 (File No.

2.3 Agreement and Plan of Merger, d ate d as of No v.

24, 202 4 , by and among ONEOK, I nc., Elk Merger Sub I, L.L.C., Elk Merger Sub II, L.L.C., En Link Midstream LLC and EnLink Midstream Manager, LLC (incorporated by reference from Exhibit 2.1 to O NEOK Inc.

’ s Curre n t Report on Form 8-K , filed Nov.

25, 2024 (File No.

3 Amended and Restated Certificate of Incorporation of ONEOK, Inc., dated July 3, 2017, as amended (incorporated by reference from Exhibit 3.2 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended Sept .

30, 2017, filed Nov .

1, 2017 (File No.

(incorporated by reference from Exhibit 2.2 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug ust 30, 2024 (File No.

2.3 Agreement and Plan of Merger, dated as of Nov ember 24, 2024, by and among ONEOK, Inc., Elk Merger Sub I, L.L.C., Elk Merger Sub II, L.L.C., EnLink Midstream LLC and EnLink Midstream Manager, LLC (incorporated by reference from Exhibit 2.1 to ONEOK Inc.’s Current Report on Form 8-K, filed Nov ember 25, 2024 (File No.

3 Amended and Restated Certificate of Incorporation of ONEOK, Inc., dated April 28 , 2025 , as amended (incorporated by reference from Exhibit 3.

1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 3 1 , 2025 , filed April 30 , 2025 (File No.

3.1 Amended and Restated By-laws of ONEOK, Inc.

(incorporated by reference from Exhibit 3.1 to ONEOK Inc.’s Current Report on Form 8-K filed Feb .

24, 2023 (File No.

(incorporated by reference from Exhibit 3.1 to ONEOK Inc.’s Current Report on Form 8-K filed Feb ruary 24, 2023 (File No.

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3.2 Certificate of Designation for Convertible Preferred Stock of WAI, Inc.

(now ONEOK, Inc.) filed Nov .

21, 2008 (incorporated by reference from Exhibit 3.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012, filed Aug .

1, 2012 (File No.

(now ONEOK, Inc.) filed Nov ember 21, 2008 (incorporated by reference from Exhibit 3.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012, filed Aug ust 1, 2012 (File No.

3.3 Certificate of Designation for Series C Participating Preferred Stock of ONEOK, Inc.

21, 2008 (incorporated by reference from Exhibit No.

3.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012, filed Aug .

1, 2012 (File No.

filed Nov ember 21, 2008 (incorporated by reference from Exhibit No.

3.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012, filed Aug ust 1, 2012 (File No.

3.4 Certificate of Designation, Preferences and Rights of Series E Non-Voting Perpetual Preferred Stock of ONEOK, Inc.

1 unchanged sentence

3.1 to ONEOK, Inc.’s Current Report on Form 8-K filed April 20, 2017 (File No.

4 Form of Common Stock Certificate (incorporated by reference from Exhibit 1 to ONEOK, Inc.’s Registration Statement on Form 8-A filed Nov.

21, 1997 (File No.

4.1 Second Supplemental Indenture, dated as of Sept.

25, 1998, between ONEOK, Inc.

and Chase Bank of Texas, as trustee, with respect to the 6.875% Debentures due 2028 (incorporated by reference from Exhibit 5(b) to ONEOK, Inc.’s Current Report on Form 8-K/A filed Oct.

2, 1998 (File No.

4 Form of Common Stock Certificate (incorporated by reference from Exhibit 1 to ONEOK, Inc.’s Registration Statement on Form 8-A filed Nov ember 21, 1997 (File No.

4.1 Second Supplemental Indenture, dated as of Sept ember 25, 1998, between ONEOK, Inc.

and Chase Bank of Texas, as trustee, with respect to the 6.875% Debentures due 2028 (incorporated by reference from Exhibit 5(b) to ONEOK, Inc.’s Current Report on Form 8-K/A filed Oct ober 2, 1998 (File No.

4.2 Fifth Supplemental Indenture, dated as of June 30, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and The Bank of New York Mellon Trust, as trustee (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K filed July 3, 2017 (File No.

4.3 Sixth Supplemental Indenture, dated as of Sept .

25, 2023, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and The Bank of New York Mellon Trust, as trustee (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K filed Sept .

25, 2023 (File No.

4.4 Indenture, dated as of Dec.

28, 2001, between ONEOK, Inc.

4.3 Sixth Supplemental Indenture, dated as of Sept ember 25, 2023, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and The Bank of New York Mellon Trust, as trustee (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K filed Sept ember 25, 2023 (File No.

4.4 Seventh Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C.

and The Bank of New York Mellon Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.10 to ONEOK, Inc.’s Current Report on Form 8-K filed Feb ruary 5, 2025 (File No.

4.5 Indenture, dated as of Dec ember 28, 2001, between ONEOK, Inc.

and SunTrust Bank, as trustee (incorporated by reference from Exhibit 4.1 to Amendment No.

1 to ONEOK, Inc.’s Registration Statement on Form S-3 filed Dec.

28, 2001 (File No.

1 to ONEOK, Inc.’s Registration Statement on Form S-3 filed Dec ember 28, 2001 (File No.

4.6 Third Supplemental Indenture, dated as of June 17, 2005, between ONEOK, Inc.

2 unchanged sentences

Bank National Association, as trustee, with respect to the 6.00% Senior Notes due 2035 (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K filed July 3, 2017 (File No.

4.7 Fifth Supplemental Indenture, dated as of July 13, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 4.95% Senior Notes due 2047 (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K filed July 13, 2017 (File No.

4.8 Indenture, dated as of Jan.

26, 2012, among ONEOK, Inc.

Bank National Association, as trustee (incorporated by reference to Exhibit 4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed Jan.

26, 2012 (File No.

4.8 Sixth Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C.

Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.13 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

Table of C ontents

4.9 Indenture, dated as of Sept ember 25, 2006, between ONEOK Partners, L.P.

and Wells Fargo Bank, N.A., as trustee (incorporated by reference to Exhibit 4.1 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Sept ember 26, 2006 (File No.

4.10 Third Supplemental Indenture, dated as of Sept ember 25, 2006, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.65% Senior Notes due 2036 (incorporated by reference to Exhibit 4.4 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Sept ember 26, 2006 (File No.

4.11 Fourth Supplemental Indenture, dated as of Sept em ber 28, 2007, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.85% Senior Notes due 2037 (incorporated by reference to Exhibit 4.2 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Sept ember 28, 2007 (File No.

4.12 Seventh Supplemental Indenture, dated as of Jan uary 26, 2011, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.125% Senior Notes due 2041 (incorporated by reference from Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Jan uary 26, 2011 (File No.

4.13 Twelfth Supplemental Indenture, dated as of Sept ember 12, 2013, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.200% Senior Notes due 2043 (incorporated by reference to Exhibit 4.4 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Sept ember 12, 2013 (File No.

4.14 Fourteenth Supplemental Indenture, dated as of March 20, 2015, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 4.90% Senior Notes due 2025 (incorporated by reference to Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed on March 20, 2015 (File No.

4.15 Fifteenth Supplemental Indenture, dated as of June 30, 2017, by and among ONEOK Partners, L.P., ONEOK, Inc., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee (incorporated by reference from Exhibit 4.1 to ONEOK, Partners, L.P.’s Current Report on Form 8-K filed July 3, 2017 (File No.

4.16 Sixteenth Supplemental Indenture, dated as of Sept ember 25, 2023, among ONEOK Partners, L.P., ONEOK, Inc., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference from Exhibit 4.4 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 25, 2023 (File No.

4.17 Seventeenth Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, ONEOK, Inc., Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.15 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.18 Indenture, dated as of Jan uary 26, 2012, among ONEOK, Inc.

Bank National Association, as trustee (incorporated by reference to Exhibit 4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed Jan uary 26, 2012 (File No.

4.19 Third Supplemental Indenture, dated as of June 30, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K filed July 3, 2017 (File No.

Bank National Association, as trustee (incorporated by reference from Exhibit 4.2 of ONEOK, Inc.’s Current Report on Form 8-K filed July 3, 2017 (File No.

Table of C ontents

4.20 Fourth Supplemental Indenture, dated as of July 13, 2017, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

12 unchanged sentences

4.25 Ninth Supplemental Indenture, dated March 13, 2019, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 5.20% Senior Notes due 2048 (incorporated by reference from Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed March 13, 2019 (File No.

4.16 Tenth Supplemental Indenture, dated as of Aug.

15, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 2.75% Senior Notes due 2024 (incorporated by reference from Exhibit No.

4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed Aug.

15, 2019 (File No.

4.17 Eleventh Supplemental Indenture, dated as of Aug.

15, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

4.26 Eleventh Supplemental Indenture, dated as of Aug ust 15, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 3.40% Senior Notes due 2029 (incorporated by reference from Exhibit No.

4.2 to ONEOK, Inc.’s Current Report on Form 8-K filed Aug.

15, 2019 (File No.

4.18 Twelfth Supplemental Indenture, dated as of Aug.

15, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

4.2 to ONEOK, Inc.’s Current Report on Form 8-K filed August 15, 2019 (File No.

4.27 Twelfth Supplemental Indenture, dated as of Aug ust 15, 2019, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 4.45% Senior Notes due 2049 (incorporated by reference from Exhibit No.

4.3 to ONEOK, Inc.’s Current Report on Form 8-K filed Aug.

4.3 to ONEOK, Inc.’s Current Report on Form 8-K filed Aug us t .

15, 2019 (File No.

4.19 Thirteenth Supplemental Indenture, dated as of March 10, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 2.200% Senior Notes due 2025 (incorporated by reference from Exhibit No.

4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed March 10, 2020 (File No.

4.28 Fourteenth Supplemental Indenture, dated as of March 10, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

7 unchanged sentences

4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed May 7, 2020 (File No.

Table of C ontents

4.31 Seventeenth Supplemental Indenture, dated as of May 7, 2020, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

4 unchanged sentences

4.3 to ONEOK, Inc.’s Current Report on Form 8-K filed May 7, 2020 (File No.

4.25 Nineteenth Supplemental Indenture, dated as of Nov.

18, 2022, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

4.33 Nineteenth Supplemental Indenture, dated as of Nov ember 18, 2022, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank Trust Company, National Association (successor in interest to U.S.

Bank National Association), as trustee, with respect to the 6.100% Senior Notes due 2032 (incorporated by reference from Exhibit No.

4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed Nov.

18, 2022 (File No.

4.26 Twentieth Supplemental Indenture, dated as of Aug.

24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 5.550% Senior Notes due 2026 (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug.

25, 2023 (File No.

4.27 Twenty-First Supplemental Indenture, dated as of Aug.

24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 5.650% Senior Notes due 2028 (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug.

25, 2023 (File No.

4.28 Twenty-Second Supplemental Indenture, dated as of Aug.

24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 5.800% Senior Notes due 2030 (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug.

25, 2023 (File No.

4.29 Twenty-Third Supplemental Indenture, dated as of Aug.

24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 6.050% Senior Notes due 2033 (incorporated by reference from Exhibit 4.4 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug.

25, 2023 (File No.

4.30 Twenty-Fourth Supplemental Indenture, dated as of Aug.

24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 6.625% Senior Notes due 2053 (incorporated by reference from Exhibit 4.5 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug.

25, 2023 (File No.

4.31 Twenty-Fifth Supplemental Indenture, dated as of Sept.

25, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

25, 2023 (File No.

4.32 Twenty-Sixth Supplemental Indenture, dated as of Sept.

24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 4.250% Notes due 2027 (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

24, 2024 (File No.

4.33 Twenty-Seventh Supplemental Indenture, dated as of Sept.

24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 4.400% Notes due 2029 (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

24, 2024 (File No.

4.34 Twenty-Eighth Supplemental Indenture, dated as of Sept.

24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 4.750% Notes due 2031 (incorporated by reference from Exhibit 4.4 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

24, 2024 (File No.

4.35 Twenty-Ninth Supplemental Indenture, dated as of Sept.

24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 5.050% Notes due 2034 (incorporated by reference from Exhibit 4.5 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

24, 2024 (File No.

4.36 Thirtieth Supplemental Indenture, dated as of Sept.

24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 5.700% Notes due 2054 (incorporated by reference from Exhibit 4.6 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

24, 2024 (File No.

4.37 Thirty-First Supplemental Indenture, dated as of Sept.

24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 5.850% Notes due 2064 (incorporated by reference from Exhibit 4.7 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

24, 2024 (File No.

4.38 Indenture, dated as of Sept.

25, 2006, between ONEOK Partners, L.P.

and Wells Fargo Bank, N.A., as trustee (incorporated by reference to Exhibit 4.1 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Sept.

26, 2006 (File No.

4.39 Third Supplemental Indenture, dated as of Sept.

25, 2006, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.65% Senior Notes due 2036 (incorporated by reference to Exhibit 4.4 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Sept.

26, 2006 (File No.

4.40 Fourth Supplemental Indenture, dated as of Sept.

28, 2007, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.85% Senior Notes due 2037 (incorporated by reference to Exhibit 4.2 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Sept.

28, 2007 (File No.

4.41 Seventh Supplemental Indenture, dated as of Jan.

26, 2011, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.125% Senior Notes due 2041 (incorporated by reference from Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Jan.

26, 2011 (File No.

4.42 Twelfth Supplemental Indenture, dated as of Sept.

12, 2013, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 6.200% Senior Notes due 2043 (incorporated by reference to Exhibit 4.4 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed Sept.

12, 2013 (File No.

4.43 Fourteenth Supplemental Indenture, dated as of March 20, 2015, among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee, with respect to the 4.90% Senior Notes due 2025 (incorporated by reference to Exhibit 4.3 to ONEOK Partners, L.P.’s Current Report on Form 8-K filed on March 20, 2015 (File No.

4.44 Fifteenth Supplemental Indenture, dated as of June 30, 2017, by and among ONEOK Partners, L.P., ONEOK, Inc., ONEOK Partners Intermediate Limited Partnership and Wells Fargo Bank, N.A., as trustee (incorporated by reference from Exhibit 4.1 to ONEOK, Partners, L.P.’s Current Report on Form 8-K filed July 3, 2017 (File No.

4.45 Sixteenth Supplemental Indenture, dated as of Sept.

25, 2023, among ONEOK Partners, L.P., ONEOK, Inc., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference from Exhibit 4.4 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

25, 2023 (File No.

4.1 to ONEOK, Inc.’s Current Report on Form 8-K filed Nov ember 18, 2022 (File No.

4.34 Twentieth Supplemental Indenture, dated as of Aug ust 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 5.550% Senior Notes due 2026 (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug ust 25, 2023 (File No.

4.35 Twenty-First Supplemental Indenture, dated as of Aug ust 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 5.650% Senior Notes due 2028 (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug ust 25, 2023 (File No.

4.36 Twenty-Second Supplemental Indenture, dated as of Aug ust 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 5.800% Senior Notes due 2030 (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug ust 25, 2023 (File No.

4.37 Twenty-Third Supplemental Indenture, dated as of Aug ust 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 6.050% Senior Notes due 2033 (incorporated by reference from Exhibit 4.4 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug ust 25, 2023 (File No.

4.38 Twenty-Fourth Supplemental Indenture, dated as of Aug ust 24, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank National Association, as trustee, with respect to the 6.625% Senior Notes due 2053 (incorporated by reference from Exhibit 4.5 to ONEOK Inc.’s Current Report on Form 8-K, filed Aug ust 25, 2023 (File No.

4.39 Twenty-Fifth Supplemental Indenture, dated as of Sept ember 25, 2023, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 25, 2023 (File No.

4.40 Twenty-Sixth Supplemental Indenture, dated as of Sept ember 24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 4.250% Notes due 2027 (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 24, 2024 (File No.

Table of C ontents

4.41 Twenty-Seventh Supplemental Indenture, dated as of Sept ember 24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 4.400% Notes due 2029 (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 24, 2024 (File No.

4.42 Twenty-Eighth Supplemental Indenture, dated as of Sept ember 24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 4.750% Notes due 2031 (incorporated by reference from Exhibit 4.4 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 24, 2024 (File No.

4.43 Twenty-Ninth Supplemental Indenture, dated as of Sept ember 24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 5.050% Notes due 2034 (incorporated by reference from Exhibit 4.5 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 24, 2024 (File No.

4.44 Thirtieth Supplemental Indenture, dated as of Sep t ember 24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 5.700% Notes due 2054 (incorporated by reference from Exhibit 4.6 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 24, 2024 (File No.

4.45 Thirty-First Supplemental Indenture, dated as of Sept ember 24, 2024, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to 5.850% Notes due 2064 (incorporated by reference from Exhibit 4.7 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 24, 2024 (File No.

4.46 Thirty-Second Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C.

Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.14 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.47 Thirty-Third Supplemental Indenture, dated as of August 12, 2025, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP and U.S.

Bank National Association, as trustee, with respect to 4.950% Notes due 2032 (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K filed August 13, 2025 (File No.

4.48 Thirty-Fourth Supplemental Indenture, dated as of August 12, 2025, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP and U.S.

Bank National Association, as trustee, with respect to 5.400% Notes due 2035 (incorporated by reference from Exhibit 4.3 to ONEOK Inc.’s Current Report on Form 8-K filed August 13, 2025 (File No.

4.49 Thirty-Fifth Supplemental Indenture, dated as of August 12, 2025, among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP and U.S.

Bank National Association, as trustee, with respect to 6.250% Notes due 2055 (incorporated by reference from Exhibit 4.4 to ONEOK Inc.’s Current Report on Form 8-K filed August 13, 2025 (File No.

4.50 Indenture, dated as of April 19, 2007, between Magellan Midstream Partners, L.P.

Bank National Association, as trustee (incorporated by reference from Exhibit 4.1 to Magellan Midstream Partners, L.P.’s Form 8-K, filed April 20, 2007 (File No.

Table of C ontents

4.51 First Supplemental Indenture, dated as of April 19, 2007, between Magellan Midstream Partners, L.P.

Bank National Association, as trustee, with respect to the 6.400% Senior Notes due 2037 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Form 8-K, filed April 20, 2007 (File No.

4.48 Second Supplemental Indenture, dated as of Sept.

25, 2023, among Magellan Midstream Partners, L.P., ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.5 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

25, 2023 (File No.

4.49 Third Supplemental Indenture, dated as of Dec.

13, 2023, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K filed Dec.

14, 2023 (File No.

4.50 Indenture, dated as of Aug.

11, 2010, between Magellan Midstream Partners, L.P.

Bank National Association, as trustee (incorporated by reference from Exhibit 4.1 to Midstream Partners, L.P.’s Form 8-K, filed Aug.

16, 2010 (File No.

4.51 Second Supplemental Indenture, dated as of Nov.

9, 2012, between ONEOK, Inc.

4.52 Second Supplemental Indenture, dated as of Sept ember 25, 2023, among Magellan Midstream Partners, L.P., ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.5 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 25, 2023 (File No.

4.53 Third Supplemental Indenture, dated as of Dec ember 13, 2023, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.1 to ONEOK Inc.’s Current Report on Form 8-K filed Dec ember 14, 2023 (File No.

4.54 Fourth Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., and U.S.

Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.12 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.55 Indenture, dated as of Aug ust 11, 2010, between Magellan Midstream Partners, L.P.

Bank National Association, as trustee (incorporated by reference from Exhibit 4.1 to Midstream Partners, L.P.’s Form 8-K, filed Aug ust 16, 2010 (File No.

4.56 Second Supplemental Indenture, dated as of Nov ember 9, 2012, between ONEOK, Inc.

(successor in interest to Magellan Midstream Partners, L.P.), and U.S.

Bank National Association, as trustee, with respect to the 4.200% Senior Notes due 2042 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed Nov.

9, 2012 (File No.

4.52 Third Supplemental Indenture, dated as of Oct.

4.57 Third Supplemental Indenture, dated as of Oct ober .

10, 2013, between ONEOK, Inc.

(successor in interest to Magellan Midstream Partners, L.P.), and U.S.

Bank National Association, as trustee, with respect to the 5.15% Senior Notes due 2043 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed Oct.

10, 2013 (File No.

4.53 Fourth Supplemental Indenture, dated as of March 4, 2015, between ONEOK, Inc.

(successor in interest to Magellan Midstream Partners, L.P.), and U.S.

Bank National Association, as trustee, with respect to the 3.20% Senior Notes due 2025 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed March 4, 2015 (File No.

4.58 Fifth Supplemental Indenture, dated as of March 4, 2015, between ONEOK, Inc.

1 unchanged sentence

Bank National Association, as trustee, with respect to the 4.20% Senior Notes due 2045 (incorporated by reference from Exhibit 4.3 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed March 4, 2015 (File No.

4.55 Sixth Supplemental Indenture, dated as of Feb.

29, 2016, between ONEOK, Inc.

4.59 Sixth Supplemental Indenture, dated as of Feb ruary 29, 2016, between ONEOK, Inc.

(successor in interest to Magellan Midstream Partners, L.P.), and U.S.

Bank National Association, as trustee, with respect to the 5.00% Senior Notes due 2026 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed Feb.

29, 2016 (File No.

4.56 Seventh Supplemental Indenture, dated as of Sept.

13, 2016, between ONEOK, Inc.

4.60 Seventh Supplemental Indenture, dated as of Sept ember 13, 2016, between ONEOK, Inc.

(successor in interest to Magellan Midstream Partners, L.P.), and U.S.

Bank National Association, as trustee, with respect to the 4.25% Senior Notes due 2046 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed Sept.

13, 2016 (File No.

4.57 Eighth Supplemental Indenture, dated as of Oct.

3, 2017, between ONEOK, Inc.

4.61 Eighth Supplemental Indenture, dated as of Oct ober 3, 2017, between ONEOK, Inc.

(successor in interest to Magellan Midstream Partners, L.P.), and U.S.

Bank National Association, as trustee, with respect to the 4.200% Senior Notes due 2047 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed Oct.

3, 2017 (File No.

4.58 Ninth Supplemental Indenture, dated as of Jan.

18, 2019, between ONEOK, Inc.

Table of C ontents

4.62 Ninth Supplemental Indenture, dated as of Jan uary 18, 2019, between ONEOK, Inc.

(successor in interest to Magellan Midstream Partners, L.P.), and U.S.

Bank National Association, as trustee, with respect to the 4.850% Senior Notes due 2049 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed Jan.

18, 2019 (File No.

4.59 Tenth Supplemental Indenture, dated as of Aug.

19, 2019, between ONEOK, Inc.

4.63 Tenth Supplemental Indenture, dated as of Aug ust 19, 2019, between ONEOK, Inc.

(successor in interest to Magellan Midstream Partners, L.P.), and U.S.

Bank National Association, as trustee, with respect to the 3.950% Senior Notes due 2050 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed Aug.

19, 2019 (File No.

4.64 Eleventh Supplemental Indenture, dated as of May 20, 2020, between ONEOK, Inc.

1 unchanged sentence

Bank National Association, as trustee, with respect to the 3.250% Senior Notes due 2030 (incorporated by reference from Exhibit 4.2 to Magellan Midstream Partners, L.P.’s Current Report on Form 8-K, filed May 20, 2020 (File No.

4.61 Twelfth Supplemental Indenture, dated as of Sept.

25, 2023, among Magellan Midstream Partners, L.P., ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.6 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept.

25, 2023 (File No.

4.62 Thirteenth Supplemental Indenture, dated as of Dec.

13, 2023, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank Trust Company, National Association, as trustee, (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K filed Dec.

14, 2023 (File No.

4.65 Twelfth Supplemental Indenture, dated as of Sept ember 25, 2023, among Magellan Midstream Partners, L.P., ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership and U.S.

Bank Trust Company, National Association, as trustee (incorporated by reference from Exhibit 4.6 to ONEOK Inc.’s Current Report on Form 8-K, filed Sept ember 25, 2023 (File No.

4.66 Thirteenth Supplemental Indenture, dated as of Dec ember 13, 2023, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

Bank Trust Company, National Association, as trustee, (incorporated by reference from Exhibit 4.2 to ONEOK Inc.’s Current Report on Form 8-K filed Dec ember 14, 2023 (File No.

4.67 Fourteenth Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., and U.S.

Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.11 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.68 Indenture, dated as of March 19, 2014, by and between EnLink Midstream Partners, LP and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream Partners, LP’s Current Report on Form 8-K, filed March 21, 2014 (File No.

4.69 First Supplemental Indenture, dated as of March 19, 2014, by and between EnLink Midstream Partners, LP and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.3 to EnLink Midstream Partners, LP’s Current Report on Form 8-K, filed March 21, 2014 (File No.

4.65 Second Supplemental Indenture, dated as of Nov .

12, 2014, by and between EnLink Midstream Partners, LP and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.3 to EnLink Midstream Partners, LP’s Current Report on Form 8-K, filed Nov.

12, 2014 (File No.

4.66 Third Supplemental Indenture, dated as of May 12, 2015, by and between EnLink Midstream Partners, LP and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.3 to EnLink Midstream Partners, LP’s Current Report on Form 8-K, filed May 12, 2015 (File No.

4.70 Second Supplemental Indenture, dated as of Nov ember 12, 2014, by and between EnLink Midstream Partners, LP and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.3 to EnLink Midstream Partners, LP’s Current Report on Form 8-K, filed Nov ember 12, 2014 (File No.

4.71 Fourth Supplemental Indenture, dated as of July 14, 2016, by and between EnLink Midstream Partners, LP and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream Partners, LP’s Current Report on Form 8-K, filed July 14, 2016 (File No.

4.72 Fifth Supplemental Indenture, dated as of May 11, 2017, by and between EnLink Midstream Partners, LP and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream Partners, LP’s Current Report on Form 8-K, filed May 11, 2017 (File No.

Table of C ontents

4.73 Sixth Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.9 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.74 Indenture, dated as of April 9, 2019, by and between EnLink Midstream, LLC and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed April 9, 2019 (File No.

4.75 First Supplemental Indenture, dated as of April 9, 2019, by and among EnLink Midstream, LLC, EnLink Midstream Partners, LP, and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed April 9, 2019 (File No.

4.71 Indenture, dated as of Dec.

17, 2020, by and among EnLink Midstream, LLC, as issuer, EnLink Midstream Partners, LP, as guarantor, and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Dec.

18, 2020 (File No.

4.72 Indenture, dated as of Aug.

31, 2022, by and among EnLink Midstream, LLC, as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed on Aug.

31, 2022 (File No.

4.73 Indenture, dated as of Aug.

15, 2024, by and among EnLink Midstream, LLC, as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Aug.

15, 2024 (File No.

4.74 First Supplemental Indenture, dated as of Aug.

15, 2024, by and among EnLink Midstream, LLC, as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Aug.

15, 2024 (File No.

4.75 First Supplemental Indenture, dated as of Jan .

31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Jan .

31, 2025, File No.

4.76 Second Supplemental Indenture, dated as of Jan .

31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Jan .

31, 2025, File No.

4.77 First Supplemental Indenture, dated as of Jan .

31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.3 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Jan .

31, 2025, File No.

4.78 Second Supplemental Indenture, dated as of Jan .

31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.4 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Jan .

31, 2025, File No.

4.79 Third Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.5 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.80 Second Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.6 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.81 Second Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.7 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.82 Third Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.8 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.83 Sixth Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.9 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.84 Seventh Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C.

and The Bank of New York Mellon Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.10 to ONEOK, Inc.’s Current Report on Form 8-K filed Feb .

5, 2025 (File No.

4.85 Fourteenth Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., and U.S.

Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.11 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.86 Fourth Supplemental Indenture, dated as of Jan .

Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.12 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.87 Sixth Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C.

Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.13 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.88 Thirty-Second Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK, Inc., ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C.

Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.14 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.89 Seventeenth Supplemental Indenture, dated as of Jan .

31, 2025, by and among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, ONEOK, Inc., Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, Elk Merger Sub II, L.L.C., and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.15 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

5, 2025 (File No.

4.90 Description of securities (incorporated by reference from Exhibit 4.43 to ONEOK, Inc.'s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2020, filed Feb.

23, 2021 (File No.

10 ONEOK, Inc.

Long-Term Incentive Plan (incorporated by reference from Exhibit 10(a) to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2001, filed March 14, 2002 (File No.

10.1 ONEOK, Inc.

Stock Compensation Plan for Non-Employee Directors (incorporated by reference from Exhibit 99 to ONEOK, Inc.’s Registration Statement on Form S-8 filed Jan.

25, 2001 (File No.

10.2 ONEOK, Inc.

Supplemental Executive Retirement Plan terminated and frozen Dec.

31, 2004 (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed Dec.

20, 2004 (File No.

10.3 ONEOK, Inc.

2005 Supplemental Executive Retirement Plan, as amended and restated, dated as of Dec.

18, 2008 (incorporated by reference from Exhibit 10.3 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2008, filed Feb.

25, 2009 (File No.

4.76 Second Supplemental Indenture, dated as of January 31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed January 31, 2025, File No.

4.77 Third Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.5 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.78 Indenture, dated as of Dec ember 17, 2020, by and among EnLink Midstream, LLC, as issuer, EnLink Midstream Partners, LP, as guarantor, and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Dec ember 18, 2020 (File No.

4.79 First Supplemental Indenture, dated as of Jan uary 31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Jan uary 31, 2025, File No.

4.80 Second Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.6 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.81 Indenture, dated as of Aug ust 31, 2022, by and among EnLink Midstream, LLC, as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed on Aug ust 31, 2022 (File No.

4.82 First Supplemental Indenture, dated as of Jan uary 31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.3 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Jan uary 31, 2025, File No.

Table of C ontents

4.83 Second Supplemental Indenture, dated as of Jan uary 31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.7 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.84 Indenture, dated as of Aug ust 15, 2024, by and among EnLink Midstream, LLC, as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.1 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Aug ust 15, 2024 (File No.

4.85 First Supplemental Indenture, dated as of August 15, 2024, by and among EnLink Midstream, LLC, as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.2 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Aug ust 15, 2024 (File No.

4.86 Second Supplemental Indenture, dated as of January 31, 2025, by and among Elk Merger Sub II, L.L.C., as issuer, EnLink Midstream Partners, LP, as guarantor, and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.4 to EnLink Midstream, LLC’s Current Report on Form 8-K, filed Jan uary 31, 2025, File No.

4.87 Third Supplemental Indenture, dated as of January 31, 2025, by and among ONEOK, Inc., Elk Merger Sub II, L.L.C., EnLink Midstream Partners, LP, ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P.

and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 4.8 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 5, 2025 (File No.

4.88 Description of securities .

2005 Supplemental Executive Retirement Plan, as amended and restated, dated as of December 18, 2008 (incorporated by reference from Exhibit 10.3 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009 (File No.

10.1 Form of Indemnification Agreement between ONEOK, Inc.

and ONEOK, Inc.

officers and directors, as amended (incorporated by reference from Exhibit 10.5 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2014, filed Feb.

25, 2015 (File No.

10.5 Amended and Restated ONEOK, Inc.

Annual Officer Incentive Plan (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed May 27, 2009 (File No.

officers and directors, as amended (incorporated by reference from Exhibit 10.5 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2014, filed February 25, 2015 (File No.

10.2 ONEOK, Inc.

Employee Nonqualified Deferred Compensation Plan, as amended and restated Dec.

16, 2004 (incorporated by reference from Exhibit 10.3 to ONEOK, Inc.’s Current Report on Form 8-K filed Dec.

20, 2004 (File No.

Supplemental Executive Retirement Plan terminated and frozen December 31, 2004 (incorporated by reference from Exhibit 10.1 to ONEOK, Inc ’ s Current Report on Form 8-K filed December 20, 2004 (File No.

1- 13643 )) .

10.3 ONEOK, Inc.

2005 Nonqualified Deferred Compensation Plan, as amended and restated, dated as of Dec.

18, 2008 (incorporated by reference from Exhibit 10.8 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2008, filed Feb.

25, 2009 (File No.

Employee Nonqualified Deferred Compensation Plan, as amended and restated December 16, 2004 (incorporated by reference from Exhibit 10.3 to ONEOK, Inc.’s Current Report on Form 8-K filed December 20, 2004 (File No.

10.4 ONEOK, Inc.

Deferred Compensation Plan for Non-Employee Directors, as amended and restated, dated as of Dec.

18, 2008 (incorporated by reference from Exhibit 10.9 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2008, filed Feb.

25, 2009 (File No.

2005 Nonqualified Deferred Compensation Plan, as amended and restated, dated as of December 18, 2008 (incorporated by reference from Exhibit 10.8 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009 (File No.

10.5 ONEOK, Inc.

Deferred Compensation Plan for Non-Employee Directors, as amended and restated May 22, 2024 .

10.6 Amended and Restated Limited Liability Company Agreement of Overland Pass Pipeline Company LLC entered into between ONEOK Overland Pass Holdings, L.L.C.

and Williams Field Services Company, LLC, dated as of May 31, 2006 (incorporated by reference to Exhibit 10.6 to ONEOK Partners, L.P.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2006, filed Aug.

4, 2006 (File No.

10.10 Form of ONEOK, Inc.

Officer Change in Control Severance Plan (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed July 22, 2011 (File No.

10.11 Form of 2023 Restricted Unit Stock Award Agreement, dated as of Feb.

22, 2023 (incorporated by reference from Exhibit 10.15 to ONEOK, Inc.’s Annual Report on Form 10-K, filed Feb.

28, 2023 (File No.

10.12 Form of 2023 Performance Unit Award Agreement, dated as of Feb.

22, 2023 (incorporated by reference from Exhibit 10.16 to ONEOK, Inc.’s Annual Report on Form 10-K, filed Feb.

28, 2023 (File No.

10.13 Form of 2022 Restricted Unit Award Agreement (incorporated by reference from Exhibit 10.17 to ONEOK, Inc.’s Annual Report on Form 10-K, filed March 1, 2022 (File No.

10.14 Form of 2022 Performance Unit Award Agreement (incorporated by reference from Exhibit 10.18 to ONEOK, Inc.’s Annual Report on Form 10-K, filed March 1, 2022 (File No.

Table of C ontents

10.7 ONEOK, Inc.

Officer Change in Control Severance Plan (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed July 22, 2011 (File No.

10.8 Form of 2023 Restricted Unit Stock Award Agreement, dated as of February 22, 2023 (incorporated by reference from Exhibit 10.15 to ONEOK, Inc.’s Annual Report on Form 10-K, filed February 28, 2023 (File No.

10.9 Form of 2023 Performance Unit Award Agreement, dated as of February 22, 2023 (incorporated by reference from Exhibit 10.16 to ONEOK, Inc.’s Annual Report on Form 10-K, filed February 28, 2023 (File No.

Equity Incentive Plan (incorporated by reference to Appendix A to ONEOK, Inc.’s definitive proxy statement on Schedule 14A filed on April 5, 2018 (File No.

10.11 ONEOK, Inc.

Profit Sharing Plan, dated as of Jan.

1, 2005 (incorporated by reference from Exhibit 99 to ONEOK, Inc.’s Registration Statement on Form S-8 filed Dec.

30, 2004 (File No.

333-121769)).

10.17 ONEOK, Inc.

Equity Compensation Plan, as amended and restated, dated as of Dec.

18, 2008 (incorporated by reference from Exhibit 10.44 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2008, filed Feb.

25, 2009 (File No.

10.18 Equity Distribution Agreement, dated as of Aug.

3, 2023, among ONEOK, Inc., and BofA Securities, Inc., as sales agent, principals and/or forward sellers, as forward purchasers (incorporated by reference from Exhibit 1.1 to ONEOK, Inc.’s Current Report on Form 8-K with a filed Aug.

3, 2023 (File No.

10.19 Form of 2024 Restricted Unit Award Agreement, dated as of Feb.

27, 2024 (incorporated by reference from Exhibit 10.24 to ONEOK, Inc.'s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2023, filed Feb.

27, 2024 (File No.

10.20 Form of 2024 Performance Unit Award Agreement, dated as of Feb.

27, 2024 (incorporated by reference from Exhibit 10.25 to ONEOK, Inc.'s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2023, filed Feb.

27, 2024 (File No.

10.21 Form of 2021 Restricted Unit Award Agreement (incorporated by reference from Exhibit 10.33 to ONEOK, Inc.'s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2020, filed Feb.

23, 2021 (File No.

10.22 Form of 2021 Performance Unit Award Agreement (incorporated by reference from Exhibit 10.34 to ONEOK, Inc's Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2020, filed Feb.

23, 2021 (File No.

Equity Compensation Plan, as amended and restated, dated as of December 18, 2008 (incorporated by reference from Exhibit 10.44 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2008, filed February 25, 2009 (File No.

10.12 Equity Distribution Agreement, dated as of August 3, 2023, among ONEOK, Inc., and BofA Securities, Inc., as sales agent, principals and/or forward sellers, as forward purchasers (incorporated by reference from Exhibit 1.1 to ONEOK, Inc.’s Current Report on Form 8-K with a filed August 3, 2023 (File No.

10.13 Form of 2024 Restricted Unit Award Agreement, dated as of February 2 1 , 2024 (incorporated by reference from Exhibit 10.24 to ONEOK, Inc.'s Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed February 27, 2024 (File No.

10.14 Form of 2024 Performance Unit Award Agreement, dated as of February 2 1 , 2024 (incorporated by reference from Exhibit 10.25 to ONEOK, Inc.'s Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed February 27, 2024 (File No.

10.15 ONEOK, Inc., 2025 Equity Incentive Plan, effective as of May 21, 2025 (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K filed May 22, 2025 (File No.

10.16 Form of 2025 Restricted Unit Award Agreement, dated as of Feb.

19, 2025 (i ncorporated by reference from Exhibit 10.23 to ONEOK, Inc .

’ s Annual Report on Form 10-K for the fisca l year ended December 31, 2024, filed February 25, 2025 ( File No.

10.17 Form of 2025 Performance Unit Award Agreement, dated as of Feb.

10.25 ONEOK, Inc.

Employee Stock Purchase Plan as amended and restated effective May 24, 2023 (incorporated by reference to Exhibit 99.1 to ONEOK, Inc.’s Registration Statement on Form S-8, filed Nov.

9, 2023 (File No.

19, 2025 (incorporated by reference from Exhibit 10.2 4 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed February 25, 2025 (File No.

10.18 Form of 2025 Performance Unit Award Agreement pursuant to the ONEOK, Inc.

2025 Equity Incentive Plan (incorporated by reference from Exhibit 10.3 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2025, filed August 5, 2025 (File No.

10.19 Form of 2025 Restricted Unit Award Agreement pursuant to the ONEOK, Inc.

2025 Equity Incentive Plan (incorporated by reference from Exhibit 10.

4 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2025, filed August 5, 2025 (File No.

10.20 Form of 2026 Restricted Unit Award Agreement.

10.21 Form of 2026 Performance Unit Award Agreement.

Table of C ontents

10.22 ONEOK, Inc.

2020 Nonqualified Deferred Compensation Plan, dated as of July 24, 2019, and effective as of Jan.

1, 2020 (incorporated by reference from Exhibit 10.40 to ONEOK, Inc.’s Annual Report on Form 10-K for the fiscal year ended Dec.

31, 2020, filed Feb.

23, 2021 (File No.

10.27 Form of ONEOK, Inc.

Equity Incentive Plan Restricted Unit Award Agreement (Make-Whole Award) between ONEOK, Inc.

and Pierce H.

Norton II (incorporated by reference to Exhibit 10.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2021, filed Aug.

4, 2021 (File No.

10.28 Form of ONEOK, Inc.

Equity Incentive Plan Restricted Unit Award Agreement (Make-Whole Award) (incorporated by reference to Exhibit 10.1 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended Sept.

30, 2022, filed Nov.

2, 2022 (File No.

10.30 Restricted Unit Award Agreement between ONEOK, Inc.

and Janet Hogan (incorporated by reference to Exhibit 10.3 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended Sept.

30, 2022, filed Nov.

2, 2022 (File No.

2020 Nonqualified Deferred Compensation Plan, as amended and res tated January 1, 202 5 .

10.23 Restricted Unit Award Agreement between ONEOK, Inc.

and Darren Wallis (incorporated by reference to Exhibit 10.4 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended Sept.

30, 2022, filed Nov.

2, 2022 (File No.

10.32 Second Amended and Restated Credit Agreement, dated as of Feb.

14, 2025, by and amount ONEOK, Inc., as borrower, Citibank, N.A., as administrative ag ent, a swing line lender, a letter of credit issuer and a lender, and each of the other lenders, swing line l enders and letter of credit issuers party th ereto (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.

’ s Current Report on Form 8-K, filed Feb.

20, 2025 (File No.

10.33 Second Amended and Restated Guaranty Agreement, dated as of Feb .

14, 2025, by and among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, and Elk Merger Sub II, L.L.C., in favor of Citibank, N.A.

(incorporated by reference from Exhibit 10.2 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb .

20 , 2025 (File No.

10.34 ONEOK, Inc.

Long-Term Incentive Plain, as amended and restated, dated as of Jan.

26, 2021 (f/k/a the Magellan Midstream Partners, L.P., Long-Term Incentive Plan) (incorporated by reference to Magellan Midstream Partners, L.P.’s Exhibit 10(a) to Form 10-K filed April 29, 2021) (File No.

10.35 Amendment No.

1, dated as of April 1, 2021 to ONEOK, Inc.

Long-Term Incentive Plan (f/k/a the Magellan Midstream Partners, L.P.

Long-Term Incentive Plan) (incorporated by reference to Exhibit 10.2 to Magellan Midstream Partners, L.P.’s Form 10-Q filed April 29, 2021) (File No.

10.36 EnLink Midstream, LLC 2014 Long-Term Incentive Plan, as amended and restated, dated Dec .

16, 2021 (incorporated by reference to EnLink Midstream, LLC’s Exhibit 10.3 to Form 10-K, filed Feb .

16, 2022 (File No.

10.37 Support Agreement, dated as of Nov .

24, 2024, by and among ONEOK, Inc.

and EnLink Midstream, LLC (incorporated by reference to Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K, filed Nov .

25, 2024 (File No.

and Darren Wallis (incorporated by reference to Exhibit 10.4 to ONEOK, Inc.’s Quarterly Report on Form 10-Q for the quarter ended Sept ember 30, 2022, filed Nov ember 2, 2022 (File No.

Second Amended and Restated Credit Agreement, dated as of Feb ruary 14, 2025, by and amount ONEOK, Inc., as borrower, Citibank, N.A., as administrative agent, a swing line lender, a letter of credit issuer and a lender, and each of the other lenders, swing line lenders and letter of credit issuers party thereto (incorporated by reference from Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K, filed Feb ruary 20, 2025 (File No.

10.25 Second Amended and Restated Guaranty Agreement, dated as of February 14, 2025, by and among ONEOK Partners, L.P., ONEOK Partners Intermediate Limited Partnership, Magellan Midstream Partners, L.P., EnLink Midstream Partners, LP, and Elk Merger Sub II, L.L.C., in favor of Citibank, N.A.

(incorporated by reference from Exhibit 10.2 to ONEOK, Inc.’s Current Report on Form 8-K, filed February 20, 2025 (File No.

10.26 EnLink Midstream, LLC 2014 Long-Term Incentive Plan, as amended and restated, dated December 16, 2021 (incorporated by reference to EnLink Midstream, LLC’s Exhibit 10.3 to Form 10-K, filed February 16, 2022 (File No.

10.27 Support Agreement, dated as of November 24, 2024, by and among ONEOK, Inc.

and EnLink Midstream, LLC (incorporated by reference to Exhibit 10.1 to ONEOK, Inc.’s Current Report on Form 8-K, filed November 25, 2024 (File No.

10.28 O NEOK, I nc.

Annual Officer Incentive Plan , as amended and restated November 6, 2024.

19 Securities and Insider Trading Policy

16 unchanged sentences

101.CAL Inline XBRL Taxonomy Calculation Linkbase Document.

Table of C ontents

101.DEF Inline XBRL Taxonomy Extension Definitions Document.

2 unchanged sentences

104 Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101).

*Certain annexes, schedules and exhibits have been omitted pursuant to Item 601(a)(5) of Regulation S-K.

ONEOK undertakes to furnish supplemental copies of any of the omitted annexes, schedules and exhibits to the SEC upon its request.

Attached as Exhibit 101 to this Annual Report are the following Inline XBRL-related documents:

(i) Document and Entity Information;

(ii) Consolidated Statements of Income for the years ended Dec.

31, 2024, 2023 and 2022 (iii) Consolidated Statements of Comprehensive Income for the years ended Dec.

31, 2024, 2023 and 2022;

(iv) Consolidated Balance Sheets at Dec.

31, 2024 and 2023;

(v) Consolidated Statements of Cash Flows for the years ended Dec.

31, 2024, 2023 and 2022;

(vi) Consolidated Statements of Changes in Equity for the years ended Dec.

31, 2024, 2023 and 2022 and (vii) Notes to Consolidated Financial Statements.

(ii) Consolidated Statements of Income for the years ended December 31, 2025, 2024 and 2023;

(iii) Consolidated Statements of Comprehensive Income for the years ended December 31, 2025, 2024 and 2023;

(iv) Consolidated Balance Sheets at December 31, 2025 and 2024;

(v) Consolidated Statements of Cash Flows for the years ended December 31, 2025, 2024 and 2023;

(vi) Consolidated Statements of Changes in Equity for the years ended December 31, 2025, 2024 and 2023 and (vii) Notes to Consolidated Financial Statements.

FORM 10-K SUMMARY

Table of C ontents

Pursuant to the requirements of Section 13 or 15(d) of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

18 unchanged sentences

Director Director

/s/ Eduardo A.

/s/ Precious W.

Director Director

Helderman /s/ Gerald B.

Helderman Gerald B.

Helderman /s/ Eduardo A.

Helderman Eduardo A.

Director Director

/s/ Randall J.

Larson /s/ Wayne T.

Larson Wayne T.

Larson /s/ Gerald B.

Larson Gerald B.

Director Director

McCollum Wayne T.

Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.

What changed 10-K

Item 9A. Controls and Procedures