ONEOK INC NEW

ONEOK, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

A. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Our accompanying unaudited Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the SEC. These statements have been prepared in accordance with GAAP and reflect all adjustments that, in our opinion, are necessary for a fair statement of the results for the interim periods presented. All such adjustments are of a normal recurring nature. The 2023 year-end Consolidated Balance Sheet data was derived from our audited Consolidated Financial Statements but does not include all disclosures required by GAAP. These unaudited Consolidated Financial Statements should be read in conjunction with our audited Consolidated Financial Statements in our Annual Report.

Recently Issued Accounting Standards Update - Changes to GAAP are established by the FASB in the form of ASUs to the FASB Accounting Standards Codification. We consider the applicability and impact of all ASUs. There have been no new accounting pronouncements that have become effective or have been issued that are of significance or potential significance to us during the quarter, and no material updates to recently issued standards disclosed in our Annual Report.

B. ACQUISITIONS

Gulf Coast NGL Pipelines Acquisition - In June 2024, we completed the acquisition of a system of NGL pipelines from Easton Energy, a Houston-based midstream company, for approximately $280 million. This acquisition in our Natural Gas Liquids segment includes approximately 450 miles of liquids products pipelines located in the strategic Gulf Coast market centers for NGLs, Refined Products and crude oil. A portion of the Easton assets are already connected to our Mont Belvieu assets. We expect to add connections to our Houston-based assets beginning in mid-2025 through the end of 2025.

Magellan Acquisition - On September 25, 2023, we completed the Magellan Acquisition. The acquisition strategically diversifies our complementary asset base and allows for significant expected synergies as a combined entity. Each common unit of Magellan was exchanged for a fixed ratio of 0.667 shares of ONEOK common stock and $25.00 of cash, for a total consideration of $14.1 billion. A total of approximately 135 million shares of common stock were issued, with a fair value of approximately $9.0 billion as of the closing date of the Magellan Acquisition. We funded the cash portion of the acquisition with an underwritten public offering of $5.25 billion senior unsecured notes. For additional information on our long-term debt, please see Note H in our Annual Report.

The Magellan Acquisition was accounted for using the acquisition method of accounting for business combinations pursuant to Accounting Standards Codification 805, “Business Combinations,” which requires, among other things, assets acquired and liabilities assumed to be recorded at their fair values on the acquisition date. Determining the fair value of acquired assets and liabilities assumed requires management’s judgment and the use of independent valuation specialists. During the six months ended June 30, 2024, we recorded adjustments to the preliminary purchase price allocation that resulted in an increase to goodwill of $160 million due to additional information received during the measurement period. The adjustment is due primarily to a decrease in property, plant and equipment of $100 million, and an increase to certain contingencies that existed as of the acquisition date.

C. MEDFORD INCIDENT

In 2022, a fire occurred at our 210 MBbl/d Medford, Oklahoma, natural gas liquids fractionation facility. In the first quarter of 2023, we reached an agreement with our insurers to settle all claims for physical damage and business interruption related to the Medford incident. Under the terms of the settlement agreement, we agreed to resolve the claims for total insurance payments of $930 million, $100 million of which was received in 2022. The remaining $830 million was received in the first quarter of 2023. The proceeds serve as settlement for property damage, business interruption claims to the date of the settlement and as payment in lieu of future business interruption insurance claims. We applied the $830 million received to our outstanding insurance receivable at December 31, 2022, of $51 million, and recorded an operational gain for the remaining $779 million in other operating income, net, within the Consolidated Statement of Income. We classified proceeds received within the Consolidated Statement of Cash Flows based on our assessment of the nature of the loss (property and business interruption) included in the settlement.

D. FAIR VALUE MEASUREMENTS

Determining Fair Value - For our fair value measurements, we utilize market prices, third-party pricing services, present value methods and standard option valuation models to determine the price we would receive from the sale of an asset or the transfer of a liability in an orderly transaction at the measurement date. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date. Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives based on the lowest level input that is significant to the fair value measurement in its entirety. Our valuation techniques and inputs are consistent with those discussed in Note A of the Notes to Consolidated Financial Statements in our Annual Report.

Recurring Fair Value Measurements -The following tables set forth our recurring fair value measurements as of the dates indicated:

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At June 30, 2024, we heldno cash and posted cash of $65 million with various counterparties, including $24 million of cash collateral that is offsetting derivative net liability positions under master-netting arrangements in the table above. The remaining $41 million of cash collateral in excess of derivative net liability positions is included in other current assets in our Consolidated Balance Sheet.

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2023, we postedno cash and held cash of $41 million with various counterparties, which offsets our derivative net asset position under master netting arrangements as shown in the table above.

Other Financial Instruments - The approximate fair value of cash and cash equivalents, accounts receivable, accounts payable and short-term borrowings is equal to book value due to the short-term nature of these items. Our cash and cash equivalents are composed of bank and money market accounts and are classified as Level 1. Our short-term borrowings are classified as Level 2 since the estimated fair value of the short-term borrowings can be determined using information available in the commercial paper market. We have investments associated with our supplemental executive retirement plan and nonqualified deferred compensation plan that are carried at fair value and primarily are composed of mutual funds, municipal bonds and other fixed income securities classified as Level 1 and Level 2.

The estimated fair value of our consolidated long-term debt, including current maturities, was $20.8 billion and $21.4 billion at June 30, 2024, and December 31, 2023, respectively. The book value of our consolidated long-term debt, including current maturities, was $21.7 billion at June 30, 2024, and December 31, 2023. The estimated fair value of the aggregate senior notes outstanding was determined using quoted market prices for similar issues with similar terms and maturities. The estimated fair value of our consolidated long-term debt is classified as Level 2.

E. RISK-MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES

Risk-management Activities - We are sensitive to changes in the prices of natural gas, NGLs, Refined Products and crude oil, principally as a result of contractual terms under which these commodities are processed, purchased and sold. We are also subject to the risk of interest-rate fluctuation in the normal course of business. We use physical-forward purchases and sales and financial derivatives to secure a certain price for a portion of our natural gas, NGLs, Refined Products, condensate and crude oil purchases and sales; to reduce our exposure to commodity price and interest-rate fluctuations; and to achieve more predictable cash flows. Additionally, we may use physical-forward purchases and financial derivatives to reduce commodity price risk associated with power and natural gas used to operate our facilities. We follow established policies and procedures to assess risk and approve, monitor and report our risk-management activities. We have not used these instruments for trading purposes.

Commodity price risk - Commodity price risk refers to the risk of loss in cash flows and future earnings arising from adverse changes in the price of natural gas, NGLs, Refined Products and crude oil. We may use commodity derivative instruments to reduce the near-term commodity price risk associated with a portion of our forecasted purchases and sales of commodities. Our exposure to commodity price risk is consistent with that discussed in our Annual Report.

Interest-rate risk - We may manage interest-rate risk through the use of fixed-rate debt, floating-rate debt, Treasury locks and interest-rate swaps. At both June 30, 2024, and December 31, 2023, we had no outstanding interest-rate derivative instruments.

Fair Values of Derivative Instruments -The following table sets forth the fair values of our derivative instruments presented on a gross basis as of the dates indicated:

(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheets on a net basis when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us.

(b) - At June 30, 2024, our derivative net liability positions under master-netting arrangements for financial commodity contracts were fully offset by cash collateral of $24 million.

Notional Quantities for Derivative Instruments -The following table sets forth the notional quantities for derivative instruments held as of the dates indicated:

Cash Flow Hedges - During the three and six months ended June 30, 2024 and 2023, we had no material changes in other comprehensive income related to our commodity derivative instruments.

Credit Risk - We monitor the creditworthiness of our counterparties and compliance with policies and limits established by our Risk Oversight and Strategy Committee. We maintain credit policies with regard to our counterparties that we believe minimize credit risk. Our policies and related credit risk are consistent with those discussed in our Annual Report.

F. DEBT

Current Maturities -At June 30, 2024, our current maturities of long-term debt consist of the following:

Commercial Paper Program - At June 30, 2024, we had $180 million of commercial paper outstanding, bearing a weighted-average interest rate of 5.49%. At December 31, 2023, we hadno commercial paper outstanding.

$2.5 Billion Credit Agreement- Our $2.5 Billion Credit Agreement is a revolving credit facility and contains certain customary conditions for borrowing, as well as customary financial, affirmative and negative covenants. Among other things, these covenants include maintaining a ratio of consolidated net indebtedness to adjusted EBITDA (EBITDA, as defined in our $2.5 Billion Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects). In addition, adjusted EBITDA as defined in our $2.5 Billion Credit Agreement allows inclusion of the trailing 12 months of consolidated adjusted EBITDA of any acquired business. In May 2024, we entered into an amendment to our $2.5 Billion Credit Agreement that extended the maturity date byone year, from June 2027 to June 2028. All other terms and conditions of our $2.5 Billion Credit Agreement remain unchanged. In June 2024, we completed the acquisition of a system of NGL pipelines, which allowed us to elect an acquisition adjustment period under our $2.5 Billion Credit Agreement and, as a result, increased our leverage ratio covenant to 5.5 to 1 until the quarter ended March 31, 2025, when it will decrease to 5.0 to 1. As of June 30, 2024, we hadno outstanding borrowings, our ratio of consolidated indebtedness to adjusted EBITDA was 3.9 to 1, and we were in compliance with all covenants under our $2.5 Billion Credit Agreement.

Debt Guarantees - ONEOK, ONEOK Partners, the Intermediate Partnership and Magellan have cross guarantees in place for ONEOK’s and ONEOK Partners’ indebtedness. The Guardian Term Loan Agreement and Viking Term Loan Agreement are not guaranteed by ONEOK, ONEOK Partners, the Intermediate Partnership or Magellan. For further details on our indebtedness, see Note H of the Notes to Consolidated Financial Statements in our Annual Report.

G. EQUITY

Dividends- Holders of our common stock share equally in any dividend declared by our Board of Directors, subject to the rights of the holders of outstanding Series E Preferred Stock. Dividends paid on our common stock in February and May 2024 were 99 cents per share. A common stock dividend of 99 cents per share was declared for shareholders of record at the close of business on August 1, 2024, payable August 14, 2024.

Our Series E Preferred Stock pays quarterly dividends on each share of Series E Preferred Stock when, and if, declared by our Board of Directors, at a rate of 5.5% per year. We paid dividends for the Series E Preferred Stock of $0.3 million in February and May 2024. Dividends totaling $0.3 million were declared for the Series E Preferred Stock and are payable August 14, 2024.

H. EARNINGS PER SHARE

The following tables set forth the computation of basic and diluted EPS for the periods indicated:

I. UNCONSOLIDATED AFFILIATES

Equity in Net Earnings from Investments-The following table sets forth our equity in net earnings from investments for the periods indicated:

In March 2024, we purchased an additional 10% interest in Saddlehorn, resulting in a 40% ownership interest.

We incurred expenses in transactions with unconsolidated affiliates of $56 million and $27 million for the three months ended June 30, 2024 and 2023, respectively, and $95 million and $55 million for the six months ended June 30, 2024 and 2023, respectively, related primarily to Overland Pass and Northern Border. Revenue earned and accounts receivable from, and accounts payable to, our unconsolidated affiliates were not material.

We are the operator of Roadrunner, BridgeTex, MVP and Saddlehorn. In each case, we have operating agreements that provide for reimbursement or payment to us for management services and certain operating costs. Reimbursements and payments included in operating income in our Consolidated Statements of Income for all periods presented were not material.

J. COMMITMENTS AND CONTINGENCIES

Regulatory, Environmental and Safety Matters- The operation of pipelines, terminals, plants and other facilities for the gathering, processing, fractionation, transportation and storage of products is subject to numerous and complex laws and regulations pertaining to health, safety and the environment. As an owner and/or operator of these facilities, we must comply with laws and regulations that relate to air and water quality, hazardous and solid waste management and disposal, cultural resource protection and other environmental and safety matters. The cost of planning, designing, constructing and operating pipelines, terminals, plants and other facilities must incorporate compliance with these laws, regulations and safety standards. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and potentially criminal enforcement measures, including citizen suits, which can include the assessment of monetary penalties, the imposition of remedial requirements and the issuance of injunctions or restrictions on operation or construction. Management does not believe that, based on currently known information, a material risk of noncompliance with these laws and regulations exists that will affect adversely our consolidated results of operations, financial condition or cash flows.

Legal Proceedings -Corpus Christi Terminal Personal Injury Proceeding - Ismael Garcia, Andrew Ramirez and Jesus Juarez Quintero, et al. brought personal injury cases against Magellan and co-defendants Triton Industrial Services, LLC, Tidal Tank, Inc. and Cleveland Integrity Services, Inc. in Nueces County Court in Texas. The claims were originally brought inthree different actions but were consolidated into a single case on March 2, 2021. Claims were asserted by or on behalf ofseven individuals, and certain beneficiaries, who were employed by a contractor and working at a Magellan facility. These individuals were injured, one fatally, as a result of a fire that occurred on December 5, 2020, while they were cleaning a tank at our Corpus Christi terminal. During the first quarter of 2024, we reached settlement with all remaining claimants. In the second quarter of 2024, all settlement payments were made to claimants, and were fully offset by insurance proceeds received.

We are a party to various other legal proceedings that have arisen in the normal course of our operations. While the results of these proceedings cannot be predicted with certainty, we believe the reasonably possible losses from such proceedings, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such proceedings will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

K. REVENUES

Contract Assets and Contract Liabilities- Our contract asset balances at the beginning and the end of the period primarily relate to our firm service transportation contracts with tiered rates, which are not material. Our contract liabilities at the beginning and end of the period relate primarily to deferred revenue on Refined Products and crude transportation contracts, NGL storage contracts and contributions in aid of construction received from customers. The following table sets forth the balances in contract liabilities for the periods indicated:

(a) - Contract liabilities of $104 million and $46 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.

(b) - Contract liabilities of $119 million and $40 million are included in the other current liabilities and other deferred credits, respectively in our Consolidated Balance Sheet.

Receivables from Customers and Revenue Disaggregation - Substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at June 30, 2024, relate to customer receivables. Excluding the insurance receivable related to the legal proceeding described in Note O of the Notes to Consolidated Financial Statements in our Annual Report, substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at December 31, 2023, related to customer receivables. Revenue sources are disaggregated in Note L.

Unsatisfied Performance Obligations - We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) variable consideration on contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

The following table presents aggregate value allocated to unsatisfied performance obligations as of June 30, 2024, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging fromone month to 30 years:

The table above excludes variable consideration allocated entirely to wholly unsatisfied performance obligations, wholly unsatisfied promises to transfer distinct goods or services that are part of a single performance obligation and consideration we determine to be fully constrained. The amounts we determined to be fully constrained relate to future sales obligations under long-term sales contracts where the value is not known and minimum volume agreements, which we consider to be fully constrained until invoiced.

L. SEGMENTS

Segment Descriptions - Our operations are divided into four reportable business segments as follows:

• our Natural Gas Gathering and Processing segment gathers, treats, processes and markets natural gas;

• our Natural Gas Liquids segment gathers, treats, fractionates and transports NGLs and stores, markets and distributes Purity NGLs;

• our Natural Gas Pipelines segment transports and stores natural gas; and

• our Refined Products and Crude segment transports, stores, distributes, blends and markets Refined Products and crude oil.

Other and eliminations consist of corporate costs, the operating and leasing activities of our headquarters building and related parking facility, the activity of our wholly owned captive insurance company and eliminations necessary to reconcile our reportable segments to our Consolidated Financial Statements.

Operating Segment Information -The following tables set forth certain selected financial information for our operating segments for the periods indicated:

(a) - Intersegment revenues are primarily from commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly. Intersegment revenues for the Natural Gas Gathering and Processing segment totaled $632 million and were not material for the Natural Gas Liquids, Refined Products and Crude and Natural Gas Pipelines segments.

(a) - Intersegment revenues are primarily from commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly. Intersegment revenues for the Natural Gas Gathering and Processing segment totaled $521 million and were not material for the Natural Gas Liquids and Natural Gas Pipelines segments.

(b) - Beginning in 2023, we updated our calculation methodology of adjusted EBITDA to include adjusted EBITDA from our unconsolidated affiliates using the same recognition and measurement methods used to record equity in net earnings from investments. This change resulted in an additional $10 million of adjusted EBITDA for the three months ended June 30, 2023.

(a) - Intersegment revenues are primarily from commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly. Intersegment revenues for the Natural Gas Gathering and Processing segment totaled $1.3 billion and were not material for the Natural Gas Liquids, Refined Products and Crude and Natural Gas Pipelines segments.

(a) - Intersegment revenues are primarily from commodity sales, which are based on the contracted selling price that is generally index-based and settled monthly. Intersegment revenues for the Natural Gas Gathering and Processing segment totaled $1.2 billion and were not material for the Natural Gas Liquids and Natural Gas Pipelines segments.

(b) - Beginning in 2023, we updated our calculation methodology of adjusted EBITDA to include adjusted EBITDA from our unconsolidated affiliates using the same recognition and measurement methods used to record equity in net earnings from investments. This change resulted in an additional $26 million of adjusted EBITDA for the six months ended June 30, 2023.

(a) - The six months ended June 30, 2023, includes $702 million related to the Medford incident, including a settlement gain of $779 million, offset partially by $77 million of third-party fractionation costs.

(b) - Beginning in 2023, we updated our calculation methodology of adjusted EBITDA to include adjusted EBITDA from our unconsolidated affiliates using the same recognition and measurement methods used to record equity in net earnings from investments. This change resulted in an additional $10 million and $26 million of adjusted EBITDA for the three and six months ended June 30, 2023, respectively.