UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): July 25, 2023

MAGELLAN MIDSTREAM PARTNERS, L.P.

(Exact Name of Registrant as Specified in Charter)

Delaware

1-16335

73-1599053

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(IRS Employer

Identification No.)

One Williams Center

Tulsa, Oklahoma 74172

(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code (918) 574-7000

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☒☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐☒ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class

Trading Symbol(s)

Name of Each Exchange

on Which Registered

Common Units

MMP

New York Stock Exchange

Item 8.01 Other Events.

As previously announced, on May 14, 2023, Magellan Midstream Partners, L.P. (NYSE: MMP), a Delaware limited partnership (“Magellan”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with ONEOK, Inc., an Oklahoma corporation (NYSE: ONEOK) (“ONEOK”), and Otter Merger Sub, LLC, a Delaware limited liability company and a newly formed, wholly owned subsidiary of ONEOK (“Merger Sub”), pursuant to which, upon the terms and subject to the conditions of the Merger Agreement, Merger Sub will merge with and into Magellan (the “Merger”), with Magellan continuing as the surviving entity and a wholly owned subsidiary of ONEOK.

On July 25, 2023, Magellan issued a press release ~~commenting~~announcing onthe afiling ~~report~~of ~~regarding~~a ~~the~~definitive ~~Merger~~proxy ~~written~~statement bywith ~~Robert~~the ~~Willens,~~U.S. anSecurities ~~independent expert~~ and ~~specialist~~Exchange inCommission ~~interpreting~~(the ~~tax and accounting~~“SEC”) ~~issues~~in ~~and~~connection ~~their~~with ~~effects~~the ~~on corporate transactions~~Merger. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Cautionary Statement Regarding Forward-Looking Statements

This report contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements, other than statements of historical fact, included in this report that address activities, events or developments that ONEOK or Magellan expects, believes or anticipates will or may occur in the future are forward-looking statements. Words such as “estimate,” “project,” “predict,” “believe,” “expect,” “anticipate,” “potential,” “create,” “intend,” “could,” “would,” “may,” “plan,” “will,” “guidance,” “look,” “goal,” “future,” “build,” “focus,” “continue,” “strive,” “allow” or the negative of such terms or other variations thereof and words and terms of similar substance used in connection with any discussion of future plans, actions, or events identify forward-looking statements. However, the absence of these words does not mean that the statements are not forward-looking. These forward-looking statements include, but are not limited to, statements regarding the Merger, the expected closing of the Merger and the timing thereof and as adjusted descriptions of the post-transaction company and its operations, strategies and plans, integration, debt levels and leverage ratio, capital expenditures, cash flows and anticipated uses thereof, synergies, opportunities and anticipated future performance, including maintaining current ONEOK management, enhancements to investment-grade credit profile, an expected accretion to earnings and free cash flow, dividend payments and potential share repurchases, increase in value of tax attributes and expected impact on EBITDA. Information adjusted for the Merger should not be considered a forecast of future results. There are a number of risks and uncertainties that could cause actual results to differ materially from the forward-looking statements included in this report. These include the risk that ONEOK’s and Magellan’s businesses will not be integrated successfully; the risk that cost savings, synergies and growth from the Merger may not be fully realized or may take longer to realize than expected; the risk that the credit ratings of the combined company or its subsidiaries may be different from what the companies expect; the possibility that shareholders of ONEOK may not approve the issuance of new shares of ONEOK common stock in the Merger or that unitholders of Magellan may not approve the Merger; the risk that a condition to closing of the Merger may not be satisfied, that either party may terminate the Merger Agreement or that the closing of the Merger might be delayed or not occur at all; potential adverse reactions or changes to business or employee relationships, including those resulting from the announcement or completion of the Merger; the occurrence of any other event, change or other circumstances that could give rise to the termination of the Merger Agreement relating to the Merger; the risk that ONEOK may not be able to secure the debt financing necessary to fund the cash consideration required for the Merger; the risk that changes in ONEOK’s capital structure and governance could have adverse effects on the market value of its securities; the ability of ONEOK and Magellan to retain customers and retain and hire key personnel and maintain relationships with their suppliers and customers and on ONEOK’s and Magellan’s operating results and business generally; the risk the Merger could distract management from ongoing business operations or cause ONEOK and/or Magellan to incur substantial costs; the risk of any litigation relating to the Merger; the risk that ONEOK may be unable to reduce expenses or access financing or liquidity; the impact of the COVID-19 pandemic, any related economic downturn and any related substantial decline in commodity prices; the risk of changes in governmental regulations or enforcement practices, especially with respect to environmental, health and safety matters; and other important factors that could cause actual results to differ materially from those projected. All such factors are difficult to predict and are beyond ONEOK’s or Magellan’s control, including those detailed in ~~ONEOK’s Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K that are available on ONEOK’s website at www.oneok.com and on~~ the ~~website~~joint ofproxy ~~the~~statement/prospectus ~~Securities and Exchange Commission~~ (~~the~~as ~~“SEC”)~~defined ~~at www~~below).~~sec.gov,~~ and those detailed in Magellan’s Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K that are available on Magellan’s website at www.magellanlp.com and on the website of the SEC. All forward-looking statements are based on assumptions ~~that~~ that ONEOK and Magellan believe to be reasonable but that may not prove to be accurate. Any forward-looking statement speaks only as of ~~the~~ the date on which such statement is made, and neither ONEOK nor Magellan undertakes any obligation to correct or update any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by applicable law. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof.

No Offer or Solicitation

This report is not intended to and shall not constitute an offer to sell or the solicitation of an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

Non-GAAP Financial Measures

This report contains references to certain non-GAAP financial measures. The non-GAAP financial measures presented may not provide information that is directly comparable to that provided by other companies, as other companies may calculate such financial results differently. ONEOK’s or Magellan’s non-GAAP financial measures are not measurements of financial performance under GAAP and should not be considered as alternatives to amounts presented in accordance with GAAP. ONEOK and Magellan view these non-GAAP financial measures as supplemental and they are not intended to be a substitute for, or superior to, the information provided by GAAP financial results.

Important Additional Information and Where to Find It

In connection with the Merger, on ~~June~~July 2025, 2023, ONEOK ~~filed~~and ~~with the~~Magellan ~~SEC~~each ~~a registration statement on Form S-4, which was amended by Amendment No. 1 to Form S-4~~ filed with the SEC ~~on July 11, 2023 (the “Registration Statement”), containing~~ a ~~prospectus~~definitive ~~of ONEOK and~~ joint proxy statement/prospectus ~~of ONEOK and Magellan~~ (the “joint proxy statement/prospectus”), and each party will file other documents regarding the Merger with the SEC. ~~The~~Each ~~Registration~~of ~~Statement~~ONEOK ~~was~~and ~~declared~~Magellan ~~effective~~commenced bymailing copies of the ~~SEC~~joint proxy statement/prospectus to shareholders of ONEOK and unitholders of Magellan, respectively, on or about July 2425, 2023. This report is not a substitute for the joint proxy statement/prospectus or ~~Registration Statement or~~ for any other document that ONEOK or Magellan has filed or may file in the future with the SEC in connection with the Merger. INVESTORS AND SECURITY HOLDERS OF ONEOK AND MAGELLAN ARE URGED TO CAREFULLY AND THOROUGHLY READ THE ~~REGISTRATION STATEMENT, THE~~ JOINT PROXY STATEMENT/PROSPECTUS, INCLUDING ALL AMENDMENTS AND SUPPLEMENTS THERETO, AND OTHER RELEVANT DOCUMENTS FILED OR THAT WILL BE FILED BY ONEOK AND MAGELLAN WITH THE SEC BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT ONEOK AND MAGELLAN, THE MERGER, THE RISKS RELATED THERETO AND RELATED MATTERS.

Each of ONEOK and Magellan will commence mailing copies of the definitive joint proxy statement/prospectus to shareholders of ONEOK and unitholders of Magellan, respectively, on or about July 25, 2023. Investors ~~will~~ becan ~~able to~~ obtain free copies of the ~~Registration Statement and the~~ joint proxy statement/prospectus and other relevant documents filed by ONEOK and Magellan with the SEC through the website maintained by the SEC at www.sec.gov. Copies of documents filed with the SEC by ONEOK, including the joint proxy statement/prospectus, ~~will~~are be available free of charge from ONEOK’s website at www.oneok.com under the “Investors” tab. Copies of documents filed with the SEC by Magellan, including the joint proxy statement/prospectus, ~~will~~ beare available free of charge from Magellan’s website at www.magellanlp.com under the “Investors” tab.

Participants in the Solicitation

ONEOK and certain of its directors, executive officers and other members of management and employees, Magellan, and certain of the directors, executive officers and other members of management and employees of Magellan GP, LLC, which manages the business and affairs of Magellan, may be deemed to be participants in the solicitation of proxies from ONEOK’s shareholders and the solicitation of proxies from Magellan’s unitholders, in each case with respect to the Merger. Information about ONEOK’s directors and executive officers is available in ONEOK’s Annual Report on Form 10-K for the 2022 fiscal year filed with the SEC on February 28, 2023, and its definitive proxy statement for the 2023 annual meeting of shareholders filed with the SEC on April 5, 2023, and in the joint proxy statement/prospectus. Information about Magellan’s directors and executive officers is available in its Annual Report on Form 10-K for the 2022 fiscal year and its definitive proxy statement for the 2023 annual meeting of unitholders, each filed with the SEC on February 21, 2023, and the joint proxy statement/prospectus. Other information regarding the participants in the solicitations and a description of their direct and indirect interests, by security holdings or otherwise, are included in the Registration Statement, the joint proxy statement/prospectus and other relevant materials filed or that may in the future be filed with the SEC regarding the Merger when they become available. Shareholders of ONEOK, unitholders of Magellan, potential investors and other readers should read the joint proxy statement/prospectus before making any voting or investment decisions.

No Advice

This report has been prepared for informational purposes only and is not intended to provide, and should not be relied on for, tax, legal or accounting advice. Magellan unitholders should consult their own tax and other advisors before making any decisions regarding the Merger.

Item 9.01. Financial Statements and Exhibits.

99.1	Press Release dated July 25, 2023.

104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	Magellan Midstream Partners, L.P.

	By:	Magellan GP, LLC,
		its general partner

Date: July 25, 2023	By:	/s/ Jeff L. Holman
	Name:	Jeff L. Holman
	Title:	Executive Vice President, Chief Financial Officer and Treasurer

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