Item 1.01. Entry into a Material Definitive Agreement. On June 18, 2026, Atmos Energy Corporation (“Atmos Energy”) completed a public offering of $700,000,000 million aggregate principal amount of its 4.750% Senior Notes due 2032 (the “Notes”). The offering has been registered under the Securities Act of 1933, as amended (the “Securities Act”), pursuant to a registration statement on Form S-3 (Registration No. 333-283563) of Atmos Energy and the Prospectus Supplement dated June 15, 2026, which was filed with the Securities and Exchange Commission pursuant to Rule 424(b) of the Securities Act on June 17, 2026. Atmos Energy received net proceeds from the offering, after the underwriting discount and estimated offering expenses payable by it, of approximately $693.9 million. The Notes were issued pursuant to an indenture dated as of March 26, 2009 (the “Base Indenture”) between Atmos Energy and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee (the “Trustee”), and an officers’ certificate delivered to the Trustee pursuant to Section 301 of the Base Indenture (the “Officers’ Certificate,” and the Base Indenture, as modified by the Officers’ Certificate, is referred to herein as the “Indenture”). The Notes are represented by two global securities executed by Atmos Energy on June 18, 2026 (the “Global Securities”). The Notes are unsecured senior obligations that rank equally in right of payment with all of Atmos Energy’s other existing and future unsubordinated debt. The Notes bear interest at an annual rate of 4.750%, payable by Atmos Energy on January 15 and July 15 of each year, beginning on January 15, 2027, and mature on January 15, 2032. Atmos Energy may redeem the Notes at its option at any time or from time to time, in whole or in part, at the redemption prices calculated in accordance with the Indenture. The Indenture includes covenants that limit the ability of Atmos Energy and its restricted subsidiaries (as defined in the Indenture) to, among other things, (i) grant specified liens, (ii) engage in specified sale and leaseback transactions, (iii) consolidate or merge with or into other companies or (iv) sell all or substantially all of Atmos Energy’s assets. The restrictive covenants are subject to a number of exceptions and qualifications set forth in the Indenture. The Indenture provides for events of default, including (i) interest payment defaults, (ii) breaches of covenants, (iii) certain payment defaults at final maturity or acceleration of other indebtedness and (iv) the occurrence of events of bankruptcy, insolvency or reorganization. If any event of default occurs and is continuing, subject to certain exceptions, the Trustee or the holders of at least 25% in aggregate principal amount of the then outstanding Notes may declare all the Notes to be due and payable immediately, together with any accrued and unpaid interest. The above descriptions are qualified in their entirety by reference to the text of the Base Indenture, the Officers’ Certificate, and the Global Securities. The Base Indenture has been previously filed, the Officers’ Certificate is filed as Exhibit 4.2, and the Global Securities are filed as Exhibit 4.3 and Exhibit 4.4, respectively, to this Current Report on Form 8-K, and each is incorporated herein by reference. Item 9.01. Financial Statements and Exhibits. (d) Exhibits Exhibit Number Description 4.1 Indenture dated as of March 26, 2009, between the Company and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee. Incorporated by reference to Exhibit 4.1 to the Company’s Form 8-K dated March 26, 2009 (File No. 1-10042). 4.2 Officers’ Certificate dated June 18, 2026 4.3 Global Security for the 4.750% Senior Notes due 2032 4.4 Global Security for the 4.750% Senior Notes due 2032 104 Cover Page Interactive Data File. The cover page XBRL tags are embedded within the inline XBRL document (contained in Exhibit 101). SIGNATURE 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. ATMOS ENERGY CORPORATION (Registrant) DATE: June 18, 2026 By: /s/ Daniel M. Meziere Daniel M. Meziere Vice President of Investor Relations and Treasurer