Atmos Energy Corp美股招股说明书(2025-09-22版)

Prospectus SupplementSeptember18, 2025(To Prospectus dated December3, 2024) $600,000,000 Atmos Energy Corporation 5.450% Senior Notes due 2056 This is an offering of $600,000,000 aggregate principal amount of 5.450% Senior Notes due 2056 (the “notes”). The notes will bear interest at therate of 5.450% per year and will mature on January15, 2056. We will pay interest on the notes semi-annually in arrears on January15 and July15 ofeach year they are outstanding, beginning January15, 2026. We may redeem the notes prior to maturity at our option, at any time in whole or from timeto time in part, at the applicable redemption prices described in this prospectus supplement. See “Description of the Notes—Optional Redemption.” The notes are unsecured senior obligations and rank equally in right of payment with all of our other existing and future unsubordinated debt. Thenotes will be issued only in registered form in minimum denominations of $2,000 and any integral multiple of $1,000 in excess thereof. The notes are anew issue of securities with no established trading market. The notes will not be listed on any securities exchange or quoted on any automated dealerquotation system. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities ordetermined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is acriminal offense. The underwriters expect to deliver the notes to investors in book-entry form only through the facilities of The Depository Trust Company for theaccounts of its participants, including Clearstream Banking S.A. and/or Euroclear Bank SA/NV, on or about October1, 2025. Joint Book-Running Managers BNPPARIBASCIBCCapitalMarkets MizuhoUSBancorp WellsFargoSecurities Senior Co-ManagerTD SecuritiesCo-Managers ComericaSecurities Table of Contents TABLE OF CONTENTS Prospectus Supplement Important Notice About Information in this Prospectus Supplement and the Accompanying ProspectusCautionary Statement Regarding Forward-Looking StatementsProspectus Supplement SummaryRisk FactorsUse of ProceedsCapitalizationBusinessDescription of the NotesCertain Material U.S. Federal Income Tax ConsiderationsUnderwritingLegal MattersExpertsIncorporation of Certain Documents by Reference Prospectus Cautionary Statement Regarding Forward-Looking StatementsRisk FactorsAtmos Energy CorporationSecurities We May OfferUse of ProceedsDescription of Debt SecuritiesDescription of Common Stock Plan of Distribution Legal Matters Table of Contents IMPORTANT NOTICE ABOUT INFORMATION IN THIS PROSPECTUSSUPPLEMENT AND THE ACCOMPANYING PROSPECTUS This document consists of two parts. The first part is this prospectus supplement, which describes the specific terms of this offering of the notesand also adds to and updates information contained in the accompanying prospectus and the documents incorporated by reference in this prospectussupplement and the accompanying prospectus. The second part is the accompanying prospectus, dated December3, 2024, which gives more generalinformation, some of which does not apply to this offering. To the extent there is a conflict between the information contained in this prospectussupplement, the information contained in the accompanying prospectus or the information contained in any document incorporated by reference hereinor therein, the information contained in the most recent document shall control. This prospectus supplement and the accompanying prospectus are a partof a registration statement that we filed with the Securities and Exchange Commission (the “SEC”) using the SEC’s shelf registration rules. We have not, and the underwriters have not, authorized any other person to provide you with information other than information provided orincorporated by reference in this prospectus supplement, the accompanying prospectus or any free writing prospectus relating to the offering of notesmade pursuant to this prospectus supplement. We and the underwriters take no responsibility for, and can provide no assurances as to the reliability of,any other information that others may give you or representations that others may make. See “Incorporation of Certain Documents by Reference” and“Where You Can Find More Information” in the accompanying prospectus. Neither Atmos Energy Corporation nor the underwriters are making an offer of these notes in any jurisdiction where the offer is not permitted. The information contained in or incorporated by reference in this document is accurate only as of the date of this prospectus supplement or thedate of such incorporated documents, regardless of the time of delivery of this prospectus supplement or of any sale of notes. Our business, financialcondition, results of operations and prospects may have changed since those respective dates. The terms “we,” “our,” “us,” and “Atmos Energy” refer to Atmos Energy Corporatio