National Fuel Gas Co美股招股说明书(2026-08-11版)

500,000 Shares National Fuel Gas Company Common Stock Direct Stock Purchase and Dividend Reinvestment Plan CUSIP 636180101 This prospectus supplement relates to 500,000 shares of common stock, par value $1.00 per share, of National Fuel Gas Company. All of theshares being offered hereby will be sold pursuant to the National Fuel Gas Company Direct Stock Purchase and Dividend Reinvestment Plan (the“Plan”). You should read this prospectus supplement carefully before you invest. The price of the common stock will be based upon market prices prevailing at the time of sale. The Company’s common stock is listed on the NewYork Stock Exchange (the “NYSE”) under the symbol “NFG.” The last reported sale price of our common stock on the NYSE on August10, 2026 was$81.82 per share. If you are currently participating in the Plan, you will remain enrolled in the Plan, and you do not have to take any action unless you wish to makea change to your Plan account or terminate your participation. To the extent required by applicable law in certain jurisdictions, shares of common stock offered under the Plan to certain persons are offered onlythrough a registered broker in such jurisdictions. The Company’s principal executive offices are located at 6363 Main Street, Williamsville, New York 14221, and its telephone number is Investing in the Company involves a number of risks. You should carefully consider theRisk Factorsreferenced atpage S-4of this prospectus supplement before investing in the Company. Please retain this prospectus supplement for future reference. Table of Contents TABLE OF CONTENTS Prospectus Supplement About This Prospectus SupplementWhere You Can Find More InformationInformation We Incorporate by ReferenceSafe Harbor for Forward-Looking StatementsSummaryRisk FactorsUse of ProceedsPurpose of the PlanAdministrator of the PlanEnrollmentInvestment OptionsDividend ReinvestmentCash Payments Only (No Dividend Reinvestment)Direct Deposit of DividendsOptional Cash InvestmentsPurchase of Shares for the PlanPurchase IntervalsSource and Pricing of SharesTiming and ControlSale of Shares for the PlanMethods of SaleTypes of Sale OrdersTiming and ControlAutomatic Deposit of Sale ProceedsTermination of Plan AccountSafekeeping of Your Stock CertificatesTransfer of SharesIssuance of CertificatesInvestment Summary and FeesTracking Your InvestmentsWaiver DiscountSubmission of Requests for WaiverAction on Large Cash Purchase RequestsU.S. Federal Income Tax InformationInitial Investment and Optional Cash PaymentsReinvestment of DividendsDeposit, Withdrawal or Sale of SharesTaxation of Deemed DistributionsMedicare Tax on Net Investment IncomeWithholding and Information ReportingFATCA Table of Contents Description of Common StockDividend RightsVoting RightsLiquidation RightsPreemptive RightsBusiness CombinationsListingTransfer Agent and RegistrarPlan of Distribution MiscellaneousStock Splits, Stock Dividends and Other DistributionsVoting of ProxiesResponsibility of National Fuel Gas Company and the Plan AdministratorPlan Modification or TerminationChange of Eligibility; TerminationForeign Participation Legal MattersExperts Prospectus About This ProspectusRisk FactorsNational Fuel Gas CompanyWhere You Can Find More InformationIncorporation by ReferenceUse of ProceedsDescription of Debt SecuritiesDescription of Capital StockDescription of Depositary SharesDescription of Stock Purchase Contracts and Stock Purchase UnitsDescription of UnitsPlan of DistributionExpertsLegal Matters Table of Contents About This Prospectus Supplement We provide information to you about this offering in two separate documents. The accompanying prospectus provides general information aboutus and the securities we may offer from time to time, some of which may not apply to this offering. This prospectus supplement describes the specificdetails regarding our common stock offered hereby. Additional information is incorporated by reference in this prospectus supplement. If information inthis prospectus supplement is inconsistent with the accompanying prospectus, you should rely on this prospectus supplement. You should rely only on the information contained or incorporated by reference in this prospectus supplement, in the accompanying prospectus orin any free writing prospectus that we may provide to you. We have not authorized anyone to provide you with different information. You should notassume that the information contained in this prospectus supplement, the accompanying prospectus or any document incorporated by reference isaccurate as of any date other than the date mentioned on the cover page of these documents. Our business, financial condition, results of operations andprospects may have changed since those dates. We are not making offers to sell the securities in any jurisdiction in which an offer or solicitation is notauthorized or in which the person making such offer or solicitation is not qualified to do so or to anyone to