Jefferies Financial Group Inc美股招股说明书(2026-05-19版)

Prospectus Supplement dated May 11,2026 and Prospectus dated May 11, 2026) $2,219,000Jefferies Jefferies Financial Group Inc.Senior Autocallable Barrier Notes due May 20, 2031 Linked to the Worst-Performing of the Russell 2000®Index, the S&P 500®Index and the Dow Jones Industrial Average ®The Senior Autocallable Barrier Notes due May 20, 2031 Linked to the Worst-Performing of the Russell 2000®Index,the S&P 500®Index and the Dow Jones Industrial Average® (the “Notes”) are senior All payments are subject to our credit risk.If we default on our obligations, you could lose some or a significant portion of your investment.These Notes are not secured obligations andyou will not have any security interest in, or otherwise have any access to, any Underlying or the securities represented by any Underlying. Annually, beginning on May 17, 2027, as set forth on page PS-2. The Call Observation Dates are subject to postponement as described in the accompanyingproduct supplement.As set forth on page PS-2. The Call Payment Dates may be postponed if the related Call Observation Date is postponed as described in the accompanying The worst-performing of the Russell 2000®Index (the “RTY”), the S&P 500®Index (the “SPX”) and the Dow Jones Industrial Average®(the “INDU”).Please see“The Underlyings” below. Autocallable Notes. The Notes will be automatically called if the Observation Value of the Worst-Performing Underlying on any Call Observation Date (beginningapproximately one year after the Pricing Date) is equal to or greater than its Call Value.If your Notes are called, you will receive the applicable Call Payment onthe applicable Call Payment Date, and no further amounts will be payable on the Notes.The Stated Principal Amountplusthe applicable Call Premium.The Call Premium applicable to each Call Observation Date is set forth on page PS-2 and reflects a return of approximately 13.30% per annum. The Notes are With respect to the fifth Call Observation Date: 39,620.94 with respect to the INDU (80% of its Initial Value, rounded to two decimal places); 2,234.639 with respectto the RTY (80% of its Initial Value, rounded to three decimal places); and 5,926.80 with respect to the SPX (80% of its Initial Value, rounded to two decimal places)37,144.63 with respect to the INDU (75% of its Initial Value, rounded to two decimal places); 2,094.974 with respect to the RTY (75% of its Initial Value, rounded tothree decimal places); and 5,556.38 with respect to the SPX (75% of its Initial Value, rounded to two decimal places)U.S. dollars Jefferies LLC, a wholly-owned subsidiary of Jefferies Financial Group Inc. See “Supplemental Plan of Distribution.”Jefferies Financial Services, Inc., a wholly owned subsidiary of Jefferies Financial Group Inc. Jefferies LLC, the broker-dealer subsidiary of Jefferies Financial Group Inc., is a member of FINRA and will participate in the distribution of the notes being offeredhereby.Accordingly, the offering is subject to the provisions of FINRA Rule 5121 relating to conflicts of interest and will be conducted in accordance with therequirements of Rule 5121.See “Conflict of Interest.”The Notes will be our senior unsecured obligations and will rank equally with our other senior unsecured indebtedness. 1 An affiliate of the Issuer will pay a structuring fee of up to $6.50 per Note in connection with the distribution of the Notes to other registered broker-dealers.Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this pricingsupplement or the accompanying product supplement, prospectus or prospectus supplement is truthful or complete.Any representation to the contrary is a criminal offense.As used in this pricing supplement,“we,”“us”and“our”refer to Jefferies Financial Group Inc., unless the context requires otherwise.We will deliver the Notes in book-entry form only through The Depository Trust Company on or about May 20, 2026 against payment in immediately available funds.Jefferies Pricing supplement dated May 15, 2026.You should read this pricing supplement together with the related product supplement, prospectus and prospectus supplement, each of which can be accessed via thehyperlinks below, before you decide to invest.Product Supplement No. 5 dated May 11, 2026Prospectus Supplement dated May 11, 2026 and Prospectus dated May 11, 2026 TABLE OF CONTENTS PRICING SUPPLEMENT SPECIAL NOTE ON FORWARD-LOOKING STATEMENTSPS-iiTHE NOTESPS-1HOW THE NOTES WORKPS-3RISK FACTORSPS-4THE UNDERLYINGSPS-9HEDGINGPS-17SUPPLEMENTAL DISCUSSION OF U.S. FEDERAL INCOME TAX CONSEQUENCESPS-18SUPPLEMENTAL PLAN OF DISTRIBUTIONPS-22CONFLICT OF INTERESTPS-26LEGAL MATTERSPS-27EXPERTSPS-28 You should rely only on the information contained in or incorporated by reference in this pricing supplement and theaccompanying product supplement, prospectus and prospectus supplement.We have not authorized anyone to provide youwith diffe