Jefferies Financial Group Inc美股招股说明书(2026-07-23版)

PRELIMINARY PRICING SUPPLEMENT(to Product Supplement no. 5, dated May 11, 2026,Prospectus Supplement dated May 11, 2026and Prospectus dated May 11, 2026) $Jefferies Jefferies Financial Group Inc.Senior Autocallable Contingent Coupon Barrier Notes due August 16, 2032 Senior Autocallable Contingent Coupon Barrier Notes due August 16, 2032 Linked to the Worst-Performing of the Dow Jones Industrial Average®, theRussell 2000®Index and the S&P 500®Index Quarterly, beginning on November 9, 2026, as set forth on page PS-2. The Coupon Observation Dates are subject to postponement as described in theaccompanying product supplement. Coupon Payment Dates: As set forth on page PS-2. The Coupon Payment Dates may be postponed if the related Coupon Observation Date is postponed as described in theaccompanying product supplement.Quarterly, beginning on August 9, 2027, as set forth on page PS-2. The Call Observation Dates are subject to postponement as described in the Call Observation Dates: accompanying product 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 Call Payment Dates: accompanying product supplement.August 9, 2032, subject to postponement as described in the accompanying product supplement. August 16, 2032, which may be postponed if the Valuation Date is postponed as described in the accompanying product supplement. Contingent Coupon Payments. The Notes will pay a Contingent Coupon Payment of $25.75 on the applicable Coupon Payment Date if the ObservationValue of the Worst-Performing Underlying on the applicable quarterly Coupon Observation Date is greater than or equal to its Coupon Barrier.Autocallable Notes. The Notes will be automatically called if the Observation Value of the Worst-Performing Underlying on any Call Observation Date Call Feature: (beginning approximately one year after the Pricing Date) is equal to or greater than its Call Value. If your Notes are called, you will receive the CallPayment on the applicable Call Payment Date, and no further amounts will be payable on the Notes.The Stated Principal Amount plus any Contingent Coupon Payment that may otherwise be due on the applicable Call Payment Date. Call Payment:Payment at Maturity: If the Final Value of the Worst-Performing Underlying is greater than or equal to its Threshold Value, you will receive for each Note that you hold aPayment at Maturity that is equal to the Stated Principal AmountIf the Final Value of the Worst-Performing Underlying is less than its Threshold Value, you will receive for each Note that you hold a Payment at Maturity that is less than the Stated Principal Amount of each Note that will equal: The Payment at Maturity will also include the final Contingent Coupon Payment if the Observation Value of the Worst-Performing Underlying on the finalCoupon Observation Date is greater than or equal to its Coupon Barrier.With respect to each Underlying, the Index Closing Value of the Underlying on the Pricing Date. Estimated value on the PricingApproximately $978.40 per Note, or within $30.00 of that estimate. Please see “The Notes” below. The Notes will be our senior unsecured obligations and will rank equally with our other senior unsecured indebtedness.Investing in the Notes involves risks that are described in the “Risk Factors” section beginning on page PS-6 of this pricing supplement. Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this pricing supplement or theaccompanying 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 August 14, 2026 against payment in immediately available funds.Jefferies You should read this pricing supplement together with the related product supplement, prospectus and prospectus supplement, each of which can be accessed via the hyperlinks 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 PRICING SUPPLEMENT SPECIAL NOTE ON FORWARD-LOOKING STATEMENTSPS-iiTHE NOTESPS-1HOW THE NOTES WORKPS-4RISK FACTORSPS-6THE UNDERLYINGSPS-11HEDGINGPS-19SUPPLEMENTAL DISCUSSION OF U.S. FEDERAL INCOME TAX CONSEQUENCESPS-20SUPPLEMENTAL PLAN OF DISTRIBUTIONPS-25CONFLICT OF INTERESTPS-29LEGAL MATTERSPS-30EXPERTSPS-31 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 different information. We are not mak