Jefferies Financial Group Inc美股招股说明书(2026-05-11版)

The information in this preliminary pricing supplement is not complete and may be changed without notice. This preliminary pricingsupplement is not an offer to sell these securities, nor a solicitation of an offer to buy these securities, in any jurisdiction where the offering isnot permitted. PRELIMINARY PRICING SUPPLEMENT(to Product Supplement no. 5, dated October 23, 2023, SUBJECT TO COMPLETION, DATED May 5, 2026 Prospectus Supplement dated May 12, 2023and Prospectus dated May 12, 2023) $Jefferies Jefferies Financial Group Inc.Senior Autocallable Contingent Coupon Barrier Notes due May 10, 2029 Linked to the Worst-Performing of the Dow Jones Industrial Average®and the S&P 500®IndexThe Senior Autocallable Contingent Coupon Barrier Notes due May 10, 2029 Linked to the Worst-Performing of the Dow Jones Industrial Average®and the S&P 500®Index (the “Notes”) are senior unsecured obligations of Jefferies Financial Group Inc. The Notes have the terms described in the accompanying product supplement, prospectus supplement and prospectus,as supplemented or modified by this pricing supplement. The Notes are issued as part of our Series A Global Medium-Term Notes program.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 Title of the Notes: Aggregate Principal Amount:Issue Price:Stated Principal Amount:Pricing Date:Original Issue Date:Coupon Observation Dates: May 11, 2026 (2 Business Days after the Pricing Date)Monthly, beginning on June 8, 2026, as set forth on page PS-2. The Coupon Observation Dates are subject to postponement as described in the accompanying product supplement.As set forth on page PS-2. The Coupon Payment Dates may be postponed if the related Coupon Observation Date is postponed as Coupon Payment Dates: described in the accompanying product supplement.Monthly, beginning on May 7, 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.May 7, 2029, subject to postponement as described in the accompanying product supplement. Valuation Date:Maturity Date:Underlying: May 10, 2029, which may be postponed if the Valuation Date is postponed as described in the accompanying product supplement. Worst-Performing Underlying:Coupon Feature: The Underlying with the lowest Observation Value or Final Value, as applicable, as compared to its Initial Value.Contingent Coupon Payments. The Notes will pay a Contingent Coupon Payment of $7.83 on the applicable Coupon Payment Date if the Observation Value of the Worst-Performing Underlying on the applicable monthly Coupon Observation Date is greater than or equal to itsCoupon Barrier.Autocallable Notes. The Notes will be automatically called if the Observation Value of the Worst-Performing Underlying on any Call Call Feature: Observation Date (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 Call Payment 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 a Payment 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: In this scenario the Payment at Maturity will be less than the Stated Principal Amount and you could lose some or all of your investment.The Payment at Maturity will also include the final Contingent Coupon Payment if the Observation Value of the Worst-Performing Underlyingon the final Coupon 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. With respect to each Underlying, the Index Closing Value of the Underlying on the applicable Coupon Observation Date or Call Observation Date.With respect to each Underlying, the Index Closing Value of the Underlying on the Valuation Date. Final Value:Coupon Barrier:Call Value:Threshold Value:Specified Currency:CUSIP/ISIN:Book-entry or Certificated Note:Business Day:Agent:Calculation Agent:Trustee:Estimated value on the PricingDate:Use of Proceeds:Listing:Conflict of Interest: With respect to each Un