Jefferies Financial Group Inc美股招股说明书(2026-05-27版)

The information in this preliminary pricing supplement is not complete and may be changed without notice. This preliminary pricing supplement is not an offer to sell thesesecurities, nor a solicitation of an offer to buy these securities, in any jurisdiction where the offering is not permitted. AMENDMENT NO. 1 TO 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 June 3, 2031 Linked to the Worst-Performing of the Nasdaq-100 Index®, the Russell 2000®Index and the S&P 500®The Senior Autocallable Contingent Coupon Barrier Notes due June 3, 2031 Linked to the Worst-Performing of the Nasdaq-100 Index®, the Russell 2000®Index 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 andprospectus, 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 obligations and you will not have any security interest in, or otherwise have any access to, any Underlying or the securities represented by any Underlying.SUMMARY OF TERMS Senior Autocallable Contingent Coupon Barrier Notes due June 3, 2031 Linked to the Worst-Performing of the Nasdaq-100 Index®, the Russell 2000®Indexand the S&P 500®Index Aggregate PrincipalAmount:Issue Price:Stated Principal Amount:Pricing Date:Original Issue Date:Coupon Observation Dates:Semi-annually, beginning on November 30, 2026, as set forth on page PS-2. The Coupon Observation Dates are subject to postponement as described in June 3, 2026 (3 Business Days after the Pricing Date) 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 described in the accompanying product supplement.Semi-annually, beginning on May 30, 2028, as set forth on page PS-2. The Call Observation Dates are subject to postponement as described in the Coupon Payment Dates: 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 accompanying product supplement.May 29, 2031, subject to postponement as described in the accompanying product supplement. Call Payment Dates: Valuation Date:Maturity Date:Underlying: June 3, 2031, which may be postponed if the Valuation Date is postponed as described in the accompanying product supplement.The worst-performing of the Nasdaq-100 Index®(the “NDX”), the Russell 2000®Index (the “RTY”) and the S&P 500®Index (the “SPX”). Please see “TheUnderlyings” below.The Underlying with the lowest Observation Value or Final Value, as applicable, as compared to its Initial Value. Worst-PerformingUnderlying:Coupon Feature: Contingent Coupon Payments. The Notes will pay a Contingent Coupon Payment of $46.75 on the applicable Coupon Payment Date if the Observation Valueof the Worst-Performing Underlying on the applicable semi-annual 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(beginning approximately two years after the Pricing Date) is equal to or greater than its Call Value. If your Notes are called, you will receive the Call Paymenton 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 Feature: 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. Initial Value:Observation Value:Final Value:Coupon Barrier:Call Value:Threshold Value:Specified Currency:CUSIP/ISIN:Book-entry or CertificatedNote:B