Jefferies Financial Group Inc美股招股说明书(2025-10-15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, Prospectus Supplement dated May 12,2023 and Prospectus dated May 12, 2023) $Jefferies Jefferies Financial Group Inc.Senior Autocallable Contingent Coupon BarrierNotes due October 17, 2030 Linked to the Worst-Performing of the Utilities Select Sector SPDR® Fund, the EURO STOXX 50 Index®and the S&P 500®Index The Senior Autocallable Contingent Coupon BarrierNotes due October 17, 2030 Linked to the Worst-Performing of the Utilities Select Sector SPDR® Fund, the EURO STOXX 50 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 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 securedobligations 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 TERMSIssuer:Jefferies Financial Group Inc. Senior Autocallable Contingent Coupon BarrierNotes due October 17, 2030 Linked to the Worst-Performing of the Utilities Select SectorSPDR® Fund, the EURO STOXX 50 Index®and the S&P 500®Index Title of the Notes: Aggregate Principal Amount:Issue Price:Stated Principal Amount:Pricing Date:Original Issue Date:Coupon Observation Dates: October 17, 2025 (3 Business Days after the Pricing Date)Quarterly, beginning on January 14, 2026, as set forth on page PS-3. The Coupon Observation Dates are subject to postponement as described in the accompanying product supplement.As set forth on page PS-3. 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.Quarterly, beginning on July 14, 2026, as set forth on page PS-3. The Call Observation Dates are subject to postponement as described Call Observation Dates: in the accompanying product supplement.As set forth on page PS-3. The Call Payment Dates may be postponed if the related Call Observation Date is postponed as described in Call Payment Dates: the accompanying product supplement.October 14, 2030, subject to postponement as described in the accompanying product supplement. Valuation Date:Maturity Date:Underlying: October 17, 2030, which may be postponed if the Valuation Date is postponed as described in the accompanying product supplement. The worst-performing of the Utilities Select Sector SPDR® Fund (the “XLU”), the EURO STOXX 50 Index®(the “SX5E”) and the S&P500®Index(the “SPX”).Please see “The Underlyings” below.The Underlying with the lowest Observation Value or Final Value, as applicable, as compared to its Initial Value Worst-Performing Underlying:Coupon Feature: Contingent Coupon Payments. The Notes will pay a Contingent Coupon Payment of $27.50 on the applicable Coupon Payment Date if Call Feature: Autocallable Notes. The Notes will be automatically called if the Observation Value of the Worst-Performing Underlying on any CallObservation Date (beginning approximately nine months after the Pricing Date) is equal to or greater than its Call Value.If your Notesare 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 Amountplusany Contingent Coupon Payment that may otherwise be due on the applicable Call Payment Date.If the Final Value of the Worst-Performing Underlying is greater than or equal to its Threshold Value, you will receive for each Call Payment:Payment at Maturity: 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: With respect to the XLU, the ETF Closing Price of the Underlying on the Pricing Date; with respect to each of the SX5E and the SPX, theIndex Closing Value of the Underlying on the Pricing Date.With respect to the XLU, the ETF Closing Price of the Underlyingtimesthe Adjustment Factor on the applicable Coupon Observation Observation Value: Date or Call Observation Date; with respect to each of the SX5E and the SPX, the Index Closing Value of the Underlying on theapplicable Coupon Observat