杰弗里斯金融服务集团股份有限公司美国存托股份招股说明书(2026-01-09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, $Jefferies Senior Autocallable Contingent Coupon BarrierNotes due January 30, 2032 Linked to the Worst-Performing of the S&P 500®Index, the Russell 2000®Index and the Dow Jones Industrial Average The Senior Autocallable Contingent Coupon BarrierNotes due January 30, 2032 Linked to the Worst-Performing of the S&P 500®Index, the Russell 2000®Index and the Dow JonesIndustrial Average®(the “Notes”) are senior unsecured obligations of Jefferies Financial Group Inc.The Notes have the terms described in the accompanying product supplement,prospectus supplement and prospectus, as supplemented or modified by this pricing supplement.The Notes are issued as part of our Series A Global Medium-Term Notes program. All payments are subject to our credit risk.If we default on our obligations, you could lose some or a significant portion of your investment.These Notes are not securedobligations and you will not have any security interest in, or otherwise have any access to, any Underlying or the securities represented by any Underlying.SUMMARY OF TERMS Jefferies Financial Group Inc.Senior Autocallable Contingent Coupon BarrierNotes due January 30, 2032 Linked to the Worst-Performing of the S&P 500®Index, the Russell 2000®Index andthe Dow Jones Industrial Average®$. We may increase the Aggregate Principal Amount prior to the Original Issue Date but are not required to do so. $1,000 per Note$1,000 per Note January 23, 2026January 30, 2026 (5 Business Days after the Pricing Date) Quarterly, beginning on April 23, 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 described in the accompanyingproduct supplement. Quarterly, beginning on January 25, 2027, as set forth on page PS-2. The Call Observation Dates are subject to postponement as described in the accompanyingproduct supplement. Call Payment Dates: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 productsupplement. Valuation Date:Maturity Date:Underlying: January 23, 2032, subject to postponement as described in the accompanying product supplement.January 30, 2032, which may be postponed if the Valuation Date is postponed as described in the accompanying product supplement. The worst-performing of the S&P 500®Index (the “SPX”), the Russell 2000®Index (the “RTY”) and the Dow Jones Industrial Average®(the “INDU”).Please see The Underlying with the lowest Observation Value or Final Value, as applicable, as compared to its Initial Value Worst-Performing Contingent Coupon Payments. The Notes will pay a Contingent Coupon Payment of $25.00 on the applicable Coupon Payment Date if the Observation Value of theWorst-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 (beginning Call Feature: 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 applicableCall 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. 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 Paymentat Maturity that is equal to the Stated Principal Amount If 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 thatis 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 Underlying on 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