Jefferies Financial Group Inc. 美股招股说明书（2026年3月4日版）

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. SUBJECT TO COMPLETION, DATED March 3, 2026 PRELIMINARY PRICING SUPPLEMENT(to Product Supplement no. 5, dated October 23, 2023, Prospectus Supplement dated May 12, 2023and Prospectus dated May 12, 2023) $Jefferies Jefferies Financial Group Inc.Senior Autocallable Contingent Coupon Barrier Notes due March 12, 2032 Linked to the Worst-Performing of the Dow Jones Industrial Average®, the Invesco S&P 500®Equal Weight ETF, the Russell 2000®Index and the EUROSTOXX 50®Index The Senior Autocallable Contingent Coupon Barrier Notes due March 12, 2032 Linked to the Worst-Performing of the Dow Jones Industrial Average®, the Invesco S&P 500®Equal WeightETF, the Russell 2000®Index and the EURO STOXX 50®Index (the “Notes”) are senior unsecured obligations of Jefferies Financial Group Inc. The Notes have the terms described in theaccompanying product supplement, prospectus supplement and prospectus, as supplemented or modified by this pricing supplement. The Notes are issued as part of our Series A GlobalMedium-Term Notes program. All payments are subject to our credit risk. If we default on our obligations, you could lose some or a significant portion of your investment. These Notes are not securedobligations and you will not have any security interest in, or otherwise have any access to, any Underlying or the securities represented by any Underlying.SUMMARY OF TERMS Senior Autocallable Contingent Coupon Barrier Notes due March 12, 2032 Linked to the Worst-Performing of the Dow Jones Industrial Average®,the Invesco S&P 500®Equal Weight ETF, the Russell 2000®Index and the EURO STOXX 50®Index$. We may increase the Aggregate Principal Amount prior to the Original Issue Date but are not required to do so. Aggregate Principal Amount:Issue Price:Stated Principal Amount:Pricing Date: $1,000 per Note$1,000 per NoteMarch 10, 2026March 12, 2026 (2 Business Days after the Pricing Date)Quarterly, beginning on June 10, 2026, as set forth on page PS-2. The Coupon Observation Dates are subject to postponement as described inthe 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 Coupon Payment Dates: the accompanying product supplement.Quarterly, beginning on September 10, 2026, as set forth on page PS-2. The Call Observation Dates are subject to postponement as described Call Observation Dates: in the accompanying product 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 theaccompanying product supplement.March 10, 2032, subject to postponement as described in the accompanying product supplement.March 12, 2032, which may be postponed if the Valuation Date is postponed as described in the accompanying product supplement.The worst-performing of the Dow Jones Industrial Average®(the “INDU”), the Invesco S&P 500®Equal Weight ETF (the “RSP”), the Russell2000®Index (the “RTY”) and the EURO STOXX 50®Index (the “SX5E”). Please see “The Underlyings” below.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 $25.75 on the applicable Coupon Payment Date if theObservation Value of the Worst-Performing Underlying on the applicable quarterly Coupon Observation Date is greater than or equal to itsCoupon Barrier. Valuation Date:Maturity Date: Underlying: Worst-Performing Underlying:Coupon Feature: 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 If the Final Value of the Worst-Performing Underlying is less than its Threshold Value, you will receive for each Note that you hold aPayment 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 Underlying onthe final Coupon Observation Date is greater than or equal to its Coupon Barrier.With respect to theRSP, the ETF Closing Price of the Underlying on the Pricing Date.With respect to each of theINDU, the RTY and the SX5E, the Index Closing Value of the Underlying on the Pricing Date.With respect to theRSP, the ETF Closing Price of the Underlyingtimesthe Adjustment Factor on the applicable Coupon Observat