Jefferies Financial Group Inc美股招股说明书(2026-07-29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 July 29, 2026 PRELIMINARY PRICING SUPPLEMENT(to Product Supplement no. 1, dated May 11, 2026, Prospectus Supplement dated May 11, 2026and Prospectus dated May 11, 2026) $Jefferies Jefferies Financial Group Inc.Senior Leveraged Barrier Notes due August 17, 2029 Linked to the iShares®MSCI EAFE®ETFThe Senior Leveraged Barrier Notes due August 17, 2029 Linked to the iShares®MSCI EAFE®ETF (the “Notes”) are senior unsecured obligations of Jefferies Financial Group Inc. The Notes will pay no interest and have the terms described in the accompanying product supplement, prospectus supplement and prospectus, as supplementedor modified by this pricing supplement. At maturity, if the Underlying hasappreciatedin value, investors will receive the Stated Principal Amount of their investment plus106.00%of the upside performance of the Underlying. If the Underlying hasdepreciatedin value, but the Underlying has not declined below the Threshold Value, investors willreceive the Stated Principal Amount. However, if the Underlying has declined below the Threshold Value, investors will lose 1% of the Stated Principal Amount for every 1%decline in the Final Value below the Initial Value. Investors may lose up to 100% of the Stated Principal Amount of the Notes. The Notes are issued as part of our Series AGlobal Medium-Term Notes program.All payments are subject to our credit risk. If we default on our obligations, you could lose some or a significant portion of your investment. These Notes are not secured obligations and you will not have any security interest in, or otherwise have any access to, any Underlying or the securities represented by anyUnderlying.SUMMARY OF TERMS Issuer:Title of the Notes:Aggregate Principal Amount:Issue Price:Stated Principal Amount:Pricing Date:Original Issue Date:Valuation Date:Maturity Date:Underlying:Payment at Maturity: Jefferies Financial Group Inc.Senior Leveraged Barrier Notes due August 17, 2029 Linked to the iShares®MSCI EAFE®ETF$. 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 NoteAugust 14, 2026August 19, 2026 (3 Business Days after the Pricing Date)August 14, 2029, subject to postponement as described in the accompanying product supplement.August 17, 2029, which may be postponed if the Valuation Date is postponed as described in the accompanying product supplement.The iShares®MSCI EAFE®ETF (the “EFA”). Please see “The Underlying” below.If the Final Value is greater than the Initial Value, you will receive for each Note that you hold a Payment at Maturity equal to: Stated Principal Amount × (1+ Participation Rate × Underlying Return).If the Final Value is less than or equal to the Initial Value but greater than or equal to the Threshold Value, you will receive for each Note that you hold a Payment at Maturity that is equal to the Stated Principal Amount.If the Final Value is less than the 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:Stated Principal Amount × (1+ Underlying Return). In this scenario the Payment at Maturity will be less than the Stated Principal Amount and you could lose a significant portion or all of yourinvestment. Participation Rate:Underlying Return: Initial Value:Final Value:Threshold Value:Adjustment Factor: The ETF Closing Price of the Underlying on the Pricing Date.The ETF Closing Price of the Underlyingtimesthe Adjustment Factor on the Valuation Date.80% of the Initial Value.Initially 1.0, subject to adjustment for certain events affecting the Underlying. See “—Antidilution Adjustments for Notes with an Underlyingor Basket Component that is an ETF” in the accompanying product supplement.Not applicableU.S. dollars47234KBU7 / US47234KBU79Book-entry or Certificated Note:Book-entryNew YorkJefferies LLC, a wholly-owned subsidiary of Jefferies Financial Group Inc. See “Supplemental Plan of Distribution.”Jefferies Financial Services, Inc., a wholly owned subsidiary of Jefferies Financial Group Inc.The Bank of New York MellonApproximately $955.30 per Note, or within $30.00 of that estimate. Please see “The Notes” below. Redemption:Specified Currency:CUSIP/ISIN:Business Day:Agent:Calculation Agent:Trustee:Estimated value on the PricingDate:Use of Proceeds:Listing:Conflict of Interest: General corporate purposesNone Jefferies LLC, the broker-dealer subsidiary of Jefferies Financial Group Inc., is a member of FINRA and will participate in the distribution ofthe notes being offered hereby. Accordingly, the offering is subject to the provisi