Jefferies Financial Group Inc美股招股说明书(2026-04-22版)

The information in this preliminary pricing supplement is not complete and may be changed. This preliminary pricing supplement and the accompanying productsupplement, prospectus supplementandprospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdictionwhere the offer or sale is not permitted. Subject To Completion, dated April 22, 2026 PRICING SUPPLEMENT dated April, 2026(To Product Supplement No. 2 dated June 30, 2023Prospectus Supplement dated May 12, 2023and Prospectus dated May 12, 2023) Jefferies Financial Group Inc.Medium-Term Notes, Series A Market Linked Securities—Auto-Callable with Contingent DownsidePrincipal at Risk Securities Linked to the Lowest Performing of the S&P 500®Index, the Russell 2000®Index and the Dow Jones Industrial Average®due May 3, 2030■Linked to the lowest performing of the S&P 500®Index, the Russell 2000®Index and the Dow Jones Industrial Average® (each referred to as an “Index”)■Unlike ordinary debt securities, the securities do not pay interest, do not repay a fixed amount of principal at maturity and are subject to potential automatic call uponthe terms described below. Whether the securities are automatically called for a fixed call premium or, if not automatically called, the maturity payment amount, willdepend, in each case, on the closing level of the lowest performing Index on the applicable call date. The lowest performing Index on any call date is the Index that hasthe lowest closing level on that call date as a percentage of its starting level■Automatic Call.If the closing level of the lowest performing Index on any call date is greater than or equal to its starting level, the securities will be automatically called for the face amount plus the call premium applicable to that call date. The call premium applicable to each call date will be a percentage of the face amount thatincreases for each call date based on a simple (non-compounding) return of at least approximately 12.20% per annum (to be determined on the pricing date). Pleasesee "Terms of the Securities - Call Dates and Call Premiums" below for the call dates and call premiums■Potential Loss of Principal.If the securities are not automatically called prior to or at stated maturity, you will receive the face amount at stated maturity if,and onlyif, the closing level of the lowest performing Index on the final calculation day is greater than or equal to its threshold level. If the closing level of the lowest performingIndex on the final calculation day is less than its threshold level, you will lose more than 25%, and possibly all, of the face amount of your securities.■If the securities are not automatically called prior to or at stated maturity, you will have full downside exposure to the lowest performing Index from its starting level if itsclosing level on the final calculation day is less than its threshold level, but you will not participate in any appreciation of any Index and will not receive any dividendson securities included in any Index■Your return on the securities will depend solely on the performance of the Index that is the lowest performing Index on each call date. You will not benefit in any wayfrom the performance of the better performing Indices. Therefore, you will be adversely affected if any Index performs poorly, even if the other Indices performfavorably■Any positive return on the securities will be limited to the applicable call premium, even if the closing level of the lowest performing Index on the applicable call datesignificantly exceeds its starting level. You will not participate in any appreciation of the lowest performing Index beyond the applicable fixed call premium■All payments on the securities are subject to our credit risk, and you will have no ability to pursue any securities included in any Index for payment; if we default on ourobligations under the securities, you could lose some or all of your investment■No periodic interest payments or dividends■No exchange listing; designed to be held to maturity We estimate that the value of each security on the pricing date will be approximately $956.00, or within $30.00 of that estimate.Our estimate of the value of the securities asdetermined on the pricing date will be set forth in the final pricing supplement. See “Estimated Value of the Securities” in this pricing supplement.The securities have complex features and investing in the securities involves risks not associated with an investment in conventional debt securities. See “Selected RiskConsiderations” beginning on page PRS-9 herein and “Risk Factors” beginning on page PS-5 of the accompanying product supplement.The securities are senior unsecured obligations of Jefferies Financial Group Inc. and, accordingly, all payments are subject to our credit risk. If we default on our obligationsunder the securities, you could lose some or all of your investment. The securities are not savings accounts,