花旗集团美股招股说明书(2026-03-31版)

This Amended and Restated Pricing Supplement No. 2026-USNCH31343 is being filed to reflect that there is nofee being paid to electronic platform providers.The information in this preliminary pricing supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission. This preliminary pricingsupplement and the accompanying product supplement, underlying supplement, prospectus supplement and prospectusare not an offer to sell these securities, nor are they soliciting an offer to buy these securities, in any state where the offeror sale is not permitted.SUBJECT TO COMPLETION, DATED MARCH 31, 2026Citigroup Global Markets HoldingsApril, 2026 Medium-Term Senior Notes, Series NAmended and Restated Pricing Supplement No.2026-USNCH31343Filed Pursuant to Rule 424(b)(3)Registration Statement Nos. 333-293732 and 333-293732-02Callable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of the Dow Inc. Jones Industrial AverageTM, the Russell 2000®Index and the S&P 500® ▪ The securities offered by this pricing supplement are unsecured debt securities issued by Citigroup Global MarketsHoldings Inc. and guaranteed by Citigroup Inc. The securities offer the potential for periodic contingent couponpayments at an annualized rate that, if all are paid, would produce a yield that is generally higher than the yield on ourconventional debt securities of the same maturity. In exchange for this higher potential yield, you must be willing toaccept the risks that (i) your actual yield may be lower than the yield on our conventional debt securities of the samematurity because you may not receive one or more, or any, contingent coupon payments, and (ii) the value of what youreceive at maturity may be significantly less than the stated principal amount of your securities, and may be zero. Eachof these risks will depend solely on the performance of theworst performingof the underlyings specified below.▪ We have the right to call the securities for mandatory redemption on any potential redemption date specified below. ▪ You will be subject to risks associated with each of the underlyings and will be negatively affected by adversemovements inany one of the underlyings. Although you will have downside exposure to the worst performingunderlying, you will not receive dividends with respect to any underlying or participate in any appreciation of anyunderlying.▪ Investors in the securities must be willing to accept (i) an investment that may have limited or no liquidity and (ii) the risk of not receiving any payments due under the securities if we and Citigroup Inc. default on our obligations.All paymentson the securities are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc.KEY TERMS Payment at maturity:If the securities are not redeemed prior to maturity, you will receive at maturity for each securityyou then hold (in addition to the final contingent coupon payment, if applicable): If the final underlying value of the worst performing underlying on the final valuation date isgreater than or equal toits final barrier value: $1,000If the final underlying value of the worst performing underlying on the final valuation date isless thanits final barrier value:$1,000 + ($1,000 × the underlying return of the worst performing underlying on the finalvaluation date)If the securities are not redeemed prior to maturity and the final underlying value of the (1) Citigroup Global Markets Holdings Inc. currently expects that the estimated value of the securities on the pricing date will be at least $939.50 persecurity, which will be less than the issue price. The estimated value of the securities is based on CGMI’s proprietary pricing models and our internalfunding rate. It is not an indication of actual profit to CGMI or other of our affiliates, nor is it an indication of the price, if any, at which CGMI or any otherperson may be willing to buy the securities from you at any time after issuance. See “Valuation of the Securities” in this pricing supplement.(2) For more information on the distribution of the securities, see “Supplemental Plan of Distribution” in this pricing supplement. CGMI and its affiliatesmay profit from expected hedging activity related to this offering, even if the value of the securities declines. See “Use of Proceeds and Hedging” in theaccompanying prospectus.Investing in the securities involves risks not associated with an investment in conventional debt securities. See “Summary Risk Factors” beginning on page PS-6.Neither the Securities and Exchange Commission nor any state securities commission has approved or The securities are not bank deposits and are not insured or guaranteed by the Federal Deposit InsuranceCorporation or any other governmental agency, nor are they obligations of, or guaranteed by, a bank. Additional Information The terms of the securities are set