花旗集团美股招股说明书(2026-03-19版)

March, 2026Medium-Term Senior Notes, Series NPricing Supplement No. 2026-USNCH31076 Citigroup Global Markets Holdings Inc. Autocallable Securities Linked to the Worst Performing of the Nasdaq-100 Index®and the S&P 500®Index Due March 28, 2029 The securities offered by this pricing supplement are unsecured debt securities issued by Citigroup Global Markets Holdings Inc. and guaranteed by Citigroup Inc. Unlike conventional debtsecurities, the securities do not pay interest, do not guarantee the repayment of principal at maturity and are subject to potential automatic early redemption on a periodic basis on the termsdescribed below. Your return on the securities will depend solely on the performance of theworst performingof the underlyings specified below. The securities offer the potential for automatic early redemption at a premium following the first valuation date (other than the final valuation date) on which the closing value of the worstperforming underlying on that valuation date is greater than or equal to its initial underlying value. If the securities are not automatically redeemed prior to maturity, the securities will providefor (i) repayment of the stated principal amountplusa premium at maturity if the final underlying value of the worst performing underlying on the final valuation date is greater than or equalto its initial underlying value or (ii) repayment of the stated principal amount at maturity, with no premium, if the final underlying value of the worst performing underlying on the finalvaluation date is less than its initial underlying value but greater than or equal to its final barrier value specified below.However, if the securities are not automatically redeemed prior You will be subject to risks associated with each of the underlyings and will be negatively affected by adverse movements inany one of the underlyings. Although you will have downsideexposure to the worst performing underlying on the final valuation date, you will not receive dividends with respect to any underlying or participate in any appreciation of any underlying. 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 andCitigroup Inc. default on our obligations.All payments on the securities are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc. If, on any valuation date prior to the final valuation date, the closing value of the worst performing underlying on that valuation date is greater thanor equal to its initial underlying value, the securities will be automatically redeemed on the third business day immediately following that valuationdate for an amount in cash per security equal to $1,000 plus the premium applicable to that valuation date. If the securities are automatically Payment at maturity:If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you then hold:■ If the final underlying value of the worst performing underlying on the final valuation date isgreater than or equal toits initial underlyingvalue: $1,000 + the premium applicable to the final valuation date■If the final underlying value of the worst performing underlying on the final valuation date isless thanits initial underlying value butgreaterthan or equal toits final barrier value: $1,000 If the securities are not automatically redeemed prior to maturity and the final underlying value of the worst performing underlying onthe final valuation date is less than its final barrier value, you will receive significantly less than the stated principal amount of yoursecurities, and possibly nothing, at maturity. (1) Citigroup Global Markets Holdings Inc. currently expects that the estimated value of the securities on the pricing date will be at least $912.00 per security, which will be less than the issue price. Theestimated value of the securities is based on CGMI’s proprietary pricing models and our internal funding rate. It is not an indication of actual profit to CGMI or other of our affiliates, nor is it an indication ofthe price, if any, at which CGMI or any other person may be willing to buy the securities from you at any time after issuance. See “Valuation of the Securities” in this pricing supplement. (2) CGMI will receive an underwriting fee of up to $29.50 for each security sold in this offering. The total underwriting fee and proceeds to issuer in the table above give effect to the actual totalunderwriting fee. For more information on the distribution of the securities, see “Supplemental Plan of Distribution” in this pricing supplement. In addition to the underwriting fee, CGMI and its affiliates mayprofit from expected hedging activity related to this offering, even if the value of the securities declines. See “Use of Proceeds and Hedging” in the accompanying prospectus.(3) The per security proc