花旗集团美股招股说明书(2026-04-01版)

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 andExchange Commission. This preliminary pricing supplement and the accompanying product supplement, underlying supplement, prospectus supplement and prospectus are not an offerto sell these securities, nor are they soliciting an offer to buy these securities, in any state where the offer or sale is not permitted.SUBJECT TO COMPLETION, DATED APRIL 1, 2026 April, 2026Medium-Term Senior Notes, Series NPricing Supplement No. 2026-USNCH[ ]Filed Pursuant to Rule 424(b)(2)Registration Statement Nos. 333-293732 and 333-293732-02 Citigroup Global Markets Holdings ▪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 priorto maturity and the final underlying value of the worst performing underlying on the final valuation date is less than its final barrier value, you will lose 1% of the statedprincipal amount of your securities for every 1% by which its final underlying value is less than its initial underlying value.▪ 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. April 9, 2027, April 10, 2028 and April 9, 2029 (the “final valuation date”), each subject to postponement if such date is not ascheduled trading day or certain market disruption events occur Automatic earlyredemption:If, on any valuation date prior to the final valuation date, the closing value of the worst performing underlying on that valuationdate is greater than or equal to its initial underlying value, the securities will be automatically redeemed on the third business dayimmediately following that valuation date for an amount in cash per security equal to $1,000 plus the premium applicable to thatvaluation date. If the securities are automatically redeemed following any valuation date prior to the final valuation date, they willcease to be outstanding and you will not receive the premium applicable to any later valuation date. 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 underlying value: $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 underlyingvalue butgreater 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 barriervalue:$1,000 + ($1,000 × the underlying return of the worst performing underlying on the final valuation date) If the securities are not automatically redeemed prior to maturity and the final underlying value of the w