C Citigroup Inc

Citigroup Global Markets Holdings Inc. Guaranteed by Citigroup Inc. 3 Year Autocallable Market - Linked Securities Linked to NVDA Preliminary Terms This summary of terms is not complete and should be read with the preliminary pricing supplement below Citigroup Global Markets Holdings Inc. Issuer: Citigroup Inc. Guarantor: NVIDIA Corporation (ticker: “NVDA”) Underlying: January 8, 2025 Pricing date: Annually, beginning approximately one year after issuance Valuation dates: January 10, 2028 Final valuation date: January 13, 2028 Maturity date: If on any valuation date prior to the final valuation date the closing value of the underlying is greater than or equal to the initial underlying value, the securities will be automatically called for an amount equal to the principal plus the applicable premium Automatic early redemption: 9.35% per annum Premium: 17333A2D0 / US17333A2D00 CUSIP / ISIN: The closing value of the underlying on the pricing date Initial underlying value: The closing value of the underlying on the final valuation date Final underlying value: (Final underlying value - initial underlying value) / initial underlying value Underlying return: • If the final underlying value is greater than or equal to the initial underlying value: $1,000 + the premium applicable to the final valuation date • If the final underlying value is less than the initial underlying value: $1,000 All payments on the securities are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc. Payment at maturity (if not autocalled): $1,000 per security Stated principal amount: Preliminary Pricing Supplement dated December 18, 2024 Preliminary pricing supplement: Hypothetical Interim Payment per Security #99636791v1 Premium Valuation Date on which the Closing Value of the Underlying Equals or Exceeds Initial Underlying Value 9.35% January 8, 2026 18.70% January 8, 2027 If the closing value of the underlying is not greater than or equal to the initial underlying value on any interim valuation date, then the securities will not be automatically redeemed prior to maturity and you will not receive a premium following that valuation date. Hypothetical Payment at Maturity per Security Assumes the securities have not been automatically redeemed prior to maturity. Hypothetical Payment at Maturity Hypothetical Underlying Return on Final Valuation Date $1,280.50 100.00% $1,280.50 50.00% $1,280.50 25.00% $1,280.50 0.00% $1,000.00 - 0.01% $1,000.00 - 25.00% $1,000.00 - 50.00% $1,000.00 - 75.00% $1,000.00 - 100.00%

Citigroup Global Markets Holdings Inc. Guaranteed by Citigroup Inc. Selected Risk Considerations • You may not receive any return on your investment in the securities. • Your potential return on the securities is limited. • Although the securities provide for the repayment of the stated principal amount at maturity, you may nevertheless suffer a loss on your investment in real value terms if the securities are not automatically redeemed prior to maturity or if the underlying declines from the initial underlying value to the final underlying value. • The securities do not pay interest. • You will not receive dividends or have any other rights with respect to the underlying. • The securities may be automatically redeemed prior to maturity. • The securities are particularly sensitive to the volatility of the closing value of the underlying on or near the valuation dates. • The securities are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc. If Citigroup Global Markets Holdings Inc. defaults on its obligations under the securities and Citigroup Inc. defaults on its guarantee obligations, you may not receive anything owed to you under the securities. • Sale of the securities prior to maturity may result in a loss of principal. • The securities will not be listed on any securities exchange and you may not be able to sell them prior to maturity. • The estimated value of the securities on the pricing date will be less than the issue price . For more information about the estimated value of the securities, see the accompanying preliminary pricing supplement . • The value of the securities prior to maturity will fluctuate based on many unpredictable factors . • The issuer and its affiliates may have conflicts of interest with you . The above summary of selected risks does not describe all of the risks associated with an investment in the securities. You should read the accompanying preliminary pricing supplement and product supplement for a more complete description of risks relating to the securities. #99636791v1 Additional Information Citigroup Global Markets Holdings Inc. and Citigroup Inc. have filed registration statements (including the accompanying preliminary pricing supplement, product supplement, prospectus supplement and prospectus) with the Securities and Exchange Commission (“SEC”) for the offering to which this communication relates. Before you invest, you should read the accompanying preliminary pricing supplement, product supplement, prospectus supplement and prospectus in those registration statements (File Nos. 333 - 270327 and 333 - 270327 - 01) and the other documents Citigroup Global Markets Holdings Inc. and Citigroup Inc. have filed with the SEC for more complete information about Citigroup Global Markets Holdings Inc., Citigroup Inc. and this offering. You may obtain these documents without cost by visiting EDGAR on the SEC website at www.sec.gov. Alternatively, you can request these documents by calling toll - free 1 - 800 - 831 - 9146. Filed pursuant to Rule 433 This offering summary does not contain all of the material information an investor should consider before investing in the securities. This offering summary is not for distribution in isolation and must be read together with the accompanying preliminary pricing supplement and the other documents referred to therein, which can be accessed via the link on the first page.

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