Preliminary Terms This summary of terms is not complete and should be read with the pricing supplement below Issuer: Citigroup Global Markets Holdings Inc. Guarantor: Citigroup Inc. Underlying index: Nasdaq - 100 Index ® (ticker: “ NDX ”) Pricing date: October 26, 2022 Valuation date: April 26, 2024 Maturity date: May 1 , 2024 CUSIP / ISIN: 17330YB74 / US17330YB745 Initial index level: The closing level on the pricing date Final index level : The closing level on the valuation date Index return: The ( i ) final index level minus the initial index level, divided by (ii) the initial index level Digital return amount: $120.00 to $130.00 per note (representing a digital return equal to 12.00% to 13.00% of the stated principal amount) (to be determined on the pricing date). Payment at Maturity: You will receive at maturity for each note you then hold: • If the final index level is greater than or equal to the initial index level: $1,000 + digital return amount • If the final index level is less than the initial index level : $1,000 All payments on the notes are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc. Stated principal amount: $1,000 per note Pricing Supplement: Preliminary Pricing Supplement dated October 17 , 2022 Citigroup Global Markets Holdings Inc. Guaranteed by Citigroup Inc. Digital Notes Linked to NDX Hypothetical Payment at Maturity Hypothetical Index Return Hypothetical Note Return Hypothetical Payment at Maturity 100.00% 12.00% $1,120.00 75.00% 12.00% $ 1,120.00 50.00% 12.00% $ 1,120.00 10.00% 12.00% $ 1,120.00 5.00% 12.00% $ 1,120.00 0.00% 12.00% $1,120.00 - 10.00% 0.00% $1,000.00 - 20.00% 0.00% $1,000.00 - 30.00 % 0.00% $1,000.00 - 40.00% 0.00% $1,000.00 - 50.00% 0.00% $1,000.00 - 100.00% 0.00% $1,000.00

Selected Risk Considerations • You may not receive any return on your investment in the notes. You will receive a positive return on your investment in the notes only if the underlying index remains the same or appreciates from the initial index level to the final index level. If the final index level is less than the initial index level, you will receive only the stated principal amount for each note you hold at maturity. • The notes do not pay interest. • Your potential return on the notes is limited. Your potential return on the notes at maturity is limited to the digital return. • Although the notes 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 underlying index declines. • You will not receive dividends or have any other rights with respect to the underlying index. • Your payment at maturity depends on the closing level of the underlying index on a single day. • The notes 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 notes and Citigroup Inc. defaults on its guarantee obligations, you may not receive anything owed to you under the notes. • Sale of the notes prior to maturity may result in a loss of principal. • The notes will not be listed on any securities exchange and you may not be able to sell them prior to maturity. • The estimated val ue of the notes on the pricing date will be less than the issue price. For more information about the estimated value of the notes, see the accompanying preliminary pricing supplement. • The value of the notes 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. Additional Information Citigroup Global Markets Holdings Inc. and Citigroup Inc. have filed registration statements (including the accompanying preliminary pricing supplement, product supplement, underlying 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, underlying supplement, prospectus supplement and prospectus in those registration statements (File Nos. 333 - 255302 and 333 - 255302 - 03) 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. Citigroup Global Markets Holdings Inc. Guaranteed by Citigroup Inc.