Filed pursuant to Rule 433

Registration Statement Nos. 333-224495 and 333-224495-03

2       CitiFirst Offerings Brochure  |  September 2020    

Table of Contents

Introduction to CitiFirst Investments	4
CitiFirst Protection Investments
Market-Linked Notes Based on the Citi Dynamic Asset Selector 5 Excess Return Index (5.25 Years)	5
CitiFirst Performance Investments
Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of Target Corporation and Walmart Inc.	7
Market-Linked Notes Linked to the Citi Dynamic Asset Selector 5 Excess Return Index	9
Single Observation ELKS® Based on the Common Stock of Teladoc Health, Inc.	11
Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of the Invesco QQQ TrustSM, Series 1 and the SPDR® S&P 500® ETF Trust	13
Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of AT&T Inc. and Cisco Systems, Inc.	15
Autocallable Contingent Coupon Equity Linked Securities Linked to PayPal Holdings, Inc.	17
Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of Amazon.com, Inc. and Teladoc Health, Inc.	19
Autocallable Contingent Coupon Equity Linked Securities Linked to Amazon.com, Inc.	21
Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of Amazon.com, Inc. and Facebook, Inc.	23
Barrier Digital Plus Securities Linked to the SPDR® S&P 500® ETF Trust	25
Dual Directional Barrier Securities Linked to the SPDR® S&P 500® ETF Trust	27
Enhanced Barrier Digital Plus Securities Linked to the EURO STOXX 50® Index	29

For all offerings documented herein (other than the Market-Linked Certificates of Deposit):

    Investment Product       Not FDIC Insured         May Lose Value      No Bank Guarantee  

  CitiFirst Offerings Brochure  |  September 2020     3

Buffer Securities Linked to the Worst Performing of the SPDR® Dow Jones® Industrial AverageSM ETF Trust and the SPDR® S&P 500® ETF Trust	31
Autocallable Contingent Coupon Equity Linked Securities Linked to Amazon.com, Inc.	33
General Overview of Investments	35
Important Information for the Monthly Offerings	36
Overview of Key Benefits and Risks of CitiFirst Investments	37
Additional Considerations	38

For questions, please call your Financial Advisor

*The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

4 CitiFirst Offerings Brochure | September 2020 Introduction to CitiFirst Investments CitiFirst is the brand name for Citi’s offering of investments including notes and deposits. Tailored to meet the needs of a range of investors, CitiFirst investments are divided into three categories based on the amount of principal due at maturity: CitiFirst Protection CitiFirst Performance CitiFirst Opportunity Full principal amount due at maturity Payment due at maturity may be less Payment due at maturity may be zero than the principal amount Investments provide for the full principal Investments provide for a payment due Investments provide for a payment at amount to be due at maturity, subject at maturity, subject to the credit risk maturity, subject to the credit risk of to the credit risk of the issuer, and are of the issuer, that may be less than the the issuer, that may be zero and are for for investors who place a priority on the principal amount and in some cases may investors who are willing to take full preservation of principal while looking for be zero, and are for investors who are market risk in return for either leveraged a way to potentially outperform cash or seeking the potential for current income principal appreciation at a predetermined traditional fixed income investments and/or growth, in addition to partial or rate or access to a unique underlying contingent downside protection strategy The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment. The SEC registered securities described herein are not bank deposits but are senior, unsecured debt obligations of Citi. All returns and any principal amount due at maturity are subject to the applicable issuer credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Structured investments are not conventional debt securities. They are complex in nature and the specific terms and conditions will vary for each offering. CitiFirst operates across all asset classes meaning that underlying assets include equities, commodities, currencies, interest rates and alternative investments. When depicting a specific product, the relevant underlying asset will be shown as a symbol on the cube: Equities Commodities Currencies Rates Alternative Investments For instance, if a CitiFirst Performance investment were based upon a single stock, which belongs to an equity asset class, its symbol would be shown as follows: Classification of investments into categories is not intended to guarantee particular results or performance. Though the potential returns on structured investments are based upon the performance of the relevant underlying asset or index, investing in a structured investment is not equivalent to investing directly in the underlying asset or index.

CitiFirst Offerings Brochure | September 2020 5 Market-Linked Notes Based on the Citi Dynamic Asset Selector 5 Excess Return Index (5.25 Years) Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc Index: The Citi Dynamic Asset Selector 5 Excess Return Index (ticker symbol: “CIISDA5N”) Stated principal amount: $1,000 per note Pricing date: September 15, 2020 Issue date: September 18, 2020. See “Supplemental Plan of Distribution” in this pricing supplement for additional information. Valuation date: December 15, 2025, subject to postponement if such date is not an index business day Maturity date: December 18, 2025 Payment at maturity: For each note you hold at maturity, the $1,000 stated principal amount plus the note return amount, which will be either zero or positive Note return amount: • If the final index level is greater than the initial index level: $1,000 x the index return x upside participation rate • If the final index level is less than or equal to the initial index level: $0 Initial index level: , the closing level of the underlying index on the pricing date Final index level: The closing level of the underlying index on the valuation date Index return: The percentage change in the closing level of the Index from the pricing date to the valuation date, calculated as follows: (i) final index level minus initial index level, divided by (ii) initial index level Upside participation rate: 100% Listing: The notes will not be listed on any securities exchange CUSIP: 17328WC71 For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

6 CitiFirst Offerings Brochure | September 2020 Investor Profile Investor Seeks: Investor Can Accept: â– A medium-term equity index-linked investment â– A holding period of approximately 5.25 years â–Full principal amount due at maturity â–The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 7 Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of Target Corporation and Walmart Inc. Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlyings: Initial underlying Coupon barrier Final barrier Equity ratio*** Underlying value* value** value** Target Corporation $ $ $ Walmart Inc. $ $ $ * For each underlying, its closing value on the pricing date ** For each underlying, 75.00% of its initial underlying value *** For each underlying, the stated principal amount divided by its initial underlying value Stated principal amount: $1,000 per security Pricing date: September 3, 2020 Issue date: September 9, 2020 Valuation dates: December 3, 2020, March 3, 2021, June 3, 2021 and September 3, 2021 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: Unless earlier redeemed, September 9, 2021 Contingent coupon payment The fifth business day after each valuation date, except that the contingent coupon payment date dates: following the final valuation date will be the maturity date Contingent coupon: On each contingent coupon payment date, unless previously redeemed, the securities will pay a On each contingent coupon payment date, unless previously redeemed, the securities will pay a contingent coupon equal to at least 2.25% of the stated principal amount of the securities (equivalent to a contingent coupon rate of at least 9.00% per annum) (to be determined on the pricing date) if and only if the closing value of the worst performing underlying on the immediately preceding valuation date is greater than or equal to its coupon barrier value. If the closing value of the worst performing underlying on any valuation date is less than its coupon barrier value, you will not receive any contingent coupon payment on the immediately following contingent coupon payment date. If the closing value of the worst performing underlying on one or more valuation dates is less than its coupon barrier value and, on a subsequent valuation date, the closing value of the worst performing underlying on that subsequent valuation date is greater than or equal to its coupon barrier value, your contingent coupon payment for that subsequent valuation date will include all previously unpaid contingent coupon payments (without interest on amounts previously unpaid). However, if the closing value of the worst performing underlying on a valuation date is less than its coupon barrier value and the closing value of the worst performing underlying on each subsequent valuation date up to and including the final valuation date is less than its coupon barrier value, you will not receive the unpaid contingent coupon payments in respect of those valuation dates. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

8 CitiFirst Offerings Brochure | September 2020 Payment at maturity: If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you 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 is greater than or equal to its final barrier value: $1,000 • If the final underlying value of the worst performing underlying on the final valuation date is less than its final barrier value: a fixed number of underlying shares of the worst performing underlying on the final valuation date equal to its equity ratio (or, if we elect, the cash value of those shares based on its final underlying value) If the securities are not automatically redeemed prior to 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 receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity, and you will not receive any contingent coupon payment at maturity (including any previously unpaid contingent coupon payments). Listing: The securities will not be listed on any securities exchange Underwriter: Citigroup Global Markets Inc. (“CGMI”), an affiliate of the issuer, acting as principal Automatic early redemption: If, on any potential autocall date, the closing value of the worst performing underlying on that potential autocall date is greater than or equal to its initial underlying value, each security you then hold will be automatically called on that potential autocall date for redemption on the immediately following contingent coupon payment date for an amount in cash equal to $1,000 plus the related contingent coupon payment. The automatic early redemption feature may significantly limit your potential return on the securities. If the worst performing underlying performs in a way that would otherwise be favorable, the securities are likely to be automatically called for redemption prior to maturity, cutting short your opportunity to receive contingent coupon payments. The securities may be automatically called for redemption as early as the first potential autocall date specified below. Potential autocall dates: The valuation dates scheduled to occur on December 3, 2020, March 3, 2021 and June 3, 2021 Final underlying value: For each underlying, its closing value on the final valuation date Worst performing For any valuation date, the underlying with the lowest underlying return determined as of that valuation underlying: date Underlying return: For each underlying on any valuation date, (i) its closing value on that valuation date minus its initial underlying value, divided by (ii) its initial underlying value CUSIP: 17324X2C3 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 9 Market-Linked Notes Linked to the Citi Dynamic Asset Selector 5 Excess Return Index Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Index: Market-Linked Notes Linked to the Citi Dynamic Asset Selector 5 Excess Return Index Stated principal amount: $1,000 per security Pricing date: September 8, 2020 Issue date: September 11, 2020. See “Supplemental Plan of Distribution” in this pricing supplement for additional information. Valuation date: March 8, 2024, subject to postponement if such date is not an index business day Maturity date: March 13, 2024 Payment at maturity: For each $1,000 stated principal amount note you hold at maturity, you will receive an amount in cash determined as follows: • If the final index level is greater than the initial index level: $1,000 + ($1,000 x the index return x the upside participation rate) • If the final index level is less than or equal to the initial index level: $1,000 + ($1,000 x the index return), subject to the maximum loss at maturity If the final index level depreciates from the initial index level, you will be exposed to that depreciation up to the maximum loss at maturity. You should not invest in the notes unless you are willing and able to bear the risk of losing up to the maximum loss at maturity Initial index level: , the closing level of the Index on the pricing date Final index level: The closing level of the Index on the valuation date Maximum loss at maturity: $50 per note (5% of the stated principal amount) Upside participation rate: At least 100%. The actual upside participation rate will be determined on the pricing date. Index return: (i) The final index level minus the initial index level, divided by (ii) the initial index level Listing: The notes will not be listed on any securities exchange CUSIP: 17328WFH6 For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

10 CitiFirst Offerings Brochure | September 2020 Investor Profile Investor Seeks: Investor Can Accept: â– A medium-term equity-linked investment â– A holding period of approximately 3.5 years â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 11 Single Observation ELKS® Based on the Common Stock of Teladoc Health, Inc. Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlying shares: Shares of common stock of Teladoc Health, Inc. (NYSE symbol: “TDOC”) (the “underlying share issuer”) Stated principal amount: $1,000 per security Pricing date: September 11, 2020 Issue date: September 16, 2020 Valuation date: September 13, 2021, subject to postponement if such date is not a scheduled trading day or if certain market disruption events occur Maturity date: September 16, 2021 Coupon: At least 12.00% per annum. The actual coupon rate will be determined on the pricing date. Coupon payment dates: October 16, 2020, November 16, 2020, December 16, 2020, January 19, 2021, February 16, 2021, March 16, 2021, April 16, 2021, May 17, 2021, June 16, 2021, July 16, 2021, August 16, 2021 and the maturity date Payment at maturity: For each $1,000 security you hold at maturity, you will be entitled to receive the final coupon payment plus: • If a downside event occurs: a number of underlying shares equal to the equity ratio (or, in our sole discretion, cash in an amount equal to the equity ratio multiplied by the final share price) • If a downside event does not occur: $1,000 in cash If a downside event occurs, you will not receive the stated principal amount of your securities at maturity and, instead, will receive underlying shares (or, in our sole discretion, cash based on the value thereof) expected to be worth less than 80.00% of the stated principal amount and may be worth nothing. Although you are expected to be subject to the risk of a decline in the price of the underlying shares, you will not participate in any appreciation of the underlying shares over the term of the securities. The number of full underlying shares and any cash in lieu of a fractional underlying share that you receive at maturity will be calculated based on the aggregate number of securities you then hold. Downside event: A downside event will occur if the final share price is less than the downside threshold price Downside threshold price: $ , 60.00% of the initial share price Initial share price: $ , the closing price of the underlying shares on the pricing date Final share price: The closing price of the underlying shares on the valuation date Equity ratio: , the stated principal amount divided by the initial share price Listing: The securities will not be listed on any securities exchange CUSIP: 17324X2B5 For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

12 CitiFirst Offerings Brochure | September 2020 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 13 Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of the Invesco QQQ TrustSM, Series 1 and the SPDR® S&P 500® ETF Trust Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlyings: Initial underlying Coupon barrier Final barrier Equity ratio*** Underlying value* value** value** Invesco QQQ TrustSM, $ $ $ Series 1 SPDR® S&P 500® ETF $ $ $ Trust * For each underlying, its closing value on the pricing date ** For each underlying, 75.00% of its initial underlying value *** For each underlying, the stated principal amount divided by its initial underlying value Stated principal amount: $1,000 per security Pricing date: September 14, 2020 Issue date: September 17, 2020 Valuation dates: December 14, 2020, March 15, 2021, June 14, 2021 and September 14, 2021 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: Unless earlier redeemed, September 17, 2021 Contingent coupon payment The fifth business day after each valuation date, except that the contingent coupon payment date dates: following the final valuation date will be the maturity date Contingent coupon: On each contingent coupon payment date, unless previously redeemed, the securities will pay a contingent coupon equal to at least 2.00% of the stated principal amount of the securities (equivalent to a contingent coupon rate of at least 8.00% per annum) (to be determined on the pricing date) if and only if the closing value of the worst performing underlying on the immediately preceding valuation date is greater than or equal to its coupon barrier value. If the closing value of the worst performing underlying on any valuation date is less than its coupon barrier value, you will not receive any contingent coupon payment on the immediately following contingent coupon payment date. If the closing value of the worst performing underlying on one or more valuation dates is less than its coupon barrier value and, on a subsequent valuation date, the closing value of the worst performing underlying on that subsequent valuation date is greater than or equal to its coupon barrier value, your contingent coupon payment for that subsequent valuation date will include all previously unpaid contingent coupon payments (without interest on amounts previously unpaid). However, if the closing value of the worst performing underlying on a valuation date is less than its coupon barrier value and the closing value of the worst performing underlying on each subsequent valuation date up to and including the final valuation date is less than its coupon barrier value, you will not receive the unpaid contingent coupon payments in respect of those valuation dates. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

14 CitiFirst Offerings Brochure | September 2020 Payment at maturity: If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you then hold (in addition to the final contingent coupon payment, if applicable): • IIf the final underlying value of the worst performing underlying on the final valuation date is greater than or equal to its final barrier value: $1,000 • If the final underlying value of the worst performing underlying on the final valuation date is less than its final barrier value: a fixed number of underlying shares of the worst performing underlying on the final valuation date equal to its equity ratio (or, if we elect, the cash value of those shares based on its final underlying value)e) If the securities are not automatically redeemed prior to 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 receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity, and you will not receive any contingent coupon payment at maturity (including any previously unpaid contingent coupon payments). Listing: The securities will not be listed on any securities exchange Underwriter: Citigroup Global Markets Inc. (“CGMI”), an affiliate of the issuer, acting as principal Automatic early redemption: If, on any potential autocall date, the closing value of the worst performing underlying on that potential autocall date is greater than or equal to its initial underlying value, each security you then hold will be automatically called on that potential autocall date for redemption on the immediately following contingent coupon payment date for an amount in cash equal to $1,000 plus the related contingent coupon payment. The automatic early redemption feature may significantly limit your potential return on the securities. If the worst performing underlying performs in a way that would otherwise be favorable, the securities are likely to be automatically called for redemption prior to maturity, cutting short your opportunity to receive contingent coupon payments. The securities may be automatically called for redemption as early as the first potential autocall date specified below. Potential autocall dates: The valuation dates scheduled to occur on December 14, 2020, March 15, 2021 and June 14, 2021 Final underlying value: For each underlying, its closing value on the final valuation date Worst performing For any valuation date, the underlying with the lowest underlying return determined as of that valuation underlying: date Underlying return: For each underlying on any valuation date, (i) its closing value on that valuation date minus its initial underlying value, divided by (ii) its initial underlying value CUSIP: 17324XX54 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 15 Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of AT&T Inc. and Cisco Systems, Inc. Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlyings: Initial underlying Coupon barrier Final barrier Equity ratio*** Underlying value* value** value** AT&T Inc. $ $ $ Cisco Systems, Inc. $ $ $ * For each underlying, its closing value on the pricing date ** For each underlying, 75.00% of its initial underlying value *** For each underlying, the stated principal amount divided by its initial underlying value Stated principal amount: $1,000 per security Pricing date: September 14, 2020 Issue date: September 17, 2020 Valuation dates: December 14, 2020, March 15, 2021, June 14, 2021 and September 14, 2021 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: Unless earlier redeemed, September 17, 2021 Contingent coupon payment The fifth business day after each valuation date, except that the contingent coupon payment date dates: following the final valuation date will be the maturity date Contingent coupon: On each contingent coupon payment date, unless previously redeemed, the securities will pay a contingent coupon equal to at least 2.25% of the stated principal amount of the securities (equivalent to a contingent coupon rate of at least 9.00% per annum) (to be determined on the pricing date) if and only if the closing value of the worst performing underlying on the immediately preceding valuation date is greater than or equal to its coupon barrier value. If the closing value of the worst performing underlying on any valuation date is less than its coupon barrier value, you will not receive any contingent coupon payment on the immediately following contingent coupon payment date. If the closing value of the worst performing underlying on one or more valuation dates is less than its coupon barrier value and, on a subsequent valuation date, the closing value of the worst performing underlying on that subsequent valuation date is greater than or equal to its coupon barrier value, your contingent coupon payment for that subsequent valuation date will include all previously unpaid contingent coupon payments (without interest on amounts previously unpaid). However, if the closing value of the worst performing underlying on a valuation date is less than its coupon barrier value and the closing value of the worst performing underlying on each subsequent valuation date up to and including the final valuation date is less than its coupon barrier value, you will not receive the unpaid contingent coupon payments in respect of those valuation dates. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

16 CitiFirst Offerings Brochure | September 2020 Payment at maturity: If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you then hold (in addition to the final contingent coupon payment, if applicable): • IIf the final underlying value of the worst performing underlying on the final valuation date is greater than or equal to its final barrier value: $1,000 • If the final underlying value of the worst performing underlying on the final valuation date is less than its final barrier value: a fixed number of underlying shares of the worst performing underlying on the final valuation date equal to its equity ratio (or, if we elect, the cash value of those shares based on its final underlying value)e) If the securities are not automatically redeemed prior to 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 receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity, and you will not receive any contingent coupon payment at maturity (including any previously unpaid contingent coupon payments). Listing: The securities will not be listed on any securities exchange Underwriter: Citigroup Global Markets Inc. (“CGMI”), an affiliate of the issuer, acting as principal Automatic early redemption: If, on any potential autocall date, the closing value of the worst performing underlying on that potential autocall date is greater than or equal to its initial underlying value, each security you then hold will be automatically called on that potential autocall date for redemption on the immediately following contingent coupon payment date for an amount in cash equal to $1,000 plus the related contingent coupon payment. The automatic early redemption feature may significantly limit your potential return on the securities. If the worst performing underlying performs in a way that would otherwise be favorable, the securities are likely to be automatically called for redemption prior to maturity, cutting short your opportunity to receive contingent coupon payments. The securities may be automatically called for redemption as early as the first potential autocall date specified below. Potential autocall dates: The valuation dates scheduled to occur on December 14, 2020, March 15, 2021 and June 14, 2021 Final underlying value: For each underlying, its closing value on the final valuation date Worst performing For any valuation date, the underlying with the lowest underlying return determined as of that valuation underlying: date Underlying return: For each underlying on any valuation date, (i) its closing value on that valuation date minus its initial underlying value, divided by (ii) its initial underlying value CUSIP: 17324X2M1 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 17 Autocallable Contingent Coupon Equity Linked Securities Linked to PayPal Holdings, Inc. Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlying: PayPal Holdings, Inc. Stated principal amount: $1,000 per security Pricing date: September 21, 2020 Issue date: September 24, 2020 Valuation date: December 21, 2020, March 22, 2021, June 21, 2021 and September 21, 2021 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: Unless earlier redeemed, September 24, 2021 Contingent coupon payment The fifth business day after each valuation date, except that the contingent coupon payment date dates: following the final valuation date will be the maturity date Contingent coupon: On each contingent coupon payment date, unless previously redeemed, the securities will pay a contingent coupon equal to at least 2.25% of the stated principal amount of the securities (equivalent to a contingent coupon rate of at least 9.00% per annum) (to be determined on the pricing date) if and only if the closing value of the worst performing underlying on the immediately preceding valuation date is greater than or equal to its coupon barrier value. If the closing value of the worst performing underlying on any valuation date is less than its coupon barrier value, you will not receive any contingent coupon payment on the immediately following contingent coupon payment date. If the closing value of the worst performing underlying on one or more valuation dates is less than its coupon barrier value and, on a subsequent valuation date, the closing value of the worst performing underlying on that subsequent valuation date is greater than or equal to its coupon barrier value, your contingent coupon payment for that subsequent valuation date will include all previously unpaid contingent coupon payments (without interest on amounts previously unpaid). However, if the closing value of the worst performing underlying on a valuation date is less than its coupon barrier value and the closing value of the worst performing underlying on each subsequent valuation date up to and including the final valuation date is less than its coupon barrier value, you will not receive the unpaid contingent coupon payments in respect of those valuation dates. Payment at maturity: If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you then hold (in addition to the final contingent coupon payment, if applicable): • I If the final underlying value is greater than or equal to the final barrier value: $1,000 • If the final underlying value is less than the final barrier value: a fixed number of underlying shares of the underlying equal to the equity ratio (or, if we elect, the cash value of those shares based on the final underlying value) If the securities are not automatically redeemed prior to maturity and the final underlying value is less than the final barrier value, you will receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity, and you will not receive any contingent coupon payment at maturity (including any previously unpaid contingent coupon payments). Initial underlying value: $ , the closing value of the underlying on the pricing date For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

18 CitiFirst Offerings Brochure | September 2020 Final underlying value: The closing value of the underlying on the valuation date Coupon barrier value: $ , 75.00% of the initial underlying value Final barrier value: $ , 75.00% of the initial underlying value Automatic early redemption: If, on any potential autocall date, the closing value of the worst performing underlying on that potential autocall date is greater than or equal to its initial underlying value, each security you then hold will be automatically called on that potential autocall date for redemption on the immediately following contingent coupon payment date for an amount in cash equal to $1,000 plus the related contingent coupon payment. The automatic early redemption feature may significantly limit your potential return on the securities. If the worst performing underlying performs in a way that would otherwise be favorable, the securities are likely to be automatically called for redemption prior to maturity, cutting short your opportunity to receive contingent coupon payments. The securities may be automatically called for redemption as early as the first potential autocall date specified below. Potential autocall dates: The valuation dates scheduled to occur on December 21, 2020, March 22, 2021 and June 21, 2021 CUSIP: 17324X2E9 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 19 Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of Amazon.com, Inc. and Teladoc Health, Inc. Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlyings: Initial underlying Coupon barrier Final barrier Equity ratio*** Underlying value* value** value** Amazon.com, Inc. $ $ $ Teladoc Health, Inc $ $ $ * For each underlying, its closing value on the pricing date ** For each underlying, 50.00% of its initial underlying value *** For each underlying, the stated principal amount divided by its initial underlying value Stated principal amount: $5,000 per security Pricing date: September 22, 2020 Issue date: September 25, 2020 Valuation dates: December 22, 2020, March 22, 2021, June 22, 2021 and September 22, 2021 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: Unless earlier redeemed, September 27, 2021 Contingent coupon payment The fifth business day after each valuation date, except that the contingent coupon payment date dates: following the final valuation date will be the maturity date Contingent coupon: On each contingent coupon payment date, unless previously redeemed, the securities will pay a contingent coupon equal to at least 2.50% of the stated principal amount of the securities (equivalent to a contingent coupon rate of at least 10.00% per annum) (to be determined on the pricing date) if and only if the closing value of the worst performing underlying on the immediately preceding valuation date is greater than or equal to its coupon barrier value. If the closing value of the worst performing underlying on any valuation date is less than its coupon barrier value, you will not receive any contingent coupon payment on the immediately following contingent coupon payment date. If the closing value of the worst performing underlying on one or more valuation dates is less than its coupon barrier value and, on a subsequent valuation date, the closing value of the worst performing underlying on that subsequent valuation date is greater than or equal to its coupon barrier value, your contingent coupon payment for that subsequent valuation date will include all previously unpaid contingent coupon payments (without interest on amounts previously unpaid). However, if the closing value of the worst performing underlying on a valuation date is less than its coupon barrier value and the closing value of the worst performing underlying on each subsequent valuation date up to and including the final valuation date is less than its coupon barrier value, you will not receive the unpaid contingent coupon payments in respect of those valuation dates. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

20 CitiFirst Offerings Brochure | September 2020 Payment at maturity: If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you 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 is greater than or equal to its final barrier value: $5,000 • If the final underlying value of the worst performing underlying on the final valuation date is less than its final barrier value: a fixed number of underlying shares of the worst performing underlying on the final valuation date equal to its equity ratio (or, if we elect, the cash value of those shares based on its final underlying value) If the securities are not automatically redeemed prior to 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 receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity, and you will not receive any contingent coupon payment at maturity (including any previously unpaid contingent coupon payments). Listing: The securities will not be listed on any securities exchange Underwriter: Citigroup Global Markets Inc. (“CGMI”), an affiliate of the issuer, acting as principal Automatic early redemption: If, on any potential autocall date, the closing value of the worst performing underlying on that potential autocall date is greater than or equal to its initial underlying value, each security you then hold will be automatically called on that potential autocall date for redemption on the immediately following contingent coupon payment date for an amount in cash equal to $1,000 plus the related contingent coupon payment. The automatic early redemption feature may significantly limit your potential return on the securities. If the worst performing underlying performs in a way that would otherwise be favorable, the securities are likely to be automatically called for redemption prior to maturity, cutting short your opportunity to receive contingent coupon payments. The securities may be automatically called for redemption as early as the first potential autocall date specified below. Potential autocall dates: The valuation dates scheduled to occur on December 22, 2020, March 22, 2021 and June 22, 2021 Final underlying value: For each underlying, its closing value on the final valuation date Worst performing For any valuation date, the underlying with the lowest underlying return determined as of that valuation underlying: date Underlying return: For each underlying on any valuation date, (i) its closing value on that valuation date minus its initial underlying value, divided by (ii) its initial underlying value CUSIP: 17324XX96 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 21 Autocallable Contingent Coupon Equity Linked Securities Linked to Amazon.com, Inc. Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlying: Amazon.com, Inc. Stated principal amount: $5,000 per security Pricing date: September 23, 2020 Issue date: September 28, 2020 Valuation date: December 23, 2020, March 23, 2021, June 23, 2021 and September 23, 2021 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: Unless earlier redeemed, September 28, 2021 Contingent coupon payment The fifth business day after each valuation date, except that the contingent coupon payment date dates: following the final valuation date will be the maturity date Contingent coupon: On each contingent coupon payment date, unless previously redeemed, the securities will pay a contingent coupon equal to at least 2.00% of the stated principal amount of the securities (equivalent to a contingent coupon rate of at least 8.00% per annum) (to be determined on the pricing date) if and only if the closing value of the worst performing underlying on the immediately preceding valuation date is greater than or equal to its coupon barrier value. If the closing value of the worst performing underlying on any valuation date is less than its coupon barrier value, you will not receive any contingent coupon payment on the immediately following contingent coupon payment date. If the closing value of the worst performing underlying on one or more valuation dates is less than its coupon barrier value and, on a subsequent valuation date, the closing value of the worst performing underlying on that subsequent valuation date is greater than or equal to its coupon barrier value, your contingent coupon payment for that subsequent valuation date will include all previously unpaid contingent coupon payments (without interest on amounts previously unpaid). However, if the closing value of the worst performing underlying on a valuation date is less than its coupon barrier value and the closing value of the worst performing underlying on each subsequent valuation date up to and including the final valuation date is less than its coupon barrier value, you will not receive the unpaid contingent coupon payments in respect of those valuation dates. Payment at maturity: If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you then hold (in addition to the final contingent coupon payment, if applicable): • I If the final underlying value is greater than or equal to the final barrier value: $5,000 • If the final underlying value is less than the final barrier value: a fixed number of underlying shares of the underlying equal to the equity ratio (or, if we elect, the cash value of those shares based on the final underlying value) If the securities are not automatically redeemed prior to maturity and the final underlying value is less than the final barrier value, you will receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity, and you will not receive any contingent coupon payment at maturity (including any previously unpaid contingent coupon payments). Initial underlying value: $ , the closing value of the underlying on the pricing date For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

22 CitiFirst Offerings Brochure | September 2020 Final underlying value: The closing value of the underlying on the valuation date Coupon barrier value: $ , 74.00% of the initial underlying value Final barrier value: $ , 74.00% of the initial underlying value Automatic early redemption: If, on any potential autocall date, the closing value of the worst performing underlying on that potential autocall date is greater than or equal to its initial underlying value, each security you then hold will be automatically called on that potential autocall date for redemption on the immediately following contingent coupon payment date for an amount in cash equal to $5,000 plus the related contingent coupon payment. The automatic early redemption feature may significantly limit your potential return on the securities. If the worst performing underlying performs in a way that would otherwise be favorable, the securities are likely to be automatically called for redemption prior to maturity, cutting short your opportunity to receive contingent coupon payments. The securities may be automatically called for redemption as early as the first potential autocall date specified below. Potential autocall dates: The valuation dates scheduled to occur on December 23, 2020, March 23, 2021 and June 23, 2021 CUSIP: 17324XX39 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 23 Autocallable Contingent Coupon Equity Linked Securities Linked to the Worst Performing of Amazon.com, Inc. and Facebook, Inc. Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlyings: Initial underlying Coupon barrier Final barrier Equity ratio*** Underlying value* value** value** Amazon.com, Inc. $ $ $ Facebook, Inc. $ $ $ * For each underlying, its closing value on the pricing date ** For each underlying, 70.00% of its initial underlying value *** For each underlying, the stated principal amount divided by its initial underlying value Stated principal amount: $5,000 per security Pricing date: September 23, 2020 Issue date: September 28, 2020 Valuation dates: December 23, 2020, March 23, 2021, June 23, 2021 and September 23, 2021 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: Unless earlier redeemed, September 28, 2021 Contingent coupon payment The fifth business day after each valuation date, except that the contingent coupon payment date dates: following the final valuation date will be the maturity date Contingent coupon: On each contingent coupon payment date, unless previously redeemed, the securities will pay a contingent coupon equal to at least 2.50% of the stated principal amount of the securities (equivalent to a contingent coupon rate of at least 10.00% per annum) (to be determined on the pricing date) if and only if the closing value of the worst performing underlying on the immediately preceding valuation date is greater than or equal to its coupon barrier value. If the closing value of the worst performing underlying on any valuation date is less than its coupon barrier value, you will not receive any contingent coupon payment on the immediately following contingent coupon payment date. If the closing value of the worst performing underlying on one or more valuation dates is less than its coupon barrier value and, on a subsequent valuation date, the closing value of the worst performing underlying on that subsequent valuation date is greater than or equal to its coupon barrier value, your contingent coupon payment for that subsequent valuation date will include all previously unpaid contingent coupon payments (without interest on amounts previously unpaid). However, if the closing value of the worst performing underlying on a valuation date is less than its coupon barrier value and the closing value of the worst performing underlying on each subsequent valuation date up to and including the final valuation date is less than its coupon barrier value, you will not receive the unpaid contingent coupon payments in respect of those valuation dates. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

24 CitiFirst Offerings Brochure | September 2020 Payment at maturity: If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you 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 is greater than or equal to its final barrier value: $5,000 • If the final underlying value of the worst performing underlying on the final valuation date is less than its final barrier value: a fixed number of underlying shares of the worst performing underlying on the final valuation date equal to its equity ratio (or, if we elect, the cash value of those shares based on its final underlying value)e) If the securities are not automatically redeemed prior to 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 receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity, and you will not receive any contingent coupon payment at maturity (including any previously unpaid contingent coupon payments). Listing: The securities will not be listed on any securities exchange Underwriter: Citigroup Global Markets Inc. (“CGMI”), an affiliate of the issuer, acting as principal Automatic early redemption: If, on any potential autocall date, the closing value of the worst performing underlying on that potential autocall date is greater than or equal to its initial underlying value, each security you then hold will be automatically called on that potential autocall date for redemption on the immediately following contingent coupon payment date for an amount in cash equal to $5,000 plus the related contingent coupon payment. The automatic early redemption feature may significantly limit your potential return on the securities. If the worst performing underlying performs in a way that would otherwise be favorable, the securities are likely to be automatically called for redemption prior to maturity, cutting short your opportunity to receive contingent coupon payments. The securities may be automatically called for redemption as early as the first potential autocall date specified below. Potential autocall dates: The valuation dates scheduled to occur on December 23, 2020, March 23, 2021 and June 23, 2021 Final underlying value: For each underlying, its closing value on the final valuation date Worst performing For any valuation date, the underlying with the lowest underlying return determined as of that valuation underlying: date Underlying return: For each underlying on any valuation date, (i) its closing value on that valuation date minus its initial underlying value, divided by (ii) its initial underlying value CUSIP: 17324XY87 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 25 Barrier Digital Plus Securities Linked to the SPDR® S&P 500® ETF Trust Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlying: The SPDR® S&P 500® ETF Trust Stated principal amount: $1,000 per security Pricing date: September 23, 2020 Issue date: September 28, 2020 Valuation date: September 23, 2025, subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: September 26, 2025 Payment at maturity: You will receive at maturity for each security you then hold: • If the final underlying value is greater than or equal to the initial underlying value: $1,000 + the greater of (i) the digital return amount and (ii) $1,000 x the underlying return • If the final underlying value is less than the initial underlying value but greater than or equal to the final barrier value: $1,000 • If the final underlying value is less than the final barrier value: a fixed number of underlying shares of the underlying equal to the equity ratio (or, if we elect, the cash value of those shares based on the final underlying value) If the final underlying value is less than the final barrier value, you will receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity Initial underlying value: , the closing value of the underlying on the pricing date Final underlying value: The closing value of the underlying on the valuation date Final barrier value: , 80.00% of the initial underlying value Equity ratio: , the stated principal amount divided by the initial underlying value Digital return amount: At least $180.00 per security (representing a digital return equal to at least 18.00% of the stated principal amount) (to be determined on the pricing date). You will receive the digital return amount only if the final underlying value is greater than or equal to the initial underlying value. Underlying return: (i) The final underlying value minus the initial underlying value, divided by (ii) the initial underlying value Listing: The securities will not be listed on any securities exchange CUSIP: 17324X2T6 For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

26 CitiFirst Offerings Brochure | September 2020 Investor Profile Investor Seeks: Investor Can Accept: â– A medium-term equity-linked investment â– A holding period of approximately five years â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 27 Dual Directional Barrier Securities Linked to the SPDR® S&P 500® ETF Trust Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlying: The SPDR® S&P 500® ETF Trust Stated principal amount: $1,000 per security Pricing date: September 23, 2020 Issue date: September 28, 2020 Valuation date: March 25, 2024, subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: March 28, 2024 Payment at maturity: You will receive at maturity for each security you then hold: • If the final underlying value is greater than or equal to the initial underlying value: $1,000 + the upside return amount, subject to the maximum upside return • If the final underlying value is less than the initial underlying value but greater than or equal to the final barrier value: $1,000 + the absolute return amount • If the final underlying value is less than the final barrier value: a fixed number of underlying shares of the underlying equal to the equity ratio (or, if we elect, the cash value of those shares based on the final underlying value) If the final underlying value is less than the final barrier value, you will receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity Initial underlying value: , the closing value of the underlying on the pricing date Final underlying value: The closing value of the underlying on the valuation date Upside return amount: $1,000 x the underlying return x the upside participation rate Upside participation rate: 100% Absolute return amount: $1,000 x the absolute value of the underlying return Equity ratio: , the stated principal amount divided by the initial underlying value Underlying return: (i) The final underlying value minus the initial underlying value, divided by (ii) the initial underlying value Final barrier value: $ , 75% of the initial underlying value Maximum upside return: The maximum upside return will be determined on the pricing date and will be equal to at least $270 per security (at least 27% of the stated principal amount). Listing: The securities will not be listed on any securities exchange CUSIP: 17324XW22 For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

28 CitiFirst Offerings Brochure | September 2020 Investor Profile Investor Seeks: Investor Can Accept: â– A medium-term equity-linked investment â– A holding period of approximately 3.5 years â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 29 Enhanced Barrier Digital Plus Securities Linked to the EURO STOXX 50® Index Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlying: The EURO STOXX 50® Index Stated principal amount: $1,000 per security Pricing date: September 24, 2020 Issue date: September 29, 2020 Valuation date: September 24, 2025, subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: September 29, 2025 Payment at maturity: You will receive at maturity for each security you then hold: • If the final underlying value is greater than or equal to the final barrier value: $1,000 + the greater of (i) the digital return amount and (ii) $1,000 x the underlying return • If the final underlying value is less than the final barrier value: $1,000 + ($1,000 x the underlying return) If the final underlying value is less than the final barrier value, you will receive significantly less than the stated principal amount of your securities, and possibly nothing, at maturity. Initial underlying value: , the closing value of the underlying on the pricing date Final underlying value: The closing value of the underlying on the valuation date Final barrier value: , 80.00% of the initial underlying value Digital return amount: At least $200.00 per security (representing a digital return equal to at least 20.00% of the stated principal amount) (to be determined on the pricing date). You will receive the digital return amount only if the final underlying value is greater than or equal to the final barrier value. Underlying return: (i) The final underlying value minus the initial underlying value, divided by (ii) the initial underlying value Listing: The securities will not be listed on any securities exchange CUSIP: 17328WAQ1 For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

30 CitiFirst Offerings Brochure | September 2020 Investor Profile Investor Seeks: Investor Can Accept: â– A medium-term equity-linked investment â– A holding period of approximately five years â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 31 Buffer Securities Linked to the Worst Performing of the SPDR® Dow Jones® Industrial AverageSM ETF Trust and the SPDR® S&P 500® ETF Trust Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlyings: Underlying Initial underlying value* Final buffer value** Equity ratio*** SPDR® Dow Jones® Indust $ $ AverageSM ETF Trust SPDR® S&P 500® ETF Trust $ $ * For each underlying, its closing value on the pricing date ** For each underlying, 90.00% of its initial underlying value *** For each underlying, the stated principal amount divided by its initial underlying value Stated principal amount: $1,000 per security Pricing date: September 25, 2020 Issue date: September 30, 2020 Valuation dates: September 25, 2023, subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: September 28, 2023 Payment at maturity: You will receive at maturity for each security you then hold: • If the final underlying value of the worst performing underlying is greater than its initial underlying value: $1,000 + the return amount, subject to the maximum return at maturity • If the final underlying value of the worst performing underlying is less than or equal to its initial underlying value but greater than or equal to its final buffer value: $1,000 • If the final underlying value of the worst performing underlying is less than its final buffer value: a fixed number of underlying shares of the worst performing underlying equal to its equity ratio (or, if we elect, the cash value of those shares based on its final underlying value) + the cash buffer If the final underlying value of the worst performing underlying is less than its final buffer value, which means that the worst performing underlying has depreciated from its initial underlying value by more than the buffer percentage, you will receive underlying shares of the worst performing underlying (or, in our sole discretion, cash) and a cash buffer at maturity that together will be worth less than the stated principal amount of your securities. Final underlying value: For each underlying, its closing value on the final valuation date Return amount: $1,000 x the underlying return of the worst performing underlying x the upside participation rate Upside participation rate: 100.00% For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

32 CitiFirst Offerings Brochure | September 2020 Worst performing The underlying with the lowest underlying return underlying: Underlying return: For each underlying on any valuation date, (i) its closing value on that valuation date minus its initial underlying value, divided by (ii) its initial underlying value Maximum return at maturity: $400.00 per security (40.00% of the stated principal amount). The payment at maturity per security will not exceed the stated principal amount plus the maximum return at maturity. Buffer percentage: 10.00% Cash buffer: $100.00 in cash per security (equal to the stated principal amount multiplied by the buffer percentage) Listing: The securities will not be listed on any securities exchange CUSIP: 17324XW89 Investor Profile Investor Seeks: Investor Can Accept: â– A medium-term equity-linked investment â– A holding period of approximately three years â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 33 Autocallable Contingent Coupon Equity Linked Securities Linked to Amazon.com, Inc. Indicative Terms* Issuer: Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc. Guarantee: All payments due on the securities are fully and unconditionally guaranteed by Citigroup Inc. Underlying: Amazon.com, Inc. Stated principal amount: $5,000 per security Pricing date: September 30, 2020 Issue date: October 5, 2020 Valuation date: December 30, 2020, March 30, 2021, June 30, 2021 and September 30, 2021 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur Maturity date: Unless earlier redeemed, October 5, 2021 Contingent coupon payment The fifth business day after each valuation date, except that the contingent coupon payment date dates: following the final valuation date will be the maturity date Contingent coupon: On each contingent coupon payment date, unless previously redeemed, the securities will pay a contingent coupon equal to at least 2.00% of the stated principal amount of the securities (equivalent to a contingent coupon rate of at least 8.00% per annum) (to be determined on the pricing date) if and only if the closing value of the worst performing underlying on the immediately preceding valuation date is greater than or equal to its coupon barrier value. If the closing value of the worst performing underlying on any valuation date is less than its coupon barrier value, you will not receive any contingent coupon payment on the immediately following contingent coupon payment date. If the closing value of the worst performing underlying on one or more valuation dates is less than its coupon barrier value and, on a subsequent valuation date, the closing value of the worst performing underlying on that subsequent valuation date is greater than or equal to its coupon barrier value, your contingent coupon payment for that subsequent valuation date will include all previously unpaid contingent coupon payments (without interest on amounts previously unpaid). However, if the closing value of the worst performing underlying on a valuation date is less than its coupon barrier value and the closing value of the worst performing underlying on each subsequent valuation date up to and including the final valuation date is less than its coupon barrier value, you will not receive the unpaid contingent coupon payments in respect of those valuation dates. Payment at maturity: If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you then hold (in addition to the final contingent coupon payment, if applicable): • I If the final underlying value is greater than or equal to the final barrier value: $5,000 • If the final underlying value is less than the final barrier value: a fixed number of underlying shares of the underlying equal to the equity ratio (or, if we elect, the cash value of those shares based on the final underlying value) If the securities are not automatically redeemed prior to maturity and the final underlying value is less than the final barrier value, you will receive underlying shares (or, in our sole discretion, cash) that will be worth significantly less than the stated principal amount of your securities, and possibly nothing, at maturity, and you will not receive any contingent coupon payment at maturity (including any previously unpaid contingent coupon payments). For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

34 CitiFirst Offerings Brochure | September 2020 Initial underlying value: $ , the closing value of the underlying on the pricing date Final underlying value: The closing value of the underlying on the valuation date Coupon barrier value: $ , 74.00% of the initial underlying value Final barrier value: $ , 74.00% of the initial underlying value Equity ratio: , the stated principal amount divided by the initial underlying value Listing: The securities will not be listed on any securities exchange Underwriter: Citigroup Global Markets Inc. (“CGMI”), an affiliate of the issuer, acting as principal Automatic early redemption: If, on any potential autocall date, the closing value of the worst performing underlying on that potential autocall date is greater than or equal to its initial underlying value, each security you then hold will be automatically called on that potential autocall date for redemption on the immediately following contingent coupon payment date for an amount in cash equal to $5,000 plus the related contingent coupon payment. The automatic early redemption feature may significantly limit your potential return on the securities. If the worst performing underlying performs in a way that would otherwise be favorable, the securities are likely to be automatically called for redemption prior to maturity, cutting short your opportunity to receive contingent coupon payments. The securities may be automatically called for redemption as early as the first potential autocall date specified below. Potential autocall dates: The valuation dates scheduled to occur on December 30, 2020, March 30, 2021 and June 30, 2021 CUSIP: 17324X2G4 Investor Profile Investor Seeks: Investor Can Accept: â– A short-term equity-linked investment â– A holding period of approximately one year â– A risk-adjusted equity complement â– The possibility of losing a significant portion of the principal amount invested â– The structured investments discussed herein are not suitable for all investors. Prospective investors should evaluate their financial objectives and tolerance for risk prior to investing in any structured investment A complete description of the risks associated with this investment is outlined in the “Summary Risk Factors” section of the applicable preliminary pricing supplement. For questions, please call your Financial Advisor *The information listed above is not intended to be a complete description of all of the terms, risks and benefits of a particular investment. All maturities are approximate. All terms in brackets are indicative only and will be set on the applicable pricing date. All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of the Market-Linked Certificates of Deposit which have FDIC insurance, subject to applicable limitations. Please refer to the relevant investment’s offering documents and related material(s) for additional information

CitiFirst Offerings Brochure | September 2020 35 General Overview of Investments CitiFirst Protection Investments Investments Maturity Risk Profile* Return* Contingent Full principal If the underlying never crosses either an upside or downside threshold, the return on the Absolute Return 1-2 Years amount due at investment equals the absolute value of the return of the underlying. Otherwise, the return MLDs/Notes maturity equals zero Contingent Upside Full principal If the underlying crosses an upside threshold, the return on the investment equals an interest Participation 1-5 Years amount due at payment paid at maturity. Otherwise, the return equals the greater of the return of the MLDs/Notes maturity underlying and zero Full principal If the underlying ever crosses an upside threshold during a coupon period, the return for the Minimum Coupon 3-5 Years amount due at coupon period equals the minimum coupon. Otherwise, the return for a coupon period equals Notes maturity the greater of the return of the underlying during the coupon period and the minimum coupon Market-Linked Notes/ Full principal The return on the investment equals the greater of the return of the underlying multiplied by Deposits & Safety First 3-7 Years amount due at a participation rate and zero; the maximum return is capped Trust Certificates maturity CitiFirst Performance Investments Investments Maturity Risk Profile* Return* Payment at A fixed coupon is paid regardless of the performance of the underlying. If the underlying 6-13 maturity may never crosses a downside threshold, the return on the investment equals the coupons paid. ELKS® Months be less than the Otherwise, the return equals the sum of the coupons paid and the return of the underlying at principal amount maturity If the return of the underlying is positive at maturity, the return on the investment equals Payment at the lesser of (a) the return of the underlying multiplied by a participation rate and (b) the maturity may maximum return on the notes. If the return of the underlying is either zero or negative by Buffer Notes 1-5 Years be less than the an amount lesser than the buffer amount, the investor receives the stated principal amount. principal amount Otherwise, the return on the investment equals the return of the underlying plus the buffer amount If the underlying is equal to or greater than a threshold (such as its initial value) on any Payment at call date, the note is called and the return on the investment equals a fixed premium. If the maturity may CoBas/PACERSSM 1-5 Years be less than the note has not been called, at maturity, if the underlying has crossed a downside threshold, the return on the investment equals the return of the underlying, which will be negative. Other-principal amount wise, the return equals zero If the return of the underlying is positive at maturity, the return on the investment equals Payment at the return of the underlying multiplied by a participation rate (some versions are subject to a maturity may LASERSSM 1-5 Years be less than the maximum return on the notes). If the return of the underlying is negative and the underlying has crossed a downside threshold, the return on the investment equals the return of the principal amount underlying, which will be negative. Otherwise, the return equals zero CitiFirst Opportunity Investments Investments Maturity Risk Profile* Return* Payment at If the underlying is above its initial level at maturity, the return on the investment equals the Upturn Notes 1-2 Years maturity may be lesser of the return of the underlying multiplied by a participation rate and the maximum zero return on the notes. Otherwise, the return equals the return of the underlying Payment at If the underlying is equal to or above its initial level at maturity, the return on the investment Fixed Upside 1-2 Years maturity may be equals a predetermined fixed amount. Otherwise, the return equals the Return Notes zero return of the underlying Payment at The return on the investment equals the return of a unique index created by Citi Strategic Market 3-4 Years maturity may be Access Notes zero *All returns and any principal amount due at maturity are subject to the applicable issuer’s credit risk, with the exception of Market-Linked Certificates of Deposit which has FDIC insurance, subject to applicable limitations. This is not a complete list of CitiFirst structures. The descriptions above are not intended to completely describe how an investment works or to detail all of the terms, risks and benefits of a particular investment. The return profiles can change. Please refer to the offering documents and related material(s) of a particular investment for a comprehensive description of the structure, terms, risks and benefits related to that investment.

36 CitiFirst Offerings Brochure | September 2020 Important Information for the Monthly Offerings Investment Information The investments set forth in the previous pages are intended for general indication only of the CitiFirst Investments offerings. The issuer reserves the right to terminate any offering prior to its pricing date or to close ticketing early on any offering. SEC Registered (Public) Offerings Each issuer, if applicable, has separately filed a registration statement (including a prospectus) with the Securities and Exchange Commission (the “SEC”) for the SEC registered offerings by that issuer, to which this communication relates. Before you invest in any of the registered offerings identified in this Offerings Brochure, you should read the prospectus in the applicable registration statement and the other documents the issuer and guarantor, if applicable, have filed with the SEC for more complete information about that issuer and offerings. You may get these documents for free by visiting EDGAR on the SEC website at www.sec.gov. For Registered Offerings Issued by: Citigroup Global Markets Holdings Inc. Issuer’s Registration Statement Numbers: 333-216372 and 333-216372-01 Issuer’s CIK on the SEC Website: 0000200245 Alternatively, you can request a prospectus and any other documents related to the offerings, either in hard copy or electronic form, by calling toll-free 1-877-858-5407 or by calling your Financial Advisor. The SEC registered securities described herein are not bank deposits but are senior, unsecured debt obligations of the issuer. The SEC registered securities are not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other governmental agency or instrumentality. Market-Linked Certificates of Deposit The Market-Linked Deposits (“MLDs”) are not SEC registered offerings and are not required to be so registered. For indicative terms and conditions on any MLD, please contact your Financial Advisor or call the toll-free number 1-800-831-9146.

CitiFirst Offerings Brochure | September 2020 37 Overview of Key Benefits and Risks of CitiFirst Investments Benefits due on these investments, including any of the underlying asset or index and, principal due at maturity and therefore therefore, the value of the investment. â– Investors can access investments linked to investors are subject to the credit risk of Further, any research, opinion or a variety of underlying assets or indices, the applicable issuer. recommendation expressed within such such as domestic and foreign indices, research reports may not be consistent exchange-traded funds, commodities, â– Secondary Market – There may be little with purchasing, holding or selling the foreign-exchange, interest rates, equities, or no secondary market for a particular investment. or a combination thereof. investment. If the applicable offering document(s) so specifies, the issuer may â–The United States Federal Income â– Structured investments can offer unique apply to list an investment on a securities Tax Consequences of Structured risk/return profiles to match investment exchange, but it is not possible to predict Investments are Uncertain – No objectives, such as the amount of whether any investment will meet the statutory, judicial or administrative principal due at maturity, periodic income, listing requirements of that particular authority directly addresses the and enhanced returns. exchange, or if listed, whether any characterization of structured secondary market will exist. investments for U.S. federal income tax purposes. The tax treatment of a Risks â– Resale Value of a CitiFirst Structured structured investment may be very Investment May be Lower than Your different than that of its underlying â– The risks below are not intended to be Initial Investment – Due to, among other asset. As a result, significant aspects an exhaustive list of the risks associated things, the changes in the price of and of the U.S. federal income tax with a particular CitiFirst Structured dividend yield on the underlying asset, consequences and treatment of an Investment offering. Before you invest in interest rates, the earnings performance investment are not certain. The offering any CitiFirst Structured Investment you of the issuer of the underlying asset, document(s) for each structured should thoroughly review the particular the applicable issuer of the CitiFirst investment contains tax conclusions investment’s offering document(s) and Structured Investment’s perceived and discussions about the expected related material(s) for a comprehensive creditworthiness, the investment may U.S. federal income tax consequences description of the risks and considerations trade, if at all, at prices below its initial and treatment of the related structured associated with the particular investment. issue price and an investor could receive investment. However, no ruling is being substantially less than the amount of his/ requested from the Internal Revenue â–Potential for Loss her original investment upon any resale of Service with respect to any structured â– The terms of certain investments the investment. investment and no assurance can be provide that the full principal given that the Internal Revenue Service amount is due at maturity, subject â– Volatility of the Underlying Asset or will agree with the tax conclusions and to the applicable issuer’s credit Index – Depending on the investment, treatment expressed within the offering risk. However, if an investor sells the amount you receive at maturity document(s) of a particular structured or redeems such investment prior to could depend on the price or value of investment. Citigroup Inc., its affiliates, maturity, the investor may receive the underlying asset or index during the and employees do not provide tax or an amount less than his/her original term of the trade as well as where the legal advice. Investors should consult investment. price or value of the underlying asset or with their own professional advisor(s) â– The terms of certain investments index is at maturity; thus, the volatility on such matters before investing in any provide that the payment due at of the underlying asset or index, which structured investment. maturity could be significantly less is the term used to describe the size and than the full principal amount and, frequency of market fluctuations in the â– Fees and Conflicts – The issuer of for certain investments, could be price or value of the underlying asset or a structured investment and its zero. In these cases, an investor may index, may result in an investor receiving affiliates may play a variety of roles receive an amount significantly less an amount less than he/she would in connection with the investment, than his/her original investment and otherwise receive. including acting as calculation agent may receive nothing at maturity of and hedging the issuer’s obligations the investment. â– Potential for Lower Comparable Yield – under the investment. In performing The effective yield on any investment may these duties, the economic interests â–Appreciation May Be Limited – be less than that which would be payable of the affiliates of the issuer may be Depending on the investment, an on a conventional fixed-rate debt security adverse to the interest of the investor. investor’s appreciation may be limited of the same issuer with comparable by a maximum amount payable or by the maturity. extent to which the return reflects the performance of the underlying asset or â– Affiliate Research Reports and index. Commentary – Affiliates of the particular issuer may publish research reports or â– Issuer Credit Risk – All payments on otherwise express opinions or provide CitiFirst Structured Investments are recommendations from time to time dependent on the applicable issuer’s or regarding the underlying asset or index guarantor’s ability to pay all amounts which may influence the price or value

38 CitiFirst Offerings Brochure | September 2020 Additional Considerations Please note that the information contained sell shares or debentures (whether as principal (a) a corporation (which is not an accredited in this brochure is current as of the date or agent); (2) to “professional investors” within investor) the sole business of which is to hold indicated and is not intended to be a complete the meaning of the Securities and Futures investments and the entire share capital of description of the terms, risks and benefits Ordinance (Cap. 571) of Hong Kong (the “SFO”) which is owned by one or more individuals, associated with any particular structured and any rules made under the SFO; or (3) in each of whom is an accredited investor, or investment. Therefore, all of the information other circumstances which do not result in the set forth herein is qualified in its entirety by document being a “prospectus” as defined in (b) a trust (other than a trust the trustee the more detailed information provided in the the Companies Ordinance (Cap. 32) of Hong of which is an accredited investor) whose offering documents(s) and related material for Kong (the “CO”) or which do not constitute an sole purpose is to hold investments and the respective structured investment. offer to the public within the meaning of the of which each beneficiary is an individual CO. who is an accredited investor, should note The structured investments discussed within that securities of that corporation or the this brochure are not suitable for all investors. There is no advertisement, invitation or beneficiaries’ rights and interest in that trust Prospective investors should evaluate their document relating to structured investments, may not be transferred for 6 months after financial objectives and tolerance for risk prior which is directed at, or the contents of which that corporation or that trust has acquired the to investing in any structured investment. are likely to be accessed or read by, the public structured investments under Section 275 of in Hong Kong (except if permitted to do so the Securities and Futures Act pursuant to an Tax Disclosure under the laws of Hong Kong) other than with offer made in reliance on an exemption under respect to structured investments which are or Section 275 of the Securities and Futures Act Citigroup Inc., its affiliates and are intended to be disposed of only to persons unless: employees do not provide tax or legal outside Hong Kong or only to the persons or in advice. To the extent that this brochure the circumstances described in the preceding (i) the transfer is made only to institutional or any offering document(s) concerns paragraph. investors, or relevant persons as defined in Section 275(2) of that Act, or arises from tax matters, it is not intended to be WARNING TO INVESTORS IN SINGAPORE an offer referred to in Section 275(1A) of used and cannot be used by a taxpayer ONLY: This document has not been registered that Act (in the case of a corporation) or in for the purpose of avoiding penalties as a prospectus with the Monetary Authority accordance with Section 276(4)(i)(B) of that that may be imposed by law. Any such of Singapore under the Securities and Futures Act (in the case of a trust); taxpayer should seek advice based on Act, Chapter 289 of the Singapore Statutes the taxpayer’s particular circumstances (the Securities and Futures Act). Accordingly, (ii) no consideration is or will be given for the from an independent tax advisor. neither this document nor any other document transfer; or or material in connection with the offer or sale, ERISA and IRA Purchases Prohibited or invitation for subscription or purchase, of (iii) the transfer is by operation of law. the structured investments may be circulated Employee benefit plans subject to ERISA, or distributed, nor may the structured retirement accounts (including Keogh, SEP investments be offered or sold, or be made and SIMPLE plans, individual retirement the subject of an invitation for subscription accounts and individual retirement annuities) or purchase, whether directly or indirectly, and entities the assets of which are deemed to the public or any member of the public in to constitute the assets of such plans are not Singapore other than in circumstances where permitted to purchase structured investments. the registration of a prospectus is not required and thus only (1) to an institutional investor or Distribution Limitations and Considerations other person falling within section 274 of the Securities and Futures Act, (2) to a relevant This document may not be distributed in any person (as defined in section 275 of the jurisdiction where it is unlawful to do so. The Securities and Futures Act) or to any person investments described in this document may pursuant to section 275(1A) of the Securities not be marketed, or sold or be available for and Futures Act and in accordance with the offer or sale in any jurisdiction outside of the conditions specified in section 275 of that Act, U.S., unless permitted under applicable law and or (3) pursuant to, and in accordance with the in accordance with the offering documents and conditions of, any other applicable provision related materials. In particular: of the Securities and Futures Act. No person receiving a copy of this document may treat WARNING TO INVESTORS IN HONG KONG the same as constituting any invitation to ONLY: The contents of this document have not him/her, unless in the relevant territory such been reviewed by any regulatory authority in an invitation could be lawfully made to him/ Hong Kong. Investors are advised to exercise her without compliance with any registration caution in relation to the offer. If Investors are or other legal requirements or where such in any doubt about any of the contents of this registration or other legal requirements have document, they should obtain independent been complied with. Each of the following professional advice. relevant persons specified in Section 275 of the Securities and Futures Act who has This offer is not being made in Hong Kong, subscribed for or purchased structured by means of any document, other than (1) to investments, namely a person who is: persons whose ordinary business it is to buy or

CitiFirst Offerings Brochure | September 2020 39 Notes

CitiFirst At Citi, our talented professionals are dedicated to delivering innovative investments and services to our clients across the globe. Our teams in structuring, marketing, sales and trading are focused on educating our distribution partners and putting clients first. To discuss CitiFirst investment ideas and strategies, Financial Advisors, Private Bankers and other distribution partners may call our sales team. Private Investors should call their financial advisor or private banker. Client service number for Financial Advisors and Distribution Partners in the Americas: +1 (212) 723-7288 For more information, please go to www.citifirst.com Standard & Poor’s,” “S&P 500®,” and “S&P®” are trademarks of The McGraw-Hill Companies, Inc. and have been licensed for use by Citigroup Inc. Dow Jones Industrial AverageTM is a service mark of Dow Jones & Company, Inc. (“Dow Jones”) and has been licensed for use by Citigroup Funding Inc. The Notes described herein are not sponsored, endorsed, sold or promoted by Dow Jones and Dow Jones makes no warranties and bears no liability with respect to the Notes. EURO STOXX 50® is a service mark of STOXX Limited and/or its licensors that has been sublicensed for use for certain purposes by Citigroup Inc. and its affiliates. For more information, see “Equity Index Descriptions— EURO STOXX 50® Index — License Agreement with STOXX Limited” in the accompanying underlying supplement. Citi Personal Wealth Management is a business of Citigroup Inc., which offers investment products through Citigroup Inc., member SIPC. Citibank, N.A. is an affiliated company under control of Citigroup Inc. ©2020 Citigroup Inc. Citi and Citi with Arc Design are registered service marks of Citigroup Inc. or its affiliates.