Primary Offering Prospectus - Form 424B2

The information in this preliminary pricing supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission. This preliminary pricing supplement and the accompanying index supplement, prospectus supplement and prospectus are not an offer to sell these securities, nor are they soliciting an offer to buy these securities, in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED OCTOBER 30, 2024

Citigroup Global Markets Holdings Inc.

November , 2024

Medium-Term Senior Notes, Series N

Pricing Supplement No. 2024-USNCH24365

Filed Pursuant to Rule 424(b)(2)

Registration Statement Nos. 333-270327 and 333-270327-01

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The securities offered by this pricing supplement are unsecured debt securities issued by Citigroup Global Markets Holdings Inc. and guaranteed by Citigroup Inc. Unlike conventional debt securities, the securities do not pay interest. Instead, the securities offer the potential for automatic early redemption at a premium on a periodic basis on the terms described below if the closing level of the Citi Dynamic Asset Selector 5 Excess Return Index (the "Index") on any valuation date prior to the final valuation date exceeds the initial index level. If the securities are not automatically redeemed prior to maturity, then the securities will not be redeemed at a premium but offer the potential for a positive return at maturity based on the performance of the Index from the initial index level to the final index level.

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If on any valuation date prior to the final valuation date, the closing level of the Index is greater than or equal to the initial index level, the securities will be automatically redeemed. If the securities are not automatically redeemed prior to maturity and the Index appreciates from the initial index level to the final index level, you will receive a positive return at maturity equal to that appreciation multiplied by the upside participation rate specified below. However, if the securities are not automatically redeemed prior to maturity and the Index remains the same or depreciates, you will be repaid the stated principal amount of your securities at maturity but will not receive any return on your investment. The securities are designed for investors who are willing to forgo interest on the securities and accept the risk of not receiving any return on the securities in exchange for the possibility of automatic early redemption at a premium or, if the securities are not automatically redeemed, a positive return at maturity based in each case on the performance of the Index. Even if the Index appreciates from the initial index level to the final index level, so that you do receive a positive return at maturity, there is no assurance that your total return at maturity on the securities will compensate you for the effects of inflation or be as great as the yield you could have achieved on a conventional debt security of ours of comparable maturity.

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In order to obtain the exposure to the Index that the securities provide, investors must be willing to accept (i) an investment that may have limited or no liquidity and (ii) the risk of not receiving any amount due under the securities if we and Citigroup Inc. default on our obligations. All payments on the securities are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc.

KEY 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:

The Citi Dynamic Asset Selector 5 Excess Return Index (ticker symbol: "CIISDA5N")

Aggregate stated principal amount:

$

Stated principal amount:

$1,000 per security

Pricing date:

November 25, 2024

Issue date:

November 29, 2024. See "Supplemental Plan of Distribution" in this pricing supplement for additional information.

Valuation dates:

November 25, 2025, November 25, 2026, November 26, 2027, November 27, 2028 and November 26, 2029 (the "final valuation date"), each subject to postponement if such date is not an index business day

Maturity date:

Unless earlier redeemed, November 29, 2029

Automatic early redemption:

If, on any valuation date prior to the final valuation date, the closing level of the Index is greater than or equal to the initial index level, the securities will be automatically redeemed on the third business day immediately following that valuation date for an amount in cash per security equal to $1,000 plus the premium applicable to that valuation date. If the securities are automatically redeemed following any valuation date prior to the final valuation date, they will cease to be outstanding and you will not receive the premium applicable to any later valuation date or have the opportunity to participate in any appreciation of the Index.

Premium:

The premium applicable to each valuation date prior to the final valuation date will be determined on the pricing date and will be at least the percentage indicated below.The premium may be significantly less than the appreciation of the Index from the pricing date to the applicable valuation date.

Payment at maturity:

If the securities are not automatically redeemed prior to maturity, you will receive at maturity for each security you then hold, the stated principal amount plus the return amount, which will be either zero or positive

Return amount:

If the final index level is greater than the initial index level:

$1,000 × the index return × the 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 Index on the pricing date

Final index level:

The closing level of the Index on the final valuation date

Upside participation rate:

100.00%

Index return:

(i) The final index level minus the initial index level, divided by (ii) the initial index level

Listing:

The securities will not be listed on any securities exchange

CUSIP / ISIN:

17333AVA4 / US17333AVA41

Underwriter:

Citigroup Global Markets Inc. ("CGMI"), an affiliate of the issuer, acting as principal

Underwriting fee and issue price:

Issue price⁽¹⁾

Underwriting fee⁽²⁾

Proceeds to issuer⁽³⁾

Per security:

$1,000.00

$37.50

$962.50

Total:

$

$

$

Citigroup Global Markets Holdings Inc.

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a more detailed description of the Index, beginning on page IS-24 of the accompanying index supplement;

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more detailed risk factors relating to the Index, beginning on page IS-12 of the accompanying index supplement;

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the Index rules that govern the calculation of the Index, beginning on page IS-59 of the accompanying index supplement;

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general terms of the securities, including terms relating to the potential postponement of a valuation date and the maturity date upon the occurrence of a market disruption event and terms specifying the consequences of the discontinuance of the Index, beginning on page IS-19 of the accompanying index supplement;

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considerations for certain employee benefit plans or investors that are investing with assets of such plans, beginning on page IS-41 of the accompanying index supplement; and

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descriptions of the constituents that are eligible for inclusion in the Index, beginning on page IS-51 of the accompanying index supplement.

PS-2

Citigroup Global Markets Holdings Inc.

Asset Class

Constituent

Ticker

Underlying Futures Contract

Reference Asset

Market Sector

Equity futures

S&P 500 Futures Excess Return Index (the "U.S. Equity Futures Constituent")

SPXFP

E-mini S&P 500 Futures

S&P 500^® Index

U.S. large-cap equities

Fixed income futures

S&P 10-Year U.S. Treasury Note Futures Excess Return Index (the "U.S. Treasury Futures Constituent")

SPUSTTP

10-Year U.S. Treasury Note Futures

10-Year U.S. Treasury Notes

U.S. 10-year treasuries

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The trend of the performance of the U.S. Equity Futures Constituent over a look-back period of 21 Index Business Days, measured by the linear regression methodology described in the accompanying index supplement (the "Trend Signal"). The Trend Signal will be either "upward" or "downward".

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The realized volatility of the U.S. Equity Futures Constituent over a look-back period of 63 Index Business Days (the "Volatility Signal").

Signals

Market Regime

Selected Portfolio (consisting of the Constituents with the percentage weights indicated below)

Stable-Trending Up

Equity-Focused Portfolio

Unstable-Trending Up

Intermediate Portfolio

Stable-Trending Down

Unstable-Trending Down

Treasury Portfolio

PS-3

Citigroup Global Markets Holdings Inc.

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The Index is a trend-following index and is subject to the limitations inherent in all trend-following methodologies, including the fact that past performance is no guarantee of future performance. Furthermore, the Index's trend-following methodology may be unsuccessful even if past trends do prove to be indicative of future performance, because the Trend Signal may not accurately capture the trend or the Index may not change its Selected Portfolio quickly enough in response to changes in the Market Regime.

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Each Constituent is a futures-based index and is therefore expected to reflect the implicit cost of a financed position in its Reference Asset. This implicit financing cost will adversely affect the level of each Constituent and cause each Constituent to underperform its Reference Asset. Any increase in market interest rates will be expected to increase this implicit financing cost and will further adversely affect the performance of the Constituents and, therefore, the performance of the Index.

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The Index rules limit the exposure the Index may have to the U.S. Equity Futures Constituent and, as a result, the Index is likely to significantly underperform equities in rising equity markets.

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The Index will have significant exposure to the U.S. Treasury Futures Constituent, which has limited return potential and significant downside potential, particularly in times of rising interest rates.

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The volatility-targeting feature significantly reduces the potential for Index gains. At any time when the Index has less than 100% exposure to the Selected Portfolio, the Index will participate in only a limited degree of the performance of the Selected Portfolio.

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The performance of the Index will be reduced by an index fee. The index fee will place a drag on the performance of the Index, offsetting any appreciation of the Selected Portfolio, exacerbating any depreciation of the Selected Portfolio and causing the level of the Index to decline steadily if the value of the Selected Portfolio remains relatively constant.

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The Index was launched on June 13, 2016 and, therefore, has a limited performance history.

PS-4

Citigroup Global Markets Holdings Inc.

If the first valuation date on which the closing level of the Index is greater than or equal to the initial index level is...

...then you will receive the following payment per security upon automatic early redemption:

November 25, 2025

$1,000.00 + applicable premium = $1,000.00 + $67.50 = $1,067.50

November 25, 2026

$1,000.00 + applicable premium = $1,000.00 + $135.00 = $1,135.00

November 26, 2027

$1,000.00 + applicable premium = $1,000.00 + $202.50 = $1,202.50

November 27, 2028

$1,000.00 + applicable premium = $1,000.00 + $270.00 = $1,270.00

Payment at Maturity Diagram

n The Securities

n The Index

PS-5

Citigroup Global Markets Holdings Inc.

PS-6

Citigroup Global Markets Holdings Inc.

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You may not receive any return on your investment in the securities. If the closing level of the Index is not greater than or equal to the initial index level on any valuation date prior to the final valuation date, then the securities will not be automatically redeemed at a premium. In that event, you will receive a positive return on your investment in the securities only if the Index appreciates from the initial index level to the final index level. If the final index level is less than or equal to the initial index level, you will receive only the stated principal amount of $1,000 for each security you hold at maturity. As the securities do not pay any interest, even if the Index appreciates from the initial index level to the final index level, there is no assurance that your total return on the securities will be as great as could have been achieved on our conventional debt securities of comparable maturity.

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Your potential return on the securities in connection with an automatic early redemption is limited. If the securities are automatically redeemed prior to maturity, your potential return on the securities is limited to the premium applicable to the relevant valuation date, as described on the cover page of this pricing supplement, regardless of how significantly the closing level of the Index may exceed the initial index level.

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The term of the securities may be as short as one year. If the closing level of the Index on any valuation date prior to the final valuation date, including the valuation date expected to occur approximately one year after the pricing date, is greater than or equal to the initial index level, the securities will be automatically redeemed. If the securities are automatically redeemed, you will not receive the premium applicable to any later valuation date.

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Although the securities provide for the repayment of the stated principal amount at maturity, you may nevertheless suffer a loss on your investment in real value terms if the securities are not automatically redeemed prior to maturity or if the Index declines or does not appreciate from the initial index level to the final index level. This is because inflation may cause the real value of the stated principal amount to be less at maturity than it is at the time you invest, and because an investment in the securities represents a forgone opportunity to invest in an alternative asset that does generate a positive real return. This potential loss in real value terms is significant given the term of the securities. You should carefully consider whether an investment that may not provide for any return on your investment, or may provide a return that is lower than the return on alternative investments, is appropriate for you.

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The securities do not pay interest. Unlike conventional debt securities, the securities do not pay interest or any other amounts prior to maturity. You should not invest in the securities if you seek current income during the term of the securities.

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Your return on the securities depends on the closing level of the Index on only the valuation dates. Because your payment upon automatic early redemption, if applicable, or at maturity depends on the closing level of the Index solely on one of the applicable valuation dates, you are subject to the risk that the closing level of the Index on that day may be lower, and possibly significantly lower, than on one or more other dates during the term of the securities. If you had invested in another instrument linked to the Index that you could sell for full value at a time selected by you, or if the return on the securities was based on an average of closing levels of the Index, you might have achieved better returns.

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The securities are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc. If we default on our obligations under the securities and Citigroup Inc. defaults on its guarantee obligations, you may not receive anything owed to you under the securities.

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The securities will not be listed on any securities exchange and you may not be able to sell them prior to maturity. The securities will not be listed on any securities exchange. Therefore, there may be little or no secondary market for the securities. CGMI currently intends to make a secondary market in relation to the securities and to provide an indicative bid price for the securities on a daily basis. Any indicative bid price for the securities provided by CGMI will be determined in CGMI's sole discretion, taking into account prevailing market conditions and other relevant factors, and will not be a representation by CGMI that the securities can be sold at that price, or at all. CGMI may suspend or terminate making a market and providing indicative bid prices without notice, at any time and for any reason. If CGMI suspends or terminates making a market, there may be no secondary market at all for the securities because it is likely that CGMI will be the only broker-dealer that is willing to buy your securities prior to maturity. Accordingly, an investor must be prepared to hold the securities until maturity.

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Sale of the securities prior to maturity may result in a loss of principal. You will be entitled to receive at least the full stated principal amount of your securities, subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc., only if you hold the securities to maturity. The value of the securities may fluctuate during the term of the securities, and if you are able to sell your securities prior to maturity, you may receive less than the full stated principal amount of your securities.

PS-7

Citigroup Global Markets Holdings Inc.

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Because the securities provide for repayment of the principal amount at maturity regardless of the performance of the Index, you may not receive a meaningful incremental benefit from the Index's volatility-targeting feature even though you will be subject to its significant drawbacks. One potential benefit of the Index's volatility-targeting feature is that it may reduce the potential for large Index declines in volatile equity markets. However, that reduced potential for large Index declines comes at a price: as discussed in more detail below, the volatility-targeting feature is likely to significantly reduce the potential for Index gains in rising equity markets. Because the securities provide for repayment of the principal amount at maturity even if the Index experiences a large decline, any reduced potential for large Index declines resulting from the volatility-targeting feature may not provide a meaningful incremental benefit to an investor in the securities. Investors in the securities will, however, be fully subject to the drawbacks of the volatility-targeting feature, in the form of the reduced participation in rising equity markets and the other risks described below under "-Key Risks Relating to the Index". As a result, you should understand that any benefit you receive from the Index's volatility-targeting feature may be outweighed by its drawbacks.

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The estimated value of the securities on the pricing date, based on CGMI's proprietary pricing models and our internal funding rate, will be less than the issue price. The difference is attributable to certain costs associated with selling, structuring and hedging the securities that are included in the issue price. These costs include (i) any selling concessions or other fees paid in connection with the offering of the securities, (ii) hedging and other costs incurred by us and our affiliates in connection with the offering of the securities and (iii) the expected profit (which may be more or less than actual profit) to CGMI or other of our affiliates in connection with hedging our obligations under the securities. These costs adversely affect the economic terms of the securities because, if they were lower, the economic terms of the securities would be more favorable to you. The economic terms of the securities are also likely to be adversely affected by the use of our internal funding rate, rather than our secondary market rate, to price the securities. See "The estimated value of the securities would be lower if it were calculated based on our secondary market rate" below.

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The estimated value of the securities was determined for us by our affiliate using proprietary pricing models. CGMI derived the estimated value disclosed on the cover page of this pricing supplement from its proprietary pricing models. In doing so, it may have made discretionary judgments about the inputs to its models, such as the volatility of the Index and interest rates. CGMI's views on these inputs may differ from your or others' views, and as an underwriter in this offering, CGMI's interests may conflict with yours. Both the models and the inputs to the models may prove to be wrong and therefore not an accurate reflection of the value of the securities. Moreover, the estimated value of the securities set forth on the cover page of this pricing supplement may differ from the value that we or our affiliates may determine for the securities for other purposes, including for accounting purposes. You should not invest in the securities because of the estimated value of the securities. Instead, you should be willing to hold the securities to maturity irrespective of the initial estimated value.

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The estimated value of the securities would be lower if it were calculated based on our secondary market rate. The estimated value of the securities included in this pricing supplement is calculated based on our internal funding rate, which is the rate at which we are willing to borrow funds through the issuance of the securities. Our internal funding rate is generally lower than our secondary market rate, which is the rate that CGMI will use in determining the value of the securities for purposes of any purchases of the securities from you in the secondary market. If the estimated value included in this pricing supplement were based on our secondary market rate, rather than our internal funding rate, it would likely be lower. We determine our internal funding rate based on factors such as the costs associated with the securities, which are generally higher than the costs associated with conventional debt securities, and our liquidity needs and preferences. Our internal funding rate is not an interest rate that is payable on the securities.

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The estimated value of the securities is not an indication of the price, if any, at which CGMI or any other person may be willing to buy the securities from you in the secondary market. Any such secondary market price will fluctuate over the term of the securities based on the market and other factors described in the next risk factor. Moreover, unlike the estimated value included in this pricing supplement, any value of the securities determined for purposes of a secondary market transaction will be based on our secondary market rate, which will likely result in a lower value for the securities than if our internal funding rate were used. In addition, any secondary market price for the securities will be reduced by a bid-ask spread, which may vary depending on the aggregate stated principal amount of the securities to be purchased in the secondary market transaction, and the expected cost of unwinding related hedging transactions. As a result, it is likely that any secondary market price for the securities will be less than the issue price.

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The value of the securities prior to maturity will fluctuate based on many unpredictable factors. The value of your securities prior to maturity will fluctuate based on the closing level of the Index, the volatility of the closing level of the Index and a number of other factors, including general market interest rates, the time remaining to maturity of the securities and our and Citigroup Inc.'s creditworthiness, as reflected in our secondary market rate. Changes in the closing level of the Index may not result in a comparable change in the value of your securities. You should understand that the value of your securities at any time prior to maturity may be significantly less than the issue price.

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Immediately following issuance, any secondary market bid price provided by CGMI, and the value that will be indicated on any brokerage account statements prepared by CGMI or its affiliates, will reflect a temporary upward adjustment. The amount of this temporary upward adjustment will steadily decline to zero over the temporary adjustment period. See "Valuation of the Securities" in this pricing supplement.

PS-8

Citigroup Global Markets Holdings Inc.

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Our affiliates may have published research, expressed opinions or provided recommendations that are inconsistent with investing in the securities and may do so in the future, and any such research, opinions or recommendations could adversely affect the level of the Index. CGMI and other of our affiliates may publish research from time to time relating to the financial markets, any of the Constituents of the Index or the hypothetical investment methodology of the Index. Any research, opinions or recommendations provided by CGMI may influence the level of any Constituent of the Index, and they may be inconsistent with purchasing or holding the securities. CGMI and other of our affiliates may have published or may publish research or other opinions that call into question the investment view implicit in an investment in the securities. Any research, opinions or recommendations expressed by such affiliates of ours may not be consistent with each other and may be modified from time to time without notice. Investors should make their own independent investigation of the Constituents of the Index, the Index itself and the merits of investing in the securities.

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The level of a Constituent or of the Index may be affected by our or our affiliates' hedging and other trading activities. In anticipation of the sale of the securities, we expect to hedge our obligations under the securities directly or through one of our affiliates, which may involve taking positions directly in the futures contracts underlying the Constituents of the Index or other instruments that may affect the levels of the Constituents of the Index. We or our counterparties may also adjust this hedge during the term of the securities and close out or unwind this hedge on or before the final valuation date, which may involve, among other things, us or our counterparties purchasing or selling such futures contracts or other instruments. This hedging activity on or prior to the pricing date could potentially affect the levels of the Constituents of the Index on the pricing date and, accordingly, potentially increase the initial index level, which may adversely affect your return on the securities. Additionally, this hedging activity during the term of the securities, including on or near the valuation dates, could negatively affect the level of the Index and, therefore, adversely affect your payment at maturity on the securities or whether the securities are automatically redeemed. This hedging activity may present a conflict of interest between your interests as a holder of the securities and the interests we and/or our counterparties, which may be our affiliates, have in executing, maintaining and adjusting hedging transactions. These hedging activities could also affect the price, if any, at which CGMI or, if applicable, any other entity may be willing to purchase your securities in a secondary market transaction.

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We and our affiliates may have economic interests that are adverse to those of the holders of the securities as a result of our or our affiliates' business activities. We or our affiliates may currently or from time to time engage in business with the issuers of the stocks that constitute the Reference Asset of the U.S. Equity Futures Constituent, including extending loans to, making equity investments in or providing advisory services to such issuers. In the course of this business, we or our affiliates may acquire non-public information about such issuers, which we will not disclose to you. We do not make any representation or warranty to any purchaser of the securities with respect to any matters whatsoever relating to our or our affiliates' business with any such issuer. Moreover, if we or any of our affiliates are or become a creditor of any such issuer or otherwise enter into any transaction with any such issuer in the regular course of business, we or such affiliate may exercise any remedies against such issuer that are available to them without regard to the impact on your interests as a holder of the securities.

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The notes calculation agent, which is an affiliate of ours, will make important determinations with respect to the securities. If certain events occur, CGMI, as notes calculation agent, will be required to make discretionary judgments that could significantly affect your payment at maturity. In making these judgments, the notes calculation agent's interests as an affiliate of ours could be adverse to your interests as a holder of the securities. Such judgments could include, among other things:

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determining whether a market disruption event exists on a valuation date with respect to any Constituent of the Index then included in the Index;

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if the Index Level is not published by the Index Calculation Agent or if a market disruption event exists with respect to any Constituent of the Index then included in the Index on a valuation date, determining the closing level of the Index with respect to that date, which may require us to make a good faith estimate of the closing level of one or both Constituents of the Index if the market disruption event is continuing on the Backstop Date; and

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selecting a Successor Index or performing an alternative calculation of the closing level of the Index if the Index is discontinued.

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Discontinuance of the Index could adversely affect the value of the securities. The Index Administrator is not required to publish the Index throughout the term of the securities. The Index Administrator may determine to discontinue the Index, among other reasons, as a result of the occurrence of a material Regulatory Event. See "Description of the Citi Dynamic Asset Selector 5 Excess Return Index" in the accompanying index supplement for more information. If the Index is discontinued, the notes calculation agent will have the sole discretion to substitute a successor index that is comparable to the discontinued Index and is not precluded from considering other indices that are calculated and published by the notes calculation agent or any of its affiliates. Any such successor index may not perform favorably.

PS-9

Citigroup Global Markets Holdings Inc.

PS-10

Citigroup Global Markets Holdings Inc.

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The Index may not be successful and may underperform alternative investment strategies. There can be no assurance that the Index will achieve positive returns. The Index tracks the hypothetical performance of a rules-based investment methodology that, based on signals, selects a hypothetical investment Portfolio (the Selected Portfolio) to track until the signals determine that a change in U.S. equity market conditions (or Market Regimes) has occurred. The performance of the Index over that period will depend on the performance of the Selected Portfolio over that time period, minus the index fee and subject to the Index's volatility-targeting feature, all as more fully described in the accompanying index supplement. In general, if the Selected Portfolio appreciates over that period by more than the index fee, the level of the Index will increase, and if the Selected Portfolio depreciates over that period or appreciates by less than the index fee, the level of the Index will decrease. The performance of the Index may be less favorable than alternative investment strategies that could have been implemented, including an investment in a passive index fund.

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The Index's Signal-based allocation methodology has significant limitations. The Index will allocate exposure to the U.S. Equity Futures Constituent and/or the U.S. Treasury Futures Constituent based on two backward-looking Signals measured on each Index Business Day: one based on the trend of the performance of the U.S. Equity Futures Constituent, measured by the linear regression methodology described in the accompanying index supplement, over a look-back period of 21 Index Business Days (the Trend Signal) and one based on the realized volatility of the U.S. Equity Futures Constituent over a look-back period of 63 Index Business Days (the Volatility Signal). Based on these Signals, the Portfolio tracked by the Index during any given period (the Selected Portfolio for that period) will be the Equity-Focused Portfolio, the Treasury Portfolio or the Intermediate Portfolio, each of which has a predetermined degree of exposure to the U.S. Treasury Futures Constituent and/or the U.S. Equity Futures Constituent.

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Limitations of the Trend Signal. The Index's allocation methodology is premised on the assumption that, on an Index Business Day, the Trend Signal may provide an accurate indicator of the performance of the U.S. Equity Futures Constituent until the next Change in Market Regime (i.e., when the Signals indicate that another Selected Portfolio should be selected). In other words, the methodology assumes that the U.S. Equity Futures Constituent is likely to appreciate until the next Change in Market Regime if there is an upward Trend Signal. There is no guarantee that this will be the case, however. The Trend Signal is subject to a number of important limitations, including the following:

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Past performance may not predict future performance. On any given Index Business Day, the fact that the U.S. Equity Futures Constituent may have performed favorably over the prior 21 Index Business Days (approximately one month) does not necessarily mean that it will continue to perform favorably going forward. Future market conditions may differ from past market conditions, and the conditions that may have caused the favorable performance over the prior month may no longer exist.

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Markets may be efficient. Past appreciation may not necessarily be an indicator of future appreciation even if future market conditions do not differ materially from past market conditions. The efficient market hypothesis, a well-known theory in academic financial literature, states that the market is efficient and that current asset prices reflect all available relevant information. If true, the efficient market hypothesis implies that any perceived historical trend in the performance of the U.S. Equity Futures Constituent should not be an accurate predictor of its future performance. If the past performance of the U.S. Equity Futures Constituent proves not to be an accurate indicator of its actual performance over the next period, then the Index's trend-following allocation methodology may perform poorly.

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Time lag. The Trend Signal measures the performance of the U.S. Equity Futures Constituent over the last month and therefore suffers from a time lag, which may cause it to be late both in signaling an allocation to the U.S. Equity Futures Constituent and in signaling an allocation away from the U.S. Equity Futures Constituent. The Index determines the trend of the U.S. Equity Futures Constituent based on its levels over an observation period of 21 Index Business Days. If the trend in the performance of the U.S. Equity Futures Constituent changes, it may be a significant period of time before the Trend Signal reflects the change. As a result of this time lag, the Trend Signal may signal an allocation to the U.S. Equity Futures Constituent long after the U.S. Equity Futures Constituent begins to decline, potentially resulting in a significant decline in the level of the Index over a significant period of time. Alternatively, the Trend Signal may not identify the U.S. Equity Futures Constituent as being in an upward trend until long after the upward trend began. By the time the Trend Signal finally signals an allocation to the U.S. Equity Futures Constituent, the trend may already have run its course, and a period of decline may even have already begun. Because the Trend Signal may signal an allocation to the U.S. Equity Futures Constituent after it has already been trending upward for a significant period of time, the Trend Signal may effectively reflect a "buy high" strategy; and because the Trend Signal may signal an allocation away from the U.S. Equity Futures Constituent only after it has already been trending downward for a significant period of time, it may effectively reflect a "sell low" strategy. This combination of buying high and selling low may result in poor Index performance.

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Measurement error. Even if the historical trend in the level of the U.S. Equity Futures Constituent proves to be a predictor of the future performance of the U.S. Equity Futures Constituent, the way in which the Index measures the trend may not effectively capture it. For example, the Index uses a fixed rule for determining whether the U.S. Equity Futures Constituent is deemed to be in an upward trend or a downward trend: if the straight line that results from a linear regression of the levels of the U.S. Equity Futures Constituent (expressed logarithmically) on each of the Index Business Days in the relevant look-back period slopes upward, the Index interprets that as an indicator of an upward trend, and if that line slopes downward, the Index interprets that as an indication of a downward trend. If the U.S. Equity Futures Constituent appreciated during the first half of that period and then depreciated over the next half - but the depreciation was not quite as pronounced as the appreciation - the Index may identify an upward trend even though the most recent trend has been downward. In addition, the Index will not change its Selected Portfolio if the Trend Signal is not deemed to be statistically significant, even if the Signals would otherwise call for a change. The Index

PS-11

Citigroup Global Markets Holdings Inc.

also uses an arbitrary cut-off, which may not be the optimal cut-off to use for the Index, for determining whether the Trend Signal is statistically significant or not. Any fixed rule for determining whether the U.S. Equity Futures Constituent is in an upward or downward trend and whether such trend will signal a Change in Market Regime will necessarily be a blunt tool and, accordingly, may have a high rate of inaccuracy. The particular ways in which the Index operates may produce a lower return than other rules that could have been adopted for the identification of the trend in the level of the U.S. Equity Futures Constituent or its statistical significance. There is nothing inherent in the particular methodology used by the Index that makes it a more or less accurate predictor of a trend. It is possible that the rules used by the Index may not identify the trend as effectively as other rules that might have been adopted, or at all.

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Whipsaws. Trend-following methodologies may perform particularly poorly in "choppy" markets, where they may be subject to "whipsaws." Choppy markets are characterized by short-term volatility and the absence of consistent long-term performance trends. In choppy markets, whipsaws occur when the market reverses and does the opposite of what is indicated by past performance. The Index may experience a significant decline in these market conditions because, for example, if the Index identifies the U.S. Equity Futures Constituent as being in an upward trend (and the realized volatility of the U.S. Equity Futures Constituent over the relevant look-back period is less than or equal to 15%), the Selected Portfolio tracked by the Index will provide more exposure to the U.S. Equity Futures Constituent than any other possible Portfolio. If, after being allocated exposure, the U.S. Equity Futures Constituent suddenly declines significantly, the level of the Index may also decline significantly.

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Mean reversion. The Trend Signal is particularly likely to be ineffective if the U.S. Equity Futures Constituent exhibits mean reversion tendencies. Mean reversion is the theory that asset prices tend to fluctuate around, and revert to, a particular level (the "mean") over time. If the U.S. Equity Futures Constituent exhibits a high degree of mean reversion, its level may increase for a sufficient period of time to cause the Trend Signal to identify it as being in an upward trend, but then rapidly fall back toward its long-term mean after the Index allocates exposure to it, leading to declines in the level of the Selected Portfolio and therefore declines in the level of the Index.

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Limitations of the Volatility Signal. The Volatility Signal is based on the assumption that the volatility of the U.S. Equity Futures Constituent over a look-back period of 63 Index Business Days (approximately three months) may be an indicator of future volatility of the U.S. Equity Futures Constituent. Based on this assumption, on a Selection Date, the Index will determine to allocate the most exposure to the U.S. Equity Futures Constituent when the Volatility Signal is less than 15% (and if there is an upward Trend Signal). There is no guarantee that this assumption will be correct, however. The Volatility Signal is subject to significant limitations, including the following:

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Time lag. The Volatility Signal measures volatility over the last three months and therefore suffers from a time lag, which may cause it to be late both in signaling an allocation to the U.S. Equity Futures Constituent and in signaling an allocation away from the U.S. Equity Futures Constituent. The Index determines the volatility of the U.S. Equity Futures Constituent over a look-back period of 63 Index Business Days. If the volatility of the U.S. Equity Futures Constituent changes, it may be a significant period of time before the Volatility Signal reflects the change. As a result of this time lag, the Volatility Signal may signal an allocation to the U.S. Equity Futures Constituent long after the U.S. Equity Futures Constituent has become increasingly volatile, which can result in a significant decline in the level of the Index over a significant period of time. Alternatively, the Volatility Signal may not identify the volatility of the U.S. Equity Futures Constituent as being low until long after volatility decreased. By the time the Volatility Signal finally signals an allocation to the U.S. Equity Futures Constituent, the volatility may have increased again. This may result in poor Index performance.

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Historical measure. The 63-Day Realized Volatility measure used by the Index is a historical measure of volatility and does not reflect volatility going forward. Realized volatility is not the same as implied volatility, which is an estimation of future volatility and may better reflect market expectations.

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The performance of each Constituent is expected to be reduced by an implicit financing cost and any increase in this cost will adversely affect the performance of the Index. Each Constituent is a futures-based index. As a futures-based index, each Constituent is expected to reflect not only the performance of its corresponding Reference Asset (the S&P 500^® Index in the case of the U.S. Equity Futures Constituent and 10-year U.S. Treasury Notes in the case of the U.S. Treasury Futures Constituent), but also the implicit cost of a financed position in that Reference Asset. The cost of this financed position will adversely affect the level of each Constituent and, therefore, the Index. Any increase in market interest rates will be expected to further increase this implicit financing cost and will increase the negative effect on the performance of the Constituents and, therefore, the performance of the Index. Because of this implicit financing cost, the U.S. Equity Futures Constituent will underperform the total return performance of the S&P 500^® Index and the U.S. Treasury Futures Constituent will underperform a direct investment in 10-Year U.S. Treasury Notes.

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The Index ruleslimit the exposure the Index may have to the U.S. Equity Futures Constituent, and, as a result, the Index is likely to significantly underperform equities in rising equity markets. In no event will the weight of the U.S. Equity Futures Constituent exceed 66.66%, and in two of the three possible Portfolios, the weight of the U.S. Equity Futures Constituent will only be either 33.33% or 0%. In addition, the Index uses 15% as a threshold for elevated volatility, which is not unusually elevated from a historical perspective and may

PS-12

Citigroup Global Markets Holdings Inc.

result in reduced or eliminated exposure to the U.S. Equity Futures Constituent at a time when equity markets are in fact relatively stable and rising. Furthermore, even at a time when the Selected Portfolio is the Equity-Focused Portfolio, the Index's volatility-targeting feature may result in significantly reduced Index exposure to the Selected Portfolio (and, in turn, to the U.S. Equity Futures Constituent) because the Equity-Focused Portfolio is likely to have a realized volatility significantly exceeding 5%. As a result, the Index is likely to significantly underperform the U.S. Equity Futures Constituent in rising equity markets.

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The Index's allocation methodology may not be successful if the U.S. Equity Futures Constituent and the U.S. Treasury Futures Constituent decline at the same time. The Index's allocation methodology is premised on the U.S. Equity Futures Constituent and the U.S. Treasury Futures Constituent being either uncorrelated or inversely correlated. The thesis underlying the Index's allocation methodology is that, if the Index determines that the U.S. Equity Futures Constituent is likely to decline, the Index may avoid losses and even potentially generate positive returns by allocating exposure to the U.S. Treasury Futures Constituent instead of the U.S. Equity Futures Constituent. If, however, the U.S. Treasury Futures Constituent also declines, then the Index will decline regardless of whether its exposure is allocated to the U.S. Equity Futures Constituent or the U.S. Treasury Futures Constituent. If the U.S. Equity Futures Constituent and the U.S. Treasury Futures Constituent tend to decline at the same time-in other words, if they prove to be positively correlated-the Index's allocation methodology will not be successful, and the Index may experience significant declines.

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The Index will have significant exposure to the U.S. Treasury Futures Constituent, which has limited return potential and significant downside potential, particularly in times of rising interest rates. The U.S. Treasury Futures Constituent will be included in all three of the possible Portfolios, and in two of the three possible Portfolios it will be either 66.66% or 100% of the weight of that Portfolio. Accordingly, the Index will always be significantly allocated, and will frequently be predominantly or even 100% allocated, to the U.S. Treasury Futures Constituent. U.S. Treasury notes are generally viewed as low risk, low reward assets. Accordingly, the U.S. Treasury Futures Constituent offers only limited return potential, which in turn limits the return potential of the Index. Although U.S. Treasury notes themselves are generally viewed as safe assets, the U.S. Treasury Futures Constituent tracks the value of a futures contract on 10-Year U.S. Treasury Notes, which may be subject to significant fluctuations and declines. In particular, the value of a futures contract on 10-Year U.S. Treasury Notes is likely to decline if there is a general rise in interest rates. A general rise in interest rates is likely to lead to particularly large losses on the U.S. Treasury Futures Constituent because, in addition to reducing the value of the underlying U.S. Treasury notes, the rise in interest rates will increase the implicit financing cost discussed above.

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The Index fee will adversely affect Index performance. An index fee of 0.85% per annum is deducted in the calculation of the Index. The index fee will place a drag on the performance of the Index, offsetting any appreciation of the Selected Portfolio, exacerbating any depreciation of the Selected Portfolio and causing the level of the Index to decline steadily if the value of the Selected Portfolio remains relatively constant. The Index will not participate in any appreciation of the Selected Portfolio unless it is sufficiently great to offset the negative effects of the index fee, and then only to the extent that the favorable performance of the Selected Portfolio is greater than the index fee (and subject to the volatility-targeting feature). As a result of this deduction, the level of the Index may decline even if the Selected Portfolio appreciates.

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The Index may fail to maintain its volatility target and may experience large declines as a result. The Index adjusts its exposure to the Selected Portfolio as often as daily in an attempt to maintain a volatility target of 5%. If the volatility of the Selected Portfolio increases, the Index will reduce its exposure to the Selected Portfolio to the extent necessary to maintain a trailing 21-Day Realized Volatility of 5%. However, because this exposure adjustment is backward-looking, based on realized volatility over a prior period of 21 Index Business Days, there may be a time lag of several weeks before a sudden increase in volatility of the Selected Portfolio is sufficiently reflected in the trailing 21-Day Realized Volatility measure to result in a meaningful reduction in exposure to the Selected Portfolio. In the meantime, the Index may experience significantly more than 5% volatility and, if the increase in volatility is accompanied by a decline in the value of the Selected Portfolio, the Index may incur significant losses.

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The volatility-targeting feature is likely to cause the Index to significantly underperform the Selected Portfolio in rising equity markets. The performance of the Index will be based on the performance of the Selected Portfolio, but only to the extent that the Index has exposure to the Selected Portfolio. The Index will have less than 100% exposure to the Selected Portfolio at any time when the 21-Day Realized Volatility of the Selected Portfolio is greater than the Index's volatility target of 5%. The Index attempts to select the Equity-Focused Portfolio to be the Selected Portfolio during rising equity markets. The volatility of the Equity-Focused Portfolio is likely to be greater than the volatility target of 5% because the Equity-Focused Portfolio has 66.66% exposure to the U.S. Equity Futures Constituent, and based on historical data the volatility of the U.S. Equity Futures Constituent is likely to be significantly greater than 5%. As a result, at any time where the Selected Portfolio is the Equity-Focused Portfolio (if past patterns hold), the Index is likely to have less than 100% exposure to the performance of that Selected Portfolio. An exposure of less than 100% would mean that the Index will participate in only a limited degree of the performance of the Selected Portfolio, and the difference between 100% and that exposure would be hypothetically allocated to cash, on which no interest or other return will accrue. Limited exposure to the performance of the Selected Portfolio means that the Index is likely to underperform the Selected Portfolio in rising equity markets. The index fee will exacerbate this underperformance.

PS-13

Citigroup Global Markets Holdings Inc.

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A significant portion of the Index may be hypothetically allocated to cash, which may dampen returns. At any time when the Index has less than 100% exposure to the Selected Portfolio, a portion of the Index (corresponding to the difference between the exposure to the Selected Portfolio and 100%) will be hypothetically allocated to cash and will not accrue any interest or other return. A significant hypothetical allocation to cash will significantly reduce the Index's potential for gains. In addition, the index fee will be deducted from the entire Index, including the portion hypothetically allocated to cash. As a result, after taking into account the deduction of the index fee, any portion of the Index that is hypothetically allocated to cash will experience a net decline at a rate equal to the index fee.

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The volatility-targeting feature may cause the Index to perform poorly in temporary market crashes. A temporary market crash is an event in which the volatility of the Selected Portfolio spikes suddenly and the Selected Portfolio declines sharply in value over a short period of time, but the decline is short-lived and the Selected Portfolio soon recovers its losses. In this circumstance, although the value of the Selected Portfolio after the recovery may return to its value before the crash, the level of the Index may not fully recover its losses. This is because of the time lag that results from using a look-back period of 21 Index Business Days as the basis for the Index's volatility-targeting feature. Because of the time lag, the Index may not meaningfully reduce its exposure to the Selected Portfolio until the crash has already occurred, and by the time the reduced exposure does take effect, the recovery may have already begun. For example, if the Index has 50% exposure to the decline in the Selected Portfolio, and then reduces its exposure so that it has only 20% exposure to the recovery, the Index will end up significantly lower after the crash and recovery than it was before the crash.

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The performance of the Index will be highly sensitive to the specific parameters by which it is calculated. The Index is calculated pursuant to a rules-based methodology that contains a number of specific parameters. These parameters will be significant determinants of the performance of the Index.

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The Index will be calculated pursuant to a set of fixed rules and will not be actively managed. If the Index performs poorly, the Index Administrator will not change the rules in an attempt to improve performance. If the rules-based investment methodology tracked by the Index performs poorly, the Index Administrator will not change the rules in an attempt to improve performance.

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The Index has limited actual performance information. The Index launched on June 13, 2016. Accordingly, the Index has limited actual performance data. Because the Index is of recent origin with limited performance history, an investment linked to the Index may involve a greater risk than an investment linked to one or more indices with an established record of performance. A longer history of actual performance may have provided more reliable information on which to assess the validity of the Index's hypothetical investment methodology. However, any historical performance of the Index is not an indication of how the Index will perform in the future.

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Hypothetical back-tested Index performance information is subject to significant limitations. All information regarding the performance of the Index prior to June 13, 2016 is hypothetical and back-tested, as the Index did not exist prior to that time. It is important to understand that hypothetical back-tested Index performance information is subject to significant limitations, in addition to the fact that past performance is never a guarantee of future performance. In particular:

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The Index Administrator developed the rules of the Index with the benefit of hindsight-that is, with the benefit of being able to evaluate how the Index rules would have caused the Index to perform had it existed during the hypothetical back-tested period. The fact that the Index generally appreciated over the hypothetical back-tested period may not therefore be an accurate or reliable indication of any fundamental aspect of the Index methodology.

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The hypothetical back-tested performance of the Index might look different if it covered a different historical period. The market conditions that existed during the historical period covered by the hypothetical back-tested Index performance information are not necessarily representative of the market conditions that will exist in the future.

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Because the Constituents were not published during the entire period for which the Index Administrator has prepared hypothetical back-tested Index performance information, the hypothetical back-tested Index levels have been calculated by the Index Administrator based in part on hypothetical back-tested levels of the Constituents that were prepared by the index sponsor of the Constituents. The Index Administrator is not aware of the assumptions made by the index sponsor of the Constituents when it calculated the hypothetical back-tested index levels for the Constituents.

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The Index Administrator, which is our affiliate, and the Index Calculation Agent may exercise judgments under certain circumstances in the calculation of the Index. Although the Index is rules-based, there are certain circumstances under which the Index Administrator or Index Calculation Agent may be required to exercise judgment in calculating the Index as described in more detail in "Description of the Citi Dynamic Asset Selector 5 Excess Return Index" in the accompanying index supplement.

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Investors in the securitieswill not have any ownership or other interest in the futures contracts underlying the Constituents. The Selected Portfolio is described as a hypothetical investment portfolio because there is no actual portfolio of assets to which any investor is entitled or in which any investor has any ownership or other interest. The Index is merely a mathematical calculation that is performed by reference to hypothetical positions in the Constituents included in the Selected Portfolio, and the other Index rules, and each Constituent is merely a mathematical calculation that is performed by reference to hypothetical positions in the futures contracts included in such Constituent.

PS-14

Citigroup Global Markets Holdings Inc.

PS-15

Citigroup Global Markets Holdings Inc.

PS-16

Citigroup Global Markets Holdings Inc.

Citi Dynamic Asset Selector 5 Excess Return Index

S&P 500 Index (ER)

Barclays U.S. Aggregate Bond Index (ER)

Last 1 Year (since October 31, 2023)

9.2%

33.6%

4.7%

Last 3 Years (since October 29, 2021)

-1.4%

5.5%

-6.1%

Last 5 Years (since October 31, 2019)

1.0%

12.7%

-2.9%

PS-17

Citigroup Global Markets Holdings Inc.

PS-18

Citigroup Global Markets Holdings Inc.

(a)

the expression "retail investor" means a person who is one (or more) of the following:

(i)

a retail client as defined in point (11) of Article 4(1) of Directive 2014/65/EU (as amended, "MiFID II"); or

(ii)

a customer within the meaning of Directive 2002/92/EC, where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or

(iii)

not a qualified investor as defined in Directive 2003/71/EC; and

(b)

the expression "offer" includes the communication in any form and by any means of sufficient information on the terms of the offer and the securities offered so as to enable an investor to decide to purchase or subscribe the securities.

PS-19

Citigroup Global Markets Holdings Inc.

PS-20