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 product supplement, underlying 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 APRIL 25, 2024

Citigroup Global Markets Holdings Inc.

April --, 2024 Medium-Term Senior Notes, Series N Pricing Supplement No. 2024-USNCH[ ] Filed Pursuant to Rule 424(b)(2) Registration Statement Nos. 333-270327 and 333-270327-01

Dual Directional Buffer Securities Linked to the Worst Performing of the S&P 500^® Index and the S&P 500^® Equal Weight Index Due June 3, 2025

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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 and do not repay a fixed amount of principal at maturity. Instead, the securities offer a payment at maturity that may be greater than or less than the stated principal amount, depending on the performance of the worst performing of the underlyings specified below from its initial underlying value to its final underlying value.

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The securities offer modified exposure to the performance of the worst performing underlying, with (i) a digital (fixed) return at maturity so long as the final underlying value of the worst performing underlying is greater than or equal to its initial underlying value, (ii) the opportunity for a positive return at maturity if the worst performing underlying depreciates within a limited range (not more than the buffer percentage specified below) based on the absolute value of that depreciation and (iii) a limited buffer against any depreciation of the worst performing underlying in excess of the buffer percentage. In exchange for these features, investors in the securities must be willing to forgo (i) any appreciation of the underlying in excess of the digital return, (ii) any dividends with respect to the underlyings and (iii) any positive participation in the absolute value of any depreciation of the worst performing underlying if the worst performing underlying depreciates by more than the buffer percentage. In addition, investors in the securities must be willing to accept downside exposure to any depreciation of the worst performing underlying in excess of the buffer percentage. If the worst performing underlying depreciates by more than the buffer percentage from its initial underlying value to its final underlying value, you will lose 1% of the stated principal amount of your securities for every 1% by which that depreciation exceeds the buffer percentage.

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You will be subject to risks associated with each of the underlyings and will be negatively affected by adverse movements in any one of the underlyings.

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In order to obtain the modified exposure to the worst performing underlying 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.

Underlyings:	Underlying	Initial underlying value*	Final buffer value**
	S&P 500® Index
	S&P 500® Equal Weight Index
	*For each underlying, its closing value on the pricing date **For each underlying, 85% of its initial underlying value

Stated principal amount:	$1,000 per security
Pricing date:	April 29, 2024
Issue date:	May 2, 2024
Valuation date:	May 29, 2025, subject to postponement if such date is not a scheduled trading day or certain market disruption events occur
Maturity date:	June 3, 2025
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 or equal to its initial underlying value: $1,000 + the digital return amount ▪If the final underlying value of the worst performing underlying is less than its initial underlying value but greater than or equal to its final buffer value: $1,000 + the absolute return amount ▪If the final underlying value of the worst performing underlying is less than its final buffer value: $1,000 + [$1,000 × (the underlying return of the worst performing underlying + the buffer percentage)] If the final underlying value of the worst performing underlying is less than its final buffer value, you will receive less, and possibly significantly less, than the stated principal amount of your securities at maturity.
Final underlying value:	For each underlying, its closing value on the valuation date
Worst performing underlying:	The underlying with the lowest underlying return
Digital return amount:	$83.60 per security (representing a digital return equal to 8.36% of the stated principal amount). You will receive the digital return amount only if the final underlying value of the worst performing underlying is greater than or equal to its initial underlying value.
Absolute return amount:	$1,000 × the absolute value of the underlying return of the worst performing underlying
Underlying return:	For each underlying, (i) its final underlying value minus its initial underlying value, divided by (ii) its initial underlying value
Buffer percentage:	15%
Listing:	The securities will not be listed on any securities exchange
CUSIP / ISIN:	17331UGY7 / US17331UGY73
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	$6.50	$993.50
Total:	$	$	$

(1) Citigroup Global Markets Holdings Inc. currently expects that the estimated value of the securities on the pricing date will be at least $900.00 per security, which will be less than the issue price. The estimated value of the securities is based on CGMI's proprietary pricing models and our internal funding rate. It is not an indication of actual profit to CGMI or other of our affiliates, nor is it an indication of the price, if any, at which CGMI or any other person may be willing to buy the securities from you at any time after issuance. See "Valuation of the Securities" in this pricing supplement.

(2) CGMI will receive an underwriting fee of up to $6.50 for each security sold in this offering. The total underwriting fee and proceeds to issuer in the table above give effect to the actual total underwriting fee. For more information on the distribution of the securities, see "Supplemental Plan of Distribution" in this pricing supplement. In addition to the underwriting fee, CGMI and its affiliates may profit from expected hedging activity related to this offering, even if the value of the securities declines. See "Use of Proceeds and Hedging" in the accompanying prospectus.

(3) The per security proceeds to issuer indicated above represent the minimum per security proceeds to issuer for any security, assuming the maximum per security underwriting fee. As noted above, the underwriting fee is variable.

Investing in the securities involves risks not associated with an investment in conventional debt securities. See "Summary Risk Factors" beginning on page PS-7.

Neither the Securities and Exchange Commission (the "SEC") nor any state securities commission has approved or disapproved of the securities or determined that this pricing supplement and the accompanying product supplement, underlying supplement, prospectus supplement and prospectus are truthful or complete. Any representation to the contrary is a criminal offense.

You should read this pricing supplement together with the accompanying product supplement, underlying supplement, prospectus supplement and prospectus, which can be accessed via the hyperlinks below:

Product Supplement No. EA-02-10 dated March 7, 2023Underlying Supplement No. 11 dated March 7, 2023
Prospectus Supplement and Prospectus each dated March 7, 2023
The securities are not bank deposits and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency, nor are they obligations of, or guaranteed by, a bank.

Additional Information

The terms of the securities are set forth in the accompanying product supplement, prospectus supplement and prospectus, as supplemented by this pricing supplement. The accompanying product supplement, prospectus supplement and prospectus contain important disclosures that are not repeated in this pricing supplement. For example, the accompanying product supplement contains important information about how the closing value of each underlying will be determined and about adjustments that may be made to the terms of the securities upon the occurrence of market disruption events and other specified events with respect to each underlying. The accompanying underlying supplement contains information about each underlying that is not repeated in this pricing supplement. It is important that you read the accompanying product supplement, underlying supplement, prospectus supplement and prospectus together with this pricing supplement in deciding whether to invest in the securities. Certain terms used but not defined in this pricing supplement are defined in the accompanying product supplement.

Payout Diagram

The diagram below illustrates your payment at maturity for a range of hypothetical underlying returns of the worst performing underlying.

Investors in the securities will not receive any dividends with respect to the underlyings. The diagram and examples below do not show any effect of lost dividend yield over the term of the securities. See "Summary Risk Factors-You will not receive dividends or have any other rights with respect to the underlyings" below.

Payout Diagram
n The Securities	n The Worst Performing Underlying

Hypothetical Examples

The table below indicates what your payment at maturity and total return on the securities would be for various hypothetical underlying returns of the worst performing underlying. Your actual payment at maturity and total return on the securities will depend on the actual final underlying value of the worst performing underlying.

Hypothetical Underlying Return of the Worst Performing Underlying	Hypothetical Payment at Maturity per Security	Hypothetical Total Return on Securities at Maturity(1)
100.00%	$1,083.60	8.36%
75.00%	$1,083.60	8.36%
50.00%	$1,083.60	8.36%
25.00%	$1,083.60	8.36%
10.00%	$1,083.60	8.36%
0.00%	$1,083.60	8.36%
-1.00%	$1,010.00	1.00%
-10.00%	$1,100.00	10.00%
-15.00%	$1,150.00	15.00%
-15.01%	$999.90	-0.01%
-30.00%	$850.00	-15.00%
-40.00%	$750.00	-25.00%
-50.00%	$650.00	-35.00%
-75.00%	$400.00	-60.00%
-100.00%	$150.00	-85.00%

⁽¹⁾ Hypothetical total return on securities at maturity = (i) hypothetical payment at maturity per security minus $1,000 stated principal amount per security, divided by (ii) $1,000 stated principal amount per security

The examples below illustrate how to determine the payment at maturity on the securities, assuming the various hypothetical final underlying values indicated below. The examples are solely for illustrative purposes, do not show all possible outcomes and are not a prediction of what the actual payment at maturity on the securities will be. The actual payment at maturity will depend on the actual final underlying value of the worst performing underlying.

The examples below are based on the following hypothetical values and do not reflect the actual initial underlying values or final buffer values of the underlyings. For the actual initial underlying value and final buffer value of each underlying, see the cover page of this pricing supplement. We have used these hypothetical values, rather than the actual values, to simplify the calculations and aid understanding of how the securities work. However, you should understand that the actual payment at maturity on the securities will be calculated based on the actual initial underlying value and final buffer value of each underlying, and not the hypothetical values indicated below. The examples below assume that the digital return amount will be set at the lowest value indicated on the cover page of this pricing supplement. The actual digital return amount will be determined on the pricing date.

Underlying	Hypothetical initial underlying value	Hypothetical final buffer value
S&P 500® Index	100	85 (85% of its hypothetical initial underlying value)
S&P 500® Equal Weight Index	100	85 (85% of its hypothetical initial underlying value)

Example 1-Upside Scenario A. The final underlying value of the worst performing underlying is 110, resulting in a 10% underlying return for the worst performing underlying. In this example, the final underlying value of the worst performing underlying is greater than its initial underlying value.

Underlying	Hypothetical final underlying value	Hypothetical underlying return
S&P 500® Index*	110	10%
S&P 500® Equal Weight Index	150	50%

*Worst performing underlying

Payment at maturity per security = $1,000 + the digital return amount

= $1,000 + $83.60

= $1,083.60

In this scenario, because the final underlying value of the worst performing underlying is greater than its initial underlying value, your total return at maturity would equal the digital return amount.

Example 2-Upside Scenario B. The final underlying value of the worst performing underlying is 150, resulting in a 50% underlying return for the worst performing underlying. In this example, the final underlying value of the worst performing underlying is greater than its initial underlying value.

Underlying	Hypothetical final underlying value	Hypothetical underlying return
S&P 500® Index*	150	50%
S&P 500® Equal Weight Index	170	70%

*Worst performing underlying

Payment at maturity per security = $1,000 + the digital return amount

= $1,000 + $83.60

= $1,083.60

In this scenario, because the final underlying value of the worst performing underlying is greater than its initial underlying value, your total return at maturity would equal the digital return amount. In this scenario, the digital return amount is less than the underlying return of the worst performing underlying, and as a result an investment in the securities would underperform a hypothetical alternative investment providing 1-to-1 exposure to the appreciation of the worst performing underlying.

Example 3-Upside Scenario C. The final underlying value of the worst performing underlying is 90, resulting in a -10% underlying return for the worst performing underlying. In this example, the final underlying value of the worst performing underlying is less than its initial underlying value but greater than its final buffer value.

Underlying	Hypothetical final underlying value	Hypothetical underlying return
S&P 500® Index*	90	-10%
S&P 500® Equal Weight Index	120	20%

*Worst performing underlying

Payment at maturity per security = $1,000 + the absolute return amount

= $1,000 + ($1,000 × the absolute value of the underlying return of the worst performing underlying)

= $1,000 + ($1,000 × |-10%|)

= $1,000 + $100.00

= $1,100.00

In this scenario, the worst performing underlying has depreciated from its initial underlying value to its final underlying value, but not by more than the buffer percentage. As a result, your total return at maturity in this scenario would reflect 1-to-1 positive exposure to the absolute value of the negative performance of the worst performing underlying.

Example 4-Downside Scenario. The final underlying value of the worst performing underlying is 30, resulting in a -70% underlying return for the worst performing underlying. In this example, the final underlying value of the worst performing underlying is less than its final buffer value.

Underlying	Hypothetical final underlying value	Hypothetical underlying return
S&P 500® Index	120	20%
S&P 500® Equal Weight Index*	30	-70%

*Worst performing underlying

Payment at maturity per security = $1,000 + [$1,000 × (the underlying return of the worst performing underlying + the buffer percentage)]

= $1,000 + [$1,000 × (-70% + 15%)]

= $1,000 + [$1,000 × -55%]

= $1,000 + -$550.00

= $450.00

In this scenario, the worst performing underlying has depreciated from its initial underlying value to its final underlying value by more than the buffer percentage. As a result, your total return at maturity in this scenario would be negative and would reflect 1-to-1 exposure to the negative performance of the worst performing underlying beyond the buffer percentage.

Summary Risk Factors

An investment in the securities is significantly riskier than an investment in conventional debt securities. The securities are subject to all of the risks associated with an investment in our conventional debt securities (guaranteed by Citigroup Inc.), including the risk that we and Citigroup Inc. may default on our obligations under the securities, and are also subject to risks associated with each underlying. Accordingly, the securities are suitable only for investors who are capable of understanding the complexities and risks of the securities. You should consult your own financial, tax and legal advisors as to the risks of an investment in the securities and the suitability of the securities in light of your particular circumstances.

The following is a summary of certain key risk factors for investors in the securities. You should read this summary together with the more detailed description of risks relating to an investment in the securities contained in the section "Risk Factors Relating to the Securities" beginning on page EA-7 in the accompanying product supplement. You should also carefully read the risk factors included in the accompanying prospectus supplement and in the documents incorporated by reference in the accompanying prospectus, including Citigroup Inc.'s most recent Annual Report on Form 10-K and any subsequent Quarterly Reports on Form 10-Q, which describe risks relating to the business of Citigroup Inc. more generally.

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You may lose a significant portion of your investment. Unlike conventional debt securities, the securities do not repay a fixed amount of principal at maturity. Instead, your payment at maturity will depend on the performance of the worst performing underlying. If the worst performing underlying depreciates by more than the buffer percentage from its initial underlying value to its final underlying value, the absolute return feature will no longer be available and you will lose 1% of the stated principal amount of your securities for every 1% by which that depreciation exceeds the buffer percentage.

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Your potential return on the securities is limited. Your potential total return on the securities at maturity is limited to the digital return, even if the worst performing underlying appreciates by significantly more than the digital return. If the worst performing underlying appreciates by more than the digital return, the securities will underperform an alternative investment providing 1-to-1 exposure to the performance of the worst performing underlying. When lost dividends are taken into account, the securities may underperform an alternative investment providing 1-to-1 exposure to the performance of the worst performing underlying even if the worst performing underlying appreciates by less than the digital return.

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Your potential for positive return from depreciation of the worst performing underlying is limited. The return potential of the securities in the event that the final underlying value of the worst performing underlying is less than its initial underlying value is limited by the final buffer value. Any decline in the final underlying value of the worst performing underlying below its final buffer value will result in a loss, rather than a positive return, on the securities.

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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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The securities are subject to heightened risk because they have multiple underlyings. The securities are more risky than similar investments that may be available with only one underlying. With multiple underlyings, there is a greater chance that any one underlying will perform poorly, adversely affecting your return on the securities.

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The securities are subject to the risks of each of the underlyings and will be negatively affected if any one underlying performs poorly. You are subject to risks associated with each of the underlyings. If any one underlying performs poorly, you will be negatively affected. The securities are not linked to a basket composed of the underlyings, where the blended performance of the underlyings would be better than the performance of the worst performing underlying alone. Instead, you are subject to the full risks of whichever of the underlyings is the worst performing underlying.

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You will not benefit in any way from the performance of any better performing underlying. The return on the securities depends solely on the performance of the worst performing underlying, and you will not benefit in any way from the performance of any better performing underlying.

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You will be subject to risks relating to the relationship between the underlyings. It is preferable from your perspective for the underlyings to be correlated with each other, in the sense that their closing values tend to increase or decrease at similar times and by similar magnitudes. By investing in the securities, you assume the risk that the underlyings will not exhibit this relationship. The less correlated the underlyings, the more likely it is that any one of the underlyings will perform poorly over the term of the securities. All that is necessary for the securities to perform poorly is for one of the underlyings to perform poorly. It is impossible to predict what the relationship between the underlyings will be over the term of the securities. The underlyings differ in significant ways and, therefore, may not be correlated with each other.

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You will not receive dividends or have any other rights with respect to the underlyings. You will not receive any dividends with respect to the underlyings. This lost dividend yield may be significant over the term of the securities. The payment scenarios described in this pricing supplement do not show any effect of lost dividend yield over the term of the securities. In addition, you will not have voting rights or any other rights with respect to the underlyings or the stocks included in the underlyings.

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Your payment at maturity depends on the closing value of the worst performing underlying on a single day. Because your payment at maturity depends on the closing value of the worst performing underlying solely on the valuation date, you are subject

to the risk that the closing value of the worst performing underlying 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 directly in the underlyings or in another instrument linked to the worst performing underlying that you could sell for full value at a time selected by you, or if the payment at maturity were based on an average of closing values of the worst performing underlying, 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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The estimated value of the securities on the pricing date, based on CGMI's proprietary pricing models and our internal funding rate, is 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, and correlation between, the closing values of the underlyings, dividend yields on the underlyings 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.

Because there is not an active market for traded instruments referencing our outstanding debt obligations, CGMI determines our secondary market rate based on the market price of traded instruments referencing the debt obligations of Citigroup Inc., our parent company and the guarantor of all payments due on the securities, but subject to adjustments that CGMI makes in its sole discretion. As a result, our secondary market rate is not a market-determined measure of our creditworthiness, but rather reflects the market's perception of our parent company's creditworthiness as adjusted for discretionary factors such as CGMI's preferences with respect to purchasing the securities prior to maturity.

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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 values of the underlyings, the volatility of, and correlation between, the closing values of the underlyings, dividend yields on the underlyings, interest rates generally, the time remaining to maturity and our and Citigroup Inc.'s creditworthiness, as reflected in our secondary market rate, among other factors described under "Risk Factors Relating to the Securities-Risk Factors Relating to All Securities-The value of your securities prior to maturity will fluctuate based on many unpredictable factors" in the accompanying product supplement. Changes in the closing values of the underlyings 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.

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Our offering of the securities is not a recommendation of any underlying. The fact that we are offering the securities does not mean that we believe that investing in an instrument linked to the underlyings is likely to achieve favorable returns. In fact, as we are part of a global financial institution, our affiliates may have positions (including short positions) in the underlyings or in instruments related to the underlyings, and may publish research or express opinions, that in each case are inconsistent with an investment linked to the underlyings. These and other activities of our affiliates may affect the closing values of the underlyings in a way that negatively affects the value of and your return on the securities.

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The closing value of an underlying may be adversely affected by our or our affiliates' hedging and other trading activities. We expect to hedge our obligations under the securities through CGMI or other of our affiliates, who may take positions in the underlyings or in financial instruments related to the underlyings and may adjust such positions during the term of the securities. Our affiliates also take positions in the underlyings or in financial instruments related to the underlyings on a regular basis (taking long or short positions or both), for their accounts, for other accounts under their management or to facilitate transactions on behalf of customers. These activities could affect the closing values of the underlyings in a way that negatively affects the value of and your return on the securities. They could also result in substantial returns for us or our affiliates while the value of the securities declines.

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We and our affiliates may have economic interests that are adverse to yours as a result of our affiliates' business activities. Our affiliates engage in business activities with a wide range of companies. These activities include extending loans, making and facilitating investments, underwriting securities offerings and providing advisory services. These activities could involve or affect the underlyings in a way that negatively affects the value of and your return on the securities. They could also result in substantial returns for us or our affiliates while the value of the securities declines. In addition, in the course of this business, we or our affiliates may acquire non-public information, which will not be disclosed to you.

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The calculation agent, which is an affiliate of ours, will make important determinations with respect to the securities. If certain events occur during the term of the securities, such as market disruption events and other events with respect to an underlying, CGMI, as calculation agent, will be required to make discretionary judgments that could significantly affect your return on the securities. In making these judgments, the calculation agent's interests as an affiliate of ours could be adverse to your interests as a holder of the securities. See "Risk Factors Relating to the Securities-Risk Factors Relating to All Securities-The calculation agent, which is an affiliate of ours, will make important determinations with respect to the securities" in the accompanying product supplement.

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Changes that affect the underlyings may affect the value of your securities. The sponsors of the underlyings may at any time make methodological changes or other changes in the manner in which they operate that could affect the values of the underlyings. We are not affiliated with any such underlying sponsor and, accordingly, we have no control over any changes any such sponsor may make. Such changes could adversely affect the performance of the underlyings and the value of and your return on the securities.

▪The U.S. federal tax consequences of an investment in the securities are unclear. There is no direct legal authority regarding the proper U.S. federal tax treatment of the securities, and we do not plan to request a ruling from the Internal Revenue Service (the "IRS"). Consequently, significant aspects of the tax treatment of the securities are uncertain, and the IRS or a court might not agree with the treatment of the securities as prepaid forward contracts. If the IRS were successful in asserting an alternative treatment of the securities, the tax consequences of the ownership and disposition of the securities might be materially and adversely affected. For example, as discussed below, there is a substantial risk that the IRS could seek to treat the securities as debt instruments. Moreover, future legislation, Treasury regulations or IRS guidance could adversely affect the U.S. federal tax treatment of the securities, possibly retroactively.

If you are a non-U.S. investor, you should review the discussion of withholding tax issues in "United States Federal Tax Considerations-Non-U.S. Holders" below.

You should read carefully the discussion under "United States Federal Tax Considerations" and "Risk Factors Relating to the Securities" in the accompanying product supplement and "United States Federal Tax Considerations" in this pricing supplement. You should also consult your tax adviser regarding the U.S. federal tax consequences of an investment in the securities, as well as tax consequences arising under the laws of any state, local or non-U.S. taxing jurisdiction.

Information About the S&P 500^® Index

The S&P 500^® Index consists of the common stocks of 500 issuers selected to provide a performance benchmark for the large capitalization segment of the U.S. equity markets. It is calculated and maintained by S&P Dow Jones Indices LLC.

Please refer to the section "Equity Index Descriptions- The S&P U.S. Indices" in the accompanying underlying supplement for additional information.

We have derived all information regarding the S&P 500^® Index from publicly available information and have not independently verified any information regarding the S&P 500^® Index. This pricing supplement relates only to the securities and not to the S&P 500^® Index. We make no representation as to the performance of the S&P 500^® Index over the term of the securities.

The securities represent obligations of Citigroup Global Markets Holdings Inc. (guaranteed by Citigroup Inc.) only. The sponsor of the S&P 500^® Index is not involved in any way in this offering and has no obligation relating to the securities or to holders of the securities.

Historical Information

The closing value of the S&P 500^® Index on April 23, 2024 was 5,070.55.

The graph below shows the closing value of the S&P 500^® Index for each day such value was available from January 2, 2014 to April 23, 2024. We obtained the closing values from Bloomberg L.P., without independent verification. You should not take historical closing values as an indication of future performance.

S&P 500® Index - Historical Closing Values January 2, 2014 to April 23, 2024

Information About the S&P 500^® Equal Weight Index

The S&P 500^® Equal Weight Index is the equal-weight version of the S&P 500^® Index. The S&P 500^® Equal Weight Index includes the same constituents as the capitalization weighted S&P 500^® Index. The S&P 500^® Equal Weight Index is calculated and maintained by S&P Dow Jones Indices LLC.

Please refer to the section "Annex A" in this pricing supplement for additional information.

We have derived all information regarding the S&P 500^® Equal Weight Index from publicly available information and have not independently verified any information regarding the S&P 500^® Equal Weight Index. This pricing supplement relates only to the securities and not to the S&P 500^® Equal Weight Index. We make no representation as to the performance of the S&P 500^® Equal Weight Index over the term of the securities.

The securities represent obligations of Citigroup Global Markets Holdings Inc. (guaranteed by Citigroup Inc.) only. The sponsor of the S&P 500^® Equal Weight Index is not involved in any way in this offering and has no obligation relating to the securities or to holders of the securities.

Historical Information

The closing value of the S&P 500^® Equal Weight Index on April 23, 2024 was 6,587.74.

The graph below shows the closing value of the S&P 500^® Equal Weight Index for each day such value was available from January 2, 2014 to April 23, 2024. We obtained the closing values from Bloomberg L.P., without independent verification. You should not take historical closing values as an indication of future performance.

S&P 500® Equal Weight Index - Historical Closing Values January 2, 2014 to April 23, 2024

United States Federal Tax Considerations

You should read carefully the discussion under "United States Federal Tax Considerations" and "Risk Factors Relating to the Securities" in the accompanying product supplement and "Summary Risk Factors" in this pricing supplement.

Due to the lack of any controlling legal authority, there is substantial uncertainty regarding the U.S. federal income tax consequences of an investment in the securities. In the opinion of our counsel, Davis Polk & Wardwell LLP, it is reasonable under current law to treat a security as a prepaid forward contract for U.S. federal income tax purposes. However, our counsel has advised us that it is unable to conclude affirmatively that this treatment is more likely than not to be upheld, and that alternative treatments are possible. Moreover, our counsel's opinion is based on market conditions as of the date of this preliminary pricing supplement and is subject to confirmation on the pricing date.

Assuming this treatment of the securities is respected and subject to the discussion in "United States Federal Tax Considerations" in the accompanying product supplement, the following U.S. federal income tax consequences should result under current law:

·	You should not recognize taxable income over the term of the securities prior to maturity, other than pursuant to a sale or exchange.

·

Upon a sale or exchange of a security (including retirement at maturity), you should recognize capital gain or loss equal to the difference between the amount realized and your tax basis in the security. Such gain or loss should be long-term capital gain or loss if you held the security for more than one year.

We do not plan to request a ruling from the IRS regarding the treatment of the securities. An alternative characterization of the securities could materially and adversely affect the tax consequences of ownership and disposition of the securities, including the timing and character of income recognized. In particular, due to the terms of the securities, there is a substantial risk that the IRS could seek to treat the securities as debt instruments for U.S. federal income tax purposes. In that event, you would be required to accrue into income original issue discount on the securities every year at a "comparable yield" determined as of the time of issuance and recognize all income and gain in respect of the securities as ordinary income. In addition, the U.S. Treasury Department and the IRS have requested comments on various issues regarding the U.S. federal income tax treatment of "prepaid forward contracts" and similar financial instruments and have indicated that such transactions may be the subject of future regulations or other guidance. Furthermore, members of Congress have proposed legislative changes to the tax treatment of derivative contracts. Any legislation, Treasury regulations or other guidance promulgated after consideration of these issues could materially and adversely affect the tax consequences of an investment in the securities, possibly with retroactive effect. You should consult your tax adviser regarding possible alternative tax treatments of the securities and potential changes in applicable law.

Non-U.S. Holders. Subject to the discussions below and in "United States Federal Tax Considerations" in the accompanying product supplement, if you are a Non-U.S. Holder (as defined in the accompanying product supplement) of the securities, you generally should not be subject to U.S. federal withholding or income tax in respect of any amount paid to you with respect to the securities, provided that (i) income in respect of the securities is not effectively connected with your conduct of a trade or business in the United States, and (ii) you comply with the applicable certification requirements.

As discussed under "United States Federal Tax Considerations-Tax Consequences to Non-U.S. Holders" in the accompanying product supplement, Section 871(m) of the Code and Treasury regulations promulgated thereunder ("Section 871(m)") generally impose a 30% withholding tax on dividend equivalents paid or deemed paid to Non-U.S. Holders with respect to certain financial instruments linked to U.S. equities ("U.S. Underlying Equities") or indices that include U.S. Underlying Equities. Section 871(m) generally applies to instruments that substantially replicate the economic performance of one or more U.S. Underlying Equities, as determined based on tests set forth in the applicable Treasury regulations. However, the regulations, as modified by an IRS notice, exempt financial instruments issued prior to January 1, 2025 that do not have a "delta" of one. Based on the terms of the securities and representations provided by us as of the date of this preliminary pricing supplement, our counsel is of the opinion that the securities should not be treated as transactions that have a "delta" of one within the meaning of the regulations with respect to any U.S. Underlying Equity and, therefore, should not be subject to withholding tax under Section 871(m). However, the final determination regarding the treatment of the securities under Section 871(m) will be made as of the pricing date for the securities, and it is possible that the securities will be subject to withholding tax under Section 871(m) based on the circumstances as of that date.

A determination that the securities are not subject to Section 871(m) is not binding on the IRS, and the IRS may disagree with this treatment. Moreover, Section 871(m) is complex and its application may depend on your particular circumstances, including your other transactions. You should consult your tax adviser regarding the potential application of Section 871(m) to the securities.

If withholding tax applies to the securities, we will not be required to pay any additional amounts with respect to amounts withheld.

You should read the section entitled "United States Federal Tax Considerations" in the accompanying product supplement. The preceding discussion, when read in combination with that section, constitutes the full opinion of Davis Polk & Wardwell LLP regarding the material U.S. federal tax consequences of owning and disposing of the securities.

You should also consult your tax adviser regarding all aspects of the U.S. federal income and estate tax consequences of an investment in the securities and any tax consequences arising under the laws of any state, local or non-U.S. taxing jurisdiction.

Supplemental Plan of Distribution

CGMI, an affiliate of Citigroup Global Markets Holdings Inc. and the underwriter of the sale of the securities, is acting as principal and will receive an underwriting fee of up to $6.50 for each security sold in this offering. The actual underwriting fee will be equal to the selling concession provided to selected dealers, as described in this paragraph. From this underwriting fee, CGMI will pay selected dealers not affiliated with CGMI a variable selling concession of up to $6.50 for each security they sell.

See "Plan of Distribution; Conflicts of Interest" in the accompanying product supplement and "Plan of Distribution" in each of the accompanying prospectus supplement and prospectus for additional information.

Valuation of the Securities

CGMI calculated the estimated value of the securities set forth on the cover page of this pricing supplement based on proprietary pricing models. CGMI's proprietary pricing models generated an estimated value for the securities by estimating the value of a hypothetical package of financial instruments that would replicate the payout on the securities, which consists of a fixed-income bond (the "bond component") and one or more derivative instruments underlying the economic terms of the securities (the "derivative component"). CGMI calculated the estimated value of the bond component using a discount rate based on our internal funding rate. CGMI calculated the estimated value of the derivative component based on a proprietary derivative-pricing model, which generated a theoretical price for the instruments that constitute the derivative component based on various inputs, including the factors described under "Summary Risk Factors-The value of the securities prior to maturity will fluctuate based on many unpredictable factors" in this pricing supplement, but not including our or Citigroup Inc.'s creditworthiness. These inputs may be market-observable or may be based on assumptions made by CGMI in its discretionary judgment.

The estimated value of the securities is a function of the terms of the securities and the inputs to CGMI's proprietary pricing models. As of the date of this preliminary pricing supplement, it is uncertain what the estimated value of the securities will be on the pricing date and because it is uncertain what the values of the inputs to CGMI's proprietary pricing models will be on the pricing date.

For a period of approximately three months following issuance of the securities, the price, if any, at which CGMI would be willing to buy the securities from investors, and the value that will be indicated for the securities on any brokerage account statements prepared by CGMI or its affiliates (which value CGMI may also publish through one or more financial information vendors), will reflect a temporary upward adjustment from the price or value that would otherwise be determined. This temporary upward adjustment represents a portion of the hedging profit expected to be realized by CGMI or its affiliates over the term of the securities. The amount of this temporary upward adjustment will decline to zero on a straight-line basis over the three-month temporary adjustment period. However, CGMI is not obligated to buy the securities from investors at any time. See "Summary Risk Factors-The securities will not be listed on any securities exchange and you may not be able to sell them prior to maturity."

^© 2024 Citigroup Global Markets Inc. All rights reserved. Citi and Citi and Arc Design are trademarks and service marks of Citigroup Inc. or its affiliates and are used and registered throughout the world.

Annex A

Description of the S&P 500^® Equal Weight Index

The S&P 500^® Equal Weight Index

The S&P 500^® Equal Weight Index is calculated, maintained and published by S&P Dow Jones Indices LLC ("S&P Dow Jones"). All information contained in this pricing supplement regarding the S&P 500^® Equal Weight Index, including, without limitation, its make-up, method of calculation and changes in its components, has been derived from publicly available information, without independent verification. This information reflects the policies of, and is subject to change by, S&P Dow Jones. S&P Dow Jones has no obligation to continue to publish, and may discontinue the publication of, the S&P 500^® Equal Weight Index. The securities represent obligations of Citigroup Global Markets Holdings Inc. (guaranteed by Citigroup Inc.) only. S&P Dow Jones is not involved in any way in this offering and has no obligation relating to the securities or to holders of the securities.

The S&P 500^® Equal Weight Index began publishing on January 8, 2003 and has a base date of December 29, 1989. The price return version of the S&P 500^® Equal Weight Index is reported by Bloomberg, L.P. under the ticker symbol "SPW."

The S&P 500^® Equal Weight Index is designed to be the size-neutral version of the S&P 500^® Index. The S&P 500^® Equal Weight Index employs the same eligibility criteria and constituent changes as the S&P 500^® Index, and the S&P 500^® Equal Weight Index has the same constituents as the S&P 500^® Index. At each quarterly rebalancing, each constituent of the S&P 500^® Equal Weight Index is allocated the same weight as every other constituent in the index.

Index Construction

The S&P 500^® Equal Weight Index is an equal-weighted version of the S&P 500^® Index. Index composition is the same as the S&P 500^® Index. Constituent changes are incorporated in the S&P 500^® Equal Weight Index as and when they are made in the S&P 500^® Index. For additional information about the S&P 500^® Index, including the methodology for inclusion in the S&P 500^® Index, see "Equity Index Descriptions-The S&P U.S. Indices" in the accompanying underlying supplement.

When a company is added to the S&P 500^® Equal Weight Index in the middle of the quarter, it takes the weight of the company that it replaced. The one exception is when a company is removed from the S&P 500^® Equal Weight Index at a price of $0.00. In such a case, the company's replacement is added to the index at the weight using the previous day's closing value, or the most immediate prior business day that the deleted company was not valued at $0.00.

Weighting

The S&P 500^® Equal Weight Index is an equal-weighted index, meaning an index where every stock, or company, has the same weight in the index. As stock prices move, the weights will shift and exact equality will be lost. Therefore, an equal weighted index must be rebalanced from time to time to re-establish the proper weighting.

The S&P 500^® Equal Weight Index is reset to equal weight quarterly after the close of business on the third Friday of March, June, September, and December. The reference date for weighting is the second Friday of the reweighting month and changes are effective after the close of the following Friday using prices as of the reweighting reference date, and membership, shares outstanding, and investable weight factors ("IWF") as of the reweighting effective date. For those companies having multiple share class lines in the index, each share class line is assigned a weight that is proportional to its float-adjusted market capitalization as of the second Friday pricing reference date. Since index shares are assigned based on prices one week prior to the rebalancing, the actual weight of each company at the rebalancing differs from the target equal weights due to market movements.

Index Calculation

The overall approach to calculate the value of the S&P 500^® Equal Weight Index is the same as the S&P 500^® Index; except that each constituent's market value in the S&P 500^® Index is multiplied by its additional weight factor (AWF). The AWF is a number used to convert a constituent's market value in the S&P 500^® Index into an equal weight in the S&P 500^® Equal Weight Index at the most recent quarterly rebalancing, while maintaining the total market value of the S&P 500^® Index. Between quarterly rebalancings, the AWFs are fixed and therefore the weights of the constituents in the S&P 500^® Equal Weight Index will shift as constituent prices increase or decrease. In order to re-establish equal weighting, new AWFs are calculated on a quarterly basis.

Index Maintenance

Several types of corporate actions, and their related treatment, are listed in the table below.

Corporate Action

Treatment

Company addition/deletion

Fixed Component Count Index Treatment (Stock Replacements) The company entering the index goes in at the weight of the company coming out. If a company is being removed at a price of $0.00, the replacement goes in at the weight of the deleted company at the close on the day before the effective date. If more than one company is being replaced in the index on a single date, the replacements are added in the order specified in the client announcement. There will be no change in index market capitalization and no divisor change for stock replacements except where a company is removed at a price of zero as noted above. Deletion The weights of all stocks in the index will proportionately change, due to the absolute change in the number of index constituents. Relative weights will stay the same. The index divisor will change due to the net change in the index market capitalization

Change in shares outstanding	Shares outstanding changes are offset by an AWF. There is no change to the index market capitalization and no divisor adjustment.
Split/reverse split	Shares outstanding are adjusted by split ratio. Stock price is adjusted by split ratio. There is no change to the index market capitalization and no divisor adjustment.
Change in IWF	IWF changes are offset by an AWF. There is no change to the index market capitalization and no divisor adjustment.
Special dividend	The stock price is adjusted by the amount of the dividend. The net change to the index market capitalization causes a divisor adjustment
Rights offering	All rights offerings that are in the money on the ex-date are applied under the assumption the rights are fully subscribed. The stock price is adjusted by the value of the rights and the shares outstanding are increased by the rights ratio. The change in price and shares is offset by an AWF to keep the index market capitalization (stock weight) unchanged. There is no change to the index market capitalization and no divisor adjustment.

Comparison of Historical S&P 500^® Equal Weight Index Performance Against Historical S&P 500^® Index Performance

The following graph sets forth a comparison of the historical performance of the S&P 500^® Equal Weight Index against the historical performance of the S&P 500^® Index from January 2, 2014 through April 23, 2024, each normalized to have a closing value of 100.00 on January 2, 2014 to facilitate a comparison. In the graph below, references to "SPW" are to the S&P 500^® Equal Weight Index and references to "SPX" are to the S&P 500^® Index.

PAST PERFORMANCE OF THE S&P 500^® EQUAL WEIGHT INDEX AND RELATIVE PERFORMANCE BETWEEN THE S&P 500^® EQUAL WEIGHT INDEX AND THE S&P 500^® INDEX ARE NOT INDICATIVE OF FUTURE PERFORMANCE

License Agreement

S&P Dow Jones and Citigroup Global Markets Inc. have entered into a non-exclusive license agreement providing for the license to Citigroup Inc. and its other affiliates, in exchange for a fee, of the right to use indices owned and published by S&P Dow Jones in connection with certain financial products, including the securities. "Standard & Poor's" and "S&P" are trademarks of Standard & Poor's Financial Services LLC ("S&P"). "Dow Jones" is a registered trademark of Dow Jones Trademark Holdings, LLC ("Dow Jones"). Trademarks have been licensed to S&P Dow Jones and have been licensed for use by Citigroup Inc. and its affiliates.

The license agreement between S&P Dow Jones and Citigroup Global Markets Inc. provides that the following language must be stated in this pricing supplement:

"The securities are not sponsored, endorsed, sold or promoted by S&P Dow Jones, Dow Jones, S&P or their respective affiliates (collectively, "S&P Dow Jones Indices"). S&P Dow Jones Indices make no representation or warranty, express or implied, to the holders of the securities or any member of the public regarding the advisability of investing in securities generally or in the securities particularly. S&P Dow Jones Indices' only relationship to Citigroup Inc. and its affiliates (other than transactions entered into in the ordinary course of business) is the licensing of certain trademarks, trade names and service marks of S&P Dow Jones Indices and of the S&P 500^® Equal Weight Index, which is determined, composed and calculated by S&P Dow Jones Indices without regard to Citigroup Inc., its affiliates or the securities. S&P Dow Jones Indices have no obligation to take the needs of Citigroup Inc., its affiliates or the holders of the securities into consideration in determining, composing or calculating the S&P 500^® Equal Weight Index. S&P Dow Jones Indices are not responsible for and have not participated in the determination of the timing of, prices at or quantities of the securities to be issued or in the determination or calculation of the equation by which the securities are to be converted into cash. S&P Dow Jones Indices have no obligation or liability in connection with the administration, marketing or trading of the securities.

S&P DOW JONES INDICES DO NOT GUARANTEE THE ACCURACY AND/OR THE COMPLETENESS OF THE S&P 500^® EQUAL WEIGHT INDEX OR ANY DATA INCLUDED THEREIN AND S&P DOW JONES INDICES SHALL HAVE NO LIABILITY FOR ANY ERRORS, OMISSIONS, OR INTERRUPTIONS THEREIN. S&P DOW JONES INDICES MAKE NO WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY CITIGROUP INC., HOLDERS OF THE SECURITIES, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE S&P 500^® EQUAL WEIGHT INDEX OR ANY DATA INCLUDED THEREIN. S&P DOW JONES INDICES MAKE NO EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIM ALL WARRANTIES, OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE WITH RESPECT TO THE S&P 500^® EQUAL WEIGHT INDEX OR ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL S&P DOW JONES INDICES HAVE ANY LIABILITY FOR ANY LOST PROFITS OR INDIRECT, PUNITIVE, SPECIAL OR CONSEQUENTIAL DAMAGES, EVEN IF NOTIFIED OF THE POSSIBILITY THEREOF. THERE ARE NO THIRD PARTY BENEFICIARIES OF ANY AGREEMENTS OR ARRANGEMENTS BETWEEN S&P DOW JONES INDICES AND CITIGROUP INC."

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