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, 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 JULY 29, 2025

Citigroup Global Markets Holdings Inc. August     , 2025 Medium-Term Senior Notes, Series N Pricing Supplement No. 2025-USNCH27771 Filed Pursuant to Rule 424(b)(2) Registration Statement Nos. 333-270327 and 333-270327-01

Autocallable Market-Linked Securities Linked to the Worst Performing of Amazon.com, Inc., Apple Inc., NVIDIA Corporation, Palantir Technologies Inc. and Tesla, Inc. Due August 4, 2028

▪ 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 the terms described below if the closing value of  the underlyings on the valuation date prior to the final valuation date exceeds the applicable initial underlying value. 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 return at maturity based on the performance of the worst performing of the underlyings from its initial underlying value to its final underlying value.

▪ If on the valuation date prior to the final valuation date, the closing value of the worst performing underlying is greater than or equal to the applicable initial underlying value, the securities will be automatically redeemed. If the securities are not automatically redeemed prior to maturity and the worst performing underlying appreciates from its initial underlying value to its final underlying value, 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 worst performing underlying 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 worst performing underlying. Even if the worst performing underlying appreciates from its initial underlying value to its final underlying value, 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.

▪ 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.

▪ 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*
	Amazon.com, Inc.	$
	Apple Inc.	$
	NVIDIA Corporation	$
	Palantir Technologies Inc.	$
	Tesla, Inc.	$

	*For each underlying, its closing value on the pricing date
Stated principal amount:	$1,000 per security
Pricing date:	August 1, 2025
Issue date:	August 6, 2025
Valuation dates:	August 3, 2026 and August 1, 2028 (the “final valuation date”), each subject to postponement if such date is not a scheduled trading day or certain market disruption events occur
Maturity date:	Unless earlier redeemed, August 4, 2028
Automatic early redemption:	If, on the valuation date prior to the final valuation date, the closing value of the worst performing underlying on that valuation date is greater than or equal to its initial underlying value, 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 the valuation date prior to the final valuation date, they will cease to be outstanding and you will not have the opportunity to participate in any appreciation of any underlying.
Premium:	The premium applicable to the valuation date prior to the final valuation date is the percentage of the stated principal amount indicated below. The premium may be significantly less than the appreciation of any underlying from the pricing date to the valuation date prior to the final valuation date. • August 3, 2026: 16.00%      of the stated principal amount
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 underlying value of the worst performing underlying on the final valuation date is greater than its initial underlying value: $1,000 × the underlying return of the worst performing underlying × the upside participation rate If the final underlying value of the worst performing underlying on the final valuation date is less than or equal to its initial underlying value: $0
Final underlying value:	For each underlying, its closing value on the final valuation date
Upside participation rate:	160.00%
Worst performing underlying:	The underlying with the lowest underlying return
Underlying return:	For each underlying, (i) its final underlying value minus its initial underlying value, divided by (ii) its initial underlying value
Listing:	The securities will not be listed on any securities exchange
CUSIP / ISIN:	17333LTU9 / US17333LTU97
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
Per security:	$1,000.00	—	$1,000.00
Total:	$	—	$

(1) Citigroup Global Markets Holdings Inc. currently expects that the estimated value of the securities on the pricing date will be at least $938.50 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 pay selected dealers a structuring fee of up to $5.00 for each security sold in this offering. We may also engage other firms to provide marketing or promotional services in connection with the distribution of the securities. CGMI will pay these service providers a fee of up to $4.50 per security in consideration for providing marketing, education, structuring or referral services with respect to financial advisors or selected dealers. For more information on the distribution of the securities, see “Supplemental Plan of Distribution” in this pricing supplement. 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.

Investing in the securities involves risks not associated with an investment in conventional debt securities. See “Summary Risk Factors” beginning on page PS-5.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the securities or determined that this pricing supplement and the accompanying product 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, prospectus supplement and prospectus, which can be accessed via the hyperlinks below:

Product Supplement No. EA-03-09 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.

Citigroup Global Markets Holdings Inc.

Additional Information

General. 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. It is important that you read the accompanying product supplement, prospectus supplement and prospectus together with this pricing supplement before deciding whether to invest in the securities. Certain terms used but not defined in this pricing supplement are defined in the accompanying product supplement.

Closing Value. The “closing value” of each underlying on any date is the closing price of its underlying shares on such date, as provided in the accompanying product supplement. The “underlying shares” of (i) Amazon.com, Inc., Apple Inc., NVIDIA Corporation and Tesla, Inc. are their respective shares of common stock and (ii) Palantir Technologies Inc. are its shares of Class A common stock. Please see the accompanying product supplement for more information.

PS-2

Citigroup Global Markets Holdings Inc.

Hypothetical Payment Upon Automatic Early Redemption

The following table illustrates how the amount payable per security upon automatic early redemption will be calculated if the closing value of the worst performing underlying on the valuation date prior to the final valuation date is greater than or equal to its initial underlying value.

If the closing value of the worst performing underlying on the valuation date below is greater than or equal to its initial underlying value...	...then you will receive the following payment per security upon automatic early redemption:
August 3, 2026	$1,000.00 + applicable premium = $1,000.00 + $160.00 = $1,160.00

If, on the valuation date prior to the final valuation date, the closing value of any underlying is greater than or equal to its initial underlying value, but the closing value of any other underlying is less than its initial underlying value, you will not receive the premium indicated above following that valuation date. In order to receive the premium indicated above, the closing value of each underlying on the applicable valuation date must be greater than or equal to its initial underlying value.

Payment at Maturity Diagram

The diagram below illustrates your payment at maturity of the securities, assuming the securities have not previously been automatically redeemed, for a range of hypothetical underlying returns of the worst performing underlying. Your payment at maturity (if the securities are not earlier automatically redeemed) will be determined based solely on the performance of the worst performing underlying on the final valuation date.

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.

Payment at Maturity Diagram
n The Securities	n The Worst Performing Underlying

PS-3

Citigroup Global Markets Holdings Inc.

Hypothetical Examples of the Payment at Maturity

The examples below are intended to illustrate how, if the securities are not automatically redeemed prior to maturity, your payment at maturity will depend on the final underlying value of the worst performing underlying on the final valuation date. Your actual payment at maturity per security, if the securities are not automatically redeemed prior to maturity, will depend on the actual final underlying value of the worst performing underlying on the final valuation date. 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 of the underlyings. For the actual initial underlying 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 of each underlying, and not the hypothetical values indicated below. For ease of analysis, figures below have been rounded.

Underlying	Hypothetical initial underlying value
Amazon.com, Inc.	$100.00
Apple Inc.	$100.00
NVIDIA Corporation	$100.00
Palantir Technologies Inc.	$100.00
Tesla, Inc.	$100.00

Example 1—Upside Scenario. The final underlying value of the worst performing underlying is $105.00, resulting in a 5.00% 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
Amazon.com, Inc.*	$105.00	5.00%
Apple Inc.	$140.00	40.00%
NVIDIA Corporation	$140.00	40.00%
Palantir Technologies Inc.	$150.00	50.00%
Tesla, Inc.	$130.00	30.00%

* Worst performing underlying

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

= $1,000 + ($1,000 × the underlying return of the worst performing underlying × the upside participation rate)

= $1,000 + ($1,000 × 5.00% × 160.00%)

= $1,000 + $80.00

= $1,080.00

In this scenario, the worst performing underlying has appreciated from its initial underlying value to its final underlying value, and your total return at maturity would equal the underlying return of the worst performing underlying multiplied by the upside participation rate.

Example 2—Par Scenario. The final underlying value of the worst performing underlying is $95.00, resulting in a -5.00% 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.

Underlying	Hypothetical final underlying value	Hypothetical underlying return
Amazon.com, Inc.	$120.00	20.00%
Apple Inc.*	$95.00	-5.00%
NVIDIA Corporation	$110.00	10.00%
Palantir Technologies Inc.	$110.00	10.00%
Tesla, Inc.	$110.00	10.00%

* Worst performing underlying

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

= $1,000 + $0

= $1,000.00

In this scenario, the worst performing underlying has depreciated from its initial underlying value to its final underlying value. As a result, the payment at maturity per security would equal the $1,000 stated principal amount per security and you would not receive any positive return on your investment.

PS-4

Citigroup Global Markets Holdings Inc.

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 Notes” beginning on page EA-6 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.

§ You may not receive any return on your investment in the securities. If the closing value of the underlyings is not greater than or equal to the applicable initial underlying value on the 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 worst performing underlying appreciates from its initial underlying value to its final underlying value. If the final underlying value of the worst performing underlying is less than or equal to its initial underlying value, 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 worst performing underlying appreciates from its initial underlying value to its final underlying value, 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.

§ 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 value of the worst performing underlying may exceed the applicable initial underlying value.

§ The term of the securities may be as short as one year. If the closing value of the worst performing underlying on the valuation date prior to the final valuation date is greater than or equal to the applicable initial underlying value, the securities will be automatically redeemed. If the securities are automatically redeemed following the valuation date prior to the final valuation date, they will cease to be outstanding and you will no longer have the opportunity to participate in any appreciation of the underlying on the final valuation date at the upside participation rate. Moreover, you may not be able to reinvest your funds in another investment that provides a similar yield with a similar level of risk.

§ 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 worst performing underlying declines or does not appreciate from its initial underlying value to its final underlying value. 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.

§ 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.

§ 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.

§ 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.

§ 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.

§ 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.

PS-5

Citigroup Global Markets Holdings Inc.

§ 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. If any change to the underlying shares is proposed, such as an amendment to the underlying’s organizational documents, you will not have the right to vote on such change. Any such change may adversely affect the market value of the underlyings.

§ Your return on the securities depends on the closing value of the worst performing underlying on only the valuation dates. Because your payment upon automatic early redemption, if applicable, or at maturity depends on the closing value of the worst performing underlying solely on the applicable 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 return on the securities was based on an average of closing values of the worst performing underlying, you might have achieved better returns.

§ 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.

§ 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.

§ 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.

§ 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.

§ 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.

§ 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.

PS-6

Citigroup Global Markets Holdings Inc.

§ 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.

§ 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 Notes—Risk Factors Relating to All Notes—The value of your notes 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.

§ 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.

§ 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.

§ 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.

§ 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.

§ 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 Notes—Risk Factors Relating to All Notes—The calculation agent, which is an affiliate of ours, will make important determinations with respect to the notes” in the accompanying product supplement.

§ Even if an underlying pays a dividend that it identifies as special or extraordinary, no adjustment will be required under the securities for that dividend unless it meets the criteria specified in the accompanying product supplement. In general, an adjustment will not be made under the terms of the securities for any cash dividend paid by an underlying unless the amount of the dividend per share, together with any other dividends paid in the same quarter, exceeds the dividend paid per share in the most recent quarter by an amount equal to at least 10% of the closing value of that underlying on the date of declaration of the dividend. Any dividend will reduce the closing value of the underlying by the amount of the dividend per share. If an underlying pays any dividend for which an adjustment is not made under the terms of the securities, holders of the securities will be adversely affected. See “Description of the Securities—Certain Additional Terms for Securities Linked to an Underlying Company or an Underlying ETF—Dilution and Reorganization Adjustments—Certain Extraordinary Cash Dividends” in the accompanying product supplement.

§ The securities will not be adjusted for all events that may have a dilutive effect on or otherwise adversely affect the closing value of an underlying. For example, we will not make any adjustment for ordinary dividends or extraordinary dividends that do not meet the criteria described above, partial tender offers or additional underlying share issuances. Moreover, the adjustments we do make may not fully offset the dilutive or adverse effect of the particular event. Investors in the securities may be adversely affected by such an event in a circumstance in which a direct holder of the underlying shares of an underlying would not.

PS-7

Citigroup Global Markets Holdings Inc.

§ The securities may become linked to an underlying other than an original underlying upon the occurrence of a reorganization event or upon the delisting of the underlying shares of that original underlying. For example, if an underlying enters into a merger agreement that provides for holders of its underlying shares to receive shares of another entity and such shares are marketable securities, the closing value of that underlying following consummation of the merger will be based on the value of such other shares. Additionally, if the underlying shares of an underlying are delisted, the calculation agent may select a successor underlying. See “Description of the Securities—Certain Additional Terms for Securities Linked to an Underlying Company or an Underlying ETF” in the accompanying product supplement.

§ If the underlying shares of an underlying are delisted, we may call the securities prior to maturity for an amount that may be less than the stated principal amount. If we exercise this call right, you will receive the amount described under “Description of the Securities—Certain Additional Terms for Securities Linked to an Underlying Company or an Underlying ETF—Delisting of an Underlying Company” in the accompanying product supplement. This amount may be less, and possibly significantly less, than the stated principal amount of the securities.

PS-8

Citigroup Global Markets Holdings Inc.

Information About Amazon.com, Inc.

Amazon.com, Inc. is an online retailer that offers a wide range of products. The company’s products include books, music, computers, electronics and numerous other products. Amazon.com, Inc. offers personalized shopping services, Web-based credit card payment, and direct shipping to customers. Amazon.com, Inc. also operates a cloud platform offering services globally. The underlying shares of Amazon.com, Inc. are registered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Information provided to or filed with the SEC by Amazon.com, Inc. pursuant to the Exchange Act can be located by reference to the SEC file number 000-22513 through the SEC’s website at http://www.sec.gov. In addition, information regarding Amazon.com, Inc. may be obtained from other sources including, but not limited to, press releases, newspaper articles and other publicly disseminated documents. The underlying shares of Amazon.com, Inc. trade on the NASDAQ Global Select Market under the ticker symbol “AMZN.”

We have derived all information regarding Amazon.com, Inc. from publicly available information and have not independently verified any information regarding Amazon.com, Inc. This pricing supplement relates only to the securities and not to Amazon.com, Inc. We make no representation as to the performance of Amazon.com, Inc. over the term of the securities.

The securities represent obligations of Citigroup Global Markets Holdings Inc. (guaranteed by Citigroup Inc.) only. Amazon.com, Inc. 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 Amazon.com, Inc. on July 25, 2025 was $231.44.

The graph below shows the closing value of Amazon.com, Inc. for each day such value was available from January 2, 2015 to July 25, 2025. We obtained the closing values from Bloomberg L.P., without independent verification. If certain corporate transactions occurred during the historical period shown below, including, but not limited to, spin-offs or mergers, then the closing values shown below for the period prior to the occurrence of any such transaction have been adjusted by Bloomberg L.P. as if any such transaction had occurred prior to the first day in the period shown below. You should not take historical closing values as an indication of future performance.

Amazon.com, Inc. – Historical Closing ValuesJanuary 2, 2015 to July 25, 2025

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Citigroup Global Markets Holdings Inc.

Information About Apple Inc.

Apple Inc. designs, manufactures, and markets personal computers and related personal computing and mobile communication devices along with a variety of related software, services, peripherals, and networking solutions. Apple Inc. sells its products worldwide through its online stores, its retail stores, its direct sales force, third-party wholesalers, and resellers. The underlying shares of Apple Inc. are registered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Information provided to or filed with the SEC by Apple Inc. pursuant to the Exchange Act can be located by reference to the SEC file number 001-36743 through the SEC’s website at http://www.sec.gov. In addition, information regarding Apple Inc. may be obtained from other sources including, but not limited to, press releases, newspaper articles and other publicly disseminated documents. The underlying shares of Apple Inc. trade on the NASDAQ Global Select Market under the ticker symbol “AAPL.”

We have derived all information regarding Apple Inc. from publicly available information and have not independently verified any information regarding Apple Inc. This pricing supplement relates only to the securities and not to Apple Inc. We make no representation as to the performance of Apple Inc. over the term of the securities.

The securities represent obligations of Citigroup Global Markets Holdings Inc. (guaranteed by Citigroup Inc.) only. Apple Inc. 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 Apple Inc. on July 25, 2025 was $213.88.

The graph below shows the closing value of Apple Inc. for each day such value was available from January 2, 2015 to July 25, 2025. We obtained the closing values from Bloomberg L.P., without independent verification. If certain corporate transactions occurred during the historical period shown below, including, but not limited to, spin-offs or mergers, then the closing values shown below for the period prior to the occurrence of any such transaction have been adjusted by Bloomberg L.P. as if any such transaction had occurred prior to the first day in the period shown below. You should not take historical closing values as an indication of future performance.

Apple Inc. – Historical Closing ValuesJanuary 2, 2015 to July 25, 2025

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Citigroup Global Markets Holdings Inc.

Information About NVIDIA Corporation

NVIDIA Corporation designs, develops, and markets three-dimensional (3D) graphics processors and related software. The company offers products that provide interactive 3D graphics to the mainstream personal computer market. The underlying shares of NVIDIA Corporation are registered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Information provided to or filed with the SEC by NVIDIA Corporation pursuant to the Exchange Act can be located by reference to the SEC file number 000-23985 through the SEC’s website at http://www.sec.gov. In addition, information regarding NVIDIA Corporation may be obtained from other sources including, but not limited to, press releases, newspaper articles and other publicly disseminated documents. The underlying shares of NVIDIA Corporation trade on the NASDAQ Global Select Market under the ticker symbol “NVDA.”

We have derived all information regarding NVIDIA Corporation from publicly available information and have not independently verified any information regarding NVIDIA Corporation. This pricing supplement relates only to the securities and not to NVIDIA Corporation. We make no representation as to the performance of NVIDIA Corporation over the term of the securities.

The securities represent obligations of Citigroup Global Markets Holdings Inc. (guaranteed by Citigroup Inc.) only. NVIDIA Corporation 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 NVIDIA Corporation on July 25, 2025 was $173.50.

The graph below shows the closing value of NVIDIA Corporation for each day such value was available from January 2, 2015 to July 25, 2025. We obtained the closing values from Bloomberg L.P., without independent verification. If certain corporate transactions occurred during the historical period shown below, including, but not limited to, spin-offs or mergers, then the closing values shown below for the period prior to the occurrence of any such transaction have been adjusted by Bloomberg L.P. as if any such transaction had occurred prior to the first day in the period shown below. You should not take historical closing values as an indication of future performance.

NVIDIA Corporation – Historical Closing ValuesJanuary 2, 2015 to July 25, 2025

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Citigroup Global Markets Holdings Inc.

Information About Palantir Technologies Inc.

Palantir Technologies Inc. builds software platforms for government and commercial organizations. The underlying shares of Palantir Technologies Inc. are registered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Information provided to or filed with the SEC by Palantir Technologies Inc. pursuant to the Exchange Act can be located by reference to the SEC file number 001-39540 through the SEC’s website at http://www.sec.gov. In addition, information regarding Palantir Technologies Inc. may be obtained from other sources including, but not limited to, press releases, newspaper articles and other publicly disseminated documents. The underlying shares of Palantir Technologies Inc. trade on the NASDAQ Global Select Market under the ticker symbol “PLTR.”

We have derived all information regarding Palantir Technologies Inc. from publicly available information and have not independently verified any information regarding Palantir Technologies Inc. This pricing supplement relates only to the securities and not to Palantir Technologies Inc. We make no representation as to the performance of Palantir Technologies Inc. over the term of the securities.

The securities represent obligations of Citigroup Global Markets Holdings Inc. (guaranteed by Citigroup Inc.) only. Palantir Technologies Inc. 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 Palantir Technologies Inc. on July 25, 2025 was $158.80.

The graph below shows the closing value of Palantir Technologies Inc. for each day such value was available from September 29, 2020 to July 25, 2025. We obtained the closing values from Bloomberg L.P., without independent verification. If certain corporate transactions occurred during the historical period shown below, including, but not limited to, spin-offs or mergers, then the closing values shown below for the period prior to the occurrence of any such transaction have been adjusted by Bloomberg L.P. as if any such transaction had occurred prior to the first day in the period shown below. You should not take historical closing values as an indication of future performance.

Palantir Technologies Inc. – Historical Closing ValuesSeptember 29, 2020 to July 25, 2025

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Citigroup Global Markets Holdings Inc.

Information About Tesla, Inc.

Tesla, Inc. designs, manufactures, and sells electric vehicles and energy generation and storage systems, and offers services related to its sustainable energy products. The underlying shares of Tesla, Inc. are registered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Information provided to or filed with the SEC by Tesla, Inc. pursuant to the Exchange Act can be located by reference to the SEC file number 001-34756 through the SEC’s website at http://www.sec.gov. In addition, information regarding Tesla, Inc. may be obtained from other sources including, but not limited to, press releases, newspaper articles and other publicly disseminated documents. The underlying shares of Tesla, Inc. trade on the NASDAQ Global Select Market under the ticker symbol “TSLA.”

We have derived all information regarding Tesla, Inc. from publicly available information and have not independently verified any information regarding Tesla, Inc. This pricing supplement relates only to the securities and not to Tesla, Inc. We make no representation as to the performance of Tesla, Inc. over the term of the securities.

The securities represent obligations of Citigroup Global Markets Holdings Inc. (guaranteed by Citigroup Inc.) only. Tesla, Inc. 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 Tesla, Inc. on July 25, 2025 was $316.06.

The graph below shows the closing value of Tesla, Inc. for each day such value was available from January 2, 2015 to July 25, 2025. We obtained the closing values from Bloomberg L.P., without independent verification. If certain corporate transactions occurred during the historical period shown below, including, but not limited to, spin-offs or mergers, then the closing values shown below for the period prior to the occurrence of any such transaction have been adjusted by Bloomberg L.P. as if any such transaction had occurred prior to the first day in the period shown below. You should not take historical closing values as an indication of future performance.

Tesla, Inc. – Historical Closing ValuesJanuary 2, 2015 to July 25, 2025

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Citigroup Global Markets Holdings Inc.

United States Federal Tax Considerations

In the opinion of our counsel, Davis Polk & Wardwell LLP, the securities will be treated as “contingent payment debt instruments” for U.S. federal income tax purposes, as described in the section of the accompanying product supplement called “United States Federal Tax Considerations—Tax Consequences to U.S. Holders—Notes Treated as Contingent Payment Debt Instruments,” and the remaining discussion is based on this treatment.

If you are a U.S. Holder (as defined in the accompanying product supplement), you will be required to recognize interest income during the term of the securities at the “comparable yield,” which generally is the yield at which we could issue a fixed-rate debt instrument with terms similar to those of the securities, including the level of subordination, term, timing of payments and general market conditions, but excluding any adjustments for the riskiness of the contingencies or the liquidity of the securities. Although it is not clear how the comparable yield should be determined for securities that may be automatically redeemed before maturity, our determination of the comparable yield is based on the maturity date. We are required to construct a “projected payment schedule” in respect of the securities representing a payment the amount and timing of which would produce a yield to maturity on the securities equal to the comparable yield. Assuming you hold the securities until their maturity, the amount of interest you include in income based on the comparable yield in the taxable year in which the securities mature will be adjusted upward or downward to reflect the difference, if any, between the actual and projected payment on the securities at maturity as determined under the projected payment schedule.

Upon the sale, exchange or retirement of the securities prior to maturity, you generally will recognize gain or loss equal to the difference between the proceeds received and your adjusted tax basis in the securities. Your adjusted tax basis will equal your purchase price for the securities, increased by interest previously included in income on the securities. Any gain generally will be treated as ordinary income, and any loss generally will be treated as ordinary loss to the extent of prior interest inclusions on the security and as capital loss thereafter.

We have determined that the comparable yield for a security is a rate of    %, compounded semi-annually, and that the projected payment schedule with respect to a security consists of a single payment of $    at maturity.

Neither the comparable yield nor the projected payment schedule constitutes a representation by us regarding the actual amount that we will pay on the securities.

Non-U.S. Holders. Subject to the discussions below regarding Section 871(m) and in “United States Federal Tax Considerations—Tax Consequences to Non-U.S. Holders” and “—FATCA” in the accompanying product supplement, if you are a Non-U.S. Holder (as defined in the accompanying product supplement) of the securities, under current law you generally will not be subject to U.S. federal withholding or income tax in respect of any payment on or any amount received on the sale, exchange or retirement of 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. See “United States Federal Tax Considerations—Tax Consequences to Non-U.S. Holders” in the accompanying product supplement for a more detailed discussion of the rules applicable to Non-U.S. Holders of the securities.

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 Internal Revenue Code of 1986, as amended, 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 (“Underlying Securities”) or indices that include Underlying Securities. Section 871(m) generally applies to instruments that substantially replicate the economic performance of one or more Underlying Securities, as determined based on tests set forth in the applicable Treasury regulations. However, the regulations, as modified by an Internal Revenue Service (“IRS”) notice, exempt financial instruments issued prior to January 1, 2027 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 Underlying Security 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 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 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 not receive any underwriting fee for any securities sold in this offering. However, CGMI and its affiliates may profit from expected hedging activity related to this offering. From these expected hedging profits, CGMI will pay selected dealers participating in the distribution of the securities a structuring fee of up to $5.00 for each security sold in this offering. We may also engage other firms to provide marketing or promotional services

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Citigroup Global Markets Holdings Inc.

in connection with the distribution of the securities. CGMI will pay these service providers a fee of up to $4.50 per security in consideration for providing marketing, education, structuring or referral services with respect to financial advisors or selected dealers. For the avoidance of doubt, any fees or selling concessions described in this pricing supplement will not be rebated if the securities are automatically redeemed prior to maturity.

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 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.”

Contact

Clients may contact their local brokerage representative. Third-party distributors may contact Citi Structured Investment Sales at (212) 723-7005.

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