The information in this preliminary pricing supplement is not complete and may be changed. This preliminary pricing supplement, 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.

The securities have complex features and investing in the securities involves risks not associated with an investment in conventional debt securities. See “Summary Risk Factors” beginning on page PS-7 and “Risk Factors” beginning on page PS-5 of the accompanying product supplement and beginning on page S-1 of the accompanying prospectus supplement.

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 or the accompanying product supplement, underlying supplement, prospectus supplement and prospectus are truthful or complete. Any representation to the contrary is a criminal offense.

The securities are unsecured debt obligations issued by Citigroup Global Markets Holdings Inc. and guaranteed by Citigroup Inc. All payments due on the securities are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc. None of Wells Fargo Securities, LLC (“Wells Fargo”) or any of its affiliates will have any liability to the purchasers of the securities in the event Citigroup Global Markets Holdings Inc. defaults on its obligations under the securities and Citigroup Inc. defaults on its guarantee obligations. 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.

(1) Citigroup Global Markets Holdings Inc. currently expects that the estimated value of the securities on the pricing date will be at least $910.00 per security, which will be less than the public offering price. The estimated value of the securities is based on Citigroup Global Markets Inc.’s (“CGMI”) 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 any 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, an affiliate of Citigroup Global Markets Holdings Inc., as the lead agent for the offering, expects to sell the securities to Wells Fargo, as agent. Wells Fargo will receive an underwriting discount and commission of up to 2.575% ($25.75) for each security it sells. Wells Fargo may pay selected dealers, which may include Wells Fargo Advisors (“WFA”) (the trade name of the retail brokerage business of its affiliates, Wells Fargo Clearing Services, LLC and Wells Fargo Advisors Financial Network, LLC), a fixed selling commission of 2.00% ($20.00) for each security they sell. In addition to the selling commission allowed to WFA, Wells Fargo may pay $0.75 per security of the underwriting discount and commission to WFA as a distribution expense fee for each security sold by WFA. The total underwriting discount and commission and proceeds to Citigroup Global Markets Holdings Inc. shown above give effect to the actual underwriting discount and commission provided for the sale of the securities. See “Supplemental Plan of Distribution” below and “Use of Proceeds and Hedging” in the accompanying prospectus for further information regarding how we have hedged our obligations under the securities.

(3) In respect of certain securities sold in this offering, CGMI may pay a fee of up to $4.00 per security to selected securities dealers in consideration for marketing and other services in connection with the distribution of the securities to other securities dealers.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

* Expected. To the extent that the issuer makes any change to the expected pricing date or expected issue date, the call dates (including the final calculation day) and maturity date may also be changed in the issuer’s discretion to ensure that the term of the securities remains the same.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

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, underlying 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 the underlying will be determined and other specified events with respect to the underlying. The accompanying underlying supplement contains information about the 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.

When we refer to “we,” “us” and “our” in this pricing supplement, we refer only to Citigroup Global Markets Holdings Inc. and not to any of its affiliates, including Citigroup Inc.

You may access the product supplement, underlying supplement and prospectus supplement and prospectus on the SEC website www.sec.gov as follows (or if such address has changed, by reviewing our filings for the relevant date on the SEC website):

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

The securities are not appropriate for all investors. The securities may be an appropriate investment for investors who:

The considerations identified above are not exhaustive. Whether or not the securities are an appropriate investment for you will depend on your individual circumstances, and you should reach an investment decision only after you and your investment, legal, tax, accounting and other advisors have carefully considered the appropriateness of an investment in the securities in light of your particular circumstances. You should also review carefully the “Summary Risk Factors” herein and the “Risk Factors” in the accompanying product supplement for risks related to an investment in the securities. For more information about the underlying, please see the information provided below.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

Whether the securities are automatically called for redemption on any call date (including the final calculation day) will be determined based on the closing value of the underlying on the applicable call date as follows:

If the securities are not automatically called for redemption prior to or at maturity, on the maturity date, you will receive a cash payment per security (the maturity payment amount) calculated as follows:.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

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 the underlying. Accordingly, the securities are appropriate 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 appropriateness 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” beginning on page PS-5 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.

Citigroup Inc. will release quarterly earnings on July 12, 2024, which is after the pricing date but on the issue date of these securities.

Unlike conventional debt securities, the securities do not repay a fixed amount of principal at maturity. Instead, if the securities are not automatically called for redemption prior to or at maturity, your maturity payment amount will depend on the performance of the underlying. If the securities are not automatically called for redemption prior to or at maturity, and the ending value is less than the threshold value, you will lose 1% of the stated principal amount of the securities for every 1% by which the underlying has declined from the starting value. There is no minimum maturity payment amount on the securities, and you may lose up to all of your investment.

Unlike conventional debt securities, the securities do not pay interest. You should not invest in the securities if you seek current income during the term of the securities.

Your potential return on the securities is limited to the applicable call premium payable upon automatic call. If the closing value of the underlying on one of the call dates is greater than or equal to the starting value, you will be repaid the stated principal amount of your securities and will receive the fixed call premium applicable to that call date, regardless of how significantly the closing value of the underlying on that call date may exceed the starting value. Accordingly, any call premium may result in a return on the securities that is significantly less than the return you could have achieved on a direct investment in the underlying.

The securities offer the potential to receive a call premium that reflects a per annum rate that would produce a yield that is generally higher than the yield on our conventional debt securities of the same maturity. This higher potential yield is associated with greater levels of expected risk as of the pricing date for the securities, including the risk that the securities will not be automatically called for redemption and the value of what you receive at maturity may be less than the stated principal amount of your securities and may be zero. The volatility of the underlying is an important factor affecting these risks. Greater expected volatility of the underlying as of the pricing date may result in a higher call premium, but would also represent a greater expected likelihood as of the pricing date that (i) the closing value of the underlying on one or more call dates will be less than the starting value, such that you will not receive any call premium, and (ii) the securities will not be automatically called for redemption and the ending value will be less than the threshold value, such that you will not be repaid the stated principal amount of your securities at maturity.

The Securities May Be Automatically Called For Redemption Prior To Maturity, Limiting The Term Of The Securities.

If the closing value of the underlying on any call date is greater than or equal to the starting value, the securities will be automatically called for redemption. If the securities are automatically called for redemption following any call date, they will cease to be outstanding and you will not receive the call premium applicable to any later call date. Moreover, you may not be able to reinvest your funds in another investment that provides a similar yield with a similar level of risk.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

The Securities Offer Downside Exposure To The Underlying, But No Upside Exposure To The Underlying.

You will not participate in any appreciation in the value of the underlying over the term of the securities. Consequently, your return on the securities will be limited to the applicable call premium payable upon an automatic call and may be significantly less than the return on the underlying over the term of the securities.

You Will Not Receive Dividends Or Have Any Other Rights With Respect To The Securities Included In The Underlying.

You will not receive any dividends with respect to the securities included in the underlying. 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 securities included in the underlying.

The Performance Of The Securities Will Depend On The Closing Values Of The Underlying Solely On The Call Dates, Which Makes The Securities Particularly Sensitive To Volatility In The Closing Values Of The Underlying On Or Near The Call Dates.

Whether the securities will be automatically called for redemption will depend on the closing values of the underlying solely on the call dates, regardless of the closing value of the underlying on other days during the term of the securities. If the securities are not automatically called for redemption, what you receive at maturity will depend solely on the closing value of the underlying on the final calculation day, and not on any other day during the term of the securities. Because the performance of the securities depends on the closing values of the underlying on a limited number of dates, the securities will be particularly sensitive to volatility in the closing values of the underlying. You should understand that the closing value of the underlying has historically been highly volatile.

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. We have been advised that Wells Fargo currently intends to make a secondary market in relation to the securities. However, Wells Fargo may suspend or terminate making a market without notice, at any time and for any reason. If Wells Fargo suspends or terminates making a market, there may be no secondary market at all for the securities because it is likely that Wells Fargo 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.

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 Public Offering Price.

The difference is attributable to certain costs associated with selling, structuring and hedging the securities that are included in the public offering 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 and/or Wells Fargo or its 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 Wells Fargo’s Determination Of The Secondary Market Rate With Respect To Us” 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 the underlying, the dividend yields on the securities included in the underlying 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.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

The Estimated Value Of The Securities Would Be Lower If It Were Calculated Based On Wells Fargo’s Determination Of The Secondary Market Rate With Respect To Us.

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. We expect that our internal funding rate is generally lower than Wells Fargo’s determination of the secondary market rate with respect to us, which is the rate that we expect Wells Fargo 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 Wells Fargo’s determination of the secondary market rate with respect to us, 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, Wells Fargo may determine the secondary market rate with respect to us for purposes of any purchase of the securities from you in the secondary market 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 Wells Fargo may deem appropriate.

The Estimated Value Of The Securities Is Not An Indication Of The Price, If Any, At Which Any 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, we expect that any value of the securities determined for purposes of a secondary market transaction will be based on Wells Fargo’s determination of the secondary market rate with respect to us, which will likely result in a lower value for the securities than if our internal funding rate were used. In addition, we expect that 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 may be reduced by 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 public offering 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 value of the underlying, the volatility of the closing value of the underlying, dividend yields on the securities included in the underlying, 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—General 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 value of the underlying 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 public offering price.

We Have Been Advised That, Immediately Following Issuance, Any Secondary Market Bid Price Provided By Wells Fargo, And The Value That Will Be Indicated On Any Brokerage Account Statements Prepared By Wells Fargo 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.

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

The Closing Value Of The Underlying May Be Adversely Affected By Our Or Our Affiliates’, Or By Wells Fargo And Its Affiliates’, Hedging And Other Trading Activities.

We expect to hedge our obligations under the securities through CGMI or other of our affiliates and/or Wells Fargo or its affiliates, who may take positions in the underlying or in financial instruments related to the underlying and may adjust such positions during the term

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

of the securities. Our affiliates and Wells Fargo and its affiliates may also take positions in the underlying or in financial instruments related to the underlying 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 value of the underlying 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 or Wells Fargo and its affiliates while the value of the securities declines.

We And Our Affiliates And Wells Fargo And Its Affiliates May Have Economic Interests That Are Adverse To Yours As A Result Of Our And Their Respective Business Activities.

Our affiliates and Wells Fargo and its 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 underlying 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 or Wells Fargo or its affiliates while the value of the securities declines. In addition, in the course of this business, we or our affiliates or Wells Fargo or its 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 the 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—General 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.

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

A Call Settlement Date Or The Stated Maturity Date May Be Postponed If A Call Date is Postponed.

A call date (including the final calculation day) will be postponed for non-trading days and certain market disruption events. If such a postponement occurs, the related call settlement date or maturity date, as applicable, will be postponed. For more information regarding adjustments to the calculation days and payment dates and the circumstances that may result in a market disruption event, see the relevant sections of the accompanying product supplement.

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. 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 “General Risk Factors Relating to All 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.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

The payout profile, return table and examples below illustrate how to determine the payment on the securities, assuming the various hypothetical closing 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 on the securities will be. The actual payment on the securities will depend on the actual closing values of the underlying on the call dates.

The examples below are based on the following hypothetical values and do not reflect the actual starting value or threshold value. For the actual starting value and threshold value, see “Terms of the Securities” above. 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 on the securities will be calculated based on the actual starting value and threshold value, and not the hypothetical values indicated below. The examples below assume that the call premiums will be set at the lowest values indicated in “Terms of the Securities” above. The actual call premiums will be determined on the pricing date.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

Example 1—Automatic Call Prior to Maturity. In this scenario, the hypothetical closing value of the underlying on the first call date is 150.00, which is greater than the starting value.

Because the closing value of the underlying on the first call date is greater than the starting value, the securities would be automatically called for redemption on the related call settlement date for an amount in cash per security equal to $1,000 plus the call premium of 8.00% of the stated principal amount. In this example, the total payment upon automatic call would be $1,080.00 per security.

Even though the underlying appreciated by a percentage greater than the call premium from the starting value to the closing value on the first call date in this example, your return is limited to the applicable call premium. In this scenario, an investment in the securities would underperform a hypothetical alternative investment providing 1-to-1 exposure to the appreciation of the underlying. If the securities are automatically called for redemption prior to maturity, they will cease to be outstanding on the related call settlement date, you will have no further rights under the securities after the related call settlement date and you will not receive the call premium applicable to any later call date.

Example 2—Automatic Call at Maturity. The securities are not automatically called prior to maturity. In this scenario, the hypothetical closing value of the underlying on the final calculation day is 125.00, which is greater than the starting value.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

Because the closing value of the underlying on each call date prior to the last call date (which is the final calculation day) is less than the starting value, the securities are not automatically called prior to maturity. Because the closing value of the underlying on the final calculation day is greater than the starting value, the securities would be automatically called for redemption on the related call settlement date (which is the maturity date) for an amount in cash per security equal to $1,000 plus the call premium of 32.00% of the stated principal amount. In this example, the total payment upon automatic call would be $1,320.00 per security.

Example 3—Par Scenario. In this scenario, the hypothetical ending value is 95.00, which is less than the starting value but greater than the threshold value.

Because the ending value of the underlying on the final calculation day is less than the starting value but greater than the threshold value, you would be repaid the stated principal amount of your securities at maturity but would not receive any positive return on your investment.

Example 4—Downside Scenario. In this scenario, the hypothetical ending value is 50.00, which is less than the threshold value.

Because the ending value is less than the threshold value, your maturity payment amount in this scenario would reflect 1-to-1 exposure to the negative performance of the underlying.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

The Nasdaq-100 Index^® is a modified market capitalization-weighted index of stocks of the 100 largest non-financial companies listed on the Nasdaq Stock Market. All stocks included in the Nasdaq-100 Index^® are traded on a major U.S. exchange. The Nasdaq-100 Index^® was developed by the Nasdaq Stock Market, Inc. and is calculated, maintained and published by Nasdaq, Inc.

Please refer to the section “Equity Index Descriptions—The Nasdaq-100 Index^®” in the accompanying underlying supplement for additional information.

We have derived all information regarding the Nasdaq-100 Index^® from publicly available information and have not independently verified any information regarding the Nasdaq-100 Index^®. This pricing supplement relates only to the securities and not to the Nasdaq-100 Index^®. We make no representation as to the performance of the Nasdaq-100 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 Nasdaq-100 Index^® is not involved in any way in this offering and has no obligation relating to the securities or to holders of the securities.

The graph below shows the closing value of the Nasdaq-100 Index^®for each day such value was available from January 2, 2019 to June 18, 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.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

In the opinion of our counsel, Davis Polk & Wardwell LLP, a security should be treated as a prepaid forward contract for U.S. federal income tax purposes. By purchasing a security, you agree (in the absence of an administrative determination or judicial ruling to the contrary) to this treatment. There is uncertainty regarding this treatment, and the IRS or a court might not agree with it. 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:

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 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, 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 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.

Market Linked Securities—Auto-Callable with Contingent Downside

Principal at Risk Securities Linked to the Nasdaq-100 Index^® due July 13, 2028

Pursuant to the terms of the Amended and Restated Global Selling Agency Agreement, dated April 7, 2017, CGMI, acting as principal, will purchase the securities from Citigroup Global Markets Holdings Inc. CGMI, as the lead agent for the offering, expects to sell the securities to Wells Fargo, as agent. Wells Fargo will receive an underwriting discount and commission of up to 2.575% ($25.75) for each security it sells. Wells Fargo may pay selected dealers, which may include WFA, a fixed selling commission of 2.00% ($20.00) for each security they sell. In addition to the selling commission allowed to WFA, Wells Fargo may pay $0.75 per security of the underwriting discount and commission to WFA as a distribution expense fee for each security sold by WFA.

In addition, in respect of certain securities sold in this offering, CGMI may pay a fee of up to $4.00 per security to selected securities dealers in consideration for marketing and other services in connection with the distribution of the securities to other securities dealers.

For the avoidance of doubt, the fees and selling concessions described in this pricing supplement will not be rebated if the securities are automatically redeemed prior to maturity.

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 certain terms of the securities have not yet been fixed and because it is uncertain what the values of the inputs to CGMI’s proprietary pricing models will be on the pricing date.

We have been advised that, for a period of approximately four months following issuance of the securities, the price, if any, at which Wells Fargo 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 Wells Fargo or its affiliates, 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 costs associated with selling, structuring and hedging the securities that are included in the public offering price of the securities. The amount of this temporary upward adjustment will decline to zero on a straight-line basis over the four-month temporary adjustment period. However, Wells Fargo 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.”

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	Per Security	Total
Public Offering Price⁽¹⁾	$1,000.00	$
Maximum Underwriting Discount and Commission⁽²⁾⁽³⁾	$25.75	$
Proceeds to Citigroup Global Markets Holdings Inc.⁽²⁾	$974.25	$

Underlying:	The Nasdaq-100 Index^®
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.
Stated Principal Amount:	$1,000 per security. References in this pricing supplement to a “security” are to a security with a stated principal amount of $1,000.
Pricing Date*:	July 9, 2024
Issue Date*:	July 12, 2024
Maturity Date*:	July 13, 2028, subject to postponement as described in the accompanying product supplement.
Automatic Call:	If the closing value of the underlying on any call date (including the final calculation day) is greater than or equal to the starting value, the securities will be automatically called for redemption on the related call settlement date for an amount in cash per security equal to $1,000 plus the call premium applicable to that call date. Any positive return on the securities will be limited to the applicable call premium, even if the closing value of the underlying on the applicable call date significantly exceeds the starting value. You will not participate in any appreciation of the underlying beyond the applicable call premium. If the securities are automatically called for redemption, they will cease to be outstanding on the related call settlement date and you will have no further rights under the securities after such call settlement date. You will not receive any notice from us if the securities are automatically called.
	The call premium applicable to each call date will be determined on the pricing date and will be at least the value indicated below.

	Call Date	Call Premium
*Call Dates and Call Premiums:**	July 14, 2025	8.00% of the stated principal amount
	October 14, 2025	10.00% of the stated principal amount
	January 12, 2026	12.00% of the stated principal amount
	April 13, 2026	14.00% of the stated principal amount
	July 13, 2026	16.00% of the stated principal amount
	October 13, 2026	18.00% of the stated principal amount
	January 12, 2027	20.00% of the stated principal amount
	April 12, 2027	22.00% of the stated principal amount
	July 12, 2027	24.00% of the stated principal amount
	October 12, 2027	26.00% of the stated principal amount
	January 12, 2028	28.00% of the stated principal amount
	April 12, 2028	30.00% of the stated principal amount
	July 10, 2028 (the “final calculation day”)	32.00% of the stated principal amount

Maturity Payment Amount:	If the securities are not automatically called for redemption prior to or at maturity, and, accordingly, the ending value is less than the starting value, you will receive a maturity payment amount for each $1,000 stated principal amount security you hold at maturity: • If the ending value is greater than or equal to the threshold value: $1,000; or • If the ending value is less than the threshold value: $1,000 × the performance factor of the underlying If the securities are not automatically called for redemption prior to or at maturity, and the ending value is less than the threshold value, you will receive significantly less than the stated principal amount of your securities, and possibly nothing, at maturity.
Starting Value:	The closing value of the underlying on the pricing date
Threshold Value:	, which is equal to 75% of the starting value.
Ending Value:	The closing value of the underlying on the final calculation day
Performance Factor:	The ending value divided by the starting value
Calculation Agent:	CGMI
Denominations:	$1,000 and any integral multiple of $1,000
CUSIP / ISIN:	17331U2K2 / US17331U2K29

Hypothetical starting value	100.00
Hypothetical threshold value	75.00 (75% of the hypothetical starting value)

Hypothetical call date on which securities re automatically called	Hypothetical payment per security on related call settlement date	Hypothetical total pre-tax rate of return
1^st call date	$1,080.00	8.00%
2^nd call date	$1,100.00	10.00%
3^rd call date	$1,120.00	12.00%
4^th call date	$1,140.00	14.00%
5^th call date	$1,160.00	16.00%
6^th call date	$1,180.00	18.00%
7^th call date	$1,200.00	20.00%
8^th call date	$1,220.00	22.00%
9^th call date	$1,240.00	24.00%
10^th call date	$1,260.00	26.00%
11^th call date	$1,280.00	28.00%
12^th call date	$1,300.00	30.00%
13^th call date	$1,320.00	32.00%

Hypothetical ending value	Hypothetical performance factor	Hypothetical maturity payment amount per security	Hypothetical total pre-tax rate of return
99.00	99.00%	$1,000.00	0.00%
90.00	90.00%	$1,000.00	0.00%
80.00	80.00%	$1,000.00	0.00%
75.00	75.00%	$1,000.00	0.00%
74.99	74.99%	$749.90	-25.01%
50.00	50.00%	$500.00	-50.00%
25.00	25.00%	$250.00	-75.00%
0.00	0.00%	$0.00	-100.00%