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 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 MAY 26, 2021

Citigroup Global Markets Holdings Inc. May----, 2021 Medium-Term Senior Notes, Series N Pricing Supplement No. 2021-USNCH7785 Filed Pursuant to Rule 424(b)(2) Registration Statement Nos. 333-255302 and 333-255302-03

Fixed to Floating Rate Notes Due November 28, 2022

· The notes will pay interest at a fixed rate during an initial fixed rate period and, thereafter, will bear interest at a floating rate based on SOFR (compounded daily during the relevant interest period) plus the floating rate spread specified below, subject to a minimum interest rate of 0.00%. After the initial fixed rate period, interest payments on the notes will vary and may be paid at a rate as low as 0.00% per annum.

· The notes are unsecured debt securities issued by Citigroup Global Markets Holdings Inc. and guaranteed by Citigroup Inc. All payments on the notes are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc.

· It is important for you to consider the information contained in this pricing supplement together with the information contained in the accompanying prospectus supplement and prospectus. The description of the notes below supplements, and to the extent inconsistent with replaces, the description of the general terms of the notes set forth in the accompanying prospectus supplement and prospectus.

KEY TERMS
Issuer:	Citigroup Global Markets Holdings Inc., a wholly owned subsidiary of Citigroup Inc.
Guarantee:	All payments due on the notes are fully and unconditionally guaranteed by Citigroup Inc.
Stated principal amount:	$1,000 per note
Pricing date:	May 26, 2021
Original issue date:	May 28, 2021
Maturity date:	November 28, 2022.  If the maturity date is not a business day, then such date will be postponed to the next succeeding business day.
Principal due at maturity:	Full principal amount due at maturity
Payment at maturity:	$1,000 per note plus any accrued and unpaid interest
Initial fixed rate period:	The period from and including the issue date to but excluding November 28, 2021
Floating rate period:	The period from and including November 28, 2021 to but excluding the maturity date
Interest rate per annum:	·     For each interest period during the initial fixed rate period, the notes will bear interest at a fixed rate of 0.30% per annum ·     For each interest period during the floating rate period, the notes will bear interest at a floating rate per annum equal to SOFR (compounded daily over the relevant interest period as described under “Determination of SOFR” below) plus a spread of 0.28% (the “floating rate spread”), subject to a minimum interest rate of 0.00% per annum for any interest period
Interest period:	Each period from, and including, an interest period end date (or, in the case of the first interest period, the original issue date) to, but excluding, the next succeeding interest period end date; provided that SOFR for each calendar day from, and including, the rate cut-off date for each interest period during the floating rate period to, but excluding, the interest period end date for such interest period will equal SOFR in respect of the rate cut-off date.
Rate cut-off date:	For each interest period during the floating rate period, the second U.S. government securities business day immediately preceding the interest period end date for such interest period.
Interest payment dates:	For each interest period, the interest payment date is the interest period end date that immediately follows the end of such interest period.
Interest period end date:	The 28th of each February, May, August and November, commencing on August 28, 2021 and ending on the maturity date. In the event that any interest period end date is not a business day, then such date will be postponed to the next succeeding business day.
Day count convention:	See “Determination of Interest Payments” in this pricing supplement.
Business day:	Any weekday that is not a legal holiday in New York City and is not a day on which banking institutions in New York City are authorized or required by law or regulation to be closed and is a U.S. government securities business day.
U.S. government securities business day:	Any day except for a Saturday, a Sunday or a day on which the Securities Industry and Financial Markets Association recommends that the fixed income departments of its members be closed for the entire day for purposes of trading in U.S. government securities
Business day convention:	Following
CUSIP / ISIN:	17329FKX1 / US17329FKX14
Listing:	The notes will not be listed on any securities exchange and, accordingly, may have limited or no liquidity.  You should not invest in the notes unless you are willing to hold them to maturity.
Underwriter:	Citigroup Global Markets Inc. (“CGMI”), an affiliate of the issuer, acting as principal. See “General Information—Supplemental information regarding plan of distribution; conflicts of interest” in this pricing supplement.
Underwriting fee and issue price:	Issue price	Underwriting fee(1)	Proceeds to issuer
Per note:	$1,000.00	––	$1,000.00
Total:	$	––	$

(1) You should refer to “Risk Factors” and “General Information—Hedging” and “General Information—Use of Proceeds” in this pricing supplement for more information.

Investing in the notes involves risks not associated with an investment in conventional fixed rate debt securities. See “Risk Factors” beginning on page PS-2.

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

Prospectus Supplement dated May 11, 2021 and Prospectus dated May 11, 2021

The notes 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.

Risk Factors

The following is a non-exhaustive list of certain key risk factors for investors in the notes. You should read the risk factors below together with 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. We also urge you to consult your investment, legal, tax, accounting and other advisers before you decide to invest in the notes.

§ The amount of interest payable on the notes will vary. The notes differ from conventional fixed-rate debt securities in that the interest payable on the notes will vary after the initial fixed rate period based on the level of SOFR and may be as low as 0.00%.

§ The yield on the notes may be lower than the yield on a conventional fixed-rate debt security of ours of comparable maturity. During the initial fixed rate period, the notes will bear interest at a fixed rate. During the floating rate period, the interest rate applicable to the notes will vary based on the level of SOFR, and may be as low as 0.00% on each interest payment date. As a result, the effective yield on your notes may be less than that which would be payable on a conventional fixed-rate, non-callable debt security of ours (guaranteed by Citigroup Inc.) of comparable maturity.

§ The notes are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc., and any actual or perceived changes to the creditworthiness of either entity may adversely affect the value of the notes. You are subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc. If Citigroup Global Markets Holdings Inc. defaults on its obligations under the notes and Citigroup Inc. defaults on its guarantee obligations, your investment would be at risk and you could lose some or all of your investment. As a result, the value of the notes will be affected by changes in the market’s view of the creditworthiness of Citigroup Global Markets Holdings Inc. or Citigroup Inc. Any decline, or anticipated decline in the credit ratings of either entity, or any increase or anticipated increase in the credit spreads of either entity, is likely to adversely affect the value of the notes.

§ The notes will not be listed on any securities exchange and you may not be able to sell them prior to maturity. The notes will not be listed on any securities exchange. Therefore, there may be little or no secondary market for the notes. CGMI currently intends to make a secondary market in relation to the notes and to provide an indicative bid price for the notes on a daily basis. Any indicative bid price for the notes 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 notes 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 notes because it is likely that CGMI will be the only broker-dealer that is willing to buy your notes prior to maturity. Accordingly, an investor must be prepared to hold the notes until maturity.

§ 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 “General Information—Temporary adjustment period” in this pricing supplement.

§ Secondary market sales of the notes may result in a loss of principal. You will be entitled to receive at least the full stated principal amount of your notes, subject to the credit risk of Citigroup Global Markets Holdings Inc. and Citigroup Inc., only if you hold the notes to maturity. If you are able to sell your notes in the secondary market prior to maturity, you are likely to receive less than the stated principal amount of the notes.

§ The projected profit from hedging in the issue price is likely to adversely affect secondary market prices. Assuming no changes in market conditions or other relevant factors, the price, if any, at which CGMI may be willing to purchase the notes in secondary market transactions will likely be lower than the issue price since the issue price of the notes will include, and secondary market prices are likely to exclude, the cost of hedging our obligations under the notes. The cost of hedging includes the projected profit that our affiliates may realize in consideration for assuming the risks inherent in managing the hedging transactions. The secondary market prices for the notes are also likely to be reduced by the costs of unwinding the related hedging transactions. Our affiliates may realize a profit from the expected hedging activity even if the value of the notes declines. In addition, any secondary market prices for the notes may differ from values determined by pricing models used by CGMI, as a result of dealer discounts, mark-ups or other transaction costs.

§ The price at which you may be able to sell your notes prior to maturity will depend on a number of factors and may be substantially less than the amount you originally invest. A number of factors will influence the value of the notes in any secondary market that may develop and the price at which CGMI may be willing to purchase the notes in any such secondary market, including: the level and volatility of SOFR, interest rates in the market, the time remaining to maturity of the notes, hedging activities by our affiliates, fees and projected hedging fees and profits and any actual or anticipated changes in the credit ratings, financial condition and results of either Citigroup Global Markets Holdings Inc. or Citigroup Inc. The value of the notes will vary and is likely to be less than the issue price at any time prior to maturity, and sale of the notes prior to maturity may result in a loss.

§ The calculation agent, which is an affiliate of the issuer, will make determinations with respect to the notes. Citibank, N.A., the calculation agent for the notes, is an affiliate of ours. As calculation agent, Citibank, N.A. will determine, among other things, the level of SOFR and will calculate the interest payable to you on each interest payment date. Any of these determinations or calculations made by Citibank, N.A. in its capacity as calculation agent, including with respect to the calculation of the level of

PS-2

Citigroup Global Markets Holdings Inc.

SOFR in the event of the unavailability of the level of SOFR, may adversely affect the amount of one or more interest payments to you.

§ Hedging and trading activity by us and our affiliates could result in a conflict of interest. One or more of our affiliates will likely enter into hedging transactions. This hedging activity will likely involve trading in instruments, such as options, swaps or futures, based upon SOFR. This hedging activity may present a conflict between your interest in the notes and the interests our affiliates have in executing, maintaining and adjusting their hedge transactions because it could affect the price at which our affiliate CGMI may be willing to purchase your notes in the secondary market. Because hedging our obligations under the notes involves risk and may be influenced by a number of factors, it is possible that our affiliates may profit from the expected hedging activity, even if the value of the notes declines.

§ SOFR is a relatively new market index and as the related market continues to develop, there may be an adverse effect on the return on or value of the notes. The Federal Reserve Bank of New York (the “NY Federal Reserve”) began to publish SOFR in April 2018. Although the NY Federal Reserve has also begun publishing historical indicative SOFR going back to 2014, such prepublication historical data inherently involves assumptions, estimates and approximations. You should not rely on any historical changes or trends in SOFR as an indicator of the future performance of SOFR. Since the initial publication of SOFR, daily changes in the rate have, on occasion, been more volatile than daily changes in comparable benchmark or market rates. As a result, the return on the notes may fluctuate more than floating rate securities that are linked to less volatile rates.

The notes likely will have no established trading market when issued, and an established trading market may never develop or may not be very liquid. Market terms for securities indexed to SOFR, such as the spread over the index reflected in interest rate provisions, may evolve over time, and the value of the notes may be lower than those of later-issued SOFR-linked securities as a result. Similarly, if SOFR does not prove to be widely used in securities like the notes, the value of the notes may be lower than those of securities linked to rates that are more widely used. You may not be able to sell the notes at all or may not be able to sell the notes at prices that will provide a yield comparable to similar investments that have a developed secondary market, and may consequently suffer from increased pricing volatility and market risk.

The NY Federal Reserve notes on its publication page for SOFR that use of SOFR is subject to important limitations, indemnification obligations and disclaimers, including that the NY Federal Reserve may alter the methods of calculation, publication schedule, rate revision practices or availability of SOFR at any time without notice. There can be no guarantee that SOFR will not be discontinued or fundamentally altered in a manner that is materially adverse to the interests of investors in the notes. If the manner in which SOFR is calculated is changed or if SOFR is discontinued, that change or discontinuance may result in a reduction or elimination of the amount of interest payable on the notes and a reduction in the value of the notes.

§ The formula used to determine the interest rate on the notes during the floating rate period is relatively new in the market, and as the related market continues to develop there may be an adverse effect on return on or value of the notes. The interest rate on the notes is based on a formula used to calculate a daily compounded SOFR rate, which is relatively new in the market. For each interest period during the floating rate period, the interest rate on the notes is based on a daily compounded SOFR rate calculated using the formula described in “Determination of SOFR” below. This interest rate will not be the SOFR rate published on or for a particular day during such interest period or an average of SOFR rates during such period nor will it be the same as the interest rate on other SOFR-linked notes that use an alternative formula to determine the interest rate. Also, if the SOFR rate for a particular day during an interest period is negative, inclusion of that rate in the calculation will reduce the interest rate for such interest period; provided that in no event will the interest payable on the notes be less than zero.

Additionally, market terms for notes linked to SOFR may evolve over time, and the value of the notes may be lower than those of later-issued SOFR-linked securities as a result. Similarly, if the formula to calculate daily compounded SOFR for the notes does not prove to be widely used in other securities like the notes, the trading price of the notes may be lower than those of securities having a formula more widely used. You may not be able to sell the notes at all or may not be able to sell the notes at prices that will provide a yield comparable to similar investments that have a developed secondary market, and may consequently suffer from increased pricing volatility and market risk.

The NY Federal Reserve (or a successor), as administrator of SOFR, may also make methodological or other changes that could change the value of SOFR, including changes related to the method by which SOFR is calculated, eligibility criteria applicable to the transactions used to calculate SOFR, or timing related to the publication of SOFR. In addition, the administrator may alter, discontinue or suspend calculation or dissemination of SOFR (in which case a fallback method of determining interest rates on the notes will apply). The administrator has no obligation to consider the interests of holders of notes when calculating, adjusting, converting, revising or discontinuing SOFR.

§ The interest rate on the notes during the floating rate period will be determined using alternative methods if SOFR is no longer available, and that may have an adverse effect on the return on and value of the notes. The terms of the notes provide that if a benchmark transition event and its related benchmark replacement date occur with respect to SOFR, the interest rate payable on the notes during the floating rate period will be determined using the next-available benchmark replacement. As described above, these replacement rates and spreads may be selected or formulated by (i) the relevant governmental body (such as the Alternative Reference Rates Committee of the NY Federal Reserve) (ii) the International Swaps and Derivatives Association, Inc. or (iii) in certain circumstances, Citigroup (or one of its affiliates). In addition, the terms of the notes expressly authorize Citigroup (or one of its affiliates) to make benchmark replacement conforming changes with respect to, among other things, the determination of interest periods and the timing and frequency of determining rates and making payments of interest during the floating rate period. The interests of Citigroup (or its affiliate) in making the determinations described above may be adverse to your interests as a holder of the notes.

PS-3

Citigroup Global Markets Holdings Inc.

The application of a benchmark replacement and benchmark replacement adjustment, and any implementation of benchmark replacement conforming changes, or any implementation of a substitute, successor or alternative reference rate could result in adverse consequences to the interest rate payable on the notes, which could adversely affect the return on, value of and market for the notes. Further, there is no assurance that the characteristics of any substitute, successor or alternative reference rate or benchmark replacement will be similar to SOFR or the then-current benchmark that it is replacing, or that any benchmark replacement will produce the economic equivalent of SOFR or the then-current benchmark that it is replacing.

§ We or our subsidiaries or affiliates may publish research that could affect the market value of the notes. We or our subsidiaries or affiliates may, at present or in the future, publish research reports with respect to movements in interest rates generally, or the LIBOR transition or SOFR specifically. This research is modified from time to time without notice and may express opinions or provide recommendations that are inconsistent with purchasing or holding the notes. Any of these activities may affect the market value of the notes.

§ You will have no rights against the publisher of SOFR. You will have no rights against the publisher of SOFR even though the amount you receive on each interest payment date relating to an interest period during the floating rate period will depend upon the level of SOFR. The publisher of SOFR is not in any way involved in this offering and has no obligations relating to the notes or the holders of the notes.

General Information
Temporary adjustment period:	For a period of approximately three months following issuance of the notes, the price, if any, at which CGMI would be willing to buy the notes from investors, and the value that will be indicated for the notes 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 notes. 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 notes from investors at any time.  See “Risk Factors—The notes will not be listed on any securities exchange and you may not be able to sell them prior to maturity.”
U.S. federal income tax considerations:	In the opinion of our counsel, Davis Polk & Wardwell LLP, the notes will be treated as “variable rate debt instruments,” and the remaining discussion is based on this treatment. Based on market conditions as of the pricing date, we will determine whether the notes are treated for U.S. federal income tax purposes (1) as providing for a single qualified floating rate (“QFR”) or (2) as providing for a single fixed rate followed by a QFR. If the initial fixed rate on the notes is within 25 basis points of the floating rate, we expect to treat the notes as providing for a single floating rate. Under this treatment, all stated interest on the notes will generally be treated as qualified stated interest (“QSI”) and be taxable to a U.S. Holder (as defined in the accompanying prospectus supplement) at the time it accrues or is received in accordance with the U.S. Holder’s method of tax accounting. However, if the initial fixed rate is not within 25 basis points of the floating rate, the notes may be treated as issued with original issue discount (“OID”). In order to determine the amount of QSI and OID in respect of the notes, an equivalent fixed rate debt instrument must be constructed. The equivalent fixed rate debt instrument is constructed in the following manner: (i) first, the initial fixed rate is converted to a QFR that would preserve the fair market value of the notes, and (ii) second, each QFR (including the QFR determined under (i) above) is converted to a fixed rate substitute (which will generally be the value of that QFR as of the issue date of the notes). The rules described under “United States Federal Tax Considerations — Tax Consequences to U.S. Holders — Original Issue Discount” in the accompanying prospectus supplement are then applied to the equivalent fixed rate debt instrument for purposes of calculating the amount of OID on the notes. Under these rules, the notes will generally be treated as providing for QSI at a rate equal to the lowest rate of interest in effect at any time under the equivalent fixed rate debt instrument, and any interest in excess of that rate will generally be treated as part of the stated redemption price at maturity and, therefore, as giving rise to OID. Based on the application of these rules to the notes, we will indicate in the final pricing supplement if the notes are issued with OID. QSI on the notes will generally be taxable to a U.S. Holder (as defined in the accompanying prospectus supplement) as ordinary interest income at the time it accrues or is received in accordance with the U.S. Holder’s method of tax accounting. If the notes are issued with OID, a U.S. Holder will be required to include the OID in income for federal income tax purposes as it accrues, in accordance with a constant-yield method based on a compounding of interest. If the

PS-4

Citigroup Global Markets Holdings Inc.

	notes are not issued with OID, all stated interest on the notes will be treated as QSI and will be taxable to a U.S. Holder as ordinary interest income at the time it accrues or is received in accordance with the U.S. Holder’s method of tax accounting. If the amount of interest a U.S. Holder receives on the notes in a calendar year is greater than the interest assumed to be paid or accrued under the equivalent fixed rate debt instrument, the excess is treated as additional QSI taxable to the U.S. Holder as ordinary income. Otherwise, any difference will reduce the amount of QSI the U.S. Holder is treated as receiving and will therefore reduce the amount of ordinary income the U.S. Holder is required to take into income. Upon the sale or other taxable disposition of a note, a U.S. Holder generally will recognize capital gain or loss equal to the difference between the amount realized on the disposition (other than any amount attributable to accrued QSI, which will be treated as a payment of interest) and the U.S. Holder’s tax basis in the note. A U.S. Holder’s tax basis in a note generally will equal the cost of the note to the U.S. Holder, increased by the amounts of OID (if any) previously included in income by the U.S. Holder with respect to the note and reduced by any payments other than QSI received by the U.S. Holder. Such gain or loss generally will be long-term capital gain or loss if the U.S. Holder has held the note for more than one year at the time of disposition. Under current law Non-U.S. Holders (as defined in the accompanying prospectus supplement) generally will not be subject to U.S. federal withholding or income tax with respect to interest (or OID, if any) paid on and amounts received on the sale, exchange or retirement of the notes if they comply with applicable certification requirements. Special rules apply to Non-U.S. Holders whose income on the notes is effectively connected with the conduct of a U.S. trade or business or who are individuals present in the United States for 183 days or more in a taxable year. The discussions herein and in the accompanying prospectus supplement do not address the consequences to taxpayers subject to special tax accounting rules under Section 451(b) of the Internal Revenue Code of 1986, as amended. You should read the section entitled “United States Federal Tax Considerations” in the accompanying prospectus 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 notes. You should also consult your tax adviser regarding all aspects of the U.S. federal tax consequences of an investment in the notes and any tax consequences arising under the laws of any state, local or non-U.S. taxing jurisdiction.
Trustee:	The Bank of New York Mellon (as trustee under an indenture dated March 8, 2016) will serve as trustee for the notes.
Use of proceeds:	An amount equal to the net proceeds of the sale of the notes will be allocated exclusively to finance or refinance, in whole or in part, “Affordable Housing Assets,” which refers to loans and/or investments made by Citigroup Inc. and its affiliates (“Citi”) for assets or projects that meet Citi’s Affordable Housing Bond Asset Portfolio Eligibility Criteria (as defined below) in accordance with the Citi Social Bond Framework for Affordable Housing (the “Framework”). Citi has developed the Framework for notes issuances in order to finance the construction, rehabilitation and/or preservation of quality affordable housing for low- and moderate-income populations in the United States. The Framework is available on our website and has received a “second party opinion” by an independent consultant. Eligible Affordable Housing Assets Citi’s “Affordable Housing Bond Asset Portfolio Eligibility Criteria” reflect good practices for financing or refinancing the affordable housing needs (each, an “Affordable Housing Asset”) of individuals and families living in low- and moderate-incomes. “Low-income” is a family income that is less than 50% of the area’s median family income. “Moderate-income” is a family income that is at least 50% and less than 80% of the area’s median family income. The Affordable Housing Assets may include but are not limited to affordable residences or housing units tailored to the needs of protected or vulnerable populations such as the following: (1)       those experiencing homelessness: the term ‘‘homeless’’ refers to an individual who lacks housing (without regard to whether the individual is a member of a family), including an individual whose primary residence during the night is a supervised public or private facility that

PS-5

Citigroup Global Markets Holdings Inc.

provides temporary living accommodations and an individual who is a resident in transitional housing;

(2)       senior citizens: a single person who is older than 55 years of age or families of two or more persons where the head of which (or his or her spouse) is older than 55 years of age;

(3)       Veterans: a person who served in the active military, naval, or air service and who was discharged or released under conditions other than dishonorable; and

(4)       persons with disabilities: a person who has a physical or mental impairment that substantially limits one or more major life activities, a person who has a history or record of such an impairment, or a person who is perceived by others as having such an impairment.

Citi has developed a list of exclusionary criteria for the use of the proceeds from the sale of the notes. Citi does not intend to be involved in financing any of the following projects or activities through the proceeds of this offering:

(1)       loans or investments for projects outside of the United States and its territories;

(2)       loans or investments that do not have a primary purpose of providing affordable housing for low- and moderate-income individuals or families;

(3)       mortgage-backed securities and other derivatives;

(4)       investments where the financial strength and potential for economic loss to Citi on the investment has been assessed and classified as “Substandard,” “Doubtful,” or “Loss”;

(5)       any activities which are incompatible with the social mission of Citi Community Capital (a specialized unit within Citi that provides financial products for affordable housing) or which are directly or indirectly generating significant adverse social impacts; or

(6)       loans or investments that have matured.

Asset Selection and Evaluation Process

Citi’s specialist teams, including Citi Community Capital, are responsible for screening potential eligible assets against the Affordable Housing Bond Asset Portfolio Eligibility Criteria. Once screened, Eligible Affordable Housing Assets will be added to Citi’s portfolio of affordable housing assets (the “Affordable Housing Bond Asset Portfolio”).

Citi will identify a unique Affordable Housing Bond Asset Portfolio for the “Affordable Housing Bond(s)” issued during a given reporting period. Citi’s selection process for the Eligible Affordable Housing Assets takes into account whether the potential eligible asset meets the Affordable Housing Bond Asset Portfolio Eligibility Criteria for inclusion in an Affordable Housing Bond Asset Portfolio. Additionally, each of Citi’s lending and investing projects in affordable housing developments is reviewed through Citi’s approval processes including credit risk management approval and internal audit and compliance processes. If Citi’s investment in any asset in an Affordable Housing Bond Asset Portfolio is terminated or if an asset no longer meets the eligibility criteria, the asset will be removed from an Affordable Housing Bond Asset Portfolio in the same calendar year in which the asset became ineligible.

Management of Proceeds

Citi’s Affordable Housing Bond Working Group (the “Group”) is responsible for oversight of the Affordable Housing Bond Asset Portfolio(s), and its responsibilities include monitoring the total aggregate amount of Affordable Housing Bonds issued and tracking the portfolio using an internal asset management system. The Group aims to ensure that the aggregate amount in each Affordable Housing Bond Asset Portfolio is equal to or greater than the aggregate amount raised by Affordable Housing Bonds during the associated reporting period by reviewing the aggregate size and maturity of the Affordable Housing Bond Asset Portfolio(s) each quarter.

If for any reason the aggregate amount in an Affordable Housing Bond Asset Portfolio is less than the total outstanding amount of Affordable Housing Bonds issued, Citi will assign the unallocated balance to cash, cash equivalents and/or other liquid marketable instruments (including U.S. Treasury securities) until the amount can be allocated towards the Affordable Housing Bond Asset Portfolio.

Reporting

Citi will publish an Affordable Housing Bond report on its website within a year from issuance of the notes and provide updated information should a material change occur in the Affordable Housing Bond Asset Portfolio.

External Review 

PS-6

Citigroup Global Markets Holdings Inc.

	Citi will engage external independent accountants to review that the assets including in the Affordable Housing Bond Asset Portfolio(s) meet the Affordable Housing Bond Asset Portfolio Eligibility Criteria and are not invested in assets as defined by the exclusionary criteria. Further, the   independent accountants have been engaged to review that the aggregate amount in the Affordable Housing Bond Asset Portfolio(s) is equal to or greater than the aggregate amount raised by Affordable Housing Bonds, and to the extent the total amount of the outstanding bonds is greater than the aggregate amount in the Affordable Housing Bond Asset Portfolio(s), the difference will be held in cash, cash equivalents and/or other liquid marketable instruments (including U.S. Treasury securities) in Citi’s liquidity portfolio.
Hedging:	Hedging activities related to the notes by one or more of our affiliates involves trading in one or more instruments, such as options, swaps and/or futures, based on SOFR and/or taking positions in any other available securities or instruments that we may wish to use in connection with such hedging and may include adjustments to such positions during the term of the notes. It is possible that our affiliates may profit from this hedging activity, even if the value of the notes declines. Profit or loss from this hedging activity could affect the price at which Citigroup Global Markets Holdings Inc.’s affiliate, CGMI, may be willing to purchase your notes in the secondary market. For further information on our use of proceeds and hedging, see “Use of Proceeds and Hedging” in the accompanying prospectus.
ERISA and IRA purchase considerations:	Please refer to “Benefit Plan Investor Considerations” in the accompanying prospectus supplement for important information for investors that are ERISA or other benefit plans or whose underlying assets include assets of such plans.
Fees and selling concessions:	CGMI, an affiliate of Citigroup Global Markets Holdings Inc., is the underwriter of the sale of the notes and is acting as principal.  CGMI may resell the notes to other securities dealers at the issue price of $1,000 per note.
Supplemental information regarding plan of distribution; conflicts of interest:	The terms and conditions set forth in the Amended and Restated Global Selling Agency Agreement dated April 7, 2017 among Citigroup Global Markets Holdings Inc., Citigroup Inc. and the agents named therein, including CGMI, govern the sale and purchase of the notes. In order to hedge its obligations under the notes, Citigroup Global Markets Holdings Inc. expects to enter into one or more swaps or other derivatives transactions with one or more of its affiliates. You should refer to the section “General Information—Hedging” in this pricing supplement and the section “Use of Proceeds and Hedging” in the accompanying prospectus. See “Plan of Distribution; Conflicts of Interest” in the accompanying prospectus supplement for more information.
Calculation agent:	Citibank, N.A., an affiliate of Citigroup Inc., will serve as calculation agent for the notes. All determinations made by the calculation agent will be at the sole discretion of the calculation agent and will, in the absence of manifest error, be conclusive for all purposes and binding on Citigroup Global Markets Holdings Inc. and the holders of the notes. Citibank, N.A. is obligated to carry out its duties and functions as calculation agent in good faith and using its reasonable judgment.
Paying agent:	Citibank, N.A. will serve as paying agent and registrar and will also hold the global security representing the notes as custodian for The Depository Trust Company (“DTC”).
Contact:	Clients may contact their local brokerage representative. Third party distributors may contact Citi Structured Investment Sales at (212) 723-7005.

We encourage you to also read the accompanying prospectus supplement and prospectus, which can be accessed via the hyperlink on the cover page of this pricing supplement.

Determination of Interest Payments

On each interest payment date relating to an interest period during the initial fixed rate period, the amount of each interest payment will equal (i) the stated principal amount of the notes multiplied by the interest rate in effect during the applicable interest period, multiplied by (ii) the number of calendar days in such interest period divided by 360.

On each interest payment date relating to an interest period during the floating rate period, the amount of each interest payment will equal the stated principal amount of the notes multiplied by the sum of the interest factors calculated for each day during such interest period; provided that in no event will the interest payment be less than zero. The “interest factor” for each such day will be computed by

PS-7

Citigroup Global Markets Holdings Inc.

dividing the interest rate applicable to that day by 360. The interest rate applicable to each such day will be equal to the accrued interest compounding factor (as defined under “Determination of SOFR” below) plus the floating rate spread.

Determination of SOFR

For the purposes of calculating interest with respect to any interest period during the floating rate period:

“Accrued interest compounding factor” means the result of the following formula:

where:

“d₀”, for any interest period, is the number of U.S. government securities business days in the relevant interest period.

“i” is a series of whole numbers from one to d₀, each representing the relevant U.S. government securities business days in chronological order from, and including, the first U.S. government securities business day in the relevant interest period.

“SOFR_i”, for any day “i” in the relevant interest period, is a reference rate equal to SOFR in respect of that day.

“n_i”, for any day “i” in the relevant interest period, is the number of calendar days from, and including, such U.S. government securities business day “i” to, but excluding, the following U.S. government securities business day.

“d” is the number of calendar days in the relevant interest period.

“SOFR” means, with respect to any day, the rate determined by the calculation agent in accordance with the following provisions:

(1) the Secured Overnight Financing Rate for trades made on such day that appears at approximately 3:00 p.m. (New York City time) on the NY Federal Reserve’s website on the U.S. government securities business day immediately following such U.S. government securities business day; or

(2) if the rate specified in (1) above does not so appear, unless a benchmark transition event and its related benchmark replacement date have occurred as described in (3) below, the Secured Overnight Financing Rate published on the NY Federal Reserve’s website for the first preceding U.S. government securities business day for which the Secured Overnight Financing Rate was published on the NY Federal Reserve’s website; or

(3) if a benchmark transition event and its related benchmark replacement date have occurred prior to the relevant interest period end date, the calculation agent will use the benchmark replacement to determine the rate and for all other purposes relating to the notes.

In connection with the SOFR definition above, the following definitions apply:

“Benchmark” means, initially, SOFR; provided that if a benchmark transition event and its related benchmark replacement date have occurred with respect to SOFR or the then-current benchmark, then “benchmark” means the applicable benchmark replacement.

“Benchmark replacement” means the first alternative set forth in the order below that can be determined by Citigroup (or one of its affiliates) as of the benchmark replacement date:

(1) the sum of: (a) the alternate rate of interest that has been selected or recommended by the relevant governmental body as the replacement for the then-current benchmark for the applicable corresponding tenor and (b) the benchmark replacement adjustment; or

(2) the sum of: (a) the ISDA fallback rate and (b) the benchmark replacement adjustment; or

(3) the sum of: (a) the alternate rate of interest that has been selected by Citigroup (or one of its affiliates) as the replacement for the then-current benchmark for the applicable corresponding tenor giving due consideration to any industry-accepted rate of interest as a replacement for the then-current benchmark for U.S. dollar-denominated floating rate notes at such time and (b) the benchmark replacement adjustment.

“Benchmark replacement adjustment” means the first alternative set forth in the order below that can be determined by Citigroup (or one of its affiliates) as of the benchmark replacement date:

(1) the spread adjustment, or method for calculating or determining such spread adjustment, (which may be a positive or negative value or zero) that has been selected or recommended by the relevant governmental body for the applicable unadjusted benchmark replacement;

(2) if the applicable unadjusted benchmark replacement is equivalent to the ISDA fallback rate, then the ISDA fallback adjustment;

(3) the spread adjustment (which may be a positive or negative value or zero) that has been selected by Citigroup (or one of its affiliates) giving due consideration to any industry-accepted spread adjustment, or method for calculating or determining such spread adjustment, for the replacement of the then-current benchmark with the applicable unadjusted benchmark replacement for U.S. dollar-denominated floating rate notes at such time.

PS-8

Citigroup Global Markets Holdings Inc.

“Benchmark replacement conforming changes” means, with respect to any benchmark replacement, any technical, administrative or operational changes that Citigroup (or one of its affiliates) decides may be appropriate to reflect the adoption of such benchmark replacement in a manner substantially consistent with market practice (or, if Citigroup (or such affiliate) decides that adoption of any portion of such market practice is not administratively feasible or if Citigroup (or such affiliate) determines that no market practice for use of the benchmark replacement exists, in such other manner as Citigroup (or such affiliate) determines is reasonably necessary).

“Benchmark replacement date” means the earliest to occur of the following events with respect to the then-current benchmark:

(1) in the case of clause (1) or (2) of the definition of “benchmark transition event,” the later of (a) the date of the public statement or publication of information referenced therein and (b) the date on which the administrator of the benchmark permanently or indefinitely ceases to provide the benchmark; or

(2) in the case of clause (3) of the definition of “benchmark transition event,” the date of the public statement or publication of information referenced therein.

For the avoidance of doubt, if the event giving rise to the benchmark replacement date occurs on the same day as, but earlier than, the reference time in respect of any determination, the benchmark replacement date will be deemed to have occurred prior to the reference time for such determination.

“Benchmark transition event” means the occurrence of one or more of the following events with respect to the then-current Benchmark:

(1) a public statement or publication of information by or on behalf of the administrator of the benchmark announcing that such administrator has ceased or will cease to provide the benchmark, permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the benchmark;

(2) a public statement or publication of information by the regulatory supervisor for the administrator of the benchmark, the central bank for the currency of the benchmark, an insolvency official with jurisdiction over the administrator for the benchmark, a resolution authority with jurisdiction over the administrator for the benchmark or a court or an entity with similar insolvency or resolution authority over the administrator for the benchmark, which states that the administrator of the benchmark has ceased or will cease to provide the benchmark permanently or indefinitely, provided that, at the time of such statement or publication, there is no successor administrator that will continue to provide the benchmark; or

(3) a public statement or publication of information by the regulatory supervisor for the administrator of the benchmark announcing that the benchmark is no longer representative.

“Corresponding tenor” with respect to a benchmark replacement means a tenor (including overnight) having approximately the same length (disregarding business day adjustment) as the applicable tenor for the then-current benchmark.

“ISDA” means the International Swaps and Derivatives Association, Inc. or any successor thereto.

“ISDA definitions” means the 2006 ISDA Definitions published by ISDA, as amended or supplemented from time to time, or any successor definitional booklet for interest rate derivatives published from time to time.

“ISDA fallback adjustment” means the spread adjustment (which may be a positive or negative value or zero) that would apply for derivatives transactions referencing the ISDA definitions to be determined upon the occurrence of an index cessation event with respect to the benchmark for the applicable tenor.

“ISDA fallback rate” means the rate that would apply for derivatives transactions referencing the ISDA definitions to be effective upon the occurrence of an index cessation date with respect to the benchmark for the applicable tenor excluding the applicable ISDA fallback adjustment.

“NY Federal Reserve” means the Federal Reserve Bank of New York.

“NY Federal Reserve’s website” means the website of the NY Federal Reserve, currently at http://www.newyorkfed.org, or any successor website of the NY Federal Reserve or the website of any successor administrator of the Secured Overnight Financing Rate.

“Reference time” with respect to any determination of the benchmark means the time determined by Citigroup (or one of its affiliates) in accordance with the benchmark replacement conforming changes.

“Relevant governmental body” means the Federal Reserve Board and/or the NY Federal Reserve, or a committee officially endorsed or convened by the Federal Reserve Board and/or the NY Federal Reserve or any successor thereto.

“Unadjusted benchmark replacement” means the benchmark replacement excluding the benchmark replacement adjustment.

About SOFR

SOFR is published by the NY Federal Reserve and is intended to be a broad measure of the cost of borrowing cash overnight collateralized by Treasury securities. The NY Federal Reserve reports that SOFR includes all trades in the Broad General Collateral Rate, plus bilateral Treasury repurchase agreement (“repo”) transactions cleared through the delivery-versus-payment service offered by the Fixed Income Clearing Corporation (the “FICC”), a subsidiary of The Depository Trust & Clearing Corporation (“DTCC”). SOFR is filtered by the NY Federal Reserve to remove a portion of the foregoing transactions considered to be “specials”. According to the NY Federal Reserve, “specials” are repos for specific-issue collateral which take place at cash-lending rates below those for general collateral repos because cash providers are willing to accept a lesser return on their cash in order to obtain a particular security.

PS-9

Citigroup Global Markets Holdings Inc.

The NY Federal Reserve reports that SOFR is calculated as a volume-weighted median of transaction-level tri-party repo data collected from The Bank of New York Mellon, which currently acts as the clearing bank for the tri-party repo market, as well as General Collateral Finance Repo transaction data and data on bilateral Treasury repo transactions cleared through the FICC’s delivery-versus-payment service. The NY Federal Reserve notes that it obtains information from DTCC Solutions LLC, an affiliate of DTCC.

The NY Federal Reserve currently publishes SOFR daily on its website. The NY Federal Reserve states on its publication page for SOFR that use of SOFR is subject to important disclaimers, limitations and indemnification obligations, including that the NY Federal Reserve may alter the methods of calculation, publication schedule, rate revision practices or availability of SOFR at any time without notice. Information contained in the publication page for SOFR is not incorporated by reference in, and should not be considered part of, this pricing supplement.

PS-10

Citigroup Global Markets Holdings Inc.

Historical Information on SOFR

SOFR was 0.01% on May 24, 2021.

The graph below shows the published daily rate for SOFR for each day it was available from April 2, 2018 to May 24, 2021. We obtained the values below from Bloomberg L.P., without independent verification. You should not take the historical performance of SOFR as an indication of future performance.

The historical rates do not reflect the daily compounding method used to calculate the floating rate at which interest will be payable on the notes during the floating rate period.

Historical SOFR 

April 2, 2018 to May 24, 2021 

Certain Selling Restrictions

Hong Kong Special Administrative Region

The contents of this pricing supplement and the accompanying prospectus supplement and prospectus have not been reviewed by any regulatory authority in the Hong Kong Special Administrative Region of the People’s Republic of China (“Hong Kong”). Investors are advised to exercise caution in relation to the offer. If investors are in any doubt about any of the contents of this pricing supplement and the accompanying prospectus supplement and prospectus, they should obtain independent professional advice.

The notes have not been offered or sold and will not be offered or sold in Hong Kong by means of any document, other than

(i) to persons whose ordinary business is to buy or sell shares or debentures (whether as principal or agent); or

(ii) to “professional investors” as defined in the Securities and Futures Ordinance (Cap. 571) of Hong Kong (the “Securities and Futures Ordinance”) and any rules made under that Ordinance; or

(iii) in other circumstances which do not result in the document being a “prospectus” as defined in the Companies Ordinance (Cap. 32) of Hong Kong or which do not constitute an offer to the public within the meaning of that Ordinance; and

There is no advertisement, invitation or document relating to the notes which is directed at, or the contents of which are likely to be accessed or read by, the public of Hong Kong (except if permitted to do so under the securities laws of Hong Kong) other than with respect to securities which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” as defined in the Securities and Futures Ordinance and any rules made under that Ordinance.

PS-11

Citigroup Global Markets Holdings Inc.

Non-insured Product: These notes are not insured by any governmental agency. These notes are not bank deposits and are not covered by the Hong Kong Deposit Protection Scheme.

Singapore

This pricing supplement and the accompanying prospectus supplement and prospectus have not been registered as a prospectus with the Monetary Authority of Singapore, and the notes will be offered pursuant to exemptions under the Securities and Futures Act, Chapter 289 of Singapore (the “Securities and Futures Act”). Accordingly, the notes may not be offered or sold or made the subject of an invitation for subscription or purchase nor may this pricing supplement or any other document or material in connection with the offer or sale or invitation for subscription or purchase of any notes be circulated or distributed, whether directly or indirectly, to any person in Singapore other than (a) to an institutional investor pursuant to Section 274 of the Securities and Futures Act, (b) to a relevant person under Section 275(1) of the Securities and Futures Act or to any person pursuant to Section 275(1A) of the Securities and Futures Act and in accordance with the conditions specified in Section 275 of the Securities and Futures Act, or (c) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the Securities and Futures Act. Where the notes are subscribed or purchased under Section 275 of the Securities and Futures Act by a relevant person which is:

(a) a corporation (which is not an accredited investor (as defined in Section 4A of the Securities and Futures Act)) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or

(b) a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary is an individual who is an accredited investor, securities (as defined in Section 239(1) of the Securities and Futures Act) of that corporation or the beneficiaries’ rights and interests (howsoever described) in that trust shall not be transferable for 6 months after that corporation or that trust has acquired the relevant securities pursuant to an offer under Section 275 of the Securities and Futures Act except:

(i) to an institutional investor or to a relevant person defined in Section 275(2) of the Securities and Futures Act or to any person arising from an offer referred to in Section 275(1A) or Section 276(4)(i)(B) of the Securities and Futures Act; or

(ii) where no consideration is or will be given for the transfer; or

(iii) where the transfer is by operation of law; or

(iv) pursuant to Section 276(7) of the Securities and Futures Act; or

(v) as specified in Regulation 32 of the Securities and Futures (Offers of Investments) (Shares and Debentures) Regulations 2005 of Singapore.

Any notes referred to herein may not be registered with any regulator, regulatory body or similar organization or institution in any jurisdiction.

The notes are Specified Investment Products (as defined in the Notice on Recommendations on Investment Products and Notice on the Sale of Investment Product issued by the Monetary Authority of Singapore on 28 July 2011) that is neither listed nor quoted on a securities market or a futures market.

Non-insured Product: These notes are not insured by any governmental agency. These notes are not bank deposits. These notes are not insured products subject to the provisions of the Deposit Insurance and Policy Owners’ Protection Schemes Act 2011 of Singapore and are not eligible for deposit insurance coverage under the Deposit Insurance Scheme.

Prohibition of Sales to EEA Retail Investors

The notes may not be offered, sold or otherwise made available to any retail investor in the European Economic Area. For the purposes of this provision:

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

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

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

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

(b) the expression “offer” includes the communication in any form and by any means of sufficient information on the terms of the offer and the notes offered so as to enable an investor to decide to purchase or subscribe the notes.

PS-12

Citigroup Global Markets Holdings Inc.

Additional Information

We reserve the right to withdraw, cancel or modify any offering of the notes and to reject orders in whole or in part prior to their issuance.

© 2021 Citigroup Global Markets Inc. All rights reserved. Citi and Citi and Arc Design are trademarks and service marks of Citigroup Inc. or its affiliates and are used and registered throughout the world.

PS-13