Linked to the Least Performing of the S&P 500^® Index and the Russell 2000^® Index

The Autocallable Buffered Notes with Step-up Premium and Upside Participation (each a “Note” and collectively the “Notes”) offered hereunder will not be listed on any securities exchange or automated quotation system.

Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of the Notes or passed upon the accuracy or the adequacy of this document, the accompanying prospectus, prospectus supplement or Equity Index Underlying Supplement. Any representation to the contrary is a criminal offense.

We have appointed HSBC Securities (USA) Inc., an affiliate of ours, as the agent for the sale of the Notes. HSBC Securities (USA) Inc. will purchase the Notes from us for distribution to other registered broker-dealers or will offer the Notes directly to investors. In addition, HSBC Securities (USA) Inc. or another of its affiliates or agents may use the pricing supplement to which this free writing prospectus relates in market-making transactions in any Notes after their initial sale. Unless we or our agent inform you otherwise in the confirmation of sale, the pricing supplement to which this free writing prospectus relates is being used in a market-making transaction. See “Supplemental Plan of Distribution (Conflicts of Interest)” on page FWP-17 of this document.

Investment in the Notes involves certain risks. You should refer to “Risk Factors” beginning on page FWP-9 of this document, page S-1 of the accompanying prospectus supplement and page S-1 of the accompanying Equity Index Underlying Supplement.

The Estimated Initial Value of the Notes on the Trade Date is expected to be between $880.00 and $990.00 per Note, which will be less than the price to public. The market value of the Notes at any time will reflect many factors and cannot be predicted with accuracy. See “Estimated Initial Value” on page FWP-5 and “Risk Factors” beginning on page FWP-9 of this document for additional information.

¹HSBC USA Inc. or one of our affiliates may pay varying underwriting discounts of up to 0.50% per $1,000 Principal Amount in connection with the distribution of the Notes to other registered broker-dealers. See “Supplemental Plan of Distribution (Conflicts of Interest)” on page FWP-17 of this document.

Indicative Terms⁽¹⁾

Principal Amount	$1,000 per Note
Term	Approximate 5 year term if not called.
Reference Asset	The S&P 500^® Index (Ticker: SPX) and the Russell 2000^® Index (Ticker: RTY) (each an “Underlying” and together the “Underlyings”)
Call Feature	The Notes will be automatically called if the Official Closing Level of each Underlying is at or above its Call Threshold on any Call Observation Date on or after May 23, 2022 to and including November 21, 2025. In that case, you will receive a cash payment, per $1,000 Principal Amount, equal to the Principal Amount plus the Call Premium payable on the corresponding Call Payment Date⁽²⁾
Call Threshold	For each Underlying on a Call Observation Date, the relevant percentage of the Initial Value of such Underlying applicable on such Call Observation Date as described on page FWP-5 under “Call Observation Dates, Call Payment Dates, Call Premiums and Call Thresholds.”
Call Premium	4.70% (to be determined on the Trade Date) multiplied by the number of semi-annual periods elapsed from the Trade Date to the applicable Observation Date that the Notes are called)⁽²⁾
Upside Participation Rate	If the Notes are not called, 100% (1.00x) exposure to any positive Reference Return of the Least Performing Underlying
Buffer Value	With respect to each Underlying, 90.00% of its Initial Value
Payment at Maturity per Note	Unless the Notes are called, for each $1,000 Principal Amount, you will receive a cash payment on the Maturity Date, calculated as follows: n If the Reference Return of the Least Performing Underlying is greater than 0.00%: $1,000 + ($1,000 × Reference Return of the Least Performing Underlying× Upside Participation Rate); n If the Reference Return of the Least Performing Underlying is less than or equal to 0.00%, but greater than or equal to -10.00%: $1,000 (a zero return) n If the Reference Return of the Least Performing Underlying is less than -10.00%: $1,000 + [$1,000 × (Reference Return of the Least Performing Underlying + 10.00%)]. If the Notes are not called and the Final Value of the Least Performing Underlying is less than its Buffer Value you will receive protection from the first 10.00% of any losses, with 1.00x exposure to each 1% decline beyond a Reference Return of the Least Performing Underlying of -10.00%. Under these circumstances, you will lose some or a significant portion (up to 90.00%) of the Principal Amount.
Reference Return	With respect to each Underlying, Final Value – Initial Value Initial Value
Least Performing Underlying	The Underlying with the lowest Reference Return
Trade Date	May 21, 2021
Pricing Date	May 21, 2021
Original Issue Date	May 26, 2021
Final Valuation Date⁽³⁾	May 20, 2026
Maturity Date⁽³⁾	May 26, 2026
CUSIP/ISIN	40438JAV7/US40439JAV70

The Notes

The Notes may be suitable for investors who believe that the value of the Underlyings will not decrease significantly over the term of the Notes.

If the Official Closing Level of each Underlying is at or above its Call Threshold on any Call Observation Date beginning on May 23, 2022 to and including November 21, 2025, your Notes will be automatically called and you will receive a payment equal to 100% of the Principal Amount, together with the applicable Call Premium on the corresponding Call Payment Date.

If the Notes are not called prior to maturity and the Reference Return of the Least Performing Underlying (i) is greater than 0.00%, the Notes will provide 100% (1.00x) exposure on the Reference Return of the Least Performing Underlying; (ii) is less than or equal to zero but greater than or equal to -10.00%, you will receive your principal amount (a zero return); or (iii) is less than -10.00%, you will receive protection from the first 10.00% of any losses, with 1.00x exposure to each 1% decline that the Reference Return of the Least Performing Underlying is less than-10.00%. Under these circumstances lose some or a significant portion (up to 90.00%) of the Principal Amount.

This document relates to a single offering of Autocallable Buffered Notes with Step-up Premium and Upside Participation. The Notes will have the terms described in this document and the accompanying prospectus, prospectus supplement, and Equity Index Underlying Supplement. If the terms of the Notes offered hereby are inconsistent with those described in the accompanying prospectus, prospectus supplement, or Equity Index Underlying Supplement, the terms described in this document shall control.

This document relates to an offering of Notes linked to the Reference Asset. The purchaser of a Note will acquire a senior unsecured debt security of HSBC USA Inc. linked to the Reference Asset as described below. The following key terms relate to the offering of the Notes:

The Trade Date, the Pricing Date and the other dates set forth above are subject to change, and will be set forth in the pricing supplement relating to the Notes.

This document relates to an offering of Notes linked to the Reference Asset. The purchaser of a Note will acquire a senior unsecured debt security of HSBC USA Inc. We reserve the right to withdraw, cancel or modify this offering and to reject orders in whole or in part. Although the offering of Notes relates to the Reference Asset, you should not construe that fact as a recommendation as to the merits of acquiring an investment linked to any Underlying or any security included in any Underlying or as to the suitability of an investment in the Notes.

You should read this document together with the prospectus dated February 23, 2021, the prospectus supplement dated February 23, 2021 and the Equity Index Underlying Supplement dated February 23, 2021. If the terms of the Notes offered hereby are inconsistent with those described in the accompanying prospectus, prospectus supplement or Equity Index Underlying Supplement, the terms described in this document shall control. You should carefully consider, among other things, the matters set forth in “Risk Factors” beginning on page FWP-9 of this document, page S-1 of the prospectus supplement and page S-1 of the Equity Index Underlying Supplement, as the Notes involve risks not associated with conventional debt securities. We urge you to consult your investment, legal, tax, accounting and other advisors before you invest in the Notes. As used herein, references to the “Issuer”, “HSBC”, “we”, “us” and “our” are to HSBC USA Inc.

HSBC has filed a registration statement (including a prospectus, prospectus supplement and Equity Index Underlying Supplement) with the SEC for the offering to which this document relates. Before you invest, you should read the prospectus, prospectus supplement and Equity Index Underlying Supplement in that registration statement and other documents HSBC has filed with the SEC for more complete information about HSBC and this offering. You may get these documents for free by visiting EDGAR on the SEC’s web site at www.sec.gov. Alternatively, HSBC Securities (USA) Inc. or any dealer participating in this offering will arrange to send you the prospectus, prospectus supplement and Equity Index Underlying Supplement if you request them by calling toll-free 1-866-811-8049.

We are using this document to solicit from you an offer to purchase the Notes. You may revoke your offer to purchase the Notes at any time prior to the time at which we accept your offer by notifying HSBC Securities (USA) Inc. We reserve the right to change the terms of, or reject any offer to purchase, the Notes prior to their issuance. In the event of any material changes to the terms of the Notes, we will notify you.

If the Official Closing Level of each Underlying is at or above its Call Threshold on any Call Observation Date the Notes will be automatically called, and you will receive a cash payment, per $1,000 Principal Amount, equal to the Principal Amount plus the applicable Call Premium on the corresponding Call Payment Date.

If the Notes are called on a Call Observation Date, we will pay the applicable Call Premium on the corresponding Call Payment Date, which will be 4.70% per semi-annual period (or $47.00 for each $1,000 Principal Amount) multiplied by the number of semi-annual periods elapsed from the Trade Date to the applicable Call Observation Date that the Notes are called. See “Call Observation Dates, Call Payment Dates and Call Premiums” on FWP-5 for the applicable Call Premiums to be paid on the corresponding Call Payment Dates. For information regarding the record dates applicable to the Call Premiums payable on the Notes, please see the section entitled “Description of Notes—Interest and Principal Payments—Recipients of Interest Payments” beginning on page S-17 in the accompanying prospectus supplement.

Unless the Notes are called, on the Maturity Date and for each $1,000 Principal Amount, you will receive a cash payment equal to the Final Settlement Value determined as follows:

n If the Reference Return of the Least Performing Underlying is greater than 0.00%

$1,000 + ($1,000 × Reference Return of the Least Performing Underlying× Upside Participation Rate);

n If the Reference Return of the Least Performing Underlying is less than or equal to 0.00%, but greater than or equal to -10.00%:

n If the Reference Return of the Least Performing Underlying is less than -10.00%:

$1,000 + [$1,000 × (Reference Return of the Least Performing Underlying + 10.00%)].

If the Notes are not called and the Final Value of the Least Performing Underlying is less than its Buffer Value, you will receive protection from the first 10.00% of any losses, with 1.00x exposure to each 1% decline that the Reference Return of the Least Performing Underlying is less than -10.00%. Under these circumstances you will not receive the Call Premium and will lose some or a significant portion (up to 90.00%) of the Principal Amount.

We or one of our affiliates will act as calculation agent with respect to the Notes.

The reference sponsor of the SPX is S&P Dow Jones Indices LLC, a division of S&P Global. The reference sponsor of the RTY is FTSE Russell.

The Notes may be suitable for you if:

You believe that the Official Closing Level of each Underlying will be at or above its Call Threshold on one or more of the Call Observation Dates or, if the Notes are not called, that the Final Value of each Underlying will be greater than its Initial Value.

You seek a Call Premium based on the performance of the Underlyings, that will be 4.70% per semi-annual period if the Official Closing Level of each Underlying is greater than or equal to its Initial Value on any Call Observation Date.

You are willing to invest in the Notes based on the fact that your maximum potential return is limited to the applicable Call Premium payable on the Notes on a given Call Payment Date.

You are willing to make an investment that is exposed to the potential downside performance of the Least Performing Underlying, if the Notes are not called, on a 1-to-1 basis for each percentage point that the Reference Return of the Least Performing Underlying is below -10.00%.

You are willing to lose up to 90.00% of the Principal Amount.

You are willing to hold the Notes which will be automatically called on any Call Observation Date on which the Official Closing Level of each Underlying is at or above its Call Threshold, or you are otherwise willing to hold the Notes to maturity.

You are willing to forgo guaranteed interest payments on the Notes, and the dividends or other distributions paid on the stocks included in the Underlyings.

You do not seek an investment for which there will be an active secondary market.

You are willing to accept the risk and return profile of the Notes versus a conventional debt security with a comparable maturity issued by HSBC or another issuer with a similar credit rating.

You are comfortable with the creditworthiness of HSBC, as Issuer of the Notes.

The Notes may not be suitable for you if:

You believe that the Official Closing Level of at least one Underlying will be below its Call Threshold on all of the Call Observation Dates, and the Final Value of the Least Performing Underlying will be below its Buffer Value.

You believe that the Call Premium, if any, will not provide you with your desired return.

You are unwilling to invest in the Notes based on the fact that your maximum potential return is limited to the applicable Call Premium payable on the Notes on a given Call Payment Date.

You are unwilling to make an investment that is exposed to the potential downside performance of the Least Performing Underlying, if the Notes are not called, on a 1-to-1 basis for each percentage point that the Reference Return of the Least Performing Underlying is below -10.00%.

You seek an investment that provides full return of principal at maturity.

You are unable or unwilling to hold Notes that will be automatically called on any Call Observation Date on which the Official Closing Level of each Underlying is at or above its Call Threshold, or you are otherwise unable or unwilling to hold the Notes to maturity.

You prefer to receive guaranteed periodic interest payments on the Notes, or the dividends or other distributions paid on the stocks included in the Underlyings.

You seek an investment for which there will be an active secondary market.

You prefer the lower risk, and therefore accept the potentially lower returns, of conventional debt securities with comparable maturities issued by HSBC or another issuer with a similar credit rating.

You are not willing or are unable to assume the credit risk associated with HSBC, as Issuer of the Notes.

We urge you to read the section “Risk Factors” beginning on page S-1 of the accompanying prospectus supplement and page S-1 of the accompanying Equity Index Underlying Supplement. You should understand the risks of investing in the Notes and should reach an investment decision only after careful consideration, with your advisors, of the suitability of the Notes in light of your particular financial circumstances and the information set forth in this document and the accompanying prospectus, prospectus supplement and Equity Index Underlying Supplement. In addition to the risks discussed below, you should review “Risk Factors” in the accompanying prospectus supplement and Equity Index Underlying Supplement including the explanation of risks relating to the Notes described in the following sections:

You will be subject to significant risks not associated with conventional fixed-rate or floating-rate debt securities.

The Notes do not guarantee any return of principal and you may lose some or a significant portion of your Principal Amount.

The Notes do not guarantee any return of principal. The Notes differ from ordinary debt securities in that we will not pay you 100% of the Principal Amount of your Notes if the Notes are not called and the Final Value of the Least Performing Underlying is less than its Buffer Value. In this case, the Payment at Maturity you will be entitled to receive will be less than the Principal Amount and you will lose 1% for each 1% that the Reference Return of the Least Performing Underlying is less than -10.00%. You may lose some or a significant portion (up to 90.00%) of your investment at maturity.

The Notes may not be called, and in such a case you will not receive the Call Premium. If the Official Closing Level of the Least Performing Underlying on the Final Valuation Date is less than its Buffer Value, we will not pay you the Call Premium at maturity, you will not receive a positive return on the Notes, and you will lose some or all of your principal amount.

Prior to maturity, your return on the Notes is limited to the Principal Amount plus the Call Premium, if any, regardless of any appreciation in the value of any Underlying.

If the Notes are called, for each $1,000 Principal Amount, you will receive $1,000 the plus the applicable Call Premium, regardless of any appreciation in the value of any Underlying, which may be significant. Accordingly, the return on the Notes may be significantly less than the return on a direct investment in the stocks included in the Underlyings during the term of the Notes.

Higher Call Premiums or lower Buffer Values are generally associated with Underlyings with greater expected volatility and therefore can indicate a greater risk of loss.

"Volatility" refers to the frequency and magnitude of changes in the value of an Underlying. The greater the expected volatility with respect to an Underlying on the Trade Date, the higher the expectation as of the Trade Date that the value of that Underlying could close below its Call Threshold on a Call Observation Date or its Buffer Value on the Final Valuation Date, indicating a higher expected risk of non-payment of Call Premiums or loss on the Notes. This greater expected risk will generally be reflected in a higher Call Premium than the yield payable on our conventional debt securities with a similar maturity, or in more favorable terms (such as a lower Buffer Value or a higher Call Premium ) than for similar securities linked to the performance of an Underlying with a lower expected volatility as of the Trade Date. You should therefore understand that a relatively higher Call Premium may indicate an increased risk of loss. Further, a relatively lower Buffer Value may not necessarily indicate that the Notes have a greater likelihood of a repayment of principal at maturity. The volatility of an Underlying can change significantly over the term of the Notes. The value of an Underlying for your Notes could fall sharply, which could result in a significant loss of principal. You should be willing to accept the downside market risk of the Least Performing Underlying, including the potential of not receiving a Call Premium and losing some or all of your principal at maturity.

Since the Notes are linked to the performance of more than one Underlying, you will be fully exposed to the risk of fluctuations in the value of each Underlying.

Since the Notes are linked to the performance of more than one Underlying, the Notes will be linked to the individual performance of each Underlying. Because the Notes are not linked to a basket, in which the risk is mitigated and diversified among all of the components of a basket, you will be exposed to the risk of fluctuations in the value of each Underlying. For example, in the case of notes linked to a basket, the return would depend on the aggregate performance of the basket components reflected as the basket return. Thus, the depreciation of any basket component could be mitigated by the appreciation of another basket component. However, in the case of these Notes, the individual performance of each of the Underlyings would not be combined to calculate your return and the

depreciation of either Underlying would not be mitigated by the appreciation of the other Underlying. Instead, your return would depend on the Least Performing Underlying.

Because the Notes are linked to the performance of the Least Performing Underlying, you are exposed to greater risks of not receiving the Call Premium and sustaining a significant loss on your investment than if the Notes were linked to just one Underlying.

The risk that you will not receive the Call Premium, or that you will suffer a significant loss on your investment, is greater if you invest in the Notes as opposed to substantially similar securities that are linked to the performance of just one Underlying. With multiple Underlyings, it is more likely that one of the Underlyings will close below its respective Call Threshold on any of the Call Observation Dates (including the Final Valuation Date) and below its respective Buffer Value on the Final Valuation Date, than if the Notes were linked to only one Underlying. In addition, because each Underlying must close above its Call Threshold on a Call Observation Date in order for the Notes to be called, the Notes are less likely to be called than if the Notes were linked to just one Underlying. Therefore, it is more likely that you will not receive the Call Premium, and that you will suffer a significant loss on your investment.

If the Notes are not called, your return will be based on the Reference Return of the Least Performing Underlying.

If the Notes are not called, your return will be based on the Reference Return of the Least Performing Underlying without regard to the performance of any other Underlying. As a result, you could lose all or some of your initial investment if the Final Value of the Least Performing Underlying is less than its Buffer Value, even if there is an increase in the value of any other Underlying. This could be the case even if any other Underlying increased by an amount greater than the decrease in the Least Performing Underlying.

The amount payable on the Notes is not linked to the values of the Underlyings at any time other than the Call Observation Dates and the Final Valuation Date.

The payments on the Notes will be based on the Official Closing Levels of the Underlyings on the Call Observation Dates and, if the Notes are not called, the Final Valuation Date, subject to postponement for non-trading days and certain Market Disruption Events. Even if the value of each Underlying is greater than or equal to its Call Threshold during the term of the Notes other than on a Call Observation Date but then decreases on a Call Observation Date to a value that is less than its Call Threshold, the Call Premium will not be payable for the relevant Call Payment Date. Similarly, if the Notes are not called, even if the value of the Least Performing Underlying is greater than or equal to its Buffer Value during the term of the Notes other than on the Final Valuation Date but then decreases on the Final Valuation Date to a value that is less than its Buffer Value, the Payment at Maturity will be less, possibly significantly less, than it would have been had the Payment at Maturity been linked to the value of the Least Performing Underlying prior to such decrease. Although the actual values of the Underlyings on the Maturity Date or at other times during the term of the Notes may be higher than their respective values on the Call Observation Dates or the Final Valuation Date, the Call Premium will be based solely on the Official Closing Levels of the Underlyings on the applicable Call Observation Date, and the Payment at Maturity will be based solely on the Official Closing Levels of the Underlyings on the Final Valuation Date.

Changes that affect an Underlying may affect the value of an Underlying and the market value of the Notes and the amount you will receive on the Notes and the amount you will receive at maturity.

The policies of the reference sponsor of an Underlying concerning additions, deletions and substitutions of the stocks included in an Underlying, and the manner in which the reference sponsor takes account of certain changes affecting those stocks, may affect the value of an Underlying. The policies of the reference sponsor with respect to the calculation of an Underlying could also affect the value of an Underlying. The reference sponsor may discontinue or suspend calculation or dissemination of an Underlying. Any such actions could affect the value of an Underlying and the value of and the return on the Notes.

The RTY tracks companies that are considered small-capitalization. These companies often have greater stock price volatility, lower trading volume and less liquidity than large-capitalization companies and therefore the level of the RTY may be more volatile than an investment in stocks issued by large-capitalization companies. Stock prices of small-capitalization companies are also more vulnerable than those of large-capitalization companies to adverse business and economic developments, and the stocks of small-capitalization companies may be thinly traded, making it difficult for the RTY to track them. In addition, small-capitalization companies are typically less stable financially than large-capitalization companies and may depend on a small number of key personnel, making them more vulnerable to loss of personnel. Small-capitalization companies are often subject to less analyst coverage and may be in early, and less predictable, periods of their corporate existences. Such companies tend to have smaller revenues, less diverse product lines, smaller shares of their product or service markets, fewer financial resources and less competitive strengths than large-capitalization companies and are more susceptible to adverse developments related to their products.

The Notes are senior unsecured debt obligations of the Issuer, HSBC, and are not, either directly or indirectly, an obligation of any third party. As further described in the accompanying prospectus supplement and prospectus, the Notes will rank on par with all of the other unsecured and unsubordinated debt obligations of HSBC, except such obligations as may be preferred by operation of law. Any payment to be made on the Notes, including any return of principal at maturity, depends on the ability of HSBC to satisfy its obligations as they come due. As a result, the actual and perceived creditworthiness of HSBC may affect the market value of the Notes and, in the event HSBC were to default on its obligations, you may not receive the amounts owed to you under the terms of the Notes.

The Notes are not insured or guaranteed by any governmental agency of the United States or any other jurisdiction.

The Notes are not deposit liabilities or other obligations of a bank and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency or program of the United States or any other jurisdiction. An investment in the Notes is subject to the credit risk of HSBC, and in the event that HSBC is unable to pay its obligations as they become due, you may not receive the full payments due on the Notes.

The Estimated Initial Value of the Notes, which will be determined by us on the Trade Date, is expected to be less than the price to public and may differ from the market value of the Notes in the secondary market, if any.

The Estimated Initial Value of the Notes will be calculated by us on the Trade Date and is expected to be less than the price to public. The Estimated Initial Value will reflect our internal funding rate, which is the borrowing rate we pay to issue market-linked securities, as well as the mid-market value of the embedded derivatives in the Notes. This internal funding rate is typically lower than the rate we would use when we issue conventional fixed or floating rate debt securities. As a result of the difference between our internal funding rate and the rate we would use when we issue conventional fixed or floating rate debt securities, the Estimated Initial Value of the Notes may be lower if it were based on the prices at which our fixed or floating rate debt securities trade in the secondary market. In addition, if we were to use the rate we use for our conventional fixed or floating rate debt issuances, we would expect the economic terms of the Notes to be more favorable to you. We will determine the value of the embedded derivatives in the Notes by reference to our or our affiliates’ internal pricing models. These pricing models consider certain assumptions and variables, which can include volatility and interest rates. Different pricing models and assumptions could provide valuations for the Notes that are different from our Estimated Initial Value. These pricing models rely in part on certain forecasts about future events, which may prove to be incorrect. The Estimated Initial Value does not represent a minimum price at which we or any of our affiliates would be willing to purchase your Notes in the secondary market (if any exists) at any time.

The price of your Notes in the secondary market, if any, immediately after the Trade Date is expected to be less than the price to public.

The price to public takes into account certain costs. These costs, which will be used or retained by us or one of our affiliates, include the underwriting discount, our affiliates’ projected hedging profits (which may or may not be realized) for assuming risks inherent in hedging our obligations under the Notes, and the costs associated with structuring and hedging our obligations under the Notes. If you were to sell your Notes in the secondary market, if any, the price you would receive for your Notes may be less than the price you paid for them because secondary market prices will not take into account these costs. The price of your Notes in the secondary market, if any, at any time after issuance will vary based on many factors, including the values of the Underlyings and changes in market conditions, and cannot be predicted with accuracy. The Notes are not designed to be short-term trading instruments, and you should, therefore, be able and willing to hold the Notes to maturity. Any sale of the Notes prior to maturity could result in a loss to you.

If we were to repurchase your Notes immediately after the Original Issue Date, the price you receive may be higher than the Estimated Initial Value of the Notes.

Assuming that all relevant factors remain constant after the Original Issue Date, the price at which HSBC Securities (USA) Inc. may initially buy or sell the Notes in the secondary market, if any, and the value that may initially be used for customer account statements, if any, may exceed the Estimated Initial Value on the Trade Date for a temporary period expected to be approximately 6 months after the Original Issue Date. This temporary price difference may exist because, in our discretion, we may elect to effectively reimburse to investors a portion of the estimated cost of hedging our obligations under the Notes and other costs in connection with the Notes that we will no longer expect to incur over the term of the Notes. We will make such discretionary election and determine this temporary reimbursement period on the basis of a number of factors, including the tenor of the Notes and any agreement we may have with the distributors of the Notes. The amount of our estimated costs which we effectively reimburse to investors in this way may not be allocated ratably throughout the reimbursement period, and we may discontinue such reimbursement at any time or revise the duration of the reimbursement period after the Original Issue Date of the Notes based on changes in market conditions and other factors that cannot be predicted.

You will not have any ownership interest in the stocks included in an Underlying.

As a holder of the Notes, you will not have any ownership interest in the stocks included in an Underlying, such as rights to vote, dividend payments or other distributions. Because the return on the Notes will not reflect any dividends on those stocks, the Notes may underperform an investment in the stocks included in an Underlying.

The Notes will not be listed on any securities exchange or automated quotation system. HSBC Securities (USA) Inc. is not required to offer to purchase the Notes in the secondary market, if any exists. Even if there is a secondary market, it may not provide enough liquidity to allow you to trade or sell the Notes easily. Because other dealers are not likely to make a secondary market for the Notes, the price at which you may be able to trade your Notes is likely to depend on the price, if any, at which HSBC Securities (USA) Inc. is willing to buy the Notes.

An affiliate of HSBC has a minority equity interest in the owner of an electronic platform, through which we may make available certain structured investments offering materials. HSBC and its affiliates play a variety of roles in connection with the issuance of the Notes, including acting as calculation agent and hedging our obligations under the Notes. In performing these duties, the economic interests of the calculation agent and other affiliates of ours are potentially adverse to your interests as an investor in the Notes. We will not have any obligation to consider your interests as a holder of the Notes in taking any action that might affect the value of your Notes.

For a discussion of the U.S. federal income tax consequences of your investment in a Note, please see the discussion under “U.S. Federal Income Tax Considerations” herein and the discussion under “U.S. Federal Income Tax Considerations” in the accompanying prospectus supplement.

The following table and examples are provided for illustrative purposes only and are hypothetical. They do not purport to be representative of every possible scenario concerning increases or decreases in the value of any Underlying relative to its Initial Value. We cannot predict the Official Closing Level of an Underlying on any Call Observation Date, including the Final Valuation Date. The assumptions we have made in connection with the illustrations set forth below may not reflect actual events. You should not take this illustration or these examples as an indication or assurance of the expected performance of the Underlyings or the return on the Notes.

The table and examples below illustrate how the Call Premium and the Payment at Maturity would be calculated with respect to a $1,000 investment in the Notes, given a range of hypothetical performances of any Underlying. The hypothetical returns on the Notes below are numbers, expressed as percentages, that result from comparing the Payment at Maturity per $1,000 Principal Amount to $1,000. The numbers appearing in the following table and examples may have been rounded for ease of analysis. The following table and examples assume the following:

* The hypothetical Initial Value of 1,000.00 used in the examples below has been chosen for illustrative purposes only and does not represent the actual Initial Value of any Underlying. The actual Initial Value of each Underlying will be determined on the Pricing Date and set forth in the final pricing supplement to which this free writing prospectus relates.

Example 1—The Official Closing Level of each Underlying on the first Call Observation Date is greater than or equal to its Call Threshold.

Because the Official Closing Level of each Underlying on the first Call Observation Date is at or above its Call Threshold, the Notes will be called and you will receive $1,094.00 per Note, reflecting the Principal Amount plus the applicable Call Premium, resulting in a 9.40% return on the Notes. No extra payment will be made on account of each Underlying closing above its respective Initial Value.

Example 2—The Notes are not called and Official Closing Level of each Underlying on the Final Valuation Date is greater than zero.

Because the Notes are not called and the Official Closing Level of each Underlying on the Final Valuation Date is above its Initial Value and you will receive $1,100.00 per Note, reflecting the positive return of the Least Performing Underlying multiplied by the Upside Participation Rate, resulting in a 10.00% return on the Notes, calculated as follows:

Example 3— The Notes are not called and the Final Value of the Least Performing Underlying is less or equal to its Initial Value but greater than or equal to its Buffer Value.

Because the Final Value of the Least Performing Underlying is less than or equal to its Initial Value but greater than or equal to the Buffer Value, you will receive $1,000.00 per Note, reflecting the Principal Amount, resulting in a 0.00% return on the Notes, even though the value of the Least Performing Underlying has declined.

Example 4—The Notes are not called, and the Final Value of the Least Performing Underlying is less than its Buffer Value.

Because the Final Value of the Least Performing Underlying is less than its Buffer Value, you will receive $770.00 per $1,000 Principal Amount, calculated as follows:

Final Settlement Value = $1,000 + [$1,000 × (Reference Return of the Least Performing Underlying + 10.00%)]

You will not receive a Call Premium, resulting in a -23.00% return on the Notes.

If the Notes are not called and the Final Value of the Least Performing Underlying is less than its Buffer Value, you will be exposed to any decrease in the value of the Least Performing Underlying below its Buffer Value on a 1:1 basis and could lose some or a significant portion (up to 90.00%) of your principal at maturity.

If the Notes have become immediately due and payable following an Event of Default (as defined in the accompanying prospectus) with respect to the Notes, the calculation agent will determine the accelerated payment due and payable in the same general manner as described in this document except that in such a case, the scheduled trading day immediately preceding the date of acceleration will be used as the Final Valuation Date for purposes of determining the Reference Return of an Underlying, and the accelerated Maturity Date will be three business days after the accelerated Final Valuation Date. If a Market Disruption Event exists with respect to an Underlying on that scheduled trading day, then the accelerated Final Valuation Date for that Underlying will be postponed for up to five scheduled trading days (in the same manner used for postponing the originally scheduled Final Valuation Date). The accelerated Maturity Date will also be postponed by an equal number of business days following the postponed accelerated Final Valuation Date. For the avoidance of doubt, if no Market Disruption Event exists with respect to an Underlying on the scheduled trading day preceding the date of acceleration, the determination of such Underlying’s Final Value will be made on such date, irrespective of the existence of a Market Disruption Event with respect to any other Underlying occurring on such date.

If the Notes have become immediately due and payable following an Event of Default, you will not be entitled to any additional payments with respect to the Notes. For more information, see “Description of Debt Securities — Senior Debt Securities — Events of Default” in the accompanying prospectus.

We have appointed HSBC Securities (USA) Inc., an affiliate of HSBC, as the agent for the sale of the Notes. Pursuant to the terms of a distribution agreement, HSBC Securities (USA) Inc. will purchase the Notes from HSBC at the price to public less the underwriting discount set forth on the cover page of the pricing supplement to which this free writing prospectus relates, for distribution to other registered broker-dealers or will offer the Notes directly to investors. HSBC Securities (USA) Inc. proposes to offer the Notes at the price to public set forth on the cover page of this document. HSBC USA Inc. or one of our affiliates may pay varying underwriting discounts of up to 0.50% per $1,000 Principal Amount in connection with the distribution of the Notes to other registered broker-dealers.

An affiliate of HSBC has paid or may pay in the future an amount to broker-dealers in connection with the costs of the continuing implementation of systems to support the Notes.

In addition, HSBC Securities (USA) Inc. or another of its affiliates or agents may use the pricing supplement to which this free writing prospectus relates in market-making transactions after the initial sale of the Notes, but is under no obligation to make a market in the Notes and may discontinue any market-making activities at any time without notice.

See “Supplemental Plan of Distribution (Conflicts of Interest)” on page S-83 in the prospectus supplement.

We expect that delivery of the Notes will be made against payment for the Notes on or about the Original Issue Date set forth on the inside cover page of this document, which is more than two business days following the Trade Date. Under Rule 15c6-1 under the Securities Exchange Act of 1934, trades in the secondary market generally are required to settle in two business days, unless the parties to that trade expressly agree otherwise. Accordingly, purchasers who wish to trade the Notes more than two business days prior to the Original Issue Date will be required to specify an alternate settlement cycle at the time of any such trade to prevent a failed settlement, and should consult their own advisors.

There is no direct legal authority as to the proper tax treatment of the Notes, and therefore significant aspects of the tax treatment of the Notes are uncertain as to both the timing and character of any inclusion in income in respect of the Notes. Under one approach, a Note should be treated as a pre-paid executory contract with respect to the Underlyings. We intend to treat the Notes consistent with this approach. Pursuant to the terms of the Notes, you agree to treat the Notes under this approach for all U.S. federal income tax purposes. Subject to the limitations described therein, and based on certain factual representations received from us, in the opinion of our special U.S. tax counsel, Mayer Brown LLP, it is reasonable to treat a Note as a pre-paid executory contract with respect to the Underlyings. Pursuant to this approach, we do not intend to report any income or gain with respect to the Notes prior to their maturity or an earlier sale, call or exchange and we intend to treat any gain or loss upon maturity or an earlier sale, call or exchange as long-term capital gain or loss, provided you have held the Note for more than one year at such time for U.S. federal income tax purposes. If the Notes are held by the same United States holder until maturity, that holder’s holding period will generally include the maturity date.

We will not attempt to ascertain whether any of the entities whose stock is included in the Underlyings would be treated as a passive foreign investment company (“PFIC”) or United States real property holding corporation (“USRPHC”), both as defined for U.S. federal income tax purposes. If one or more of the entities whose stock is included in the Underlyings were so treated, certain adverse U.S. federal income tax consequences might apply. You should refer to information filed with the SEC and other authorities by the entities whose stock is included in the Underlyings and consult your tax advisor regarding the possible consequences to you if one or more of the entities whose stock is included in the Underlyings is or becomes a PFIC or a USRPHC.

Under current law, while the matter is not entirely clear, individual non-U.S. holders, and entities whose property is potentially includible in those individuals’ gross estates for U.S. federal estate tax purposes (for example, a trust funded by such an individual and with respect to which the individual has retained certain interests or powers), should note that, absent an applicable treaty benefit, the Notes are likely to be treated as U.S. situs property, subject to U.S. federal estate tax. These individuals and entities should consult their own tax advisors regarding the U.S. federal estate tax consequences of investing in the Notes.

A “dividend equivalent” payment is treated as a dividend from sources within the United States and such payments generally would be subject to a 30% U.S. withholding tax if paid to a non-U.S. holder. Under U.S. Treasury Department regulations, payments (including deemed payments) with respect to equity-linked instruments (“ELIs”) that are “specified ELIs” may be treated as dividend equivalents if such specified ELIs reference an interest in an “underlying security,” which is generally any interest in an entity taxable as a corporation for U.S. federal income tax purposes if a payment with respect to such interest could give rise to a U.S. source dividend. However, Internal Revenue Service guidance provides that withholding on dividend equivalent payments will not apply to specified ELIs that are not delta-one instruments and that are issued before January 1, 2023. Based on the Issuer’s determination that the Notes are not “delta-one” instruments, non-U.S. holders should not be subject to withholding on dividend equivalent payments, if any, under the Notes. However, it is possible that the Notes could be treated as deemed reissued for U.S. federal income tax purposes upon the occurrence of certain events affecting an Underlying or the Notes, and following such occurrence the Notes could be treated as subject to withholding on dividend equivalent payments. Non-U.S. holders that enter, or have entered, into other transactions in respect of an Underlying or the Notes should consult their tax advisors as to the application of the dividend equivalent withholding tax in the context of the Notes and their other transactions. If any payments are treated as dividend equivalents subject to withholding, we (or the applicable paying agent) would be entitled to withhold taxes without being required to pay any additional amounts with respect to amounts so withheld.

For a discussion of the U.S. federal income tax consequences of your investment in a Note, please see the discussion under “U.S Federal Income Tax Considerations” in the accompanying prospectus supplement.

PROSPECTIVE PURCHASERS OF NOTES SHOULD CONSULT THEIR TAX ADVISORS AS TO THE FEDERAL, STATE, LOCAL, AND OTHER TAX CONSEQUENCES TO THEM OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF NOTES.

	Price to Public	Underwriting Discount¹	Proceeds to Issuer
Per Note	$1,000
Total

Information about the Reference Asset

The SPX is a capitalization-weighted index of 500 U.S. stocks. It is designed to measure performance of the broad domestic economy through changes in the aggregate market value of 500 stocks representing all major industries.

		The RTY is designed to track the performance of the small capitalization segment of the United States equity market. All 2,000 stocks are traded on the New York Stock Exchange or Nasdaq, and the RTY consists of the smallest 2,000 companies included in the Russell 3000^® Index. The Russell 3000^® Index is composed of the 3,000 largest United States companies as determined by market capitalization and represents approximately 98% of the United States equity market.

The graphs above illustrate the performance of the Underlyings from May 12, 2011 through May 12, 2021. The closing values underlying the graphs above were obtained from the Bloomberg Professional^® Service. Past performance is not necessarily an indication of future results. For further information on the Reference Asset please see “Description of the Reference Asset” beginning on page FWP-16 of this document. We have derived all disclosure regarding the Reference Asset from publicly available information. Neither HSBC USA Inc. nor any of its affiliates have undertaken any independent review of, or made any due diligence inquiry with respect to, the publicly available information about the Reference Asset.

Issuer:	HSBC USA Inc.
Principal Amount:	$1,000 per Note
Reference Asset:	The S&P 500^® Index (Ticker: SPX) and the Russell 2000^® Index (Ticker: RTY) (each an “Underlying” and together the “Underlyings”)
Trade Date:	May 21, 2021
Pricing Date:	May 21, 2021
Original Issue Date:	May 26, 2021
Final Valuation Date:	May 20, 2026, subject to adjustment as described under “Additional Terms of the Notes―Valuation Dates” in the accompanying Equity Index Underlying Supplement.
Maturity Date:	3 business days after the Final Valuation Date, expected to be May 26, 2026. The Maturity Date is subject to adjustment as described under “Additional Terms of the Notes―Coupon Payment Dates, Call Payment Dates and Maturity Date” in the accompanying Equity Index Underlying Supplement.
Call Feature:	If the Official Closing Level of each Underlying is at or above its Call Threshold on any Call Observation Date the Notes will be automatically called, and you will receive a cash payment, per $1,000 Principal Amount, equal to the Principal Amount plus the applicable Call Premium on the corresponding Call Payment Date.
Payment at Maturity:	Unless the Notes are called, on the Maturity Date, for each $1,000 Principal Amount, we will pay you the Final Settlement Value.
Final Settlement Value:	Unless the Notes are called, for each $1,000 Principal Amount, you will receive a cash payment on the Maturity Date, calculated as follows: n If the Reference Return of the Least Performing Underlying is greater than 0.00% $1,000 + ($1,000 × Reference Return of the Least Performing Underlying× Upside Participation Rate); n If the Reference Return of the Least Performing Underlying is less than or equal to 0.00%, but greater than or equal to -10.00%: $1,000 (a zero return) n If the Reference Return of the Least Performing Underlying is less than -10.00%: $1,000 + [$1,000 × (Reference Return of the Least Performing Underlying + 10.00%)]. If the Notes are not called and the Final Value of the Least Performing Underlying is less than its Buffer Value, you will receive protection from the first 10.00% of any losses, with 1.00x exposure to each 1% decline that the Reference Return of the Least Performing Underlying is less than -10.00%. Under these circumstances you will lose some or a significant portion (up to 90.00%) of the Principal Amount.
Least Performing Underlying:	The Underlying with the lowest Reference Return.
Reference Return:	With respect to each Underlying, the quotient, expressed as a percentage, calculated as follows: Final Value – Initial Value Initial Value

Call Observation Dates, Call Payment Dates, Call Premiums and Call Threshold:	Call Observation Dates	Call Payment Dates	Call Premium	Call Threshold for each Underlying
	May 23, 2022	May 26, 2022	9.40%	100.00% of its Initial Value
	November 22, 2022	November 28, 2022	14.10%	100.00% of its Initial Value
	May 23, 2023	May 26, 2023	18.80%	100.00% of its Initial Value
	November 21, 2023	November 27, 2023	23.50%	100.00% of its Initial Value
	May 22, 2024	May 28, 2024	28.20%	100.00% of its Initial Value
	November 21, 2024	November 26, 2024	32.90%	100.00% of its Initial Value
	May 21, 2025	May 27, 2025	37.60%	100.00% of its Initial Value
	November 21, 2025	November 26, 2025	42.30%	100.00% of its Initial Value
	The Call Observation Dates and Call Payment Dates are subject to postponement as described under “Additional Terms of the Notes—Valuation Dates” and “Additional Terms of the Notes—Coupon Payment Dates, Call Payment Dates and Maturity Date” in the accompanying Equity Index Underlying Supplement.
Upside Participation Rate:	If the Notes are not called, 100% (1.00x) exposure to any positive Reference Return of the Least Performing Underlying
Initial Value:	With respect to each Underlying, its Official Closing Level on the Pricing Date.
Final Value:	With respect to each Underlying, its Official Closing Level on the Final Valuation Date.
Buffer Value:	With respect to each Underlying, 90.00% of its Initial Value.
CUSIP/ISIN:	40438JAV7/US40439JAV70
Form of Notes:	Book-Entry
Listing:	The Notes will not be listed on any securities exchange or quotation system.
Estimated Initial Value:	The Estimated Initial Value of the Notes is expected to be less than the price you pay to purchase the Notes. The Estimated Initial Value does not represent a minimum price at which we or any of our affiliates would be willing to purchase your Notes in the secondary market, if any, at any time. The Estimated Initial Value will be calculated on the Trade Date and will be set forth in the pricing supplement to which this free writing prospectus relates. See “Risk Factors — The Estimated Initial Value of the Notes, which will be determined by us on the Trade Date, is expected to be less than the price to public and may differ from the market value of the Notes in the secondary market, if any.”

4 Principal Amount:	$1,000
4 Hypothetical Initial Value	1,000.00*
4 Hypothetical Call Threshold	For each Underlying on a Call Observation Date, the relevant percentage of the Initial Value of such Underlying applicable on such Call Observation Date as described on page FWP-5 under “Call Observation Dates, Call Payment Dates, Call Premiums and Call Thresholds.”
4 Hypothetical Buffer Value:	900.00 (90.00% of the Initial Value)
4 Hypothetical Call Premium:	4.70% per semi-annual period (or $47.00 for each $1,000 Principal Amount) multiplied by the number of semi-annual periods elapsed from the Trade Date to the applicable Call Observation Date that the Notes are called. See “Call Observation Dates, Call Payment Dates and Call Premiums” on FWP-5.

Illustration of Payment Scenarios

Your payment on the Notes will depend on whether the Notes have been called. If the Notes are not called on the final Call Observation Date, your payment on the Notes will depend whether the Final Value of the Least Performing Underlying on the Final Valuation Date is greater than its Initial Value and subject to the Upside Participation Rate, is less than its Initial Value but greater than or equal to its Buffer Value, or is less than its Buffer Value.

4	“—Risks Relating to All Note Issuances” in the prospectus supplement; and

	Notes Are Called on a Call Observation Date		Notes Are Not Called on any Call Observation Date
	Example 1	Example 2	Example 3	Example 4
Initial Value of each Underlying	1,000.00	1,000.00	1,000.00	1,000.00
Call Threshold of each Underlying	1,000.00	1,000.00	1,000.00	1,000.00
Buffer Value of each Underlying	900.00	900.00	900.00	900.00
Call Observation Dates	Official Closing Level / Percentage Change of the Least Performing Underlying
1^st Call Observation Date	1,200.00 / 20.00% Call Premium: $94.00	910.00/ -9.00% Call Premium: $0.00	910.00/ -9.00% Call Premium: $0.00	810.00 / -19.00% Call Premium: $0.00
2^nd Call Observation Date to 8^th Call Observation Date	N/A	Official Closing Level is below the Call Threshold Call Premium: $0.00	Official Closing Level is below the Call Threshold Call Premium: $0.00	Official Closing Level is below the Call Threshold Call Premium: $0.00
Final Valuation Date	N/A	1,100.00 / 10.00%	930.00 / -7.00%	670.00 / -33.00%
Payment if Notes are Called prior to Maturity	$1,094.00	N/A	N/A	N/A
Payment at Maturity	N/A	$1,000 + (1,000 x 10.00% x 100%) =$1,100.00	$1,000.00	$1,000 + ($1,000 x -33.00%+ 10.00%) = $770.00
Return of the Notes	9.40%	10.00%	0.00%	-23.00%

Underlying	Initial Value	Official Closing Level
SPX	1,000.00	1,250.00 (125.00% of Initial Value)
RTY	1,000.00	1,200.00 (120.00% of Initial Value)

Underlying	Initial Value	Final Value
SPX	1,000.00	1,250.00 (125.00% of Initial Value)
RTY	1,000.00	1,100.00 (110.00% of Initial Value)


Reference Return of the Least Performing Underlying:	-7.00%
Payment at Maturity:	$1,000.00


Reference Return of the Least Performing Underlying:	-33.00%
Payment at Maturity:	$770.00

TABLE OF CONTENTS		You should only rely on the information contained in this document, the accompanying Equity Index Underlying Supplement, prospectus supplement and prospectus. We have not authorized anyone to provide you with information or to make any representation to you that is not contained in this document, the accompanying Equity Index Underlying Supplement, prospectus supplement and prospectus. If anyone provides you with different or inconsistent information, you should not rely on it. This document, the accompanying Equity Index Underlying Supplement, prospectus supplement and prospectus are not an offer to sell these Notes, and these documents are not soliciting an offer to buy these Notes, in any jurisdiction where the offer or sale is not permitted. You should not, under any circumstances, assume that the information in this document, the accompanying Equity Index Underlying Supplement, prospectus supplement and prospectus is correct on any date after their respective dates. HSBC USA Inc. $ Autocallable Buffered Notes with Step-up Premium and Upside Participation Linked to the Least Performing of the S&P 500^®Index, and the Russell 2000^® Index May 14, 2021 Free Writing Prospectus
Free Writing Prospectus
General	FWP-6
Payment on the Notes	FWP-7
Investor Suitability	FWP-8
Risk Factors	FWP-9
Illustrative Examples	FWP-13
Description of the Reference Asset	FWP-16
Events of Default and Acceleration	FWP-17
Supplemental Plan of Distribution (Conflicts of Interest)	FWP-17
U.S. Federal Income Tax Considerations	FWP-18
Equity Index Underlying Supplement
Disclaimer	ii
Risk Factors	S-1
The DAX^® Index	S-8
The Dow Jones Industrial Average^®	S-10
The EURO STOXX 50^® Index	S-12
The EURO STOXX^® Banks Index	S-14
The FTSE^® 100 Index	S-16
The Hang Seng^® Index	S-17
The Hang Seng China Enterprises Index	S-19
The KOSPI 200 Index	S-22
The MSCI Indices	S-24
The NASDAQ 100 Index^®	S-31
The Nikkei Stock Average	S-34
The NYSE^® FANG+™ Index	S-36
The PHLX Housing Sector Index	S-41
The Russell 2000^® Index	S-45
The S&P 100^® Index	S-48
The S&P 500^® Index	S-55
The S&P 500^® Low Volatility Index	S-62
The S&P BRIC 40 Index	S-65
The S&P MidCap 400^® Index	S-68
The S&P/ASX 200 Index	S-75
The S&P 500^® ESG Index	S-78
The TOPIX^® Index	S-82
The Swiss Market Index	S-84
Additional Terms of the Notes	S-86
Prospectus Supplement
Risk Factors	S-1
Pricing Supplement	S-12
Description of Notes	S-14
Use of Proceeds and Hedging	S-55
Certain ERISA and Related Considerations	S-56
U.S. Federal Income Tax Considerations	S-58
Supplemental Plan of Distribution (Conflicts of Interest)	S-83
Prospectus
About this Prospectus	1
Risk Factors	2
Where You Can Find More Information	3
Special Note Regarding Forward-Looking Statements	4
HSBC USA Inc.	7
Use of Proceeds	8
Description of Debt Securities	9
Description of Preferred Stock	20
Description of Warrants	25
Description of Purchase Contracts	30
Description of Units	33
Book-Entry Procedures	35
Limitations on Issuances in Bearer Form	39
U.S. Federal Income Tax Considerations Relating to Debt Securities	40
Certain European Union Tax Considerations	48
Plan of Distribution (Conflicts of Interest)	49
Notice to Canadian Investors	52
Notice to EEA Investors	53
Notice to UK Investors	54
UK Financial Promotion	54
Certain ERISA and Related Matters	55
Legal Opinions	57
Experts	58