Subject to Completion Preliminary Term Sheet dated May 20, 2019 Filed Pursuant to Rule 433
 Registration Statement No. 333-223208
(To Prospectus dated February 26, 2018,
Prospectus Supplement dated February 26, 2018 and
Product Supplement EQUITY INDICES SUN-1 dated February 26, 2018)

Units $10 principal amount per unit CUSIP No. Pricing Date* Settlement Date* Maturity Date* May  , 2019 June  , 2019 May  , 2025

*Subject to change based on the actual date the notes are priced for initial sale to the public (the “pricing date”)

Autocallable Market-Linked Step Up Notes Linked to the S&P 500^® Index

§ Maturity of approximately six years, if not called prior to maturity

§ Automatic call of the notes per unit at $10 plus the applicable Call Premium ([$0.55 to $0.65] on the first Observation Date, [$1.10 to $1.30] on the second Observation Date, [$1.65 to $1.95] on the third Observation Date, [$2.20 to $2.60] on the fourth Observation Date and [$2.75 to $3.25] on the final Observation Date) if the Index is flat or increases above 100% of the Starting Value on the relevant Observation Date

§ The Observation Dates will occur approximately one year, two years, three years, four years and five years after the pricing date

§ If the notes are not called, at maturity:

§ a return of 30% if the Index is flat or increases up to the Step Up Value

§ a return equal to the percentage increase in the Index if the Index increases above the Step Up Value

§ 1-to-1 downside exposure to decreases in the Index beyond a 15% decline, with up to 85% of the principal amount at risk

§ All payments are subject to the credit risk of HSBC USA Inc.

§ No interest payments

§ In addition to the underwriting discount set forth below, the notes include a hedging-related charge of $0.075 per unit. See “Supplement to the Plan of Distribution— Role of MLPF&S and BofAS”

§ No listing on any securities exchange

The notes are being issued by HSBC USA Inc. (“HSBC”). Investing in the notes involves a number of risks. There are important differences between the notes and a conventional debt security, including different investment risks and costs. See “Risk Factors” beginning on page TS-7 of this term sheet and beginning on page PS-7 of product supplement EQUITY INDICES SUN-1.

The estimated initial value of the notes on the pricing date is expected to be between $9.40 and $9.80 per unit, which will be less than the public offering price listed below. The market value of the notes at any time will reflect many factors and cannot be predicted with accuracy. See “Summary” on page TS-2 and “Risk Factors” beginning on page TS-7 of this term sheet for additional information.

Neither the 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 product supplement, prospectus or prospectus supplement. Any representation to the contrary is a criminal offense.

	Per Unit	Total
Public offering price(1)	$  10.00	$
Underwriting discount(1)	$    0.20	$
Proceeds, before expenses, to HSBC	$    9.80	$

(1) For any purchase of 500,000 units or more in a single transaction by an individual investor or in combined transactions with the investor’s household in this offering, the public offering price and the underwriting discount will be $9.95 per unit and $0.15 per unit, respectively. See “Supplement to the Plan of Distribution” below.

The notes:

Are Not FDIC Insured Are Not Bank Guaranteed May Lose Value

BofA Merrill Lynch

May  , 2019

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

Summary

The Autocallable Market-Linked Step Up Notes Linked to the S&P 500^® Index, due May , 2025 (the “notes”) are our senior unsecured debt securities and are not a direct or indirect obligation of any third party. The notes are not deposit liabilities or other obligations of a bank and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other governmental agency of the United States or any other jurisdiction. The notes will rank equally with all of our other senior unsecured debt. Any payments due on the notes, including any repayment of principal, depend on the credit risk of HSBC and its ability to satisfy its obligations as they come due. The notes will be automatically called at the applicable Call Amount if the Observation Level of the Market Measure, which is the S&P 500^® Index (the “Index”), is equal to or greater than the Call Level on the relevant Observation Date. If the notes are not called, at maturity, the notes provide you with a Step Up Payment if the Ending Value of the Index is equal to or greater than the Starting Value, but is not greater than the Step Up Value. If the Ending Value is greater than the Step Up Value, you will participate on a 1-for-1 basis in the increase in the level of the Index above the Starting Value. If the Ending Value is less than the Starting Value but greater than or equal to the Threshold Value, you will receive the principal amount of your notes. If the Ending Value is less than the Threshold Value, you will lose a portion, which could be significant, of the principal amount of your notes. Any payments on the notes will be calculated based on the $10 principal amount per unit and will depend on the performance of the Index, subject to our credit risk. See “Terms of the Notes” below.

The estimated initial value of the notes will be less than the price you pay to purchase the notes. The estimated initial value is determined by reference to our or our affiliates’ internal pricing models and reflects our internal funding rate, which is the borrowing rate we pay to issue market-linked notes, and the market prices for hedging arrangements related to the notes (which may include call options, put options or other derivatives). This internal funding rate is typically lower than the rate we would use when we issue conventional fixed or floating rate debt securities. The difference in the borrowing rate, as well as the underwriting discount and the costs associated with hedging the notes, including the hedging related charge described below, will reduce the economic terms of the notes (including the Call Premiums and Call Amounts). The notes are subject to an automatic call, and the initial estimated value is based on an assumed tenor of the notes. The estimated initial value will be calculated on the pricing date and will be set forth in the pricing supplement to which this term sheet relates.

Terms of the Notes
Issuer:	HSBC USA Inc. (“HSBC”)	Call Settlement Dates:	Approximately the fifth business day following the applicable Observation Date, subject to postponement if the related Observation Date is postponed, as described on page PS-20 of product supplement EQUITY INDICES SUN-1.
Principal Amount:	$10.00 per unit	Call Premiums:	[$0.55 to $0.65] per unit if called on the first Observation Date (which represents a return of [5.50% to 6.50%] over the principal amount), [$1.10 to $1.30] per unit if called on the second Observation Date (which represents a return of [11.00% to 13.00%] over the principal amount), [$1.65 to $1.95] per unit if called on the third Observation Date (which represents a return of [16.50% to 19.50%] over the principal amount), [$2.20 to $2.60] per unit if called on the fourth Observation Date (which represents a return of [22.00% to 26.00%] over the principal amount) and [$2.75 to $3.25] per unit if called on the final Observation Date (which represents a return of [27.50% to 32.50%] over the principal amount). The actual Call Premiums will be determined on the pricing date.
Term:	Approximately six years, if not called	Ending Value:	The closing level of the Index on the calculation day. The scheduled calculation day is subject to postponement in the event of Market Disruption Events, as described beginning on page PS-21 of product supplement EQUITY INDICES SUN-1.
Market Measure:	The S&P 500® Index (Bloomberg symbol: “SPX”), a price return index	Step Up Value:	130% of the Starting Value, rounded to two decimal places.
Starting Value:	The closing level of the Index on the pricing date	Step Up Payment:	$3.00 per unit, which represents a return of 30% over the principal amount.
Observation Level:	The closing level of the Index on the applicable Observation Date.	Threshold Value:	85% of the Starting Value, rounded to two decimal places.
Observation Dates:	On or about June , 2020, May , 2021, May , 2022, May , 2023 and May , 2024, subject to postponement in the event of Market Disruption Events, as described on page PS-20 of product supplement EQUITY INDICES SUN-1.	Calculation Day:	Approximately the fifth scheduled Market Measure Business Day immediately preceding the maturity date.
Call Level:	100% of the Starting Value	Fees Charged:	The public offering price of the notes includes the underwriting discount of $0.20 per unit as listed on the cover page and an additional charge of $0.075 per unit more fully described on page TS-12.
Call Amounts (per Unit):	[$10.55 to $10.65] if called on the first Observation Date, [$11.10 to $11.30] if called on the second Observation Date, [$11.65 to $11.95] if called on the third Observation Date, [$12.20 to $12.60] if called on the fourth Observation Date and [$12.75 to $13.25] if called on the final Observation Date. The actual Call Amounts will be determined on the pricing date.	Calculation Agent:	BofA Securities, Inc. (“BofAS”) and HSBC, acting jointly.

Autocallable Market-Linked Step Up Notes TS-2

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

Determining Payment on the Notes

Automatic Call Provision

The notes will be called automatically on an Observation Date if the Observation Level on that Observation Date is equal to or greater than the Call Level. If the notes are called, you will receive $10 per unit plus the applicable Call Premium.

Redemption Amount Determination

If the notes are not automatically called, on the maturity date, you will receive a cash payment per unit determined as follows:

Autocallable Market-Linked Step Up Notes TS-3

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

The terms and risks of the notes are contained in this term sheet and the documents listed below (together, the “Note Prospectus”). The documents have been filed as part of a registration statement with the SEC, which may, without cost, be accessed on the SEC website as indicated below or obtained from MLPF&S or BofAS by calling 1-800-294-1322:

§ Product supplement EQUITY INDICES SUN-1 dated February 26, 2018:
https://www.sec.gov/Archives/edgar/data/83246/000114420418010874/tv487066_424b2.htm

§ Prospectus supplement dated February 26, 2018:
https://www.sec.gov/Archives/edgar/data/83246/000114420418010762/tv486944_424b2.htm

§ Prospectus dated February 26, 2018:
https://www.sec.gov/Archives/edgar/data/83246/000114420418010720/tv487083_424b3.htm

References to Merrill Lynch, Pierce, Fenner & Smith Incorporated (“MLPF&S”) in the accompanying product supplement EQUITY INDICES SUN-1, prospectus supplement and prospectus, as such references relate to MLPF&S’s institutional services should be read as references to BofAS.

Our Central Index Key, or CIK, on the SEC website is 83246. Before you invest, you should read the Note Prospectus, including this term sheet, for information about us and this offering. Any prior or contemporaneous oral statements and any other written materials you may have received are superseded by the Note Prospectus. You should carefully consider, among other things, the matters set forth under “Risk Factors” in the section indicated on the cover of this term sheet. The notes involve risks not associated with conventional debt securities. Capitalized terms used but not defined in this term sheet have the meanings set forth in product supplement EQUITY INDICES SUN-1. Unless otherwise indicated or unless the context requires otherwise, all references in this document to “we,” “us,” “our,” or similar references are to HSBC.

Investor Considerations

You may wish to consider an investment in the notes if:

The notes may not be an appropriate investment for you if:

§You are willing to receive a return on your investment capped at the return represented by the applicable Call Premium if the relevant Observation Level is equal to or greater than the Call Level. §You anticipate that the notes will be automatically called or that the Index will not decrease from the Starting Value to the Ending Value. §You are willing to risk a loss of principal and return if the notes are not automatically called and the Index decreases from the Starting Value to an Ending Value that is below the Threshold Value. §You are willing to forgo the interest payments that are paid on traditional interest bearing debt securities. §You are willing to forgo dividends or other benefits of owning the stocks included in the Index. §You are willing to accept that a secondary market is not expected to develop for the notes, and understand that the market prices for the notes, if any, may be less than the principal amount and will be affected by various factors, including our actual and perceived creditworthiness, our internal funding rate and the fees charged, as described on page TS-2. §You are willing to assume our credit risk, as issuer of the notes, for all payments under the notes, including the Call Amount or the Redemption Amount.

§You want to hold your notes for the full term. §You believe that the notes will not be automatically called and the Index will decrease from the Starting Value to the Ending Value. §You seek 100% principal repayment or preservation of capital. §You seek interest payments or other current income on your investment. §You want to receive dividends or other distributions paid on the stocks included in the Index. §You seek an investment for which there will be a liquid secondary market. §You are unwilling or are unable to take market risk on the notes or to take our credit risk as issuer of the notes.

We urge you to consult your investment, legal, tax, accounting, and other advisors before you invest in the notes.

Autocallable Market-Linked Step Up Notes TS-4

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

Hypothetical Payout Profile at Maturity

The graph below is based on hypothetical numbers and values. The graph below shows a payout profile at maturity, which would only apply if the notes are not called on any Observation Date.

Autocallable Market-Linked Step Up Notes   This graph reflects the returns on the notes, based on the Threshold Value of 85% of the Starting Value, the Step Up Payment of $3.00 per unit and the Step Up Value of 130% of the Starting Value. The green line reflects the returns on the notes, while the dotted gray line reflects the returns of a direct investment in the stocks included in the Index, excluding dividends.   This graph has been prepared for purposes of illustration only.

Hypothetical Payments at Maturity

The following table and examples are for purposes of illustration only. They are based on hypothetical values and show hypothetical returns on the notes, assuming the notes are not called on any Observation Date. The actual amount you receive and the resulting total rate of return will depend on the actual Starting Value, Threshold Value, Ending Value and Step Up Value, whether the notes are called on an Observation Date, and term of your investment.

The following table is based on a Starting Value of 100, a Threshold Value of 85, a Step Up Value of 130 and the Step Up Payment of $3.00 per unit. It illustrates the effect of a range of Ending Values on the Redemption Amount per unit of the notes and the total rate of return to holders of the notes. The following examples do not take into account any tax consequences from investing in the notes.

Ending Value	Percentage Change from the Starting Value to the Ending Value	Redemption Amount per Unit	Total Rate of Return on the Notes
0.00	-100.00%	$1.50	-85.00%
50.00	-50.00%	$6.50	-35.00%
75.00	-25.00%	$9.00	-10.00%
80.00	-20.00%	$9.50	-5.00%
85.00(1)	-15.00%	$10.00	0.00%
90.00	-10.00%	$10.00	0.00%
95.00	-5.00%	$10.00	0.00%
100.00(2)	0.00%	$13.00(3)	30.00%
105.00	5.00%	$13.00	30.00%
110.00	10.00%	$13.00	30.00%
120.00	20.00%	$13.00	30.00%
130.00(4)	30.00%	$13.00	30.00%
135.00	35.00%	$13.50	35.00%
140.00	40.00%	$14.00	40.00%
150.00	50.00%	$15.00	50.00%
154.00	54.00%	$15.40	54.00%
160.00	60.00%	$16.00	60.00%

·

(1) This is the hypothetical Threshold Value.

(2) The hypothetical Starting Value of 100.00 used in these examples has been chosen for illustrative purposes only, and does not represent a likely actual Starting Value for the Index.

(3) This amount represents the sum of the principal amount and the Step Up Payment of $3.00.

(4) This is the hypothetical Step Up Value.

For recent actual levels of the Index, see “The Index” section below. The Index is a price return index and as such the Ending Value will not include any income generated by dividends paid on the stocks included in the Index, which you would otherwise be entitled to receive if you invested in those stocks directly. In addition, all payments on the notes are subject to issuer credit risk.

Autocallable Market-Linked Step Up Notes TS-5

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

Redemption Amount Calculation Examples

Example 1
The Ending Value is 50.00, or 50.00% of the Starting Value:
Starting Value:	100.00
Threshold Value:	85.00
Ending Value:	50.00

Redemption Amount per unit

Example 2
The Ending Value is 95.00, or 95.00% of the Starting Value:
Starting Value:	100.00
Threshold Value:	85.00
Ending Value:	95.00
Redemption Amount per unit = $10.00, the principal amount, since the Ending Value is less than the Starting Value, but is equal to or greater than the Threshold Value.

Example 3
The Ending Value is 110.00, or 110.00% of the Starting Value:
Starting Value:	100.00
Step Up Value:	130.00
Ending Value:	110.00

Redemption Amount per unit, the principal amount plus the Step Up Payment, since the Ending Value is equal to or greater than the Starting Value, but less than the Step Up Value.

Example 4
The Ending Value is 154.00, or 154.00% of the Starting Value:
Starting Value:	100.00
Step Up Value:	130.00
Ending Value:	154.00

Redemption Amount per unit

Autocallable Market-Linked Step Up Notes TS-6

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

Risk Factors

We urge you to read the section “Risk Factors” in the product supplement and in the accompanying prospectus supplement. Investing in the notes is not equivalent to investing directly in the stocks included in the Index. You should understand the risks of investing in the notes and should reach an investment decision only after careful consideration, with your advisers, with respect to the notes in light of your particular financial and other circumstances and the information set forth in this term sheet and the accompanying product supplement, prospectus supplement and prospectus.

In addition to the risks in the product supplement identified below, you should review “Risk Factors” in the accompanying prospectus supplement, including the explanation of risks relating to the notes described in the section “—Risks Relating to All Note Issuances.”

§ If the notes are not automatically called, depending on the performance of the Index as measured shortly before the maturity date, you may lose up to 85% of the principal amount.

§ Your return on the notes may be less than the yield you could earn by owning a conventional fixed or floating rate debt security of comparable maturity.

§ If the notes are called, your investment return is limited to the return represented by the applicable Call Premium.

§ Your investment return may be less than a comparable investment directly in the stocks included in the Index.

§ Payments on the notes are subject to our credit risk, and actual or perceived changes in our creditworthiness are expected to affect the value of the notes. If we become insolvent or are unable to pay our obligations, you may lose your entire investment.

§ The estimated initial value of the notes will be less than the public offering price and may differ from the market value of the notes in the secondary market, if any. We will determine the estimated initial value 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. These pricing models rely in part on certain forecasts about future events, which may prove to be incorrect. Different pricing models and assumptions could provide valuations for the notes that are different from our estimated initial value. The estimated initial value will reflect our internal funding rate we use to issue market-linked notes, as well as the mid-market value of the hedging arrangements related to the notes (which may include call options, put options or other derivatives).

§ Our internal funding rate for the issuance of these notes is lower than the rate we would use when we issue conventional fixed or floating rate debt securities. This is one of the factors that may result in the market value of the notes being less than their estimated initial value. 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 levels 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.

§ The price of your notes in the secondary market, if any, immediately after the pricing date will be less than the public offering price. The public offering price takes into account certain costs, principally the underwriting discount, the hedging costs described on page TS-12 and the costs associated with issuing the notes. The costs associated with issuing the notes will be used or retained by us or one of our affiliates. 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.

§ The estimated initial value does not represent a minimum price at which we, MLPF&S, BofAS or any of our respective 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, at any time after issuance will vary based on many factors, including the level of the Index 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.

§ A trading market is not expected to develop for the notes. Neither we nor MLPF&S, nor BofAS is obligated to make a market for, or to repurchase, the notes. There is no assurance that any party will be willing to purchase your notes at any price in any secondary market.

§ Our business, hedging and trading activities, and those of BofAS and our respective affiliates (including trades in shares of companies included in the Index), and any hedging and trading activities we, BofAS or our respective affiliates engage in for our clients’ accounts, may affect the market value and return of the notes and may create conflicts of interest with you.

§ The Index sponsor may adjust the Index in a way that affects its level, and has no obligation to consider your interests.

§ You will have no rights of a holder of the securities represented by the Index, and you will not be entitled to receive securities or dividends or other distributions by issuers of those securities.

§ While we, BofAS or our respective affiliates may from time to time own securities of companies included in the Index, except to the extent that the common stock of Bank of America Corporation (the parent company of MLPF&S and BofAS) is included in the Index, we, BofAS and our respective affiliates do not control any company included in the Index, and have not verified any disclosure made by any other company.

Autocallable Market-Linked Step Up Notes TS-7

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

§ There may be potential conflicts of interest involving the calculation agents, one of which is us and one of which is BofAS. We have the right to appoint and remove the calculation agents.

§ The U.S. federal income tax consequences of the notes are uncertain, and may be adverse to a holder of the notes. See “Summary Tax Consequences” below and “U.S. Federal Income Tax Summary” beginning on page PS-32 of product supplement EQUITY INDICES SUN-1.

Autocallable Market-Linked Step Up Notes TS-8

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

The Index

We have derived all information contained in this term sheet regarding the Index, including, without limitation, its make-up, method of calculation and changes in its components, from publicly available sources.  That information reflects the policies of and is subject to change by S&P Dow Jones Indices LLC (“S&P” or the “Index sponsor”). The Index sponsor is under no obligation to continue to publish, and may discontinue or suspend the publication of the Index at any time. The consequences of the Index sponsor discontinuing publication of the Index are discussed in the section entitled “Description of the Notes—Discontinuance of an Index” beginning on page PS-22 of product supplement EQUITY INDICES SUN-1. None of us, the calculation agents, MLPF&S, or BofAS accepts any responsibility for the calculation, maintenance or publication of the Index or any successor index.

General

The Index is intended to provide an indication of the pattern of common stock price movement. The calculation of the level of the Index, discussed below in further detail, is based on the relative value of the aggregate Market Value (as defined below) of the common stocks of 500 companies as of a particular time compared to the aggregate average Market Value of the common stocks of 500 similar companies during the base period of the years 1941 through 1943.

The Index does not reflect the payment of dividends on the stocks included in the Index and therefore the payment on the notes will not produce the same return you would receive if you were able to purchase such underlying stocks.

Relevant criteria employed by S&P include the viability of the particular company, the extent to which that company represents the industry group to which it is assigned, the extent to which the market price of that company’s common stock is generally responsive to changes in the affairs of the respective industry and the market value and trading activity of the common stock of that company. Eleven main industry groups comprise the Index: Communication Services, Consumer Discretionary, Consumer Staples, Energy, Financials, Health Care, Industrials, Information Technology, Materials, Real Estate and Utilities. Changes in the Index are reported daily in the financial pages of many major newspapers, on Bloomberg Professional^® service under the symbol “SPX” and on the S&P website. Information contained in the S&P website is not incorporated by reference in, and should not be considered a part of, this document. As of the close of business on September 21, 2018, S&P and MSCI, Inc. updated the Global Industry Classification Sector (“GICS”) structure. Among other things, the update broadened the Telecommunications Services sector and renamed it the Communication Services sector. The renamed sector includes the previously existing Telecommunication Services Industry group, as well as the Media Industry group, which was moved from the Consumer Discretionary sector and renamed the Media & Entertainment Industry group. The Media & Entertainment Industry group contains three industries: Media, Entertainment and Interactive Media & Services. The Media industry continues to consist of the Advertising, Broadcasting, Cable & Satellite and Publishing sub-industries. The Entertainment industry contains the Movies & Entertainment sub-industry (which includes online entertainment streaming companies in addition to companies previously classified in such industry prior to September 21, 2018) and the Interactive Home Entertainment sub-industry (which includes companies previously classified in the Home Entertainment Software sub-industry prior to September 21, 2018 (when the Home Entertainment Software sub-industry was a sub-industry in the Information Technology sector), as well as producers of interactive gaming products, including mobile gaming applications). The Interactive Media & Services industry and sub-industry includes companies engaged in content and information creation or distribution through proprietary platforms, where revenues are derived primarily through pay-per-click advertisements, and includes search engines, social media and networking platforms, online classifieds and online review companies. The GICS structure changes were effective for the Index as of the open of business on September 24, 2018 to coincide with the September 2018 quarterly rebalancing.

Computation of the Index

Prior to March 2005, the Market Value of a component stock was calculated as the product of the market price per share and the total number of outstanding shares of the component stock. In March 2004, S&P announced that it would transition the Index to float adjusted market capitalization weights. The transition began in March 2005 and was completed in September 2005. S&P’s criteria for selecting stock for the Index were not changed by the shift to float adjustment. However, the adjustment affects each company’s weight in the Index (i.e., its Market Value). Currently, S&P calculates the Index based on the total float-adjusted market capitalization of each component stock, where each stock’s weight in the Index is proportional to its float-adjusted Market Value.

Under the float adjustment, the share counts used in calculating the Index reflect only those shares that are available to investors, not all of a company’s outstanding shares. The float adjustment excludes shares that are closely held by control groups, other publicly traded companies or government agencies.

All shareholdings representing more than 5% of a stock’s outstanding shares, other than holdings by “block owners,” are removed from the float for purposes of calculating the Index. Generally, these “control shareholders” will include officers and directors, private equity, venture capital and special equity firms, other publicly traded companies that hold shares for control, strategic partners, holders of restricted shares, ESOPs, employee and family trusts, foundations associated with the company, holders of unlisted share classes of stock, government entities at all levels (other than government retirement/pension funds) and any individual person who controls a 5% or greater stake in a company as reported in regulatory filings. However, holdings by block owners, such as depositary banks, pension funds, mutual funds and ETF providers, 401(k) plans of the company, government retirement/pension funds, investment funds of insurance companies, asset managers and investment funds, independent foundations and savings and investment plans, will ordinarily be considered part of the float. Treasury stock, stock options, equity participation units, warrants, preferred stock, convertible stock, and rights are not part of the float. Shares of a U.S. company traded in Canada as “exchangeable shares” are normally part of the float

Autocallable Market-Linked Step Up Notes TS-9

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

unless those shares form a control block. All multiple share class companies that have listed share class lines will be adjusted for shares and float such that each share class line will only represent that line’s shares and float. The decision to include each publicly listed line is evaluated individually. All multiple share class companies that have an unlisted class line will also be adjusted.

For each stock, an investable weight factor (“IWF”) is calculated by dividing the available float shares by the total shares outstanding. As of September 21, 2012, available float shares are defined as the total shares outstanding less shares held by control holders. This calculation is subject to a 5% minimum threshold for control blocks. For example, if a company’s officers and directors hold 3% of the company’s shares, and no other control group holds 5% of the company’s shares, S&P would assign that company an IWF of 1.00, as no control group meets the 5% threshold. However, if a company’s officers and directors hold 3% of the company’s shares and another control group holds 20% of the company’s shares, S&P would assign an IWF of 0.77, reflecting the fact that 23% of the company’s outstanding shares are considered to be held for control. As of July 31, 2017, companies with multiple share class lines are no longer eligible for inclusion in the Index. Constituents of the Index prior to July 31, 2017 with multiple share class lines will be grandfathered in and continue to be included in the Index. If a constituent company of the Index reorganizes into a multiple share class line structure, that company will remain in the Index at the discretion of the S&P Index Committee in order to minimize turnover. For companies with multiple classes of stock, S&P calculates the weighted average IWF for each stock using the proportion of the total company market capitalization of each share class as weights.

The Index is also calculated using a base-weighted aggregate methodology: the level of the Index reflects the total Market Value of all the component stocks relative to the Index base period of 1941-43. The daily index value of the Index is the quotient of the total float-adjusted market capitalization of the Index’s constituents and its index divisor (the “Divisor”).

Ongoing maintenance of the Index includes monitoring and completing the adjustments for additions and deletions of the constituent companies, share changes, stock splits, stock dividends and stock price adjustments due to company restructurings or spin-offs. Continuity in the level of the Index is maintained by adjusting the Divisor for all changes in the Index constituents’ share capital after the base date. Some corporate actions, such as stock splits and stock dividends do not require Divisor adjustments because following a stock split or stock dividend, both the stock price and number of shares outstanding are adjusted by S&P so that there is no change in the Market Value of the component stock. Corporate actions (such as stock splits, stock dividends, non-zero price spin-offs and rights offerings) are applied after the close of trading on the day before the ex-date.

To prevent the level of the Index from changing due to corporate actions, all corporate actions which affect the total Market Value of the Index also require a Divisor adjustment. By adjusting the Divisor for the change in total Market Value, the level of the Index remains constant. This helps maintain the level of the Index as an accurate barometer of stock market performance and ensures that the movement of the Index does not reflect the corporate actions of individual companies in the Index. The divisor is adjusted such that the index value at an instant just prior to a change in base capital equals the index value at an instant immediately following that change. As noted in the preceding paragraph, some corporate actions, such as stock splits and stock dividends, require simple changes in the common shares outstanding and the stock prices of the companies in the Index and do not require Divisor adjustments.

Index maintenance adjustments will be made to account for certain corporate actions, such as addition/deletion of companies, change in shares outstanding, stock split, spin-off, change in IWF, special dividend, and rights offering. For certain index maintenance adjustments, the divisor will be adjusted and a new divisor will be calculated to account for the altered Market Value of the Index.

Another large part of the Index maintenance process involves tracking the changes in the number of shares outstanding of each of the companies whose stocks are included in the Index. To prevent the level of the Index from changing due to corporate actions, corporate actions which affect the total Market Value of the Index require a Divisor adjustment. By adjusting the Divisor for the change in Market Value, the level of the Index remains constant and does not reflect the corporate actions of individual companies in the Index. Divisor adjustments are made after the close of trading and after the calculation of the Index closing level.

Changes in a company’s shares outstanding and IWF due to its acquisition of another public company are made as soon as reasonably possible. At S&P’s discretion, de minimis merger and acquisition share changes are accumulated and implemented with the quarterly share rebalancing.

All other changes of less than 5% are accumulated and made quarterly on the third Friday of March, June, September, and December.

Changes in a company’s total shares outstanding of 5% or more due to public offerings are made as soon as reasonably possible. Other changes of 5% or more (for example, due to tender offers, Dutch auctions, voluntary exchange offers, company stock repurchases, private placements, acquisitions of private companies or non-index companies that do not trade on a major exchange, redemptions, exercise of options, warrants, conversion of preferred stock, notes, debt, equity participations, at-the-market stock offerings or other recapitalizations) are made weekly, and are generally announced on Fridays for implementation after the close of trading the following Friday (one week later). If a 5% or more share change causes a company’s IWF to change by five percentage points or more, the IWF is updated at the same time as the share change. IWF changes resulting from partial tender offers are considered on a case-by-case basis.

Autocallable Market-Linked Step Up Notes TS-10

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

The following graph shows the daily historical performance of the Index in the period from January 1, 2008 through May 15, 2019. We obtained this historical data from Bloomberg L.P. We have not independently verified the accuracy or completeness of the information obtained from Bloomberg L.P. On May 15, 2019, the closing level of the Index was 2,850.96.

Historical Performance of the Index

This historical data on the Index is not necessarily indicative of the future performance of the Index or what the value of the notes may be. Any historical upward or downward trend in the level of the Index during any period set forth above is not an indication that the level of the Index is more or less likely to increase or decrease at any time over the term of the notes.

Before investing in the notes, you should consult publicly available sources for the levels of the Index.

License Agreement

HSBC has entered into a nonexclusive license agreement providing for the license to it, in exchange for a fee, of the right to use indices owned and published by S&P in connection with some products, including the notes.

Standard & Poor’s^® and S&P^® are registered trademarks of Standard & Poor’s Financial Services LLC (“Standard & Poor’s”); Dow Jones^® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); and these trademarks have been licensed for use by S&P. “Standard & Poor’s^®,” “S&P 500^®” and “S&P^®” are trademarks of Standard & Poor’s and have been licensed for use by S&P and its affiliates and sublicensed for certain purposes by HSBC. The Index is a product of S&P, and has been licensed for use by HSBC.

The notes are not sponsored, endorsed, sold or promoted by S&P, Dow Jones, Standard & Poor’s or any of their respective affiliates (collectively, “S&P Dow Jones Indices”). S&P makes any representation or warranty, express or implied, to the holders of the notes or any member of the public regarding the advisability of investing in securities generally or in the notes particularly or the ability of the Index to track general market performance. S&P’s only relationship to HSBC is the licensing of the Index and certain trademarks, service marks and/or trade names of S&P. The Index is determined, composed and calculated by S&P without regard to HSBC or the notes. S&P has no obligation to take the needs of HSBC or the holders of the notes into consideration in determining, composing or calculating the Index. S&P is not responsible for and has not participated in the determination of the prices and amount of the notes or the timing of the issuance or sale of the notes or in the determination or calculation of the equation by which the notes are to be converted into cash. S&P has no obligation or liability in connection with the administration, marketing or trading of the notes. There is no assurance that investment products based on the Index will accurately track index performance or provide positive investment returns. S&P is not an investment advisor. Inclusion of a security within the Index is not a recommendation by S&P to buy, sell or hold such security, nor is it considered to be investment advice.

S&P DOES NOT GUARANTEE THE ADEQUACY, ACCURACY, TIMELINESS AND/OR THE COMPLETENESS OF THE INDEX OR ANY DATA RELATED THERETO OR ANY COMMUNICATION, INCLUDING BUT NOT LIMITED TO, ORAL OR WRITTEN COMMUNICATION (INCLUDING ELECTRONIC COMMUNICATIONS) WITH RESPECT THERETO. S&P SHALL NOT BE SUBJECT TO ANY DAMAGES OR LIABILITY FOR ANY ERRORS, OMISSIONS OR DELAYS THEREIN. S&P MAKES NO EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE OR AS TO RESULTS TO BE OBTAINED BY HSBC, HOLDERS OF THE NOTES, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE INDEX OR WITH RESPECT TO ANY DATA RELATED THERETO. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT WHATSOEVER SHALL S&P BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL DAMAGES, INCLUDING BUT NOT LIMITED TO, LOSS OF PROFITS, TRADING LOSSES, LOST TIME OR GOODWILL, EVEN IF THEY HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, WHETHER IN CONTRACT, TORT, STRICT LIABILITY, OR OTHERWISE. THERE ARE NO THIRD PARTY BENEFICIARIES OF ANY AGREEMENTS OR ARRANGEMENTS BETWEEN S&P AND HSBC, OTHER THAN THE LICENSORS OF S&P.

Autocallable Market-Linked Step Up Notes TS-11

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

Supplement to the Plan of Distribution

We may deliver the notes against payment therefor in New York, New York on a date that is greater than two business days following the pricing date. Under Rule 15c6-1 of the Securities Exchange Act of 1934, trades in the secondary market generally are required to settle in two business days, unless the parties to any such trade expressly agree otherwise. Accordingly, if the initial settlement of the notes occurs more than two business days from the pricing date, purchasers who wish to trade the notes more than two business days prior to the original issue date will be required to specify alternative settlement arrangements to prevent a failed settlement.

The notes will not be listed on any securities exchange. In the original offering of the notes, the notes will be sold in minimum investment amounts of 100 units. If you place an order to purchase the notes, you are consenting to MLPF&S and/or one of its affiliates acting as a principal in effecting the transaction for your account.

MLPF&S will purchase the notes from BofAS for resale, and will receive a selling concession in connection with the sale of the notes in an amount up to the full amount of underwriting discount set forth on the cover of this term sheet.

MLPF&S and BofAS may repurchase and resell the notes, with repurchases and resales being made at prices related to then-prevailing market prices or at negotiated prices, and these will include MLPF&S’s and BofAS’s trading commissions and mark-ups or mark-downs. MLPF&S and BofAS may act as principal or agent in these market-making transactions; however, neither is obligated to engage in any such transactions. At their discretion, for a short, undetermined initial period after the issuance of the notes, MLPF&S and BofAS may offer to buy the notes in the secondary market at a price that may exceed the estimated initial value of the notes. Any price offered by MLPF&S or BofAS for the notes will be based on then-prevailing market conditions and other considerations, including the performance of the Index, the remaining term of the notes, and the issuer’s creditworthiness. However, neither we nor any of our affiliates are obligated to purchase your notes at any price, or at any time, and we cannot assure you that we, MLPF&S, BofAS or any of our respective affiliates will purchase your notes at a price that equals or exceeds the estimated initial value of the notes.

The value of the notes shown on your account statement provided by BofAS’s will be based on their estimate of the value of the notes if BofAS or one of its affiliates were to make a market in the notes, which it is not obligated to do. This estimate will be based upon the price that BofAS may pay for the notes in light of then-prevailing market conditions, and other considerations, as mentioned above, and will include transaction costs. At certain times, this price may be higher than or lower than the estimated initial value of the notes.

The distribution of the Note Prospectus in connection with these offers or sales will be solely for the purpose of providing investors with the description of the terms of the notes that was made available to investors in connection with their initial offering. Secondary market investors should not, and will not be authorized to, rely on the Note Prospectus for information regarding HSBC or for any purpose other than that described in the immediately preceding sentence.

An investor’s household, as referenced on the cover of this term sheet, will generally include accounts held by any of the following, as determined by MLPF&S in its discretion and acting in good faith based upon information then available to MLPF&S:

· the investor’s spouse (including a domestic partner), siblings, parents, grandparents, spouse’s parents, children and grandchildren, but excluding accounts held by aunts, uncles, cousins, nieces, nephews or any other family relationship not directly above or below the individual investor;

· a family investment vehicle, including foundations, limited partnerships and personal holding companies, but only if the beneficial owners of the vehicle consist solely of the investor or members of the investor’s household as described above; and

· a trust where the grantors and/or beneficiaries of the trust consist solely of the investor or members of the investor’s household as described above; provided that, purchases of the notes by a trust generally cannot be aggregated together with any purchases made by a trustee’s personal account.

Purchases in retirement accounts will not be considered part of the same household as an individual investor’s personal or other non-retirement account, except for individual retirement accounts (“IRAs”), simplified employee pension plans (“SEPs”), savings incentive match plan for employees (“SIMPLEs”), and single-participant or owners only accounts (i.e., retirement accounts held by self-employed individuals, business owners or partners with no employees other than their spouses).

Please contact your Merrill Lynch financial advisor if you have any questions about the application of these provisions to your specific circumstances or think you are eligible.

Role of MLPF&S and BofAS

BofAS will participate as selling agent in the distribution of the notes. Under our distribution agreement with BofAS, BofAS will purchase the notes from us as principal at the public offering price indicated on the cover of this term sheet, less the indicated underwriting discount.

Payments on the notes, including the amount you receive at maturity or upon an automatic call, will be calculated based on the $10 per unit principal amount and will depend on the performance of the Index. In order to meet these payment obligations, at the time we issue the notes, we may choose to enter into certain hedging arrangements (which may include call options, put options or other derivatives) with BofAS or one of its affiliates. The terms of these hedging arrangements are determined by BofAS seeking bids from market participants, which could include one of our affiliates and MLPF&S, BofAS and their affiliates. These hedging arrangements take into account a number of factors, including the issuer’s creditworthiness, interest rate movements, the volatility of the Index, the tenor of the

Autocallable Market-Linked Step Up Notes TS-12

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

notes and the tenor of the hedging arrangements. The economic terms of the notes depend in part on the terms of the hedging arrangements.

BofAS has advised us that the hedging arrangements will include a hedging related charge of approximately $0.075 per unit, reflecting an estimated profit to be credited to BofAS from these transactions. Since hedging entails risk and may be influenced by unpredictable market forces, additional profits and losses from these hedging arrangements may be realized by BofAS or any third party hedge providers.

For further information, see “Risk Factors—General Risks Relating to the Notes” beginning on page PS-7 and “Use of Proceeds” on page PS-17 of product supplement EQUITY INDICES SUN-1.

Autocallable Market-Linked Step Up Notes TS-13

Autocallable Market-Linked Step Up Notes
Linked to the S&P 500^® Index, due May  , 2025

Summary Tax Consequences

You should consider the U.S. federal income tax consequences of an investment in the notes, including the following:

§ There is no statutory, judicial, or administrative authority directly addressing the characterization of the notes.

§ You agree with us (in the absence of an administrative determination, or judicial ruling to the contrary) to characterize and treat the notes for all tax purposes as pre-paid executory contracts with respect to the Index.

§ Under this characterization and tax treatment of the notes, a U.S. holder (as defined in the prospectus supplement) generally will recognize capital gain or loss upon maturity or upon a sale or exchange of the notes prior to maturity. This capital gain or loss generally will be long-term capital gain or loss if you held the notes for more than one year.

§ No assurance can be given that the IRS or any court will agree with this characterization and tax treatment.

§ 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, 2021. Based on our 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 the Index 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 the Index 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.

§ The discussion in the accompanying prospectus supplement under “U.S. Federal Income Tax Considerations – Foreign Account Tax Compliance Act” is hereby modified to reflect regulations proposed by the U.S. Department of Treasury indicating its intent to eliminate the requirements under FATCA of withholding on gross proceeds from the sale, exchange, maturity or other disposition of relevant financial instruments. The U.S. Department of Treasury has indicated that taxpayers may rely on these proposed regulations pending their finalization.

You should consult your own tax advisor concerning the U.S. federal income tax consequences to you of acquiring, owning, and disposing of the notes, as well as any tax consequences arising under the laws of any state, local, foreign, or other tax jurisdiction and the possible effects of changes in U.S. federal or other tax laws. You should review carefully the discussion under the section entitled “U.S. Federal Income Tax Summary” beginning on page PS-32 of product supplement EQUITY INDICES SUN-1.

Where You Can Find More Information

We have filed a registration statement (including a product supplement, a prospectus supplement and a prospectus) with the SEC for the offering to which this term sheet relates. Before you invest, you should read the Note Prospectus, including this term sheet, and the other documents that we have filed with the SEC, for more complete information about us and this offering. You may get these documents without cost by visiting EDGAR on the SEC website at www.sec.gov. Alternatively, we, any agent, or any dealer participating in this offering will arrange to send you these documents if you so request by calling MLPF&S or BofAS toll-free at 1-800-294-1322.

Market-Linked Investments Classification

MLPF&S classifies certain market-linked investments (the “Market-Linked Investments”) into categories, each with different investment characteristics. The following description is meant solely for informational purposes and is not intended to represent any particular Enhanced Return Market-Linked Investment or guarantee any performance.

Enhanced Return Market-Linked Investments are short- to medium-term investments that offer you a way to enhance exposure to a particular market view without taking on a similarly enhanced level of market downside risk. They can be especially effective in a flat to moderately positive market (or, in the case of bearish investments, a flat to moderately negative market). In exchange for the potential to receive better-than market returns on the linked asset, you must generally accept market downside risk and capped upside potential. As these investments are not market downside protected, and do not assure full repayment of principal at maturity, you need to be prepared for the possibility that you may lose all or part of your investment.

Autocallable Market-Linked Step Up Notes TS-14