Primary Offering Prospectus (Form 424B2)

The initial estimated value of the Securities as of the Pricing Date is expected to be between $896.75 and $966.75 per Security, which is less than the public offering price listed below. The actual value of your Securities at any time will reflect many factors and cannot be predicted with accuracy. See "Selected Risk Considerations" beginning on page PS-9 of this pricing supplement and "Structuring the Securities" on page PS-21 of this pricing supplement for additional information.
The Securities have complex features and investing in the Securities involves risks not associated with an investment in conventional debt securities. Potential purchasers of the Securities should consider the information in "Selected Risk Considerations" beginning on page PS-9 herein and "Risk Factors" beginning on page PS-5 of the accompanying product supplement, page S-6 of the accompanying prospectus supplement, and page 7 of the accompanying prospectus.
None of the Securities and Exchange Commission (the "SEC"), any state securities commission, or any other regulatory body has approved or disapproved of these Securities or determined if this pricing supplement and the accompanying product supplement, prospectus supplement and prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

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PS-3

* Subject to change

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The terms and risks of the Securities are contained in this pricing supplement and in the following related product supplement, prospectus supplement and prospectus. Information included in this pricing supplement supersedes information in the product supplement, prospectus supplement and prospectus to the extent that it is different from that information. These documents can be accessed at the following links:

https://www.sec.gov/Archives/edgar/data/1682472/000119312523064044/d451936d424b2.htm

These documents have been filed as part of a registration statement with the SEC, which may, without cost, be accessed on the SEC website at www.sec.gov or obtained from BofAS by calling 1-800-294-1322. Before you invest, you should read this pricing supplement and the accompanying product supplement, prospectus supplement and prospectus for information about us, BAC and this offering. Any prior or contemporaneous oral statements and any other written materials you may have received are superseded by this pricing supplement and the accompanying product supplement, prospectus supplement and prospectus. Certain terms used but not defined in this pricing supplement have the meanings set forth in the accompanying product supplement or prospectus supplement. Unless otherwise indicated or unless the context requires otherwise, all references in this document to "we," "us," "our," or similar references are to BofA Finance, and not to BAC.

The Securities are our senior debt securities. Any payments on the Securities are fully and unconditionally guaranteed by BAC. The Securities and the related guarantee are not insured by the Federal Deposit Insurance Corporation or secured by collateral. The Securities will rank equally in right of payment with all of our other unsecured and unsubordinated obligations, except obligations that are subject to any priorities or preferences by law. The related guarantee will rank equally in right of payment with all of BAC's other unsecured and unsubordinated obligations, except obligations that are subject to any priorities or preferences by law, and senior to its subordinated obligations. Any payments due on the Securities, including any repayment of the principal amount, will be subject to the credit risk of BofA Finance, as issuer, and BAC, as guarantor.

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

■ seek an investment with contingent coupon payments at a rate of at least 25.00% per annum (to be determined on the Pricing Date) until the earlier of the Maturity Date or automatic call, if, and only if, the stock closing price of the Lowest Performing Underlying Stock on the applicable Calculation Day is greater than or equal to 70% of its Starting Price;

■ understand that if the Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day has declined by more than 30% from its Starting Price, they will be fully exposed to the decline in the Lowest Performing Underlying Stock from its Starting Price and will lose more than 30%, and possibly all, of the principal amount of their Securities at maturity;

■ are willing to accept the risk that they may receive few or no Contingent Coupon Payments over the term of the Securities;

■ understand that the Securities may be automatically called prior to the Maturity Date and that the term of the Securities may be as short as approximately six months;

■ understand that the return on the Securities will depend solely on the performance of the Lowest Performing Underlying Stock on each Calculation Day and that they will not benefit in any way from the performance of the better performing Underlying Stocks;

■ understand that the Securities are riskier than alternative investments linked to only one of the Underlying Stocks or linked to a basket composed of each Underlying Stock;

■ understand and are willing to accept the full downside risks of each Underlying Stock;

■ are willing to forgo participation in any appreciation of any Underlying Stock and dividends on the Underlying Stocks; and

■ are willing to hold the Securities until maturity.

The Securities may not be an appropriate investment for investors who:

■ seek a liquid investment or are unable or unwilling to hold the Securities to maturity;

■ require full payment of the principal amount of the Securities at maturity;

■ seek a security with a fixed term;

■ are unwilling to purchase Securities with an estimated value as of the Pricing Date that is lower than the public offering price and that may be as low as the lower estimated value set forth on the cover page;

■ are unwilling to accept the risk that the stock closing price of the Lowest Performing Underlying Stock on the Final Calculation Day may decline by more than 30% from its Starting Price;

■ seek certainty of current income over the term of the Securities;

■ seek exposure to the upside performance of any or each Underlying Stock;

■ seek exposure to a basket composed of each Underlying Stock or a similar investment in which the overall return is based on a blend of the performances of the Underlying Stocks, rather than solely on the Lowest Performing Underlying Stock;

■ are unwilling to accept the risk of exposure to the Underlying Stocks;

■ are unwilling to accept the credit risk of BofA Finance, as issuer, and BAC, as guarantor, to obtain exposure to the Underlying Stocks generally, or to obtain exposure to the Underlying Stocks that the Securities provide specifically; or

■ prefer the lower risk of conventional fixed income investments with comparable maturities issued by companies with comparable credit ratings.

The considerations identified above are not exhaustive. Whether or not the Securities are an appropriate investment for you will depend on your individual circumstances, and you should reach an investment decision only after you and your investment, legal, tax, accounting and other advisors have carefully considered the appropriateness of an investment in the Securities in light of your particular circumstances. You should also review carefully "Selected Risk Considerations" herein and "Risk Factors" in each of the accompanying product supplement, prospectus supplement and prospectus for risks related to an investment in the Securities. For more information about the Underlying Stocks, please see the sections titled "The Class A Common Stock of Meta Platforms, Inc.," "The Common Stock of Adobe Inc." and "The Common Stock of Chipotle Mexican Grill, Inc." below.

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If the Securities have not been previously automatically called, on each Contingent Coupon Payment Date, either you will receive a Contingent Coupon Payment or you will not receive a Contingent Coupon Payment, depending on the stock closing price of the Lowest Performing Underlying Stock on the related Calculation Day.

Step 1: Determine which Underlying Stock is the Lowest Performing Underlying Stock on the relevant Calculation Day. The Lowest Performing Underlying Stock on any Calculation Day is the Underlying Stock with the lowest Performance Factor on that Calculation Day. The Performance Factor of an Underlying Stock on a Calculation Day is its stock closing price on that Calculation Day as a percentage of its Starting Price (i.e., its stock closing price on that Calculation Day divided by its Starting Price).

Step 2: Determine whether a Contingent Coupon is paid on the applicable Contingent Coupon Payment Date based on the stock closing price of the Lowest Performing Underlying Stock on the relevant Calculation Day, as follows:

If the Securities have not been automatically called prior to the Maturity Date, then at maturity you will receive (in addition to the final Contingent Coupon Payment, if otherwise payable) a cash payment per Security (the Maturity Payment Amount) calculated as follows:

Step 1: Determine which Underlying Stock is the Lowest Performing Underlying Stock on the Final Calculation Day. The Lowest Performing Underlying Stock on the Final Calculation Day is the Underlying Stock with the lowest Performance Factor on the Final Calculation Day. The Performance Factor of an Underlying Stock on the Final Calculation Day is its Ending Price as a percentage of its Starting Price (i.e., its Ending Price divided by its Starting Price).

Step 2: Calculate the Maturity Payment Amount based on the Ending Price of the Lowest Performing Underlying Stock, as follows:

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The following profile illustrates the potential Maturity Payment Amount on the Securities (excluding the final Contingent Coupon Payment, if any) for a range of hypothetical performances of the Lowest Performing Underlying Stock on the Final Calculation Day from its Starting Price to its Ending Price, assuming the Securities have not been automatically called prior to the Maturity Date. As this profile illustrates, in no event will you have a positive rate of return based solely on the Maturity Payment Amount received at maturity; any positive return will be based solely on the Contingent Coupon Payments, if any, received during the term of the Securities. This graph has been prepared for purposes of illustration only. Your actual return will depend on the actual Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day and whether you hold your Securities to the Maturity Date. The performance of the better performing Underlying Stocks is not relevant to your return on the Securities.

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The Securities have complex features and investing in the Securities will involve risks not associated with an investment in conventional debt securities. Your decision to purchase the Securities should be made only after carefully considering the risks of an investment in the Securities, including those discussed below, with your advisors in light of your particular circumstances. The Securities are not an appropriate investment for you if you are not knowledgeable about significant elements of the Securities or financial matters in general. You should carefully review the more detailed explanation of risks relating to the Securities in the "Risk Factors" sections beginning on page PS-5 of the accompanying product supplement, page S-6 of the accompanying prospectus supplement and page 7 of the accompanying prospectus.

Structure-related Risks

Your investment may result in a loss; there is no guaranteed return of principal. There is no fixed principal repayment amount on the Securities at maturity. If the Securities are not automatically called prior to maturity and the Ending Price of any Underlying Stock is less than its Threshold Price, at maturity you will lose 1% of the principal amount for each 1% that the Ending Price of the Lowest Performing Underlying Stock is less than its Starting Price. In that case, you will lose a significant portion or all of your investment in the Securities.

Your return on the Securities is limited to the return represented by the Contingent Coupon Payments, if any, over the term of the Securities. Your return on the Securities is limited to the Contingent Coupon Payments paid over the term of the Securities, regardless of the extent to which the stock closing price of any Underlying Stock on any Calculation Day or the Ending Price of any Underlying Stock exceeds its Coupon Barrier or Starting Price, as applicable. Similarly, the amount payable at maturity or upon an automatic call will never exceed the sum of the principal amount and the applicable Contingent Coupon Payment, regardless of the extent to which the stock closing price of any Underlying Stock on any Calculation Day exceeds its Starting Price. In contrast, a direct investment in one or more of the Underlying Stocks would allow you to receive the benefit of any appreciation in their prices. Thus, any return on the Securities will not reflect the return you would realize if you actually owned those securities and received the dividends paid or distributions made on them.

The Securities are subject to a potential automatic call, which would limit your ability to receive the Contingent Coupon Payments over the full term of the Securities. The Securities are subject to a potential automatic call. Beginning in May 2026, the Securities will be automatically called if, on any Calculation Day prior to the Final Calculation Day, the stock closing price of the Lowest Performing Underlying Stock is greater than or equal to its Starting Price. If the Securities are automatically called prior to the Maturity Date, you will be entitled to receive the principal amount and the Contingent Coupon Payment with respect to the applicable Calculation Day, and no further amounts will be payable with respect to the Securities. In this case, you will lose the opportunity to continue to receive Contingent Coupon Payments after the date of the automatic call. If the Securities are called prior to the Maturity Date, you may be unable to invest in other securities with a similar level of risk that could provide a return that is similar to the Securities.

You may not receive any Contingent Coupon Payments. The Securities do not provide for any regular fixed coupon payments. Investors in the Securities will not necessarily receive any Contingent Coupon Payments on the Securities. If the stock closing price of the Lowest Performing Underlying Stock on a Calculation Day is less than its Coupon Barrier, you will not receive the Contingent Coupon Payment applicable to that Calculation Day. If the stock closing price of the Lowest Performing Underlying Stock is less than its Coupon Barrier on all the Calculation Days during the term of the Securities, you will not receive any Contingent Coupon Payments during the term of the Securities, and will not receive a positive return on the Securities.

Because the Securities are linked to the lowest performing (and not the average performance) of the Underlying Stocks, you may not receive any return on the Securities and may lose a significant portion or all of your principal amount even if the stock closing price of one Underlying Stock is always greater than or equal to its Coupon Barrier or Threshold Price, as applicable. Your Securities are linked to the lowest performing of the Underlying Stocks, and a change in the price of one Underlying Stock may not correlate with changes in the price of the other Underlying Stocks. The Securities are not linked to a basket composed of the Underlying Stocks, where the depreciation in the price of one Underlying could be offset to some extent by the appreciation in the price of the other Underlying Stocks. In the case of the Securities, the individual performance of each Underlying Stock would not be combined, and the depreciation in the price of one Underlying Stock would not be offset by any appreciation in the price of the other Underlying Stocks. Even if the stock closing price of an Underlying Stock is at or above its Coupon Barrier on a Calculation Day, you will not receive the Contingent Coupon Payment with respect to that Calculation Day if the stock closing price of another Underlying Stock is below its Coupon Barrier on that day. In addition, even if the Ending Price of an Underlying Stock is at or above its Threshold Price, you will lose a portion of your principal if the Ending Price of the Lowest Performing Underlying Stock is below its Threshold Price.

Higher Contingent Coupon Rates are associated with greater risk. The Securities offer Contingent Coupon Payments at a higher rate, if paid, than the fixed rate we would pay on conventional debt securities of the same maturity. These higher potential Contingent Coupon Payments are associated with greater levels of expected risk as of the Pricing Date as compared to conventional debt securities, including the risk that you may not receive a Contingent Coupon Payment on one or more, or any, Contingent Coupon Payment Dates and the risk that you may lose a substantial portion, and possibly all, of the principal amount per Security at maturity. The volatility of the Underlying Stocks and the correlation among the Underlying Stocks are important factors affecting this risk. Volatility is a

PS-9

measurement of the size and frequency of daily fluctuations in the price of an Underlying Stock, typically observed over a specified period of time. Volatility can be measured in a variety of ways, including on a historical basis or on an expected basis as implied by option prices in the market. Correlation is a measurement of the extent to which the prices of the Underlying Stocks tend to fluctuate at the same time, in the same direction and in similar magnitudes. Greater expected volatility of the Underlying Stocks or lower expected correlation among the Underlying Stocks as of the Pricing Date may result in a higher Contingent Coupon Rate, but it also represents a greater expected likelihood as of the Pricing Date that the stock closing price of at least one Underlying Stock will be less than its Coupon Barrier on one or more Calculation Days, such that you will not receive one or more, or any, Contingent Coupon Payments during the term of the Securities, and that the stock closing price of at least one Underlying Stock will be less than its Threshold Price on the Final Calculation Day such that you will lose a substantial portion, and possibly all, of the principal amount per Security at maturity. In general, the higher the Contingent Coupon Rate is relative to the fixed rate we would pay on conventional debt securities, the greater the expected risk that you will not receive one or more, or any, Contingent Coupon Payments during the term of the Securities and that you will lose a substantial portion, and possibly all, of the principal amount per Security at maturity.

Your return on the Securities may be less than the yield on a conventional debt security of comparable maturity. Any return that you receive on the Securities may be less than the return you would earn if you purchased a conventional debt security with the same Maturity Date. As a result, your investment in the Securities may not reflect the full opportunity cost to you when you consider factors, such as inflation, that affect the time value of money. In addition, if interest rates increase during the term of the Securities, the Contingent Coupon Payment (if any) may be less than the yield on a conventional debt security of comparable maturity.

The Contingent Coupon Payment, payment upon automatic call or Maturity Payment Amount, as applicable, will not reflect the prices of the Underlying Stocks other than on the Calculation Days. The prices of the Underlying Stocks during the term of the Securities other than on the Calculation Days will not affect payments on the Securities. Notwithstanding the foregoing, investors should generally be aware of the performance of the Underlying Stocks while holding the Securities, as the performance of the Underlying Stocks may influence the market value of the Securities. The calculation agent will determine whether each Contingent Coupon Payment is payable and will calculate the payment upon an automatic call or the Maturity Payment Amount, as applicable, by comparing only the Starting Price, the Coupon Barrier or the Threshold Price, as applicable, to the stock closing price on the applicable Calculation Day or the Ending Price for each Underlying Stock. No other prices of the Underlying Stocks will be taken into account. As a result, if the Securities are not automatically called prior to maturity, and the Ending Price of the Lowest Performing Underlying Stock is less than its Threshold Price, you will receive less than the principal amount at maturity even if the price of each Underlying Stock was always above its Threshold Price prior to the Final Calculation Day.

A Contingent Coupon Payment Date, a Call Settlement Date and the Maturity Date may be postponed if a Calculation Day is postponed. A Calculation Day (including the Final Calculation Day) with respect to an Underlying Stock will be postponed if the applicable originally scheduled Calculation Day is not a trading day with respect to any Underlying Stock or if the calculation agent determines that a market disruption event has occurred or is continuing with respect to that Underlying Stock on that Calculation Day. If such a postponement occurs with respect to an Calculation Day other than the Final Calculation Day, then the related Contingent Coupon Payment Date or Call Settlement Date, as applicable, will be postponed. If such a postponement occurs with respect to the Final Calculation Day, the Maturity Date will be the later of (i) the initial Maturity Date and (ii) three business days after the last Final Calculation Day as postponed.

Any payment on the Securities is subject to our credit risk and the credit risk of the Guarantor, and actual or perceived changes in our or the Guarantor's creditworthiness are expected to affect the value of the Securities. The Securities are our senior unsecured debt securities. Any payment on the Securities will be fully and unconditionally guaranteed by the Guarantor. The Securities are not guaranteed by any entity other than the Guarantor. As a result, your receipt of the payment upon an automatic call or the Maturity Payment Amount at maturity, as applicable, will be dependent upon our ability and the ability of the Guarantor to repay our respective obligations under the Securities on the applicable Contingent Coupon Payment Date, Call Settlement Date or the Maturity Date, regardless of the stock closing price of the Lowest Performing Underlying Stock as compared to its Starting Price. No assurance can be given as to what our financial condition or the financial condition of the Guarantor will be at any time after the Pricing Date of the Securities. If we and the Guarantor become unable to meet our respective financial obligations as they become due, you may not receive the amount(s) payable under the terms of the Securities.

In addition, our credit ratings and the credit ratings of the Guarantor are assessments by ratings agencies of our respective abilities to pay our obligations. Consequently, our or the Guarantor's perceived creditworthiness and actual or anticipated decreases in our or the Guarantor's credit ratings or increases in the spread between the yield on our respective securities and the yield on U.S. Treasury securities (the "credit spread") prior to the Maturity Date of your Securities may adversely affect the market value of the Securities. However, because your return on the Securities depends upon factors in addition to our ability and the ability of the Guarantor to pay our respective obligations, such as the prices of the Underlying Stocks, an improvement in our or the Guarantor's credit ratings will not reduce the other investment risks related to the Securities.

We are a finance subsidiary and, as such, have no independent assets, operations or revenues. We are a finance subsidiary of the Guarantor, have no operations other than those related to the issuance, administration and repayment of our debt securities that are guaranteed by the Guarantor, and are dependent upon the Guarantor and/or its other subsidiaries to meet our obligations under the Securities in the ordinary course. Therefore, our ability to make payments on the Securities may be limited.

PS-10

Valuation- and Market-related Risks

The public offering price you pay for the Securities will exceed their initial estimated value. The range of initial estimated values of the Securities that is provided on the cover page of this preliminary pricing supplement, and the initial estimated value as of the Pricing Date that will be provided in the final pricing supplement, are each estimates only, determined as of a particular point in time by reference to our and our affiliates' pricing models. These pricing models consider certain assumptions and variables, including our credit spreads and those of the Guarantor, the Guarantor's internal funding rate, mid-market terms on hedging transactions, expectations on interest rates, dividends and volatility, price-sensitivity analysis, and the expected term of the Securities. These pricing models rely in part on certain forecasts about future events, which may prove to be incorrect. If you attempt to sell the Securities prior to maturity, their market value may be lower than the price you paid for them and lower than their initial estimated value. This is due to, among other things, changes in the prices of the Underlying Stocks, changes in the Guarantor's internal funding rate, and the inclusion in the public offering price of the underwriting discount and the hedging related charges, all as further described in "Structuring the Securities" below. These factors, together with various credit, market and economic factors over the term of the Securities, are expected to reduce the price at which you may be able to sell the Securities in any secondary market and will affect the value of the Securities in complex and unpredictable ways.

The initial estimated value does not represent a minimum or maximum price at which we, BAC, BofAS or any of our other affiliates or WFS or its affiliates would be willing to purchase your Securities in any secondary market (if any exists) at any time. The value of your Securities at any time after issuance will vary based on many factors that cannot be predicted with accuracy, including the performance of the Underlying Stocks, our and BAC's creditworthiness and changes in market conditions.

We cannot assure you that a trading market for your Securities will ever develop or be maintained. We will not list the Securities on any securities exchange. We cannot predict how the Securities will trade in any secondary market or whether that market will be liquid or illiquid.

The Securities are not designed to be short-term trading instruments, and if you attempt to sell the Securities prior to maturity, their market value, if any, will be affected by various factors that interrelate in complex ways, and their market value may be less than the principal amount. The following factors are expected to affect the value of the Securities: price of the Underlying Stocks at such time; volatility of the Underlying Stocks; economic and other conditions generally; interest rates; dividend yields; our and the Guarantor's financial condition and creditworthiness; and time to maturity.

Conflict-related Risks

Trading and hedging activities by us, the Guarantor and any of our other affiliates, including BofAS, and WFS and its affiliates, may create conflicts of interest with you and may affect your return on the Securities and their market value. We, the Guarantor or one or more of our other affiliates, including BofAS, and WFS and its affiliates, may buy or sell the Underlying Stocks, or futures or options contracts on the Underlying Stocks, or other listed or over-the-counter derivative instruments linked to the Underlying Stocks. While we, the Guarantor or one or more of our other affiliates, including BofAS, and WFS and its affiliates, may from time to time own shares of the Underlying Stocks, we, the Guarantor and our other affiliates, including BofAS, and WFS and its affiliates, do not control any Underlying Stock Issuer, and have not verified any disclosure made by any Underlying Stock Issuer or any other company. We, the Guarantor or one or more of our other affiliates, including BofAS, or WFS and its affiliates, may execute such purchases or sales for our own or their own accounts, for business reasons, or in connection with hedging our obligations under the Securities. These transactions may present a conflict of interest between your interest in the Securities and the interests we, the Guarantor and our other affiliates, including BofAS, and WFS and its affiliates, may have in our or their proprietary accounts, in facilitating transactions, including block trades, for our or their other customers, and in accounts under our or their management. These transactions may adversely affect the prices of the Underlying Stocks in a manner that could be adverse to your investment in the Securities. On or before the Pricing Date, any purchases or sales by us, the Guarantor or our other affiliates, including BofAS or others on its behalf, and WFS and its affiliates (including for the purpose of hedging some or all of our anticipated exposure in connection with the Securities), may affect the prices of the Underlying Stocks. Consequently, the prices of the Underlying Stocks may change subsequent to the Pricing Date, which may adversely affect the market value of the Securities.

We, the Guarantor or one or more of our other affiliates, including BofAS, and WFS and its affiliates, also expect to engage in hedging activities that could affect the prices of the Underlying Stocks on the Pricing Date. In addition, these hedging activities, including the unwinding of a hedge, may decrease the market value of your Securities prior to maturity, and may affect the amounts to be paid on the Securities. We, the Guarantor or one or more of our other affiliates, including BofAS, and WFS and its affiliates, may purchase or otherwise acquire a long or short position in the Securities and may hold or resell the Securities. For example, BofAS may enter into these transactions in connection with any market making activities in which it engages. We cannot assure you that these activities will not adversely affect the prices of the Underlying Stocks, the market value of your Securities prior to maturity or the amounts payable on the Securities.

If WFS, BofAS or an affiliate of either selling agent participating as a dealer in the distribution of the Securities conducts hedging activities for us in connection with the Securities, such selling agent or participating dealer will expect to realize a projected profit from such hedging activities, and this projected profit will be in addition to any discount, concession or fee received in connection with the sale of the

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Securities to you. This additional projected profit may create a further incentive for the selling agents or participating dealers to sell the Securities to you.

There may be potential conflicts of interest involving the calculation agent, which is an affiliate of ours. We have the right to appoint and remove the calculation agent. One of our affiliates will be the calculation agent for the Securities and, as such, will make a variety of determinations relating to the Securities, including the amounts that will be paid on the Securities. Under some circumstances, these duties could result in a conflict of interest between its status as our affiliate and its responsibilities as calculation agent.

Underlying-related Risks

Any payments on the Securities will depend upon the performance of the Underlying Stocks, and therefore the Securities are subject to the following risks, each as discussed in more detail in the accompanying product supplement.

Tax-related Risks

The U.S. federal income tax consequences of the Securities are uncertain, and may be adverse to a holder of the Securities. See "U.S. Federal Income Tax Summary" below and "U.S. Federal Income Tax Summary" beginning on page PS-36 of the accompanying product supplement.

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If the Securities are automatically called:

If the Securities are automatically called prior to the Maturity Date, you will receive the principal amount of your Securities plus a final Contingent Coupon Payment on the applicable Call Settlement Date. In the event the Securities are automatically called, your total return on the Securities will equal any Contingent Coupon Payments received prior to the Call Settlement Date and the Contingent Coupon Payment received on the Call Settlement Date.

If the Securities are not automatically called:

If the Securities are not automatically called prior to the Maturity Date, the following table illustrates, for a range of hypothetical Performance Factors of the Lowest Performing Underlying Stock on the Final Calculation Day, the hypothetical Maturity Payment Amount payable at maturity per Security (excluding the final Contingent Coupon Payment, if any). The Performance Factor of the Lowest Performing Underlying Stock on the Final Calculation Day is its Ending Price expressed as a percentage of its Starting Price (i.e., its Ending Price divided by its Starting Price).

The above figures do not take into account Contingent Coupon Payments, if any, received during the term of the Securities. As evidenced above, in no event will you have a positive rate of return based solely on the Maturity Payment Amount received at maturity; any positive return will be based solely on the Contingent Coupon Payments, if any, received during the term of the Securities.

The above figures are for purposes of illustration only and may have been rounded for ease of analysis. If the Securities are not automatically called prior to the Maturity Date, the actual amount you will receive on the Maturity Date will depend on the actual Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day. The performance of the better performing Underlying Stocks is not relevant to your return on the Securities.

PS-13

Set forth below are examples that illustrate how to determine whether a Contingent Coupon Payment will be paid and whether the Securities will be automatically called, if applicable, on a Contingent Coupon Payment Date prior to the Maturity Date. The examples do not reflect any specific Contingent Coupon Payment Date. The following examples assume that the Securities are subject to automatic call on the applicable Calculation Day. The Securities will not be subject to automatic call until the sixth Calculation Day, which is approximately six months after the issue date. The following examples reflect a hypothetical Contingent Coupon Rate of 25.00% per annum (the specified minimum Contingent Coupon Rate) and assume the hypothetical Starting Price, Coupon Barrier and stock closing price for each Underlying Stock indicated in the examples. The terms used for purposes of these hypothetical examples do not represent any actual Starting Price or Coupon Barrier. The hypothetical Starting Price of $100.00 for each Underlying Stock has been chosen for illustrative purposes only and does not represent the actual Starting Price for any Underlying Stock. The actual Starting Price and Coupon Barrier for each Underlying Stock will be determined on the Pricing Date and will be set forth under "Terms of the Securities" above in the final pricing supplement. For historical data regarding the actual Closing Prices of the Underlying Stocks, see the historical information provided herein. These examples are for purposes of illustration only and the values used in the examples may have been rounded for ease of analysis.

Example 1. The price of the Lowest Performing Underlying Stock on the relevant Calculation Day is greater than or equal to its Coupon Barrier and less than its Starting Price. As a result, investors receive a Contingent Coupon Payment on the applicable Contingent Coupon Payment Date and the Securities are not automatically called.

Step 1: Determine which Underlying Stock is the Lowest Performing Underlying Stock on the relevant Calculation Day.

In this example, the common stock of Chipotle Mexican Grill, Inc. has the lowest Performance Factor and is, therefore, the Lowest Performing Underlying Stock on the relevant Calculation Day.

Step 2: Determine whether a Contingent Coupon Payment will be paid and whether the Securities will be automatically called on the applicable Contingent Coupon Payment Date.

Since the hypothetical stock closing price of the Lowest Performing Underlying Stock on the relevant Calculation Day is greater than or equal to its Coupon Barrier, but less than its Starting Price, you would receive a Contingent Coupon Payment on the applicable Contingent Coupon Payment Date and the Securities would not be automatically called. The Contingent Coupon Payment would be equal to $20.83 per Security, determined as follows: (i) $1,000 multiplied by 25.00% per annum divided by (ii) 12, rounded to the nearest cent.

Example 2. The price of the Lowest Performing Underlying Stock on the relevant Calculation Day is less than its Coupon Barrier and its Starting Price. As a result, investors do not receive a Contingent Coupon Payment on the applicable Contingent Coupon Payment Date and the Securities are not automatically called.

Step 1: Determine which Underlying Stock is the Lowest Performing Underlying Stock on the relevant Calculation Day.

In this example, the Class A common stock of Meta Platforms, Inc. has the lowest Performance Factor and is, therefore, the Lowest Performing Underlying Stock on the relevant Calculation Day.

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Step 2: Determine whether a Contingent Coupon Payment will be paid and whether the Securities will be automatically called on the applicable Contingent Coupon Payment Date.

Since the hypothetical stock closing price of the Lowest Performing Underlying Stock on the relevant Calculation Day is less than its Coupon Barrier, you would not receive a Contingent Coupon Payment on the applicable Contingent Coupon Payment Date. In addition, because the hypothetical stock closing price of the Lowest Performing Underlying Stock also is less than its Starting Price, the Securities would not be automatically called, even though the stock closing prices of the better performing Underlying Stocks on the relevant Calculation Day are greater than their respective Starting Prices. As this example illustrates, whether you receive a Contingent Coupon Payment and whether the Securities are automatically called on a Contingent Coupon Payment Date will depend solely on the stock closing price of the Lowest Performing Underlying Stock on the relevant Calculation Day. The performance of the better performing Underlying Stocks is not relevant to your return on the Securities.

Example 3. The price of the Lowest Performing Underlying Stock on the relevant Calculation Day is greater than or equal to its Starting Price. As a result, the Securities are automatically called on the applicable Contingent Coupon Payment Date for the principal amount plus a final Contingent Coupon Payment.

Step 1: Determine which Underlying Stock is the Lowest Performing Underlying Stock on the relevant Calculation Day.

In this example, the common stock of Adobe Inc. has the lowest Performance Factor and is, therefore, the Lowest Performing Underlying Stock on the relevant Calculation Day.

Step 2: Determine whether a Contingent Coupon Payment will be paid and whether the Securities will be automatically called on the applicable Contingent Coupon Payment Date.

Since the hypothetical stock closing price of the Lowest Performing Underlying Stock on the relevant Calculation Day is greater than or equal to its Starting Price, the Securities would be automatically called and you would receive the principal amount plus a final Contingent Coupon Payment on the applicable Contingent Coupon Payment Date, which is also referred to as the Call Settlement Date. On the Call Settlement Date, you would receive $1,020.83 per Security.

You will not receive any further payments after the Call Settlement Date.

PS-15

Set forth below are examples of calculations of the Maturity Payment Amount payable on the Maturity Date, assuming that the Securities have not been automatically called prior to the Maturity Date and assuming the hypothetical Starting Price, Coupon Barrier, Threshold Price and Ending Price for each Underlying indicated in the examples. The terms used for purposes of these hypothetical examples do not represent any actual Starting Price, Coupon Barrier or Threshold Price. The hypothetical Starting Price of 100.00 for each Underlying Stock has been chosen for illustrative purposes only and does not represent the actual Starting Price for any Underlying Stock. The actual Starting Price, Coupon Barrier and Threshold Price for each Underlying Stock will be determined on the Pricing Date and will be set forth under "Terms of the Securities" above in the final pricing supplement. For historical data regarding the actual closing prices of the Underlying Stocks, see the historical information provided herein. These examples are for purposes of illustration only and the values used in the examples may have been rounded for ease of analysis.

Example 1. The Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is greater than its Starting Price, the Maturity Payment Amount is equal to the principal amount of your Securities at maturity and you receive a final Contingent Coupon Payment:

Step 1: Determine which Underlying Stock is the Lowest Performing Underlying Stock on the Final Calculation Day.

In this example, the common stock of Chipotle Mexican Grill, Inc. has the lowest Performance Factor and is, therefore, the Lowest Performing Underlying Stock on the Final Calculation Day.

Step 2: Determine the Maturity Payment Amount based on the Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day.

Since the hypothetical Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is greater than its hypothetical Threshold Price, the Maturity Payment Amount would equal the principal amount. Although the hypothetical Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is significantly greater than its hypothetical Starting Price in this scenario, the Maturity Payment Amount will not exceed the principal amount.

In addition to any Contingent Coupon Payments received during the term of the Securities, on the Maturity Date you would receive $1,000 per Security. In addition, because the hypothetical Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is greater than its Coupon Barrier, you would receive a final Contingent Coupon Payment on the Maturity Date.

Example 2. The Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is less than its Starting Price but greater than its Threshold Price and its Coupon Barrier, the Maturity Payment Amount is equal to the principal amount of your Securities at maturity and you receive a final Contingent Coupon Payment:

Step 1: Determine which Underlying Stock is the Lowest Performing Underlying Stock on the Final Calculation Day.

PS-16

In this example, the Class A common stock of Meta Platforms, Inc. has the lowest Performance Factor and is, therefore, the Lowest Performing Underlying Stock on the Final Calculation Day.

Step 2: Determine the Maturity Payment Amount based on the Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day.

Since the hypothetical Ending Price of the Lowest Performing Underlying Stock is less than its hypothetical Starting Price, but not by more than 30%, you would be repaid the principal amount of your Securities at maturity.

In addition to any Contingent Coupon Payments received during the term of the Securities, on the Maturity Date you would receive $1,000 per Security. In addition, because the hypothetical Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is greater than its Coupon Barrier, you would receive a final Contingent Coupon Payment on the Maturity Date.

Example 3. The Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is less than its Threshold Price and its Coupon Barrier, the Maturity Payment Amount is less than the principal amount of your Securities at maturity and you do not receive a final Contingent Coupon Payment:

Step 1: Determine which Underlying Stock is the Lowest Performing Underlying Stock on the Final Calculation Day.

In this example, the common stock of Adobe Inc. has the lowest Performance Factor and is, therefore, the Lowest Performing Underlying Stock on the Final Calculation Day.

Step 2: Determine the Maturity Payment Amount based on the Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day.

Since the hypothetical Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is less than its hypothetical Starting Price by more than 30%, you would lose a portion of the principal amount of your Securities and receive the Maturity Payment Amount equal to $450.00 per Security, calculated as follows:

= $1,000 × Performance Factor of the Lowest Performing Underlying Stock on the Final Calculation Day

= $1,000 × 45.00%

= $450.00

In addition to any Contingent Coupon Payments received during the term of the Securities, on the Maturity Date you would receive $450.00 per Security. Because the hypothetical Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is less than its Coupon Barrier, you would not receive a final Contingent Coupon Payment on the Maturity Date.

These examples illustrate that you will not participate in any appreciation of any Underlying Stock, but will be fully exposed to a decrease in the Lowest Performing Underlying Stock if the Ending Price of the Lowest Performing Underlying Stock on the Final Calculation Day is less than its Threshold Price, even if the Ending Prices of the other Underlying Stocks have appreciated or have not declined below their respective Threshold Prices.

To the extent that the Starting Price, Coupon Barrier, Threshold Price and Ending Price of the Lowest Performing Underlying Stock differ from the values assumed above, the results indicated above would be different.

PS-17

All disclosures contained in this pricing supplement regarding the Underlying Stocks and the Underlying Stock Issuers, have been derived from publicly available sources. Because the Underlying Stocks are registered under the Securities Exchange Act of 1934, the Underlying Stock Issuers are required to periodically file certain financial and other information specified by the Securities and Exchange Commission (SEC). Information provided to or filed with the SEC by the Underlying Stock Issuers can be located through the SEC's website at sec.gov by reference to the applicable CIK numbers set forth below. This document relates only to the offering of the Securities and does not relate to any offering of Underlying Stock or any other securities of the Underlying Stock Issuers. None of us, the Guarantor, BofAS or any of our other affiliates has made any due diligence inquiry with respect to the Underlying Stock Issuers in connection with the offering of the Securities. None of us, the Guarantor, BofAS or any of our other affiliates has independently verified the accuracy or completeness of the publicly available documents or any other publicly available information regarding the Underlying Stock Issuers and hence makes no representation regarding the same. Furthermore, there can be no assurance that all events occurring prior to the date of this document, including events that would affect the accuracy or completeness of these publicly available documents that could affect the trading prices of the Underlying Stocks, have been or will be publicly disclosed. Subsequent disclosure of any events or the disclosure of or failure to disclose material future events concerning an Underlying Stock Issuer could affect the price of the applicable Underlying Stock and therefore could affect your return on the Securities. The selection of the Underlying Stocks is not a recommendation to buy or sell the Underlying Stocks.

None of us, the Guarantor, BofAS or any of our other affiliates makes any representation to you as to the future performance of the Underlying Stocks. You should make your own investigation into the Underlying Stocks.

The Class A Common Stock of Meta Platforms, Inc.

Meta Platforms, Inc. operates as a social technology company. The company builds applications and technologies that help people connect, find communities, and grow businesses. The company is also involved in advertisements and augmented and virtual reality. This Underlying Stock trades on the Nasdaq Global Select Market under the symbol "META." The company's CIK number is 0001326801 and its SEC file number is 001-35551.

Historical Information

The following graph sets forth the daily historical performance of META in the period from January 2, 2020 through November 3, 2025. 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. The horizontal line in the graph represents META's hypothetical Coupon Barrier and hypothetical Threshold Price of $446.397, which is 70.00% of META's hypothetical Starting Price of $637.71, which was its closing price on November 3, 2025. The actual Starting Price, Coupon Barrier and Threshold Price will be determined on the Pricing Date.

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

Before investing in the Securities, you should consult publicly available sources for the trading patterns and prices of META.

PS-18

The Common Stock of Adobe Inc.

Adobe Inc. develops, markets, and supports computer software products and technologies. The company's products allow users to express and use information across all print and electronic media. The company offers a line of application software products, type products, and content for creating, distributing, and managing information. The company serves customers worldwide. This Underlying Stock trades on the Nasdaq Global Select Market under the symbol "ADBE". The company's CIK number is 0000796343 and its SEC file number is 000-15175.

Historical Information

The following graph sets forth the daily historical performance of ADBE in the period from January 2, 2020 through November 3, 2025. 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. The horizontal line in the graph represents ADBE's hypothetical Coupon Barrier and hypothetical Threshold Price of $236.229, which is 70.00% of ADBE's hypothetical Starting Price of $337.47, which was its closing price on November 3, 2025. The actual Starting Price, Coupon Barrier and Threshold Price will be determined on the Pricing Date.

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

Before investing in the Securities, you should consult publicly available sources for the trading patterns and prices of ADBE.

PS-19

The Common Stock of Chipotle Mexican Grill, Inc.

Chipotle Mexican Grill, Inc. owns and operates Mexican restaurants. The company offers burritos, burrito bowls, quesadillas, tacos, and salads. The company serves customers primarily in the United States. This Underlying Stock trades on the NYSE under the symbol "CMG". The company's CIK number is 0001058090 and its SEC file number is 001-32731.

Historical Information

The following graph sets forth the daily historical performance of CMG in the period from January 2, 2020 through November 3, 2025. 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. The horizontal line in the graph represents CMG's hypothetical Coupon Barrier and hypothetical Threshold Price of $22.057, which is 70.00% of CMG's hypothetical Starting Price of $31.51, which was its closing price on November 3, 2025. The actual Starting Price, Coupon Barrier and Threshold Price will be determined on the Pricing Date.

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

Before investing in the Securities, you should consult publicly available sources for the trading patterns and prices of CMG.

PS-20

The Securities are our debt securities, the return on which is linked to the performance of the Underlying Stocks. The related guarantee is BAC's obligation. Any payments on the Securities, including payment of the Maturity Payment Amount, depend on the credit risk of BofA Finance and BAC and on the performance of the Underlying Stocks. As is the case for all of our and BAC's respective debt securities, including our market-linked securities, the economic terms of the Securities reflect our and BAC's actual or perceived creditworthiness at the time of pricing. In addition, because market-linked securities result in increased operational, funding and liability management costs to us and BAC, BAC typically borrows the funds under these types of securities at a rate, which we refer to in this pricing supplement as BAC's internal funding rate, that is more favorable to BAC than the rate that it might pay for a conventional fixed or floating rate debt security. This generally relatively lower internal funding rate, which is reflected in the economic terms of the Securities, along with the fees and charges associated with market-linked securities, typically results in the initial estimated value of the Securities on the Pricing Date being less than their public offering price.

The initial estimated value range of the Securities is set forth on the cover page of this preliminary pricing supplement. The final pricing supplement will set forth the initial estimated value of the Securities as of the Pricing Date.

In order to meet our payment obligations on the Securities, at the time we issue the Securities, we may choose to enter into certain hedging arrangements (which may include call options, put options or other derivatives) with BofAS or one of our other affiliates. The terms of these hedging arrangements are determined based upon terms provided by BofAS and its affiliates, and take into account a number of factors, including our and BAC's creditworthiness, interest rate movements, the volatility of the Underlying Stocks, the tenor of the Securities and the hedging arrangements. The economic terms of the Securities and their initial estimated value depend in part on the terms of these hedging arrangements.

BofAS has advised us that the hedging arrangements will include hedging related charges, reflecting the costs associated with, and our affiliates' profit earned from, these hedging arrangements. Since hedging entails risk and may be influenced by unpredictable market forces, actual profits or losses from these hedging transactions may be more or less than any expected amounts.

For further information, see "Selected Risk Considerations" beginning on page PS-9 above and "Use of Proceeds" on page 17 of the accompanying prospectus.

PS-21

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

You should consult your own tax advisor concerning the U.S. federal income tax consequences to you of acquiring, owning, and disposing of the Securities, 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-36 of the accompanying product supplement.

PS-22