美国银行美股招股说明书(2026-03-23版)

Preliminary Pricing Supplement - Subject to Completion(To Prospectus dated December 8, 2025,Series A Prospectus Supplement dated December 8, 2025 andProduct Supplement STOCK-1 dated December 8, 2025) Auto-Callable Notes Fully and Unconditionally Guaranteed by Bank of America Corporation Linked to the Common Stock of JPMorgan Chase & Co.• The Auto-Callable Notes Linked to the Common Stock of JPMorgan Chase & Co., due April 7, 2031 (the “Notes”) are expected to price on April 2,2026 and expected to issue on April 8, 2026.•Approximate 5 year term if not called prior to maturity.•Payment on the Notes will depend on the performance of the common stock of JPMorgan Chase & Co. (the “Underlying Stock”).•Beginning with the April 12, 2027 Call Observation Date, automatically callable monthly for an amount equal to the applicable Call Amount if, onthe applicable Call Observation Date, the Observation Value of the Underlying Stock is equal to or greater than the Call Value. The CallObservation Dates and Call Amounts are indicated on page PS-4.•Assuming the Notes are not called prior to maturity, if the Ending Value of the Underlying Stock is greater than or equal to 100% of its StartingValue, at maturity, you will receive $1,765.00 per $1,000.00 in principal amount of your Notes.•However, assuming the Notes are not called prior to maturity, if the Underlying Stock declines by more than 30% from its Starting Value, atmaturity your investment will be subject to 1:1 downside exposure to decreases in the value of the Underlying Stock, with up to 100% of theprincipal at risk. Otherwise, if the Notes are not called prior to maturity and the Ending Value of the Underlying Stock is less than 100.00% of itsStarting Value but greater than or equal to 70% of its Starting Value, at maturity you will receive the principal amount of your Notes.•Any payment on the Notes is subject to the credit risk of BofA Finance LLC (“BofA Finance” or the “Issuer”), as issuer of the Notes, and Bank ofAmerica Corporation (“BAC” or the “Guarantor”), as guarantor of the Notes.•No periodic interest payments.•The Notes will not be listed on any securities exchange.•CUSIP No. 09711Q4S9. The initial estimated value of the Notes as of the pricing date is expected to be between $920.00 and $980.00 per $1,000.00 in principal amountof Notes, which is less than the public offering price listed below.The actual value of your Notes at any time will reflect many factors and cannot bepredicted with accuracy. See “Risk Factors” beginning on page PS-9 of this pricing supplement and “Structuring the Notes” on page PS-15 of this pricingsupplement for additional information. There are important differences between the Notes and a conventional debt security. Potential purchasers of the Notes should consider theinformation in “Risk Factors” beginning on page PS-9 of this pricing supplement, page PS-4 of the accompanying product supplement, pageS-7 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 ordisapproved of these securities or determined if this pricing supplement and the accompanying product supplement, prospectus supplement andprospectus is truthful or complete. Any representation to the contrary is a criminal offense. (1)Certain dealers who purchase the Notes for sale to certain fee-based advisory accounts may forgo some or all of their selling concessions, fees orcommissions. The public offering price for investors purchasing the Notes in these fee-based advisory accounts may be as low as $997.00 per$1,000.00 in principal amount of Notes.(2)The underwriting discount per $1,000.00 in principal amount of Notes may be as high as $3.00, resulting in proceeds, before expenses, to BofA Finance of as low as $997.00 per $1,000.00 in principal amount of Notes.The Notes and the related guarantee: Selling Agent Auto-Callable Notes Linked to the Common Stock of JPMorgan Chase & Co. Terms of the Notes Auto-Callable Notes Linked to the Common Stock of JPMorgan Chase & Co. * The Call Observation Dates are subject to postponement as set forth in “Description of the Notes—Certain Terms of the Notes—Events Relating toObservation Dates” on page PS-18 of the accompanying product supplement, with references to “Observation Dates” being read as references to “CallObservation Dates.” Any payments on the Notes depend on the credit risk of BofA Finance, as Issuer, and BAC, as Guarantor, and on the performance of the UnderlyingStock. The economic terms of the Notes are based on BAC’s internal funding rate, which is the rate it would pay to borrow funds through the issuance ofmarket-linked notes, and the economic terms of certain related hedging arrangements BAC’s affiliates enter into. BAC’s internal funding rate is typicallylower than the rate it would pay when it issues conventional fixed or floating