美国银行美股招股说明书(2025-10-10版)

This pricing supplement, which is not complete and may be changed, relates to an effective Registration Statement under the Securities Act of 1933. Thispricing supplement and the accompanying product supplement, prospectus supplement and prospectus are not an offer to sell these Notes in any country orjurisdiction where such an offer would not be permitted. Linked to the Least Performing of the Russell 2000®Index and the S&P 500®Index The Auto-Callable Notes Linked to the Least Performing of the Russell 2000®Index and the S&P 500®Index, due November 3, 2028 (the “Notes”) are expectedto price on October 31, 2025 and expected to issue on November 5, 2025. Approximate 3 year term if not called prior to maturity. •Beginning with the November 2, 2026 Call Observation Date, automatically callable annually for an amount equal to the applicable Call Amount if, on theapplicable Call Observation Date, the Observation Value of each Underlying is equal to or greater than its Call Value. The Call Observation Dates and CallAmounts are indicated on page PS-4. Assuming the Notes are not called prior to maturity, if the Ending Value of each Underlying is greater than or equal to 100% of its Starting Value, at maturity, youwill receive $1,340.50 per $1,000.00 in principal amount of your Notes. •However, assuming the Notes are not called prior to maturity, ifeitherUnderlying declines by more than 40% from its Starting Value, at maturity your investmentwill be subject to 1:1 downside exposure to decreases in the value of the Least Performing Underlying, with up to 100% of the principal at risk. Otherwise, if theNotes are not called prior to maturity and the Ending Value of the Least Performing Underlying is less than 100.00% of its Starting Value but greater than or equalto 60% 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 of AmericaCorporation (“BAC” or the “Guarantor”), as guarantor of the Notes. The initial estimated value of the Notes as of the pricing date is expected to be between $940.00 and $990.00 per $1,000.00 in principal amount ofNotes, 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-20of this pricingsupplement for additional information.There are important differences between the Notes and a conventional debt security. Potential purchasers of the Notes should consider the information in “Risk Factors” beginning on page PS-9of this pricing supplement, page PS-5 of the accompanying product supplement, page S-6 ofthe 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 orcomplete. Any representation to the contrary is a criminal offense. In addition to the underwriting discount above, if any, an affiliate of BofA Finance will pay a referral fee of up to $12.00 per $1,000.00 in principal amount ofthe Notes in connection with the distribution of the Notes to other registered broker-dealers. Selling Agent Auto-Callable Notes Linked to the Least Performing of the Russell 2000®Index and the S&P 500®Index Terms of the Notes Call Observation Dates, Call Payment Dates and Call Amounts * 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” beginning on page PS-23 of the accompanying product supplement, with references to “Observation Dates” being read as references to“Call Observation 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 Underlyings. Theeconomic 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 of market-linkednotes, and the economic terms of certain related hedging arrangements BAC’s affiliates enter into. BAC’s internal funding rate is typically lower than the rate itwould pay when it issues conventional fixed or floating rate debt securities. This difference in funding rate, as well as the underwriting discount, if any, thereferral fee and the hedging related charges described below (see “Risk Factors” beginning on page PS-9), will reduce the economic terms of the Notes to youand the initial estimated value of the Notes. Due to these factors, the public offering price you pay to purchase the Notes w