FORM6-K
U.S. SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

REPORT OF FOREIGNPRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 OF THE
SECURITIES EXCHANGE ACT OF 1934

dated August29, 2025

Commission File Number1-15148

BRFS.A.
(Exact Name as Specified in its Charter)

N/A
    (Translation of Registrant’sName)

14401AV. DAS NACOES UNIDAS 22ND FLOOR
CHAC SANTO ANTONIO 04730 090-São Paulo – SP, Brazil
    (Address of principal executive offices)(Zip code)

Indicate by check markwhether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F x  Form 40-F o

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This material includescertain forward-looking statements that are based principally on current expectations and on projections of future events and financialtrends that currently affect or might affect the Company’s business, and are not guarantees of future performance.  These forward-lookingstatements are based on management’s expectations, which involve a number of known and unknown risks, uncertainties, assumptionsand other important factors, many of which are beyond the Company’s control and any of which could cause actual financial conditionand results of operations to differ materially from those set out in the Company’s forward-looking statements.  You are cautionednot to put undue reliance on such forward-looking statements.  The Company undertakes no obligation, and expressly disclaims anyobligation, to update or revise any forward-looking statements.  The risks and uncertainties relating to the forward-looking statementsin this Report on Form 6-K, including Exhibit 1 hereto, include those described under the captions “Forward-Looking Statements”and “Item 3. Key Information — D. Risk Factors” in the Company’s annual report on Form 20-F for the year endedDecember 31, 2024.

SIGNATURES

After due inquiry and to the best of my knowledge andbelief, I certify that the information set forth in this statement is true, complete and correct.

 EXHIBIT INDEX

Exhibit 99.1

 Thisbusiness combination involves the securities of a Brazilian company. The business combination is subject to disclosure requirements ofBrazil that are different from those of the United States. Financial statements included in the document, if any, have been prepared inaccordance with foreign accounting standards that may not be comparable to financial statements of United States companies.

 It may be difficult for you to enforce your rights andany claim you may have arising under the U.S. federal securities laws, since the issuer is located in Brazil, and some or all of its officersand directors may be residents of Brazil. You may not be able to sue a Brazilian company or its officers or directors in a Brazilian courtfor violations of the U.S. securities laws. It may be difficult to compel a Brazilian company and its affiliates to subject themselvesto a U.S. court’s judgment.

 You should be aware that the issuer may purchase securitiesotherwise than under the exchange offer, such as in open market or privately negotiated purchases.

BRF S.A.
Publicly Trade Company

CNPJ/MF No. 01.838.723/0001-27

NIRE 42.300.034.240

NOTICE TO SHAREHOLDERS
Tax Treatment of Shareholders as a Result of the Withdrawal Exercise

BRF S.A. ("BRF" or "Company"),following the material fact disclosed on August 5, 2025, which informed the approval by the Company's Extraordinary General Meeting heldon the same date ("Meeting") of the merger of shares issued by BRF by Marfrig Global Foods S.A. ("Marfrig")(the “Merger of Shares"), the consummation of which is subject to the satisfaction (or waiver, as the case may be) ofcertain conditions precedent set forth in the "Plan of Merger of Shares Issued by BRF S.A. by Marfrig Global Foods S.A..", enteredinto on May 15, 2025, as amended on May 26, 2025 ("Plan of Merger"), and the advent of the Closing Date (as defined inthe Plan of Merger), to present to its shareholders information related to the tax treatment to be given to the Dissenting Shareholders(as defined below) as a result of the exercise of the Withdrawal Right (as defined below), as well as to request the Dissenting Shareholdersnot resident in Brazil to provide certain information necessary to comply with the Company's legal duties under applicable tax laws andregulations.

1               Exercising the Withdrawal Right.

Due to the Company's legal responsibilityfor withholding and payment of Withholding Income Tax ("IRRF") levied on potential gains earned by Dissenting Shareholdersnot resident in Brazil, as established in the applicable legislation, the Company will retain part of the amount due to such shareholdersas reimbursement for the Withdrawal Right, in an amount corresponding to the IRRF related to any capital gain earned by such investors.

The calculation basis for the WHTwill be the capital gain of the respective Dissenting Shareholder, corresponding to the positive difference, if any, between (i) theamount of the reimbursement, as detailed in item 1.2, above; and (ii) the cost of acquisition of the shares issued by the Company fromeach non-resident Dissident Shareholder. The WHT will be withheld and collected by the Company in accordance with the legal and regulatoryrules applicable to each type of investor not resident in Brazil, observing the rates of 15% to 22.5%, or the rate of 25% in the caseof a shareholder who is resident in Favorable Tax Jurisdiction (i.e. juridisction that (i) does not impose any tax on income; (ii) imposesincome tax at a maximum rate lower than 17%; or (iii) imposes restrictions on the disclosure of ownership composition or securitiesownership or does not allow for the identification of the beneficial owners of the earnings that are attributed to non-residents).

The Company reserves the right to offsetthe amount collected as WHT from each Dissident Shareholder not resident in Brazil against any credits held by the Company against therespective investors.

In order to enable the calculationof any capital gain, the Dissenting Shareholders who are not resident in Brazil must fill out and deliver electronically to the Company,directly or through their respective custodians, the information contained in Exhibit I to this notice to shareholders,containing data about the non-resident shareholders, including the cost of acquisition of the shares issued by the Company and their taxresidence, and provide the corresponding supporting documentation. The information contained in Exhibit I to this noticeto shareholders must be completed and made available by the shareholder through the form to be accessed through the link https://brf.softexpert.com/se/v87978/survey/s.php?token=d18b404bd323fbac4f38f10649964c3a&se-guestsession-token=4154be452da8724bda292882d453a1616139.

The information filled out in the formas acquisition cost must be accompanied by reliable and adequate supporting documentation (for example, broker statements), which shouldalso be attached to the form. Such information and documents must be submitted in accordance with the instructions contained herein by6:00 p.m. (BRT) on 10 September, 2025. The Company may, at its sole discretion, request additional information and/or documentswhenever it deems necessary for full compliance with its legal obligations as a tax liable.

The Company will use the informationprovided to it in the form above to calculate the capital gain and the WHT, and the shareholders will be responsible for the veracityand completeness of such information and documents. The Company (i) will consider the acquisition cost to be equal to zero for non-residentDissenting Shareholders who do not forward the amount of the acquisition cost of the shares issued by the Company, or who submit the informationand/or supporting documentation in an inadequate, insufficient or untimely manner; and (ii) it will apply the rate of 25% on the capitalgains of Dissenting Shareholders not resident in Brazil who, within the same period, fail to inform their country or dependence of residenceor tax domicile, all in accordance with the legislation and regulations of the Federal Revenue Service of Brazil.

By providing the information mentionedabove, the Shareholders and their Custody Agents authorize the availability of the data submitted, as well as any additional informationthat may be subsequently requested by the Company to the tax authorities in inspection proceedings.

The Company will keep its respective shareholders and the marketinformed about the development of the Merger of Shares and other matters hereunder, including the result of the Withdrawal Right and theconditions and deadlines applicable to the payment of the refund amount, if applicable.

São Paulo, August 29, 2025.

ANNEX I

ACQUISITIONCOST INFORMATION^[1]

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IMPORTANT NOTICE

This communication is not an offering document and does not constitutean offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval.

Investors in American Depositary Shares (“ADSs”) ofBRF and holders of common shares of BRF are urged to read the informational document regarding the merger between BRF and Marfrig becauseit will contain important information.

U.S. holders of common shares of BRF are urged to read any informationaldocument or other materials prepared by BRF for common shareholders of BRF regarding the merger because they will contain important information.BRF expects to submit copies of these documents to the U.S. Securities and Exchange Commission (“SEC”) when they are available,and investors and security holders may obtain free copies of these documents and other documents filed by the Companies with the SEC atthe SEC’s website at www.sec.gov.

A copy of any informational documents prepared for holders of ADRsor U.S. holders of common shares of BRF (when available) may also be obtained for free from Marfrig.

This communication contains forward-looking statements. These statementsare statements that are not historical facts and are based on the current view and estimates of management of BRF and Marfrig of futureeconomic circumstances, industry conditions, company performance and financial results. The words “anticipates,” “believes,”“estimates,” “expects,” “plans” and similar expressions, as they relate to the Companies, are intendedto identify forward-looking statements.

Statements regarding the structure and timing of any merger betweenthe Companies, business strategies, future synergies, future costs and future liquidity of the Companies, and pro forma results of operationsand financial condition of the Companies are examples of forward-looking statements.

Such statements reflect the current views of management and aresubject to a number of risks and uncertainties, including economic and market conditions in Brazil and globally, conditions in the industryof the Companies, any regulatory actions relating to the merger, the ability of the Companies to achieve projected synergies and the riskfactors outlined by each of the Companies in their filings with the SEC and the Brazilian Securities Commission (CVM). There is no guaranteethat the expected events, trends or results will actually occur.

Any changes in the assumptions and factors on which these forward-lookingstatements are based could cause actual results to differ materially from current expectations.