SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer
Pursuant to Rule 13a-16 or 15d-16 of the

Securities Exchange Act of 1934

For the month of October, 2026

Commission File Number 1565025

AMBEV S.A.

(Exact name of registrant as specified in its charter)

AMBEV S.A.

(Translation of Registrant's name into English)

Rua Dr. Renato Paes de Barros, 1017 - 3rd Floor
04530-000 São Paulo, SP
Federative Republic of Brazil

(Address of principal executive office)

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

Form 20-F ___X___ Form 40-F _______

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes _______ No ___X____

Contents

INTERIM CONSOLIDATED BALANCE SHEET

All amounts in thousands of Brazilian Reais

The accompanying notes are an integral part of these interim consolidated financial statements.

INTERIM CONSOLIDATED BALANCE SHEET (CONTINUED)

All amounts in thousands of Brazilian Reais

The accompanying notes are an integral part of these interim consolidated financial statements.

INTERIM CONSOLIDATED INCOME STATEMENT

For the nine and three-month periods ended September 30

All amounts in thousands of Brazilian Reais unless otherwise stated

(i) As from the fourth quarter of 2025, the other financial income and other financial expense line items, which had previously been presented separately, were combined into the line item “Other net financial results”. The same treatment has been applied on a comparative basis.

The accompanying notes are an integral part of these interim consolidated financial statements.

INTERIM CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

For the nine and three-month periods ended September 30

All amounts in thousands of Brazilian Reais

The consolidated statement of comprehensive income is presented net of income tax. The income tax effects of these items are disclosed in note 8 –Income tax and social contribution.

The accompanying notes are an integral part of these interim consolidated financial statements.

INTERIM CONSOLIDATED STATEMENT OF CHANGES IN EQUITY

For the nine-month periods ended September 30

All amounts in thousands of Brazilian Reais

The accompanying notes are an integral part of these interim consolidated financial statements.

INTERIM CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (CONTINUED)

For the nine-month periods ended September 30

All amounts in thousands of Brazilian Reais

The accompanying notes are an integral part of these interim consolidated financial statements.

INTERIM CONSOLIDATED STATEMENT OF CASH FLOWS

For the nine and three-month periods ended September 30

All amounts in thousands of Brazilian Reais

The accompanying notes are an integral part of these interim consolidated financial statements.

1.1 Description of business

Ambev S.A. (referred to as the “Company” or “Ambev”) together with its subsidiaries (the “Group” or “Consolidated”), headquartered in São Paulo, São Paulo State, Brazil, has as its corporate purpose the production and sale of beer, draft beer, soft drinks, other non-alcoholic beverages, malt and food in general, either directly or through participation in other companies, as well as the advertising of both its own and of third party products, the sale of promotional and advertising materials, and the direct or indirect exploitation of bars, restaurants, snack bars and similar establishments, among others.

The Group’s main own brands are Brahma®, Skol®, Antarctica®, Original®, Quilmes®, Andes Origen®, Patricia®, Paceña®, Huari®, Pilsen®, Presidente®, Balboa®, Guaraná Antarctica® and Beats® among others. The main licensed brands by Anheuser-Busch InBev N.V. (“AB InBev”) to the Group are Budweiser®, Corona®, Spaten®, Stella Artois®, Beck’s®, Modelo®, Bud Light®, Busch® and Michelob Ultra® among others. In addition, the Company is one of the largest independent bottlers of PepsiCo in the world. The Group produces, sells and distributes in Brazil and in other countries in Latin America, products such as Pepsi®, H2OH! ®, Lipton IceTea® and the sports drink Gatorade® under a license from PepsiCo. The Group also has a licensing agreement with Red Bull® and other companies to distribute of its portifolio some sales channels and specific regions in Brazil and other markets.

The Company’s shares and American Depositary Receipts (“ADRs”) are listed on the Brasil, Bolsa, Balcão S.A. (“B3”) exchange under the ticker “ABEV3” as well as on the New York Stock Exchange (“NYSE”) under the ticker “ABEV”, respectively. The Company’s direct controlling shareholders are Interbrew International GmbH (“ITW International”), and AmBrew S.à.r.l (“Ambrew”), both of which are subsidiaries of AB InBev.

1.2 Key operating countries

The Company operates its business across four reportable segments based on the geographical zones shown below:

1.3 Major corporate events in the three-month period ended September 30, 2026

1.3.1 Resolution on the payment date of the third and final installment of IOC December 2025

At a meeting held on July 29, 2026, the Board of Directors approved the payment date of the third and final installment of the interest on capital, the distribution of which had been approved at the Board of Directors' meeting held on December 9, 2025 ("IOC December 2025"). The payment was made on October 6, 2026, in the gross amount of R$0.1185 per share, corresponding to an estimated net amount of R$0.1007 per share of the Company, after the withholding income tax in accordance with applicable tax legislation, totaling an aggregate gross amount of approximately R$1.9 billion. The record dates considered at the time the distribution was approved remain unchanged.

1.3.2 Distribution of IOC July 2026

At a meeting held on July 29, 2026, the Board of Directors approved the distribution of interest on capital in the gross amount of R$0.0713 per share, corresponding to an estimated net amount of R$0.0588 per share of the Company, after the withholding of income tax, in accordance with applicable legislation, totaling an aggregate gross amount of approximately R$ 1.1 billion ("IOC July 2026"). The July 2026 IOC was offset against the mandatory minimum dividend for the fiscal year and calculated based on the profit for the period and the available balances reflected in the extraordinary balance sheet dated June 30, 2026. The distribution of the July 2026 IOC was taxed in accordance with the legislation in force. Such payment will be made by December 31, 2026, on a date to be determined by the Company's Management, based on the shareholder position as of September 21, 2026, with respect to B3 S.A. – Brasil, Bolsa, Balcão, and September 23, 2026, with respect to the New York Stock Exchange (NYSE), without monetary adjustment. The Company's shares and ADRs were trade ex-IOC beginning on September 22, 2026 (including).

1.3.3 Completion of the Share Buyback Program and Cancellation of Shares

In October 2025, the Board of Directors approved a share buyback program for the Company's own shares, up to the limit of 208,000,000 common shares, with the primary purpose of cancelation, and the shares not canceled may be held in treasury, transferred and/or used to cover any share delivery requirements contemplated in the Company's share-based compensation plans.

In August 2026, the Company completed aforementioned program, having acquired all of the shares contemplated thereunder, for a total acquisition cost of R$ 3,333 million. Additionally, at a meeting held on August 12 and 13, 2026, the Board of Directors, in line with the primary objective of the share buyback program, approved the cancellation of 279,000,000 registered common shares, in book-entry form and with no par value, issued by the Company and held in treasury, with no reduction in the Company’s share capital.

1.3.4 Completion of the third tranche – Sale of subsidiary

On December 26, 2024, the Company's subsidiary, Cervecería Nacional Dominicana, S.A. ("CND"), and Koscab Holdings Limited ("Koscab") entered into a Share Purchase Agreement (“Agreement”) pursuant to which CND agreed to transfer to Koscab its entire equity interest in SLU Beverages LTD. ("SLU"). SLU is the majority shareholder of Banks Holdings Limited, Saint Vincent Brewery Limited, Antigua Brewery Limited, and Dominica Brewery & Beverages Limited, all of which were part of the CAC reportable segment.

The transfer of the entire interest will be made in up to five tranches, with maturities through 2028, in consideration of a minimum estimated amount of US$186 million, equivalent, for reference purposes, to R$964 million. The first two tranches were completed on July 31, 2025, with the transfer of 61.72% of CND's interest in SLU. In August 2026, the third tranche was completed, corresponding to the transfer of an additional 12.76%. As a result, as of September 30, 2026, CND had transferred to Koscab 74.48% of its interest in SLU, for an accumulated amount of US$139 million, equivalent to R$720 million.

The loss of control over SLU occurred in July 2025, following the completion of the first two tranches. Consequently, the Group ceased to consolidate SLU as of that date and recognized, for the nine-month period ended September 30, 2025, a gain of R$884 million under exceptional items as further detailed in note 17 – Exceptional items.

This amount included reclassification to the profit or loss of accumulated foreign exchange differences related to SLU, previously recognized in other comprehensive income in equity, in line with IAS 21 – The Effects of Changes in Foreign Exchange Rates.

As of September 30, 2026, the remaining 25.52% interest, to be transferred in subsequent tranches, was recorded in the amount of R$247.7 million under assets held for sale in the balance sheet, in accordance with IFRS 5 – Non-current Assets Held for Sale and Discontinued Operations.

The interim consolidated financial statements at September 30, 2026 have been prepared using the going concern basis of accounting and are being presented in accordance with IAS 34 – Interim Financial Reporting as issued by the International Accounting Standards Board (“IASB®”).

The information does not meet all disclosure requirements for the presentation of full annual consolidated financial statements and are disclosed with relevant information and changes in the period, without the level of detail in certain notes previously disclosed, avoiding repetition. In Management's view the interim consolidated financial statements provide sufficient understanding of the Company's equity position and performance during the interim period. Therefore, it should be read in conjunction with the consolidated financial statements for the year ended December 31, 2025, prepared in accordance with International Financial Reporting Standards (“IFRS®”) issued by the IASB®.

The following notes are not disclosed in the interim consolidated financial statements:

In addition, the material accounting policies presented in the respective accompanying notes are not disclosed in these interim consolidated financial statements. The following notes are not in the same level of detail presented in the annual consolidated financial statements, for the year ended December 31, 2025:

In preparing the interim consolidated financial statements, management uses judgments, estimates and assumptions that affect the application of accounting practices and the reported amounts of assets, liabilities, income and expenses. The relevant estimates and judgments are disclosed in note 4 - Use of estimates and judgments.

The interim consolidated financial statements relating to the period ended September 30, 2026 were approved by the Executive Board of Officers on October 28, 2026.

2.1 Functional and presentation currency

The functional and presentation currency of the Company interim consolidated financial statements is the Brazilian Real, which is the currency of its main economic operating environment. For presentation purposes, the interim consolidated financial statements are presented in thousands of Brazilian Reais (“R$”), unless otherwise indicated, and the balances are rounded to the nearest thousand.

2.1.1 Exchange rates

The most significant exchange rates used for the preparation of the Company’s interim consolidated financial statements are as follow:

The accounting practices adopted by the Company are consistent for all the years and periods presented. There were no changes to the accounting policies or calculation methods used for the interim consolidated financial statements at September 30, 2026 compared to those used for the consolidated financial statements for the years ended December 31, 2025.

3.1 Recently issued IFRS

The amendments and new standards that became effective in 2026 were either not applicable to, or did not have a material impact on, these interim separate and consolidated financial statements, as summarized below.

The following is the main change in accounting standard that, based on Management's assessment, will have an impact on the Company's disclosures in subsequent periods.

Beyond the above, the Company does not anticipate that any other standards or amendments to IFRS® standards or IFRIC® interpretations that have not yet come into force could have a material impact on the Group's financial statements. The Company has not opted for the early adoption of any standards.

3.1.1 IFRS 18 - Presentation and Disclosure in Financial Statements

In April 2024, the IASB issued IFRS 18 Presentation and Disclosures in Financial Statements, which replaces IAS 1 and introduces new requirements aimed at improving the comparability of financial performance reporting and enhancing the transparency of the information provided to users. IFRS 18 is effective for annual reporting periods beginning on or after 1 January 2027, with early adoption permitted. The standard is required to be applied retrospectively.

While IFRS 18 does not affect the recognition or measurement of assets, liabilities, income or expenses, it’s expected to have a significant impact on the presentation of the primary financial statements and the related disclosures. IFRS 18 introduces new requirements to:

The company anticipates that the adoption of the standard will primarily affect the presentation of the statement of profit or loss and the statement of cash flows, the disclosure of management performance measures, and the structure of the related notes.

The company does not intend to early adopt IFRS 18 and is currently in the process of preparing for the impacts arising from its application to the individual and consolidated financial statements. The Company has assessed that the main change in presentation will be the reclassification of foreign exchange gains and losses and gains and losses on certain hedging instruments from “financial income and expenses,” as presented under IAS 1, to “operating profit,” as required under IFRS 18, when the underlying exposure measured or hedged is related to operating activities.

The preparation of interim consolidated financial statements in compliance with IFRS requires Management to make use of judgments, estimates and assumptions that affect both the application of accounting practices and the reported amounts of assets and liabilities, income and expenses. The estimates and significant judgment are based on past experience and on other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments regarding the carrying amounts of assets and liabilities that cannot readily be determined based on other sources. The actual results achieved may differ from these estimates.

Such estimates and assumptions are reviewed on a regular basis. Changes in accounting estimates may affect the results for the period during which they are realized, or for future periods.

The impairment test is performed annually considering the most accurate estimates calculated by Management. The Company’s Management has not identified any relevant indications of impairment in the nine-month period ended September 30, 2026.

The accounting policy which reflects significant estimates and judgments used in the preparation of these interim consolidated financial statements for the nine-month period ended September 30, 2026 has not changed from those valid on December 31, 2025.

5.1 Cash and cash equivalents

(i) The balance refers mostly to Bank Deposit Certificates (“CDBs”) and highly liquid short-term deposits, which are readily convertible into known amounts of cash and are subject to an insignificant risk of changes in value.

Effective January 2026, the Company ceased to consolidate its subsidiary in Cuba and started to account for as an associate using the equity method, in line with the application of the consolidation criteria under applicable accounting standards. As a result, the cash and cash equivalents balances of this investee are no longer included in the consolidated financial statements from that date. This effect is reflected in the line “Sale/(acquisition) and others related to subsidiaries and associates, net of cash” in the Statements of Cash Flows.

The cash and cash equivalents balance includes the amount of R$821,225 at September 30, 2026 (R$4,070,595 in December 31, 2025), in the consolidated financial statements, which is not freely remittable to the Parent Company. As of September 30, 2026, such restriction arises from the unavailability of foreign currency in Bolivia, although the funds remain available for use in the local operations of the respective subsidiary. As of December 31, 2025, the restricted balance also included amounts related to the operation in Cuba, totaling R$2,017,094.

5.2 Investment securities

(i) The balance refers substantially to financial investments linked to tax incentives that are not immediately convertible into a known amount of cash.

The changes in impairment losses on inventory are as follow:

(i) Effect related to the deconsolidation of balance sheet amounts, including the sale of a subsidiary.

(i) Over the past few years, as previously disclosed, the Company has recognized PIS/COFINS credits arising from the exclusion of ICMS, including in the form of tax substitution, from the calculation bases of these contributions. These tax credits were recorded against the recoverable taxes in the balance sheet, in the PIS/COFINS – ICMS exclusion line, as shown in the table above. The amounts that have not yet been offset substantially refer to tax credits from Regime Especial de Tributação de Bebidas Frias (“REFRI”), for the period from 2009 to 2015, in relation to which the lawsuit is currently in the final expert evaluation phase.

8.1 Deferred income tax and social contribution

The amounts of deferred income tax and social contribution for each type of temporary difference are as shown below:

(i) Historically, tax authorities have offset tax losses ex-officio in administrative proceedings in which the Company and some of its subsidiaries are involved, resulting in an accumulated offset of R$314,817. This amount is included in the tax credits recognized under the line of tax losses carried forward. The contingencies in question have a probability of a possible loss.

8.1.1 Realization of deferred taxes

At September 30, 2026 the deferred tax assets and liabilities expected to be utilized/settled, not related to tax losses, are: (i) to be realized until 12 months R$1,566,352; and (ii) to be realized after 12 months R$(638,981).

8.1.2 Net change in deferred taxes

The net change in deferred income tax and social contribution is as follows:

8.1.3 Deferred tax assets related to tax losses

Beyond the tax credits related to tax losses effectively recognized as part of the amounts disclosed above, there are other tax credits related to tax losses that were not recorded in the balance sheets due to their low expectations of realization, based on Management’s assessment. At September 30, 2026, the accumulated balance of these credits represented R$845,153 in taxable value (R$991,549 in December 31, 2025) equivalent to a taxable basis of R$3,194,354 in September 30, 2026 (R$3,788,686 in December 31, 2025).

Additionally, tax credits related to tax losses recorded in the Brazilian ECF (Tax Accounting Bookkeeping), for the purpose of calculating Taxation on a worldwide basis, ceased to be recognized, resulting in a principal amount of R$4,748,729 as of September 30, 2026 (R$5,289,511 as of December 31, 2025).

8.2 Income tax and social contribution

The income taxes reported in the income statement are broken down as follows:

The reconciliation between the weighted nominal tax rate and the effective tax rate is summarized below:

The main events that impacted the effective tax rate for the period were:

9.1 Changes in the carrying amount of property, plant, and equipment

(i) Effect related to the deconsolidation of balance sheet amounts, including the sale of a subsidiary.

9.2 Changes in the carrying amount of right-of-use assets

(i) Effect related to the deconsolidation of balance sheet amounts, including the sale of a subsidiary.

The present value adjustment related to the obligations recorded in trade payables at September 30, 2026 is R$257,150 (R$243,031 at December 31, 2025).

The subsidiaries in Argentina, Chile, and Panama have discount transactions of endorsed trade bills (trade payables securitization) with vendors in the amount of R$87,126 at September 30, 2026 (R$20,247 at December 31, 2025). In general, such discount transactions occur due to legal requirements existing in these jurisdictions. These transactions retain their commercial characteristics, as there are no changes to the previously agreed terms (amount, term or counterparty), and the decision to obtain early payment of the receivables remains at the sole discretion of the vendors. Therefore, these transactions do not result in any additional obligation for the Company.

Additional information regarding the exposure of the Company to interest rates, foreign currency risk and debt repayment schedule is disclosed in Note 20 - Financial instruments and risks.

11.1 Contractual clauses (covenants)

At September 30, 2026, at December 31, 2025, and up to the date of issuance of these consolidated financial statements, no events of default, breaches of covenants, or significant contractual changes occurred that would result in changes to the payment terms of loan and financing agreements.

11.2 Leasing contracts regarding the term and discount rate (Brazil)

The Company estimated the discount rates based on the risk-free forward interest rate curves observable in the Brazilian market, for terms consistent with the lease contracts, plus the Company-specific credit spread. The risk-free curves were obtained from observable market information, while the credit spreads were estimated based on quotations provided by financial institutions:

The Company and its subsidiaries are involved in administrative and judicial proceedings and arbitrations arising from the normal course of business. The assessment of the likelihood of loss, carried out by the Company with the support of its legal advisors, considers the likelihood of the Company position being accepted at the end of the proceedings, considering the applicable legislation, the case law on the subject and the existing evidence. Due to their nature, these proceedings involve inherent uncertainties, including, but not limited to, decisions by courts and tribunals agreements between the parties involved and governmental actions and, as a result, Management cannot, at this stage, estimate the precise timing to conclude such proceedings.

12.1 Provisions

The lawsuits considered probable of loss are fully provisioned, under the terms of IAS 37 - Provisions, Contingent Liabilities and Contingent Assets, and have a tax, civil or labor nature. Cases are considered likelihood of loss when there is established or binding case law unfavorable to the position defended by the Company and its subsidiaries, or, in the case of factual or evidentiary disputes, when the Company and its subsidiaries do not have the necessary and sufficient evidence to prove the claimed right.

12.1.1 Main lawsuits with a probable risk of loss

Taxes on sales: in Brazil, the Company and its subsidiaries are parties to various administrative and judicial proceedings related to ICMS, IPI, PIS and COFINS taxes, considered as probable likelihood of loss. Such proceedings include, among others, tax offsetting, appropriation of tax credits and alleged insufficient payment of the respective taxes.

Labor: the Company and its subsidiaries are parties to labor lawsuits considered likely to result in loss, involving former employees, including those from outsourced service providers. The main issues involve overtime and related effects and respective charges.

Civil: the Company and its subsidiaries are involved in civil proceedings considered as representing a probable likelihood of loss. The most relevant portion of these lawsuits was filed by former distributors, mainly in Brazil, mostly claiming damages resulting from the termination of their contracts with the Company.

Other taxes: refer to provisions for lawsuits concerning taxes unrelated to sales or income taxation. The uncertain tax treatments related to income taxes with a likelihood of probable loss have their value reported directly in the income tax and social contribution payable line, as per IFRIC 23 - Uncertainty on the Treatment of Income Taxes.

12.1.2 Provisions changes

(i) Restructuring provisions mainly relate to organizational improvements, right-sizing and the Group’s digitalization efforts.

12.1.3 Expected settlement of provisions

(i) Restructuring provisions mainly relate to organizational improvements, right-sizing and the Group’s digitalization efforts.

The expected settlement of provisions was based on Management’s best estimate, in line with their internal and external legal advisors’ assessments, at the consolidated balance sheet date.

12.2 Contingencies

The Company and its subsidiaries maintain administrative and judicial disputes with fiscal authorities in Brazil related to certain tax positions adopted when calculating the income tax and social contribution, which, based on Management’s current evaluation, probably are going to be accepted in superior court decisions of last instance, considering the regular compliance with tax laws, case law, and evidence produced, in line with IFRIC 23 - Uncertainty over Income Tax Treatments. The Group is also part on tax proceedings related to other taxes, which involve possible loss risk, according to Management's assessment. To these uncertain tax treatments and possible contingencies there are no constituted provision, due to the likelihood of loss assessment carried out. Such proceedings represent the following estimates.

Contingencies with a remote risk of loss are not disclosed, as the possibility of any settlement is remote, in accordance with IAS 37 - Provisions, Contingent Liabilities and Contingent Assets.

The Company and its subsidiaries have guarantee-insurance bonds and letters of guarantee for some legal proceedings, presented as guarantees on civil, labor and tax lawsuits.

12.2.1 Main contingencies with a possible risk of loss

The changes in the amount of contingencies reported relate mainly to the increase resulting from monetary restatement. In addition, the main process classified with a possible loss probability, which relevant changed between December 31, 2025 and September 30, 2026, are summarized in the table below, along with their respective estimated values involved in the cases.

12.2.2 Tax Proceeding Initiated by the Group

The Company is also a party on other tax proceedings in which it is the claimant and discusses the possibility of recovering or avoiding the payment of taxes that, in the Management's view, lack constitutional and/or legal support for their enforcement. As disclosed on the accounting policies, the Company does not recognize contingent assets in its financial statements. If the inflow of economic benefits becomes probable, based on a forecast assessment conducted by external legal advisors in conjunction with the internal assessment of the Administration, the Company discloses the contingent asset. When the inflow of economic benefits becomes virtually certain, such as when a final judgment is rendered in the case and the gain can be reliably estimated, the asset is no longer contingent, and the Company recognizes it in the financial statements for the period in which the change in estimate occurs.

The contingent assets with relevant changes until September 30, 2026, are summarized in the table below.

13.1 Issued capital

At September 30, 2026, the authorized and issued capital, fully subscribed and paid in, amounting to R$58,308,102 (R$58,275,696 in September 30, 2025) was composed of 15,484,665 common shares (15,761,639 in September 30, 2025), book entry, registered, and with no par value, distributed as follows:

(i) Capital increase related to the issue of shares, under the Company’s share-based payment programs.

(ii) Cancellation of treasury shares, approved by the Board of Directors in August 2026, without reducing the share capital.

13.2 Capital reserves

13.2.1 Share buyback and treasury shares results

Treasury shares represent the Company’s own issued shares that have been repurchased by the Company. The results of treasury shares refer to gains and losses arising from share-based payment transactions and others related items. Changes in treasury shares were as follows:

13.3 Net income reserves