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 November, 2025

(Commission File No. 1-14862 )

BRASKEM S.A.

(Exact Name as Specified in its Charter)

N/A

(Translation of registrant's name into English)

Rua Eteno, 1561, Polo Petroquimico de Camacari
Camacari, Bahia - CEP 42810-000 Brazil

(Address of principal executive offices)

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 if the registrant is submitting the Form 6-K
in paper as permitted by Regulation S-T Rule 101(b)(1). _____

Indicate by check mark if the registrant is submitting the Form 6-K
in paper as permitted by Regulation S-T Rule 101(b)(7). _____

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___

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- _____.

BRASKEM S.A.

Corporate Taxpayer ID (CNPJ): 42.150.391/0001-70

Company Registry: 29.300.006.939

Publicly Held Company

MATERIAL FACT

Braskem S.A. (“Braskem” or the “Companhia”) (Ticker B3: BRKM3, BRKM5 e BRKM6; NYSE: BAK; LATIBEX: XBRK), in continuation of the Material Facts disclosed on October 11 and November 30, 2023, hereby informs its shareholders and the market in general that Braskem and the State of Alagoas signed, on this date, a term of agreement related to the geological event that occurred in Alagoas (“State Agreement”), providing for the total payment of R$1.2 billion, of which R$139 million (on an updated basis) had already been paid. The balance must be paid in 10 adjusted variable annual installments, mainly after 2030, considering the Company's payment capacity.

The Company had already provisioned R$467 million (as of September 2025) in previous years for compensation for property damage to the State of Alagoas.

The State Agreement establishes compensation, indemnity and/or reimbursement to the State of Alagoas for the full reparation of any and all state pecuniary and non-patrimonial damages, granting the Company full settlement for any damages arising from and/or related to the geological event in Alagoas, including the extinction of the State of Alagoas Action, as per Notice to the Market released on March 7, 2023, subject to judicial approval.

The signing of the State Agreement represents a significant and important step forward for the Company in relation to the impacts resulting from the geological event in Alagoas.

Braskem will keep the market informed about material developments on the matter, in compliance with applicable legislation.

Additional information can be obtained from the Investor Relations Department by phone at +55 11 3576- 9531 or by email braskem-ri@braskem.com.br.

São Paulo, November 10, 2025.

Felipe Montoro Jens

Chief Financial and Investor Relations Officer

Braskem S.A.

SIGNATURES

        Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: November 10, 2025

DISCLAIMER ON FORWARD-LOOKING STATEMENTS

This Material Fact may contain forward-looking statements. These statements are not historical facts, but rather are based on the current view and estimates of the Company's management regarding future economic and other circumstances, industry conditions, financial performance and results, including any potential or projected impact regarding the geological event in Alagoas and related legal procedures on the Company's business, financial condition and operating results. The words “project,” “believe,” “estimate,” “expect,” “plan”, “objective” and other similar expressions, when referring to the Company, are used to identify forward-looking statements. Statements related to the possible outcome of legal and administrative proceedings, implementation of operational and financing strategies and investment plans, guidance on future operations, the objective of expanding its efforts to achieve the sustainable macro objectives disclosed by the Company, as well as factors or trends that affect the financial condition, liquidity or operating results of the Company are examples of forward-looking statements. Such statements reflect the current views of the Company's management and are subject to various risks and uncertainties, many of which are beyond the Company’s control. There is no guarantee that the events, trends or expected results will actually occur. The statements are based on various assumptions and factors, including, but not limited to, general economic and market conditions, industry conditions and operating factors, availability, development and financial access to new technologies. Any change in these assumptions or factors, including the projected impact from the joint venture and its development of technologies, from the geological event in Alagoas and related legal procedures and the unprecedented impact on businesses, employees, service providers, shareholders, investors and other stakeholders of the Company could cause effective results to differ significantly from current expectations. For a comprehensive description of the risks and other factors that could impact any forward-looking statements in this document, especially the factors discussed in the sections, see the reports filed with the Brazilian Securities and Exchange Commission (CVM). This Material Fact does not constitute any offer of securities for sale in Brazil. No securities may be offered or sold in Brazil without being registered or exempted from registration, and any public offer of securities carried out in Brazil must be made through a prospectus, which would be made available by Braskem and contain detailed information on Braskem and its management, as well as its financial statements.