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 June, 2026

(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 (C.N.P.J.) No. 42.150.391/0001-70

State Registration (NIRE) 29300006939

Publicly-held company

MATERIAL FACT

Braskem S.A. ("Braskem" or "Company") (Ticker B3: BRKM3, BRKM5 and BRKM6; NYSE: BAK; LATIBEX: XBRK), further to the Material Facts disclosed on June 25, 2026 and September 26, 2025, hereby informs its shareholders and the market in general that, on this date, the 2nd Bankruptcy and Judicial Reorganization Court of the Judicial District of the Capital of the State of São Paulo (2ª Vara de Falências e Recuperações Judiciais da Comarca da Capital do Estado de São Paulo), within the scope of the Precautionary Injunctive Relief proceeding (Tutela de Urgência Cautelar) ("Injunctive Relief"), filed by the Company and certain of its subsidiaries pursuant to Article 20-B, §1, of Law No. 11,101/2005, has granted the requests, among other measures, order the stay of all enforcement actions and attachments by creditors that have been invited to participate in the mediation proceeding initiated by the Company and certain of its subsidiaries before the Wind Mediation Chamber (Câmara Wind de Mediação) ("Mediation"), with such stay remaining in effect for a period of 60 days.

Braskem reiterates that the Injunctive Relief and the Mediation have a limited scope, strictly financial, and do not encompass any obligations of the Company and its subsidiaries with their suppliers, customers, and other stakeholders, which remain in full force and effect and continue to be performed in the ordinary course, pursuant to the terms of the respective agreements.

The full text of the Injunctive Relief decision will be made available to the Company's shareholders, upon its disclosure, at the Company's headquarters, on its website (https://braskem-ri.com.br), as well as on the IPE Module of CVM's Empresas.NET System (Módulo IPE do Sistema Empresas.NET da CVM) (www.cvm.gov.br).

The Company will keep the market informed of any material developments on this matter, in compliance with applicable laws and regulations.

Additional information may be obtained from the Investor Relations Department by telephone at +55 (11) 3576-9531 or by e-mail at [email protected].

São Paulo, June 26, 2026

Carlos Augusto Machado Pereira de Almeida Brandão

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: June 26, 2026

BRASKEM S.A.


By:	/s/ Carlos Augusto Machado Pereira de Almeida Brandão

	Name:	Carlos Augusto Machado Pereira de Almeida Brandão
	Title:	Chief Financial Officer

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.

BRASKEM SA 6-K