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, 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- _____.

NOTICE TO THE MARKET
São Paulo, October
1, 2025 – BRASKEM S.A. (“Braskem” or “Company”) (Ticker B3: BRKM3, BRKM5 and BRKM6; NYSE: BAK; LATIBEX:
XBRK), in continuity with the material facts disclosed on May 23, July 7, and August 22, 2025, and the notice to the market of July 17,
2025, hereby informs its shareholders and the market in general that it has received correspondence from Novonor S.A. – Under Judicial
Reorganization regarding the update of Concentration Act No. 08700.006808/2025-81 before the Administrative Council for Economic Defense
(Superintendência-Geral do Conselho Administrativo de Defesa Econômica – CADE), as follows:
“
Ref.: Concentration Act No. 08700.006808/2025-81
In
continuity with previous communications on the subject, we inform you that the Tribunal of the Administrative Council for Economic Defense
(“CADE”) has approved today, unanimously and without restrictions, Concentration Act No. 08700.006808/2025-81, jointly submitted
by NSP Investimentos S.A. (“NSP Inv”) and Petroquímica Verde Fundo de Investimento em Participações –
Multistrategy (“Fund”).
We clarify that
the terms and conditions of the concentration act submitted for CADE’s review are not definitive or binding regarding the potential
transaction. Therefore, depending on the progress of negotiations between NSP Inv and the Fund, which are still ongoing, new terms and
conditions regarding the potential transaction may be agreed upon by the parties.”
Braskem informs that it
will keep the market updated on any material developments on the matter, in compliance with applicable laws.
Additional information
can be obtained from the Investor Relations Department by phone at +55 (11) 3576-9531 or by e-mail braskem-ri@braskem.com.br.
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: October 1, 2025
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BRASKEM S.A. |
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By: |
/s/ Felipe Montoro Jens |
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Name: |
Felipe Montoro Jens |
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Title: |
Chief Financial Officer |
FORWARD-LOOKING STATEMENTS
This Notice to the Market 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 Notice to the Market 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.