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- _____.

São Paulo, June 23, 2026.

Brazilian Securities and Exchange Commission (CVM)

Attn: Superintendent of Corporate Relations – SEP

Mr. Fernando Soares Vieira

Business Monitoring Manager 1 – GEA-1

Ms. Nilza Maria Silva de Oliveira

Ref.: Official Letter No. 210/2026/CVM/SEP/GEA-1

CVM Case No. 19957.011429/2026-07

Dear Sirs,

We refer to the above-mentioned letter ("Official Letter"), received on June 22, 2026, through which you. request clarification from Braskem S.A. ("Braskem" or "Company"), as follows:

"Subject: Request for clarification on news - CVM Process No. 19957.011429/2026-07

Mr. Director,

1. We refer to the news published on 06.19.2026 on the Globo.com portal, Alagoas section, under the title: "PF investigation points out that Braskem knew of the risk of sinking in Maceió since 1988", which contains the following statements:

"The PF pointed out that Braskem knew about the risks of sinking in Maceió since the 1980s. The reports support the MPF's complaint against former leaders.

Studies from 1986 already warned of subsidence and recommended control. In 1989, new alerts predicted the formation of subsidence basins and craters.

Although the sinking was detectable in the 1990s, the company denied the data. In 2003, it omitted monitoring that indicated changes in relief.

The crisis came to light in 2018 after tremors. In 2024, the PF classified the damage as irreversible, making areas unsuitable for occupation.

The investigations of the Federal Police (PF) into the disaster caused by rock salt mining in Maceió point out that the risks of soil subsidence were already known since the 1980s by Salgema (Braskem's predecessor).

G1 had access to the expert reports that support the complaint of the Federal Public Ministry (MPF) against former managers and technicians linked to the exploitation of the mines. The activity caused the eviction of five neighborhoods in the capital of Alagoas: Pinheiro, Mutange, Bebedouro, Bom Parto and part of Farol.

[...]

According to the research, technical studies commissioned in 1986 already warned of the possibility of subsidence - a gradual lowering of the terrain. The documents recommended control measures to prevent damage to the surface.

That same year, records analyzed by the experts indicated that vibrations caused by collapses in underground cavities had already been identified. Three years later, in 1989, specialized consultants made new warnings about the possibility of the formation of a 'subsidence basin' and craters in the event of collapse.

Subsidence began to be detected in the 1990s

The experts indicate that the process of soil subsidence became detectable from the end of the 1990s. Topographic data and technical surveys analyzed by the PF show progressive changes in the terrain of the region where the mines operated. Despite this, according to the investigation, the company continued to officially maintain that there was no evidence of soil accommodation.

One of the main points of the complaint is the conclusion that Braskem (created in 2002 from the integration of other companies, including Salgema) had formal knowledge of the subsidence process at least since 2003.

That year, according to the PF, the company already had monitoring data that indicated significant changes in relief. Still, it informed the authorities, in official documents, that there was no evidence of subsidence.

For investigators, this was the beginning of a series of omissions and alleged fraud that would have contributed to hiding the seriousness of the problem for more than a decade. The crisis only came to light in 2018, after earthquakes and cracks in buildings scared the population.

2. In view of the foregoing, we determine that you. clarify whether the news is true, and, if so, explain the reasons why you understood it not to be a material fact, as well as comment on other information considered important on the subject.

3. It should be noted that according to article 3 of CVM Resolution No. 44/21, it is incumbent upon the Investor Relations Officer to disclose and communicate to the CVM and, if applicable, to the stock exchange and organized over-the-counter market entity in which the securities issued by the company are admitted to trading, any material act or fact that occurred or related to its business, as well as to ensure their wide and immediate dissemination, simultaneously in all markets in which such securities are admitted to trading."

Braskem clarifies that the news published on June 19, 2026, on the Globo.com portal, refers to the unfolding of the filing of a complaint by the Federal Public Prosecutor's Office of Alagoas ("MPF" and "Complaint"), resulting from the investigation conducted by the Federal Police and related to the geological incident that occurred in Alagoas ("Inquiry").

The existence of the Inquiry and related information, as well as the filing of the Complaint by the MPF, are widely known to the public and have been repeatedly and progressively disclosed by Braskem1. The Annual Financial Statements and the Quarterly Financial Information ("ITR"), specifically in the Explanatory Note "Geological Event – Alagoas", in addition to the Reference Forms (Formulário de Referência) disclosed by the Company since May 2024, contain detailed information about the geological event in Alagoas and its developments, including information on, at first, the Inquiry, and more recently, the Complaint. As an example, in the ITR for the first quarter of 2026, Braskem reported that, in October 2025, the MPF filed a complaint based on the Federal Police's final report of October 2024.

1 As can be seen from the explanatory notes to (i) the financial statements for the fiscal year ended December 31, 2023, (ii) financial information for the first quarter of 2024, (iii) financial information for the second quarter of 2024, (iv) financial information for the third quarter of 2024, (v) financial statements for the financial year ended December 31, 2024, (vi) financial information for the first quarter of 2025, (vii) financial information for the second quarter of 2025, (viii) financial information for the third quarter of 2025, and (ix) financial statements for the fiscal year ended December 31, 2025.

It should be clarified that the content of the Complaint remained under confidentiality, which was only recently withdrawn. Given that the filing of the Complaint had already been informed by the Company in its periodic disclosures, including through its financial information, which continuously and progressively addressed the matter, such fact, in the Company's judgment, did not constitute a material fact, under the applicable regulation. For the same reasons, in the Company's judgment, the acceptance of the Complaint filed by the MPF was also not a material fact.

Being what should be informed, the Company is at the entire disposal of this and. Autarchy to provide any additional information that may be necessary.

Sincerely,

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 Fact of September 26, 2025 and June 25, 2026, hereby informs its shareholders and the market in general that it has provided certain holders and investment managers of one or more of senior securities and debenture holders issued or guaranteed by Braskem (“Investors”) with certain non-public information relating to Braskem and its subsidiaries (“Shared Information”), in the context of a possible reorganization of its capital structure (“Restructuring”).

Under the terms of the confidentiality agreements entered into on June 11, 2026, between Braskem and the Investors (collectively, the “Confidentiality Agreements”), Braskem agreed to publicly disclose all material information provided to the Investors after the termination of the period established in the Confidentiality Agreements. The Shared Information is publicly available on the Braskem website at the link, and is provided to fulfill Braskem’s obligations under the Confidentiality Agreements and in compliance with applicable legal rules.

Since the execution of the Confidentiality Agreements, Braskem and the Investors, through their respective advisors, have prepared and exchanged the following information:

Discussion materials from Braskem and proposed terms for a possible restructuring (“Braskem Proposal”);

Terms proposed by Investors for the structure of the process and framework rules to negotiate a possible Restructuring, dated June 19, 2026 (the “Investors’ Proposal”); and

The Company’s response to the Investor Proposal dated June 24, 2026 (together with Braskem Proposal and the Investors’ Proposal, the “Proposals”).

During this period, representatives and advisors from Braskem and the Investors participated in discussions and correspondence regarding the Proposals, including an in-person meeting held on June 11, 2026 among representatives and advisors from Braskem and the Investors, with no agreement reached between the parties regarding Braskem Proposal.

Given the short-term needs of the Company and the Company’s interest in negotiating a Restructuring under a stable environment, during that in-person meeting the Company requested the Investors to prioritize discussions on the process and framework rules to negotiate the terms of the Restructuring under the stable and protected environment provided by an extrajudicial reorganization proceeding in Brazil and, accordingly, requested to the Investors to provide a response with respect to the Company’s proposed process and framework rules on an expedited basis, by the beginning of the week following the June 11 meeting. The Investor Proposal with such response was received by the Company six business days after the meeting and in terms unacceptable to the Company. Therefore, Braskem indicated that it would not agree to the Investor Proposal.

The Company reassured the Investors that it is fully committed to continue discussions with its financial creditors in finding a consensual, structured, and orderly solution for its capital structure that ensures the continuance of its operations in the ordinary course of business.

The information contained in the Braskem Proposal is accurate as of the delivery date, has not been updated since the delivery date, and should not be used for any other purpose.

A copy of the terms of the Proposals are available on the Braskem website at the link. No agreement regarding any of the Proposals or any other transaction has been reached to date.

The Braskem Proposal contain projections regarding prices, supply, sales volume, consumption and feedstock supply, costs, production and utilization rate, as well as Braskem's financial indicators, up to 2035. The projections presented are hypothetical data and forecasts that reflect the current expectations of Braskem's management and should not be interpreted as guarantees or promises of performance, being subject to risks and uncertainties associated with the economic, regulatory, and competitive conditions of the markets in which Braskem operates, and may therefore differ materially from the figures and results actually recorded by Braskem. The Company clarifies that the projections contained in the materials and the Braskem Proposal should not be considered as guidance and were prepared in the context of negotiations with Investors.

The Company clarifies that the projections contained in Braskem's Shared Information should not be considered as guidance and were prepared in the context of the Restructuring.

Braskem will keep the market informed of any material developments on this matter, in compliance with applicable laws.

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 25, 2026

Carlos Augusto Machado Pereira de Almeida Brandão

~~Investor~~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 2325, 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

~~DISCLAIMER ON~~ FORWARD-LOOKING STATEMENTS

This ~~report~~ onMaterial ~~Form~~Fact ~~6-K~~ may contain forward-looking statements ~~within the meaning of the Private Securities Litigation Reform Act of 1995~~. These statements are ~~statements that are~~ not historical facts, ~~and~~but rather are based on ~~our~~the ~~management’s~~ current view and estimates of the Company's management regarding future economic and other circumstances, industry conditions, ~~company~~financial performance and ~~financial~~ results, including any potential or projected impact ofregarding the geological event in Alagoas and related legal ~~proceedings~~procedures ~~and of COVID-19~~ on ~~our~~the Company's business, financial condition and operating results. The words ~~“anticipates~~"project,”" ~~“believes~~"believe,”" ~~“estimates~~"estimate,”" ~~“expects~~"expect,~~” “plans”~~" "plan", "objective" and other similar expressions, aswhen ~~they~~referring ~~relate~~ to the ~~company~~Company, are ~~intended~~used to identify forward-looking statements. Statements ~~regarding~~related to the possible ~~potential~~ outcome of legal and administrative proceedings, ~~the~~ implementation of ~~principal~~operational ~~operating~~ and financing strategies and ~~capital~~investment ~~expenditure~~ plans, guidance on future operations, the ~~direction~~objective of ~~future~~expanding ~~operations~~its ~~and~~efforts to achieve the sustainable macro objectives disclosed by the Company, as well as factors or trends ~~affecting~~that ~~our~~ affect the financial condition, liquidity or operating results of ~~operations~~the Company are examples of forward-looking statements. Such statements reflect the current views of ~~our~~the Company's management and are subject to avarious ~~number of~~ risks and uncertainties, many of which are ~~outside~~beyond of the ~~our~~Company's control. There is no guarantee that the ~~expected~~ events, trends or expected results will actually occur. The statements are based on ~~many~~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 ~~changes~~change in ~~such assumptions~~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 ~~proceedings~~procedures and the unprecedented impact ~~of COVID-19 pandemic~~ on ~~our business~~businesses, employees, service providers, ~~stockholders~~shareholders, investors and other ~~stakeholders,~~ stakeholders of the Company could cause ~~actual~~effective results to differ ~~materially~~significantly from current expectations. ~~Please~~For ~~refer~~a tocomprehensive ~~our~~description of ~~annual~~the ~~report~~risks onand ~~Form~~other 20factors that could impact any forward-Flooking ~~for~~statements in this document, especially the ~~year~~ ~~ended~~factors ~~December~~discussed 31in the sections, ~~2019~~see the reports filed with the ~~SEC,~~Brazilian asSecurities ~~well~~and asExchange Commission (CVM). This Material Fact does not constitute any ~~subsequent~~offer ~~filings~~of ~~made~~securities byfor ussale ~~pursuant~~in toBrazil. ~~the~~No ~~Exchange~~securities ~~Act,~~may ~~each~~be offered or sold in Brazil without being registered or exempted from registration, and any public offer of ~~which~~securities iscarried ~~available~~out onin ~~the~~Brazil ~~SEC’s~~must ~~website~~be ~~(www.sec.gov),~~made ~~for~~through a ~~full~~prospectus, ~~discussion~~which ofwould ~~the~~be ~~risks~~made available by Braskem and contain ~~other~~detailed ~~factors~~information ~~that~~on ~~may~~Braskem ~~impact any~~and ~~forward-looking~~its ~~statements~~management, inas ~~this~~well ~~presentation~~as its financial statements.

Filing Compare · BRASKEM SA