Braskem holds 27 preferred treasury shares in September

Braskem S.A. reported 27 Class “A” preferred shares in treasury at both the opening and closing of September 2026.

Rhea-AI Filing Summary

Braskem S.A. reported 27 Class “A” preferred shares in treasury at both the opening and closing of September 2026. The section for trading during the month lists no intermediate operation.

Key Figures

Opening treasury balance: 27 shares Closing treasury balance: 27 shares

2 metrics

Opening treasury balance 27 shares Class “A” preferred shares; September 2026

Closing treasury balance 27 shares Class “A” preferred shares; September 2026

Key Terms

Shares Held in Treasury, Preferred Share

2 terms

Shares Held in Treasury financial

"SHARES HELD IN TREASURY"

Shares held in treasury are stock a company issued and later repurchased, keeping those shares in its own ‘storage’ where they typically don’t vote or receive dividends. For investors this matters because treasury shares reduce the number of shares held by the public—potentially lifting per‑share earnings and changing ownership percentages—and the company can later reissue or retire them, which affects supply and possible dilution.

Preferred Share financial

"Share Class “A” Preferred Share"

A preferred share is a type of company stock that behaves like a mix of ownership and a fixed-income investment: it typically pays regular dividends at a set rate and has priority over common shares for those payments and for claims on assets if the company is liquidated. Investors care because preferred shares offer steadier income and higher claim priority than common stock, but usually with limited upside potential and little or no voting control.

FAQ

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How many BAK shares did Braskem report in treasury for September 2026?

Braskem reported 27 Class “A” preferred shares in treasury at both the opening and closing of September 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 6-K: How Foreign Companies Report to the SEC →

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Available on EDGAR 10/13/2026 - 06:01 AM EDT Accepted by SEC EDGAR 10/09/2026 - 07:56 PM EDT Learn about SEC filing dates

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 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- _____.

INDIVIDUAL FORM SHARES HELD IN TREASURY (Article 11 of CVM Resolution #44/2021) In ( ) ( x ) Sep/26 the only operations with securities and derivatives were those presented below, in compliance with Article 11 - CVM Instruction # 44/2021 no operation with securities and derivatives, in compliance with Article 11 - CVM Instruction # 44/2021, were held. Below are the securities and derivatives held by Braskem S.A. Company’s Name: Braskem S.A. Corporate Taxpayers ID 42.150.391/0001-70 Name: Braskem S.A. Qualification: Shares in Treasury Opening Balance Securities/ Derivatives Securities Characteristics Quantity Share Class “A” Preferred Share 27 Trading in the month Securities/ Derivatives Securities Characteristics Intermediate Operation Day Quantity Price Volume (R$) Closing Balance Securities/ Derivatives Securities Characteristics Quantity Share Class “A” Preferred Share 27

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 9, 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 on Form 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 are based on our management’s current view and estimates of future economic and other circumstances, industry conditions, company performance and financial results, including any potential or projected impact of the geological event in Alagoas and related legal proceedings and of COVID-19 on our business, financial condition and operating results. The words “anticipates,” “believes,” “estimates,” “expects,” “plans” and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the potential outcome of legal and administrative proceedings, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting our financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of our management and are subject to a number of risks and uncertainties, many of which are outside of the our control. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors, including the projected impact of the geological event in Alagoas and related legal proceedings and the unprecedented impact of COVID-19 pandemic on our business, employees, service providers, stockholders, investors and other stakeholders, could cause actual results to differ materially from current expectations. Please refer to our annual report on Form 20-F for the year ended December 31, 2019 filed with the SEC, as well as any subsequent filings made by us pursuant to the Exchange Act, each of which is available on the SEC’s website (www.sec.gov), for a full discussion of the risks and other factors that may impact any forward-looking statements in this presentation.