Cosan files 2025 annual report on Form 20-F

Cosan S.A. reports that it has filed its annual report on Form 20-F for the fiscal year ended December 31, 2025 with the U.S. Securities and Exchange Commission.

Accepted by SEC EDGAR 04/10/2026 - 05:33 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Cosan S.A. reports that it has filed its annual report on Form 20-F for the fiscal year ended December 31, 2025 with the U.S. Securities and Exchange Commission. The Form 20-F is available on both the SEC’s website and Cosan’s website, and shareholders can request a free hard copy containing the complete audited financial statements from the Company’s Investor Relations department in São Paulo.

Key Terms

Form 6-K, foreign private issuer, Form 20-F, audited financial statements, +1 more

5 terms

Form 6-K regulatory

"FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16"

A Form 6-K is a report that companies listed in certain countries file to provide important updates, such as financial results, corporate changes, or other significant information, to regulators and investors. It functions like an official company update or news release, helping investors stay informed about developments that could affect their investment decisions.

foreign private issuer regulatory

"FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

Form 20-F regulatory

"it filed its annual report on Form 20-F for the fiscal year ended December 31, 2025"

Form 20-F is the standardized annual disclosure that non-U.S. companies must file with the U.S. securities regulator when their shares are traded in the U.S.; it contains audited financial statements, a plain-language description of the business, management discussion, governance details and key risk factors. It matters to investors because it provides a consistent, comparable company “report card” and rulebook, helping buyers assess financial health, governance and risks before investing.

audited financial statements financial

"the 20-F, which contains the Company’s complete audited financial statements, free of charge"

Audited financial statements are a company's financial reports—like its income, expenses, assets and debts—that have been examined and verified by an independent accountant to confirm they are accurate and complete. For investors, an audit is like having a trusted mechanic inspect a used car: it increases confidence that the financial picture is reliable, reduces the risk of hidden problems, and supports better decisions about valuing or trusting the company.

Investor Relations financial

"Requests should be directed to Investor Relations, Cosan S.A. Av. Brigadeiro Faria Lima"

Investor relations is the communication process between a company and its current or potential investors. It involves sharing information about the company's performance, strategies, and outlook to help investors make informed decisions. Effective investor relations build trust and transparency, similar to a clear conversation between a business and someone considering investing, ensuring both parties understand each other's interests and expectations.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Cosan (CSAN) announce in this Form 6-K?

Cosan announced it filed its annual report on Form 20-F for the fiscal year ended December 31, 2025 with the U.S. Securities and Exchange Commission, making the report available online and by hard copy request.

Which fiscal year does Cosan’s latest Form 20-F cover?

The Form 20-F filed by Cosan covers the fiscal year ended December 31, 2025. This annual report includes the company’s complete audited financial statements for that period, as noted in the disclosure to shareholders.

How can Cosan (CSAN) shareholders access the 2025 Form 20-F?

Shareholders can access Cosan’s 2025 Form 20-F on the SEC’s website and on the company’s own website. The filing notice confirms both online locations as sources for the full annual report.

Can Cosan shareholders request a hard copy of the Form 20-F?

Yes. Cosan states that shareholders may receive a hard copy of the Form 20-F, including the complete audited financial statements, free of charge upon request directed to the company’s Investor Relations department in São Paulo.

Where should requests for Cosan’s Form 20-F hard copy be sent?

Requests should be directed to Investor Relations at Cosan S.A., Av. Brigadeiro Faria Lima, 4,100 – 16th floor, São Paulo, SP 04538-132, Brazil, with contact options including telephone +55 (11) 3897-9797 and the email address ri@cosan.com.

On which exchanges is Cosan (CSAN) listed according to this notice?

Cosan indicates it is listed on B3 under the ticker CSAN3 and on the New York Stock Exchange under the ticker CSAN. These listings are mentioned alongside the company’s identification details in the notice.

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

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16
OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of April 2026

Commission File Number: 001-40155

Cosan S.A.

(Exact name of registrant as specified in its charter)

N/A

(Translation of registrant’s name into English)

Av. Brigadeiro Faria Lima, 4100, – 16th floor
São Paulo, SP 04538-132 Brazil
(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F X Form 40-F

COSAN S.A.

Publicly Held Company

CNPJ n° 50.746.577/0001-15

NIRE 35.300.177.045 | CVM Code 01983-6

NOTICE TO THE MARKET

COSAN S.A. (B3: CSAN3; NYSE: CSAN) (“Cosan” or the “Company”) informs its shareholders and the market in general that, on the date hereof, it filed its annual report on Form 20-F for the fiscal year ended December 31, 2025 with the U.S. Securities and Exchange Commission (SEC).

The Form 20-F is available on the SEC website (www.sec.gov) and on the Company’s website (https://www.cosan.com.br/en/).

Cosan’s shareholders may receive a hard copy of the 20-F, which contains the Company’s complete audited financial statements, free of charge, upon request. Requests should be directed to:

Investor Relations, Cosan S.A.

Av. Brigadeiro Faria Lima, 4,100 – 16th floor

São Paulo, SP 04538-132 Brazil

+55 (11) 3897-9797

ri@cosan.com

São Paulo, April 10, 2026

 Rafael Bergman

Chief Financial and Investor Relations Officer

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:  April 10, 2026

	COSAN S.A.
	By:	/s/ Rafael Bergman
		Name:            Rafael Bergman
		Title: Chief Financial Officer