Cosan to delist NYSE ADSs on Sept. 18, 2026

Cosan S.A. plans to voluntarily delist its ADSs from the NYSE, with trading to continue in the U.S. over-the-counter market under a Level I ADR program.

Rhea-AI Filing Summary

Cosan S.A. (CSAN) has filed Form 25 with the U.S. Securities and Exchange Commission to effect the voluntary delisting of its American Depositary Shares from the New York Stock Exchange. The last trading day of the ADSs on the NYSE will be September 18, 2026.

After the delisting, Cosan will maintain its ADS program as a Level I ADR, allowing the ADSs to continue trading in the over-the-counter market in the United States. The company states it will keep shareholders and the market informed in line with applicable regulations.

Positive

• None.

Negative

• Voluntary NYSE delisting of Cosan’s ADSs may reduce trading visibility and liquidity for U.S. investors, as the ADSs will move from a major exchange to over-the-counter trading after September 18, 2026.

Key Figures

Form filed: Form 25 Last NYSE trading day: September 18, 2026 Announcement date: September 8, 2026 +1 more

4 metrics

Form filed Form 25 Filed with the SEC to initiate voluntary ADS delisting from NYSE

Last NYSE trading day September 18, 2026 Final day Cosan ADSs trade on the New York Stock Exchange

Announcement date September 8, 2026 Date Cosan reported the Form 25 filing and delisting plan

Post-delisting market Over-the-counter (OTC) market ADSs will continue trading in the U.S. as a Level I ADR

Key Terms

Form 25, American Depositary Shares, Level I ADR, over-the-counter ("OTC") market

4 terms

Form 25 regulatory

"it has filed Form 25 with the U.S. Securities and Exchange Commission"

A Form 25 is an official filing with the U.S. Securities and Exchange Commission used to remove a company's stock or other security from a national exchange list. Investors should care because delisting often means less visibility, lower trading volume and wider price swings—similar to a product moving from a major supermarket to a small local market, which can make buying, selling and valuing the security more difficult.

American Depositary Shares financial

"voluntary delisting of its American Depositary Shares ("ADSs")"

American depositary shares (ADSs) are a way for investors in the United States to buy shares of foreign companies without dealing with international markets directly. They represent ownership in a foreign company's stock and are traded on U.S. stock exchanges, making it easier for American investors to buy, sell, and own parts of companies from around the world.

Level I ADR financial

"maintain its ADS program at the Level I ADR"

A Level I ADR is a basic U.S. certificate that represents shares of a foreign company and allows those shares to trade on over‑the‑counter (OTC) markets rather than major U.S. stock exchanges. Think of it as a storefront window in a quieter neighborhood: it gives U.S. investors access to a foreign stock with lower setup costs and fewer reporting requirements, but usually brings lower liquidity, less transparency and potentially higher trading risk.

over-the-counter ("OTC") market financial

"continue trading in the over-the-counter ("OTC") market in the United States"

FAQ

What did Cosan S.A. (CSAN) announce regarding its NYSE listing?

Cosan announced it has filed Form 25 with the SEC for the voluntary delisting of its American Depositary Shares from the New York Stock Exchange. This filing initiates the process to remove the ADSs from NYSE trading.

When is the last trading day for Cosan S.A. (CSAN) ADSs on the NYSE?

The last trading day of Cosan’s ADSs on the NYSE will be September 18, 2026. After that date, the ADSs will no longer trade on the New York Stock Exchange.

Will Cosan S.A. (CSAN) ADSs still trade in the United States after delisting?

Yes. Cosan will maintain its ADS program at the Level I ADR, allowing its ADSs to continue trading in the over-the-counter (OTC) market in the United States after the NYSE delisting is effective.

What SEC form did Cosan S.A. (CSAN) file for the delisting of its ADSs?

Cosan filed Form 25 with the U.S. Securities and Exchange Commission in connection with the voluntary delisting of its American Depositary Shares from the New York Stock Exchange.

How does Cosan S.A. (CSAN) plan to keep investors informed about the delisting?

Cosan states it will keep its shareholders and the market in general duly informed in accordance with the applicable regulations regarding the ADS delisting and related matters.

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

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Available on EDGAR 09/08/2026 - 05:21 PM Accepted by SEC EDGAR 09/08/2026 - 05:20 PM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Issuer

Pursuant To Rule 13a-16 Or 15d-16 of the

Securities Exchange Act of 1934

For the month of September 2026

Commission File Number: 333-251238

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 ☒ 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):

Yes ☐ No ☒

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):

Yes ☐ No ☒

 

COSAN S.A.

CNPJ nº 50.746.577/0001-15

NIRE 35.300.177.045

Publicly Held Company

CVM Code 19836

NOTICE TO THE MARKET

COSAN S.A. (B3: CSAN3; NYSE: CSAN) (“Cosan” or “Company”), further to the Material Facts disclosed on August 14 and August 18, 2026, hereby informs its shareholders that, on this date, it has filed Form 25 with the U.S. Securities and Exchange Commission ("SEC") in connection with the voluntary delisting of its American Depositary Shares ("ADSs") from the New York Stock Exchange ("NYSE") (the "Delisting").

The last trading day of the ADSs on the NYSE will be September 18, 2026.

Following the Delisting, Cosan will maintain its ADS program at the Level I ADR, allowing its ADSs to continue trading in the over-the-counter ("OTC") market in the United States.

Cosan will keep its shareholders and the market in general duly informed in accordance with the applicable regulations.

São Paulo, September 8, 2026.

José Cezario Menezes de Barros Sobrinho

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: September 8, 2026

	COSAN S.A.
	By:	/s/ José Cezario Menezes de Barros Sobrinho
		Name:            José Cezario Menezes de Barros Sobrinho
		Title: Chief Financial Officer