# EDGAR Filing Document

**Accession Number:** 0001430162
**File Stem:** 0001554855-26-000594
**Filing Date:** 2026-4
**Character Count:** 3376
**Document Hash:** ab6c991cc4ea03f1826adb0922e946eb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001554855-26-000594.hdr.sgml**: 20260413

**ACCESSION NUMBER**: 0001554855-26-000594

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260410

**FILED AS OF DATE**: 20260413

**DATE AS OF CHANGE**: 20260410

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Cosan S.A.
- **CENTRAL INDEX KEY:** 0001430162
- **STANDARD INDUSTRIAL CLASSIFICATION:** RETAIL-AUTO DEALERS & GASOLINE STATIONS [5500]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** D5
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-40155
- **FILM NUMBER:** 26855874

**BUSINESS ADDRESS:**
- **STREET 1:** AV. BRIGADEIRO FARIA LIMA
- **STREET 2:** 4100, 16TH FLOOR
- **CITY:** SAO PAULO, SP
- **STATE:** D5
- **ZIP:** 04538-132
- **BUSINESS PHONE:** 55-11-3897-9797

**MAIL ADDRESS:**
- **STREET 1:** AV. BRIGADEIRO FARIA LIMA
- **STREET 2:** 4100, 16TH FLOOR
- **CITY:** SAO PAULO, SP
- **STATE:** D5
- **ZIP:** 04538-132

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Cosan S.A. Industria e Comercio
- **DATE OF NAME CHANGE:** 20080319

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

FORM 6-K

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

For the month of April 2026

**Commission File Number: 001-40155**<br>

**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, – 16**th **floor**<br>São Paulo, SP 04538-132 Brazil<br>(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  

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**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

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**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

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| | |
|:---|:---|
| &nbsp;&nbsp; COSAN S.A. | &nbsp;&nbsp; COSAN S.A. |
| &nbsp;&nbsp; By: | /s/ Rafael Bergman |
|  | Name:Rafael Bergman |
|  | Title:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Chief Financial Officer |

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