# EDGAR Filing Document

**Accession Number:** 0001430162
**File Stem:** 0001554855-26-001350
**Filing Date:** 2026-6
**Character Count:** 3920
**Document Hash:** 8fe5059137545af16a4d0c763e6fa075
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001554855-26-001350.hdr.sgml**: 20260617

**ACCESSION NUMBER**: 0001554855-26-001350

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260317

**FILED AS OF DATE**: 20260617

**DATE AS OF CHANGE**: 20260617

**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:** 261096746

**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 June 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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![Image1](c7777f0dd098db072508.jpg)

**COSAN S.A.**

CNPJ nº 50.746.577/0001-15

NIRE 35.300.177.045

Publicly held company

CVM Code 19836

**<u>MATERIAL FACT</u>**

**COSAN S.A. (B3: CSAN3; NYSE: CSAN)** ("<u>Cosan</u>" or "<u>Company</u>"), in compliance with the provisions of CVM Resolution No. 44, hereby informs its shareholders and the market in general that Radar Group, on the date of yesterday, through certain of its subsidiaries ("Radar"), which hold agricultural properties with investments by Cosan, has entered into a purchase and sale commitment agreement ("Purchase and Sale Agreement") for the disposal of part of the properties in its portfolio ("Properties").

The Properties correspond to 12% of Radar's total agricultural land portfolio, are in the state of Mato Grosso, comprise a total area of 41,214 hectares, and are used for the cultivation of soybeans, corn, and cotton. The total price offered by the third-party buyer for these Properties is BRL 1.85 billion, of which approximately BRL 586 million corresponds to Cosan's interest.

The completion of the transaction is subject to certain customary conditions precedent for this type of transaction.

This transaction is aligned with Cosan's strategy of divestments, deleveraging, and portfolio simplification.

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

São Paulo, June 17, 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: June 17, 2026

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

---