# EDGAR Filing Document

**Accession Number:** 0001430162
**File Stem:** 0001554855-26-000043
**Filing Date:** 2026-2
**Character Count:** 4168
**Document Hash:** 51bfcf744ee96a3b4ad7c903012b74a1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001554855-26-000043.hdr.sgml**: 20260202

**ACCESSION NUMBER**: 0001554855-26-000043

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 5

**CONFORMED PERIOD OF REPORT**: 20260130

**FILED AS OF DATE**: 20260202

**DATE AS OF CHANGE**: 20260130

**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:** 26585386

**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 January 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") hereby informs its shareholders and the market in general that, in compliance with Article 12 of CVM Resolution No. 44/21, it received today a notice from Vertiz Holding S.A. ("Vertiz") and from Fundo de Investimento em Participações BPAC3 – Multiestratégia Responsabilidade Limitada ("FIP BPAC3"), managed by BTG Pactual Serviços Financeiros S/A DTVM, informing the following:

1. In accordance with the provisions of the Company's Shareholders' Agreement executed on November 7, 2025, and available on the Company's and CVM's websites, the BTG Vehicles and the Perfin Vehicle have detached a portion of their shareholding in Vertiz, and now also hold a direct stake in the Company.;

2. Vertiz has reduced its stake in the Company from 1,450,000,000 common shares (equivalent to 36.56% of the Company's total share capital) to 959,661,363 common shares (equivalent to 24.19% of the Company's total share capital).;

3. FIP BPAC3 has reached a position of approximately 331,513,280 common shares of the Company, equivalent to approximately 8.36% of the Company's total share capital.

4. The shareholders' block maintains the same direct and indirect stake in the Company, and the bound and unbound shares will continue to vote in the same manner.

The full notices are attached to this announcement.<br>

São Paulo, January 30, 2026

**Rafael Bergman**<br>Chief Financial and Investor Relations Officer

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.![Graphics](c42cac1f529d17945e1a.jpg)

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.![Graphics](c58cdc5f660de0d26d48.jpg)

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.![Graphics](cc470bc3961538e55006.jpg)

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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: January 30, 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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