# EDGAR Filing Document

**Accession Number:** 0002120444
**File Stem:** 0001292814-26-003151
**Filing Date:** 2026-5
**Character Count:** 7391
**Document Hash:** 51ccc1c3fc8f998942f6ffd4a361eb0e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001292814-26-003151.hdr.sgml**: 20260521

**ACCESSION NUMBER**: 0001292814-26-003151

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260415

**FILED AS OF DATE**: 20260521

**DATE AS OF CHANGE**: 20260521

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Drummond Maria Rita de Carvalho
- **CENTRAL INDEX KEY:** 0002120444

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-40155
- **FILM NUMBER:** 261009933

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** AV. BRIGADEIRO FARIA LIMA, 4100
- **CITY:** SAO PAULO
- **NON US STATE TERRITORY:** SAO PAULO
- **PROVINCE COUNTRY:** D5
- **ZIP:** 04538132
**ISSUER**: 

**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

**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 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Drummond Maria Rita de Carvalho<br><sub>(Last) (First) (Middle)</sub><br>AV. BRIGADEIRO FARIA LIMA, 4100<br><sub>(Street)</sub><br>SAO PAULO, BRAZIL 04538132<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-04-15 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Chief Legal Officer_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Cosan S.A. [ CSAN ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| COMMON STOCK (BVMF: CSAN3) | 2026-04-15 |  | S |  | 35800 | D | 5.570<sup>(1)</sup> | 2202136<sup>(2)</sup> | D |  |
| COMMON STOCK (BVMF: CSAN3) | 2026-04-16 |  | S |  | 36200 | D | 5.4831<sup>(1)</sup> | 2165936<sup>(2)</sup> | D |  |
| COMMON STOCK (BVMF: CSAN3) | 2026-04-17 |  | S |  | 37400 | D | 5.4790<sup>(1)</sup> | 2128536<sup>(2)</sup> | D |  |
| COMMON STOCK (BVMF: CSAN3) | 2026-05-19 |  | J |  | 280954 | A | 5.14<sup>(1)</sup> | 2332228<sup>(2)</sup> | D |  |
| LONG TERM INCENTIVE (BVMF: CSAN3)<sup>(3)</sup> | 2026-05-19 |  | J |  | 280954 | D | 5.14<sup>(1)</sup> | 409122 | D |  |
| ADS CSAN<sup>(4)</sup> |  |  |  |  |  |  |  | 672888 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) Brazilian reais.

(2) The number of shares of Commons Stock includes 559,785 shares of Common Stock that were inadvertently not included in the total number of shares of Common Stock held by the Reporting Person as stated on the Form 3 filed on March 18, 2026.

(3) Right to receive shares resulting from Long-Term Incentive Programs - The Program designates eligible individuals of the Cosan Group who are granted shares, subject to continued service with the Group for a specified period (vesting), and which may also be linked to the achievement of certain performance targets. As of this date, the amount reported represents the number of shares granted to the reporting person. Such amount may increase or decrease as of the actual delivery date, depending on the level of achievement of the applicable targets and the applicable tax effects. All amounts are shown in gross terms.

(4) Each American Depositary Shares represents four shares of Common Stock.

**Signature:** /s/ Maria Rita de Carvalho Drummond  
**Date:** 2026-05-21

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**