Cosan CEO acquires 46,298 shares, disposes of rights

The CEO's reported post-transaction positions include 5,124,299 common shares, 2,028,232 Long-Term Incentive share rights and 1,613,666 ADSs.

Rhea-AI Filing Summary

Cosan S.A. CEO Marcelo Eduardo Martins reported acquiring 46,298 common shares and disposing of 46,298 Long-Term Incentive share rights on October 23, 2026. Both transaction entries report R$5.40 per share. His reported post-transaction positions were 5,124,299 common shares and 2,028,232 Long-Term Incentive share rights.

The Long-Term Incentive amount represents shares granted under the group’s incentive programs. The program terms include continued service for a specified vesting period and may link awards to performance targets; the amount may change by actual delivery based on target achievement and tax effects. Martins also reported holding 1,613,666 ADSs; each ADS represents four common shares.

Insider Trade Summary

Other: 92,596 shares

Other 3 txns

Insider Martins Marcelo Eduardo

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Other	COMMON STOCK (BVMF: CSAN3) F1	46,298	$5.40	$250K
Other	LONG TERM INCENTIVE (BVMF: CSAN3) F2, F1	46,298	$5.40	$250K
holding	ADS CSAN F3	--	--	--

Holdings After Transaction: COMMON STOCK (BVMF: CSAN3) — 5,124,299 shares (Direct); LONG TERM INCENTIVE (BVMF: CSAN3) — 2,028,232 shares (Direct); ADS CSAN — 1,613,666 shares (Direct)

Footnotes (3)

1. F1. Brazilian reais.
2. F2. 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.
3. F3. Each American Depositary Shares represents four shares of Common Stock.

Key Figures

Common shares acquired: 46,298 shares Long-Term Incentive share rights disposed: 46,298 share rights Reported price per share: R$5.40 per share +4 more

7 metrics

Common shares acquired 46,298 shares October 23, 2026

Long-Term Incentive share rights disposed 46,298 share rights October 23, 2026

Reported price per share R$5.40 per share Listed for both transaction entries

Common shares after transaction 5,124,299 shares Reported post-transaction position

Long-Term Incentive share rights after transaction 2,028,232 share rights Reported post-transaction position

ADSs held 1,613,666 ADSs Reported holding

Common shares per ADS 4 common shares Each ADS represents this number of common shares

Key Terms

Long-Term Incentive Programs, vesting, American Depositary Shares

3 terms

Long-Term Incentive Programs financial

"Right to receive shares resulting from Long-Term Incentive Programs"

vesting financial

"subject to continued service with the Group for a specified period (vesting)"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

American Depositary Shares financial

"Each American Depositary Shares represents four shares of Common Stock"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What transactions did CSANY CEO Marcelo Eduardo Martins report?

Marcelo Eduardo Martins reported acquiring 46,298 common shares and disposing of 46,298 Long-Term Incentive share rights on October 23, 2026. Both transaction entries report R$5.40 per share. His reported post-transaction positions were 5,124,299 common shares and 2,028,232 Long-Term Incentive share rights.

What terms apply to CSANY's Long-Term Incentive awards?

The program awards shares subject to continued service for a specified vesting period and may also link awards to performance targets. The reported amount may increase or decrease by actual delivery depending on target achievement and applicable tax effects.

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

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Available on EDGAR 10/27/2026 - 05:15 PM EDT Accepted by SEC EDGAR 10/27/2026 - 05:15 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Martins Marcelo Eduardo

(Last) (First) (Middle)

AV. BRIGADEIRO FARIA LIMA

4,100 16TH FLOOR

(Street)

SAO PAULO 04538- 132

(City) (State) (Zip)

BRAZIL

(Country)

2. Issuer Name and Ticker or Trading Symbol
Cosan S.A. [ CSANY ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol
[CSAN3]

3. Date of Earliest Transaction (Month/Day/Year)
10/23/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
COMMON STOCK (BVMF: CSAN3)	10/23/2026		J		46,298	A	$5.4(1)	5,124,299	D
LONG TERM INCENTIVE (BVMF: CSAN3)(2)	10/23/2026		J		46,298	D	$5.4(1)	2,028,232	D
ADS CSAN(3)								1,613,666	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Brazilian reais.

2. 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.

3. Each American Depositary Shares represents four shares of Common Stock.

	/s/ Marcelo Eduardo Martins	10/27/2026
	** Signature of Reporting Person	Date
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.
* Form 4: SEC 1474 (03-26)