Cosan (CSAN) director reports 4.25M indirectly held shares in initial Form 3

Rhea-AI Filing Summary

Cosan S.A. director Rosenberg Whitaker Carneiro Ralph Gustavo filed an initial Form 3, reporting indirect ownership of 4,251,582 shares of Cosan common stock through the investment fund Classe A do Perfin Rally Fundo de Investimento em Participacoes Multiestrategia Responsabilidade Limitada. He disclaims beneficial ownership beyond any pecuniary interest in the fund.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Rosenberg Whitaker Carneiro Ralph Gustavo

Role Director

Type	Security	Shares	Price	Value
holding	COMMON STOCK (CSAN3)	--	--	--

Holdings After Transaction: COMMON STOCK (CSAN3) — 4,251,582 shares (Indirect, CLASSE A DO PERFIN RALLY FUNDO DE INVESTIMENTO EM PARTICIPACOES MULTIESTRATEGIA RESP LIMITADA)

Footnotes (1)

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Understanding Insider Trading Forms →

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

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1. Name and Address of Reporting Person^*

Rosenberg Whitaker Carneiro Ralph Gustavo

(Last) (First) (Middle)

RUA LEOPOLDO COUTO MAGALHAES JUNIOR

822, 1ST FLOOR

(Street)

SAO PAULO SP 04542-000

(City) (State) (Zip)

BRAZIL

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
Cosan S.A. [ CSAN ]

3a. Foreign Trading Symbol
[CSAN3]

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

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

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

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
COMMON STOCK (CSAN3)(1)	4,251,582	I	CLASSE A DO PERFIN RALLY FUNDO DE INVESTIMENTO EM PARTICIPACOES MULTIESTRATEGIA RESP LIMITADA

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Mr. Carneiro owns common stock of Cosan S.A. through the investment fund, Classe A do Perfin Rally Fundo de Investimento em Participacoes Multiestrategia Responsabilidade Limitada. Mr. Carneiro disclaims beneficial ownership of the shares held by the investment fund except to the extent, if any, of his pecuniary interest therein.

	/s/ Ralph Gustavo Rosenberg Whitaker Carneiro	03/18/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What does Cosan (CSAN) disclose in this Form 3 filing?

The Form 3 shows director Rosenberg Whitaker Carneiro Ralph Gustavo’s initial report of indirect ownership in Cosan S.A.. He is associated with 4,251,582 common shares held through an investment fund rather than directly in his own name.

How many Cosan (CSAN) shares are reported as indirectly owned?

The filing reports 4,251,582 Cosan S.A. common shares as indirectly owned. These shares are held by Classe A do Perfin Rally Fundo de Investimento em Participacoes Multiestrategia Responsabilidade Limitada, not directly by the director personally.

How are the Cosan (CSAN) shares held by the reporting person?

The shares are held indirectly through an investment fund named Classe A do Perfin Rally Fundo de Investimento em Participacoes Multiestrategia Responsabilidade Limitada. This means the director’s interest is through the fund structure, not through direct share certificates in his own account.

Does the Cosan (CSAN) director claim full beneficial ownership of these shares?

No. The director explicitly disclaims beneficial ownership of the fund’s Cosan S.A. shares, except to the extent of any pecuniary interest. This limits his claimed economic and ownership rights to his actual financial stake in the fund.

Is this Cosan (CSAN) Form 3 a buy or sell transaction?

The Form 3 does not report a buy or sell transaction in Cosan S.A. shares. It is an initial statement of beneficial ownership, listing an existing indirect holding through an investment fund rather than documenting new trading activity.