Cosan (NYSE: CSAN) legal chief reports initial equity stake and incentives

Rhea-AI Filing Summary

Cosan S.A. Chief Legal Officer Maria Rita de Carvalho Drummond filed an initial ownership report showing existing equity interests in the company. She reports direct holdings of 1,678,151 shares of common stock and 672,888 ADSs, with each ADS representing four common shares.

She also reports 690,076 shares tied to long-term incentive programs, which are subject to continued service, vesting periods, performance targets, and tax effects, so the final number of shares delivered may increase or decrease over time.

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^*

Drummond Maria Rita de Carvalho

(Last) (First) (Middle)

AV. BRIGADEIRO FARIA LIMA, 4100

(Street)

SAO PAULO SAO PAULO 04538132

(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)

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

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 (BVMF: CSAN3)	1,678,151	D
ADS CSAN(1)	672,888	D
LONG TERM INCENTIVE (BVMF: CSAN3)(2)	690,076	D

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

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.

	/s/ Maria Rita de Carvalho Drummond	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 the initial equity holdings of Cosan’s Chief Legal Officer. It lists common shares, ADSs, and long-term incentive grants, giving investors a clear snapshot of her existing ownership position in the company.

How many Cosan common shares does the Chief Legal Officer hold?

The Chief Legal Officer reports holding 1,678,151 common shares of Cosan S.A. This figure reflects her direct ownership in the company’s common stock as of the Form 3 reporting date.

How many Cosan ADSs are reported in the Form 3 for CSAN?

The filing shows 672,888 American Depositary Shares (ADS). A footnote explains that each ADS represents four shares of common stock, giving exposure to the underlying Cosan equity through the ADS structure.

What is the long-term incentive position reported by Cosan’s legal chief?

The Form 3 lists 690,076 shares tied to long-term incentive programs. These awards depend on continued service, vesting conditions, performance targets, and tax effects, so the actual number of shares ultimately delivered may change.

Does this Cosan (CSAN) Form 3 show any recent insider buying or selling?

No buy or sell transactions are reported. The Form 3 is an initial ownership statement, summarizing existing holdings in common stock, ADSs, and long-term incentive awards rather than new market trades.