Cosan (NYSE: CSAN) CEO Marcelo Martins reports initial share holdings

Rhea-AI Filing Summary

Cosan S.A. director and Chief Executive Officer Marcelo Eduardo Martins filed an initial Form 3 reporting his ownership in the company. He reports direct holdings of 1,960,840 shares of common stock (BVMF: CSAN3), 1,613,666 ADS CSAN1, and 6,347,353 shares tied to a long term incentive (BVMF: CSAN3) as of the reported date.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Martins Marcelo Eduardo

Role Chief Executive Officer

Type	Security	Shares	Price	Value
holding	COMMON STOCK (BVMF: CSAN3)	--	--	--
holding	ADS CSAN1	--	--	--
holding	LONG TERM INCENTIVE (BVMF: CSAN3)2	--	--	--

Holdings After Transaction: COMMON STOCK (BVMF: CSAN3) — 1,960,840 shares (Direct); ADS CSAN1 — 1,613,666 shares (Direct); LONG TERM INCENTIVE (BVMF: CSAN3)2 — 6,347,353 shares (Direct)

Footnotes (1)

Key Figures

Common stock held: 1,960,840 shares ADS held: 1,613,666 ADS Long term incentive units: 6,347,353 units

3 metrics

Common stock held 1,960,840 shares Cosan common stock (BVMF: CSAN3) directly owned as of Form 3 date

ADS held 1,613,666 ADS ADS CSAN1 directly owned as of Form 3 date

Long term incentive units 6,347,353 units LONG TERM INCENTIVE (BVMF: CSAN3) position as disclosed

Key Terms

Form 3, ADS, LONG TERM INCENTIVE, Chief Executive Officer

4 terms

Form 3 regulatory

"INSIDER FILING DATA (Form 3): {"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

ADS financial

""security_title": "ADS CSAN1""

Ads are paid promotional messages a company places across media — online, on TV, in print, or on social platforms — to attract customers, explain products, or shape public perception. For investors, ads matter because they drive sales growth, affect how much a company must spend to win customers, and influence brand strength and long-term value. Ads can also create regulatory or reputational risk if claims are misleading, which can affect profits and stock price.

LONG TERM INCENTIVE financial

""security_title": "LONG TERM INCENTIVE (BVMF: CSAN3)2""

Chief Executive Officer financial

""officer_title": "Chief Executive Officer""

A chief executive officer (CEO) is the top leader of a company, responsible for making major decisions, setting goals, and guiding the organization’s overall direction. Think of the CEO as the captain of a ship, steering it toward success. Investors pay close attention to the CEO because their leadership and strategy can significantly influence the company's performance and future growth.

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

OMB APPROVAL

OMB Number:			3235-0104
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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. 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
X	Officer (give title below)		Other (specify below)
	Chief Executive 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)	1,960,840	D
ADS CSAN1	1,613,666	D
LONG TERM INCENTIVE (BVMF: CSAN3)2	6,347,353	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:

Remarks:

1. Each American Depositary Share 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/ Marcelo Eduardo Martins	03/31/2026
	** 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) CEO Marcelo Martins report on his Form 3?

Marcelo Eduardo Martins reports his initial ownership in Cosan, including common shares, ADSs and long term incentive interests. This establishes his baseline stake as a director and Chief Executive Officer as of the reported Form 3 date.

How many Cosan (CSAN) common shares does Marcelo Martins hold?

Marcelo Martins reports direct ownership of 1,960,840 shares of Cosan common stock (BVMF: CSAN3). This figure reflects his common equity position as disclosed in the Form 3 filing as of the reported date.

How many Cosan (CSAN) ADS does Marcelo Martins report owning?

He reports direct ownership of 1,613,666 ADS CSAN1. These American Depositary Shares provide exposure to Cosan’s equity and are listed separately from the Brazilian common stock position detailed in the same Form 3.

What long term incentive holdings in Cosan (CSAN) does Marcelo Martins disclose?

The Form 3 shows 6,347,353 units under a long term incentive labeled LONG TERM INCENTIVE (BVMF: CSAN3). This reflects equity-based compensation exposure in addition to his directly held common shares and ADS positions.

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

The Form 3 lists holdings rather than specific buy or sell transactions, with transaction entries categorized as holdings and transaction share amounts not detailed. It functions mainly as an initial ownership statement for Marcelo Eduardo Martins.