Cosan insider restructures 103,765-share equity position

Rhea-AI Filing Summary

Cosan S.A. Chief Legal Officer Maria Rita de Carvalho Drummond reported an internal restructuring of equity holdings coded as "other acquisition or disposition." On 2026-08-10, she shifted 103,765 units at BRL 3.99 between directly held common stock and a Long-Term Incentive Program, with no net change in total shares. Following these movements, she directly holds 2,407,459 common shares, 304,490 Long-Term Incentive Program shares, and 672,888 ADSs, each ADS representing four common shares.

Insider Trade Summary

Other: 207,530 shares

Other 3 txns

Insider Drummond Maria Rita de Carvalho

Role Chief Legal Officer

Type	Security	Shares	Price	Value
Other	COMMON STOCK (BVMF: CSAN3) F1, F2	103,765	$3.99	$414K
Other	LONG TERM INCENTIVE (BVMF: CSAN3) F2, F1	103,765	$3.99	$414K
holding	ADS CSAN F3	--	--	--

Holdings After Transaction: COMMON STOCK (BVMF: CSAN3) — 2,407,459 shares (Direct); LONG TERM INCENTIVE (BVMF: CSAN3) — 304,490 shares (Direct); ADS CSAN — 672,888 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

Restructured units: 103,765 shares Recorded price: BRL 3.99 per share Common shares held: 2,407,459 shares +2 more

5 metrics

Restructured units 103,765 shares Internal transfer on 2026-08-10 between common stock and Long-Term Incentive holdings

Recorded price BRL 3.99 per share Price applied to the 103,765-unit restructuring transaction, denominated in Brazilian reais

Common shares held 2,407,459 shares Direct Cosan common stock holdings after the reported transactions

Long-Term Incentive shares 304,490 shares Long-Term Incentive Program shares attributed to the reporting person as of the date

ADS holdings 672,888 ADSs Directly held ADS CSAN; each ADS represents four common shares

Key Terms

Long-Term Incentive Programs, vesting, performance targets, American Depositary Shares, +1 more

5 terms

Long-Term Incentive Programs financial

"Right to receive shares resulting from Long-Term Incentive Programs - The Program designates eligible"

vesting financial

"shares, subject to continued service with the Group for a specified period (vesting), and which may also"

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.

performance targets financial

"and which may also be linked to the achievement of certain performance targets. As of this date, the"

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.

Brazilian reais financial

"Brazilian reais."

FAQ

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

What did Cosan (CSAN) disclose about Maria Rita de Carvalho Drummond’s recent share movements?

Cosan reported that Chief Legal Officer Maria Rita de Carvalho Drummond restructured 103,765 equity units on 2026-08-10, shifting them between common stock and a Long-Term Incentive Program, with no net change in her overall share count.

How many Cosan (CSAN) common shares does the insider hold after this Form 4?

After the reported transactions, Maria Rita de Carvalho Drummond directly holds 2,407,459 Cosan common shares. This reflects her position following the internal transfer between common stock and Long-Term Incentive Program awards.

What is the size of Maria Rita de Carvalho Drummond’s Long-Term Incentive holdings in Cosan (CSAN)?

Her Long-Term Incentive Program position totals 304,490 shares as of the transaction date. These awards are subject to vesting and may vary based on performance targets and applicable tax effects.

At what price were the Cosan (CSAN) internal transfers recorded on the Form 4?

The internal transfers involving 103,765 units were recorded at BRL 3.99 per unit. A footnote specifies that this amount is denominated in Brazilian reais, the currency of the underlying transactions.

How many Cosan (CSAN) ADSs does the reporting person hold after the transaction?

The filing shows a direct holding of 672,888 Cosan ADSs. A footnote explains that each ADS represents four shares of Cosan common stock, providing additional context on her indirect economic exposure.

Does the Cosan (CSAN) Form 4 indicate any net buying or selling by the insider?

The reported entries are coded as "other acquisition or disposition" with matched acquire and dispose amounts of 103,765 units, and the summary indicates a neutral net buy/sell share count from these restructuring transactions.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 08/12/2026 - 05:51 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^*

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

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

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

2a. Foreign Trading Symbol
[CSAN3]

3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026

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)	08/10/2026		J		103,765	A	$3.99(1)	2,407,459(2)	D
LONG TERM INCENTIVE (BVMF: CSAN3)(2)	08/10/2026		J		103,765	D	$3.99(1)	304,490	D
ADS CSAN(3)								672,888	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/ Maria Rita de Carvalho Drummond	08/12/2026
	** 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)