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    SEC Form 3 filed by new insider Drummond Maria Rita De Carvalho

    3/18/26 7:19:12 PM ET
    $CSAN
    Retail-Auto Dealers and Gas Stations
    Consumer Discretionary
    Get the next $CSAN alert in real time by email
    SEC FORM 3SEC Form 3
    FORM 3UNITED 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
    Estimated average burden
    hours per response:0.5
    1. Name and Address of Reporting Person*
    Drummond Maria Rita de Carvalho

    (Last)(First)(Middle)
    AV. BRIGADEIRO FARIA LIMA, 4100

    (Street)
    SAO PAULOSAO PAULO04538132

    (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)
    Director10% Owner
    XOfficer (give title below)Other (specify below)
    Chief Legal Officer
    6. Individual or Joint/Group Filing (Check Applicable Line)
    XForm 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)1,678,151D
    ADS CSAN(1)672,888D
    LONG TERM INCENTIVE (BVMF: CSAN3)(2)690,076D
    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 ExercisableExpiration DateTitleAmount 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 Drummond03/18/2026
    ** Signature of Reporting PersonDate
    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)
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