Cosan S.a.BMFBOVESPA: CSAN3

01/20/2026 - Notice to Debentures Holders - Payment of interest

· Issued by Cosan S.a.
COSAN S.A.

Corporate Taxpayer ID (CNPJ/MF): 50.746.577/0001-15 Company Registry (NIRE): 35.300.177.045

Publicly Held Company

NOTICE TO HOLDERS OF THE 8THISSUE OF SIMPLE, UNSECURED, NON-CONVERTIBLE DEBENTURES OF COSAN S.A.

COSAN S.A. (B3: CSAN3; NYSE: CSAN) ("Cosan" or "Company"), hereby announces to the holders of the single series of the 8thIssue of Simple, Unsecured, Non-Convertible, of the Unsecured Debentures of Cosan S.A., issued on November 21, 2023 (Code: CSAN18), that the payment of interest on the Debentures will take place on January 21, 2026, through Itaú Corretora de Valores S.A. ("Itaucor"), the transfer agent, as shown below.

Single Series

Unit price

R$ 83.53813100

Number of Debentures

1,250,000

The gross total amount to be paid is R$104,422,663.75 (one hundred and four million, four hundred and twenty-two thousand, six hundred and sixty-three reais and seventy-five cents).

The Company's Management, through the Investor Relations department, is available to

debenture holders, shareholders, and the market for further information.

São Paulo, January 20, 2026.

Rafael Bergman

Chief Financial and Investor Relations Officer

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