0001430162 2025-01-01 2025-12-31 0001430162 dei:BusinessContactMember 2025-01-01 2025-12-31 0001430162 csan:AmericanDepositoryReceiptMember 2025-01-01 2025-12-31 0001430162 csan:CommonSharesMember 2025-01-01 2025-12-31 0001430162 2025-12-31 shares D5 true 2025 FY 0001430162 --12-31 20-F/A false true 2025-12-31 false false 001-40155 COSAN S.A. Av. Brigadeiro Faria Lima, 4,100 – 16th floor São Paulo 04538-132 BR José Cezário Menezes de Barros Sobrinho +55 11 3897-9797 Av. Brigadeiro Faria Lima, 4,100 – 16th floor São Paulo 04538-132 BR American depositary shares, each representing four common shares, no par value Common shares, no par value 3966570932 Yes No Yes Yes Large Accelerated Filer false true PricewaterhouseCoopers Auditores Independentes Ltda. São Paulo, Brazil 1351 false International Financial Reporting Standards false We are amending our Annual Report on Form 20-F for the fiscal year ended December 31, 2025 as originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on April 10, 2026 (the “Original Annual Report”) for the purpose of filing with the SEC the financial statements for the fiscal years ended March 31, 2026, 2025 and 2024 of Raízen S.A. as Exhibit 15.2.