Form 6-K Filing

This report is filed by Cosan S.A. for the month of May 2026. The company is a foreign issuer and is submitting its report under Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934. Cosan S.A. is required to file annual reports under Form 20-F. The filing is not being submitted in paper format. The report is signed by Rafael Bergman, Chief Financial Officer, on May 15, 2026.