• Marcelo Eduardo Martins, chief executive officer, reported purchases of 4,040,614 Cosan common shares at prices of BRL 7.05 and BRL 5.14.
• Directly held common shares rose to 4,890,286 following the transactions.
• Long Term Incentive holdings fell to 2,353,314 shares.
• He also reported beneficial ownership of 1,613,666 Cosan ADSs.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Cosan SA published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001292814-26-003161), on May 21, 2026, and is solely responsible for the information contained therein.