Cosan CSANY Insider Ownership

Updated Oct 10, 2026

In the last 12 months, insiders at Cosan made open-market purchases of $23.82 million (4.04Mn shares) and open-market sales of $869,890 (187.04K shares).

• Counted by insider, open-market buying of CSANY stock in the past 12 months came from one insider and selling from 2 insiders.
• Among CSANY's insiders, Marcelo Eduardo Martins (Chief Executive Officer) was the top open-market buyer in the past 12 months, with $23.82 million of stock purchased (4.04Mn shares) and the latest purchase on May 19, 2026.
• Meanwhile, the largest open-market sales of CSANY in the past 12 months were by Maria Rita De Carvalho Drummond (Chief Legal Officer), totaling $602,809 (109.4K shares), most recently on April 17, 2026.
• Rubens Ometto Silveira Mello (Director) made the most recent open-market trade by an insider of Cosan, a sale of 77.64K shares for $267,082 on May 22, 2026.
• Business Quant data puts insider holdings in CSANY at 7.88Mn shares across insiders' latest Form 4 filings, or 1.26% of the 624.51Mn shares outstanding; that total is up 9.10% from 7.22Mn shares at the end of Q2 2026.
• All of the 7.88Mn shares held by Cosan insiders are held directly, none through trusts, partnerships or other entities.
• Holdings in Cosan stock are reported by 3 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
• CSANY's three largest insider shareholders, per their latest Form 4 filings, are Marcelo Eduardo Martins (Chief Executive Officer, 5.09Mn shares), Maria Rita De Carvalho Drummond (2.52Mn shares) and Rafael Bergman (272.71K shares).
• Of the shares held by CSANY insiders, 64.60% belong to Marcelo Eduardo Martins.
• Over the past 12 months, 4 insiders reported transactions in Cosan stock in 7 Form 4 filings.
• These insider figures for Cosan are based on Form 4 filings through September 15, 2026.