Cosan S.A. Stock: price and insider trades · Brazil

This page follows insider dealings at Cosan S.A. as filed with CVM (Brazil), a company from the Energy sector based in São Paulo, Brazil. The group dates from 1936. Over the twelve months to 23 October 2026, 111 filings were filed, from 9 insiders.

Open-market activity splits into 24 purchases totalling €26.1M and 56 sales totalling €6.8M; 4 insiders sit on the buying side and 5 insiders on the selling side. The totals do not cover 1 filing with an undisclosed amount. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. Martins Marcelo Eduardo filed the largest purchase, €10.8M, on 21 May 2026, which represents 0.52% of the company's market value. Among those who bought: 2 senior executives, 1 board member and 1 chief executive.

The data flag 3 purchases as part of a group of insiders buying within 30 days of each other. Such overlaps are known as a cluster signal: distinct people reaching the same decision at about the same time. The latest purchase dates back some time: it was published 39 days ago, on 15 September 2026. Filings reach the CVM (Brazil) feed a median of 33 days after the trade. Until a filing is published, the market cannot know about the trade. Sales are harder to read than purchases, since they often meet personal needs such as tax or diversification.

With 111 filings in twelve months, the company is more active than the median of 23 filings across the 343 companies we follow on the same exchange. Since 2019, the database holds 176 purchases and 257 sales by insiders of the company.

Elsewhere in the same sector, our signals recently picked up insider purchases at Compagnie de l'Odet and E.ON SE. This summary is built from CVM (Brazil) disclosures alone and does not predict where the share price will go.