Here are the Form 4 insider transactions from Cosan S.A. (CSAN) in our archive over the last 12 months, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow CSAN and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full CSAN filings page.
Cosan S.A. (CSAN) reported that former Chief Finance Officer Rafael Bergman reclassified 55,242 shares on September 11, 2026, moving them from a Long-Term Incentive Program into directly held common stock at a reference value of 3.9 Brazilian reais per share. After this non-market restructuring, he directly holds 272,714 common shares.
Cosan S.A. (CSAN) reported that former Chief Legal Officer Maria Rita de Carvalho Drummond reclassified 150,496 shares tied to a Long-Term Incentive Program into directly held common stock on September 11, 2026, at a reference price of 3.90 Brazilian reais per share, with no net change in her economic exposure. Following this internal restructuring, she directly holds 2,516,572 common shares and 672,888 American Depositary Shares, with each ADS representing four common shares; no transactions were reported under a Rule 10b5-1 trading plan.
Cosan S.A. (CSAN) director Cordes Burkhard Otto reported indirect open‑market purchases of a total of 159,000 common shares (BVMF: CSAN3) on May 18 and May 26, 2026 through fund DGF UBER ALLES FIM CP IE, at prices in Brazilian reais. The filing also reports direct holdings of 42,332 common shares and 857,610 ADSs, each ADS representing four common shares. No Rule 10b5‑1 trading plan is reported, and the Form 4 was refiled to correct the issuer CIK.
Cosan S.A. Chief Legal Officer Maria Rita de Carvalho Drummond reported an internal restructuring of equity holdings coded as "other acquisition or disposition." On 2026-08-10, she shifted 103,765 units at BRL 3.99 between directly held common stock and a Long-Term Incentive Program, with no net change in total shares. Following these movements, she directly holds 2,407,459 common shares, 304,490 Long-Term Incentive Program shares, and 672,888 ADSs, each ADS representing four common shares.
Cosan S.A. Chief Executive Officer Marcelo Eduardo Martins reported a restructuring of his equity holdings in the company on August 10, 2026. He recorded an acquisition of 276,475 shares of common stock (BVMF: CSAN3) at 3.99 Brazilian reais per share, bringing his directly held common shares to 5,090,732. A corresponding entry shows an adjustment to his Long-Term Incentive position tied to CSAN3, now reflecting 2,074,530 units subject to vesting and performance conditions. He also reported direct ownership of 1,613,666 ADSs, with each American Depositary Share representing four shares of common stock.
Cosan S.A. director Mello Rubens Ometto Silveira, through an associated entity, reported an indirect open-market sale of 77,640 shares of Common Stock at $3.44 per share. These shares were held indirectly through Rio das Pedras Acoes, which reported zero shares following the transaction.
The filing also shows large indirect holdings in Cosan through other entities, with 109,532,616 shares held via Queluz Holdings Limited and 712,702,674 shares held via Aguassanta Participacoes S.A. Common stock is represented by American Depositary Shares, with each ADS equal to four Common shares.
Cosan S.A. Chief Executive Officer Marcelo Eduardo Martins reported substantial open-market share purchases alongside adjustments to his long-term incentive holdings. On April 10, he bought 1,599,086 shares of common stock (BVMF: CSAN3) at 7.0482 per share, lifting his direct common stock position to 3,120,178 shares. On May 19, he purchased another 2,441,528 common shares at 5.14 per share, increasing his direct common stock holdings to 4,890,286 shares.
On the same dates, Form 4 records J-code “other” transactions in Long Term Incentive entries linked to Cosan’s Long-Term Incentive Programs, covering 1,552,511 shares on April 10 and 2,441,528 shares on May 19. A separate line shows direct holdings of 1,613,666 Cosan ADSs as of April 10, with each ADS representing four common shares.
Cosan S.A. Chief Legal Officer Maria Rita de Carvalho Drummond reported multiple share movements in Cosan stock and incentive awards. On April 15–17, 2026, she completed three open-market sales totaling 109,400 shares of common stock (BVMF: CSAN3) at prices around R$5.48–R$5.57 per share.
On May 19, 2026, she recorded an “other” transaction involving 280,954 long-term incentive shares and a related 280,954 common stock entry, tied to Cosan’s long-term incentive programs. After these actions, she directly holds 2,332,228 common shares, 409,122 long-term incentive shares, and 672,888 American Depositary Shares, with each ADS representing four common shares.