Cosan's top three insider shareholders as of September 29, 2026 are Marcelo Eduardo Martins (Chief Executive Officer, 5.09Mn shares), Maria Rita De Carvalho Drummond (Chief Legal Officer, 2.52Mn shares), Marcelo Eduardo Martins (Chief Executive Officer, 2.07Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Marcelo Eduardo Martins | Chief Executive Officer | 7,165,262 | 0 | 7,165,262 | 72.0% | 12 Aug, 2026 |
| 2 | Maria Rita De Carvalho Drummond | Chief Legal Officer | 2,516,572 | 0 | 2,516,572 | 25.3% | 15 Sep, 2026 |
| 3 | Rafael Bergman | Other | 272,714 | 0 | 272,714 | 2.7% | 15 Sep, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 10 Aug, 2026 | Maria Rita De Carvalho Drummond | Chief Legal Officer | Acquired J | 103,765 | $3.99 | $414.02K | 2,407,459 | Direct |
| 10 Aug, 2026 | Marcelo Eduardo Martins | Chief Executive Officer | Acquired J | 276,475 | $3.99 | $1.10Mn | 5,090,732 | Direct |
| 10 Aug, 2026 | Maria Rita De Carvalho Drummond | Chief Legal Officer | Disposed J | 103,765 | $3.99 | $414.02K | 304,490 | Direct |
| 10 Aug, 2026 | Marcelo Eduardo Martins | Chief Executive Officer | Disposed J | 276,475 | $3.99 | $1.10Mn | 2,074,530 | Direct |
| 22 May, 2026 | Rubens Ometto Silveira Mello | Director | Disposed S | 77,640 | $3.44 | $267.08K | 0 | Indirect |
| 15 Apr, 2026 | Maria Rita De Carvalho Drummond | Chief Legal Officer | Disposed S | 35,800 | $5.57 | $199.41K | 2,202,136 | Direct |
| 10 Apr, 2026 | Marcelo Eduardo Martins | Chief Executive Officer | Acquired P | 1,599,086 | $7.05 | $11.27Mn | 3,120,178 | Direct |
| 19 May, 2026 | Marcelo Eduardo Martins | Chief Executive Officer | Acquired P | 2,441,528 | $5.14 | $12.55Mn | 4,890,286 | Direct |
| 16 Apr, 2026 | Maria Rita De Carvalho Drummond | Chief Legal Officer | Disposed S | 36,200 | $5.48 | $198.49K | 2,165,936 | Direct |
| 17 Apr, 2026 | Maria Rita De Carvalho Drummond | Chief Legal Officer | Disposed S | 37,400 | $5.48 | $204.91K | 2,128,536 | Direct |
| 10 Apr, 2026 | Marcelo Eduardo Martins | Chief Executive Officer | Disposed J | 1,552,511 | $7.05 | $10.94Mn | 4,794,842 | Direct |
| 19 May, 2026 | Maria Rita De Carvalho Drummond | Chief Legal Officer | Acquired J | 280,954 | $5.14 | $1.44Mn | 2,332,228 | Direct |
| 19 May, 2026 | Marcelo Eduardo Martins | Chief Executive Officer | Disposed J | 2,441,528 | $5.14 | $12.55Mn | 2,353,314 | Direct |
| 19 May, 2026 | Maria Rita De Carvalho Drummond | Chief Legal Officer | Disposed J | 280,954 | $5.14 | $1.44Mn | 409,122 | Direct |