CSAN3
insider transactionsCosan S.A. — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
Net shares · 365d
+3.9M
4.0M buy · 187.0K sell
Net value · 365d
$23.0M
$23.8M in · $869.9K out
Sentiment · 365d
Net buying
96% buying · 4% selling
Open-market trades · 365d
6
4.0M buy · 187.0K sell
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
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Sell·S
Director
$267.1K
77.6K sh · $3.44
Own -100%
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Other·J
Chief Executive Officer
$12.5M
2.4M sh · $5.14
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Buy·P
Chief Executive Officer
$12.5M
2.4M sh · $5.14
Own +100%
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Other·J
Maria Rita De Carvalho Drummond
Chief Legal Officer
$1.4M
281.0K sh · $5.14
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Sell·S
Maria Rita De Carvalho Drummond
Chief Legal Officer
$204.9K
37.4K sh · $5.48
Own -2%
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Sell·S
Maria Rita De Carvalho Drummond
Chief Legal Officer
$198.5K
36.2K sh · $5.48
Own -2%
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Sell·S
Maria Rita De Carvalho Drummond
Chief Legal Officer
$199.4K
35.8K sh · $5.57
Own -2%
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Other·J
Chief Executive Officer
$10.9M
1.6M sh · $7.05
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Buy·P
Chief Executive Officer
$11.3M
1.6M sh · $7.05
Own +105%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| May 22, 2026 | Rubens Ometto Silveira Mello | Sell S | 77.6K | $267.1K |
| May 19, 2026 | Marcelo Eduardo Martins KEY | Other J | 2.4M | $12.5M |
| May 19, 2026 | Marcelo Eduardo Martins KEY | Buy P | 2.4M | $12.5M |
| May 19, 2026 | Maria Rita De Carvalho Drummond | Other J | 281.0K | $1.4M |
| Apr 17, 2026 | Maria Rita De Carvalho Drummond | Sell S | 37.4K | $204.9K |
| Apr 16, 2026 | Maria Rita De Carvalho Drummond | Sell S | 36.2K | $198.5K |
| Apr 15, 2026 | Maria Rita De Carvalho Drummond | Sell S | 35.8K | $199.4K |
| Apr 10, 2026 | Marcelo Eduardo Martins KEY | Other J | 1.6M | $10.9M |
| Apr 10, 2026 | Marcelo Eduardo Martins KEY | Buy P | 1.6M | $11.3M |
About CSAN3 insider trading
This page tracks insider transactions for Cosan S.A. (CSAN3) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.