CTSO
insider transactionsCytosorbents Corp — 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).
Cluster buy signal: Multiple insiders at the same company buying around the same time — often a stronger signal than a single buy. 2 different insiders made open-market purchases in the last 365 days, totalling $148.9K.
Net shares · 365d
+361.5K
361.5K buy · 0 sell
Net value · 365d
$148.9K
$148.9K in · $0 out
Sentiment · 365d
Net buying
100% buying · 0% selling
Open-market trades · 365d
3
361.5K buy · 0 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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Buy·P
Phillip P. Chan KEY
Chief Executive Officer
$4.4K
10.3K sh · $0.43
Own +1%
-
Buy·P
Peter J Mariani KEY
Chief Financial Officer
$44.0K
100.0K sh · $0.44
Own +19%
-
Buy·P
Phillip P. Chan KEY
Chief Executive Officer
$100.5K
251.1K sh · $0.40
Own +17%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Jun 15, 2026 | Phillip P. Chan KEY | Buy P | 10.3K | $4.4K |
| Jun 15, 2026 | Peter J Mariani KEY | Buy P | 100.0K | $44.0K |
| Jun 12, 2026 | Phillip P. Chan KEY | Buy P | 251.1K | $100.5K |
About CTSO insider trading
This page tracks insider transactions for Cytosorbents Corp (CTSO) 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.