CTSO insider buying and SEC filings, explained
Cytosorbents Corp · CIK 1175151
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$269K
Insiders who bought
4
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Sep 15, 2026 | Open-market purchase | Phillip P. Chan (CEO and Director) bought 3,774 shares at $6.00 ($23K) in an open-market purchase. Holdings up 4% to 100,996 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 16, 2026 |
| Sep 15, 2026 | Open-market purchase | Alan D. Sobel (Director) bought 2,500 shares at about $6.10 ($15K) in an open-market purchase. Holdings up 34% to 9,887 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 16, 2026 |
| Sep 14, 2026 | Open-market purchase | Vincent Capponi (President / COO) bought 2,073 shares at about $6.05 ($13K) in an open-market purchase. Holdings up 5% to 40,387 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 16, 2026 |
| Sep 4, 2026 | Open-market purchase | Phillip P. Chan (CEO and Director) bought 200,000 shares at about $0.3500 ($70K) in an open-market purchase. Holdings up 11% to 1,944,432 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 9, 2026 |
| Jun 15, 2026 | Open-market purchase | Peter J. Mariani (CFO) bought 100,000 shares at about $0.4400 ($44K) in an open-market purchase. Holdings up 19% to 638,113 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 16, 2026 |
| Jun 12–15, 2026 | Open-market purchase | Phillip P. Chan (CEO and Director) bought 261,469 shares between Jun 12 and Jun 15 at about $0.4012 ($105K) in an open-market purchase. Holdings up 18% to 1,744,432 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 15, 2026 |
1 routine transaction (such as a grant, option exercise or tax withholding) is not listed.
Cluster buys
3 insiders bought in 30 days
$120K in purchases since Sep 4, 2026 · Purchases traded Sep 4, 2026 to Sep 15, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Phillip P. Chan (CEO) | $70K | Sep 4, 2026 | SEC filing |
| Vincent Capponi (President / COO) | $13K | Sep 14, 2026 | SEC filing |
| Alan D. Sobel (Director) | $15K | Sep 15, 2026 | SEC filing |
| Phillip P. Chan (CEO) | $23K | Sep 15, 2026 | SEC filing |
2 insiders bought in 30 days
$149K in purchases since Jun 15, 2026 · Purchases traded Jun 15, 2026 to Jun 15, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Phillip P. Chan (CEO) | $105K | Jun 15, 2026 | SEC filing |
| Peter J. Mariani (CFO) | $44K | Jun 15, 2026 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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