Cytosorbents Corporation (CTSO) Insider Trading
Over the last 3 months, CTSO insiders made 3 open-market buys and 0 sales, a net purchase of $149K (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 24 institutions increased and 23 reduced their position (13F).
Insider Activity
Sentiment
100/100
Buys (3m)
3
Sells (3m)
0
Net (3m)
$148.9K
Insiders buyingCluster buying
Insider trades by month Buys Sells
Dec
May
Aug
Dec
Dec
Jun
Context3-month price -23.7%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 16, 2026 | MARIANI PETER Jofficer: Chief Financial Officer | Buy | 100,000 | $0.44 |
| Jun 15, 2026 | Chan Phillip P.director, officer: Chief Executive Officer | Buy | 251,136 | $0.40 |
| Jun 15, 2026 | Chan Phillip P.director, officer: Chief Executive Officer | Buy | 10,333 | $0.43 |
| Nov 20, 2025 | Chan Phillip P.director, officer: Chief Executive Officer | Grant | 100,000 | $0.64 |
| Aug 8, 2025 | Kim Jinydirector | Grant | 22,000 | $1.00 |
| Aug 8, 2025 | Deliargyris Efthymiosofficer: Chief Medical Officer | Grant | 70,000 | — |
| Aug 8, 2025 | Jones Edward Raymonddirector | Grant | 22,000 | $1.00 |
| Aug 8, 2025 | Chan Phillip P.director, officer: Chief Executive Officer | Grant | 105,600 | — |
| Aug 8, 2025 | Capponi Vincentofficer: President and COO | Grant | 89,100 | — |
| Aug 8, 2025 | Sobel Alan D.director | Grant | 22,000 | $1.00 |
| Aug 8, 2025 | Capponi Vincentofficer: President and COO | Grant | 111,100 | $1.00 |
| Aug 8, 2025 | MARIANI PETER Jofficer: Chief Financial Officer | Grant | 71,500 | — |
| Aug 8, 2025 | Chan Phillip P.director, officer: Chief Executive Officer | Grant | 136,400 | $1.00 |
| Aug 8, 2025 | BATOR MICHAEL G.director | Grant | 44,000 | $1.00 |
| Aug 8, 2025 | MARIANI PETER Jofficer: Chief Financial Officer | Grant | 90,000 | $1.00 |
| Aug 8, 2025 | Deliargyris Efthymiosofficer: Chief Medical Officer | Grant | 95,000 | $1.00 |
| Dec 16, 2024 | MARIANI PETER Jofficer: Chief Financial Officer | Buy | 20,000 | $0.96 |
| Dec 13, 2024 | MARIANI PETER Jofficer: Chief Financial Officer | Buy | 20,000 | $0.89 |
| Dec 13, 2024 | MARIANI PETER Jofficer: Chief Financial Officer | Buy | 11,363 | $0.89 |
| Oct 8, 2024 | Deliargyris Efthymiosofficer: Chief Medical Officer | Grant | 50,000 | $1.19 |
| Oct 8, 2024 | Capponi Vincentofficer: President and COO | Grant | 50,000 | $1.19 |
| Oct 8, 2024 | Capponi Vincentofficer: President and COO | Grant | 100,000 | $1.19 |
| Oct 8, 2024 | Deliargyris Efthymiosofficer: Chief Medical Officer | Grant | 100,000 | $1.19 |
| Aug 16, 2024 | MARIANI PETER Jofficer: Chief Financial Officer | Grant | 110,000 | — |
| Aug 16, 2024 | MARIANI PETER Jofficer: Chief Financial Officer | Grant | 175,000 | — |
| Aug 16, 2024 | MARIANI PETER Jofficer: Chief Financial Officer | Grant | 65,000 | — |
| Aug 16, 2024 | MARIANI PETER Jofficer: Chief Financial Officer | Grant | 215,000 | $0.90 |
| Aug 16, 2024 | MARIANI PETER Jofficer: Chief Financial Officer | Grant | 80,000 | $0.90 |
| Apr 4, 2024 | BLOCH KATHLEEN P.officer: Chief Financial Officer | Grant | 65,000 | — |
| Apr 4, 2024 | BLOCH KATHLEEN P.officer: Chief Financial Officer | Grant | 87,000 | $0.95 |
Source: CTSO SEC Form 4 filings, latest Jun 16, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their CTSO positions over the last 6 months (SEC Form 13F).
Increased
24
New positions
18
Reduced
23
Sold out
13
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| AVENIR CORP | Increased | 5.2M | Feb 13, 2026 |
| AVENIR CORP | Reduced | 5.2M | May 14, 2026 |
| VANGUARD GROUP INC | Unchanged | 2.2M | Jan 29, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.9M | May 15, 2026 |
| SKYLANDS CAPITAL, LLC | Reduced | 1.9M | Jan 30, 2026 |
| SKYLANDS CAPITAL, LLC | Reduced | 1.7M | Apr 22, 2026 |
| NEUBERGER BERMAN GROUP LLC | Increased | 1.7M | May 14, 2026 |
| NEUBERGER BERMAN GROUP LLC | Increased | 1.6M | Feb 13, 2026 |
| CM MANAGEMENT, LLC | Unchanged | 1.5M | May 8, 2026 |
| CM MANAGEMENT, LLC | Increased | 1.5M | Feb 2, 2026 |
| BLACKROCK, INC. | Increased | 783K | May 13, 2026 |
| BLACKROCK, INC. | Increased | 771K | Feb 12, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 707K | May 15, 2026 |
| SARGENT INVESTMENT GROUP, LLC | Reduced | 612K | Feb 13, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 604K | Feb 9, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.