CTSO · Insider trading · 13F holders · Congress trades
Cytosorbents Corp (CTSO)
Who is buying and selling CTSO: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 1
- Insider buys, 90 days
- $50K
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
CTSO at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 3 CTSO insiders filed 4 open-market purchases worth $50K on SEC Form 4.
- 1 13F filer hold CTSO among their 50 largest positions, worth $1.9M combined. The biggest bets by portfolio weight are Avenir Corp (0.2%).
- No member of Congress has disclosed a trade in CTSO.
- CTSO last closed at $4.40 on Oct 29, 2026.
CTSO insider trading
Between Aug 1, 2026 and Oct 29, 2026, 3 CTSO insiders filed 4 open-market purchases worth $50K on SEC Form 4.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Sep 16, 2026 | Chan Phillip P. | Chief Executive Officer, Director | Buy | 3,774 | $6.00 | $23K | SEC |
| Sep 16, 2026 | Sobel Alan D. | Director | Buy | 2,500 | $6.10 | $15K | SEC |
| Sep 16, 2026 | Capponi Vincent | President and COO | Buy | 2,073 | $6.05 | $13K | SEC |
| Sep 9, 2026 | Chan Phillip P. | Chief Executive Officer, Director | Buy | 200,000 | $0.35 | — | SEC |
Who owns CTSO? Hedge funds and superinvestors
1 13F filer hold CTSO among their 50 largest positions, worth $1.9M combined. The biggest bets by portfolio weight are Avenir Corp (0.2%).
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Avenir CorpWealth manager | 0.2% | $1.9M | 5,189,218 | -0.5% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 1). Screen CTSO in the grand portfolio →
CTSO stock trades by members of Congress
No member of Congress has disclosed a trade in CTSO.
CTSO questions and answers
Are insiders buying CTSO stock?
Between Aug 1, 2026 and Oct 29, 2026, 3 CTSO insiders filed 4 open-market purchases worth $50K on SEC Form 4.
Which hedge funds own CTSO?
1 13F filer hold CTSO among their 50 largest positions, worth $1.9M combined. The biggest bets by portfolio weight are Avenir Corp (0.2%).
Has Congress traded CTSO?
No member of Congress has disclosed a trade in CTSO.
Who is the largest holder of CTSO?
Among 13F filers, Avenir Corp reports the largest CTSO position, $1.9M (5,189,218 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Avenir Corp's: 0.2% of its portfolio.
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