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Cytosorbents Corp (NASDAQ:CTSO)
US · Delayed Price · Currency is USD
Healthcare · Medical - Devices
4.29-0.98 (-18.60%)
Market cap
$13.5M
Insider Score
Health Score
Analyst consensus
Listed since
Aug 8, 2006
Website
Insider Score
/ 100
CTSO Insider Score
Cytosorbents Corp has a live Insider Score.
Scored on 7 qualifying trades from 3 insiders in the last 90 days.
CTSO Stock Insider Trading Activity
CTSO stock’s insider trading shows 10 purchases for an estimated $269.33K by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days7 qualifying buys3 insiders$120.43K bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Sobel Alan D. Director | Buy | 100 | $6.01 | $601 | 1.0% | 9,887 | Sep 15, 2026 | DCluster BuyFirst Buy | Form 4 |
| Sobel Alan D. Director | Buy | 500 | $6.05 | $3.02K | 5.4% | 9,787 | Sep 15, 2026 | DCluster BuyFirst Buy | Form 4 |
| Sobel Alan D. Director | Buy | 1,900 | $6.12 | $11.63K | 25.7% | 9,287 | Sep 15, 2026 | CCluster BuyFirst Buy | Form 4 |
| Chan Phillip P. CEO | Buy | 3,774 | $6.00 | $22.64K | 3.9% | 100,996 | Sep 15, 2026 | CCluster BuyCEO Buy | Form 4 |
| Capponi Vincent COO | Buy | 273 | $5.90 | $1.61K | 0.7% | 40,387 | Sep 14, 2026 | CCluster BuyFirst Buy | Form 4 |
| Capponi Vincent COO | Buy | 1,800 | $6.07 | $10.93K | 4.7% | 40,114 | Sep 14, 2026 | BCluster BuyFirst Buy | Form 4 |
| Chan Phillip P. CEO | Buy | 200,000 | $0.35 | $70.00K | 11.5% | 1,944,432 | Sep 4, 2026 | BCluster BuyCEO Buy | Form 4 |
| Chan Phillip P. CEO | Buy | 10,333 | $0.43 | $4.44K | 0.6% | 1,744,432 | Jun 15, 2026 | CCEO Buy | Form 4 |
| MARIANI PETER J CFO | Buy | 100,000 | $0.44 | $44.00K | 18.6% | 638,113 | Jun 15, 2026 | BFirst BuyCFO Buy | Form 4 |
| Chan Phillip P. CEO | Buy | 251,136 | $0.40 | $100.45K | 16.9% | 1,734,099 | Jun 12, 2026 | BFirst BuyCEO Buy | Form 4 |
| Chan Phillip P. CEO | Award | 100,000 | $0.64 | $64.00K | 7.2% | 1,482,963 | Nov 18, 2025 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Buy (P) — Open-market or private purchase
- Award (A) — Grant or award from the company, not a purchase
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.