CTSO insider buying
2 cluster buysCytosorbents Corp
When two or more insiders at Cytosorbents Corp buy CTSO on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in CTSO plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.
Detected clusters
- Sep 4 – Sep 15, 2026Detected Sep 16, 2026High conviction3 insidersTotal bought$120.4KMarket capUnknown
- Sep 4 – Sep 15, 2026Detected Sep 16, 2026High conviction3 insidersTotal bought$97.8KMarket capUnknown
All notable open-market buys in CTSO
Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.
| Date | Insider | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Sep 15, 2026 | Chan Phillip P.cluster Director, Chief Executive Officer | 3,774 | $6.00 | $22.6K | SEC ↗ |
| Sep 15, 2026 | Sobel Alan D.cluster Director | 1,900 | $6.12 | $11.6K | SEC ↗ |
| Sep 15, 2026 | Sobel Alan D.cluster Director | 500 | $6.05 | $3.0K | SEC ↗ |
| Sep 15, 2026 | Sobel Alan D.cluster Director | 100 | $6.01 | $601.0 | SEC ↗ |
| Sep 14, 2026 | Capponi Vincentcluster President and COO | 1,800 | $6.07 | $10.9K | SEC ↗ |
| Sep 14, 2026 | Capponi Vincentcluster President and COO | 273 | $5.90 | $1.6K | SEC ↗ |
| Sep 4, 2026 | Chan Phillip P.cluster Director, Chief Executive Officer | 200,000 | $0.35 | $70.0K | SEC ↗ |
| Jun 12, 2026 | Director, Chief Executive Officer | 251,136 | $0.40 | $100.5K | SEC ↗ |
| Dec 13, 2024 | Chief Financial Officer | 20,000 | $0.96 | $19.2K | SEC ↗ |
| Dec 12, 2024 | Chief Financial Officer | 20,000 | $0.89 | $17.8K | SEC ↗ |
| Dec 11, 2024 | Chief Financial Officer | 11,363 | $0.89 | $10.1K | SEC ↗ |
CTSO insider buying — FAQ
- Are insiders buying CTSO stock?
- Yes — 4 distinct insiders have bought CTSO (Cytosorbents Corp) on the open market, including 2 cluster buys where two or more insiders bought within a rolling window. The most recent qualifying activity was Sep 16, 2026.
- How much CTSO stock have insiders bought?
- Insiders have bought a combined $268.0K of CTSO across 11 open-market purchases, based on SEC Form 4 filings.
- What is an insider cluster buy in CTSO?
- A cluster buy is two or more distinct Cytosorbents Corp insiders — officers, directors, or 10% owners — each buying CTSO on the open market within a rolling window. CTSO has 2 detected cluster buys to date.
- Where does this CTSO insider trading data come from?
- Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.
How we track insider buying in CTSO
We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy CTSO within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?
This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding CTSO.