Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in CTSO held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | AVENIR CORP | 5.2M | $3.0M | -0.3% | 8.306% | 0.36% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 1.9M | $1.1M | — | 2.994% | 0.00% |
| 3 | Skylands Capital, LLC | 1.7M | $967K | -7.9% | 2.719% | 0.13% |
| 4 | Neuberger Berman Group LLC | 1.7M | $951K | +3.5% | 2.680% | 0.00% |
| 5 | CM Management, LLC | 1.5M | $836K | 0.0% | 2.351% | 0.70% |
| 6 | BlackRock, Inc. | 783K | $443K | +1.6% | 1.247% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 707K | $401K | +17.1% | 1.126% | 0.00% |
| 8 | Sargent Investment Group, LLC | 550K | $311K | -10.2% | 0.876% | 0.04% |
| 9 | Pathstone Holdings, LLC | 500K | $283K | 0.0% | 0.796% | 0.00% |
| 10 | VANGUARD FIDUCIARY TRUST CO | 314K | $178K | — | 0.500% | 0.00% |
| 11 | CIBC Bancorp USA Inc. | 173K | $98K | — | 0.275% | 0.00% |
| 12 | STATE STREET CORP | 159K | $90K | 0.0% | 0.254% | 0.00% |
| 13 | ADVISOR GROUP HOLDINGS, INC. | 130K | $74K | 0.0% | 0.208% | 0.00% |
| 14 | UBS Group AG | 115K | $65K | -0.1% | 0.183% | 0.00% |
| 15 | RAYMOND JAMES FINANCIAL INC | 108K | $61K | -0.9% | 0.172% | 0.00% |
| 16 | NWF Advisory Services Inc. | 104K | $59K | — | 0.166% | 0.01% |
| 17 | RENAISSANCE TECHNOLOGIES LLC | 101K | $57K | +0.6% | 0.160% | 0.00% |
| 18 | MORGAN STANLEY | 100K | $57K | -14.0% | 0.160% | 0.00% |
| 19 | NORTHERN TRUST CORP | 93K | $52K | 0.0% | 0.147% | 0.00% |
| 20 | Key Client Fiduciary Advisors, LLC | 78K | $44K | 0.0% | 0.125% | 0.02% |
| 21 | Warren Averett Asset Management, LLC | 56K | $31K | 0.0% | 0.089% | 0.00% |
| 22 | STIFEL FINANCIAL CORP | 48K | $27K | 0.0% | 0.076% | 0.00% |
| 23 | GOLDMAN SACHS GROUP INC | 44K | $25K | +22.2% | 0.070% | 0.00% |
| 24 | BANK OF AMERICA CORP /DE/ | 39K | $22K | +1.1% | 0.062% | 0.00% |
| 25 | XTX Topco Ltd | 36K | $20K | +19.8% | 0.057% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in CTSO — a direct measure of their conviction.
Filings activity in CTSO during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 50 | +2.0% | 37.11% | 5.16 pp | $9M | 12% |
| Q4 2025 | 49 | +0.0% | 42.27% | 18.72 pp | $11M | 31% |
| Q3 2025 | 49 | +8.9% | 60.99% | 21.37 pp | $15M | 26% |
| Q2 2025 | 45 | 6.3% | 82.36% | +15.20 pp | $21M | +23% |
| Q1 2025 | 48 | 5.9% | 67.16% | +10.68 pp | $17M | +19% |
| Q4 2024 | 51 | 1.9% | 56.48% | 41.47 pp | $14M | 42% |
| Q3 2024 | 52 | +4.0% | 97.95% | +51.21 pp | $25M | +110% |
| Q2 2024 | 50 | — | 46.74% | — | $12M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as the highest-conviction signal because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Jun 15, 2026 | MARIANI PETER J | Buy | 100K | $0.44 | $44K |
Quick answers to the most common questions about buying CTSO stock.
Based on Q1 2026 13F filings, institutional ownership of Cytosorbents Corporation stands at 37.1%, held across 50 reporting institutions.
AVENIR CORP is the largest reported institutional holder of CTSO, with approximately 5,215,776 shares worth $0.00B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of CTSO, including RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for CTSO is 40 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
12 institutions opened new positions in CTSO during Q1 2026, while 11 fully exited. 3 added to existing positions and 35 trimmed.
CTSO institutional ownership fell by 5.16 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 90.0% of all reported 13F value in CTSO, and the top 25 account for 98.4%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Cytosorbents Corporation (CTSO) Institutional Ownership