Cytosorbents (CTSO): which funds own it

Who owns Cytosorbents?

Holders reporting more than 5% of the shares to the SEC (Schedules 13D/13G): Avenir, 8.3% (13G/A filed Feb 13, 2026), Thomas A. Satterfield, Jr., 6.6% (13G filed Jan 17, 2025) and Avenue Capital Management II, 5.7% (13G filed May 28, 2025). As of Jun 30, 2026, the largest holders reported on Form 13F were Avenir (8.3% of the shares), Neuberger Berman Group (3.1%) and Vanguard Capital Management (3.0%).

Sources:13G/A by Avenir (Feb 13, 2026) ↗13G by Thomas A. Satterfield, Jr. (Jan 17, 2025) ↗13G by Avenue Capital Management II (May 28, 2025) ↗All of the company's proxy statements on EDGAR ↗

13F percentages divide the shares each institution reports by the shares outstanding on the cover of the company's latest report before the quarter end (May 7, 2026). Entities of the same group file separately and are not added up. We hold 13D and 13G filings made since Dec 23, 2024: a holder above 5% that has not filed since then does not appear here.

• Avenirconcentrated5.2 MType not verified · 8.26% of the company−27 K
• Neuberger Berman Group2.0 MInvestment firm · 3.13% of the company+286 K
• Vanguard Capital Management1.9 MIndex manager · 3.05% of the company+34 K
• CM Management1.5 MType not verified · 2.35% of the company0
• Skylands Capital1.2 MType not verified · 1.93% of the company−496 K
• BlackRock627 KIndex manager · 1.00% of the company−156 K
• Geode Capital Management602 KIndex manager · 0.96% of the company−105 K
• Sargent Investment Group556 KType not verified · 0.88% of the company+5,857
• Pathstone Holdings500 KWealth adviser · 0.80% of the company−45
• Vanguard Fiduciary Trust316 KIndex manager · 0.50% of the company+2,311

The 10 13F filers with the most shares as of Jun 30, 2026, whatever their type (index firms usually come first). “Change”: shares added or cut versus the previous quarter, split-adjusted; “no data” = there is no comparable portfolio for the previous quarter (no filing, or a filing with its holdings under confidential treatment). “% of the company” only where shares outstanding are up to date. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. With a free account: the top 25, the largest buyers and the largest sellers.

Held by institutions (13F)

Institutions (13F): 25.7% of the shares · top 10: 22.9% · in index firms: 23.2% of the institutional total

Shares reported by the 49 13F filers as of Jun 30, 2026, divided by the shares outstanding on the cover of the company's latest report (May 7, 2026). It is not all institutional ownership: only managers above $100M file a 13F, and it excludes short positions. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. We only publish it where the figure is credible: not for ADRs, companies with more than one share class or stale shares-outstanding data.

Shares outstanding: buybacks and dilution

From the statements the company filed with the SEC (10-K). The change compares average diluted shares of each fiscal year, on today's basis: negative = it bought back more than it issued; positive = dilution. “No data” = the company does not report that item under a tag we can read; it does not mean zero.

Earnings quality and debt

From the figures the company filed with the SEC. Cash flow over net income near or above 1 means earnings are collected in cash; far below, that part is accounting. Coverage says how many times operating income pays the latest fiscal year's interest. Maturities come from the debt note of the latest annual report, counted from its closing date. “No data” never means zero.

Above 5% over time (13D/13G)

Each holder with its filings in order. History since December 2024.