Cytosorbents Ownership | Who Owns Cytosorbents?

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Cytosorbents Ownership Summary

Cytosorbents is owned by 25.69% institutional investors, 15.72% insiders, and 58.59% retail investors. Avenir is the largest institutional shareholder, holding 8.38% of CTSO shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 2.08% of its assets in Cytosorbents shares.

CTSO Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Cytosorbents	25.69%	15.72%	58.59%
Sector	Healthcare Stocks	245.07%	12.10%	-157.17%
Industry	Medical Device Stocks	52.73%	12.62%	34.65%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Avenir	5.22M	8.38%	$2.95M
Vanguard group	2.20M	3.51%	$1.41M
Skylands capital	1.71M	2.74%	$966.96K
Neuberger berman group	1.68M	2.70%	$950.78K
Cm management	1.48M	2.37%	$836.14K
Blackrock funding, inc. /de	782.99K	1.26%	$443.41K
Blackrock	655.80K	1.21%	$461.03K
Geode capital management	707.26K	1.14%	$400.62K
Sargent investment group	549.90K	0.88%	$311.41K
Pathstone	499.95K	0.80%	$283.12K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Cm management	1.48M	0.70%	$836.14K
Avenir	5.22M	0.36%	$2.95M
Skylands capital	1.71M	0.13%	$966.96K
Sargent investment group	549.90K	0.04%	$311.41K
Key client fiduciary advisors	78.46K	0.02%	$44.43K
Seelaus asset management	16.30K	0.01%	$9.23K
Nwf advisory services	104.14K	0.01%	$58.97K
Two sigma securities	15.74K	0.00%	$14.70K
Marathon capital management	10.00K	0.00%	$5.66K
Pathstone	499.95K	0.00%	$283.12K

Top Buyers

Holder	Shares	% Assets	Change
Vanguard fiduciary trust	313.86K	-	313.86K
Geode capital management	707.26K	-	103.50K
Neuberger berman group	1.68M	0.00%	57.37K
Ritholtz wealth management	27.44K	0.00%	27.44K
Two sigma securities	15.74K	0.00%	15.74K

Top Sellers

Holder	Shares	% Assets	Change
Granahan investment management	-	-	-358.42K
Gsa capital partners llp	-	-	-148.37K
Skylands capital	1.71M	0.13%	-147.02K
Amh equity	-	-	-82.80K
Blackrock	655.80K	-	-66.63K

New Positions

Holder	Shares	% Assets	Change	Value
Vanguard fiduciary trust	313.86K	-	313.86K	$177.64K
Ritholtz wealth management	27.44K	0.00%	27.44K	$15.54K
Hrt financial lp	14.11K	-	14.11K	$7.00K
Vanguard global advisers	13.87K	-	13.87K	$7.85K
Marathon capital management	10.00K	0.00%	10.00K	$5.66K

Sold Out

Holder	Change
Qube research	-1.00
Sbi securities	-1.00
Allworth financial lp	-37.00
Jones financial companies lllp	-93.00
Mai capital management	-233.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	51	2.00%	16,137,911	-2.02%	25	3.73%	20	5.26%	13	8.33%
Mar 31, 2026	38	-25.49%	15,158,722	-10.11%	24	3.37%	15	-34.78%	9	-10.00%
Dec 31, 2025	38	-22.45%	16,197,322	-1.88%	25	3.71%	17	-22.73%	8	-20.00%
Sep 30, 2025	48	9.09%	16,334,989	-0.63%	26	3.78%	22	100.00%	10	-44.44%
Jun 30, 2025	42	-14.29%	16,329,093	-3.59%	26	3.35%	11	-52.17%	18	80.00%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	1.30M	2.08%	-
Vanguard Total Stock Mkt Idx Inv	1.27M	2.03%	-
Vanguard Morn Total Stk Mkt Idx Investor	1.27M	2.03%	-
Vanguard MStar Total Stk Mkt Idx Invest	1.27M	2.03%	-
M&G (ACS) Granahan US Sm Cp Gr GBPZ1AAcc	763.50K	1.40%	-101.78K
Neuberger Berman Intrinsic Value I	674.87K	1.08%	-
Neuberger Intrinsic Value I	646.51K	1.03%	-
Vanguard Institutional Extnd Mkt Idx Tr	574.46K	0.91%	-
Fidelity Extended Market Index	292.83K	0.47%	-87.44K
iShares Micro-Cap ETF	144.52K	0.23%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 15, 2026	Chan Phillip P.	Chief Executive Officer	Buy	$22.64K
Sep 14, 2026	Capponi Vincent	President and COO	Buy	$10.93K
Sep 14, 2026	Capponi Vincent	President and COO	Buy	$1.61K
Sep 15, 2026	Sobel Alan D.	-	Buy	$601.00
Sep 15, 2026	Sobel Alan D.	-	Buy	$3.02K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	7	-
2026 Q2	3	-
2025 Q4	-	-
2025 Q3	-	-
2025 Q1	-	-

CTSO Ownership FAQ

Who Owns Cytosorbents?

Cytosorbents shareholders are primarily institutional investors at 25.69%, followed by 15.72% insiders and 58.59% retail investors. The average institutional ownership in Cytosorbents's industry, Medical Device Stocks, is 52.73%, which Cytosorbents falls below.

Who owns the most shares of Cytosorbents?

Cytosorbents’s largest shareholders are Avenir (5.22M shares, 8.38%), Vanguard group (2.2M shares, 3.51%), and Skylands capital (1.71M shares, 2.74%). Together, they hold 14.64% of Cytosorbents’s total shares outstanding.

Does Blackrock own Cytosorbents?

Yes, BlackRock owns 1.21% of Cytosorbents, totaling 655.8K shares as of Jun 2024. This represents 0% of BlackRock's total assets, with a market value of 461.03K$. In the last quarter, BlackRock decreased its holdings by -66.63K shares, a -9.22% change.

Who is Cytosorbents’s biggest shareholder by percentage of total assets invested?

Cm management is Cytosorbents’s biggest shareholder by percentage of total assets invested, with 0.70% of its assets in 1.48M Cytosorbents shares, valued at 836.14K$.

Who is the top mutual fund holder of Cytosorbents shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Cytosorbents shares, with 2.08% of its total shares outstanding invested in 1.3M Cytosorbents shares.

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