Cytosorbents Ownership | Who Owns Cytosorbents?

Overview Forecast RevenueFinancials Chart Transcripts

Cytosorbents Ownership Summary

Cytosorbents is owned by 25.81% institutional investors, 15.60% insiders, and 58.59% retail investors. Avenir is the largest institutional shareholder, holding 8.12% 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	25.81%	15.60%	58.59%
Sector	Healthcare Stocks	232.51%	10.72%	-143.22%
Industry	Medical Device Stocks	33.21%	10.26%	56.53%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Avenir	5.08M	8.12%	$4.75M
Vanguard group	2.20M	3.51%	$1.41M
Skylands capital	1.85M	2.96%	$1.19M
Neuberger berman group	1.60M	2.55%	$1.49M
Cm management	1.48M	2.35%	$943.78K
Blackrock funding, inc. /de	770.55K	1.23%	$492.54K
Blackrock	655.80K	1.21%	$461.03K
Sargent investment group	738.70K	1.18%	$690.02K
Geode capital management	603.77K	0.96%	$386.03K
Pathstone	499.95K	0.80%	$319.57K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Cm management	1.48M	0.80%	$943.78K
Avenir	5.08M	0.49%	$4.75M
Skylands capital	1.85M	0.16%	$1.19M
Sargent investment group	738.70K	0.10%	$690.02K
Key client fiduciary advisors	78.46K	0.02%	$50.15K
Nwf advisory services	104.14K	0.01%	$97.27K
Seelaus asset management	17.30K	0.01%	$11.06K
Gsa capital partners llp	148.37K	0.01%	$95.00K
Two sigma securities	15.74K	0.00%	$14.70K
Pathstone	499.95K	0.00%	$319.57K

Top Buyers

Holder	Shares	% Assets	Change
Pathstone	499.95K	0.00%	499.95K
Cm management	1.48M	0.80%	188.37K
Waverly advisors	55.56K	0.00%	55.56K
Gsa capital partners llp	148.37K	0.01%	36.16K
Avenir	5.08M	0.49%	24.30K

Top Sellers

Holder	Shares	% Assets	Change
Granahan investment management	-	-	-358.42K
Skylands capital	1.85M	0.16%	-272.75K
Amh equity	-	-	-82.80K
Blackrock	655.80K	-	-66.63K
Engineers gate manager lp	-	-	-52.75K

New Positions

Holder	Shares	% Assets	Change	Value
Pathstone	499.95K	0.00%	499.95K	$319.57K
Waverly advisors	55.56K	0.00%	55.56K	$51.90K
Texas capital bank wealth management services	11.00K	0.00%	11.00K	$7.03K
Global retirement partners	2.27K	-	2.27K	$1.45K
Rockefeller capital management	1.00K	-	1.00K	$934.00

Sold Out

Holder	Change
Qube research	-1.00
Sbi securities	-1.00
Allworth financial lp	-37.00
Fmr	-285.00
Lazard asset management	-1.09K

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	2	-96.08%	381,533	-97.51%	-	0.09%	1	-95.83%	1	-90.91%
Dec 31, 2024	50	-5.66%	15,327,094	-6.70%	28	3.09%	23	35.29%	11	-15.38%

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	2.04%	-27.85K
M&G (ACS) Granahan US Sm Cp Gr GBPZ1AAcc	763.50K	1.40%	-101.78K
Neuberger Berman Intrinsic Value I	674.87K	1.08%	-
Vanguard Institutional Extnd Mkt Idx Tr	510.72K	0.82%	-232.72K
Fidelity Extended Market Index	303.62K	0.48%	-2.50K
iShares Micro-Cap ETF	131.80K	0.21%	-
JNL Multi-Manager Small Cap Growth A	124.74K	0.20%	-310.82K
BlackRock Extended Equity Market K	103.38K	0.19%	-44.00
Neuberger Berman Small Cap Intrinsic Val	112.06K	0.18%	-11.40K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Dec 13, 2024	MARIANI PETER J	Chief Financial Officer	Buy	$19.29K
Dec 12, 2024	MARIANI PETER J	Chief Financial Officer	Buy	$17.87K
Dec 11, 2024	MARIANI PETER J	Chief Financial Officer	Buy	$10.10K
Dec 13, 2023	Sobel Alan D.	-	Buy	$30.00K
Dec 13, 2023	Sobel Alan D.	-	Buy	$15.79K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	-
2025 Q3	-	-
2025 Q1	-	-
2024 Q4	3	-
2024 Q3	-	-

CTSO Ownership FAQ

Who Owns Cytosorbents?

Cytosorbents shareholders are primarily institutional investors at 25.81%, followed by 15.60% insiders and 58.59% retail investors. The average institutional ownership in Cytosorbents's industry, Medical Device Stocks, is 33.21%, which Cytosorbents falls below.

Who owns the most shares of Cytosorbents?

Cytosorbents’s largest shareholders are Avenir (5.08M shares, 8.12%), Vanguard group (2.2M shares, 3.51%), and Skylands capital (1.85M shares, 2.96%). Together, they hold 14.59% 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 0.80% of its assets in 1.48M Cytosorbents shares, valued at 943.78K$.

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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