Cytosorbents Ownership | Who Owns Cytosorbents?

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Cytosorbents Ownership Summary

Cytosorbents is owned by 26.09% institutional investors, 15.44% insiders, and 58.47% 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	26.09%	15.44%	58.47%
Sector	Healthcare Stocks	42.50%	10.81%	46.69%
Industry	Medical Device Stocks	37.66%	10.02%	52.32%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Avenir	5.08M	8.12%	$4.75M
Vanguard group	2.20M	3.52%	$2.06M
Skylands capital	2.13M	3.40%	$1.99M
Neuberger berman group	1.60M	2.55%	$1.49M
Cm management	1.29M	2.06%	$1.20B
Blackrock funding, inc. /de	764.81K	1.22%	$714.41K
Blackrock	655.80K	1.21%	$461.03K
Sargent investment group	738.70K	1.18%	$690.02K
Geode capital management	601.45K	0.96%	$561.98K
Cibc private wealth group	172.65K	0.28%	$220.99K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Cm management	1.29M	1.00%	$1.20B
Avenir	5.08M	0.49%	$4.75M
Skylands capital	2.13M	0.27%	$1.99M
Sargent investment group	738.70K	0.10%	$690.02K
Key client fiduciary advisors	78.46K	0.02%	$73.29K
Seelaus asset management	17.30K	0.01%	$16.16K
Nwf advisory services	104.14K	0.01%	$97.27K
Gsa capital partners llp	112.22K	0.01%	$105.00K
Two sigma securities	15.74K	0.00%	$14.70K
Neuberger berman group	1.60M	0.00%	$1.49M

Top Buyers

Holder	Shares	% Assets	Change
Gsa capital partners llp	112.22K	0.01%	112.22K
Vanguard group	2.20M	-	79.53K
Waverly advisors	55.56K	0.00%	55.56K
Cm management	1.29M	1.00%	38.13K
Avenir	5.08M	0.49%	24.30K

Top Sellers

Holder	Shares	% Assets	Change
Skylands capital	2.13M	0.27%	-489.45K
Granahan investment management	-	-	-358.42K
Amh equity	-	-	-82.80K
Blackrock	655.80K	-	-66.63K
Engineers gate manager lp	-	-	-52.75K

New Positions

Holder	Shares	% Assets	Change	Value
Waverly advisors	55.56K	0.00%	55.56K	$51.90K
Lpl financial	14.91K	-	14.91K	$13.92K
Centiva capital, lp	10.74K	0.00%	10.74K	$10.03K
Rockefeller capital management	1.00K	-	1.00K	$934.00
Jones financial companies lllp	593.00	-	593.00	$553.00

Sold Out

Holder	Change
Qube research	-1.00
Allworth financial lp	-37.00
Fmr	-285.00
Lazard asset management	-1.09K
New wave wealth advisors	-1.63K

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Sep 30, 2024	53	8.16%	16,427,732	-1.05%	30	3.22%	17	54.55%	13	-23.53%

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 26.09%, followed by 15.44% insiders and 58.47% retail investors. The average institutional ownership in Cytosorbents's industry, Medical Device Stocks, is 37.66%, 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, 3.52%), and Skylands capital (2.13M shares, 3.40%). Together, they hold 15.04% 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 1.00% of its assets in 1.29M Cytosorbents shares, valued at 1.2B$.

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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