CTSO · Cytosorbents Corp · Holdings

$5.32 +0.36 (+7.26%)

Market Cap

$15.58M

3.14M

Volume · Oct 20 79.22K Avg daily vol (30 sessions) 44.8K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP → See every holder of CTSO: 13F, 13D and 13G, insiders and funds →

Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.

The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.

Quarter:

Holders: 48

Total Value: $5,966,255

Total Shares: 15,952,540

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 51 13F filers

Top Holder

32.1%

of institutional value

Top 5

72.8%

of institutional value

Top 10

88.9%

of institutional value

HHI

1,522

Moderately concentrated

Who Holds CTSO

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 47 filers, like-for-like change -2.0%; actively managed books -0.8%; index-like books -6.0%.

Holder type	Share	Filers	Change	New	Exited
Registered adviser	61.4%	17	-6.1%	1	5
Bank	2.8%	9	+8.5%	1	0
Broker-dealer	0.3%	1	+116.2%	0	0
Non-US	0.0%	0	-100.0%	0	1
Holding company	17.6%	5	+3.5%	0	0
Adviser	0.0%	0	—	0	0
Insurer	0.0%	0	—	0	0
Unknown	18.0%	15	+5.6%	4	2

Style	Share	Filers	Change	New	Exited
Index-like	23.8%	8	-6.0%	0	0
Systematic-like	0.4%	2	+39.2%	1	1
Concentrated	32.9%	5	+1.0%	2	3
Diversified active	42.9%	32	-2.3%	3	4
Not measured	0.0%	0	—	0	0
Unknown	0.0%	0	—	0	0

Turnover	Share	Filers	Change	New	Exited
Low turnover	65.4%	31	-0.2%	2	5
Medium turnover	18.1%	5	-14.1%	1	1
High turnover	1.4%	5	+143.7%	3	2
Unknown	15.2%	6	+1.5%	0	0
Not measured	0.0%	0	—	0	0

Holding horizon	Share	Filers	Change	New	Exited
Short horizon	15.8%	6	+5.2%	1	0
Medium horizon	17.4%	5	-5.2%	0	0
Long horizon	66.6%	35	-2.9%	5	8
Unknown	0.2%	1	+127.5%	0	0
Not measured	0.0%	0	—	0	0

13F book size	Share	Filers	Change	New	Exited
Under $1B	53.6%	8	-5.6%	0	1
$1B to $10B	1.2%	7	+122.7%	3	1
$10B to $100B	6.3%	10	-3.3%	0	2
$100B or more	38.9%	22	+1.7%	3	4
Not measured	0.0%	0	—	0	0

Client base	Share	Filers	Change	New	Exited
Individuals and high net worth	37.5%	11	-1.1%	1	4
Pooled investment vehicles	8.2%	3	-27.7%	0	1
Registered funds and BDCs	15.6%	2	-2.7%	0	0
Corporations	0.1%	1	0.0%	0	0
Diversified	0.0%	0	—	0	0
Pension and profit sharing plans	0.0%	0	—	0	0
Unknown	38.6%	30	+5.3%	5	3

Private funds	Share	Filers	Change	New	Exited
Hedge funds	8.2%	3	-27.7%	0	1
Private equity funds	3.6%	2	+0.6%	0	0
Other private funds	0.3%	3	-41.9%	1	1
Private funds, type not stated	0.2%	1	0.0%	0	0
No private funds	49.1%	8	-1.4%	0	2
Real estate funds	0.0%	0	-100.0%	0	1
Unknown	38.6%	30	+5.3%	5	3

Location	Share	Filers	Change	New	Exited
United States	98.8%	44	-2.3%	5	8
Outside the US	1.2%	3	+23.1%	1	0

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 1 holder with no observed 2026-03-31 13F.

Conviction and Crowding

50 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders

0.000% of filers hold it in their top 10

Mar 31, 2026: 0

Holders above 5%

median weight 0.000%

Mar 31, 2026: 0

Crowding

3.50%

of shares outstanding, 12th percentile

Mar 31, 2026: 4.15%

Private-fund advisers

3.15%

of shares outstanding

Institutional ownership

25.7%

27.5% of the estimated free float

Top 10 holders

89.0%

of 13F shares, Herfindahl 0.152

Active holders

-0.8%

like-for-like share change of active filers

5% stakes on record

0 13D, 3 13G (1 institutional, 1 passive, 1 exempt)

How long holders have held it value-weighted 19.4 quarters

Under 1 year 20.0% 1 to 3 years 6.36% 3 years or more 73.6% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost

$2.70

estimated per share

Mar 31, 2026: $2.89

Quarter-end price

$0.37

implied by 13F values

Estimated gain or loss

-86.1%

price against the estimated cost

Estimated at a loss

100.0%

of costed 13F value

Estimated cost covers 29.0% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies CTSO's active holders also own, quarter ended Sep 30, 2025

#	Company	Shared holders	Similarity
1	BAC Bank Of America Corp /De/	3	0.028
2	AMZN Amazon Com Inc	3	0.020
3	AAPL Apple Inc.	3	0.020
4	GOOGL Alphabet Inc.	3	0.020

Shareholder Targets

13F filers that own its peers but not CTSO, quarter ended Sep 30, 2025

Found through its holder-overlap peers: BAC, AMZN, AAPL, GOOGL. 6,293 filers in all.

#	Filer	In peers	Of book	Largest peers
1	FMR LLC Holding company, Diversified active	$242,958,436,619 4 held	13.0%	GOOGL, AAPL, AMZN
2	PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser, Diversified active	$130,047,290,987 4 held	14.2%	AAPL, GOOGL, AMZN
3	Berkshire Hathaway Inc Insurer, Concentrated	$96,496,945,134 4 held	36.3%	AAPL, BAC, GOOGL
4	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser, Index-like	$62,201,464,849 4 held	13.5%	AAPL, GOOGL, AMZN
5	Bank of New York Mellon Corp Bank, Index-like	$60,278,922,941 4 held	11.5%	AAPL, GOOGL, AMZN
6	Legal & General Group Plc Unknown, Index-like	$60,222,569,271 4 held	13.5%	AAPL, GOOGL, AMZN
7	CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser, Diversified active	$58,912,481,598 4 held	9.59%	AAPL, GOOGL, AMZN
8	Capital International Investors Adviser, Diversified active	$58,281,369,494 3 held	9.46%	GOOGL, AAPL, AMZN
9	WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active	$58,253,491,143 4 held	10.4%	AAPL, GOOGL, AMZN
10	Capital Research Global Investors Adviser, Diversified active	$51,460,507,127 4 held	9.67%	AMZN, GOOGL, AAPL

Fund Ownership of CTSO by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 3.98% of shares outstanding.

Fund type	Of shares outstanding	Change	Shares	Funds
Index funds	1.04%	+0.14 pp	32,525	6
Index ETFs	2.94%	-0.18 pp	92,441	2
Active ETFs	0.03%	0.00 pp	1,088	1
Active funds	1.03%	-0.03 pp	32,338	2
Unclassified	0.01%	+0.01 pp	441	2
All registered funds	5.05%	-0.06 pp	158,833	13

How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 16 Bank 9 Broker-dealer 1 Non-US 2 Holding company 5 Unknown 15

Showing 48 of 48

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

AVENIR CORP

$1,940,767

32.53%

5,189,218

NEUBERGER BERMAN GROUP LLC

$736,289

12.34%

1,968,691

VANGUARD CAPITAL MANAGEMENT LLC

$715,859

12.00%

1,914,063

CM Management, LLC

$552,211

9.26%

1,476,500

Skylands Capital, LLC

$453,063

7.59%

1,211,400

BlackRock, Inc.

$234,576

3.93%

627,211

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BlackRock Institutional Trust Company, N.A.	627,211	$234,576	100.0%	Sole

GEODE CAPITAL MANAGEMENT, LLC

$225,169

3.77%

602,059

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	113,637	$42,500	18.9%	Defined
Held directly	488,422	$182,669	81.1%	Defined

Sargent Investment Group, LLC

$207,853

3.48%

555,757

Pathstone Holdings, LLC

$186,966

3.13%

499,910

VANGUARD FIDUCIARY TRUST CO

$118,246

1.98%

316,167

CIBC Bancorp USA Inc.

$64,570

1.08%

172,649

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
CIBC Private Wealth Advisors, Inc.	172,649	$64,570	100.0%	Defined

STATE STREET CORP

$59,575

1.00%

159,293

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	159,293	$59,575	100.0%	Defined

OSAIC HOLDINGS, INC.

$50,429

0.85%

134,839

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	109,559	$40,975	81.3%	Defined
OSAIC INSTITUTIONS, INC.	25,280	$9,454	18.7%	Defined

UBS Group AG

$49,000

0.82%

131,019

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	128,546	$48,076	98.1%	Defined
UBS Securities LLC	2,473	$924	1.9%	Defined

NORTHERN TRUST CORP

$41,760

0.70%

111,660

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	111,660	$41,760	100.0%	Defined

RAYMOND JAMES FINANCIAL INC

$40,245

0.67%

107,611

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RAYMOND JAMES & ASSOCIATES	52,293	$19,557	48.6%	Defined
Raymond James Financial Services Advisors, Inc.	55,318	$20,688	51.4%	Defined

RENAISSANCE TECHNOLOGIES LLC

$37,407

0.63%

100,020

MORGAN STANLEY

$34,159

0.57%

91,338

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	62	$23	0.1%	Defined
MORGAN STANLEY SMITH BARNEY LLC	90,989	$34,029	99.6%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	287	$107	0.3%	Defined

Virtu Financial LLC

$26,743

0.45%

71,508

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	71,508	$26,743	100.0%	Defined

XTX Topco Ltd

$20,314

0.34%

54,316

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	54,316	$20,314	100.0%	Defined

JANE STREET GROUP, LLC

$19,524

0.33%

52,205

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	29,606	$11,072	56.7%	Defined
Jane Street Global Trading, LLC	22,599	$8,452	43.3%	Defined

LPL Financial LLC

$18,744

0.31%

50,119

STIFEL FINANCIAL CORP

$17,952

0.30%

48,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STIFEL NICOLAUS & CO INC \MO\	48,000	$17,952	100.0%	Defined

BANK OF AMERICA CORP /DE/

$14,468

0.24%

38,686

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	38,686	$14,468	100.0%	Defined

HRT FINANCIAL LP

$12,014

0.20%

32,125

Kestra Advisory Services, LLC

$10,546

0.18%

28,200

EP Wealth Advisors, LLC

$10,472

0.18%

28,000

RITHOLTZ WEALTH MANAGEMENT

$10,263

0.17%

27,443

SFMG, LLC

$7,480

0.13%

20,000

Creative Planning

$7,089

0.12%

18,956

GOLDMAN SACHS GROUP INC

$5,736

0.10%

15,338

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	15,338	$5,736	100.0%	Defined

Merit Financial Group, LLC

$5,721

0.10%

15,297

FIRST NATIONAL BANK OF OMAHA

$5,694

0.10%

15,225

CITADEL ADVISORS LLC

$5,385

0.09%

14,400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	14,400	$5,385	100.0%	Defined

Vanguard Global Advisers, LLC

$5,185

0.09%

13,865

NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO

$4,179

0.07%

11,176

Tower Research Capital LLC (TRC)

$3,823

0.06%

10,223

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	10,223	$3,823	100.0%	Defined

MARATHON CAPITAL MANAGEMENT

$3,740

0.06%

10,000

FIFTH THIRD BANCORP

$1,155

0.02%

3,090

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fifth Third Bank, National Association	3,090	$1,155	100.0%	Defined

Global Retirement Partners, LLC

$881

0.01%

2,358

Rockefeller Capital Management L.P.

$617

0.01%

1,652

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
ROCKEFELLER FINANCIAL LLC	1,652	$617	100.0%	Defined

JPMORGAN CHASE & CO

$139

0.00%

372

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities plc	372	$139	100.0%	Defined

BARCLAYS PLC

$107

0.00%

287

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS CAPITAL INC.	287	$107	100.0%	Defined

WELLS FARGO & COMPANY/MN

$93

0.00%

250

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO CLEARING SERVICES, LLC	250	$93	100.0%	Defined

Farther Finance Advisors, LLC

$35

0.00%

PNC FINANCIAL SERVICES GROUP, INC.

$11

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PNC Bank, National Association	31	$11	100.0%	Defined

BNP PARIBAS ARBITRAGE, SA

0.00%

SBI Securities Co., Ltd.

0.00%

Key facts CIK 1175151 CUSIP 23283X305 13F (30d) 2 filings 2 filers Visit website Investor relations