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CTSO · Cytosorbents Corp · Shareholders & Ownership

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$4.80 -0.52 (-9.77%)
Market Cap
$16.72M
Shares
3.14M
Volume · Oct 20 79.28K Avg daily vol (30 sessions) 44.8K

Every disclosed holder of CTSO in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns CTSO

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions
Holder group Shares % Out
Institutional (13F) 796,918 25.36%
Insiders (Forms 3, 4, 5) 222,724 7.09%
13D/G-only blocks 492,451 15.67%
Remaining 1,630,044 51.88%
Registered funds (N-PORT, not summed) 158,820 5.05%

Shares outstanding: 3,142,137, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of CTSO

# Holder Shares
1
AVENIR CORP
13F CIK 1033475 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
259,461
2
Thomas A. Satterfield, Jr.
13G CIK 1132317 · Unknown · Jan 13, 2025
Rule 13d-1(c), passive investor
199,943
3
Avenue Venture Opportunities Fund, L.P.
13G CIK 1792691 · Unknown · Jun 26, 2024
Rule 13d-1(d), exempt investor
187,764
4
Granahan Investment Management, LLC
13G CIK 1026710 · Registered investment adviser · Sep 30, 2024
Rule 13d-1(b), qualified institution
104,744
5
Chan Phillip P.
Insider CIK 1442786 · Sep 15, 2026
Director, Chief Executive Officer, issuer-wide
100,996
6
NEUBERGER BERMAN GROUP LLC
13F CIK 1465109 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
98,435
6.1
Neuberger Intrinsic Value Fund
Fund S000028676 · Registered fund · May 31, 2026
NEUBERGER BERMAN EQUITY FUNDS, not summed
32,326
7
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
95,703
8
CM Management, LLC
13F CIK 1841857 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
73,825
9
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
63,718
10
Skylands Capital, LLC
13F CIK 1299910 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
60,570
11
Capponi Vincent
Insider CIK 1368151 · Sep 14, 2026
President and COO, issuer-wide
40,387
12
MARIANI PETER J
Insider CIK 1222357 · Jun 15, 2026
EVP & Chief Financial Officer, issuer-wide
31,906
13
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
31,361
14
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
30,103
15
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
28,723
16
Sargent Investment Group, LLC
13F CIK 1766157 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
27,788
17
Pathstone Holdings, LLC
13F CIK 2011612 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
24,996
18
Deliargyris Efthymios
Insider CIK 1751617 · Aug 8, 2025
Chief Medical Officer, issuer-wide
23,651
19
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
19,013
20
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
15,808
21
Sobel Alan D.
Insider CIK 1639386 · Sep 15, 2026
Director, issuer-wide
9,887
22
CIBC Bancorp USA Inc.
13F CIK 1711924 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
8,632
23
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
7,965
24
BATOR MICHAEL G.
Insider CIK 1647591 · Aug 8, 2025
Director, issuer-wide
7,564
25
OSAIC HOLDINGS, INC.
13F CIK 1677044 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
6,742
26
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
6,551
27
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
5,583
28
RAYMOND JAMES FINANCIAL INC
13F CIK 720005 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
5,381
29
RENAISSANCE TECHNOLOGIES LLC
13F CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
5,001
30
Fidelity Total Market Index Fund
Fund S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
4,716
31
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
4,567
32
Jones Edward Raymond
Insider CIK 1396246 · Aug 8, 2025
Director, issuer-wide
4,442
33
Fidelity Series Total Market Index Fund
Fund S000065248 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
3,929
34
Kim Jiny
Insider CIK 1920967 · Aug 8, 2025
Director, issuer-wide
3,891
35
Virtu Financial LLC
13F CIK 1533964 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
3,575
36
XTX Topco Ltd
13F CIK 1828301 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
2,716
37
JANE STREET GROUP, LLC
13F CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
2,610
38
LPL Financial LLC
13F CIK 1403438 · Broker-dealer · Jun 30, 2026
carried, not yet filed for the newest quarter
2,506
39
STIFEL FINANCIAL CORP
13F CIK 720672 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
2,400
40
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,934
41
VANGUARD BALANCED INDEX FUND
Fund S000002560 · Registered fund · Jun 30, 2026
VANGUARD VALLEY FORGE FUNDS, not summed
1,782
42
HRT FINANCIAL LP
13F CIK 1475597 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,606
43
Fidelity Nasdaq Composite Index Fund
Fund S000055366 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
1,605
44
VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND
Fund S000002855 · Registered fund · Jun 30, 2026
VANGUARD INSTITUTIONAL INDEX FUNDS, not summed
1,480
45
Kestra Advisory Services, LLC
13F CIK 1830819 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,410
46
EP Wealth Advisors, LLC
13F CIK 1540569 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,400
47
RITHOLTZ WEALTH MANAGEMENT
13F CIK 1698218 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,372
48
Morgan Stanley Pathway Small-Mid Cap Equity ETF
Fund S000088120 · Registered fund · May 31, 2026
MORGAN STANLEY PATHWAY FUNDS, not summed
1,088
49
SFMG, LLC
13F CIK 1512026 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,000
50
Creative Planning
13F CIK 1540235 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
948

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 68 holders

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