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CTSO

Cytosorbents Corp

Company with tickers: CTSO

CIK
1175151
CUSIP
23283X206
Shares Outstanding
62,794,748
13F Activity (30d)
41 filings 41 filers
Holders: 50
Total Value: $9,322,630
Total Shares: 16,471,131

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 50 13F filers · Δ vs Dec 31, 2025
Top Holder
31.7%
Jun 2023 → Mar 2026 · range 17.0% – 31.7%
+0.7 pts
Top 5
72.6%
Jun 2023 → Mar 2026 · range 64.5% – 76.7%
−0.9 pts
Top 10
90.0%
Jun 2023 → Mar 2026 · range 86.6% – 92.4%
+0.7 pts
HHI
1,496
Jun 2023 → Mar 2026 · range 1,014 – 1,572
Broadly held +10

Quarterly Activity

vs Dec 31, 2025
New
10
Increased
9
Decreased
12
Sold Out
11
Unchanged
19
Holder count: -1
Institutional value: -13.5%
Shares held: -2.3%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega GEODE CAPITAL MANAGEMENT, LLC +103,495 707,262
Mega NEUBERGER BERMAN GROUP LLC +57,367 1,683,007
Mega BlackRock, Inc. +12,441 782,992
Mega GOLDMAN SACHS GROUP INC +7,995 43,947
Mid XTX Topco Ltd +5,888 35,570

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Small Skylands Capital, LLC −147,017 1,707,498
Mega CITADEL ADVISORS LLC −138,480 10,799
Small Sargent Investment Group, LLC −62,100 549,900
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP −53,418 29,945
Mega MORGAN STANLEY −16,311 100,169

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 1,879,989 $1,064,073
Mega VANGUARD FIDUCIARY TRUST CO 313,856 $177,642
Large CIBC Bancorp USA Inc. 172,649 $97,719
Mid RITHOLTZ WEALTH MANAGEMENT 27,443 $15,532
Large HRT FINANCIAL LP 14,113 $7,987

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 2,204,294 $1,408,542
Large CIBC Private Wealth Group LLC 172,649 $110,322
Mid GSA CAPITAL PARTNERS LLP 148,374 $94,810
Mid Compound Planning, Inc. 27,443 $17,536
Mid Virtu Financial LLC 10,780 $6,888
Filter: New 10 Increased 9 Reduced 12 Sold out 11 Unchanged 19
Showing 50 of 50
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Small AVENIR CORP $2,952,129 31.67% 5,215,776
Mega VANGUARD CAPITAL MANAGEMENT LLC $1,064,073 11.41% 1,879,989
Small Skylands Capital, LLC $966,443 10.37% 1,707,498
Mega NEUBERGER BERMAN GROUP LLC $952,581 10.22% 1,683,007
Small CM Management, LLC $835,699 8.96% 1,476,500
Mega BlackRock, Inc. $443,173 4.75% 782,992
Mega GEODE CAPITAL MANAGEMENT, LLC $400,309 4.29% 707,262
Small Sargent Investment Group, LLC $311,243 3.34% 549,900
Large Pathstone Holdings, LLC $282,974 3.04% 499,955
Mega VANGUARD FIDUCIARY TRUST CO Bank $177,642 1.91% 313,856
Large CIBC Bancorp USA Inc. Bank $97,719 1.05% 172,649
Mega STATE STREET CORP $90,159 0.97% 159,293
Large OSAIC HOLDINGS, INC. $73,816 0.79% 130,419
Mega UBS Group AG $65,203 0.70% 115,200
Mega RAYMOND JAMES FINANCIAL INC $60,986 0.65% 107,751
Small NWF Advisory Services Inc. $58,942 0.63% 104,139
Large RENAISSANCE TECHNOLOGIES LLC $57,007 0.61% 100,720
Mega MORGAN STANLEY $56,694 0.61% 100,169
Mega NORTHERN TRUST CORP Bank $52,376 0.56% 92,540
Small Key Client Fiduciary Advisors, LLC $44,406 0.48% 78,457
Mid Waverly Advisors, LLC $31,444 0.34% 55,556
Large STIFEL FINANCIAL CORP $27,168 0.29% 48,000
Mega GOLDMAN SACHS GROUP INC $24,873 0.27% 43,947
Mega BANK OF AMERICA CORP /DE/ Bank $22,143 0.24% 39,123
Mid XTX Topco Ltd $20,132 0.22% 35,570
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $16,948 0.18% 29,945
Large Kestra Advisory Services, LLC $15,961 0.17% 28,200
Mid EP Wealth Advisors, LLC $15,848 0.17% 28,000
Mid RITHOLTZ WEALTH MANAGEMENT $15,532 0.17% 27,443
Mega LPL Financial LLC $13,122 0.14% 23,185
Large Creative Planning $12,052 0.13% 21,295
Small Seelaus Asset Management LLC $9,225 0.10% 16,300
Mid Merit Financial Group, LLC $8,658 0.09% 15,297
Mid FIRST NATIONAL BANK OF OMAHA Bank $8,617 0.09% 15,225
Large HRT FINANCIAL LP $7,987 0.09% 14,113
Mega Vanguard Global Advisers, LLC $7,847 0.08% 13,865
Small Texas Capital Bank Wealth Management Services Inc Bank $6,226 0.07% 11,000
Mega CITADEL ADVISORS LLC $6,112 0.07% 10,799
Small MARATHON CAPITAL MANAGEMENT $5,660 0.06% 10,000
Large FIFTH THIRD BANCORP Bank $1,744 0.02% 3,082
Large Rockefeller Capital Management L.P. $1,053 0.01% 1,861
Mega JPMORGAN CHASE & CO $210 0.00% 372
Micro Your Advocates Ltd., LLP $141 0.00% 250
Mega WELLS FARGO & COMPANY/MN $141 0.00% 250
Mid MAI Capital Management $131 0.00% 233
Large JONES FINANCIAL COMPANIES LLLP $52 0.00% 93
Mega PNC FINANCIAL SERVICES GROUP, INC. $17 0.00% 31
Mega BNP PARIBAS ARBITRAGE, SA $9 0.00% 17
Mid Farther Finance Advisors, LLC $3 0.00% 6
Mid SBI Securities Co., Ltd. Broker-Dealer $0 0.00% 1

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