CTSO
Cytosorbents (CTSO)
NASDAQ
$5.82-$0.19 (-3.14%)
Price as of Oct 23, 2026 4:56 AM EDT
  • $16.9M
    Market Cap
  • -64.31%
    1-Year Change
  • Medical Devices
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
AVENIR CORP
164.68%
5.2M
-26,558 (-0.51%)
Jun 30, 2026
VANGUARD GROUP INC
69.95%
2.2M
0 (0.00%)
Dec 31, 2025
NEUBERGER BERMAN GROUP LLC
62.48%
2.0M
+285,684 (+14.51%)
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
60.74%
1.9M
+34,074 (+1.78%)
Jun 30, 2026
N/A
59.66%
1.9M
+1.9M (+100.00%)
Mar 31, 2026
CM MANAGEMENT, LLC
46.86%
1.5M
0 (0.00%)
Jun 30, 2026
GRANAHAN INVESTMENT MANAGEMENT INC/MA
35.09%
1.1M
-48,954 (-4.43%)
Dec 31, 2021

Current Ownership Distribution

  • Institutions314.1M (80.52%)
  • Mutual Funds61.3M (15.72%)
  • Insiders14.7M (3.76%)
  • Other0 (0.00%)

Insider Transactions

  • 3.76% (14.7M)
    Current InsiderOwnership (%, shares)
  • 3
    Number of InsiderBuying (last 12 months)
  • $1.8M
    Amount of InsiderBuying (last 12 months)
  • 0
    Number of InsiderSelling (last 12 months)
  • $0.00
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Chan Phillip P.
Chief Executive Officer
Buy
Sep 15, 2026
$22,644.00
3,774
$6.00
100,996
Sobel Alan D.
Buy
Sep 15, 2026
$11,628.00
1,900
$6.12
9,287
Sobel Alan D.
Buy
Sep 15, 2026
$3,025.00
500
$6.05
9,787
Sobel Alan D.
Buy
Sep 15, 2026
$601.00
100
$6.01
9,887
Capponi Vincent
President and COO
Buy
Sep 14, 2026
$10,926.00
1,800
$6.07
40,114
Capponi Vincent
President and COO
Buy
Sep 14, 2026
$1,610.70
273
$5.90
40,387
Chan Phillip P.
Chief Executive Officer
Buy
Sep 04, 2026
$70,000.00
200,000
$0.35
1.9M
Chan Phillip P.
Chief Executive Officer
Award
Nov 18, 2025
$64,000.00
100,000
$0.64
1.5M
Kim Jiny
Award
Aug 08, 2025
$0.00
22,000
$0.00
22,000
Chan Phillip P.
Chief Executive Officer
Award
Aug 08, 2025
$0.00
136,400
$0.00
136,400
Deliargyris Efthymios
Chief Medical Officer
Award
Aug 08, 2025
$0.00
95,000
$0.00
95,000
Sobel Alan D.
Award
Aug 08, 2025
$0.00
22,000
$0.00
22,000
Jones Edward Raymond
Award
Aug 08, 2025
$0.00
22,000
$0.00
22,000
Capponi Vincent
President and COO
Award
Aug 08, 2025
$0.00
111,100
$0.00
111,100
Deliargyris Efthymios
Chief Medical Officer
Award
Aug 08, 2025
$0.00
70,000
$0.00
473,025
Chan Phillip P.
Chief Executive Officer
Award
Aug 08, 2025
$0.00
105,600
$0.00
1.4M
Capponi Vincent
President and COO
Award
Aug 08, 2025
$0.00
89,100
$0.00
766,268
Chan Phillip P.
Chief Executive Officer
Out Of The Money
Feb 24, 2025
$38,609.84
34,168
$1.13
0
Sobel Alan D.
Out Of The Money
Feb 24, 2025
$24,803.50
21,950
$1.13
0
Chan Phillip P.
Chief Executive Officer
Out Of The Money
Feb 24, 2025
$38,609.84
34,168
$1.13
1.3M
Capponi Vincent
President and COO
Out Of The Money
Feb 24, 2025
$13,560.00
12,000
$1.13
0
BATOR MICHAEL G.
Out Of The Money
Feb 24, 2025
$17,943.27
15,879
$1.13
0
Capponi Vincent
President and COO
Out Of The Money
Feb 24, 2025
$13,560.00
12,000
$1.13
677,168
Sobel Alan D.
Out Of The Money
Feb 24, 2025
$24,803.50
21,950
$1.13
145,757
MARIANI PETER J
Chief Financial Officer
Out Of The Money
Feb 24, 2025
$36,866.25
32,625
$1.13
0
BATOR MICHAEL G.
Out Of The Money
Feb 24, 2025
$11,300.00
10,000
$1.13
151,273
MARIANI PETER J
Chief Financial Officer
Out Of The Money
Feb 24, 2025
$36,866.25
32,625
$1.13
466,613
Capponi Vincent
President and COO
In The Money
Jan 17, 2025
$0.00
31,760
$0.00
0
MARIANI PETER J
Chief Financial Officer
In The Money
Jan 17, 2025
$0.00
32,625
$0.00
0
Capponi Vincent
President and COO
Other
Jan 17, 2025
$0.00
31,760
$0.00
31,760