Cytosorbents Corp (CTSO) Insider Ownership

Historic Insider Ownership Trends

CTSO's three largest insider shareholders as of March 23, 2026 are Phillip P. Chan (Chief Executive Officer, 1.48Mn shares), Vincent Capponi (President And Coo, 766.27K shares), Peter J Mariani (Chief Financial Officer, 538.11K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Phillip P. Chan Chief Executive Officer 1,482,963 0 20 Nov, 2025
Vincent Capponi President And Coo 766,268 0 08 Aug, 2025
Peter J Mariani Chief Financial Officer 538,113 0 08 Aug, 2025
Kathleen P. Bloch Chief Financial Officer 532,941 0 04 Apr, 2024
Efthymios Deliargyris Chief Medical Officer 473,025 0 08 Aug, 2025
Michael G. Bator 151,273 0 04 Mar, 2025
Alan D. Sobel 145,757 0 26 Feb, 2025
Al Kraus 142,046 0 08 Feb, 2023
Edward Raymond Jones 88,834 0 15 Dec, 2023
Jiny Kim 77,819 0 15 Dec, 2023
Kathleen P. Bloch Interim Cfo 0 47,000 30 May, 2023

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
18 Nov, 2025 Phillip P. Chan Common Stock A 100,000 $0.64 1,482,963 D A
08 Aug, 2025 Phillip P. Chan Common Stock A 105,600 $0.00 1,382,963 D A
08 Aug, 2025 Peter J Mariani Common Stock A 71,500 $0.00 538,113 D A
08 Aug, 2025 Efthymios Deliargyris Common Stock A 70,000 $0.00 473,025 D A
08 Aug, 2025 Vincent Capponi Common Stock A 89,100 $0.00 766,268 D A
08 Aug, 2025 Efthymios Deliargyris Stock Option (Right to Buy) A 95,000 $0.00 95,000 D A
08 Aug, 2025 Jiny Kim Stock Option (Right to Buy) A 22,000 $0.00 22,000 D A
08 Aug, 2025 Phillip P. Chan Stock Option (Right to Buy) A 136,400 $0.00 136,400 D A
08 Aug, 2025 Peter J Mariani Stock Option (Right to Buy) A 90,000 $0.00 90,000 D A
08 Aug, 2025 Edward Raymond Jones Stock Option (Right to Buy) A 22,000 $0.00 22,000 D A
08 Aug, 2025 Vincent Capponi Stock Option (Right to Buy) A 111,100 $0.00 111,100 D A
08 Aug, 2025 Michael G. Bator Stock Option (Right to Buy) A 44,000 $0.00 44,000 D A
08 Aug, 2025 Alan D. Sobel Stock Option (Right to Buy) A 22,000 $0.00 22,000 D A
24 Feb, 2025 Michael G. Bator Common Stock A 10,000 $1.13 151,273 D O
24 Feb, 2025 Michael G. Bator Series A Right Warrants (right to buy) D 15,879 $1.13 0 D O
24 Feb, 2025 Vincent Capponi Common Stock A 12,000 $1.13 677,168 D O
24 Feb, 2025 Alan D. Sobel Common Stock A 21,950 $1.13 145,757 D O
24 Feb, 2025 Peter J Mariani Common Stock A 32,625 $1.13 466,613 D O
24 Feb, 2025 Phillip P. Chan Common Stock A 34,168 $1.13 1,277,363 D O
24 Feb, 2025 Vincent Capponi Series A Right Warrants (right to buy) D 12,000 $1.13 0 D O