As of September 29, 2026, Cytosorbents's top three insider holders are Phillip P. Chan (Chief Executive Officer, 101.00K shares), Vincent Capponi (President And Coo, 40.39K shares), Alan D. Sobel (Director, 9.89K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Phillip P. Chan | Chief Executive Officer | 100,996 | 0 | 100,996 | 66.7% | 16 Sep, 2026 |
| 2 | Vincent Capponi | President And Coo | 40,387 | 0 | 40,387 | 26.7% | 16 Sep, 2026 |
| 3 | Alan D. Sobel | Director | 9,887 | 0 | 9,887 | 6.5% | 16 Sep, 2026 |
| 4 | Peter J Mariani | Chief Financial Officer | 13 | 0 | 13 | 0.0% | 16 Jun, 2026 |
| 5 | Kathleen P. Bloch | Chief Financial Officer | 11 | 0 | 11 | 0.0% | 04 Apr, 2024 |
| 6 | Efthymios Deliargyris | Chief Medical Officer | 9 | 0 | 9 | 0.0% | 08 Aug, 2025 |
| 7 | Michael G. Bator | Director | 3 | 0 | 3 | 0.0% | 04 Mar, 2025 |
| 8 | Al Kraus | Director | 3 | 0 | 3 | 0.0% | 08 Feb, 2023 |
| 9 | Edward Raymond Jones | Director | 2 | 0 | 2 | 0.0% | 15 Dec, 2023 |
| 10 | Jiny Kim | Director | 2 | 0 | 2 | 0.0% | 15 Dec, 2023 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 04 Sep, 2026 | Phillip P. Chan | Chief Executive Officer | Acquired P | 200,000 | $17,500.00 | $3.50Bn | 39 | Direct |
| 15 Jun, 2026 | Peter J Mariani | Chief Financial Officer | Acquired P | 100,000 | $22,000.00 | $2.20Bn | 13 | Direct |
| 12 Jun, 2026 | Phillip P. Chan | Chief Executive Officer | Acquired P | 251,136 | $20,000.00 | $5.02Bn | 35 | Direct |
| 15 Jun, 2026 | Phillip P. Chan | Chief Executive Officer | Acquired P | 10,333 | $21,500.00 | $222.16Mn | 35 | Direct |
| 18 Nov, 2025 | Phillip P. Chan | Chief Executive Officer | Acquired A | 100,000 | $32,000.00 | $3.20Bn | 30 | Direct |
| 08 Aug, 2025 | Vincent Capponi | President And Coo | Acquired A | 89,100 | $0.00 | $0 | 15 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 71,500 | $0.00 | $0 | 11 | Direct |
| 08 Aug, 2025 | Efthymios Deliargyris | Chief Medical Officer | Acquired A | 70,000 | $0.00 | $0 | 9 | Direct |
| 08 Aug, 2025 | Phillip P. Chan | Chief Executive Officer | Acquired A | 105,600 | $0.00 | $0 | 28 | Direct |
| 08 Aug, 2025 | Vincent Capponi | President And Coo | Acquired A | 111,100 | $0.00 | $0 | 2 | Direct |
| 08 Aug, 2025 | Jiny Kim | Director | Acquired A | 22,000 | $0.00 | $0 | 0 | Direct |
| 08 Aug, 2025 | Efthymios Deliargyris | Chief Medical Officer | Acquired A | 95,000 | $0.00 | $0 | 2 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 90,000 | $0.00 | $0 | 2 | Direct |
| 08 Aug, 2025 | Phillip P. Chan | Chief Executive Officer | Acquired A | 136,400 | $0.00 | $0 | 3 | Direct |
| 08 Aug, 2025 | Edward Raymond Jones | Director | Acquired A | 22,000 | $0.00 | $0 | 0 | Direct |
| 08 Aug, 2025 | Michael G. Bator | Director | Acquired A | 44,000 | $0.00 | $0 | 1 | Direct |
| 08 Aug, 2025 | Alan D. Sobel | Director | Acquired A | 22,000 | $0.00 | $0 | 0 | Direct |
| 24 Feb, 2025 | Michael G. Bator | Director | Acquired O | 10,000 | $56,500.00 | $565.00Mn | 3 | Direct |
| 24 Feb, 2025 | Michael G. Bator | Director | Disposed O | 15,879 | $56,500.00 | $897.16Mn | 0 | Direct |
| 24 Feb, 2025 | Alan D. Sobel | Director | Acquired O | 21,950 | $56,500.00 | $1.24Bn | 3 | Direct |