6 insiders reported 17 Form 4 transactions for Cytosorbents Corp (CTSO) over the past 18 months (most recent 2026-06-16). Recent activity: MARIANI PETER J (Chief Financial Officer) Buy 100,000 shares, Chan Phillip P. (Chief Executive Officer) Buy 100,000 shares, MARIANI PETER J (Chief Financial Officer) Buy 71,500 shares, Capponi Vincent (President and COO) Buy 89,100 shares, Chan Phillip P. (Chief Executive Officer) Buy 105,600 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-16 | MARIANI PETER J | Chief Financial Officer | Buy | 100,000 | $44,000 |
| 2025-11-20 | Chan Phillip P. | Chief Executive Officer | Buy | 100,000 | $64,000 |
| 2025-08-08 | MARIANI PETER J | Chief Financial Officer | Buy | 71,500 | $0 |
| 2025-08-08 | Capponi Vincent | President and COO | Buy | 89,100 | $0 |
| 2025-08-08 | Chan Phillip P. | Chief Executive Officer | Buy | 105,600 | $0 |
| 2025-08-08 | Deliargyris Efthymios | Chief Medical Officer | Buy | 70,000 | $0 |
| 2025-03-04 | BATOR MICHAEL G. | Director | Buy | 10,000 | $11,300 |
| 2025-02-26 | MARIANI PETER J | Chief Financial Officer | Buy | 32,625 | $36,866 |
| 2025-02-26 | Capponi Vincent | President and COO | Buy | 12,000 | $13,560 |
| 2025-02-26 | Chan Phillip P. | Chief Executive Officer | Buy | 34,168 | $38,610 |
| 2025-02-26 | Sobel Alan D. | Director | Buy | 21,950 | $24,803 |
| 2025-01-22 | Deliargyris Efthymios | Chief Medical Officer | Buy | 16,233 | $16,233 |
| 2025-01-22 | Chan Phillip P. | Chief Executive Officer | Buy | 90,832 | $90,832 |
| 2025-01-22 | Sobel Alan D. | Director | Buy | 21,950 | $21,950 |
| 2025-01-22 | MARIANI PETER J | Chief Financial Officer | Buy | 32,625 | $32,625 |
| 2025-01-22 | Capponi Vincent | President and COO | Buy | 31,760 | $31,760 |
| 2025-01-22 | BATOR MICHAEL G. | Director | Buy | 15,879 | $15,879 |
Source: SEC Form 4 filings · as of 2026-06-16