As of April 22, 2026, the three largest insider holders of CTSO 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).
| 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 |
| Kathleen P. Bloch | Interim Cfo | 0 | 43,700 | 12 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.
| 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 | Vincent Capponi | Common Stock | A | 89,100 | $0.00 | 766,268 | D | A |
| 08 Aug, 2025 | Efthymios Deliargyris | Common Stock | A | 70,000 | $0.00 | 473,025 | 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 | Peter J Mariani | Stock Option (Right to Buy) | A | 90,000 | $0.00 | 90,000 | 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 | Vincent Capponi | Stock Option (Right to Buy) | A | 111,100 | $0.00 | 111,100 | 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 | Phillip P. Chan | Stock Option (Right to Buy) | A | 136,400 | $0.00 | 136,400 | D | A |
| 08 Aug, 2025 | Jiny Kim | Stock Option (Right to Buy) | A | 22,000 | $0.00 | 22,000 | D | A |
| 08 Aug, 2025 | Efthymios Deliargyris | Stock Option (Right to Buy) | A | 95,000 | $0.00 | 95,000 | 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 | Phillip P. Chan | Common Stock | A | 34,168 | $1.13 | 1,277,363 | 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 | Vincent Capponi | Series A Right Warrants (right to buy) | D | 12,000 | $1.13 | 0 | D | O |