As of September 09, 2026, the three largest insider holders of CTSO are Phillip P. Chan (Chief Executive Officer, 1.74Mn shares), Phillip P. Chan (Chief Executive Officer, 1.48Mn shares), Vincent Capponi (President And Coo, 766.27K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Phillip P. Chan | Chief Executive Officer | 1,744,432 | 0 | 1,744,432 | 36.6% | 15 Jun, 2026 |
| 2 | Vincent Capponi | President And Coo | 766,268 | 0 | 766,268 | 16.1% | 08 Aug, 2025 |
| 3 | Peter J Mariani | Chief Financial Officer | 638,113 | 0 | 638,113 | 13.4% | 16 Jun, 2026 |
| 4 | Kathleen P. Bloch | Chief Financial Officer | 532,941 | 0 | 532,941 | 11.2% | 04 Apr, 2024 |
| 5 | Efthymios Deliargyris | Chief Medical Officer | 473,025 | 0 | 473,025 | 9.9% | 08 Aug, 2025 |
| 6 | Michael G. Bator | Director | 151,273 | 0 | 151,273 | 3.2% | 04 Mar, 2025 |
| 7 | Alan D. Sobel | Director | 145,757 | 0 | 145,757 | 3.1% | 26 Feb, 2025 |
| 8 | Al Kraus | Director | 142,046 | 0 | 142,046 | 3.0% | 08 Feb, 2023 |
| 9 | Edward Raymond Jones | Director | 88,834 | 0 | 88,834 | 1.9% | 15 Dec, 2023 |
| 10 | Jiny Kim | Director | 77,819 | 0 | 77,819 | 1.6% | 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 |
|---|---|---|---|---|---|---|---|---|
| 15 Jun, 2026 | Peter J Mariani | Chief Financial Officer | Acquired P | 100,000 | $0.44 | $44.00K | 638,113 | Direct |
| 12 Jun, 2026 | Phillip P. Chan | Chief Executive Officer | Acquired P | 251,136 | $0.40 | $100.45K | 1,734,099 | Direct |
| 15 Jun, 2026 | Phillip P. Chan | Chief Executive Officer | Acquired P | 10,333 | $0.43 | $4.44K | 1,744,432 | Direct |
| 18 Nov, 2025 | Phillip P. Chan | Chief Executive Officer | Acquired A | 100,000 | $0.64 | $64.00K | 1,482,963 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 71,500 | $0.00 | $0 | 538,113 | Direct |
| 08 Aug, 2025 | Efthymios Deliargyris | Chief Medical Officer | Acquired A | 70,000 | $0.00 | $0 | 473,025 | Direct |
| 08 Aug, 2025 | Phillip P. Chan | Chief Executive Officer | Acquired A | 105,600 | $0.00 | $0 | 1,382,963 | Direct |
| 08 Aug, 2025 | Efthymios Deliargyris | Chief Medical Officer | Acquired A | 70,000 | $0.00 | $0 | 473,025 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 71,500 | $0.00 | $0 | 538,113 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 71,500 | $0.00 | $0 | 538,113 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 71,500 | $0.00 | $0 | 538,113 | Direct |
| 08 Aug, 2025 | Vincent Capponi | President And Coo | Acquired A | 89,100 | $0.00 | $0 | 766,268 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 90,000 | $0.00 | $0 | 90,000 | Direct |
| 08 Aug, 2025 | Efthymios Deliargyris | Chief Medical Officer | Acquired A | 95,000 | $0.00 | $0 | 95,000 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 90,000 | $0.00 | $0 | 90,000 | Direct |
| 08 Aug, 2025 | Jiny Kim | Director | Acquired A | 22,000 | $0.00 | $0 | 22,000 | Direct |
| 08 Aug, 2025 | Jiny Kim | Director | Acquired A | 22,000 | $0.00 | $0 | 22,000 | Direct |
| 08 Aug, 2025 | Peter J Mariani | Chief Financial Officer | Acquired A | 90,000 | $0.00 | $0 | 90,000 | Direct |
| 08 Aug, 2025 | Vincent Capponi | President And Coo | Acquired A | 111,100 | $0.00 | $0 | 111,100 | Direct |
| 08 Aug, 2025 | Jiny Kim | Director | Acquired A | 22,000 | $0.00 | $0 | 22,000 | Direct |