As of April 22, 2026, the three largest insider holders of MXCT are Partners Master Fund, L.P. Casdin (TenPercentOwner, 10.00Mn shares), Partners Master Fund, L.P. Casdin (TenPercentOwner, 10.00Mn shares), Partners Master Fund, L.P. Casdin (TenPercentOwner, 10.00Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Partners Master Fund, L.P. Casdin | - | 10,000,000 | 0 | 05 Oct, 2022 |
| Partners Master Fund, L.P. Casdin | - | 10,000,000 | 0 | 05 Oct, 2022 |
| Partners Master Fund, L.P. Casdin | - | 10,000,000 | 0 | 05 Oct, 2022 |
| Maher Masoud | President And Ceo | 475,000 | 0 | 31 Mar, 2026 |
| Maher Masoud | President And Ceo | 475,000 | 0 | 31 Mar, 2026 |
| Stanley C Erck | - | 398,328 | 0 | 13 Aug, 2025 |
| Art Mandell | - | 395,851 | 0 | 13 Jun, 2024 |
| Art Mandell | - | 395,851 | 0 | 13 Jun, 2024 |
| Douglas Doerfler | President And Ceo | 333,197 | 0 | 06 Dec, 2023 |
| Richard Douglas | - | 230,577 | 0 | 13 Aug, 2025 |
| John Joseph Johnston | - | 171,160 | 0 | 23 Jun, 2025 |
| Douglas J Swirsky | Chief Financial Officer | 151,669 | 0 | 19 Mar, 2026 |
| Douglas J Swirsky | Chief Financial Officer | 151,669 | 0 | 19 Mar, 2026 |
| William W Brooke | - | 150,879 | 0 | 13 Aug, 2025 |
| Ron Holtz | Svp And Cao | 125,251 | 0 | 16 Nov, 2021 |
| Cynthia Collins | - | 80,889 | 0 | 23 Jun, 2025 |
| David I. Sandoval | General Counsel | 64,219 | 0 | 20 Mar, 2025 |
| David I. Sandoval | General Counsel | 64,219 | 0 | 20 Mar, 2025 |
| Ali Soleymannezhad | Chief Commercial Officer | 59,439 | 0 | 20 Mar, 2025 |
| Ali Soleymannezhad | Chief Commercial Officer | 59,439 | 0 | 20 Mar, 2025 |
| Yasir B. Al-Wakeel | - | 50,577 | 0 | 23 Jun, 2025 |
| Patrick J Balthrop | - | 50,577 | 0 | 23 Jun, 2025 |
| Rekha Hemrajani | - | 39,893 | 0 | 27 Aug, 2025 |
| Thomas M. Ross | Evp, Global Sales | 25,000 | 0 | 05 Aug, 2024 |
| Thomas M. Ross | Evp, Global Sales | 25,000 | 0 | 05 Aug, 2024 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 30 Mar, 2026 | Parmeet Ahuja | Employee Stock Option (right to buy) | A | 375,000 | $0.00 | 375,000 | D | A |
| 27 Mar, 2026 | Maher Masoud | Common Stock | A | 300,000 | $0.00 | 475,000 | D | A |
| 27 Mar, 2026 | Maher Masoud | Employee Stock Option (right to buy) | A | 600,000 | $0.00 | 600,000 | D | A |
| 17 Mar, 2026 | Douglas J Swirsky | Common Stock | D | 10,142 | $0.82 | 151,669 | D | S |
| 25 Jun, 2025 | Rekha Hemrajani | Common Stock | D | 10,684 | $2.09 | 39,893 | D | S |
| 13 Aug, 2025 | Douglas J Swirsky | Common Stock | A | 50,000 | $1.29 | 161,811 | D | P |
| 13 Aug, 2025 | William W Brooke | Common Stock | A | 50,000 | $1.29 | 150,879 | D | P |
| 13 Aug, 2025 | Maher Masoud | Common Stock | A | 75,000 | $1.37 | 175,000 | D | P |
| 13 Aug, 2025 | Stanley C Erck | Common Stock | A | 100,000 | $1.37 | 398,328 | D | P |
| 13 Aug, 2025 | Richard Douglas | Common Stock | A | 80,000 | $1.39 | 230,577 | D | P |
| 18 Jun, 2025 | Stanley C Erck | Common Stock | A | 29,210 | $0.00 | 298,328 | D | A |
| 18 Jun, 2025 | Richard Douglas | Common Stock | A | 29,210 | $0.00 | 150,577 | D | A |
| 18 Jun, 2025 | Patrick J Balthrop | Common Stock | A | 29,210 | $0.00 | 50,577 | D | A |
| 18 Jun, 2025 | Yasir B. Al-Wakeel | Common Stock | A | 29,210 | $0.00 | 50,577 | D | A |
| 18 Jun, 2025 | Rekha Hemrajani | Common Stock | A | 29,210 | $0.00 | 50,577 | D | A |
| 18 Jun, 2025 | Cynthia Collins | Common Stock | A | 29,210 | $0.00 | 80,889 | D | A |
| 18 Jun, 2025 | John Joseph Johnston | Common Stock | A | 29,210 | $0.00 | 171,160 | D | A |
| 18 Jun, 2025 | William W Brooke | Common Stock | A | 29,210 | $0.00 | 100,879 | D | A |
| 18 Jun, 2025 | John Joseph Johnston | Stock Option (right to buy) | A | 50,790 | $0.00 | 50,790 | D | A |
| 18 Jun, 2025 | Cynthia Collins | Stock Option (right to buy) | A | 50,790 | $0.00 | 50,790 | D | A |