MRKR's three largest insider shareholders as of June 06, 2026 are Juan Vera (Chief Scientific Officer Coo, 2.67Mn shares), Enterprise Associates 16, L.P. New (TenPercentOwner, 1.63Mn shares), Peter L. Hoang (President And Ceo, 483.29K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Steve Elms | - | 0 | 325,370 | 26 Dec, 2024 |
| Peter L. Hoang | President And Ceo | 483,286 | 0 | 28 Mar, 2022 |
| Enterprise Associates 16, L.P. New | - | 1,625,678 | 0 | 23 Dec, 2024 |
| Juan Vera | Chief Scientific Officer Coo | 2,671,845 | 0 | 28 Mar, 2022 |
| Anthony H. Kim | Chief Financial Officer | 114,436 | 0 | 28 Mar, 2022 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 17 Nov, 2025 | Norman David Eansor | Stock Option (Right to Buy) | A | 84,411 | $0.00 | 84,411 | D | A |
| 17 Nov, 2025 | Katharine Knobil | Stock Option (Right to Buy) | A | 84,411 | $0.00 | 84,411 | D | A |
| 17 Nov, 2025 | Steve Elms | Stock Option (right to buy) | A | 84,411 | $0.00 | 84,411 | D | A |
| 17 Nov, 2025 | Norman David Eansor | Stock Option (Right to Buy) | A | 137,330 | $0.00 | 137,330 | D | A |
| 17 Nov, 2025 | Katharine Knobil | Stock Option (Right to Buy) | A | 137,330 | $0.00 | 137,330 | D | A |
| 17 Nov, 2025 | Steve Elms | Stock Option (right to buy) | A | 137,330 | $0.00 | 137,330 | D | A |
| 31 Oct, 2025 | Juan Vera | Employee Stock Option (right to buy) | A | 250,000 | $0.00 | 250,000 | D | A |
| 31 Oct, 2025 | Juan Vera | Employee Stock Option (right to buy) | A | 250,000 | $0.00 | 250,000 | D | A |
| 31 Oct, 2025 | Kathryn Penkus Corzo | Stock Option (Right to Buy) | A | 147,611 | $0.00 | 147,611 | D | A |
| 12 Feb, 2025 | Juan Vera | Employee Stock Option (right to buy) | A | 50,000 | $0.00 | 50,000 | D | A |
| 12 Feb, 2025 | Juan Vera | Employee Stock Option (right to buy) | A | 50,000 | $0.00 | 50,000 | D | A |
| 12 Feb, 2025 | Norman David Eansor | Stock Option (right to buy) | A | 30,000 | $0.00 | 30,000 | D | A |
| 12 Feb, 2025 | Steve Elms | Stock Option (right to buy) | A | 30,000 | $0.00 | 30,000 | D | A |
| 12 Feb, 2025 | Katharine Knobil | Stock Option (right to buy) | A | 30,000 | $0.00 | 30,000 | D | A |
| 23 Dec, 2024 | Steve Elms | Common Stock | A | 11,085 | $3.20 | 325,370 | I | P |
| 23 Dec, 2024 | Enterprise Associates 16, L.P. New | Common Stock | A | 554,250 | $3.20 | 1,625,678 | D | P |
| 23 Dec, 2024 | Enterprise Associates 16, L.P. New | Common Stock | A | 554,250 | $3.20 | 1,625,678 | D | P |
| 23 Dec, 2024 | Enterprise Associates 16, L.P. New | Common Stock | A | 554,250 | $3.20 | 1,625,678 | D | P |
| 23 Dec, 2024 | Enterprise Associates 16, L.P. New | Common Stock | A | 554,250 | $3.20 | 1,625,678 | D | P |
| 23 Dec, 2024 | Enterprise Associates 16, L.P. New | Common Stock | A | 554,250 | $3.20 | 1,625,678 | D | P |