IMRX's three largest insider shareholders as of April 28, 2026 are Asset Management, Lp Cormorant (TenPercentOwner, 2.90Mn shares), Asset Management, Lp Cormorant (TenPercentOwner, 2.90Mn shares), Asset Management, Lp Cormorant (TenPercentOwner, 2.90Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Asset Management, Lp Cormorant | - | 0 | 2,895,273 | 03 Apr, 2024 |
| Asset Management, Lp Cormorant | - | 0 | 2,895,273 | 03 Apr, 2024 |
| Asset Management, Lp Cormorant | - | 0 | 2,895,273 | 03 Apr, 2024 |
| Asset Management, Lp Cormorant | - | 0 | 2,895,273 | 03 Apr, 2024 |
| Asset Management, Lp Cormorant | - | 0 | 2,895,273 | 03 Apr, 2024 |
| Asset Management, Lp Cormorant | - | 0 | 2,895,273 | 03 Apr, 2024 |
| Benjamin J. Zeskind | President And Ceo | 2,312,852 | 0 | 03 Jul, 2025 |
| Asset Management, Lp Cormorant | - | 0 | 2,252,628 | 05 Aug, 2021 |
| Asset Management, Lp Cormorant | - | 0 | 2,252,628 | 05 Aug, 2021 |
| Asset Management, Lp Cormorant | - | 0 | 2,252,628 | 05 Aug, 2021 |
| Asset Management, Lp Cormorant | - | 0 | 2,252,628 | 05 Aug, 2021 |
| Asset Management, Lp Cormorant | - | 0 | 2,252,628 | 05 Aug, 2021 |
| Asset Management, Lp Cormorant | - | 0 | 2,252,628 | 05 Aug, 2021 |
| Robert J Carpenter | - | 1,148,839 | 0 | 04 Aug, 2021 |
| Peter Feinberg | - | 0 | 392,242 | 15 Sep, 2021 |
| Brett Matthew Hall | Chief Scientific Officer | 376,496 | 0 | 16 Jan, 2026 |
| Peter Feinberg | - | 156,766 | 0 | 07 Oct, 2025 |
| Peter Feinberg | - | 0 | 135,441 | 14 Jan, 2026 |
| Peter Feinberg | - | 0 | 115,441 | 04 Aug, 2021 |
| Thomas J. Schall | - | 74,530 | 0 | 20 Jan, 2026 |
| Ann E Berman | - | 67,465 | 0 | 19 Mar, 2024 |
| Leah R Neufeld | Chief People Officer | 29,598 | 0 | 17 Mar, 2026 |
| Mallory Morales | Chief Accounting Officer | 27,533 | 0 | 02 Oct, 2025 |
| Laurie Keating | - | 14,000 | 0 | 17 May, 2022 |
| Harold Eugene Brakewood | Chief Business Officer | 11,050 | 0 | 21 Jan, 2026 |
| Biren Amin | Cfo, Treasurer | 7,898 | 0 | 12 May, 2022 |
| Scott Barrett | Chief Medical Officer | 7,563 | 0 | 22 Mar, 2022 |
| Diana Hausman | - | 2,500 | 3,000 | 07 Jul, 2025 |
| Michael Bookman | Chief Legal Officer, Secretary | 4,870 | 0 | 02 Oct, 2025 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 13 Mar, 2026 | Leah R Neufeld | Class A Common Stock | A | 3,628 | $4.29 | 29,598 | D | A |
| 03 Feb, 2026 | Leah R Neufeld | Stock Option | A | 140,000 | $0.00 | 140,000 | D | A |
| 03 Feb, 2026 | Michael Bookman | Stock Option | A | 176,000 | $0.00 | 176,000 | D | A |
| 03 Feb, 2026 | Mallory Morales | Stock Option | A | 140,000 | $0.00 | 140,000 | D | A |
| 03 Feb, 2026 | Brett Matthew Hall | Stock Option | A | 344,000 | $0.00 | 344,000 | D | A |
| 03 Feb, 2026 | Igor Matushansky | Stock Option | A | 140,000 | $0.00 | 140,000 | D | A |
| 03 Feb, 2026 | Benjamin J. Zeskind | Stock Option | A | 688,000 | $0.00 | 688,000 | D | A |
| 03 Feb, 2026 | Harold Eugene Brakewood | Stock Option | A | 140,000 | $0.00 | 140,000 | D | A |
| 16 Jan, 2026 | Harold Eugene Brakewood | Class A Common Stock | A | 5,250 | $4.76 | 11,050 | D | P |
| 15 Jan, 2026 | Thomas J. Schall | Class A Common Stock | A | 21,645 | $4.67 | 74,530 | D | P |
| 15 Jan, 2026 | Brett Matthew Hall | Class A Common Stock | A | 2,298 | $4.57 | 376,496 | D | P |
| 13 Jan, 2026 | Leah R Neufeld | Class A Common Stock | A | 2,626 | $4.15 | 25,970 | D | P |
| 12 Jan, 2026 | Peter Feinberg | Class A Common Stock | A | 20,000 | $4.35 | 135,441 | I | P |
| 01 Jan, 2026 | Peter Feinberg | Stock Option | A | 7,888 | $0.00 | 7,888 | D | A |
| 01 Jan, 2026 | Laurie Keating | Stock Option | A | 7,888 | $0.00 | 7,888 | D | A |
| 03 Oct, 2025 | Peter Feinberg | Class A Common Stock | A | 7,500 | $6.67 | 156,766 | D | P |
| 01 Oct, 2025 | Mallory Morales | Class A Common Stock | A | 300 | $6.39 | 27,533 | D | P |
| 01 Oct, 2025 | Michael Bookman | Class A Common Stock | A | 1,020 | $6.83 | 4,870 | D | P |
| 01 Oct, 2025 | Leah R Neufeld | Class A Common Stock | A | 800 | $6.38 | 23,344 | D | P |
| 30 Sep, 2025 | Peter Feinberg | Class A Common Stock | A | 7,500 | $7.03 | 149,266 | D | P |