As of August 29, 2026, the three largest insider holders of IMRX are Asset Management, Lp Cormorant (TenPercentOwner, 2.90Mn shares), Benjamin J. Zeskind (President And Ceo, 2.32Mn shares), Benjamin J. Zeskind (President And Ceo, 2.31Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Asset Management, Lp Cormorant | TenPercentOwner | 0 | 2,895,273 | 2,895,273 | 49.0% | 03 Apr, 2024 |
| 2 | Benjamin J. Zeskind | President And Ceo | 2,315,252 | 0 | 2,315,252 | 39.2% | 24 Jun, 2026 |
| 3 | Brett Matthew Hall | Chief Scientific Officer | 382,531 | 0 | 382,531 | 6.5% | 16 Jun, 2026 |
| 4 | Peter Feinberg | Director | 0 | 135,441 | 135,441 | 2.3% | 14 Jan, 2026 |
| 5 | Ann E Berman | Director | 67,465 | 0 | 67,465 | 1.1% | 19 Mar, 2024 |
| 6 | Leah R Neufeld | Chief People Officer | 29,598 | 0 | 29,598 | 0.5% | 17 Mar, 2026 |
| 7 | Mallory Morales | Chief Accounting Officer | 27,533 | 0 | 27,533 | 0.5% | 02 Oct, 2025 |
| 8 | Laurie Keating | Director | 14,000 | 0 | 14,000 | 0.2% | 17 May, 2022 |
| 9 | Harold Eugene Brakewood | Chief Business Officer | 11,050 | 0 | 11,050 | 0.2% | 21 Jan, 2026 |
| 10 | Biren Amin | Cfo, Treasurer | 7,898 | 0 | 7,898 | 0.1% | 12 May, 2022 |
| 11 | Scott Barrett | Chief Medical Officer | 7,563 | 0 | 7,563 | 0.1% | 22 Mar, 2022 |
| 12 | Diana Hausman | Director | 2,500 | 3,000 | 5,500 | 0.1% | 07 Jul, 2025 |
| 13 | Michael Bookman | Chief Legal Officer, Secretary | 4,870 | 0 | 4,870 | 0.1% | 02 Oct, 2025 |
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 |
|---|---|---|---|---|---|---|---|---|
| 16 Jul, 2026 | Andrew Gengos | Chief Financial Officer | Acquired A | 650,000 | $0.00 | $0 | 650,000 | Direct |
| 23 Jun, 2026 | Benjamin J. Zeskind | President And Ceo | Acquired P | 2,400 | $4.56 | $10.95K | 2,315,252 | Direct |
| 15 Jun, 2026 | Brett Matthew Hall | Chief Scientific Officer | Acquired P | 6,035 | $4.15 | $25.05K | 382,531 | Direct |
| 11 Jun, 2026 | Laurie Keating | Director | Acquired A | 33,350 | $0.00 | $0 | 33,350 | Direct |
| 11 Jun, 2026 | Thomas J. Schall | Director | Acquired A | 33,350 | $0.00 | $0 | 33,350 | Direct |
| 11 Jun, 2026 | Peter Feinberg | Director | Acquired A | 33,350 | $0.00 | $0 | 33,350 | Direct |
| 13 Mar, 2026 | Leah R Neufeld | Chief People Officer | Acquired A | 3,628 | $4.29 | $15.57K | 29,598 | Direct |
| 13 Mar, 2026 | Leah R Neufeld | Chief People Officer | Acquired A | 3,628 | $4.29 | $15.57K | 29,598 | Direct |
| 13 Mar, 2026 | Leah R Neufeld | Chief People Officer | Acquired A | 3,628 | $4.29 | $15.57K | 29,598 | Direct |
| 13 Mar, 2026 | Leah R Neufeld | Chief People Officer | Acquired A | 3,628 | $4.29 | $15.57K | 29,598 | Direct |
| 03 Feb, 2026 | Igor Matushansky | Chief Medical Officer | Acquired A | 140,000 | $0.00 | $0 | 140,000 | Direct |
| 03 Feb, 2026 | Igor Matushansky | Chief Medical Officer | Acquired A | 140,000 | $0.00 | $0 | 140,000 | Direct |
| 03 Feb, 2026 | Mallory Morales | Svp Finance, Cao | Acquired A | 140,000 | $0.00 | $0 | 140,000 | Direct |
| 03 Feb, 2026 | Igor Matushansky | Chief Medical Officer | Acquired A | 140,000 | $0.00 | $0 | 140,000 | Direct |
| 03 Feb, 2026 | Benjamin J. Zeskind | President And Ceo | Acquired A | 688,000 | $0.00 | $0 | 688,000 | Direct |
| 03 Feb, 2026 | Benjamin J. Zeskind | President And Ceo | Acquired A | 688,000 | $0.00 | $0 | 688,000 | Direct |
| 03 Feb, 2026 | Mallory Morales | Svp Finance, Cao | Acquired A | 140,000 | $0.00 | $0 | 140,000 | Direct |
| 03 Feb, 2026 | Benjamin J. Zeskind | President And Ceo | Acquired A | 688,000 | $0.00 | $0 | 688,000 | Direct |
| 03 Feb, 2026 | Leah R Neufeld | Chief People Officer | Acquired A | 140,000 | $0.00 | $0 | 140,000 | Direct |
| 03 Feb, 2026 | Leah R Neufeld | Chief People Officer | Acquired A | 140,000 | $0.00 | $0 | 140,000 | Direct |