Immuneering's three largest insider shareholders as of September 29, 2026 are Asset Management, Lp Cormorant (TenPercentOwner, 2.90Mn shares), Benjamin J. Zeskind (President And Ceo, 2.32Mn shares), Brett Matthew Hall (Chief Scientific Officer, 382.53K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Asset Management, Lp Cormorant | TenPercentOwner | 0 | 2,895,273 | 2,895,273 | 48.4% | 03 Apr, 2024 |
| 2 | Benjamin J. Zeskind | President And Ceo | 2,315,252 | 0 | 2,315,252 | 38.7% | 24 Jun, 2026 |
| 3 | Brett Matthew Hall | Chief Scientific Officer | 382,531 | 0 | 382,531 | 6.4% | 16 Jun, 2026 |
| 4 | Peter Feinberg | Director | 0 | 135,441 | 135,441 | 2.3% | 14 Jan, 2026 |
| 5 | Thomas J. Schall | Director | 74,530 | 0 | 74,530 | 1.2% | 20 Jan, 2026 |
| 6 | Ann E Berman | Director | 67,465 | 0 | 67,465 | 1.1% | 19 Mar, 2024 |
| 7 | Leah R Neufeld | Chief People Officer | 29,598 | 0 | 29,598 | 0.5% | 17 Mar, 2026 |
| 8 | Mallory Morales | Chief Accounting Officer | 27,533 | 0 | 27,533 | 0.5% | 02 Oct, 2025 |
| 9 | Laurie Keating | Director | 14,000 | 0 | 14,000 | 0.2% | 17 May, 2022 |
| 10 | Harold Eugene Brakewood | Chief Business Officer | 11,050 | 0 | 11,050 | 0.2% | 21 Jan, 2026 |
| 11 | Biren Amin | Cfo, Treasurer | 7,898 | 0 | 7,898 | 0.1% | 12 May, 2022 |
| 12 | Scott Barrett | Chief Medical Officer | 7,563 | 0 | 7,563 | 0.1% | 22 Mar, 2022 |
| 13 | Diana Hausman | Director | 2,500 | 3,000 | 5,500 | 0.1% | 07 Jul, 2025 |
| 14 | 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 | 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 |
| 11 Jun, 2026 | Laurie Keating | Director | Acquired A | 33,350 | $0.00 | $0 | 33,350 | Direct |
| 11 Jun, 2026 | Robert J Carpenter | Director | Acquired A | 33,350 | $0.00 | $0 | 33,350 | Direct |
| 11 Jun, 2026 | Diana Hausman | 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 |
| 03 Feb, 2026 | Michael Bookman | Chief Legal Officer, Secretary | Acquired A | 176,000 | $0.00 | $0 | 176,000 | 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 | Igor Matushansky | Chief Medical Officer | Acquired A | 140,000 | $0.00 | $0 | 140,000 | Direct |
| 03 Feb, 2026 | Brett Matthew Hall | Chief Scientific Officer | Acquired A | 344,000 | $0.00 | $0 | 344,000 | Direct |
| 03 Feb, 2026 | Harold Eugene Brakewood | Chief Business 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 |
| 16 Jan, 2026 | Harold Eugene Brakewood | Chief Business Officer | Acquired P | 5,250 | $4.76 | $24.99K | 11,050 | Direct |
| 15 Jan, 2026 | Thomas J. Schall | Director | Acquired P | 21,645 | $4.67 | $101.04K | 74,530 | Direct |
| 15 Jan, 2026 | Brett Matthew Hall | Chief Scientific Officer | Acquired P | 2,298 | $4.57 | $10.50K | 376,496 | Direct |
| 13 Jan, 2026 | Leah R Neufeld | Chief People Officer | Acquired P | 2,626 | $4.15 | $10.91K | 25,970 | Direct |