ABUS's three largest insider shareholders as of August 29, 2026 are Sciences Ltd. Roivant (TenPercentOwner, 38.85Mn shares), Michael J. Mcelhaugh (Interim President Ceo, 1.66Mn shares), Michael J. Mcelhaugh (Interim President Ceo, 1.66Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Michael J. Mcelhaugh | Interim President Ceo | 1,658,003 | 0 | 1,658,003 | 43.1% | 19 Feb, 2025 |
| 2 | Michael J. Sofia | Chief Scientific Officer | 1,485,121 | 0 | 1,485,121 | 38.6% | 05 Feb, 2024 |
| 3 | William H. Collier | President And Ceo | 216,500 | 0 | 216,500 | 5.6% | 03 Feb, 2023 |
| 4 | Karen Sims | Chief Medical Officer | 155,494 | 0 | 155,494 | 4.0% | 19 Feb, 2025 |
| 5 | J. Christopher Naftzger | General Counsel And Cco | 140,544 | 0 | 140,544 | 3.7% | 19 Feb, 2025 |
| 6 | Elizabeth Howard | Evp, Gc, Compliance | 86,024 | 0 | 86,024 | 2.2% | 03 Feb, 2023 |
| 7 | Tuan Nguyen | Chief Financial Officer | 73,500 | 0 | 73,500 | 1.9% | 02 Feb, 2026 |
| 8 | Lindsay Androski | President And Ceo | 28,000 | 0 | 28,000 | 0.7% | 02 Feb, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 08 Jun, 2026 | Roger Sawhney | Director | Acquired A | 78,800 | $0.00 | $0 | 78,800 | Direct |
| 08 Jun, 2026 | Robert A Beardsley | Director | Acquired A | 78,800 | $0.00 | $0 | 78,800 | Direct |
| 02 Feb, 2026 | Tuan Nguyen | Chief Financial Officer | Acquired A | 73,500 | $0.00 | $0 | 73,500 | Direct |
| 02 Feb, 2026 | Tuan Nguyen | Chief Financial Officer | Acquired A | 73,500 | $0.00 | $0 | 73,500 | Direct |
| 02 Feb, 2026 | Tuan Nguyen | Chief Financial Officer | Acquired A | 73,500 | $0.00 | $0 | 73,500 | Direct |
| 02 Feb, 2026 | Lindsay Androski | President And Ceo | Acquired A | 28,000 | $0.00 | $0 | 28,000 | Direct |
| 02 Feb, 2026 | Tuan Nguyen | Chief Financial Officer | Acquired A | 73,500 | $0.00 | $0 | 73,500 | Direct |
| 02 Feb, 2026 | Tuan Nguyen | Chief Financial Officer | Acquired A | 188,400 | $0.00 | $0 | 188,400 | Direct |
| 02 Feb, 2026 | Tuan Nguyen | Chief Financial Officer | Acquired A | 188,400 | $0.00 | $0 | 188,400 | Direct |
| 02 Feb, 2026 | Tuan Nguyen | Chief Financial Officer | Acquired A | 188,400 | $0.00 | $0 | 188,400 | Direct |
| 02 Feb, 2026 | Tuan Nguyen | Chief Financial Officer | Acquired A | 188,400 | $0.00 | $0 | 188,400 | Direct |
| 02 Feb, 2026 | Lindsay Androski | President And Ceo | Acquired A | 71,700 | $0.00 | $0 | 71,700 | Direct |
| 04 Aug, 2025 | Roger Sawhney | Director | Acquired A | 157,600 | $0.00 | $0 | 157,600 | Direct |
| 31 Mar, 2025 | Tuan Nguyen | Chief Financial Officer | Acquired A | 750,000 | $0.00 | $0 | 750,000 | Direct |
| 31 Mar, 2025 | Tuan Nguyen | Chief Financial Officer | Acquired A | 750,000 | $0.00 | $0 | 750,000 | Direct |
| 31 Mar, 2025 | Tuan Nguyen | Chief Financial Officer | Acquired A | 750,000 | $0.00 | $0 | 750,000 | Direct |
| 31 Mar, 2025 | Tuan Nguyen | Chief Financial Officer | Acquired A | 750,000 | $0.00 | $0 | 750,000 | Direct |
| 31 Mar, 2025 | Tuan Nguyen | Chief Financial Officer | Acquired A | 750,000 | $0.00 | $0 | 750,000 | Direct |
| 31 Mar, 2025 | Tuan Nguyen | Chief Financial Officer | Acquired A | 750,000 | $0.00 | $0 | 750,000 | Direct |
| 31 Mar, 2025 | Tuan Nguyen | Chief Financial Officer | Acquired A | 750,000 | $0.00 | $0 | 750,000 | Direct |