ABOS's three largest insider shareholders as of September 09, 2026 are Robert D. Hardie (TenPercentOwner, 3.86Mn shares), Capital Ventures Discovery Fund Iii, L.P. Sands (TenPercentOwner, 3.42Mn shares), Daniel Joseph Oconnell (Chief Executive Officer, 881.27K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Robert D. Hardie | TenPercentOwner | 0 | 3,859,141 | 3,859,141 | 39.0% | 08 Jul, 2021 |
| 2 | Capital Ventures Discovery Fund Iii, L.P. Sands | TenPercentOwner | 3,417,075 | 0 | 3,417,075 | 34.5% | 08 Jul, 2021 |
| 3 | Daniel Joseph Oconnell | Chief Executive Officer | 881,275 | 0 | 881,275 | 8.9% | 23 Jan, 2026 |
| 4 | Matt Zuga | Cfo Chief Business Officer | 304,924 | 0 | 304,924 | 3.1% | 23 Jan, 2026 |
| 5 | Eric Siemers | Chief Medical Officer | 255,371 | 0 | 255,371 | 2.6% | 23 Jan, 2026 |
| 6 | James J. Doherty | President And Cdo | 220,900 | 0 | 220,900 | 2.2% | 21 Jan, 2026 |
| 7 | John A Iii Stalfort | Director | 220,624 | 0 | 220,624 | 2.2% | 05 Jun, 2026 |
| 8 | Russell Barton | Chief Operating Officer | 205,092 | 0 | 205,092 | 2.1% | 23 Jan, 2026 |
| 9 | Derek M Meisner | Chief Legal Officer Corp Sec | 173,999 | 0 | 173,999 | 1.8% | 10 Mar, 2026 |
| 10 | Amy Schacterle | Chief Regulatory Officer | 92,303 | 0 | 92,303 | 0.9% | 21 Jan, 2026 |
| 11 | Jeffrey L. Ives | Director | 48,300 | 0 | 48,300 | 0.5% | 05 Jun, 2026 |
| 12 | Capital Management, L.P. Ra | Director, TenPercentOwner | 0 | 48,300 | 48,300 | 0.5% | 05 Jun, 2026 |
| 13 | Kimberlee C Drapkin | Director | 48,300 | 0 | 48,300 | 0.5% | 05 Jun, 2026 |
| 14 | Nathan B Fountain | Director | 48,150 | 0 | 48,150 | 0.5% | 10 Jun, 2026 |
| 15 | Derrell Porter | Director | 35,500 | 0 | 35,500 | 0.4% | 17 Jun, 2026 |
| 16 | George Golumbeski | Director | 35,500 | 0 | 35,500 | 0.4% | 05 Jun, 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 |
|---|---|---|---|---|---|---|---|---|
| 15 Jun, 2026 | Derrell Porter | Director | Acquired M | 6,460 | $1.07 | $6.91K | 54,760 | Direct |
| 15 Jun, 2026 | Derrell Porter | Director | Disposed S | 6,460 | $2.35 | $15.15K | 48,300 | Direct |
| 16 Jun, 2026 | Derrell Porter | Director | Disposed S | 12,800 | $2.33 | $29.77K | 35,500 | Direct |
| 17 Jun, 2026 | Derrell Porter | Director | Acquired M | 13,040 | $1.07 | $13.95K | 48,540 | Direct |
| 17 Jun, 2026 | Derrell Porter | Director | Disposed S | 13,040 | $2.33 | $30.32K | 35,500 | Direct |
| 15 Jun, 2026 | Derrell Porter | Director | Disposed M | 6,460 | $0.00 | $0 | 13,040 | Direct |
| 17 Jun, 2026 | Derrell Porter | Director | Disposed M | 13,040 | $0.00 | $0 | 0 | Direct |
| 09 Jun, 2026 | Nathan B Fountain | Director | Disposed S | 6,400 | $2.23 | $14.27K | 48,150 | Direct |
| 03 Jun, 2026 | Derrell Porter | Director | Acquired A | 35,500 | $0.00 | $0 | 48,300 | Direct |
| 03 Jun, 2026 | Jeffrey L. Ives | Director | Acquired A | 35,500 | $0.00 | $0 | 48,300 | Direct |
| 03 Jun, 2026 | John A Iii Stalfort | Director | Acquired A | 35,500 | $0.00 | $0 | 220,624 | Direct |
| 03 Jun, 2026 | Nathan B Fountain | Director | Acquired A | 35,500 | $0.00 | $0 | 54,550 | Direct |
| 03 Jun, 2026 | Capital Management, L.P. Ra | Director, TenPercentOwner | Acquired A | 35,500 | $0.00 | $0 | 48,300 | Indirect |
| 03 Jun, 2026 | George Golumbeski | Director | Acquired A | 35,500 | $0.00 | $0 | 35,500 | Direct |
| 03 Jun, 2026 | Kimberlee C Drapkin | Director | Acquired A | 35,500 | $0.00 | $0 | 48,300 | Direct |
| 03 Jun, 2026 | Laura Stoppel | Director | Acquired A | 35,500 | $0.00 | $0 | 48,300 | Direct |
| 03 Jun, 2026 | John A Iii Stalfort | Director | Acquired A | 53,250 | $0.00 | $0 | 53,250 | Direct |
| 03 Jun, 2026 | Laura Stoppel | Director | Acquired A | 53,250 | $0.00 | $0 | 53,250 | Direct |
| 03 Jun, 2026 | Nathan B Fountain | Director | Acquired A | 53,250 | $0.00 | $0 | 53,250 | Direct |
| 03 Jun, 2026 | Derrell Porter | Director | Acquired A | 53,250 | $0.00 | $0 | 53,250 | Direct |