As of September 29, 2026, the three largest insider holders of ABOS are Capital Management, L.P. Ra (Director, 13.04Mn shares), Daniel Joseph Oconnell (Chief Executive Officer, 881.27K shares), Matt Zuga (Cfo Chief Business Officer, 304.92K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Daniel Joseph Oconnell | Chief Executive Officer | 881,275 | 0 | 881,275 | 33.0% | 23 Jan, 2026 |
| 2 | Matt Zuga | Cfo Chief Business Officer | 304,924 | 0 | 304,924 | 11.4% | 23 Jan, 2026 |
| 3 | Eric Siemers | Chief Medical Officer | 255,371 | 0 | 255,371 | 9.6% | 23 Jan, 2026 |
| 4 | James J. Doherty | President And Cdo | 220,900 | 0 | 220,900 | 8.3% | 21 Jan, 2026 |
| 5 | John A Iii Stalfort | Director | 220,624 | 0 | 220,624 | 8.3% | 05 Jun, 2026 |
| 6 | Russell Barton | Chief Operating Officer | 205,092 | 0 | 205,092 | 7.7% | 23 Jan, 2026 |
| 7 | Derek M Meisner | Chief Legal Officer Corp Sec | 173,999 | 0 | 173,999 | 6.5% | 10 Mar, 2026 |
| 8 | Amy Schacterle | Chief Regulatory Officer | 92,303 | 0 | 92,303 | 3.5% | 21 Jan, 2026 |
| 9 | Capital Management, L.P. Ra | Director, TenPercentOwner | 0 | 48,300 | 48,300 | 1.8% | 05 Jun, 2026 |
| 10 | Kimberlee C Drapkin | Director | 48,300 | 0 | 48,300 | 1.8% | 05 Jun, 2026 |
| 11 | Jeffrey L. Ives | Director | 48,300 | 0 | 48,300 | 1.8% | 05 Jun, 2026 |
| 12 | Laura Stoppel | Director | 48,300 | 0 | 48,300 | 1.8% | 05 Jun, 2026 |
| 13 | Nathan B Fountain | Director | 48,150 | 0 | 48,150 | 1.8% | 10 Jun, 2026 |
| 14 | George Golumbeski | Director | 35,500 | 0 | 35,500 | 1.3% | 05 Jun, 2026 |
| 15 | Derrell Porter | Director | 35,500 | 0 | 35,500 | 1.3% | 17 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 | Laura Stoppel | 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 | Capital Management, L.P. Ra | Director, TenPercentOwner | Acquired A | 35,500 | $0.00 | $0 | 48,300 | Indirect |
| 03 Jun, 2026 | Nathan B Fountain | Director | Acquired A | 35,500 | $0.00 | $0 | 54,550 | Direct |
| 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 | Jeffrey L. Ives | Director | Acquired A | 35,500 | $0.00 | $0 | 48,300 | Direct |
| 03 Jun, 2026 | Derrell Porter | Director | Acquired A | 35,500 | $0.00 | $0 | 48,300 | Direct |
| 03 Jun, 2026 | George Golumbeski | 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 | Derrell Porter | Director | Acquired A | 53,250 | $0.00 | $0 | 53,250 | Direct |
| 03 Jun, 2026 | Kimberlee C Drapkin | Director | Acquired A | 53,250 | $0.00 | $0 | 53,250 | Direct |