ASMB's three largest insider shareholders as of September 29, 2026 are Sciences, Inc. Gilead (TenPercentOwner, 4.98Mn shares), Alexander Schornstein (TenPercentOwner, 728.11K shares), Jason A Okazaki (Ceo And President, 163.35K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Sciences, Inc. Gilead | TenPercentOwner | 4,977,089 | 0 | 4,977,089 | 82.2% | 27 May, 2026 |
| 2 | Alexander Schornstein | TenPercentOwner | 728,113 | 0 | 728,113 | 12.0% | 25 Nov, 2024 |
| 3 | Jason A Okazaki | Ceo And President | 163,354 | 0 | 163,354 | 2.7% | 05 Jun, 2026 |
| 4 | William E Iv Delaney | Chief Scientific Officer | 60,330 | 0 | 60,330 | 1.0% | 05 Jun, 2026 |
| 5 | Nicole S White | Chief Manufacturing Officer | 48,145 | 0 | 48,145 | 0.8% | 05 Jun, 2026 |
| 6 | Anuj Gaggar | Chief Medical Officer | 42,688 | 0 | 42,688 | 0.7% | 05 Jun, 2026 |
| 7 | John G Mchutchison | Chief Executive Officer | 18,347 | 0 | 18,347 | 0.3% | 15 Apr, 2025 |
| 8 | Jeanette M Bjorkquist | Pfo And Pao | 14,560 | 0 | 14,560 | 0.2% | 18 Jun, 2026 |
| 9 | Michael Houghton | Director | 0 | 3,202 | 3,202 | 0.1% | 31 Dec, 2024 |
| 10 | Michael P. Samar | Chief Financial Officer | 1,287 | 0 | 1,287 | 0.0% | 26 Jul, 2022 |
| 11 | Luisa M Stamm | Chief Medical Officer | 672 | 0 | 672 | 0.0% | 31 Mar, 2022 |
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 |
|---|---|---|---|---|---|---|---|---|
| 17 Jun, 2026 | Jeanette M Bjorkquist | Pfo And Pao | Disposed S | 29 | $23.25 | $674 | 14,560 | Direct |
| 04 Jun, 2026 | Anthony E Altig | Director | Acquired A | 8,000 | $0.00 | $0 | 8,000 | Direct |
| 29 Mar, 2026 | Jeanette M Bjorkquist | Pfo And Pao | Acquired A | 3,500 | $0.00 | $0 | 14,589 | Direct |
| 04 Jun, 2026 | Michael Houghton | Director | Acquired A | 8,000 | $0.00 | $0 | 8,000 | Direct |
| 29 Mar, 2026 | Anuj Gaggar | Chief Medical Officer | Acquired A | 14,000 | $0.00 | $0 | 42,688 | Direct |
| 29 Mar, 2026 | Nicole S White | Chief Manufacturing Officer | Acquired A | 14,000 | $0.00 | $0 | 48,145 | Direct |
| 04 Jun, 2026 | Susan Mahony | Director | Acquired A | 8,000 | $0.00 | $0 | 8,000 | Direct |
| 04 Jun, 2026 | Gina Consylman | Director | Acquired A | 8,000 | $0.00 | $0 | 8,000 | Direct |
| 29 Mar, 2026 | Jason A Okazaki | Ceo And President | Acquired A | 50,750 | $0.00 | $0 | 163,354 | Direct |
| 04 Jun, 2026 | John G Mchutchison | Director | Acquired A | 8,000 | $0.00 | $0 | 8,000 | Direct |
| 04 Jun, 2026 | Lisa Johnson-Pratt | Director | Acquired A | 8,000 | $0.00 | $0 | 8,000 | Direct |
| 29 Mar, 2026 | William E Iv Delaney | Chief Scientific Officer | Acquired A | 14,000 | $0.00 | $0 | 60,330 | Direct |
| 26 May, 2026 | Sciences, Inc. Gilead | TenPercentOwner | Acquired A | 471,698 | $26.50 | $12.50Mn | 4,977,089 | Direct |
| 29 Mar, 2026 | Anuj Gaggar | Chief Medical Officer | Acquired A | 26,000 | $0.00 | $0 | 28,000 | Direct |
| 29 Mar, 2026 | William E Iv Delaney | Chief Scientific Officer | Acquired A | 26,000 | $0.00 | $0 | 45,642 | Direct |
| 29 Mar, 2026 | Nicole S White | Chief Manufacturing Officer | Acquired A | 26,000 | $0.00 | $0 | 37,674 | Direct |
| 29 Mar, 2026 | Jeanette M Bjorkquist | Pfo And Pao | Acquired A | 6,500 | $0.00 | $0 | 11,417 | Direct |
| 29 Mar, 2026 | Jason A Okazaki | Ceo And President | Acquired A | 94,250 | $0.00 | $0 | 111,916 | Direct |
| 30 Mar, 2026 | Nicole S White | Chief Manufacturing Officer | Disposed S | 188 | $26.65 | $5.01K | 37,486 | Direct |
| 30 Mar, 2026 | Jeanette M Bjorkquist | Pfo And Pao | Disposed S | 312 | $26.65 | $8.31K | 11,105 | Direct |