Assembly Biosciences's three largest insider shareholders as of April 17, 2026 are Sciences, Inc. Gilead (TenPercentOwner, 4.51Mn shares), Alexander Schornstein (TenPercentOwner, 728.11K shares), Jason A Okazaki (Ceo And President, 111.92K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Sciences, Inc. Gilead | - | 4,505,391 | 0 | 03 Oct, 2025 |
| Alexander Schornstein | - | 728,113 | 0 | 25 Nov, 2024 |
| Jason A Okazaki | Ceo And President | 111,916 | 0 | 31 Mar, 2026 |
| William E Iv Delaney | Chief Scientific Officer | 45,642 | 0 | 31 Mar, 2026 |
| Luisa M Stamm | Chief Medical Officer | 40,315 | 0 | 31 Mar, 2022 |
| Nicole S White | Chief Manufacturing Officer | 37,477 | 0 | 31 Mar, 2026 |
| Anuj Gaggar | Chief Medical Officer | 28,000 | 0 | 31 Mar, 2026 |
| John G Mchutchison | Chief Executive Officer | 18,347 | 0 | 15 Apr, 2025 |
| Jeanette M Bjorkquist | Pfo And Pao | 11,089 | 0 | 31 Mar, 2026 |
| Michael Houghton | - | 0 | 3,202 | 31 Dec, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 29 Mar, 2026 | William E Iv Delaney | Common Stock | A | 26,000 | $0.00 | 45,642 | D | A |
| 29 Mar, 2026 | Nicole S White | Common Stock | A | 26,000 | $0.00 | 37,674 | D | A |
| 29 Mar, 2026 | Jason A Okazaki | Common Stock | A | 94,250 | $0.00 | 111,916 | D | A |
| 29 Mar, 2026 | Jeanette M Bjorkquist | Common Stock | A | 6,500 | $0.00 | 11,417 | D | A |
| 29 Mar, 2026 | Anuj Gaggar | Common Stock | A | 26,000 | $0.00 | 28,000 | D | A |
| 30 Mar, 2026 | Nicole S White | Common Stock | D | 188 | $26.65 | 37,486 | D | S |
| 30 Mar, 2026 | Jeanette M Bjorkquist | Common Stock | D | 312 | $26.65 | 11,105 | D | S |
| 30 Mar, 2026 | Jeanette M Bjorkquist | Common Stock | D | 16 | $27.49 | 11,089 | D | S |
| 30 Mar, 2026 | Nicole S White | Common Stock | D | 9 | $27.49 | 37,477 | D | S |
| 08 Aug, 2025 | Sciences, Inc. Gilead | Common Stock | A | 2,295,920 | - | 4,505,391 | D | P |
| 08 Aug, 2025 | Sciences, Inc. Gilead | Class A warrants to purchase Common Stock | A | 1,147,960 | - | 1,147,960 | D | P |
| 08 Aug, 2025 | Sciences, Inc. Gilead | Class B warrants to purchase Common Stock | A | 1,147,960 | - | 1,147,960 | D | P |
| 16 Jun, 2025 | Jeanette M Bjorkquist | Common Stock | A | 300 | $0.00 | 5,097 | D | A |
| 16 Jun, 2025 | Jeanette M Bjorkquist | Stock Option (right to buy) | A | 600 | $0.00 | 600 | D | A |
| 05 Jun, 2025 | Susan Mahony | Stock Option (right to buy) | A | 3,500 | $0.00 | 3,500 | D | A |
| 05 Jun, 2025 | John G Mchutchison | Stock Option (right to buy) | A | 3,500 | $0.00 | 3,500 | D | A |
| 05 Jun, 2025 | Anthony E Altig | Stock Option (right to buy) | A | 3,500 | $0.00 | 3,500 | D | A |
| 05 Jun, 2025 | Lisa Johnson-Pratt | Stock Option (right to buy) | A | 3,500 | $0.00 | 3,500 | D | A |
| 05 Jun, 2025 | Michael Houghton | Stock Option (right to buy) | A | 3,500 | $0.00 | 3,500 | D | A |
| 31 Mar, 2025 | John G Mchutchison | Common Stock | D | 757 | $9.85 | 18,347 | D | S |