Assembly Biosciences, Inc. (ASMB) Insider Ownership

Historic Insider Ownership Trends

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).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
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