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Assembly Biosciences, Inc.

ASMB
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001426800

In the last 90 days, Assembly Biosciences, Inc. insiders filed 0 open-market purchases and 4 sales; 93 institutions reported holding it in 13F filings for Q2 2026, worth $514.8M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Assembly Biosciences, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
4 filings
4 insiders, $237.6K in total
Insiders trading
4
Net value
−$237.6K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Assembly Biosciences, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Assembly Biosciences, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Bjorkquist Jeanette MPFO and PAO17,673Nov 3, 20264
White Nicole SChief Manufacturing Officer59,257Nov 3, 20263
Delaney William E IVChief Scientific Officer74,035Nov 3, 20263
Gaggar AnujChief Medical Officer53,800Nov 3, 20263
Okazaki Jason ACEO and President195,532Nov 3, 20263
Altig Anthony EDirector–Jun 5, 20261
Mahony SusanDirector–Jun 5, 20261
Consylman GinaDirector–Jun 5, 20261
McHutchison John GDirector18,347Jun 5, 20261
Johnson-Pratt LisaDirector–Jun 5, 20261
Houghton MichaelDirector3,202IndirectJun 5, 20261
Gilead Sciences, Inc.10% Owner4,977,089May 27, 20261
Ringo William RDirector–Jun 9, 20250
Schornstein Alexander10% Owner728,113Nov 26, 20240
Samar Michael P.Chief Financial Officer77,228Jul 26, 20220
DiMarchi Richard DDirector–May 27, 20220
Stamm Luisa MChief Medical Officer40,315Mar 31, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Nov 3, 2026 (view filing)4:50 PM ETNov 21 dayBjorkquist Jeanette MPFO and PAOSSale−727$19.62−$14.3K−4.0%17.7K after2 lots
Nov 3, 2026 (view filing)4:45 PM ETNov 21 dayWhite Nicole SChief Manufacturing OfficerSSale−2.59K$19.62−$50.9K−4.2%59.3K after2 lots
Nov 3, 2026 (view filing)4:35 PM ETNov 21 dayGaggar AnujChief Medical OfficerSSale−2.59K$19.62−$50.9K−4.6%53.8K after2 lots
Nov 3, 2026 (view filing)4:30 PM ETNov 21 dayOkazaki Jason ACEO and PresidentSSale−6.20K$19.62−$121.7K−3.1%195.5K after2 lots
Jun 18, 2026 (view filing)Jun 171 dayBjorkquist Jeanette MPFO and PAOSSale−29$23.25−$674.25−0.2%14.6K after
Mar 31, 2026 (view filing)Mar 301 dayBjorkquist Jeanette MPFO and PAOSSale−328$26.69−$8.75K−2.9%11.1K after2 lots
Mar 31, 2026 (view filing)Mar 301 dayWhite Nicole SChief Manufacturing OfficerSSale−197$26.69−$5.26K−0.5%37.5K after2 lots
Oct 3, 2025 (view filing)Aug 856 daysLateGilead Sciences, Inc.10% OwnerPPurchase+2.30M––+103.9%4.51M after
Oct 3, 2025 (view filing)Aug 856 daysLateGilead Sciences, Inc.10% OwnerPPurchase+2.30M–––1.15M afterDerivative2 lots
Apr 15, 2025 (view filing)Mar 3115 daysLateMcHutchison John GDirectorSSale−757$9.85−$7.46K−4.0%18.3K after
Apr 1, 2025 (view filing)Mar 311 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−180$9.85−$1.77K−3.8%4.62K after
Apr 1, 2025 (view filing)Mar 311 dayOkazaki Jason ACEO and PresidentSSale−355$9.85−$3.50K−2.3%14.8K after
Apr 1, 2025 (view filing)Mar 311 dayWhite Nicole SChief Manufacturing OfficerSSale−197$9.85−$1.94K−1.7%11.7K after
Dec 31, 2024 (view filing)Dec 301 dayHoughton MichaelDirectorPPurchase+3.20K$15.61+$50.0KNew position3.20K after
Dec 23, 2024 (view filing)Dec 194 daysGilead Sciences, Inc.10% OwnerPPurchase+940.5K$21.37+$20.1M+74.1%2.21M after
Nov 26, 2024 (view filing)Nov 22-254 daysSchornstein Alexander10% OwnerPPurchase+25.0K$14.88+$372.0K+3.6%728.1K after3 lots
Nov 19, 2024 (view filing)Nov 181 dayWhite Nicole SChief Manufacturing OfficerSSale−40$16.29−$651.6−0.3%11.9K after
Oct 9, 2024 (view filing)Oct 81 daySchornstein Alexander10% OwnerPPurchase+10.0K$14.58+$145.8K+1.4%703.1K after
Oct 4, 2024 (view filing)Oct 31 dayWhite Nicole SChief Manufacturing OfficerSSale−157$14.81−$2.33K−1.3%11.9K after
Oct 4, 2024 (view filing)Oct 31 dayOkazaki Jason ACEO and PresidentSSale−197$14.81−$2.92K−1.3%14.9K after
Aug 5, 2024 (view filing)Aug 23 daysWhite Nicole SChief Manufacturing OfficerSSale−785$14.23−$11.2K−6.1%12.1K after
Aug 5, 2024 (view filing)Aug 23 daysOkazaki Jason ACEO and PresidentSSale−981$14.23−$14.0K−6.1%15.1K after
Jul 8, 2024 (view filing)Jul 3-55 daysSchornstein Alexander10% OwnerPPurchase+9.00K$12.40+$111.6K+1.3%693.1K after2 lots
Jun 20, 2024 (view filing)Jun 173 daysGilead Sciences, Inc.10% OwnerPPurchase+179.5K––+16.5%1.27M after
Jun 20, 2024 (view filing)Jun 173 daysGilead Sciences, Inc.10% OwnerPPurchase+179.5K–––179.5K afterDerivative
May 24, 2024 (view filing)May 231 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−24$14.93−$358.32−0.8%3.14K after
May 24, 2024 (view filing)May 231 dayMcHutchison John GDirectorSSale−2.12K$14.93−$31.6K−10.0%19.1K after
May 24, 2024 (view filing)May 231 dayOkazaki Jason ACEO and PresidentSSale−549$14.93−$8.20K−3.3%16.1K after
May 24, 2024 (view filing)May 231 dayWhite Nicole SChief Manufacturing OfficerSSale−172$14.93−$2.57K−1.3%12.9K after
May 1, 2024 (view filing)Apr 301 dayWhite Nicole SChief Manufacturing OfficerSSale−1.25K$12.71−$16.0K−8.8%13.0K after
May 1, 2024 (view filing)Apr 301 dayOkazaki Jason ACEO and PresidentSSale−1.57K$12.71−$19.9K−8.7%16.4K after
Apr 2, 2024 (view filing)Apr 11 dayMcHutchison John GDirectorSSale−1.21K$13.07−$15.8K−5.4%21.2K after
Apr 2, 2024 (view filing)Apr 11 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−114$13.07−$1.49K−3.5%3.17K after
Apr 2, 2024 (view filing)Apr 11 dayWhite Nicole SChief Manufacturing OfficerSSale−197$13.07−$2.57K−1.8%10.9K after
Apr 2, 2024 (view filing)Apr 11 dayOkazaki Jason ACEO and PresidentSSale−354$13.07−$4.63K−2.5%13.8K after
Mar 29, 2024 (view filing)Mar 272 daysOkazaki Jason ACEO and PresidentSSale−392$12.87−$5.05K−2.7%14.2K after
Jan 19, 2024 (view filing)Jan 17-182 daysSchornstein Alexander10% OwnerPPurchase+645.1K$0.7907+$510.1K+8.5%8.21M after2 lots
Nov 22, 2023 (view filing)Nov 20-212 daysSchornstein Alexander10% OwnerPPurchase+400.0K$0.7075+$283.0K+5.6%7.56M after2 lots
Nov 21, 2023 (view filing)Nov 174 daysWhite Nicole SChief Manufacturing OfficerSSale−477$0.69−$329.13−0.5%93.8K after
Oct 4, 2023 (view filing)Oct 31 dayWhite Nicole SChief Manufacturing OfficerSSale−1.89K$0.80−$1.51K−2.0%94.3K after
Oct 4, 2023 (view filing)Oct 31 dayDelaney William E IVChief Scientific OfficerSSale−1.89K$0.80−$1.51K−1.2%150.9K after
Oct 4, 2023 (view filing)Oct 31 dayOkazaki Jason ACEO and PresidentSSale−2.36K$0.80−$1.89K−1.3%174.9K after
Aug 3, 2023 (view filing)Aug 21 dayDelaney William E IVChief Scientific OfficerSSale−9.46K$1.09−$10.3K−6.2%142.7K after
Aug 3, 2023 (view filing)Aug 21 dayOkazaki Jason ACEO and PresidentSSale−11.8K$1.09−$12.9K−6.7%164.8K after
Jul 25, 2023 (view filing)Jul 241 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−844$1.07−$903.08−3.1%26.7K after
May 31, 2023 (view filing)May 301 dayDelaney William E IVChief Scientific OfficerSSale−4.23K$0.96−$4.06K−3.6%112.2K after
May 24, 2023 (view filing)May 231 dayMcHutchison John GDirectorSSale−26.0K$1.04−$27.0K−13.3%169.2K after
May 24, 2023 (view filing)May 231 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−274$1.04−$284.96−1.0%27.5K after
May 24, 2023 (view filing)May 231 dayDelaney William E IVChief Scientific OfficerSSale−6.56K$1.04−$6.82K−5.3%116.4K after
May 24, 2023 (view filing)May 231 dayOkazaki Jason ACEO and PresidentSSale−6.56K$1.04−$6.82K−4.9%126.6K after