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Assembly Biosciences, Inc.

ASMB
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001426800

No open-market purchases or sales by Assembly Biosciences, Inc. insiders were filed in the last 90 days; 92 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
0 filings
Insiders trading
0
Net value
$0
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 PAO14,560Jun 18, 20263
Altig Anthony EDirector–Jun 5, 20261
Mahony SusanDirector–Jun 5, 20261
Consylman GinaDirector–Jun 5, 20261
McHutchison John GDirector18,347Jun 5, 20261
Okazaki Jason ACEO and President163,354Jun 5, 20262
Delaney William E IVChief Scientific Officer60,330Jun 5, 20262
Johnson-Pratt LisaDirector–Jun 5, 20261
Houghton MichaelDirector3,202IndirectJun 5, 20261
White Nicole SChief Manufacturing Officer48,145Jun 5, 20262
Gaggar AnujChief Medical Officer42,688Jun 5, 20262
Gilead Sciences, Inc.10% Owner4,977,089May 27, 20262
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
Aug 10, 2021 (view filing)Aug 91 dayMcHutchison John GCEO and PresidentSSale−12.2K$3.60−$43.8K−8.8%125.7K after
Mar 29, 2022 (view filing)Mar 281 dayOkazaki Jason AChief Operating OfficerSSale−4.62K$2.24−$10.3K−6.7%64.6K after
Mar 31, 2022 (view filing)Mar 301 dayMcHutchison John GCEO and PresidentSSale−4.61K$2.17−$10.0K−2.2%204.8K after
Mar 31, 2022 (view filing)Mar 301 dayOkazaki Jason AChief Operating OfficerSSale−1.27K$2.17−$2.75K−1.3%94.6K after
Mar 31, 2022 (view filing)Mar 301 dayDelaney William E IVChief Scientific OfficerSSale−1.04K$2.17−$2.25K−1.3%78.1K after
Mar 31, 2022 (view filing)Mar 301 dayStamm Luisa MChief Medical OfficerSSale−1.04K$2.17−$2.25K−2.5%40.3K after
Mar 31, 2022 (view filing)Mar 301 daySamar Michael P.Chief Financial OfficerSSale−2.29K$2.17−$4.96K−2.9%76.7K after
Jun 2, 2022 (view filing)May 312 daysDelaney William E IVChief Scientific OfficerSSale−4.16K$1.92−$7.99K−5.2%76.4K after
Jul 26, 2022 (view filing)Jul 251 daySamar Michael P.Chief Financial OfficerSSale−2.02K$2.22−$4.48K−2.5%77.2K after
Aug 10, 2022 (view filing)Aug 82 daysMcHutchison John GChief Executive OfficerSSale−12.3K$2.13−$26.2K−6.0%192.5K after
Mar 28, 2023 (view filing)Mar 271 dayOkazaki Jason ACEO and PresidentSSale−4.69K$1.02−$4.79K−4.4%102.4K after
Mar 31, 2023 (view filing)Mar 301 dayOkazaki Jason ACEO and PresidentSSale−4.25K$0.82−$3.48K−4.1%98.2K after
Mar 31, 2023 (view filing)Mar 301 dayDelaney William E IVChief Scientific OfficerSSale−3.42K$0.82−$2.81K−3.8%85.5K after
Mar 31, 2023 (view filing)Mar 301 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−774$0.82−$634.68−3.1%23.8K after
Mar 31, 2023 (view filing)Mar 301 dayMcHutchison John GDirectorSSale−14.9K$0.82−$12.2K−7.7%177.6K after
May 24, 2023 (view filing)May 231 dayOkazaki Jason ACEO and PresidentSSale−6.56K$1.04−$6.82K−4.9%126.6K 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 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−274$1.04−$284.96−1.0%27.5K after
May 24, 2023 (view filing)May 231 dayMcHutchison John GDirectorSSale−26.0K$1.04−$27.0K−13.3%169.2K 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
Jul 25, 2023 (view filing)Jul 241 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−844$1.07−$903.08−3.1%26.7K after
Aug 3, 2023 (view filing)Aug 21 dayOkazaki Jason ACEO and PresidentSSale−11.8K$1.09−$12.9K−6.7%164.8K after
Aug 3, 2023 (view filing)Aug 21 dayDelaney William E IVChief Scientific OfficerSSale−9.46K$1.09−$10.3K−6.2%142.7K after
Oct 4, 2023 (view filing)Oct 31 dayOkazaki Jason ACEO and PresidentSSale−2.36K$0.80−$1.89K−1.3%174.9K 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 dayWhite Nicole SChief Manufacturing OfficerSSale−1.89K$0.80−$1.51K−2.0%94.3K after
Nov 21, 2023 (view filing)Nov 174 daysWhite Nicole SChief Manufacturing OfficerSSale−477$0.69−$329.13−0.5%93.8K after
Nov 22, 2023 (view filing)Nov 20-212 daysSchornstein Alexander10% OwnerPPurchase+400.0K$0.7075+$283.0K+5.6%7.56M after2 lots
Jan 19, 2024 (view filing)Jan 17-182 daysSchornstein Alexander10% OwnerPPurchase+645.1K$0.7907+$510.1K+8.5%8.21M after2 lots
Mar 29, 2024 (view filing)Mar 272 daysOkazaki Jason ACEO and PresidentSSale−392$12.87−$5.05K−2.7%14.2K after
Apr 2, 2024 (view filing)Apr 11 dayOkazaki Jason ACEO and PresidentSSale−354$13.07−$4.63K−2.5%13.8K 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 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−114$13.07−$1.49K−3.5%3.17K after
Apr 2, 2024 (view filing)Apr 11 dayMcHutchison John GDirectorSSale−1.21K$13.07−$15.8K−5.4%21.2K after
May 1, 2024 (view filing)Apr 301 dayOkazaki Jason ACEO and PresidentSSale−1.57K$12.71−$19.9K−8.7%16.4K 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 24, 2024 (view filing)May 231 dayWhite Nicole SChief Manufacturing OfficerSSale−172$14.93−$2.57K−1.3%12.9K 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 dayMcHutchison John GDirectorSSale−2.12K$14.93−$31.6K−10.0%19.1K after
May 24, 2024 (view filing)May 231 dayBjorkquist Jeanette MPrincipal Accounting OfficerSSale−24$14.93−$358.32−0.8%3.14K after
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
Jul 8, 2024 (view filing)Jul 3-55 daysSchornstein Alexander10% OwnerPPurchase+9.00K$12.40+$111.6K+1.3%693.1K after2 lots
Aug 5, 2024 (view filing)Aug 23 daysOkazaki Jason ACEO and PresidentSSale−981$14.23−$14.0K−6.1%15.1K after
Aug 5, 2024 (view filing)Aug 23 daysWhite Nicole SChief Manufacturing OfficerSSale−785$14.23−$11.2K−6.1%12.1K after
Oct 4, 2024 (view filing)Oct 31 dayOkazaki Jason ACEO and PresidentSSale−197$14.81−$2.92K−1.3%14.9K after
Oct 4, 2024 (view filing)Oct 31 dayWhite Nicole SChief Manufacturing OfficerSSale−157$14.81−$2.33K−1.3%11.9K after
Oct 9, 2024 (view filing)Oct 81 daySchornstein Alexander10% OwnerPPurchase+10.0K$14.58+$145.8K+1.4%703.1K after
Nov 19, 2024 (view filing)Nov 181 dayWhite Nicole SChief Manufacturing OfficerSSale−40$16.29−$651.6−0.3%11.9K after
Nov 26, 2024 (view filing)Nov 22-254 daysSchornstein Alexander10% OwnerPPurchase+25.0K$14.88+$372.0K+3.6%728.1K after3 lots