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ASMB Insider Trading

Insider Ownership Percentage: 5.30%
Insider Buying (Last 12 Months): $49,983.22
Insider Selling (Last 12 Months): $12,726.20

Assembly Biosciences Insider Trading History Chart

This chart shows the insider buying and selling history at Assembly Biosciences by year and by quarter.

Skip ChartChart Data in Insider Trading History Table

Assembly Biosciences Share Price & Price History

Current Price: $35.27
Price Change: ▲ Price Increase of +0.27 (0.77%)
As of 12/4/2025 05:00 PM ET

This chart shows the closing price history over time for ASMB up to the past year.

Skip Chart and Table DataPrice Data in Insider Trading History Table
Days: 30 | 90 | 365

Assembly Biosciences Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
3/31/2025Jason A OkazakiCEOSell355$9.85$3,496.7514,757View SEC Filing Icon  
3/31/2025Jeanette M BjorkquistInsiderSell180$9.85$1,773.004,617View SEC Filing Icon  
3/31/2025John G. McHutchisonDirectorSell757$9.85$7,456.4518,347View SEC Filing Icon  
12/30/2024Michael HoughtonDirectorBuy3,202$15.61$49,983.223,202View SEC Filing Icon  
11/18/2024Nicole S WhiteInsiderSell40$16.29$651.6011,871View SEC Filing Icon  
10/8/2024Alexander SchornsteinMajor ShareholderBuy10,000$14.58$145,800.00703,113View SEC Filing Icon  
10/3/2024Jason A OkazakiCEOSell197$14.81$2,917.5714,904View SEC Filing Icon  
10/3/2024Nicole S WhiteInsiderSell157$14.81$2,325.1711,911View SEC Filing Icon  
7/5/2024Alexander SchornsteinMajor ShareholderBuy4,438$12.52$55,563.76693,113View SEC Filing Icon  
7/3/2024Alexander SchornsteinMajor ShareholderBuy4,562$12.29$56,066.98688,675View SEC Filing Icon  
5/23/2024Jason A OkazakiCEOSell549$14.93$8,196.5716,082View SEC Filing Icon  
5/23/2024Jeanette M BjorkquistInsiderSell24$14.93$358.323,142View SEC Filing Icon  
5/23/2024John G. McHutchisonDirectorSell2,117$14.93$31,606.8119,104View SEC Filing Icon  
4/30/2024Jason A OkazakiCEOSell1,569$12.71$19,941.9916,423View SEC Filing Icon  
4/30/2024Nicole S WhiteInsiderSell1,255$12.71$15,951.0513,025View SEC Filing Icon  
4/1/2024Jason A OkazakiCEOSell354$13.07$4,626.7813,826View SEC Filing Icon  
4/1/2024Jeanette M BjorkquistInsiderSell114$13.07$1,489.983,166View SEC Filing Icon  
4/1/2024John G. McHutchisonDirectorSell1,206$13.07$15,762.4221,221View SEC Filing Icon  
3/27/2024Jason A OkazakiCEOSell392$12.87$5,045.0414,180View SEC Filing Icon  
1/17/2024Alexander SchornsteinMajor ShareholderBuy24,999$9.36$233,990.64655,357View SEC Filing Icon  
10/3/2023Jason A OkazakiCEOSell196$9.60$1,881.6014,576View SEC Filing Icon  
10/3/2023Nicole S WhiteInsiderSell157$9.60$1,507.207,854View SEC Filing Icon  
7/24/2023Jeanette M BjorkquistInsiderSell70$12.84$898.802,224View SEC Filing Icon  
5/23/2023Jason A OkazakiCEOSell546$12.48$6,814.0810,551View SEC Filing Icon  
5/23/2023Jeanette M BjorkquistInsiderSell22$12.48$274.562,294View SEC Filing Icon  
5/23/2023John G. McHutchisonDirectorSell2,164$12.48$27,006.7214,096View SEC Filing Icon  
3/30/2023Jason A OkazakiCEOSell353$9.84$3,473.528,181View SEC Filing Icon  
3/30/2023Jeanette M BjorkquistInsiderSell64$9.84$629.761,983View SEC Filing Icon  
3/30/2023John G. McHutchisonDirectorSell1,240$9.84$12,201.6014,802View SEC Filing Icon  
3/27/2023Jason A OkazakiCEOSell391$12.24$4,785.848,535View SEC Filing Icon  
See Full Table

SEC Filings (Institutional Ownership Changes) for Assembly Biosciences (NASDAQ:ASMB)

19.92% of Assembly Biosciences stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at ASMB by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

Assembly Biosciences Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
11/17/2025Qube Research & Technologies Ltd11,030$0.28M0.0%N/A0.144%Search for SEC Filing on Google Icon
11/17/2025RA Capital Management L.P.1,020,410$26.12M0.3%N/A13.300%Search for SEC Filing on Google Icon
11/17/2025Parkman Healthcare Partners LLC250,981$6.43M0.7%N/A3.271%Search for SEC Filing on Google Icon
11/17/2025Millennium Management LLC21,608$0.55M0.0%N/A0.282%Search for SEC Filing on Google Icon
11/17/2025Farallon Capital Management LLC1,227,590$31.43M0.1%N/A16.001%Search for SEC Filing on Google Icon
11/17/2025Citadel Advisors LLC53,878$1.38M0.0%+50.8%0.702%Search for SEC Filing on Google Icon
11/17/2025Commodore Capital LP1,000,000$25.60M1.2%N/A13.034%Search for SEC Filing on Google Icon
11/17/2025Bank of America Corp DE3,371$86K0.0%+6,382.7%0.044%Search for SEC Filing on Google Icon
11/14/2025Schonfeld Strategic Advisors LLC121,888$3.12M0.0%N/A1.589%Search for SEC Filing on Google Icon
11/14/2025ADAR1 Capital Management LLC18,947$0.49M0.0%N/A0.247%Search for SEC Filing on Google Icon
11/14/2025B Group Inc.175,706$4.50M3.4%-7.2%2.290%Search for SEC Filing on Google Icon
11/10/2025Palumbo Wealth Management LLC34,798$0.89M0.2%+86.4%0.454%Search for SEC Filing on Google Icon
11/10/2025Patient Square Capital LP135,182$3.46M0.9%N/A1.762%Search for SEC Filing on Google Icon
11/7/2025GSA Capital Partners LLP12,420$0.32M0.0%-16.3%0.162%Search for SEC Filing on Google Icon
11/7/2025Vanguard Group Inc.502,112$12.85M0.0%+97.8%6.545%Search for SEC Filing on Google Icon
10/16/2025Ellsworth Advisors LLC29,950$0.85M0.2%N/A0.390%Search for SEC Filing on Google Icon
8/15/2025Man Group plc13,227$0.24M0.0%-26.3%0.172%Search for SEC Filing on Google Icon
8/14/2025B Group Inc.189,350$3.43M2.6%-5.3%2.469%Search for SEC Filing on Google Icon
8/8/2025Geode Capital Management LLC51,015$0.93M0.0%+6.9%0.668%Search for SEC Filing on Google Icon
7/15/2025Palumbo Wealth Management LLC18,667$0.34M0.1%+3.8%0.244%Search for SEC Filing on Google Icon
5/21/2025Acadian Asset Management LLC23,027$0.22M0.0%+42.1%0.301%Search for SEC Filing on Google Icon
5/15/2025Armistice Capital LLC23,858$0.23M0.0%-85.8%0.312%Search for SEC Filing on Google Icon
5/13/2025American Century Companies Inc.11,799$0.11M0.0%N/A0.154%Search for SEC Filing on Google Icon
4/22/2025Palumbo Wealth Management LLC17,986$0.17M0.1%+57.4%0.240%Search for SEC Filing on Google Icon
2/17/2025Man Group plc19,567$0.31M0.0%N/A0.308%Search for SEC Filing on Google Icon
2/14/2025Northern Trust Corp28,649$0.45M0.0%-3.9%0.450%Search for SEC Filing on Google Icon
2/14/2025B Group Inc.50,651$0.80M0.5%N/A0.796%Search for SEC Filing on Google Icon
2/14/2025Gilead Sciences Inc.2,209,471$34.87M2.2%N/A34.740%Search for SEC Filing on Google Icon
2/13/2025Marshall Wace LLP14,823$0.23M0.0%+16.5%0.233%Search for SEC Filing on Google Icon
2/13/2025Renaissance Technologies LLC94,711$1.50M0.0%+44.3%1.489%Search for SEC Filing on Google Icon
2/12/2025JPMorgan Chase & Co.11,427$0.18M0.0%+225.6%0.180%Search for SEC Filing on Google Icon
2/10/2025Monimus Capital Management LP42,067$0.66M0.6%N/A0.661%Search for SEC Filing on Google Icon
1/30/2025Palumbo Wealth Management LLC11,427$0.18M0.1%N/A0.180%Search for SEC Filing on Google Icon
1/29/2025Peapod Lane Capital LLC62,970$0.99M1.0%N/A0.990%Search for SEC Filing on Google Icon
12/26/2024JPMorgan Chase & Co.3,509$53K0.0%+5,137.3%0.055%Search for SEC Filing on Google Icon
11/16/2024Geode Capital Management LLC47,034$0.71M0.0%-13.6%0.740%Search for SEC Filing on Google Icon
11/13/2024FMR LLC15,855$0.24M0.0%+29.7%0.249%Search for SEC Filing on Google Icon
8/15/2024Armistice Capital LLC468,000$6.42M0.1%N/A8.489%Search for SEC Filing on Google Icon
8/9/2024Renaissance Technologies LLC54,911$0.75M0.0%+39.2%0.997%Search for SEC Filing on Google Icon
8/6/2024Acadian Asset Management LLC13,558$0.18M0.0%+131.0%0.246%Search for SEC Filing on Google Icon
5/10/2024Acadian Asset Management LLC5,868$78K0.0%-91.7%0.107%Search for SEC Filing on Google Icon
5/10/2024Vanguard Group Inc.196,368$2.61M0.0%-91.6%3.581%Search for SEC Filing on Google Icon
5/7/2024Marquette Asset Management LLC9,016$0.12M0.0%-83.4%0.165%Search for SEC Filing on Google Icon
2/2/2024Marquette Asset Management LLC54,464$45K0.0%N/A0.083%Search for SEC Filing on Google Icon
2/2/2024Acuitas Investments LLC265,585$0.22M0.1%N/A0.404%Search for SEC Filing on Google Icon
1/31/2024Federated Hermes Inc.304,735$0.25M0.0%-10.9%0.463%Search for SEC Filing on Google Icon
12/7/2023Hudson Bay Capital Management LP199,789$0.18M0.0%-75.8%0.304%Search for SEC Filing on Google Icon
11/13/2023Acadian Asset Management LLC83,470$73K0.0%-26.7%0.127%Search for SEC Filing on Google Icon
8/7/2023Acadian Asset Management LLC113,854$0.13M0.0%-27.7%0.218%Search for SEC Filing on Google Icon
5/12/2023Platinum Investment Management Ltd.890,736$0.75M0.0%-18.6%1.709%Search for SEC Filing on Google Icon
5/8/2023Federated Hermes Inc.363,023$0.31M0.0%-2.8%0.699%Search for SEC Filing on Google Icon
2/14/2023Susquehanna International Group LLP21,255$28K0.0%-37.7%0.044%Search for SEC Filing on Google Icon
2/13/2023Platinum Investment Management Ltd.1,094,770$1.42M0.1%-24.5%2.244%Search for SEC Filing on Google Icon
2/10/2023Connor Clark & Lunn Investment Management Ltd.65,393$85K0.0%-49.6%0.134%Search for SEC Filing on Google Icon
11/15/2022Platinum Investment Management Ltd.1,450,328$2.38M0.1%-8.9%2.973%Search for SEC Filing on Google Icon
11/14/2022Healthcare of Ontario Pension Plan Trust Fund570,300$0.94M0.0%N/A1.169%Search for SEC Filing on Google Icon
11/10/2022Connor Clark & Lunn Investment Management Ltd.129,752$0.21M0.0%-9.2%0.268%Search for SEC Filing on Google Icon
11/7/2022Virtu Financial LLC30,046$49K0.0%N/A0.062%Search for SEC Filing on Google Icon
11/3/2022Barclays PLC37,194$61K0.0%-76.9%0.077%Search for SEC Filing on Google Icon
10/27/2022Assenagon Asset Management S.A.253,783$0.42M0.0%-62.9%0.524%Search for SEC Filing on Google Icon
9/16/2022Federated Hermes Inc.373,665$0.79M0.0%-2.0%0.771%Search for SEC Filing on Google Icon
8/11/2022Platinum Investment Management Ltd.1,591,272$3.34M0.1%-16.7%3.300%Search for SEC Filing on Google Icon
8/5/2022Connor Clark & Lunn Investment Management Ltd.142,915$0.30M0.0%-13.4%0.296%Search for SEC Filing on Google Icon
7/27/2022Assenagon Asset Management S.A.684,846$1.44M0.0%+1,422.3%1.420%Search for SEC Filing on Google Icon
7/19/2022Commonwealth Equity Services LLC25,749$54K0.0%+30.4%0.053%Search for SEC Filing on Google Icon
5/16/2022Eversept Partners LP280,000$0.58M0.0%-9.7%0.582%Search for SEC Filing on Google Icon
5/12/2022Acadian Asset Management LLC927,402$1.91M0.0%-42.4%1.927%Search for SEC Filing on Google Icon
5/11/2022GSA Capital Partners LLP135,834$0.28M0.0%N/A0.282%Search for SEC Filing on Google Icon
4/26/2022Marquette Asset Management LLC58,246$0.12M0.0%+21.3%0.121%Search for SEC Filing on Google Icon
4/25/2022Assenagon Asset Management S.A.44,987$93K0.0%N/A0.093%Search for SEC Filing on Google Icon
2/14/2022Deep Track Capital LP3,000,000$6.99M0.5%N/A6.268%Search for SEC Filing on Google Icon
2/14/2022Eversept Partners LP310,000$0.72M0.1%-11.4%0.648%Search for SEC Filing on Google Icon
2/10/2022Candriam Luxembourg S.C.A.1,838,221$4.28M0.0%+25.1%3.841%Search for SEC Filing on Google Icon
2/10/2022Acadian Asset Management LLC1,608,760$3.75M0.0%+13.9%3.361%Search for SEC Filing on Google Icon
2/10/2022Connor Clark & Lunn Investment Management Ltd.170,216$0.40M0.0%+8.8%0.356%Search for SEC Filing on Google Icon
2/9/2022Dimensional Fund Advisors LP553,428$1.29M0.0%+54.0%1.156%Search for SEC Filing on Google Icon
1/21/2022Russell Investments Group Ltd.123,748$0.29M0.0%+41.2%0.259%Search for SEC Filing on Google Icon
1/19/2022Marquette Asset Management LLC48,000$0.11M0.0%+73.7%0.100%Search for SEC Filing on Google Icon
12/29/2021Hudson Bay Capital Management LP850,000$2.96M0.0%+13.3%1.776%Search for SEC Filing on Google Icon
11/16/2021Two Sigma Advisers LP348,700$1.21M0.0%-53.9%0.729%Search for SEC Filing on Google Icon
11/15/2021Hudson Bay Capital Management LP850,000$2.96M0.0%+13.3%1.776%Search for SEC Filing on Google Icon
11/15/2021Eversept Partners LP350,000$1.22M0.1%N/A0.731%Search for SEC Filing on Google Icon
11/15/2021Dimensional Fund Advisors LP359,315$1.25M0.0%-23.4%0.751%Search for SEC Filing on Google Icon
11/15/2021Franklin Resources Inc.584,688$2.04M0.0%+10.6%1.222%Search for SEC Filing on Google Icon
11/12/2021Renaissance Technologies LLC130,600$0.45M0.0%-63.3%0.273%Search for SEC Filing on Google Icon
11/12/2021Prosight Management LP265,634$0.92M0.5%+78.2%0.555%Search for SEC Filing on Google Icon
11/12/2021Geode Capital Management LLC525,263$1.83M0.0%+11.2%1.097%Search for SEC Filing on Google Icon
11/12/2021Connor Clark & Lunn Investment Management Ltd.156,415$0.54M0.0%+3.1%0.327%Search for SEC Filing on Google Icon
11/10/2021Goldman Sachs Group Inc.131,367$0.46M0.0%-30.8%0.292%Search for SEC Filing on Google Icon
11/10/2021IndexIQ Advisors LLC97,739$0.34M0.0%+11.1%0.204%Search for SEC Filing on Google Icon
11/9/2021Barclays PLC212,980$0.74M0.0%+31.3%0.445%Search for SEC Filing on Google Icon
11/9/2021BlackRock Inc.1,969,977$6.86M0.0%+3.0%4.116%Search for SEC Filing on Google Icon
11/9/2021Candriam Luxembourg S.C.A.1,468,846$5.11M0.0%+31.9%3.069%Search for SEC Filing on Google Icon
11/8/2021Russell Investments Group Ltd.87,636$0.30M0.0%+72.7%0.195%Search for SEC Filing on Google Icon
10/12/2021Marquette Asset Management LLC27,641$96K0.0%+21.8%0.061%Search for SEC Filing on Google Icon
9/3/2021Parametric Portfolio Associates LLC89,340$0.35M0.0%+106.5%0.199%Search for SEC Filing on Google Icon
8/16/2021State Street Corp170,423$0.66M0.0%-72.2%0.379%Search for SEC Filing on Google Icon
8/16/2021Goldman Sachs Group Inc.189,721$0.74M0.0%+18.9%0.422%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
Assembly Biosciences logo
Assembly Biosciences, Inc., a biotechnology company, develops therapeutic candidates for the treatment of viral diseases. It develops ABI-5366, a long-acting herpes simplex virus (HSV) helicase-primase inhibitor that is in Phase 1a/1b clinical trial to treat recurrent genital herpes; ABI-1179, which is in Phase 1a/1b clinical trial for the treatment of recurrent genital herpes; and ABI-6250, a small molecule orally bioavailable hepatitis delta virus entry inhibitor that is in Phase 1a clinical trial. The company also develops ABI-4334, a next-generation capsid assembly modulator, which is in Phase 1b clinical trial for the treatment of hepatitis B virus (HBV). In addition, it develops an oral non-nucleoside polymerase inhibitor targeting transplant-related herpesviruses; and a small molecule interferon-a receptor agonist targeting HBV and HDV. The company has collaboration agreements with Gilead Sciences, Inc. and BeiGene, Ltd. The company was formerly known as Ventrus Biosciences, Inc. and changed its name to Assembly Biosciences, Inc. in June 2014. Assembly Biosciences, Inc. was incorporated in 2005 and is headquartered in South San Francisco, California.
Read More on Assembly Biosciences

Today's Range

Now: $35.27
Low: $34.52
High: $35.82

50 Day Range

MA: $31.10
Low: $23.32
High: $38.50

52 Week Range

Now: $35.27
Low: $7.75
High: $39.71

Volume

45,842 shs

Average Volume

126,843 shs

Market Capitalization

$557.97 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

1.14

Who are the company insiders with the largest holdings of Assembly Biosciences?

Assembly Biosciences' top insider investors include:
  1. Alexander Schornstein (Major Shareholder)
  2. John G Mchutchison (Director)
  3. Jason A Okazaki (CEO)
  4. Nicole S White (Insider)
  5. Jeanette M Bjorkquist (Insider)
  6. Michael Houghton (Director)
Learn More about top insider investors at Assembly Biosciences.

Who are the major institutional investors of Assembly Biosciences?

Assembly Biosciences' top institutional shareholders include:
  1. Farallon Capital Management LLC — 16.00%
  2. RA Capital Management L.P. — 13.30%
  3. Commodore Capital LP — 13.03%
  4. Vanguard Group Inc. — 6.54%
  5. Parkman Healthcare Partners LLC — 3.27%
  6. B Group Inc. — 2.29%
Learn More about top institutional investors of Assembly Biosciences stock.

Which major investors are selling Assembly Biosciences stock?

Within the previous quarter, ASMB stock was sold by these institutional investors:
  1. B Group Inc.
  2. GSA Capital Partners LLP
In the previous year, company insiders that have sold Assembly Biosciences company stock include:
  1. Alexander Schornstein (Major Shareholder)
  2. John G Mchutchison (Director)
  3. Jason A Okazaki (CEO)
Learn More investors selling Assembly Biosciences stock.

Which major investors are buying Assembly Biosciences stock?

In the previous quarter, ASMB stock was bought by institutional investors including:
  1. Farallon Capital Management LLC
  2. RA Capital Management L.P.
  3. Commodore Capital LP
  4. Parkman Healthcare Partners LLC
  5. Vanguard Group Inc.
  6. Patient Square Capital LP
  7. Schonfeld Strategic Advisors LLC
  8. Ellsworth Advisors LLC
During the last year, these company insiders have bought Assembly Biosciences stock:
  1. Alexander Schornstein (Major Shareholder)
  2. John G Mchutchison (Director)
Learn More investors buying Assembly Biosciences stock.