Assembly Biosciences, Inc.

ASMB

Exchange: Nasdaq
Industry: Pharmaceutical Preparations
SEC CIK: 0001426800

SEC filings (opens in a new tab)

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.

13F holders, Q3 2026

Institutional positions in Assembly Biosciences, Inc. as of Sep 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Q3 2026 data is still coming in (13F filing deadline: Nov 16, 2026), so these numbers are incomplete.

Institutional holders: 19; +5 vs. Q2 2026
Shares held: 5.49M; −62.1K (−1.1%) vs. Q2 2026
Total value: $128.8M; −$23.6M (−15.5%) vs. Q2 2026
New holders: 6; 9 more added
Sold out: 1; 1 more reduced

79 institutions that held it in Q2 2026 haven't filed for Q3 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2026: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting ASMB on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holders

Value held

Institutions holding ASMB and their total value by quarter
Quarter	Holders	Value
Q2 2026	93	$514.8M
Q1 2026	76	$376.4M
Q4 2025	70	$466.7M
Q3 2025	58	$324.9M
Q2 2025	34	$57.1M
Q1 2025	38	$30.4M
Q4 2024	36	$50.3M
Q3 2024	30	$15.5M
Q2 2024	27	$16.1M
Q1 2024	24	$8.61M
Q4 2023	45	$7.09M
Q3 2023	32	$8.44M
Q2 2023	32	$12.0M
Q1 2023	38	$10.1M
Q4 2022	40	$18.4M
Q3 2022	50	$27.2M
Q2 2022	54	$36.1M
Q1 2022	54	$39.3M
Q4 2021	62	$53.8M
Q3 2021	65	$79.0M
Q2 2021	91	$105.1M
Q1 2021	107	$133.6M

Institutions, Q3 2026

Shares, value and share of portfolio for each institution holding Assembly Biosciences, Inc.; share changes are against Q2 2026.

Institutions holding ASMB in Q3 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
Gilead Sciences, Inc.	4,977,089	$116.9M	7.99%	00.0%	Unchanged
Geode Capital Management, LLC	361,152	$8.48M	0.00%	+80,728+28.8%	Added
Squarepoint Ops LLC	73,732	$1.73M	0.00%	+39,518+115.5%	Added
Bank of New York Mellon Corp	32,972	$774.5K	0.00%	+8,957+37.3%	Added
Barclays PLC	16,838	$395.5K	0.00%	+10,705+174.5%	Added
Deutsche Bank AG	11,243	$264.1K	0.00%	+1,628+16.9%	Added
Citigroup Inc	5,578	$131.0K	0.00%	+1,024+22.5%	Added
Police & Firemen's Retirement System of New Jersey	3,763	$88.4K	0.00%	+856+29.4%	Added
State of Alaska, Department of Revenue	989	$23.0K	0.00%	+989	New
Russell Investments Group, Ltd.	788	$18.5K	0.00%	00.0%	Unchanged
Simplex Trading, LLC	480	$11.3K	0.00%	+480	New
Sterling Capital Management LLC	260	$6.11K	0.00%	+61+30.7%	Added
EverSource Wealth Advisors, LLC	59	$1.39K	0.00%	+4+7.3%	Added
Parkside Financial Bank & Trust	54	$1.27K	0.00%	+54	New
GAMMA Investing LLC	20	$470	0.00%	+20	New
Caitong International Asset Management Co., Ltd	14	$329	0.00%	−61−81.3%	Reduced
Allworth Financial LP	10	$275	0.00%	00.0%	Unchanged
The PNC Financial Services Group, Inc.	5	$117	0.00%	+5	New
Root Financial Partners, LLC	1	$23	0.00%	+1	New
Standard Life Aberdeen plc	0	$0	0.00%	−207,047−100.0%	Sold out
Farallon Capital Management, L.L.C.	–	–	–	–	Not filed
Paradigm Biocapital Advisors LP	–	–	–	–	Not filed
Commodore Capital LP	–	–	–	–	Not filed
Ra Capital Management, L.P.	–	–	–	–	Not filed
Jupiter Topco LLC	–	–	–	–	Not filed
BlackRock, Inc.	–	–	–	–	Not filed
Parkman Healthcare Partners LLC	–	–	–	–	Not filed
Vanguard Capital Management LLC	–	–	–	–	Not filed
Point72 Asset Management, L.P.	–	–	–	–	Not filed
Seven Fleet Capital Management LP	–	–	–	–	Not filed
Millennium Management LLC	–	–	–	–	Not filed
Schonfeld Strategic Advisors LLC	–	–	–	–	Not filed
Ameriprise Financial Inc	–	–	–	–	Not filed
DV Equities, LLC	–	–	–	–	Not filed
Affinity Asset Advisors, LLC	–	–	–	–	Not filed
B Group, Inc.	–	–	–	–	Not filed
State Street Corp	–	–	–	–	Not filed
StemPoint Capital LP	–	–	–	–	Not filed
Squadron Capital Management LLC	–	–	–	–	Not filed
Woodline Partners LP	–	–	–	–	Not filed
Driehaus Capital Management LLC	–	–	–	–	Not filed
Ally Bridge Group (NY) LLC	–	–	–	–	Not filed
Goldman Sachs Group Inc	–	–	–	–	Not filed
Northern Trust Corp	–	–	–	–	Not filed
Franklin Resources Inc	–	–	–	–	Not filed
Citadel Advisors LLC	–	–	–	–	Not filed
Vanguard Portfolio Management LLC	–	–	–	–	Not filed
Vanguard Fiduciary Trust Co	–	–	–	–	Not filed
HighVista Strategies LLC	–	–	–	–	Not filed
Qube Research & Technologies Ltd	–	–	–	–	Not filed
Monimus Capital Management, LP	–	–	–	–	Not filed
Trexquant Investment LP	–	–	–	–	Not filed
JPMorgan Chase & Co	–	–	–	–	Not filed
Morgan Stanley	–	–	–	–	Not filed
Gsa Capital Partners LLP	–	–	–	–	Not filed
XTX Topco Ltd	–	–	–	–	Not filed
UBS Group AG	–	–	–	–	Not filed
Renaissance Technologies LLC	–	–	–	–	Not filed
Charles Schwab Investment Management Inc	–	–	–	–	Not filed
BNP Paribas Arbitrage, SA	–	–	–	–	Not filed
Connor, Clark & Lunn Investment Management Ltd.	–	–	–	–	Not filed
Caption Management, LLC	–	–	–	–	Not filed
ADAR1 Capital Management, LLC	–	–	–	–	Not filed
Palumbo Wealth Management LLC	–	–	–	–	Not filed
Two Sigma Investments, LP	–	–	–	–	Not filed
Engineers Gate Manager LP	–	–	–	–	Not filed
Marshall Wace, LLP	–	–	–	–	Not filed
Nuveen, LLC	–	–	–	–	Not filed
Eversept Partners, LP	–	–	–	–	Not filed
Susquehanna Portfolio Strategies, LLC	–	–	–	–	Not filed
Virtus Investment Advisers, Inc.	–	–	–	–	Not filed
American Century Companies Inc	–	–	–	–	Not filed
Invesco Ltd.	–	–	–	–	Not filed
Rhumbline Advisers	–	–	–	–	Not filed
Integrated Quantitative Investments LLC	–	–	–	–	Not filed
Bank of America Corp	–	–	–	–	Not filed
Canada Pension Plan Investment Board	–	–	–	–	Not filed
EntryPoint Capital, LLC	–	–	–	–	Not filed
Wells Fargo & Company	–	–	–	–	Not filed
Price T Rowe Associates Inc	–	–	–	–	Not filed
Brevan Howard Capital Management LP	–	–	–	–	Not filed
Persistent Asset Partners Ltd	–	–	–	–	Not filed
MetLife Investment Management	–	–	–	–	Not filed
Vanguard Global Advisers, LLC	–	–	–	–	Not filed
Mirae Asset Global ETFs Holdings Ltd.	–	–	–	–	Not filed
New York State Common Retirement Fund	–	–	–	–	Not filed
Legal & General Group Plc	–	–	–	–	Not filed
Ameritas Investment Partners, Inc.	–	–	–	–	Not filed
HSBC Holdings PLC	–	–	–	–	Not filed
Tower Research Capital LLC (TRC)	–	–	–	–	Not filed
Royal Bank of Canada	–	–	–	–	Not filed
Northwestern Mutual Wealth Management Co	–	–	–	–	Not filed
Accent Capital Management, LLC	–	–	–	–	Not filed
Truvestments Capital LLC	–	–	–	–	Not filed
FMR LLC	–	–	–	–	Not filed
California State Teachers Retirement System	–	–	–	–	Not filed
Advisor Group Holdings, Inc.	–	–	–	–	Not filed
Quarry LP	–	–	–	–	Not filed
BFC Planning, Inc.	–	–	–	–	Not filed