Assembly Biosciences, Inc.

ASMB

Exchange: Nasdaq
Industry: Pharmaceutical Preparations
SEC CIK: 0001426800

SEC filings (opens in a new tab)

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.

Q2 2026 vs. Q1 2026

How the institutions holding Assembly Biosciences, Inc. changed between Q1 2026 and Q2 2026.

All holders in Q2 2026 All holders in Q1 2026

13F holders of ASMB: Q1 2026 compared with Q2 2026
Measure	Q1 2026	Of which not filed for Q2 2026	Q2 2026	Change
Holders	75	1	92	+18
Shares	13.6M	849.3K	18.7M	+6.03M (+47.4%)
Value	$376.4M	$23.5M	$514.8M	+$161.9M (+45.9%)

1 institution that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (33)

Institutions that held Assembly Biosciences, Inc. at the end of Q2 2026 but not at the end of Q1 2026.

Institutions new to ASMB in Q2 2026
Institution	Shares	Value	% of portfolio
Jupiter Topco LLC	849,309	$23.4M	0.01%
Ameriprise Financial Inc	230,000	$6.32M	0.00%
DV Equities, LLC	226,415	$6.22M	0.90%
Standard Life Aberdeen plc	207,047	$5.69M	0.01%
Affinity Asset Advisors, LLC	190,000	$5.22M	0.26%
Squadron Capital Management LLC	160,000	$4.40M	1.51%
Woodline Partners LP	150,780	$4.14M	0.01%
Driehaus Capital Management LLC	150,000	$4.12M	0.02%
Ally Bridge Group (NY) LLC	140,000	$3.85M	4.96%
Franklin Resources Inc	113,200	$3.11M	0.00%
Charles Schwab Investment Management Inc	29,128	$800.4K	0.00%
Bank of New York Mellon Corp	24,015	$659.9K	0.00%
Nuveen, LLC	16,875	$463.7K	0.00%
Invesco Ltd.	11,864	$326.0K	0.00%
Integrated Quantitative Investments LLC	10,078	$276.9K	0.05%
Deutsche Bank AG	9,615	$264.2K	0.00%
Wells Fargo & Company	8,253	$226.8K	0.00%
Price T Rowe Associates Inc	8,203	$226.0K	0.00%
Persistent Asset Partners Ltd	6,942	$190.8K	0.06%
MetLife Investment Management	5,885	$161.7K	0.00%
Mirae Asset Global ETFs Holdings Ltd.	4,519	$124.2K	0.00%
New York State Common Retirement Fund	4,200	$115.4K	0.00%
Police & Firemen's Retirement System of New Jersey	2,907	$79.9K	0.00%
Legal & General Group Plc	958	$26.3K	0.00%
Ameritas Investment Partners, Inc.	895	$24.6K	0.00%
Russell Investments Group, Ltd.	788	$21.7K	0.00%
HSBC Holdings PLC	16,935	$17.1K	0.00%
Sterling Capital Management LLC	199	$5.47K	0.00%
Truvestments Capital LLC	193	$5.30K	0.00%
FMR LLC	178	$4.89K	0.00%
California State Teachers Retirement System	136	$3.74K	0.00%
Caitong International Asset Management Co., Ltd	75	$2.06K	0.00%
Quarry LP	75	$2.06K	0.00%

Sold out (15)

Institutions that held Assembly Biosciences, Inc. at the end of Q1 2026 and filed for Q2 2026 without it.

Institutions that sold out of ASMB in Q2 2026
Institution	Shares, Q1 2026	Value, Q1 2026
Blackstone Group Inc.	296,855	$8.24M
Adage Capital Partners GP, L.L.C.	161,000	$4.47M
Patient Square Capital LP	136,315	$3.78M
Arrowstreet Capital, Limited Partnership	39,446	$1.09M
Jane Street Group, LLC	34,499	$957.3K
Susquehanna International Group, LLP	32,949	$914.3K
683 Capital Management, LLC	27,863	$773.2K
Wellington Management Group LLP	26,496	$735.3K
Federated Hermes, Inc.	18,904	$524.6K
Hudson Bay Capital Management LP	16,799	$466.2K
Jump Financial, LLC	10,917	$302.9K
Omers Administration Corp	8,100	$224.8K
Aquatic Capital Management LLC	220	$6.11K
US Bancorp	59	$1.64K
Fifth Third Bancorp	57	$1.58K

Not filed for Q2 2026 yet (1)

Institutions that held Assembly Biosciences, Inc. at the end of Q1 2026 and haven't filed a 13F for Q2 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding ASMB in Q1 2026 that haven't filed for Q2 2026
Institution	Shares, Q1 2026	Value, Q1 2026
Janus Henderson Group PLC	849,309	$23.5M