Assembly Biosciences ASMB Institutional Ownership

NASDAQ ASMB

$23.49 +0.01 (+0.04%)

At close: Sep 30, 2026 · 4:00 PM EDT

Institutions by Trading Activity

94 Institutions

Increased 70 74.5%

Unchanged 6 6.4%

Reduced 18 19.1%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

99.60%

▲+19.32 pp QoQ

Shares Held by Institutions

18.78Mn

of 18.85Mn outstanding

▲+57.69% QoQ

Shares Outstanding

18.85Mn

74.67K held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+20 vs prior quarter

Net Shares Added (QoQ)

+6.87Mn

accumulated since last quarter

Value of Holdings

$441.12Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Assembly Biosciences, Inc. (NASDAQ:ASMB) is held by 94 institutional investors per 13F filings through June 2026.

Collectively, these holders controlled 99.6% of Assembly Biosciences's outstanding shares in June 2026, up from 80.3% in March 2026.
Their total shares held in ASMB increased 57.69% from the prior quarter, while the number of investors in Assembly Biosciences increased 193.75% year over year.
Of these 94 holders, 70 added to their stakes in Assembly Biosciences, 18 trimmed positions, and 6 made no changes.
Institutional investors collectively held 18.78Mn shares in Assembly Biosciences as of June 2026, up by 6.87Mn shares quarter on quarter, and up 15.67Mn shares year over year.
As of June 30, 2026, Gilead Sciences, Inc. held the largest stake in Assembly Biosciences with 4.98Mn shares, accounting for 26.4% of total shares outstanding.
Leading buyers of Assembly Biosciences shares for the quarter ending June 2026 were Paradigm Biocapital Advisors LP (888.5K), Jupiter Topco LLC (849.31K), BlackRock, Inc. (564.08K), Gilead Sciences, Inc. (471.7K), Commodore Capital LP (415.0K).
The biggest sellers of Assembly Biosciences for the quarter ending June 2026 included MARSHALL WACE, LLP (145.66K), Caption Management, LLC (59.01K), Eversept Partners, LP (24.38K), Barclays Plc (20.92K), Qube Research & Technologies Ltd (17.77K).
Per Business Quant, the top 10 investors in ASMB for the quarter ending June 2026 include Gilead Sciences, Inc. (4.98Mn), FARALLON CAPITAL MANAGEMENT, L.L.C. (1.6Mn), Paradigm Biocapital Advisors LP (1.55Mn), Commodore Capital LP (1.42Mn), RA CAPITAL MANAGEMENT, L.P. (1.02Mn), Jupiter Topco LLC (849.31K), BlackRock, Inc. (766.82K), Parkman Healthcare Partners LLC (721.18K), VANGUARD CAPITAL MANAGEMENT LLC (558.94K), Point72 Asset Management, L.P. (460.59K).

Form 13F Holdings

94 Institutional Holders

Report period 30 Jun, 2026

Total shares held 18.78Mn

Of outstanding 99.60%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	Gilead Sciences, Inc.	0000882095	4,977,089	26.40%	▲471,698	+10.47%	$136.77Mn
2	FARALLON CAPITAL MANAGEMENT, L.L.C.	0000909661	1,604,590	8.51%	▲377,000	+30.71%	$44.09Mn
3	Paradigm Biocapital Advisors LP	0001855655	1,553,748	8.24%	▲888,497	+133.56%	$42.70Mn
4	Commodore Capital LP	0001831942	1,415,000	7.51%	▲415,000	+41.50%	$38.88Mn
5	RA CAPITAL MANAGEMENT, L.P.	0001346824	1,020,410	5.41%	0	0.00%	$28.04Mn
6	Jupiter Topco LLC	0002146052	849,309	4.50%	▲849,309	0.00%	$23.37Mn
7	BlackRock, Inc.	0002012383	766,819	4.07%	▲564,076	+278.22%	$21.07Mn
8	Parkman Healthcare Partners LLC	0001777015	721,181	3.83%	▲309,954	+75.37%	$19.82Mn
9	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	558,942	2.96%	▲68,495	+13.97%	$15.36Mn
10	Point72 Asset Management, L.P.	0001603466	460,593	2.44%	▲116,488	+33.85%	$12.66Mn
11	Seven Fleet Capital Management LP	0002092021	433,147	2.30%	▲377,000	+671.45%	$11.90Mn
12	MILLENNIUM MANAGEMENT LLC	0001273087	298,807	1.58%	▲65,157	+27.89%	$8.21Mn
13	GEODE CAPITAL MANAGEMENT, LLC	0001214717	280,424	1.49%	▲147,453	+110.89%	$7.71Mn
14	Schonfeld Strategic Advisors LLC	0001665241	242,153	1.28%	▲121,653	+100.96%	$6.65Mn
15	Ameriprise Financial Inc	0000820027	230,000	1.22%	▲230,000	0.00%	$6.32Mn
16	DV EQUITIES, LLC	0001841659	226,415	1.20%	▲226,415	0.00%	$6.22Mn
17	Aberdeen Group plc	0001716774	207,047	1.10%	▲207,047	0.00%	$5.69Mn
18	Affinity Asset Advisors, LLC	0001773195	190,000	1.01%	▲190,000	0.00%	$5.22Mn
19	B Group, Inc.	0002043476	175,706	0.93%	0	0.00%	$4.83Mn
20	State Street Corp	0000093751	171,931	0.91%	▲115,242	+203.29%	$4.72Mn

Showing 1 to 20 of 94 holders