93 institutional investment managers reported ASMB positions in their Form 13F filings for Q2 2026, holding 18,749,846 shares worth $515M in total. Gilead Sciences, Inc. reported the largest position.

Are funds buying or selling ASMB?

In Q2 2026, 32 managers opened new ASMB positions, 35 added, 17 trimmed and 15 sold out. Managers that filed in both quarters added a net 4,769,377 shares.

How current is this ASMB institutional ownership data?

It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Funds · ASMB

Who owns ASMB?

Institutional ownership of Assembly Biosciences Inc. from Form 13F, Q2 2026

93 institutional managers reported holding Assembly Biosciences Inc. (ASMB) in Form 13F filings for Q2 2026, with 18,749,846 shares worth $515M. The largest reported holder was Gilead Sciences, Inc. Managers that filed both quarters added a net 4,769,377 shares (+37.0%). 32 opened new positions and 15 sold out.

Funds holding: 93
Value held: $515M
New / sold out: 32 / 15
Net shares, same filers: +37.0%

Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Largest holders of ASMB

Fund	Value	Share of 13F holdings	Shares	Move
Gilead Sciences, Inc.	$137M	26.5%	4,977,089	Added
Farallon Capital Management, L.l.c.	$44.1M	8.6%	1,604,590	Added
Paradigm Biocapital Advisors LP	$42.7M	8.3%	1,553,748	Added
Commodore Capital LP	$38.9M	7.5%	1,415,000	Added
Ra Capital Management, L.p.	$28.0M	5.4%	1,020,410	Unchanged
Jupiter Topco LLC	$23.4M	4.5%	849,309	First report
BlackRock, Inc.	$21.1M	4.1%	766,819	Added
Parkman Healthcare Partners LLC	$19.8M	3.8%	721,181	Added
Vanguard Capital Management LLC	$15.4M	3.0%	558,942	Added
Point72 Asset Management, L.P.	$12.7M	2.5%	460,593	Added
Seven Fleet Capital Management LP	$11.9M	2.3%	433,147	Added
Millennium Management LLC	$8.2M	1.6%	298,807	Added
Geode Capital Management, LLC	$7.7M	1.5%	280,424	Added
Schonfeld Strategic Advisors LLC	$6.7M	1.3%	242,153	Added
Ameriprise Financial Inc	$6.3M	1.2%	230,000	New
DV Equities, LLC	$6.2M	1.2%	226,415	First report
Aberdeen Group plc	$5.7M	1.1%	207,047	New
Affinity Asset Advisors, LLC	$5.2M	1.0%	190,000	New
B Group, Inc.	$4.8M	0.9%	175,706	Unchanged
State Street Corp	$4.7M	0.9%	171,931	Added
Stempoint Capital LP	$4.7M	0.9%	170,378	Trimmed
Squadron Capital Management LLC	$4.4M	0.9%	160,000	New
Woodline Partners LP	$4.1M	0.8%	150,780	New
Driehaus Capital Management LLC	$4.1M	0.8%	150,000	New
Ally Bridge Group (NY) LLC	$3.8M	0.7%	140,000	New

Share of 13F holdings is each fund's shares as a share of the 18,749,846 ASMB shares all 13F filers reported, not of shares outstanding.

Biggest buyers in Q2 2026

Paradigm Biocapital Advisors LP Added+$24.4M
BlackRock, Inc. Added+$15.5M
Gilead Sciences, Inc. Added+$13.0M
Commodore Capital LP Added+$11.4M
Farallon Capital Management, L.l.c. Added+$10.4M
Seven Fleet Capital Management LP Added+$10.4M
Parkman Healthcare Partners LLC Added+$8.5M
Ameriprise Financial Inc New+$6.3M
Aberdeen Group plc New+$5.7M
Affinity Asset Advisors, LLC New+$5.2M

Biggest sellers in Q2 2026

Blackstone Inc. Sold out-$8.2M
Stempoint Capital LP Trimmed-$5.5M
Adage Capital Partners GP, L.l.c. Sold out-$4.5M
Marshall Wace, LLP Trimmed-$4.0M
Patient Square Capital LP Sold out-$3.8M
Caption Management, LLC Trimmed-$1.6M
Arrowstreet Capital, Limited Partnership Sold out-$1.1M
Jane Street Group, LLC Sold out-$957K
Susquehanna International Group, LLP Sold out-$914K
683 Capital Management, LLC Sold out-$773K

The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $167M and sold $36.0M; 35 added and 17 trimmed.

Schedule 13D and 13G filings on ASMB

Owners of more than 5% must file within days, so these can be newer than the 13F data.

2025-12-08JANUS HENDERSON GROUP PLC SCHEDULE 13G filed by Assembly Biosciences Inc.Schedule 13G
2025-08-18RA CAPITAL MANAGEMENT, L.P. SCHEDULE 13G filed by Assembly Biosciences Inc.Schedule 13G
2025-08-15Farallon Capital Partners, L.P. SCHEDULE 13G filed by Assembly Biosciences Inc.Schedule 13G

Questions about ASMB ownership

Who owns ASMB stock?: 93 institutional investment managers reported ASMB positions in their Form 13F filings for Q2 2026, holding 18,749,846 shares worth $515M in total. Gilead Sciences, Inc. reported the largest position.
Are funds buying or selling ASMB?: In Q2 2026, 32 managers opened new ASMB positions, 35 added, 17 trimmed and 15 sold out. Managers that filed in both quarters added a net 4,769,377 shares.
How current is this ASMB institutional ownership data?: It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to ASMB by CUSIP. Options are left out. ASMB news and filings · ASMB insider trades · Top funds