ASMB · Assembly Biosciences, Inc. · Shareholders & Ownership

$21.19 +1.03 (+5.11%)

Russell 2000 member Rebalance outlook locked

Market Cap

$434.70M

20.36M

Volume · Oct 20 222.8K Avg daily vol (3M) 282.77K

Every disclosed holder of ASMB in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns ASMB

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	94	18,750,747	92.09%	Yes
Insiders (Forms 3, 4, 5)	8	1,068,071	5.25%	Yes
13D/G-only blocks	2	1,430,386	7.03%	Yes
Remaining	—	888,608	-4.36%	Negative
Registered funds (N-PORT, not summed)	73	1,605,127	7.88%	No

Shares outstanding: 20,360,596, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of ASMB

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	GILEAD SCIENCES, INC. 13F CIK 882095 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	4,977,089	24.44%	+471,698	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	GILEAD SCIENCES, INC. Insider CIK 882095 · May 26, 2026 10% Owner, issuer-wide, not summed	4,977,089	24.44%	+471,698	May 26, 2026	10% Owner, issuer-wide, not summed
2	FARALLON CAPITAL MANAGEMENT LLC 13F CIK 909661 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,604,590	7.88%	+377,000	Jun 30, 2026	carried, not yet filed for the newest quarter
2.1	FARALLON CAPITAL MANAGEMENT LLC 13G CIK 909661 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	1,604,590	7.88%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
3	Paradigm Biocapital Advisors LP 13F CIK 1855655 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,553,748	7.63%	+888,497	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	Paradigm Biocapital Advisors LP 13G CIK 1855655 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(c), passive investor, not summed	1,553,748	7.63%	+688,497	Jun 30, 2026	Rule 13d-1(c), passive investor, not summed
4	Commodore Capital LP 13F CIK 1831942 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,415,000	6.95%	+415,000	Jun 30, 2026	carried, not yet filed for the newest quarter
5	Dapice Joshua J. 13G CIK 1175707 · Unknown · Aug 8, 2025 Rule 13d-1(c), passive investor	1,140,510	5.60%	—	Aug 8, 2025	Rule 13d-1(c), passive investor
6	RA CAPITAL MANAGEMENT, L.P. 13F CIK 1346824 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,020,410	5.01%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
7	Jupiter Topco LLC 13F CIK 2146052 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	849,309	4.17%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
7.1	JANUS HENDERSON GROUP PLC 13G CIK 1274173 · Investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	1,359,514	6.68%	+18,006	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
8	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	766,819	3.77%	+564,076	Jun 30, 2026	carried, not yet filed for the newest quarter
8.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	244,994	1.20%	—	Jun 30, 2026	iShares Trust, not summed
8.2	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	89,271	0.44%	—	Jun 30, 2026	iShares Trust, not summed
8.3	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	33,135	0.16%	+9,942	Jun 30, 2026	iShares Trust, not summed
8.4	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	18,425	0.09%	—	Jun 30, 2026	Quantitative Master Series LLC, not summed
8.5	Diversified Equity Alpha Master Portfolio Fund S000004282 · Registered fund · Jun 30, 2026 Master Investment Portfolio, not summed	3,547	0.02%	—	Jun 30, 2026	Master Investment Portfolio, not summed
9	Parkman Healthcare Partners LLC 13F CIK 1777015 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	721,181	3.54%	+309,954	Jun 30, 2026	carried, not yet filed for the newest quarter
10	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	558,942	2.75%	+68,495	Jun 30, 2026	carried, not yet filed for the newest quarter
11	Alexander Schornstein 13G CIK 1999256 · Unknown · Aug 11, 2025 not summed	543,523	2.67%	-184,590	Aug 11, 2025	not summed
11.1	Schornstein Alexander Insider CIK 1999256 · Nov 25, 2024 10% Owner, issuer-wide	728,113	3.58%	+25,000	Nov 25, 2024	10% Owner, issuer-wide
12	Point72 Asset Management, L.P. 13F CIK 1603466 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	460,593	2.26%	+116,488	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Seven Fleet Capital Management LP 13F CIK 2092021 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	433,147	2.13%	+377,000	Jun 30, 2026	carried, not yet filed for the newest quarter
14	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	413,284	2.03%	+65,400	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
15	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	298,807	1.47%	+65,157	Jun 30, 2026	carried, not yet filed for the newest quarter
16	ARMISTICE CAPITAL, LLC 13G CIK 1601086 · Registered investment adviser · Jun 30, 2025 Rule 13d-1(b), qualified institution	289,876	1.42%	-26,208	Jun 30, 2025	Rule 13d-1(b), qualified institution
17	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	280,424	1.38%	+147,453	Jun 30, 2026	carried, not yet filed for the newest quarter
18	Schonfeld Strategic Advisors LLC 13F CIK 1665241 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	242,153	1.19%	+121,653	Jun 30, 2026	carried, not yet filed for the newest quarter
19	AMERIPRISE FINANCIAL INC 13F CIK 820027 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	230,000	1.13%	+230,000	Jun 30, 2026	carried, not yet filed for the newest quarter
20	DV EQUITIES, LLC 13F CIK 1841659 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	226,415	1.11%	—	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Aberdeen Group plc 13F CIK 1716774 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	207,047	1.02%	+207,047	Jun 30, 2026	carried, not yet filed for the newest quarter
22	Affinity Asset Advisors, LLC 13F CIK 1773195 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	190,000	0.93%	+190,000	Jun 30, 2026	carried, not yet filed for the newest quarter
23	B Group, Inc. 13F CIK 2043476 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	175,706	0.86%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
24	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	171,931	0.84%	+115,242	Jun 30, 2026	carried, not yet filed for the newest quarter
24.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	1,100	0.01%	—	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
24.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	249	0.00%	—	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
25	STEMPOINT CAPITAL LP 13F CIK 1952142 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	170,378	0.84%	-15,057	Jun 30, 2026	carried, not yet filed for the newest quarter
26	Okazaki Jason A Insider CIK 1807214 · Mar 29, 2026 Director, CEO and President, issuer-wide	163,354	0.80%	+51,438	Mar 29, 2026	Director, CEO and President, issuer-wide
27	Squadron Capital Management LLC 13F CIK 2050709 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	160,000	0.79%	+160,000	Jun 30, 2026	carried, not yet filed for the newest quarter
28	Woodline Partners LP 13F CIK 1784547 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	150,780	0.74%	+150,780	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Driehaus Capital Management LLC 13F CIK 938206 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	150,000	0.74%	+150,000	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Ally Bridge Group (NY) LLC 13F CIK 1822947 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	140,000	0.69%	+140,000	Jun 30, 2026	carried, not yet filed for the newest quarter
31	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	137,833	0.68%	+101,628	Jun 30, 2026	carried, not yet filed for the newest quarter
31.1	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	4,810	0.02%	+1,329	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
32	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	133,292	0.65%	+3,257	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
33	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	123,029	0.60%	+82,015	Jun 30, 2026	carried, not yet filed for the newest quarter
33.1	Small Cap Value Fund Fund S000001246 · Registered fund · Jun 30, 2026 Northern Funds, not summed	20,728	0.10%	—	Jun 30, 2026	Northern Funds, not summed
33.2	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	5,076	0.02%	—	Jun 30, 2026	Northern Funds, not summed
33.3	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	4,808	0.02%	-158	Jun 30, 2026	Northern Funds, not summed
34	FRANKLIN RESOURCES INC 13F CIK 38777 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	113,200	0.56%	+113,200	Jun 30, 2026	carried, not yet filed for the newest quarter
34.1	Franklin Biotechnology Discovery Fund Fund S000006882 · Registered fund · Jul 31, 2026 Franklin Strategic Series, not summed	40,982	0.20%	—	Jul 31, 2026	Franklin Strategic Series, not summed
35	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	95,907	0.47%	+70,470	Jun 30, 2026	carried, not yet filed for the newest quarter
36	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	91,153	0.45%	+73,430	Jun 30, 2026	carried, not yet filed for the newest quarter
37	abrdn Life Sciences Investors Fund · Registered fund · Jun 30, 2026 abrdn Life Sciences Investors, not summed	77,339	0.38%	—	Jun 30, 2026	abrdn Life Sciences Investors, not summed
37.1	abrdn Healthcare Investors Fund · Registered fund · Jun 30, 2026 abrdn Healthcare Investors, not summed	129,708	0.64%	—	Jun 30, 2026	abrdn Healthcare Investors, not summed
38	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	73,970	0.36%	+2,364	Jun 30, 2026	carried, not yet filed for the newest quarter
39	HighVista Strategies LLC 13F CIK 1335325 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	73,405	0.36%	-1,330	Jun 30, 2026	carried, not yet filed for the newest quarter
40	Delaney William E IV Insider CIK 1812734 · Mar 29, 2026 Chief Scientific Officer, issuer-wide	60,330	0.30%	+14,688	Mar 29, 2026	Chief Scientific Officer, issuer-wide
41	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	51,488	0.25%	-17,768	Jun 30, 2026	carried, not yet filed for the newest quarter
42	MONIMUS CAPITAL MANAGEMENT, LP 13F CIK 1848831 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	47,580	0.23%	-810	Jun 30, 2026	carried, not yet filed for the newest quarter
43	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	46,385	0.23%	-7,577	Jun 30, 2026	carried, not yet filed for the newest quarter
44	Trexquant Investment LP 13F CIK 1633445 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	45,661	0.22%	+22,920	Jun 30, 2026	carried, not yet filed for the newest quarter
45	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	45,219	0.22%	+12,164	Jun 30, 2026	carried, not yet filed for the newest quarter
46	GSA CAPITAL PARTNERS LLP 13F CIK 1362033 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	42,931	0.21%	-2,118	Jun 30, 2026	carried, not yet filed for the newest quarter
47	XTX Topco Ltd 13F CIK 1828301 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	42,918	0.21%	+32,133	Jun 30, 2026	carried, not yet filed for the newest quarter
48	Gaggar Anuj Insider CIK 1999576 · Mar 29, 2026 Chief Medical Officer, issuer-wide	42,688	0.21%	+14,688	Mar 29, 2026	Chief Medical Officer, issuer-wide
49	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	41,806	0.21%	+41,442	Jun 30, 2026	carried, not yet filed for the newest quarter
50	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	39,441	0.19%	+23,790	Jun 30, 2026	carried, not yet filed for the newest quarter

2 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 144 holders

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Key facts CIK 1426800 CUSIP 045396207 13F (30d) 3 filings 3 filers Visit website Investor relations