ASMB · Assembly Biosciences, Inc. · Holdings

$29.80 -0.66 (-2.17%) At close · Sep 11

Russell 2000 member Rebalance outlook locked

Market Cap

$606.75M

20.36M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 93

Total Value: $516,044,819

Total Shares: 18,795,238

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 93 13F filers · Δ vs Mar 31, 2026

Top Holder

26.5%

−6.7 pts

Top 5

56.3%

−7.1 pts

Top 10

74.2%

−5.5 pts

HHI

1,022

Broadly held−387

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +18

Institutional value: +37.1%

Shares held: +38.5%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mid Paradigm Biocapital Advisors LP	+888,497	1,553,748
Mega BlackRock, Inc.	+564,076	766,819
Mid GILEAD SCIENCES, INC.	+471,698	4,977,089
Mid Commodore Capital LP	+415,000	1,415,000
Small Seven Fleet Capital Management LP	+377,000	433,147

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Large MARSHALL WACE, LLP	−145,665	17,735
Large Caption Management, LLC	−59,012	22,829
Mid Eversept Partners, LP	−24,379	16,510
Mega BARCLAYS PLC	−20,917	6,133
Mega Qube Research & Technologies Ltd	−17,768	51,488

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mega Jupiter Topco LLC	849,309	$23,339,011
Mega AMERIPRISE FINANCIAL INC	230,000	$6,320,400
Small DV EQUITIES, LLC	226,415	$6,221,884
Large Aberdeen Group plc	207,047	$5,689,651
Mid Affinity Asset Advisors, LLC	190,000	$5,221,200

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mega JANUS HENDERSON GROUP PLC	849,309	$23,568,324
Large Blackstone Inc.	296,855	$8,237,726
Large ADAGE CAPITAL PARTNERS GP, L.L.C.	161,000	$4,467,750
Small Patient Square Capital LP	136,315	$3,782,741
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	39,446	$1,094,626

Filter: New 33 Increased 35 Reduced 18 Sold out 15 Unchanged 7

Showing 95 of 95

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

GILEAD SCIENCES, INC.

$136,770,405

26.50%

4,977,089

FARALLON CAPITAL MANAGEMENT LLC

$44,094,133

8.54%

1,604,590

Paradigm Biocapital Advisors LP

$42,696,995

8.27%

1,553,748

Commodore Capital LP

$38,884,200

7.54%

1,415,000

RA CAPITAL MANAGEMENT, L.P.

$28,040,866

5.43%

1,020,410

Jupiter Topco LLC

$23,339,011

4.52%

849,309

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JANUS HENDERSON INVESTORS US LLC	849,309	$23,339,011	100.0%	Defined

BlackRock, Inc.

$21,072,183

4.08%

766,819

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	35,696	$980,926	4.7%	Sole
BlackRock Investment Management, LLC	29,274	$804,449	3.8%	Sole
BLACKROCK ADVISORS LLC	21,412	$588,401	2.8%	Sole
BlackRock Fund Advisors	371,787	$10,216,706	48.5%	Sole
BlackRock Institutional Trust Company, N.A.	298,928	$8,214,541	39.0%	Sole
Aperio Group, LLC	9,722	$267,160	1.3%	Sole

Parkman Healthcare Partners LLC

$19,818,053

3.84%

721,181

VANGUARD CAPITAL MANAGEMENT LLC

$15,359,726

2.98%

558,942

Point72 Asset Management, L.P.

$12,657,095

2.45%

460,593

Seven Fleet Capital Management LP

$11,902,879

2.31%

433,147

MILLENNIUM MANAGEMENT LLC

$8,211,216

1.59%

298,807

GEODE CAPITAL MANAGEMENT, LLC

$7,706,051

1.49%

280,424

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	40,461	$1,111,868	14.4%	Defined
Held directly	239,963	$6,594,183	85.6%	Defined

Schonfeld Strategic Advisors LLC

$6,654,364

1.29%

242,153

AMERIPRISE FINANCIAL INC

$6,320,400

1.22%

230,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Columbia Management Investment Advisers, LLC	230,000	$6,320,400	100.0%	Defined

DV EQUITIES, LLC

$6,221,884

1.21%

226,415

Aberdeen Group plc

$5,689,651

1.10%

207,047

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
abrdn Inc.	207,047	$5,689,651	100.0%	Defined

Affinity Asset Advisors, LLC

$5,221,200

1.01%

190,000

B Group, Inc.

$4,828,400

0.94%

175,706

STATE STREET CORP

$4,724,663

0.92%

171,931

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SSGA FUNDS MANAGEMENT, INC. joint	171,931	$4,724,663	100.0%	Defined

STEMPOINT CAPITAL LP

$4,681,987

0.91%

170,378

Squadron Capital Management LLC

$4,396,800

0.85%

160,000

Woodline Partners LP

$4,143,434

0.80%

150,780

Driehaus Capital Management LLC

$4,122,000

0.80%

150,000

Ally Bridge Group (NY) LLC

$3,847,200

0.75%

140,000

GOLDMAN SACHS GROUP INC

$3,787,650

0.73%

137,833

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	122,240	$3,359,155	88.7%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	15,593	$428,495	11.3%	Defined

NORTHERN TRUST CORP

$3,380,836

0.66%

123,029

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	121,482	$3,338,325	98.7%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	1,547	$42,511	1.3%	Other

FRANKLIN RESOURCES INC

$3,110,736

0.60%

113,200

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
FRANKLIN ADVISERS INC	113,200	$3,110,736	100.0%	Defined

CITADEL ADVISORS LLC

$2,635,524

0.51%

95,907

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	86,011	$2,363,582	89.7%	Defined
Held directly	9,896	$271,942	10.3%	Defined

VANGUARD PORTFOLIO MANAGEMENT LLC

$2,504,884

0.49%

91,153

VANGUARD FIDUCIARY TRUST CO

$2,032,695

0.39%

73,970

HighVista Strategies LLC

$2,017,169

0.39%

73,405

Qube Research & Technologies Ltd

$1,414,890

0.27%

51,488

MONIMUS CAPITAL MANAGEMENT, LP

$1,307,498

0.25%

47,580

JPMORGAN CHASE & CO

$1,274,658

0.25%

46,385

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	4,193	$115,223	9.0%	Defined
J.P. Morgan Securities LLC	41,828	$1,149,433	90.2%	Defined
J.P. Morgan Securities plc	364	$10,002	0.8%	Defined

Trexquant Investment LP

$1,254,764

0.24%

45,661

MORGAN STANLEY

$1,242,616

0.24%

45,219

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	9	$247	0.0%	Defined
MORGAN STANLEY & CO. LLC	2,640	$72,547	5.8%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	40,637	$1,116,704	89.9%	Defined
MORGAN STANLEY SMITH BARNEY LLC	1,933	$53,118	4.3%	Defined

GSA CAPITAL PARTNERS LLP

$1,179,743

0.23%

42,931

XTX Topco Ltd

$1,179,386

0.23%

42,918

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	42,918	$1,179,386	100.0%	Defined

UBS Group AG

$1,148,828

0.22%

41,806

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	20	$549	0.0%	Defined
UBS AG	41,786	$1,148,279	100.0%	Defined

RENAISSANCE TECHNOLOGIES LLC

$1,083,838

0.21%

39,441

Squarepoint Ops LLC

$940,200

0.18%

34,214

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	34,214	$940,200	100.0%	Defined

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$800,437

0.16%

29,128

BNP PARIBAS ARBITRAGE, SA

$665,098

0.13%

24,203

Bank of New York Mellon Corp

$659,930

0.13%

24,015

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	8,518	$234,074	35.5%	Defined
The Bank of New York Mellon	15,495	$425,802	64.5%	Defined
Held directly	2	$54	0.0%	Defined

Connor, Clark & Lunn Investment Management Ltd.

$653,062

0.13%

23,765

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	23,765	$653,062	100.0%	Sole

Caption Management, LLC

$627,340

0.12%

22,829

ADAR1 Capital Management, LLC

$561,883

0.11%

20,447

Palumbo Wealth Management LLC

$545,890

0.11%

19,865

CITADEL ADVISORS LLC

$508,380

0.10%

18,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	18,500	$508,380	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$502,884

0.10%

18,300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	18,300	$502,884	100.0%	Other

TWO SIGMA INVESTMENTS, LP

$490,737

0.10%

17,858

Engineers Gate Manager LP

$488,209

0.09%

17,766

MARSHALL WACE, LLP

$487,357

0.09%

17,735

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	17,735	$487,357	100.0%	Other

Nuveen, LLC

$463,724

0.09%

16,875

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Nuveen Asset Management, LLC joint	3,669	$100,824	21.7%	Defined
TEACHERS ADVISORS, LLC joint	13,206	$362,900	78.3%	Defined

Eversept Partners, LP

$453,694

0.09%

16,510

Susquehanna Portfolio Strategies, LLC

$415,744

0.08%

15,129

Virtus Investment Advisers, LLC

$391,617

0.08%

14,251

AMERICAN CENTURY COMPANIES INC

$363,807

0.07%

13,239

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	13,239	$363,807	100.0%	Defined

Invesco Ltd.

$326,021

0.06%

11,864

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Advisers, Inc. joint	1,199	$32,948	10.1%	Defined
Invesco Trust Co joint	3,929	$107,968	33.1%	Defined
Invesco Capital Management LLC	6,736	$185,105	56.8%	Defined

RHUMBLINE ADVISERS

$318,493

0.06%

11,590

Integrated Quantitative Investments LLC

$276,943

0.05%

10,078

DEUTSCHE BANK AG\

$264,220

0.05%

9,615

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS Investments UK Ltd	9,615	$264,220	100.0%	Defined

BANK OF AMERICA CORP /DE/

$262,901

0.05%

9,567

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BOFA SECURITIES, INC.	9,567	$262,901	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$239,076

0.05%

8,700

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	8,700	$239,076	100.0%	Other

CANADA PENSION PLAN INVESTMENT BOARD

$233,580

0.05%

8,500

EntryPoint Capital, LLC

$227,671

0.04%

8,285

WELLS FARGO & COMPANY/MN

$226,792

0.04%

8,253

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	8,253	$226,792	100.0%	Defined

PRICE T ROWE ASSOCIATES INC /MD/

$225,418

0.04%

8,203

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	8,203	$225,418	100.0%	Defined

Brevan Howard Capital Management LP

$213,382

0.04%

7,765

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Brevan Howard US Investment Management, LP	7,765	$213,382	100.0%	Defined

Persistent Asset Partners Ltd

$190,766

0.04%

6,942

BARCLAYS PLC

$168,533

0.03%

6,133

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	5,106	$140,312	83.3%	Defined
BARCLAYS CAPITAL INC.	1,027	$28,221	16.7%	Defined

MetLife Investment Management, LLC

$161,719

0.03%

5,885

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	5,885	$161,719	100.0%	Defined

Vanguard Global Advisers, LLC

$126,820

0.02%

4,615

CITIGROUP INC

$125,143

0.02%

4,554

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	4,554	$125,143	100.0%	Defined

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$124,182

0.02%

4,519

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	4,519	$124,182	100.0%	Defined

NEW YORK STATE COMMON RETIREMENT FUND

$115,416

0.02%

4,200

Police & Firemen's Retirement System of New Jersey

$79,884

0.02%

2,907

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Capital	2,907	$79,884	100.0%	Defined

Legal & General Group Plc

$26,325

0.01%

958

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	958	$26,325	100.0%	Defined

Ameritas Investment Partners, Inc.

$24,594

0.00%

895

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
EATON VANCE MANAGEMENT	895	$24,594	100.0%	Other

Russell Investments Group, Ltd.

$21,654

0.00%

788

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	788	$21,654	100.0%	Defined

HSBC HOLDINGS PLC

$17,104

0.00%

16,935

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
HSBC BANK PLC	16,935	$17,104	100.0%	Defined

Tower Research Capital LLC (TRC)

$14,564

0.00%

530

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	530	$14,564	100.0%	Defined

ROYAL BANK OF CANADA

$12,091

0.00%

440

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	440	$12,091	100.0%	Defined

NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO

$7,144

0.00%

260

Accent Capital Management, LLC

$5,825

0.00%

212

Sterling Capital Management LLC

$5,468

0.00%

199

Truvestments Capital LLC

$5,303

0.00%

193

FMR LLC

$4,891

0.00%

178

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	178	$4,891	100.0%	Defined

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

$3,737

0.00%

136

OSAIC HOLDINGS, INC.

$2,748

0.00%

100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	100	$2,748	100.0%	Defined

Caitong International Asset Management Co., Ltd

$2,061

0.00%

Quarry LP

$2,061

0.00%

EverSource Wealth Advisors, LLC

$1,511

0.00%

Allworth Financial LP

$274

0.00%

Key facts CIK 1426800 CUSIP 045396207 13F (30d) 50 filings 50 filers Visit website Investor relations