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ASMB · Assembly Biosciences, Inc.

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$25.11 -0.46 (-1.80%) At close · Jul 29
Market Cap
$406.37M
Shares
15.89M

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.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 77
Total Value: $376,238,087
Total Shares: 13,558,202

Institutional Ownership Trend

10 quarters

Holder Concentration

Across 74 13F filers
Top Holder
33.2%
Mar 2024 → Mar 2026 · range 30.3% – 70.2%
of institutional value
Top 5
63.5%
Mar 2024 → Mar 2026 · range 62.6% – 90.5%
of institutional value
Top 10
79.8%
Mar 2024 → Mar 2026 · range 79.8% – 96.3%
of institutional value
HHI
1,413
Mar 2024 → Mar 2026 · range 1,388 – 5,054
Broadly held
Showing 77 of 77
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mid GILEAD SCIENCES, INC. $125,024,600 33.23% 4,505,391
Large FARALLON CAPITAL MANAGEMENT LLC $34,065,622 9.05% 1,227,590
Mid RA CAPITAL MANAGEMENT, L.P. $28,316,377 7.53% 1,020,410
Mid Commodore Capital LP $27,750,000 7.38% 1,000,000
Mega JANUS HENDERSON GROUP PLC $23,568,324 6.26% 849,309
Mid Paradigm Biocapital Advisors LP $18,460,715 4.91% 665,251
Mega VANGUARD CAPITAL MANAGEMENT LLC $13,609,904 3.62% 490,447
Small Parkman Healthcare Partners LLC $11,411,549 3.03% 411,227
Large Point72 Asset Management, L.P. $9,548,913 2.54% 344,105
Large Blackstone Inc. $8,237,726 2.19% 296,855
Mega MILLENNIUM MANAGEMENT LLC $6,483,787 1.72% 233,650
Mega BlackRock, Inc. $5,626,116 1.50% 202,743
Small STEMPOINT CAPITAL LP $5,145,821 1.37% 185,435
Small B Group, Inc. $4,875,841 1.30% 175,706
Large MARSHALL WACE, LLP $4,534,350 1.21% 163,400
Large ADAGE CAPITAL PARTNERS GP, L.L.C. $4,467,750 1.19% 161,000
Small Patient Square Capital LP $3,782,741 1.01% 136,315
Mega GEODE CAPITAL MANAGEMENT, LLC $3,689,945 0.98% 132,971
Large Schonfeld Strategic Advisors LLC $3,343,875 0.89% 120,500
Large Caption Management, LLC $2,271,087 0.60% 81,841
Small HighVista Strategies LLC $2,073,896 0.55% 74,735
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,987,066 0.53% 71,606
Large Qube Research & Technologies Ltd $1,921,854 0.51% 69,256
Mega STATE STREET CORP $1,573,119 0.42% 56,689
Small Seven Fleet Capital Management LP $1,558,079 0.41% 56,147
Mega JPMORGAN CHASE & CO $1,497,445 0.40% 53,962
Small MONIMUS CAPITAL MANAGEMENT, LP $1,342,822 0.36% 48,390
Mid GSA CAPITAL PARTNERS LLP $1,250,109 0.33% 45,049
Mega NORTHERN TRUST CORP Bank $1,138,138 0.30% 41,014
Mid Eversept Partners, LP $1,134,669 0.30% 40,889
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP $1,094,626 0.29% 39,446
Mega GOLDMAN SACHS GROUP INC $1,004,688 0.27% 36,205
Mega JANE STREET GROUP, LLC $957,347 0.25% 34,499
Mega MORGAN STANLEY $917,275 0.24% 33,055
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $914,334 0.24% 32,949
Mid 683 Capital Management, LLC $773,198 0.21% 27,863
Mega BARCLAYS PLC $750,637 0.20% 27,050
Mega WELLINGTON MANAGEMENT GROUP LLP $735,263 0.20% 26,496
Mega CITADEL ADVISORS LLC $705,876 0.19% 25,437
Large Squarepoint Ops LLC $660,561 0.18% 23,804
Large Trexquant Investment LP $631,062 0.17% 22,741
Large Connor, Clark & Lunn Investment Management Ltd. $603,867 0.16% 21,761
Mega TWO SIGMA INVESTMENTS, LP $570,262 0.15% 20,550
Mid ADAR1 Capital Management, LLC $553,529 0.15% 19,947
Small Palumbo Wealth Management LLC $545,093 0.14% 19,643
Large FEDERATED HERMES, INC. $524,586 0.14% 18,904
Large Hudson Bay Capital Management LP $466,172 0.12% 16,799
Large RENAISSANCE TECHNOLOGIES LLC $434,315 0.12% 15,651
Mid Susquehanna Portfolio Strategies, LLC $391,275 0.10% 14,100
Small EntryPoint Capital, LLC $343,656 0.09% 12,384
Mid Brevan Howard Capital Management LP $308,358 0.08% 11,112
Mid Jump Financial, LLC $302,946 0.08% 10,917
Mega BANK OF AMERICA CORP /DE/ Bank $302,530 0.08% 10,902
Mid XTX Topco Ltd $299,283 0.08% 10,785
Mid Engineers Gate Manager LP $261,488 0.07% 9,423
Mega AMERICAN CENTURY COMPANIES INC $254,023 0.07% 9,154
Mega CANADA PENSION PLAN INVESTMENT BOARD Pension $235,875 0.06% 8,500
Large OMERS ADMINISTRATION Corp $224,775 0.06% 8,100
Small Virtus Investment Advisers, LLC $209,595 0.06% 7,553
Mega CITIGROUP INC $179,903 0.05% 6,483
Mega Vanguard Global Advisers, LLC $128,066 0.03% 4,615
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $115,416 0.03% 4,200
Large Police & Firemen's Retirement System of New Jersey Pension $79,884 0.02% 2,907
Mid Tower Research Capital LLC (TRC) $15,096 0.00% 544
Mega UBS Group AG $10,101 0.00% 364
Large NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO $7,215 0.00% 260
Mid Aquatic Capital Management LLC $6,105 0.00% 220
Mid Sterling Capital Management LLC $5,468 0.00% 199
Mega RHUMBLINE ADVISERS $5,272 0.00% 190
Mega BNP PARIBAS ARBITRAGE, SA $4,134 0.00% 149
Small Accent Capital Management, LLC $3,940 0.00% 142
Large OSAIC HOLDINGS, INC. $2,775 0.00% 100
Large US BANCORP \DE\ Bank $1,637 0.00% 59
Large FIFTH THIRD BANCORP Bank $1,581 0.00% 57
Mid EverSource Wealth Advisors, LLC $1,511 0.00% 55
Mid Allworth Financial LP $804 0.00% 29
Mega ROYAL BANK OF CANADA Bank $444 0.00% 16
Key facts CIK 1426800 CUSIP 045396207 13F (30d) 4 filings 4 filers Visit website Investor relations

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