Latest Period
Q1 2026
Security Snapshot
ASSEMBLY BIOSCIENCES, INC. - Common Stock, par value $0.001 per shares (the "Shares") (ASMB) Institutional Ownership
CUSIP: 045396207
13F Institutional Holders and Ownership History from Q1 2024 to Q2 2026
Institutions Reporting
74
Shares (Excl. Options)
13,568,603
Price
$27.75
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- Security type / class
- Equity / Common Stock, par value $0.001 per shares (the "Shares")
- Symbol
- ASMB on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 13,568,603
- Total 13F value
- $376,381,234
- Portfolio coverage rank
- 0%
- Share change
- -167,251
- Value change
- -$6,937,135
- Number of holders
- 74
- Shares outstanding
- 15,738,333
- SEC-reported price per share
- $28.97
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
2 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ASMB - ASSEMBLY BIOSCIENCES, INC. - Common Stock, par value $0.001 per shares (the "Shares") is tracked under CUSIP 045396207.
- 74 institutions reported positions in Q1 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 74 to 5 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $376,381,234 to $5,891,932.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 74 institutions filings for Q1 2026.
Security key
045396207
Latest holder period
Q1 2026
13F holders
74
13D/G owners
6
CIK / CUSIP context first
Open Q1 2026 holders
ASMB full holder history
ASSEMBLY BIOSCIENCES, INC. SEC filings
ASSEMBLY BIOSCIENCES, INC. company facts
ASSEMBLY BIOSCIENCES, INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 045396207:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
ASMB
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Commodore Capital LP | 9.9% | $29,281,576 | 1,615,981 | Commodore Capital LP | 08 Aug 2025 | |||
| RA CAPITAL MANAGEMENT, L.P. | 9.5% | $28,392,908 | 1,530,615 | RA Capital Management, L.P. | 11 Aug 2025 | |||
| JANUS HENDERSON GROUP PLC | 8.2% | $44,444,160 | 1,341,508 | JANUS HENDERSON GROUP PLC | 28 Nov 2025 | |||
| Farallon Capital Partners, L.P. | 7.8% | +7.1% | $38,963,707 | +$2,763,919 | 1,227,590 | +7.6% | Dapice Joshua J. | 31 Dec 2025 |
| Schornstein Alexander | 3.5% | -65% | $10,082,352 | -$3,424,144 | 543,523 | -25% | Alexander Schornstein | 11 Aug 2025 |
| ARMISTICE CAPITAL, LLC | 10% | $5,252,553 | 289,876 | Armistice Capital, LLC | 30 Jun 2025 |
As of 31 Mar 2026, 74 institutional investors reported holding 13,568,603 shares of ASSEMBLY BIOSCIENCES, INC. - Common Stock, par value $0.001 per shares (the "Shares") (ASMB). This represents 86% of the company’s total 15,738,333 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
81%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| GILEAD SCIENCES, INC. | 29% | 4,505,391 | 0% | 5.9% | $125,024,600 |
| FARALLON CAPITAL MANAGEMENT LLC | 7.8% | 1,227,590 | 0% | 0.22% | $34,065,623 |
| RA CAPITAL MANAGEMENT, L.P. | 6.5% | 1,020,410 | 0% | 0.3% | $28,316,378 |
| Commodore Capital LP | 6.4% | 1,000,000 | 0% | 1.6% | $27,750,000 |
| JANUS HENDERSON GROUP PLC | 5.4% | 849,309 | +1.4% | 0.01% | $23,479,147 |
| Paradigm Biocapital Advisors LP | 4.2% | 665,251 | 0% | 0.38% | $18,460,715 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.1% | 490,447 | 0% | 0% | $13,609,904 |
| Parkman Healthcare Partners LLC | 2.6% | 411,227 | +65% | 1.2% | $11,411,549 |
| Point72 Asset Management, L.P. | 2.2% | 344,105 | -43% | 0.02% | $9,548,914 |
| Blackstone Inc. | 1.9% | 296,855 | -6.9% | 0.03% | $8,237,726 |
| MILLENNIUM MANAGEMENT LLC | 1.5% | 233,650 | +138% | 0% | $6,483,788 |
| BlackRock, Inc. | 1.3% | 202,743 | +5.4% | 0% | $5,626,119 |
| STEMPOINT CAPITAL LP | 1.2% | 185,435 | +18% | 0.99% | $5,145,821 |
| B Group, Inc. | 1.1% | 175,706 | 0% | 3.6% | $4,875,842 |
| MARSHALL WACE, LLP | 1% | 163,400 | +27% | 0% | $4,534,349 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 1% | 161,000 | 0% | 0.01% | $4,467,750 |
| Patient Square Capital LP | 0.87% | 136,315 | +7.3% | 0.67% | $3,782,741 |
| GEODE CAPITAL MANAGEMENT, LLC | 0.84% | 132,971 | +1.3% | 0% | $3,691,627 |
| Schonfeld Strategic Advisors LLC | 0.77% | 120,500 | +122% | 0.03% | $3,343,873 |
| Caption Management, LLC | 0.52% | 81,841 | -23% | 0.11% | $2,271,088 |
| HighVista Strategies LLC | 0.47% | 74,735 | 0.57% | $2,073,896 | |
| VANGUARD FIDUCIARY TRUST CO | 0.45% | 71,606 | 0% | 0% | $1,987,067 |
| Qube Research & Technologies Ltd | 0.44% | 69,256 | +64% | 0% | $1,921,854 |
| STATE STREET CORP | 0.36% | 56,689 | +7% | 0% | $1,573,120 |
| Seven Fleet Capital Management LP | 0.36% | 56,147 | -24% | 0.49% | $1,558,080 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
10
Latest
Q1 2026
Rows shown
1-10 of 10
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 214,408 | $5,891,932 | +$5,890,421 | $27.48 | 5 |
| 2026 Q1 | 13,568,603 | $376,381,234 | -$6,937,135 | $27.75 | 74 |
| 2025 Q4 | 13,724,214 | $466,681,283 | +$45,981,788 | $34.01 | 69 |
| 2025 Q3 | 12,244,439 | $313,500,808 | +$233,088,276 | $25.60 | 56 |
| 2025 Q2 | 3,148,479 | $57,049,319 | +$415,033 | $18.12 | 33 |
| 2025 Q1 | 3,175,639 | $30,358,304 | -$551,384 | $9.56 | 36 |
| 2024 Q4 | 3,185,761 | $50,270,587 | -$3,179,725 | $15.78 | 35 |
| 2024 Q3 | 1,026,987 | $15,540,749 | -$2,242,995 | $15.14 | 30 |
| 2024 Q2 | 1,175,256 | $16,110,171 | +$7,242,756 | $13.72 | 27 |
| 2024 Q1 | 647,283 | $8,609,474 | +$8,609,474 | $13.30 | 24 |