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 Q1 2026
Institutions Reporting
71
Shares (Excl. Options)
13,537,699
Price
$27.75
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- Type / Class
- Equity / Common Stock, par value $0.001 per shares (the "Shares")
- Symbol
- ASMB on Nasdaq
- Shares outstanding
- 15,738,333
- Price per share
- $28.42
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 13,537,699
- Total reported value
- $375,523,649
- % of total 13F portfolios
- 0%
- Share change
- -173,243
- Value change
- -$7,103,413
- Number of holders
- 71
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- ASMB - ASSEMBLY BIOSCIENCES, INC. - Common Stock, par value $0.001 per shares (the "Shares") is tracked under CUSIP 045396207.
- 71 institutions reported positions in Q1 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 69 to 71 between Q4 2025 and Q1 2026.
- Reported value moved from $466,681,283 to $375,523,649.
Why This Matters
- 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.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 71 institutions filings for Q1 2026.
Investment Quick Answers
What is CUSIP 045396207?
CUSIP 045396207 identifies ASMB - ASSEMBLY BIOSCIENCES, INC. - Common Stock, par value $0.001 per shares (the "Shares") in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q1 2026 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 045396207:
Significant Owners of ASSEMBLY BIOSCIENCES, INC. - Common Stock, par value $0.001 per shares (the "Shares") (ASMB) based on Schedule 13D/G filings
| 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, 71 institutional investors reported holding 13,537,699 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.
Top 25 Institutional Shareholders
The largest institutional shareholders of ASSEMBLY BIOSCIENCES, INC. - Common Stock, par value $0.001 per shares (the "Shares") (ASMB) together control 81% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| 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% | 1% | $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 |
Institutional Holders of ASSEMBLY BIOSCIENCES, INC. - Common Stock, par value $0.001 per shares (the "Shares") (ASMB) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 13,537,699 | $375,523,649 | -$7,103,413 | $27.75 | 71 |
| 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 |