Assembly Biosciences Ownership | Who Owns Assembly Biosciences?
Assembly Biosciences Ownership Summary
Assembly Biosciences is owned by 46.72% institutional investors, 32.38% insiders, and 20.91% retail investors. Gilead sciences is the largest institutional shareholder, holding 40.19% of ASMB shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 2.19% of its assets in Assembly Biosciences shares.
ASMB Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Assembly Biosciences | 46.72% | 32.38% | 20.91% |
| Sector | Healthcare Stocks | 35.74% | 11.83% | 52.43% |
| Industry | Biotech Stocks | 36.05% | 11.82% | 52.13% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Gilead sciences | 4.51M | 40.19% | $125.02M |
| Farallon capital management | 1.23M | 10.95% | $34.07M |
| Ra capital management | 1.02M | 9.10% | $28.32M |
| Commodore capital lp | 1.00M | 8.92% | $27.75M |
| Janus henderson group | 849.31K | 7.58% | $23.48M |
| Vanguard group | 572.90K | 7.48% | $19.48M |
| Paradigm biocapital advisors lp | 665.25K | 5.93% | $18.46M |
| Parkman healthcare partners | 411.23K | 3.67% | $11.41M |
| Point72 asset management | 344.11K | 3.07% | $9.55M |
| Blackstone | 296.86K | 2.65% | $8.24M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Gilead sciences | 4.51M | 5.90% | $125.02M |
| B group | 175.71K | 3.61% | $4.88M |
| Commodore capital lp | 1.00M | 1.61% | $27.75M |
| Parkman healthcare partners | 411.23K | 1.18% | $11.41M |
| Stempoint capital lp | 185.44K | 1.00% | $5.15M |
| Patient square capital lp | 136.31K | 0.67% | $3.78M |
| Highvista strategies | 74.73K | 0.57% | $2.07M |
| Paradigm biocapital advisors lp | 665.25K | 0.38% | $18.46M |
| Monimus capital management, lp | 48.39K | 0.37% | $1.34M |
| Ra capital management | 1.02M | 0.30% | $28.32M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Parkman healthcare partners | 411.23K | 1.18% | 161.87K |
| Millennium management | 233.65K | 0.00% | 135.43K |
| Highvista strategies | 74.73K | 0.57% | 74.73K |
| Vanguard fiduciary trust | 71.61K | 0.00% | 71.61K |
| Vanguard group | 572.90K | 0.00% | 70.79K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Frazier life sciences management | - | - | -456.25K |
| Point72 asset management | 344.11K | 0.01% | -256.50K |
| Franklin resources | - | - | -210.53K |
| Eversept partners, lp | 40.89K | 0.06% | -118.79K |
| Superstring capital management lp | - | - | -65.27K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Highvista strategies | 74.73K | 0.57% | 74.73K | $2.07M |
| Vanguard fiduciary trust | 71.61K | 0.00% | 71.61K | $1.99M |
| Bioimpact capital | 39.66K | 0.17% | 39.66K | $1.02M |
| Wellington management group llp | 26.50K | 0.00% | 26.50K | $735.26K |
| Squarepoint ops | 23.80K | 0.00% | 23.80K | $660.56K |
Sold Out
| Holder | Change |
|---|---|
| Frazier financial advisors | -1.00 |
| Quadrant capital group | -22.00 |
| Royal bank of canada | -53.00 |
| Sbi securities | -68.00 |
| Ameriflex group | -83.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 31, 2026 | 17 | -75.36% | 5,237,283 | -61.84% | 46 | 0.15% | 10 | -77.27% | 4 | -71.43% |
| Dec 31, 2025 | 36 | -38.98% | 6,388,221 | -48.82% | 83 | 0.31% | 23 | -50.00% | 7 | 75.00% |
| Sep 30, 2025 | 43 | 26.47% | 9,347,787 | 196.88% | 122 | 7.22% | 30 | 130.77% | 4 | -50.00% |
| Jun 30, 2025 | 34 | -5.56% | 3,148,666 | -0.85% | 41 | 2.30% | 13 | -18.75% | 8 | -20.00% |
| Mar 31, 2025 | 36 | 2.86% | 3,175,639 | -0.32% | 42 | 1.81% | 16 | -23.81% | 10 | 42.86% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard Total Stock Mkt Idx Inv | 347.88K | 2.19% | - |
| Vanguard US Total Market Shares ETF | 114.78K | 1.53% | - |
| Franklin Biotechnology Discv A(acc)USD | 133.55K | 0.84% | -32.65K |
| Vanguard Institutional Extnd Mkt Idx Tr | 131.08K | 0.82% | 937.00 |
| Fidelity Extended Market Index | 59.55K | 0.37% | 458.00 |
| Bridgeway Ultra-Small Company Market | 13.75K | 0.22% | - |
| Extended Equity Market Fund E | 29.65K | 0.19% | - |
| Extended Equity Market Fund B | 29.65K | 0.19% | - |
| Blackrock Extended Mkt Fund CF | 29.65K | 0.19% | - |
| Franklin Biotechnology Discovery A | 27.88K | 0.18% | -43.56K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Jun 17, 2026 | Bjorkquist Jeanette M | PFO and PAO | Sell | $674.25 |
| Mar 30, 2026 | Bjorkquist Jeanette M | PFO and PAO | Sell | $439.84 |
| Mar 30, 2026 | Bjorkquist Jeanette M | PFO and PAO | Sell | $8.31K |
| Mar 30, 2026 | White Nicole S | Chief Manufacturing Officer | Sell | $247.41 |
| Mar 30, 2026 | White Nicole S | Chief Manufacturing Officer | Sell | $5.01K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | 1 |
| 2026 Q1 | - | 4 |
| 2025 Q3 | 3 | - |
| 2025 Q2 | - | - |
| 2025 Q1 | - | 4 |
ASMB Ownership FAQ
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