Annexon Ownership | Who Owns Annexon?
Annexon Ownership Summary
Annexon is owned by 68.33% institutional investors, 0.40% insiders, and 31.27% retail investors. Fmr is the largest institutional shareholder, holding 7.47% of ANNX shares. BB Biotech AG Ord is the top mutual fund, with 4.84% of its assets in Annexon shares.
ANNX Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Annexon | 68.33% | 0.40% | 31.27% |
| Sector | Healthcare Stocks | 42.53% | 10.81% | 46.67% |
| Industry | Biotech Stocks | 45.24% | 10.75% | 44.01% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Fmr | 11.08M | 7.47% | $33.80M |
| Blackrock | 6.59M | 5.37% | $32.28M |
| Blackrock funding, inc. /de | 7.90M | 5.33% | $24.09M |
| Alerce investment management | 7.41M | 5.29% | $37.99M |
| Bvf inc/il | 7.00M | 4.72% | $21.35M |
| Redmile group | 6.30M | 4.25% | $19.22M |
| Vanguard group | 5.84M | 3.93% | $17.80M |
| Bain capital life sciences investors | 5.25M | 3.54% | $16.01M |
| Bellevue group | 5.16M | 3.48% | $15.73M |
| Morgan stanley | 3.03M | 2.04% | $9.24M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Alerce investment management | 7.41M | 66.89% | $37.99M |
| Redmile group | 6.30M | 1.87% | $19.22M |
| Sphera funds management | 1.79M | 1.15% | $5.47M |
| Opaleye management | 2.60M | 1.12% | $7.93M |
| Bain capital life sciences investors | 5.25M | 1.06% | $16.01M |
| Bvf inc/il | 7.00M | 0.87% | $21.35M |
| Tfg asset management gp | 2.11M | 0.86% | $6.44M |
| Sirios capital management l p | 970.20K | 0.39% | $2.96M |
| Ghost tree capital | 214.50K | 0.33% | $1.05M |
| Bellevue group | 5.16M | 0.33% | $15.73M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Opaleye management | 2.60M | 1.12% | 2.60M |
| Morgan stanley | 3.03M | 0.00% | 2.20M |
| Woodline partners lp | 2.64M | 0.04% | 1.58M |
| Blackrock | 6.59M | 0.00% | 1.54M |
| Adage capital partners gp | 1.50M | 0.01% | 1.50M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Fmr | 11.08M | 0.00% | -4.61M |
| Sio capital management | - | - | -4.10M |
| Logos global management lp | - | - | -2.41M |
| Gmt capital | - | - | -1.91M |
| Pictet asset management sa | - | - | -1.64M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Opaleye management | 2.60M | 1.12% | 2.60M | $7.93M |
| Adage capital partners gp | 1.50M | 0.01% | 1.50M | $4.58M |
| J. goldman & co lp | 1.11M | 0.08% | 1.11M | $3.38M |
| Summittx capital | 241.99K | 0.03% | 241.99K | $738.07K |
| Ghost tree capital | 214.50K | 0.33% | 214.50K | $1.05M |
Sold Out
| Holder | Change |
|---|---|
| National bank of canada /fi/ | -2.00 |
| Nelson, van denburg & campbell wealth management group | -9.00 |
| Quadrant capital group | -34.00 |
| Lindbrook capital | -83.00 |
| Smartleaf asset management | -119.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 30, 2025 | 144 | 16.13% | 101,348,566 | 4.74% | 68 | 1.60% | 80 | 26.98% | 36 | 5.88% |
| Jun 30, 2025 | 129 | -15.13% | 99,605,116 | -0.16% | 67 | 1.48% | 67 | -15.19% | 34 | -17.07% |
| Mar 31, 2025 | 10 | -93.59% | 26,197,503 | -76.64% | 17 | 0.28% | 4 | -95.51% | - | -100.00% |
| Dec 31, 2024 | 155 | 6.16% | 112,163,548 | 1.74% | 80 | 1.29% | 88 | 10.00% | 38 | 2.70% |
| Sep 30, 2024 | 146 | -7.01% | 110,248,434 | 2.42% | 78 | 1.02% | 80 | -18.37% | 37 | 15.63% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| BB Biotech AG Ord | 5.16M | 4.84% | - |
| FIAM Small Cap Core CIT Cl B | 3.45M | 3.14% | 2.46M |
| Vanguard Total Stock Mkt Idx Inv | 3.11M | 2.83% | 99.45K |
| Vanguard US Total Market Shares ETF | 2.83M | 2.58% | - |
| Candriam Eqs L Biotech C USD Cap | 2.53M | 2.31% | - |
| Fidelity Growth Compy Commingled Pl O | 2.37M | 2.25% | - |
| SPDR® S&P Biotech ETF | 2.32M | 2.11% | -14.13K |
| iShares Russell 2000 ETF | 2.31M | 2.10% | - |
| Fidelity Growth Compy Commingled Pl S | 1.85M | 1.68% | -604.61K |
| Columbia Small Cap Value I A | 1.36M | 1.24% | 37.30K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Nov 20, 2025 | Satter Muneer A | - | Buy | $1.79M |
| Nov 21, 2025 | Satter Muneer A | - | Buy | $1.81M |
| Nov 17, 2025 | Satter Muneer A | - | Buy | $1.50M |
| Nov 18, 2025 | Satter Muneer A | - | Buy | $1.59M |
| Nov 19, 2025 | Satter Muneer A | - | Buy | $1.97M |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q4 | 6 | - |
| 2025 Q3 | 3 | 3 |
| 2025 Q2 | 1 | - |
| 2025 Q1 | - | 9 |
| 2024 Q4 | 2 | 1 |
ANNX Ownership FAQ
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