Annexon Inc
Ownership
Ownership Structure
Who owns Annexon Inc (ANNX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 86.4% of the shares are freely tradable; institutional investors hold 102.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Redmile Group, LLC | 6.26 | 11,869,877 | -18.4 | 06/30/2026 |
| BlackRock Inc | 5.77 | 10,938,509 | +22.1 | 03/31/2026 |
| FMR Inc | 5.61 | 10,635,648 | +4.0 | 03/31/2026 |
| Bvf Inc | 4.59 | 8,698,173 | -4.7 | 03/31/2026 |
| State Street Corp | 3.65 | 6,919,255 | +48.7 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.14 | 5,956,589 | +0.0 | 03/31/2026 |
| Bain Capital Life Sciences Investors, LLC | 2.75 | 5,212,674 | -0.7 | 03/31/2026 |
| Bellevue Group AG | 2.72 | 5,157,290 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| State Street® SPDR® S&P® Biotech ETF | 3.47 | 6,578,625 | -1.1 | 08/31/2026 |
| Fidelity Select Biotechnology | 3.26 | 6,174,755 | +0.0 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.