Ultragenyx
Ownership
Ownership Structure
Who owns Ultragenyx (RARE)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 81.6% of the shares are freely tradable; institutional investors hold 104.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 7.40 | 7,299,598 | +10.1 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.46 | 5,385,992 | +0.0 | 03/31/2026 |
| State Street Corp | 5.09 | 5,021,441 | +16.7 | 03/31/2026 |
| AQR Capital Management LLC | 4.64 | 4,578,024 | +236.5 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.25 | 4,189,831 | +0.0 | 03/31/2026 |
| RTW INVESTMENTS, LLC | 3.70 | 3,648,795 | +21.6 | 03/31/2026 |
| Two Sigma Investments LLC | 3.67 | 3,621,200 | +64.2 | 06/30/2026 |
| Sands Capital Management, LLC | 3.20 | 3,158,368 | -1.7 | 06/30/2026 |
| Sofinnova Ventures | 3.19 | 3,145,888 | +3,676.6 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| State Street® SPDR® S&P® Biotech ETF | 3.91 | 3,859,478 | -1.1 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Horn Howard | Chief Financial Officer | 96,295 | 1,396,278 $ | Aug 3, 2026 | direct |
| Parschauer Karah Herdman | EVP and Chief Legal Officer | 92,562 | 1,342,149 $ | Aug 3, 2026 | direct |
| Huizenga Theodore Alan | SVP, Chief Accounting Officer | 67,863 | 984,014 $ | Sep 15, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 15, 2026 | Huizenga Theodore Alan | SVP, Chief Accounting Officer | Sell | 1,283 | 13.57 | 17,410 |
| Sep 3, 2026 | Huizenga Theodore Alan | SVP, Chief Accounting Officer | Sell | 161 | 13.99 | 2,252 |
| Aug 3, 2026 | Parschauer Karah Herdman | EVP and Chief Legal Officer | Sell | 1,900 | 24.92 | 47,348 |
| Aug 3, 2026 | Horn Howard | Chief Financial Officer | Sell | 4,696 | 24.92 | 117,024 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
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.