Ultragenyx
Ownership
Ownership Structure
Who owns Ultragenyx (RARE)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 75.2% of the shares are freely tradable; institutional investors hold 104.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 10.81 | 10,654,276 | +46.0 | 06/30/2026 |
| RTW INVESTMENTS, LLC | 7.91 | 7,796,895 | +113.7 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 6.89 | 6,790,135 | +26.1 | 06/30/2026 |
| AQR Capital Management LLC | 6.65 | 6,560,809 | +43.3 | 06/30/2026 |
| State Street Corp | 6.25 | 6,158,766 | +22.6 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.36 | 4,296,491 | +2.5 | 06/30/2026 |
| 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 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| State Street® SPDR® S&P® Biotech ETF | 5.20 | 5,129,215 | -1.9 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.04 | 2,998,189 | +0.1 | 09/30/2026 |
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 |
|---|---|---|---|---|---|
| Parschauer Karah Herdman | EVP and Chief Legal Officer | 92,562 | 1,490,248 $ | Aug 3, 2026 | direct |
| Horn Howard | Chief Financial Officer | 89,229 | 1,436,587 $ | Oct 15, 2026 | direct |
| Huizenga Theodore Alan | SVP, Chief Accounting Officer | 67,863 | 1,092,594 $ | 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 |
|---|---|---|---|---|---|---|
| Oct 15, 2026 | Horn Howard | Chief Financial Officer | Sell | 7,066 | 15.27 | 107,898 |
| 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: October 30, 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.