Ultragenyx Pharmaceutical
RARE · NASDAQ
Who owns RARE
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 53.2% of RARE’s shares.
- BlackRock Institutional Trust Company, N.A.8.3%
- RTW Investments L.P.7.9%
- Vanguard Portfolio Management, LLC6.9%
- AQR Capital Management, LLC6.7%
- Next 6 largest institutions23.4%
- All other shareholders46.8%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 8.18M | 8.31% |
| RTW Investments L.P. | 7.80M | 7.92% |
| Vanguard Portfolio Management, LLC | 6.79M | 6.89% |
| AQR Capital Management, LLC | 6.56M | 6.66% |
| State Street Investment Management (US) | 6.16M | 6.25% |
| Vanguard Capital Management, LLC | 4.30M | 4.36% |
| Two Sigma Investments, LP | 3.62M | 3.68% |
| Sands Capital Management, LLC | 3.16M | 3.21% |
| Jacobs Levy Equity Management, Inc. | 2.94M | 2.98% |
| Frontier Capital Management Company, LLC | 2.85M | 2.89% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| State Street SPDR S&P Biotech ETF | 3.86M | 3.92% |
| Vanguard Total Stock Market Index Fund | 3.00M | 3.05% |
| iShares Russell 2000 ETF | 2.49M | 2.53% |
| Vanguard Small-Cap Index Fund | 2.14M | 2.18% |
| Vanguard Small-Cap Growth Index Fund | 1.24M | 1.26% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $816.52K (11 trades) of RARE on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Huizenga Theodore Alan | Sale | 1.28K | $17.41K |
| Huizenga Theodore Alan | Sale | 161 | $2.25K |
| Parschauer Karah Herdman | Sale | 1.90K | $47.35K |
| Horn Howard | Sale | 4.70K | $117.02K |
| Horn Howard | Sale | 4.70K | $155.64K |
| Sanders Corazon (Corsee) D. | Sale | 2.00K | $50.10K |
| Parschauer Karah Herdman | Sale | 1.90K | $46.75K |
| Horn Howard | Sale | 4.65K | $110.60K |
| SULIMAN SHEHNAAZ | Sale | 5.74K | $144.19K |
| Ray Amrit | Award | 14.06K | — |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Gilbert CisnerosHouse | Purchase | $1K–$15K | Sep 29, 2026 |
| Gil CisnerosHouse | Purchase | $1K–$15K | Feb 18, 2026 |
Short interest
Settled Sep 30, 2026
- Shares short
- 20.35M
- Days to cover
- 3.13
- % of shares outstanding
- 20.66%
- Average daily volume
- 6.50M
- Change since last report
- +22.8%
Information on this page is provided for informational purposes only and is not a recommendation to buy, sell or hold any security. Investing involves risk, including possible loss of principal. Market data is delayed at least 15 minutes and is provided without warranty. Analyst ratings, price targets and company data come from third-party sources. Past performance does not guarantee future results.