RARE · Insider trading · 13F holders · Congress trades
Ultragenyx Pharmaceutical Inc. (RARE)
Who is buying and selling RARE: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 26
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $292K
- Congress trades, 12 months
- 3
RARE at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 3 RARE insiders filed 5 sales worth $292K on SEC Form 4, and no open-market purchases; 3 of the sales were pre-planned under Rule 10b5-1.
- 26 13F filers hold RARE among their 50 largest positions, worth $822.1M combined. The biggest bets by portfolio weight are Ishara Investments LP (5.0%), Krensavage Asset Management, LLC (5.0%) and Eagle Health Investments LP (4.9%). In their latest 13Fs, 1 manager opened a new position and 4 added to one.
- Members of Congress have disclosed 5 RARE trades since 2025, 3 purchases and 0 sales in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Sep 29, 2026.
- RARE last closed at $16.78 on Oct 29, 2026.
RARE insider trading
Between Aug 1, 2026 and Oct 29, 2026, 3 RARE insiders filed 5 sales worth $292K on SEC Form 4, and no open-market purchases; 3 of the sales were pre-planned under Rule 10b5-1.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Oct 19, 2026 | Horn Howard | Chief Financial Officer | Sale | 7,066 | $15.27 | $108K | SEC |
| Sep 15, 2026 | Huizenga Theodore Alan | SVP, Chief Accounting Officer | Sale10b5-1 | 1,283 | $13.57 | $17K | SEC |
| Sep 8, 2026 | Huizenga Theodore Alan | SVP, Chief Accounting Officer | Sale | 161 | $13.99 | $2K | SEC |
| Aug 4, 2026 | Horn Howard | Chief Financial Officer | Sale10b5-1 | 4,696 | $24.92 | $117K | SEC |
| Aug 4, 2026 | Parschauer Karah Herdman | EVP and Chief Legal Officer | Sale10b5-1 | 1,900 | $24.92 | $47K | SEC |
Who owns RARE? Hedge funds and superinvestors
26 13F filers hold RARE among their 50 largest positions, worth $822.1M combined. The biggest bets by portfolio weight are Ishara Investments LP (5.0%), Krensavage Asset Management, LLC (5.0%) and Eagle Health Investments LP (4.9%). In their latest 13Fs, 1 manager opened a new position and 4 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Rtw Investments, LPHedge fund | 2.2% | $260.3M | 7,796,895 | +113.7% shares | Q2 2026 |
| Sands Capital Management, LLCHedge fund | 0.4% | $105.5M | 3,158,368 | -1.7% shares | Q2 2026 |
| Frontier Capital Management Co LLCInstitutional asset manager | 0.9% | $95.1M | 2,847,936 | — | Q2 2026 |
| Bellevue Group AGInvestment manager | 1.4% | $66.2M | 1,982,775 | -16.7% shares | Q2 2026 |
| Sofinnova Investments, Inc.Hedge fund | 3.1% | $57.3M | 1,717,505 | -45.4% shares | Q2 2026 |
| Mpm Bioimpact LLCHedge fund | 2.9% | $47.4M | 1,418,215 | New | Q2 2026 |
| Rock Springs Capital Management LPHedge fund | 1.6% | $32.3M | 967,855 | -20.6% shares | Q2 2026 |
| Eagle Health Investments LPHedge fund | 4.9% | $29.5M | 884,121 | +0.0% shares | Q2 2026 |
| Palo Alto Investors LPHedge fund | 2.8% | $19.9M | 596,495 | +0.0% shares | Q2 2026 |
| Sphera Funds Management Ltd.Hedge fund | 2.8% | $19.6M | 588,494 | -27.3% shares | Q2 2026 |
| Krensavage Asset Management, LLCHedge fund | 5.0% | $13.1M | 390,879 | +0.0% shares | Q2 2026 |
| Privium Fund Management B.V.Asset manager | 2.1% | $11.3M | 338,800 | -7.1% shares | Q2 2026 |
| Catalio Capital Management, LPHedge fund | 2.0% | $10.6M | 316,252 | -62.8% shares | Q2 2026 |
| GordonMD Global Investments LPHedge fund | 4.7% | $9.7M | 289,101 | +0.0% shares | Q2 2026 |
| Ishara Investments LPHedge fund | 5.0% | $6.8M | 205,000 | +17.6% shares | Q2 2026 |
| Blue Owl Capital Holdings LPHedge fund | 0.9% | $6.1M | 182,638 | -39.7% shares | Q2 2026 |
| Atom Investors LPHedge fund | 0.5% | $5.7M | 171,771 | — | Q2 2026 |
| Ikarian Capital, LLCHedge fund | 0.9% | $5.5M | 165,617 | -65.7% shares | Q2 2026 |
| SR One Capital Management, LPHedge fund | 0.4% | $4.6M | 137,753 | +0.0% shares | Q2 2026 |
| B Group, Inc.Hedge fund | 2.6% | $4.5M | 135,000 | +0.0% shares | Q2 2026 |
| Odyssean, LLCAsset manager | 0.7% | $4.1M | 122,087 | +81.1% shares | Q2 2026 |
| BIT Capital GmbHAsset manager | 0.1% | $3.1M | 91,391 | — | Q2 2026 |
| Knott David M JrInvestment manager | 0.7% | $1.3M | 38,069 | +15.1% shares | Q2 2026 |
| Flax Pond Capital, LLCWealth manager | 1.0% | $1.2M | 57,938 | +2.3% shares | Q2 2026 |
| Stonepine Capital Management, LLCHedge fund | 0.6% | $835K | 25,000 | — | Q2 2026 |
| Pale Fire Capital SEAsset manager | 0.0% | $551K | 16,514 | +0.0% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 26). Screen RARE in the grand portfolio →
RARE stock trades by members of Congress
Members of Congress have disclosed 5 RARE trades since 2025, 3 purchases and 0 sales in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Sep 29, 2026.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Oct 12, 2026 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Sep 29, 2026 | +5.9% |
| Apr 7, 2026 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Mar 3, 2026 | -26.5% |
| Mar 9, 2026 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Feb 18, 2026 | -20.7% |
| Sep 12, 2025 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Aug 8, 2025 | -41.1% |
| Aug 14, 2025 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Jul 15, 2025 | -40.4% |
Analysis mentioning RARE
Posts from the blog that cover Ultragenyx Pharmaceutical Inc., newest first.
RARE questions and answers
Are insiders buying RARE stock?
Between Aug 1, 2026 and Oct 29, 2026, 3 RARE insiders filed 5 sales worth $292K on SEC Form 4, and no open-market purchases; 3 of the sales were pre-planned under Rule 10b5-1.
Which hedge funds own RARE?
26 13F filers hold RARE among their 50 largest positions, worth $822.1M combined. The biggest bets by portfolio weight are Ishara Investments LP (5.0%), Krensavage Asset Management, LLC (5.0%) and Eagle Health Investments LP (4.9%). In their latest 13Fs, 1 manager opened a new position and 4 added to one.
Has Congress traded RARE?
Members of Congress have disclosed 5 RARE trades since 2025, 3 purchases and 0 sales in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Sep 29, 2026.
Who is the largest holder of RARE?
Among 13F filers, Rtw Investments, LP reports the largest RARE position, $260.3M (7,796,895 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Ishara Investments LP's: 5.0% of its portfolio.
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