RARE Ultragenyx Pharmaceutical Inc.
Ultragenyx Pharmaceutical Inc. (RARE) Hedge Fund Activity
This view isolates hedge funds from the broader institutional ownership shown on the Institutional tab. A pension fund tracking an index may have no view on a stock; when a hedge fund builds or exits a position, that decision can carry information. This page measures those changes. Positions as of June 30, 2026.
Based on quarterly 13F long-equity filings. Changes compare reported quarter-end positions; filings can be reported up to 45 days later and do not represent a fund's complete exposure.
Most significant moves
Ranked by conviction, not size — how much of the fund's own book the position represents, how far it moved, and what kind of fund made it.
| Fund | Action | Shares changed | Change | Est. value | Portfolio wt. | Score |
|---|---|---|---|---|---|---|
| RTW Investments Growth Healthcare | Increased | +4.15M | +113.7% | $138.5M | 2.2% | 74 |
| Point72 Asset Management, L.P. | Sold Out | -893.3K | -100.0% | $29.8M | 0.0% | 64 |
| Balyasny Asset Management L.P. | Sold Out | -384.4K | -100.0% | $12.8M | 0.0% | 61 |
| Ghisallo Capital Management Long/Short | New | +150.0K | — | $5.0M | 0.1% | 57 |
| Tudor Investment Corporation Macro | Sold Out | -53.5K | -100.0% | $1.8M | 0.0% | 56 |
| CITADEL ADVISORS LLC Quant | Reduced | -1.90M | -90.0% | $63.6M | 0.0% | 55 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Increased | +1.10M | +229.2% | $36.7M | 0.1% | 54 |
| ADAR1 Capital Management Long/Short Growth | Sold Out | -13.4K | -100.0% | $447.4K | 0.0% | 53 |
| LMR Partners Event Quant | Sold Out | -3.5K | -100.0% | $115.2K | 0.0% | 53 |
| Walleye Capital Long/Short Quant | Increased | +215.1K | +179.7% | $7.2M | 0.1% | 48 |
Most significant buyers
By move score, not size.
- RTW Investments
- Ghisallo Capital Management
- ADAGE CAPITAL PARTNERS GP, L.L.C.
- Walleye Capital
- TWO SIGMA INVESTMENTS, LP
Most significant sellers
By move score, not size.
- Point72 Asset Management, L.P.
- Balyasny Asset Management L.P.
- Tudor Investment Corporation
- CITADEL ADVISORS LLC
- ADAR1 Capital Management
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| RTW Investments | 1 | 7.8M | 3.6M | +4.15M | +113.7% | 2.2% | Increased | 74 |
| Point72 Asset Management, L.P. | 1 | 0 | 893.3K | -893.3K | -100.0% | 0.0% | Sold Out | 64 |
| Balyasny Asset Management L.P. | 2 | 0 | 384.4K | -384.4K | -100.0% | 0.0% | Sold Out | 61 |
| Ghisallo Capital Management | 2 | 150.0K | 0 | +150.0K | — | 0.1% | New | 57 |
| Tudor Investment Corporation | 2 | 0 | 53.5K | -53.5K | -100.0% | 0.0% | Sold Out | 56 |
| CITADEL ADVISORS LLC | 1 | 210.5K | 2.1M | -1.90M | -90.0% | 0.0% | Reduced | 55 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 2 | 1.6M | 480.0K | +1.10M | +229.2% | 0.1% | Increased | 54 |
| ADAR1 Capital Management | 3 | 0 | 13.4K | -13.4K | -100.0% | 0.0% | Sold Out | 53 |
| LMR Partners | 3 | 0 | 3.5K | -3.5K | -100.0% | 0.0% | Sold Out | 53 |
| Walleye Capital | 3 | 334.9K | 119.7K | +215.1K | +179.7% | 0.1% | Increased | 48 |
| Schonfeld Strategic Advisors | 3 | 52.9K | 494.7K | -441.9K | -89.3% | 0.0% | Reduced | 47 |
| TWO SIGMA INVESTMENTS, LP | 2 | 3.6M | 2.2M | +1.42M | +64.2% | 0.1% | Increased | 46 |
| Quantbot Technologies | 4 | 1.4K | 0 | +1.4K | — | 0.0% | New | 45 |
| MILLENNIUM MANAGEMENT LLC | 2 | 760.8K | 1.8M | -1.01M | -57.1% | 0.0% | Reduced | 45 |
| Lighthouse Investment Partners | 3 | 20.8K | 10.6K | +10.2K | +96.8% | 0.0% | Increased | 44 |
| Capital Fund Management | 3 | 34.0K | 121.4K | -87.4K | -72.0% | 0.0% | Reduced | 42 |
| D. E. Shaw & Co., Inc. | 1 | 1.7M | 1.3M | +469.2K | +37.2% | 0.0% | Increased | 40 |
| Aquatic Capital Management | 4 | 16.8K | 68.2K | -51.5K | -75.4% | 0.0% | Reduced | 38 |
| WORLDQUANT MILLENNIUM ADVISORS LLC | 2 | 214.4K | 150.6K | +63.8K | +42.4% | 0.0% | Increased | 38 |
| Rock Springs Capital Management | 3 | 967.9K | 1.2M | -250.9K | -20.6% | 1.6% | Reduced | 37 |
| AQR Capital Management | 3 | 6.6M | 4.6M | +1.98M | +43.3% | 0.1% | Increased | 37 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 413.7K | 561.7K | -148.0K | -26.3% | 0.0% | Reduced | 36 |
| Y-Intercept | 4 | 78.4K | 218.4K | -140.0K | -64.1% | 0.1% | Reduced | 36 |
| Brevan Howard Capital Management | 3 | 102.8K | 215.8K | -113.1K | -52.4% | 0.1% | Reduced | 34 |
| Trexquant Investment | 3 | 556.4K | 389.5K | +166.9K | +42.9% | 0.1% | Increased | 33 |
| Squarepoint Ops LLC | 2 | 338.4K | 444.5K | -106.2K | -23.9% | 0.0% | Reduced | 32 |
| Engineers Gate | 4 | 48.6K | 89.5K | -40.9K | -45.7% | 0.0% | Reduced | 30 |
| Voloridge Investment Management | 2 | 1.2M | 1.4M | -185.3K | -13.0% | 0.2% | Reduced | 29 |
| Qube Research & Technologies Ltd | 2 | 882.2K | 914.8K | -32.5K | -3.6% | 0.0% | Reduced | 27 |
| Moore Capital Management | 3 | 128.0K | 157.1K | -29.1K | -18.5% | 0.1% | Reduced | 26 |
| Jain Global | 3 | 40.7K | 52.0K | -11.3K | -21.8% | 0.0% | Reduced | 26 |
| MARSHALL WACE, LLP | 2 | 159.9K | 157.5K | +2.4K | +1.5% | 0.0% | Increased | 26 |
| Caption Management | 3 | 130.0K | 110.0K | +20.0K | +18.2% | 0.2% | Increased | 24 |
| Quadrature Capital | 3 | 52.7K | 56.6K | -3.8K | -6.8% | 0.0% | Reduced | 23 |
| Man Group | 3 | 195.1K | 213.4K | -18.2K | -8.6% | 0.0% | Reduced | 23 |
| Capstone Investment Advisors | 3 | 16.5K | 15.8K | +660 | +4.2% | 0.0% | Increased | 23 |
| Boothbay Fund Management | 4 | 156.6K | 142.0K | +14.6K | +10.3% | 0.1% | Increased | 21 |
| Palo Alto Investors | 2 | 596.5K | 596.5K | 0 | +0.0% | 2.9% | Unchanged | 34 |
| Woodline Partners LP | 2 | 171.8K | 171.8K | 0 | +0.0% | 0.0% | Unchanged | 18 |
Every fund above opens. Subscribers can see any manager's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeHedge funds are identified from their 13F filings, which are due 45 days after quarter end and cover long U.S.-listed equity positions only. A fund's short book never appears, so a reduced position can mean a changed view or a changed hedge — the filing doesn't say which.