RARE
Ultragenyx Pharmaceutical Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers): holder breadth 0.0% · share flow +5.0% · net new positions 0.0% · formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 2 | 0 | 477.97K | $7.18M | +1 | −2 |
| Q2 2026 | 97 | -6 | 59.88M | $1.99B | +8 | −14 |
| Q1 2026 | 106 | +4 | 55.54M | $1.16B | +10 | −7 |
| Q4 2025 | 102 | 0 | 62.50M | $1.44B | +1 | n/a |
| Q3 2025 | 19 | -1 | 45.29M | $1.36B | n/a | −2 |
| Q2 2025 | 18 | -1 | 33.50M | $1.22B | n/a | −1 |
| Q1 2025 | 16 | 0 | 17.22M | $623.52M | n/a | n/a |
| Q4 2024 | 16 | +1 | 16.41M | $690.18M | +1 | n/a |
| Q3 2024 | 14 | +2 | 15.84M | $879.45M | +2 | n/a |
| Q2 2024 | 12 | n/a | 15.75M | $647.24M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | T. Rowe Price ✦ | 3.22M | +28.1% | $116.56M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 2 | State Street Global Advisors ✦ (passive) | 2.62M | -3.8% | $94.82M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 3 | Wellington Management ✦ | 2.45M | -0.3% | $88.70M | 0.0% | ▼ Trim | 4 | SEC ↗ ×6 |
| 4 | Adage Capital Partners ✦ | 2.15M | +81.6% | $77.82M | 0.1% | ▲ Add | 4 | SEC ↗ |
| 5 | Geode Capital Management ✦ (passive) | 1.65M | +5.4% | $59.64M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 6 | Norges Bank ✦ (passive) | 983.64K | +2.3% | $35.62M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 7 | Point72 Asset Management ✦ | 976.05K | -17.5% | $35.34M | 0.1% | ▼ Trim | 4 | SEC ↗ |
| 8 | Millennium Management ✦ | 712.39K | +2.2% | $25.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 9 | Two Sigma Investments ✦ | 633.15K | +3.0% | $22.93M | 0.1% | ▲ Add | 4 | SEC ↗ |
| 10 | D. E. Shaw & Co. ✦ | 556.42K | +94.5% | $20.15M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 11 | Marshall Wace ✦ | 334.08K | -68.2% | $12.10M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 12 | Renaissance Technologies ✦ | 299.60K | +17.6% | $10.85M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 13 | Citadel Advisors ✦ | 256.55K | -10.3% | $9.29M | 0.0% | ▼ Trim | 4 | SEC ↗ ×2 |
| 14 | Fisher Asset Management ✦ | 207.75K | -21.7% | $7.52M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 15 | AQR Capital Management ✦ | 92.05K | -67.2% | $3.31M | 0.0% | ▼ Trim | 4 | SEC ↗ ×3 |
| 16 | Duquesne Family Office ✦ | 85.44K | 0.0% | $3.09M | 0.1% | Held | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 293 holders, 97.86M shares, $1.96B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold: shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 7.07K sh · $107,898
Officer · 1.28K sh · $17,410
Officer · 161 sh · $2,252
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology