RARE
Ultragenyx Pharmaceutical Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers):
holder breadth +16.7% ·
share flow +0.6% ·
net new positions +14.3%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 97 | -7 | 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 | — |
| Q3 2025 | 19 | -1 | 45.29M | $1.36B | — | −2 |
| Q2 2025 | 18 | -1 | 33.50M | $1.22B | — | −1 |
| Q1 2025 | 16 | 0 | 17.22M | $623.52M | — | — |
| Q4 2024 | 16 | +1 | 16.41M | $690.18M | +1 | — |
| Q3 2024 | 14 | +2 | 15.84M | $879.45M | +2 | — |
| Q2 2024 | 12 | — | 15.75M | $647.24M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 4.17M | -8.6% | $231.39M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 2 | Wellington Management ✦ | 4.17M | -8.6% | $231.39M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 3 | Wellington Management ✦ | 4.17M | -8.6% | $231.39M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 4 | Wellington Management ✦ | 4.17M | -8.6% | $231.39M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 5 | Wellington Management ✦ | 4.17M | -8.6% | $231.39M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 6 | Wellington Management ✦ | 4.17M | -8.6% | $231.39M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 7 | T. Rowe Price ✦ | 3.07M | +2.6% | $170.47M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 8 | T. Rowe Price ✦ | 3.07M | +2.6% | $170.47M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 9 | Geode Capital Management ✦ (passive) | 1.57M | +4.4% | $87.30M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 10 | Geode Capital Management ✦ (passive) | 1.57M | +4.4% | $87.30M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 11 | Adage Capital Partners ✦ | 1.53M | +35.6% | $84.75M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 12 | AQR Capital Management ✦ | 1.04M | +975.6% | $57.81M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 13 | AQR Capital Management ✦ | 1.04M | +975.6% | $57.81M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 14 | AQR Capital Management ✦ | 1.04M | +975.6% | $57.81M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 15 | Norges Bank ✦ (passive) | 940.63K | -6.2% | $52.25M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 16 | Marshall Wace ✦ | 822.01K | -27.4% | $45.66M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 17 | Two Sigma Investments ✦ | 755.68K | +33.0% | $41.98M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 18 | Millennium Management ✦ | 710.69K | -61.6% | $39.48M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 19 | Point72 Asset Management ✦ | 653.66K | +21.1% | $36.31M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 20 | D. E. Shaw & Co. ✦ | 261.59K | +28.6% | $14.53M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 21 | Renaissance Technologies ✦ | 182.10K | New | $10.12M | 0.0% | New | 1 | SEC ↗ |
| 22 | Duquesne Family Office ✦ | 85.44K | New | $4.75M | 0.2% | New | 1 | SEC ↗ |
| 23 | Citadel Advisors ✦ | 47.95K | -72.4% | $2.66M | 0.0% | ▼ Trim | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Renaissance Technologies | $10.12M | 0.0% |
| Duquesne Family Office | $4.75M | 0.2% |
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.