XBI
State Street SPDR S&P Biotech ETF · Financial Services · Asset Management
Momentum inputs (comparable managers):
holder breadth +20.0% ·
share flow -22.9% ·
net new positions +16.7%
· formula
Ownership fragmentation: more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 2 | 0 | 94.06K | $14.20M | n/a | −1 |
| Q2 2026 | 92 | +4 | 100.70M | $15.94B | +7 | −4 |
| Q1 2026 | 90 | +1 | 110.09M | $14.00B | +3 | −2 |
| Q4 2025 | 88 | +1 | 111.38M | $13.58B | +2 | −1 |
| Q3 2025 | 9 | -2 | 60.81M | $6.09B | +1 | −3 |
| Q2 2025 | 8 | 0 | 709.53K | $58.84M | +1 | −1 |
| Q1 2025 | 6 | 0 | 732.41K | $59.40M | +1 | −1 |
| Q4 2024 | 6 | +1 | 1.37M | $123.50M | +2 | −1 |
| Q3 2024 | 5 | 0 | 1.78M | $175.82M | +1 | −1 |
| Q2 2024 | 5 | n/a | 460.49K | $42.69M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Citadel Advisors ✦ | 916.40K | +59.9% | $82.53M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 2 | D. E. Shaw & Co. ✦ | 373.43K | -62.8% | $33.63M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 3 | Wellington Management ✦ | 65.25K | +24.1% | $5.88M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 4 | Marshall Wace ✦ | 7.92K | +48.8% | $713,545 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 5 | Renaissance Technologies ✦ | 5.50K | New | $495,330 | 0.0% | New | 1 | SEC ↗ |
| 6 | AQR Capital Management ✦ | 2.81K | New | $253,154 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Renaissance Technologies | $495,330 | 0.0% |
| AQR Capital Management | $253,154 | 0.0% |
Exited
| Millennium Management | $14.41M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 811 holders, 125.00M shares, $15.39B 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.