BAND
Bandwidth Inc. · Technology · Software - Infrastructure
Momentum inputs (comparable managers):
holder breadth -6.7% ·
share flow +3.8% ·
net new positions -7.1%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 97 | +26 | 19.72M | $1.24B | +32 | −6 |
| Q1 2026 | 73 | +2 | 16.12M | $286.88M | +5 | −3 |
| Q4 2025 | 71 | +1 | 15.74M | $243.20M | +1 | — |
| Q3 2025 | 15 | -2 | 9.73M | $162.19M | — | −2 |
| Q2 2025 | 14 | -1 | 8.93M | $142.00M | — | −1 |
| Q1 2025 | 12 | +1 | 3.45M | $45.26M | +2 | −1 |
| Q4 2024 | 11 | 0 | 3.03M | $51.59M | +1 | −1 |
| Q3 2024 | 10 | -2 | 2.28M | $39.91M | — | −2 |
| Q2 2024 | 12 | — | 2.59M | $43.78M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 2.89M | — | $45.91M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | The Vanguard Group ✦ (passive) | 1.92M | — | $30.55M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | The Vanguard Group ✦ (passive) | 1.92M | — | $30.55M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | The Vanguard Group ✦ (passive) | 1.92M | — | $30.55M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | The Vanguard Group ✦ (passive) | 1.92M | — | $30.55M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | Renaissance Technologies ✦ | 717.60K | +2.1% | $11.41M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 18 | Geode Capital Management ✦ (passive) | 648.76K | +8.8% | $10.32M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 19 | Geode Capital Management ✦ (passive) | 648.76K | +8.8% | $10.32M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 20 | State Street Global Advisors ✦ (passive) | 602.86K | 0.0% | $9.59M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 21 | AQR Capital Management ✦ | 587.30K | +49.1% | $9.34M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 22 | AQR Capital Management ✦ | 587.30K | +49.1% | $9.34M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 23 | AQR Capital Management ✦ | 587.30K | +49.1% | $9.34M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 24 | AQR Capital Management ✦ | 587.30K | +49.1% | $9.34M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 25 | AQR Capital Management ✦ | 587.30K | +49.1% | $9.34M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 26 | D. E. Shaw & Co. ✦ | 466.01K | -2.7% | $7.41M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 27 | D. E. Shaw & Co. ✦ | 466.01K | -2.7% | $7.41M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 28 | Arrowstreet Capital ✦ | 373.15K | +26.6% | $5.93M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 29 | Fidelity (FMR) ✦ | 342.65K | — | $5.45M | 0.0% | n/c | 1 | SEC ↗ |
| 30 | Fidelity (FMR) ✦ | 342.65K | — | $5.45M | 0.0% | n/c | 1 | SEC ↗ |
| 31 | Wellington Management ✦ | 146.86K | +61.3% | $2.34M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 32 | Wellington Management ✦ | 146.86K | +61.3% | $2.34M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 33 | Wellington Management ✦ | 146.86K | +61.3% | $2.34M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 34 | Wellington Management ✦ | 146.86K | +61.3% | $2.34M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 35 | Wellington Management ✦ | 146.86K | +61.3% | $2.34M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 36 | Wellington Management ✦ | 146.86K | +61.3% | $2.34M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 37 | Two Sigma Investments ✦ | 93.89K | +711.0% | $1.49M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 38 | Millennium Management ✦ | 89.07K | -4.4% | $1.42M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 39 | Citadel Advisors ✦ | 27.31K | -80.8% | $434,165 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 40 | Citadel Advisors ✦ | 27.31K | -80.8% | $434,165 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 41 | T. Rowe Price ✦ | 26.96K | +28.4% | $429,000 | 0.0% | ▲ Add | 5 | 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
| Marshall Wace | $343,536 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 155 holders, 23.91M shares, $398.44M 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)
Director · 3.80K sh · $201,529
Director · 200 sh · $10,833
Officer · 3.17K sh · $160,087
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology