BAND
Bandwidth Inc. · Technology · Software - Infrastructure
Momentum inputs (comparable managers):
holder breadth +9.1% ·
share flow +14.0% ·
net new positions +8.3%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 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 | Renaissance Technologies ✦ | 703.10K | +8.0% | $9.21M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 2 | State Street Global Advisors ✦ (passive) | 602.88K | +1.4% | $7.90M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 3 | Geode Capital Management ✦ (passive) | 596.00K | +4.4% | $7.81M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 596.00K | +4.4% | $7.81M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 5 | D. E. Shaw & Co. ✦ | 478.97K | +8.4% | $6.27M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 6 | D. E. Shaw & Co. ✦ | 478.97K | +8.4% | $6.27M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 7 | AQR Capital Management ✦ | 393.91K | +303.1% | $5.16M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 8 | AQR Capital Management ✦ | 393.91K | +303.1% | $5.16M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 9 | AQR Capital Management ✦ | 393.91K | +303.1% | $5.16M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 10 | AQR Capital Management ✦ | 393.91K | +303.1% | $5.16M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 11 | AQR Capital Management ✦ | 393.91K | +303.1% | $5.16M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 12 | Arrowstreet Capital ✦ | 294.79K | +3.2% | $3.86M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 13 | Citadel Advisors ✦ | 141.99K | +40.9% | $1.86M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 14 | Citadel Advisors ✦ | 141.99K | +40.9% | $1.86M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 15 | Millennium Management ✦ | 93.18K | -31.7% | $1.22M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 16 | Wellington Management ✦ | 91.03K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 17 | Wellington Management ✦ | 91.03K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 18 | Wellington Management ✦ | 91.03K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 19 | Wellington Management ✦ | 91.03K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 20 | Wellington Management ✦ | 91.03K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 21 | Wellington Management ✦ | 91.03K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 22 | Marshall Wace ✦ | 26.22K | New | $343,536 | 0.0% | New | 1 | SEC ↗ |
| 23 | Marshall Wace ✦ | 26.22K | New | $343,536 | 0.0% | New | 1 | SEC ↗ |
| 24 | T. Rowe Price ✦ | 21.00K | +22.2% | $276,000 | 0.0% | ▲ Add | 4 | SEC ↗ |
| 25 | Two Sigma Investments ✦ | 11.58K | -89.3% | $151,659 | 0.0% | ▼ Trim | 4 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Wellington Management | $1.19M | 0.0% |
| Wellington Management | $1.19M | 0.0% |
| Wellington Management | $1.19M | 0.0% |
| Wellington Management | $1.19M | 0.0% |
| Wellington Management | $1.19M | 0.0% |
| Wellington Management | $1.19M | 0.0% |
| Marshall Wace | $343,536 | 0.0% |
| Marshall Wace | $343,536 | 0.0% |
Exited
| Baillie Gifford | $459,829 | 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