AMBA
Ambarella, Inc. · Technology · Semiconductors
Momentum inputs (comparable managers):
holder breadth +5.3% ·
share flow -3.0% ·
net new positions +5.0%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 104 | +2 | 24.16M | $2.12B | +10 | −9 |
| Q1 2026 | 106 | +4 | 25.12M | $1.29B | +11 | −7 |
| Q4 2025 | 102 | -1 | 27.16M | $1.92B | +1 | −2 |
| Q3 2025 | 20 | +1 | 15.75M | $1.30B | +2 | −1 |
| Q2 2025 | 16 | -2 | 14.28M | $943.54M | — | −2 |
| Q1 2025 | 15 | 0 | 5.22M | $262.59M | +1 | −1 |
| Q4 2024 | 15 | +1 | 6.38M | $463.79M | +2 | −1 |
| Q3 2024 | 13 | 0 | 5.27M | $297.37M | — | — |
| Q2 2024 | 13 | — | 5.52M | $297.87M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 5.17M | +0.1% | $426.52M | 0.0% | ▲ Add | 2 | SEC ↗ ×5 |
| 2 | BlackRock ✦ (passive) | 3.92M | +0.1% | $323.66M | 0.0% | ▲ Add | 2 | SEC ↗ ×17 |
| 3 | State Street Global Advisors ✦ (passive) | 1.68M | -9.4% | $138.70M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 985.02K | +0.9% | $81.30M | 0.0% | ▲ Add | 6 | SEC ↗ ×2 |
| 5 | Morgan Stanley ✦ | 958.51K | — | $79.10M | 0.0% | n/c | 1 | SEC ↗ ×9 |
| 6 | Goldman Sachs Group ✦ | 507.55K | — | $41.88M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 7 | JPMorgan Chase ✦ | 485.26K | — | $40.04M | 0.0% | n/c | 1 | SEC ↗ ×18 |
| 8 | Citadel Advisors ✦ | 454.99K | -51.9% | $37.55M | 0.0% | ▼ Trim | 6 | SEC ↗ ×2 |
| 9 | Arrowstreet Capital ✦ | 316.38K | +180.8% | $26.11M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 10 | Renaissance Technologies ✦ | 242.60K | -30.9% | $20.02M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 11 | Fidelity (FMR) ✦ | 241.87K | +9.6% | $19.96M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 12 | AQR Capital Management ✦ | 230.38K | +2.4% | $19.01M | 0.0% | ▲ Add | 6 | SEC ↗ ×5 |
| 13 | Marshall Wace ✦ | 220.87K | +150.1% | $18.23M | 0.0% | ▲ Add | 6 | SEC ↗ ×4 |
| 14 | Point72 Asset Management ✦ | 121.61K | New | $10.04M | 0.0% | New | 1 | SEC ↗ |
| 15 | Millennium Management ✦ | 118.82K | +85.5% | $9.81M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 16 | T. Rowe Price ✦ | 35.84K | +8.2% | $2.96M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 17 | PRIMECAP Management ✦ | 20.90K | -4.6% | $1.72M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 18 | Two Sigma Investments ✦ | 18.57K | -39.6% | $1.53M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 19 | GAMCO Investors ✦ | 15.20K | -6.0% | $1.25M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 20 | Gotham Asset Management ✦ | 2.67K | New | $220,493 | 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
| Point72 Asset Management | $10.04M | 0.0% |
| Gotham Asset Management | $220,493 | 0.0% |
Exited
| Baillie Gifford | $17.14M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 300 holders, 35.99M shares, $1.73B 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 · 250 sh · $17,690
Officer · 1.90K sh · $127,563
Officer · 3.13K sh · $202,659
Officer · 2.89K sh · $187,553
Officer · 2.01K sh · $130,243
Officer, Director · 6.09K sh · $394,555
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology