AMBA
Ambarella, Inc. · Technology · Semiconductors
Momentum inputs (comparable managers): holder breadth 0.0% · share flow -18.2% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 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 | State Street Global Advisors ✦ (passive) | 1.70M | +7.4% | $85.74M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 2 | Geode Capital Management ✦ (passive) | 947.91K | +3.6% | $47.72M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 3 | Millennium Management ✦ | 910.17K | -34.7% | $45.81M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 4 | Citadel Advisors ✦ | 711.25K | -16.2% | $35.80M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 5 | Renaissance Technologies ✦ | 357.70K | +731.9% | $18.00M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 6 | Baillie Gifford ✦ | 289.92K | -11.9% | $14.59M | 0.0% | ▼ Trim | 4 | SEC ↗ ×4 |
| 7 | Point72 Asset Management ✦ | 94.86K | -88.2% | $4.77M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 8 | AQR Capital Management ✦ | 84.87K | +126.6% | $4.27M | 0.0% | ▲ Add | 4 | SEC ↗ ×5 |
| 9 | T. Rowe Price ✦ | 28.75K | +13.3% | $1.45M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 10 | PRIMECAP Management ✦ | 25.30K | -1.9% | $1.27M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 11 | Two Sigma Investments ✦ | 24.17K | -70.4% | $1.22M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 12 | GAMCO Investors ✦ | 18.35K | -0.8% | $923,455 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 13 | Arrowstreet Capital ✦ | 11.27K | New | $567,219 | 0.0% | New | 1 | SEC ↗ |
| 14 | Gotham Asset Management ✦ | 4.75K | -67.3% | $238,967 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 15 | Marshall Wace ✦ | 4.43K | -97.8% | $222,811 | 0.0% | ▼ Trim | 4 | SEC ↗ ×3 |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Arrowstreet Capital | $567,219 | 0.0% |
Exited
| D. E. Shaw & Co. | $3.72M | 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