Security record · archived quarter
AMBA
Ambarella, Inc. · Technology · Semiconductors
16Tracked holders
-2Δ holders
14.28MShares held
$943.54MReported value
+0New positions
−2Exits
Momentum inputs (comparable managers):
holder breadth -11.1% ·
share flow -1.6% ·
net new positions -12.5%
— formula
Broad distribution — falling shares and fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 105 | +2 | 24.18M | $2.13B | +10 | −8 |
| 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 | — | — |
Who holds it · Q2 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 5.16M | — | $341.17M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | The Vanguard Group ✦ (passive) | 5.16M | — | $341.17M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | The Vanguard Group ✦ (passive) | 5.16M | — | $341.17M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | The Vanguard Group ✦ (passive) | 5.16M | — | $341.17M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | The Vanguard Group ✦ (passive) | 5.16M | — | $341.17M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | BlackRock ✦ (passive) | 3.92M | — | $258.83M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | State Street Global Advisors ✦ (passive) | 1.86M | +8.9% | $122.56M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 24 | Geode Capital Management ✦ (passive) | 976.28K | +3.0% | $64.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 25 | Geode Capital Management ✦ (passive) | 976.28K | +3.0% | $64.51M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 26 | Citadel Advisors ✦ | 945.66K | +33.0% | $62.48M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 27 | Renaissance Technologies ✦ | 350.85K | -1.9% | $23.18M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 28 | Baillie Gifford ✦ | 259.38K | -10.5% | $17.14M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 29 | Baillie Gifford ✦ | 259.38K | -10.5% | $17.14M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 30 | Baillie Gifford ✦ | 259.38K | -10.5% | $17.14M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 31 | Baillie Gifford ✦ | 259.38K | -10.5% | $17.14M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 32 | AQR Capital Management ✦ | 225.00K | +165.1% | $14.86M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 33 | AQR Capital Management ✦ | 225.00K | +165.1% | $14.86M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 34 | AQR Capital Management ✦ | 225.00K | +165.1% | $14.86M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 35 | AQR Capital Management ✦ | 225.00K | +165.1% | $14.86M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 36 | AQR Capital Management ✦ | 225.00K | +165.1% | $14.86M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 37 | Fidelity (FMR) ✦ | 220.75K | — | $14.58M | 0.0% | n/c | 1 | SEC ↗ |
| 38 | Fidelity (FMR) ✦ | 220.75K | — | $14.58M | 0.0% | n/c | 1 | SEC ↗ |
| 39 | Arrowstreet Capital ✦ | 112.66K | +899.6% | $7.44M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 40 | Marshall Wace ✦ | 88.32K | +1895.1% | $5.83M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 41 | Marshall Wace ✦ | 88.32K | +1895.1% | $5.83M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 42 | Marshall Wace ✦ | 88.32K | +1895.1% | $5.83M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 43 | Marshall Wace ✦ | 88.32K | +1895.1% | $5.83M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 44 | Millennium Management ✦ | 64.04K | -93.0% | $4.23M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 45 | T. Rowe Price ✦ | 33.12K | +15.2% | $2.19M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 46 | Two Sigma Investments ✦ | 30.76K | +27.3% | $2.03M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 47 | PRIMECAP Management ✦ | 21.90K | -13.4% | $1.45M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 48 | GAMCO Investors ✦ | 16.18K | -11.8% | $1.07M | 0.0% | ▼ Trim | 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
| Point72 Asset Management | $4.77M | was 0.0% |
| Gotham Asset Management | $238,967 | 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.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2025 ·
Methodology ·
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