Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
289 institutional managers reported holding AMBA for the quarter ended Mar 31, 2026. Together they hold about 84% of shares outstanding; the top 10 hold 45%. 52 opened new positions; 82 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 5.88M | 13.72% | $303.0M | added +7.3% | ≤2013 |
| BlackRock | 3.79M | 8.84% | $195.2M | trimmed -1% | ≤2013 |
| State Street | 1.98M | 4.61% | $101.8M | added +16.1% | ≤2013 |
| Manufacturers Life Insurance Company, THE | 1.59M | 3.70% | $81.7M | added +49.5% | 2013 Q3 |
| Millennium Management | 1.51M | 3.53% | $77.9M | added +790.5% | 2022 Q3 |
| Geode Capital | 1.03M | 2.40% | $53.0M | added +0.9% | ≤2013 |
| T. Rowe Price | 952.3k | 2.22% | $49.0M | added +10.1% | 2020 Q1 |
| Citadel Advisors | 931.9k | 2.17% | $48.0M | added +74% | 2017 Q1 |
| Legal & General Group PLC | 926.4k | 2.16% | $47.7M | added +50.9% | 2016 Q4 |
| Morgan Stanley | 724.7k | 1.69% | $37.3M | trimmed -20.5% | ≤2013 |
| Dimensional Fund Advisors | 638.6k | 1.49% | $32.9M | added +28.1% | 2016 Q2 |
| Connor, Clark & Lunn Investment Management LTD. | 600.5k | 1.40% | $30.9M | added +7.8% | 2022 Q4 |
| Exchange Traded Concepts, LLC | 571.6k | 1.33% | $29.4M | added +61.9% | 2020 Q4 |
| Mirae Asset Global Etfs Holdings LTD. | 549.0k | 1.28% | $28.3M | added +23.5% | 2018 Q1 |
| Fifthdelta LTD (focused) | 546.5k | 1.27% | $28.1M | opened | 2026 Q1 |
| Point72 | 521.2k | 1.22% | $26.8M | trimmed -32.5% | 2018 Q1 |
| AQR Capital | 495.8k | 1.16% | $25.5M | added +110.2% | 2022 Q4 |
| Nuveen | 487.8k | 1.14% | $25.1M | added +2.3% | 2019 Q2 |
| Bank OF America CORP /DE/ | 481.8k | 1.12% | $24.8M | added +7.8% | ≤2013 |
| Stephens Investment Management Group LLC | 475.1k | 1.11% | $24.5M | unchanged | 2021 Q4 |
| Squarepoint Ops LLC | 460.6k | 1.07% | $23.7M | trimmed -42% | 2023 Q1 |
| Pinnacle Associates LTD | 430.2k | 1.00% | $22.2M | added +19.8% | 2015 Q1 |
| Algert Global LLC | 409.2k | 0.95% | $21.1M | added +96.8% | 2023 Q2 |
| BNP Paribas Financial Markets | 399.7k | 0.93% | $20.6M | trimmed -26% | 2014 Q1 |
| UBS | 397.1k | 0.93% | $20.5M | trimmed -44.6% | ≤2013 |
| Handelsbanken Fonder AB | 396.7k | 0.93% | $20.4M | added +27% | 2020 Q2 |
| Northern Trust | 374.8k | 0.87% | $19.3M | added +3% | ≤2013 |
| Jacobs Levy Equity Management, INC | 364.4k | 0.85% | $18.8M | added +14.4% | 2019 Q1 |
| Charles Schwab Investment Management | 363.3k | 0.85% | $18.7M | trimmed -0.5% | ≤2013 |
| Woodline Partners LP | 349.5k | 0.81% | $18.0M | opened | 2026 Q1 |
| FMR (Fidelity) | 302.3k | 0.70% | $15.6M | added +7.5% | 2018 Q3 |
| Oberweis Asset Management INC/ | 295.2k | 0.69% | $15.2M | trimmed -52.2% | 2024 Q3 |
| Balyasny Asset Management | 289.8k | 0.68% | $14.9M | trimmed -19.5% | 2021 Q3 |
| Hawk Ridge Capital Management LP (focused) | 276.1k | 0.64% | $14.2M | opened | 2026 Q1 |
| T. Rowe Price Investment Management, INC. | 257.8k | 0.60% | $13.3M | opened | 2026 Q1 |
| Marshall Wace | 249.5k | 0.58% | $12.9M | trimmed -21.6% | 2023 Q4 |
| D. E. Shaw | 245.2k | 0.57% | $12.6M | opened | 2026 Q1 |
| Walleye Capital LLC | 217.9k | 0.51% | $11.2M | added +2278% | 2023 Q3 |
| Goldman Sachs | 209.8k | 0.49% | $10.8M | added +1.1% | 2013 Q3 |
| Renaissance Technologies | 199.4k | 0.47% | $10.3M | opened | 2024 Q4 |
| Raymond James Financial INC | 186.3k | 0.43% | $9.6M | trimmed -1.5% | 2019 Q4 |
| Susquehanna International Group | 153.7k | 0.36% | $7.9M | trimmed -30.9% | ≤2013 |
| Freemont Capital Pte LTD | 135.8k | 0.32% | $7.0M | added +251.9% | 2025 Q1 |
| First Trust Advisors LP | 132.9k | 0.31% | $6.8M | trimmed -9.3% | 2017 Q4 |
| Westerly Capital Management, LLC (focused) | 130.0k | 0.30% | $6.7M | added +52.9% | 2023 Q2 |
| Mairs & Power INC | 117.6k | 0.27% | $6.1M | opened | 2026 Q1 |
| Robeco Institutional Asset Management B.v. | 117.1k | 0.27% | $6.0M | trimmed -32.7% | 2022 Q1 |
| Shannon River Fund Management LLC (focused) | 114.9k | 0.27% | $5.9M | trimmed -61.8% | 2025 Q4 |
| BNY Mellon | 112.2k | 0.26% | $5.8M | trimmed -3.6% | ≤2013 |
| Portolan Capital Management, LLC | 108.7k | 0.25% | $5.6M | added +100.5% | 2025 Q4 |
Largest 50 of 289 shown; the full ranked, searchable register is at boothcheck.com/holders/AMBA. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.