Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
295 institutional managers reported holding POWI for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 65%. 47 opened new positions; 46 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 8.52M | 15.25% | $436.6M | unchanged | ≤2013 |
| Vanguard Group | 7.97M | 14.26% | $408.1M | added +5.3% | ≤2013 |
| Neuberger Berman Group LLC | 3.93M | 7.04% | $201.5M | trimmed -1% | ≤2013 |
| Wellington Management | 3.36M | 6.01% | $171.9M | added +38.5% | 2013 Q4 |
| State Street | 3.08M | 5.51% | $157.7M | trimmed -9.5% | ≤2013 |
| William Blair Investment Management, LLC | 2.38M | 4.26% | $122.0M | opened | 2026 Q1 |
| Snyder Capital Management L P | 2.10M | 3.77% | $107.8M | added +1.9% | ≤2013 |
| Disciplined Growth Investors INC /MN | 1.96M | 3.51% | $100.4M | trimmed -2.1% | 2014 Q4 |
| Geode Capital | 1.67M | 3.00% | $85.8M | added +4.4% | ≤2013 |
| Morgan Stanley | 1.50M | 2.69% | $76.9M | added +1.5% | ≤2013 |
| T. Rowe Price | 1.40M | 2.50% | $71.5M | added +48% | 2013 Q4 |
| Copeland Capital Management, LLC | 1.32M | 2.37% | $67.7M | added +12.6% | 2014 Q4 |
| Capital International Investors | 1.11M | 1.99% | $57.0M | trimmed -12% | 2023 Q1 |
| Dimensional Fund Advisors | 1.06M | 1.89% | $54.2M | added +7.3% | ≤2013 |
| Nuveen | 1.05M | 1.88% | $53.7M | added +686.6% | 2016 Q4 |
| Hudson Bay Capital | 1.00M | 1.79% | $51.2M | opened | 2026 Q1 |
| Westwood Holdings Group INC | 873.0k | 1.56% | $44.7M | trimmed -15.9% | 2025 Q4 |
| Robeco Institutional Asset Management B.v. | 870.2k | 1.56% | $44.6M | added +38.7% | 2013 Q3 |
| Northern Trust | 841.6k | 1.51% | $43.1M | added +2% | ≤2013 |
| Charles Schwab Investment Management | 758.0k | 1.36% | $38.8M | added +5.5% | ≤2013 |
| UBS | 756.2k | 1.35% | $38.7M | added +91.3% | ≤2013 |
| Stephens Investment Management Group LLC | 745.2k | 1.33% | $38.2M | unchanged | ≤2013 |
| Brown Advisory INC | 686.8k | 1.23% | $35.2M | trimmed -8.3% | 2022 Q1 |
| BNP Paribas Financial Markets | 654.3k | 1.17% | $33.5M | added +6.5% | ≤2013 |
| Bank OF America CORP /DE/ | 601.5k | 1.08% | $30.8M | added +1.1% | ≤2013 |
| Boston Trust Walden CORP | 577.6k | 1.03% | $29.6M | trimmed -10.7% | ≤2013 |
| BNY Mellon | 455.1k | 0.81% | $23.3M | trimmed -4.7% | ≤2013 |
| Marshall Wace | 360.2k | 0.65% | $18.5M | trimmed -27% | 2023 Q4 |
| ASR Vermogensbeheer N.v. | 344.9k | 0.62% | $17.7M | added +1.2% | 2025 Q1 |
| Riverbridge Partners LLC | 336.1k | 0.60% | $17.2M | trimmed -6% | ≤2013 |
| Goldman Sachs | 335.7k | 0.60% | $17.2M | trimmed -23.8% | ≤2013 |
| Tributary Capital Management, LLC | 325.4k | 0.58% | $16.7M | added +7.3% | 2022 Q1 |
| Nomura Asset Management International INC. | 325.3k | 0.58% | $16.7M | trimmed -50.3% | 2024 Q4 |
| Granite Investment Partners, LLC | 324.9k | 0.58% | $16.6M | trimmed -8.5% | 2025 Q1 |
| Envestnet Asset Management INC | 293.0k | 0.52% | $15.0M | added +48% | 2013 Q3 |
| ProShare Advisors LLC | 284.0k | 0.51% | $14.5M | trimmed -14.8% | 2015 Q4 |
| Connor, Clark & Lunn Investment Management LTD. | 282.9k | 0.51% | $14.5M | added +87.3% | 2025 Q3 |
| Invesco | 280.7k | 0.50% | $14.4M | added +15.6% | ≤2013 |
| Principal Financial Group INC | 271.4k | 0.49% | $13.9M | added +2.5% | ≤2013 |
| Federated Hermes, INC. | 262.9k | 0.47% | $13.5M | trimmed -13.7% | 2019 Q3 |
| Ceredex Value Advisors LLC | 262.1k | 0.47% | $13.4M | trimmed -42.2% | 2018 Q3 |
| Deutsche Bank AG\ | 243.6k | 0.44% | $12.5M | added +46% | 2013 Q3 |
| Loomis Sayles & CO L P | 233.6k | 0.42% | $12.0M | trimmed -2.5% | 2021 Q4 |
| Crawford Investment Counsel INC | 227.9k | 0.41% | $11.7M | added +3.2% | 2015 Q3 |
| Foresight Group LTD Liability Partnership | 219.5k | 0.39% | $11.2M | unchanged | 2025 Q1 |
| SEI Investments CO | 218.4k | 0.39% | $11.2M | added +36.2% | 2014 Q2 |
| Silvercrest Asset Management Group LLC | 206.5k | 0.37% | $10.6M | trimmed -10% | 2025 Q4 |
| Public Sector Pension Investment Board | 198.6k | 0.35% | $10.2M | added +3.7% | 2025 Q4 |
| First Trust Advisors LP | 193.9k | 0.35% | $9.9M | trimmed -14.9% | ≤2013 |
| Herald Investment Management LTD | 175.0k | 0.31% | $9.0M | added +16.7% | 2019 Q2 |
Largest 50 of 295 shown; the full ranked, searchable register is at boothcheck.com/holders/POWI. 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.