Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
465 institutional managers reported holding POWL for the quarter ended Mar 31, 2026. Together they hold about 26% of shares outstanding; the top 10 hold 13%. 95 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 | 1.41M | 3.84% | $253.4M | unchanged | ≤2013 |
| Vanguard Group | 889.2k | 2.43% | $160.2M | added +25.7% | ≤2013 |
| First Trust Advisors LP | 516.6k | 1.41% | $93.1M | trimmed -1.8% | 2023 Q1 |
| State Street | 362.4k | 0.99% | $65.3M | added +2.8% | ≤2013 |
| Dimensional Fund Advisors | 323.6k | 0.89% | $58.3M | trimmed -10.8% | ≤2013 |
| Morgan Stanley | 272.0k | 0.74% | $49.0M | added +41.1% | ≤2013 |
| Fisher Investments | 256.9k | 0.70% | $46.3M | trimmed -19% | 2025 Q1 |
| Geode Capital | 242.9k | 0.66% | $43.8M | added +1.6% | ≤2013 |
| Invesco | 241.8k | 0.66% | $43.6M | added +12.5% | ≤2013 |
| Janus Henderson | 225.0k | 0.61% | $40.5M | added +55.1% | 2023 Q3 |
| Gw&k Investment Management, LLC | 200.5k | 0.55% | $36.1M | trimmed -21.2% | 2025 Q1 |
| UBS | 171.0k | 0.47% | $30.8M | added +40.7% | ≤2013 |
| Federated Hermes, INC. | 156.8k | 0.43% | $28.2M | trimmed -15.3% | 2023 Q1 |
| Jane Street | 154.4k | 0.42% | $27.8M | added +12212.7% | 2022 Q4 |
| Voss Capital, LP (focused) | 136.0k | 0.37% | $24.5M | trimmed -61.1% | 2025 Q2 |
| Goldman Sachs | 126.5k | 0.35% | $22.8M | added +9.3% | ≤2013 |
| Jacobs Levy Equity Management, INC | 123.9k | 0.34% | $22.3M | trimmed -5.7% | 2016 Q2 |
| Northern Trust | 112.4k | 0.31% | $20.3M | trimmed -2.7% | ≤2013 |
| Rockefeller Capital Management L.p. | 99.9k | 0.27% | $18.0M | trimmed -12.3% | 2024 Q3 |
| Capital Group (American Funds) | 95.8k | 0.26% | $17.3M | added +47.6% | 2025 Q4 |
| Charles Schwab Investment Management | 93.8k | 0.26% | $16.9M | trimmed -2.8% | ≤2013 |
| Mirae Asset Global Etfs Holdings LTD. | 93.6k | 0.26% | $16.9M | trimmed -10.5% | 2018 Q3 |
| Bank OF America CORP /DE/ | 90.8k | 0.25% | $16.4M | added +324.5% | ≤2013 |
| Envestnet Asset Management INC | 88.2k | 0.24% | $15.9M | trimmed -8.8% | 2024 Q2 |
| Tidal Investments LLC | 87.6k | 0.24% | $15.8M | added +11401.7% | 2024 Q4 |
| Tema ETFs LLC | 84.7k | 0.23% | $15.3M | added +10.9% | 2024 Q4 |
| Portolan Capital Management, LLC | 75.8k | 0.21% | $13.7M | trimmed -4.2% | 2024 Q4 |
| Raymond James Financial INC | 75.8k | 0.21% | $13.7M | trimmed -32.3% | 2023 Q4 |
| T. Rowe Price | 75.3k | 0.21% | $13.6M | added +118.3% | 2024 Q1 |
| BNY Mellon | 73.3k | 0.20% | $13.2M | trimmed -2.8% | ≤2013 |
| TCW Group INC | 65.4k | 0.18% | $11.8M | added +98.2% | 2025 Q4 |
| Principal Financial Group INC | 65.1k | 0.18% | $11.7M | added +44.5% | ≤2013 |
| Vision One Management Partners, LP (focused) | 65.0k | 0.18% | $11.7M | added +5.8% | 2025 Q3 |
| Baird Financial Group, INC. | 64.3k | 0.18% | $11.6M | added +4.7% | 2024 Q2 |
| Stephens Investment Management Group LLC | 59.8k | 0.16% | $10.8M | trimmed -22.2% | 2024 Q3 |
| RPG Investment Advisory, LLC | 58.0k | 0.16% | $10.4M | trimmed -14.7% | 2024 Q4 |
| Allspring Global Investments Holdings, LLC | 52.3k | 0.14% | $9.4M | trimmed -5.3% | 2021 Q4 |
| Driehaus Capital Management LLC | 50.4k | 0.14% | $9.1M | added +87.1% | 2025 Q3 |
| BNP Paribas Financial Markets | 44.2k | 0.12% | $8.0M | added +1064.5% | 2014 Q1 |
| Public Sector Pension Investment Board | 41.3k | 0.11% | $7.4M | added +5.4% | 2018 Q3 |
| Royce & Associates | 41.2k | 0.11% | $7.4M | trimmed -33.3% | ≤2013 |
| Hodges Capital Management INC. | 40.8k | 0.11% | $7.4M | trimmed -21.2% | 2025 Q2 |
| Encompass Capital Advisors LLC | 40.0k | 0.11% | $7.2M | opened | 2026 Q1 |
| Aperture Investors, LLC | 39.5k | 0.11% | $7.1M | trimmed -48.5% | 2025 Q3 |
| Carnegie Investment Counsel | 36.4k | 0.10% | $6.6M | trimmed -11% | 2023 Q4 |
| Loomis Sayles & CO L P | 35.9k | 0.10% | $6.5M | trimmed -28.9% | 2024 Q3 |
| Renaissance Technologies | 34.7k | 0.10% | $6.3M | added +229.4% | 2015 Q3 |
| Oberweis Asset Management INC/ | 34.2k | 0.09% | $6.2M | trimmed -29.9% | 2023 Q3 |
| Winton Group | 30.4k | 0.08% | $5.5M | added +708.6% | 2023 Q2 |
| AQR Capital | 29.6k | 0.08% | $5.3M | trimmed -8.8% | 2023 Q1 |
Largest 50 of 465 shown; the full ranked, searchable register is at boothcheck.com/holders/POWL. 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.