Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
320 institutional managers reported holding PLAB for the quarter ended Mar 31, 2026. Together they hold about 95% of shares outstanding; the top 10 hold 57%. 67 opened new positions; 54 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 9.39M | 16.08% | $379.5M | added +6.3% | ≤2013 |
| Vanguard Group | 5.82M | 9.96% | $235.2M | added +2.6% | ≤2013 |
| Dimensional Fund Advisors | 3.96M | 6.79% | $160.2M | trimmed -2.3% | ≤2013 |
| LSV Asset Management | 2.88M | 4.94% | $116.5M | unchanged | 2020 Q2 |
| American Century Companies INC | 2.82M | 4.83% | $114.0M | added +14.6% | 2019 Q2 |
| State Street | 2.24M | 3.84% | $90.6M | unchanged | ≤2013 |
| Victory Capital Management INC | 1.94M | 3.32% | $78.4M | trimmed -9.5% | 2014 Q4 |
| Geode Capital | 1.85M | 3.18% | $75.0M | added +1.4% | ≤2013 |
| Invesco | 1.43M | 2.44% | $57.7M | trimmed -7.1% | ≤2013 |
| Vaughan Nelson Investment Management, L.p. | 1.19M | 2.03% | $47.9M | opened | 2026 Q1 |
| Morgan Stanley | 1.03M | 1.76% | $41.5M | trimmed -27.1% | ≤2013 |
| Charles Schwab Investment Management | 1.00M | 1.72% | $40.6M | trimmed -1.8% | ≤2013 |
| T. Rowe Price | 902.9k | 1.55% | $36.5M | trimmed -1.6% | ≤2013 |
| Northern Trust | 851.3k | 1.46% | $34.4M | added +2% | ≤2013 |
| Janus Henderson | 823.5k | 1.41% | $33.3M | added +32.5% | 2021 Q4 |
| Boston Partners | 785.2k | 1.34% | $31.7M | trimmed -3% | 2023 Q1 |
| Needham Investment Management LLC | 605.0k | 1.04% | $24.5M | trimmed -21.9% | ≤2013 |
| Qube Research & Technologies LTD | 548.1k | 0.94% | $22.2M | added +89.8% | 2021 Q3 |
| Polar Capital Holdings PLC | 513.5k | 0.88% | $20.8M | opened | 2026 Q1 |
| AQR Capital | 486.4k | 0.83% | $19.7M | added +24.2% | ≤2013 |
| Clark Capital Management Group, INC. | 406.1k | 0.69% | $16.4M | added +50.4% | 2025 Q4 |
| Easterly Investment Partners LLC | 403.7k | 0.69% | $16.3M | trimmed -4.5% | 2021 Q4 |
| BNY Mellon | 378.1k | 0.65% | $15.3M | trimmed -2.9% | ≤2013 |
| Royce & Associates | 373.6k | 0.64% | $15.1M | trimmed -2.8% | ≤2013 |
| Heartland Advisors INC | 370.7k | 0.64% | $15.0M | trimmed -3.8% | 2019 Q3 |
| Allianz Asset Management GmbH | 369.5k | 0.63% | $14.9M | added +213.2% | 2022 Q2 |
| Bridgeway Capital Management, LLC | 362.8k | 0.62% | $14.7M | unchanged | ≤2013 |
| Hotchkis & Wiley Capital Management LLC | 351.7k | 0.60% | $14.2M | trimmed -33.5% | 2020 Q3 |
| UBS | 341.8k | 0.58% | $13.8M | added +48.9% | ≤2013 |
| Principal Financial Group INC | 334.7k | 0.57% | $13.5M | trimmed -8.2% | ≤2013 |
| TCW Group INC | 319.5k | 0.55% | $12.9M | added +0.9% | 2025 Q2 |
| Goldman Sachs | 301.8k | 0.52% | $12.2M | trimmed -33.1% | ≤2013 |
| Nuveen | 291.5k | 0.50% | $11.8M | added +126.6% | 2019 Q2 |
| Empowered Funds, LLC | 290.1k | 0.50% | $11.7M | added +1.6% | 2023 Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 289.4k | 0.50% | $11.7M | added +1.4% | 2024 Q4 |
| Prudential Financial INC | 266.3k | 0.46% | $10.8M | added +121.4% | 2017 Q4 |
| Cambria Investment Management, L.p. | 234.4k | 0.40% | $9.5M | trimmed -2.8% | 2025 Q4 |
| Meeder Advisory Services, INC. | 220.6k | 0.38% | $8.9M | trimmed -21.6% | 2023 Q4 |
| Public Sector Pension Investment Board | 211.3k | 0.36% | $8.5M | added +3.5% | 2017 Q4 |
| Citigroup INC | 201.6k | 0.34% | $8.1M | trimmed -0.8% | ≤2013 |
| Kestrel Investment Management CORP (focused) | 200.4k | 0.34% | $8.1M | trimmed -0.7% | 2024 Q4 |
| JTC Employer Solutions Trustee LTD | 191.9k | 0.33% | $7.8M | unchanged | 2023 Q4 |
| D. E. Shaw | 191.8k | 0.33% | $7.8M | added +2.4% | ≤2013 |
| Rhumbline Advisers | 166.2k | 0.28% | $6.7M | added +1.7% | ≤2013 |
| Allspring Global Investments Holdings, LLC | 159.5k | 0.27% | $6.4M | added +828.5% | 2021 Q4 |
| Voya Investment Management LLC | 148.2k | 0.25% | $6.0M | trimmed -5% | ≤2013 |
| Legal & General Group PLC | 143.6k | 0.25% | $5.8M | trimmed -2.8% | 2014 Q3 |
| O'shaughnessy Asset Management, LLC | 135.7k | 0.23% | $5.5M | trimmed -4.8% | 2023 Q1 |
| Inspire Investing, LLC | 135.3k | 0.23% | $5.5M | added +158.1% | 2022 Q2 |
| Ameriprise Financial INC | 134.5k | 0.23% | $5.4M | trimmed -22.3% | ≤2013 |
Largest 50 of 320 shown; the full ranked, searchable register is at boothcheck.com/holders/PLAB. 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.