Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
492 institutional managers reported holding PRIM for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 54%. 90 opened new positions; 70 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 8.34M | 15.22% | $1.19B | added +0.5% | ≤2013 |
| Vanguard Group | 6.44M | 11.76% | $922.0M | trimmed -0.6% | ≤2013 |
| Fuller & Thaler Asset Management, INC. | 2.97M | 5.41% | $424.6M | trimmed -2.3% | 2020 Q3 |
| First Trust Advisors LP | 2.89M | 5.27% | $413.0M | added +47.4% | 2014 Q1 |
| State Street | 2.06M | 3.77% | $295.3M | added +2.6% | ≤2013 |
| Wellington Management | 1.88M | 3.43% | $269.0M | added +7.6% | 2015 Q2 |
| Geode Capital | 1.46M | 2.66% | $208.4M | added +9.9% | ≤2013 |
| Invesco | 1.40M | 2.55% | $199.9M | added +32% | ≤2013 |
| Dimensional Fund Advisors | 1.16M | 2.12% | $165.9M | trimmed -4.6% | ≤2013 |
| American Century Companies INC | 1.08M | 1.97% | $154.3M | added +1.8% | 2020 Q1 |
| Artemis Investment Management LLP | 879.6k | 1.60% | $125.9M | added +10% | 2025 Q2 |
| Congress Asset Management CO | 818.1k | 1.49% | $117.1M | unchanged | 2024 Q4 |
| Westfield Capital Management CO LP | 743.3k | 1.36% | $106.4M | trimmed -21.9% | 2024 Q4 |
| Goldman Sachs | 743.2k | 1.36% | $106.4M | added +21.4% | 2015 Q4 |
| UBS | 727.6k | 1.33% | $104.1M | trimmed -5.8% | ≤2013 |
| T. Rowe Price | 714.5k | 1.30% | $102.3M | added +33.7% | 2016 Q3 |
| FMR (Fidelity) | 706.0k | 1.29% | $101.0M | trimmed -1.1% | 2020 Q2 |
| Charles Schwab Investment Management | 683.6k | 1.25% | $97.8M | trimmed -3.8% | ≤2013 |
| AllianceBernstein | 683.4k | 1.25% | $97.8M | trimmed -15.6% | ≤2013 |
| Merewether Investment Management, LP | 674.8k | 1.23% | $96.6M | trimmed -13.7% | 2025 Q2 |
| Morgan Stanley | 555.7k | 1.01% | $79.5M | trimmed -6.2% | ≤2013 |
| Northern Trust | 516.3k | 0.94% | $73.9M | added +2.9% | ≤2013 |
| Van Berkom & Associates INC. | 462.6k | 0.84% | $66.2M | trimmed -19.2% | 2015 Q2 |
| Bruni J V & CO /CO (focused) | 437.0k | 0.80% | $62.5M | trimmed -1.3% | 2021 Q1 |
| Mirae Asset Global Etfs Holdings LTD. | 423.0k | 0.77% | $60.5M | added +8.1% | 2018 Q3 |
| Federated Hermes, INC. | 415.2k | 0.76% | $59.4M | trimmed -16.6% | 2023 Q4 |
| Millennium Management | 400.8k | 0.73% | $57.4M | added +22582.7% | 2016 Q2 |
| Value Holdings Management CO. LLC (focused) | 399.4k | 0.73% | $57.2M | trimmed -7% | 2016 Q4 |
| MFS Investment Management | 364.3k | 0.67% | $52.1M | added +15.9% | 2025 Q1 |
| Raymond James Financial INC | 346.7k | 0.63% | $49.6M | trimmed -9.8% | 2023 Q2 |
| Principal Financial Group INC | 345.6k | 0.63% | $49.5M | added +1.6% | 2023 Q3 |
| BNY Mellon | 345.1k | 0.63% | $49.4M | trimmed -3.3% | ≤2013 |
| Jacobs Levy Equity Management, INC | 330.5k | 0.60% | $47.3M | trimmed -38.6% | 2017 Q1 |
| Bank OF America CORP /DE/ | 324.9k | 0.59% | $46.5M | added +4.4% | ≤2013 |
| Hennessy Advisors INC | 312.7k | 0.57% | $44.8M | trimmed -9.5% | 2025 Q3 |
| D. E. Shaw | 311.1k | 0.57% | $44.5M | trimmed -47.4% | 2017 Q3 |
| Mackenzie Financial CORP | 307.3k | 0.56% | $44.0M | trimmed -24.5% | 2023 Q4 |
| Alyeska Investment Group | 296.8k | 0.54% | $42.5M | opened | 2026 Q1 |
| Public Sector Pension Investment Board | 283.5k | 0.52% | $40.6M | trimmed -3.1% | 2025 Q1 |
| Citadel Advisors | 282.4k | 0.52% | $40.4M | added +104.9% | 2013 Q3 |
| Schroder Investment Management Group | 276.0k | 0.50% | $39.5M | added +78.1% | 2021 Q4 |
| Nuveen | 274.1k | 0.50% | $39.2M | trimmed -32.9% | 2019 Q2 |
| Ameriprise Financial INC | 271.5k | 0.50% | $38.9M | trimmed -18.4% | ≤2013 |
| Algert Global LLC | 257.3k | 0.47% | $36.8M | trimmed -9.3% | 2022 Q3 |
| Wells Fargo & COMPANY/MN | 243.0k | 0.44% | $34.8M | trimmed -30.9% | ≤2013 |
| Gw&k Investment Management, LLC | 192.0k | 0.35% | $27.5M | trimmed -25.6% | 2014 Q2 |
| Swedbank Robur | 190.0k | 0.35% | $27.2M | added +2.7% | 2025 Q3 |
| Oberweis Asset Management INC/ | 166.1k | 0.30% | $23.8M | added +1.7% | 2023 Q3 |
| Allianz Asset Management GmbH | 156.5k | 0.29% | $22.4M | trimmed -2.2% | 2024 Q2 |
| State OF Wisconsin Investment Board | 154.7k | 0.28% | $22.1M | trimmed -12.4% | 2022 Q1 |
Largest 50 of 492 shown; the full ranked, searchable register is at boothcheck.com/holders/PRIM. 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.