Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
221 institutional managers reported holding PFSI for the quarter ended Mar 31, 2026. Together they hold about 62% of shares outstanding; the top 10 hold 41%. 40 opened new positions; 77 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| MFN Partners Management, LP (focused) | 4.53M | 8.41% | $396.2M | unchanged | 2021 Q1 |
| T. Rowe Price Investment Management, INC. | 3.60M | 6.69% | $314.8M | added +383.7% | 2022 Q3 |
| Vanguard Group | 3.20M | 5.94% | $279.8M | added +12.8% | ≤2013 |
| Millennium Management | 2.39M | 4.43% | $208.6M | added +3868.6% | 2015 Q2 |
| BlackRock | 2.20M | 4.09% | $192.7M | unchanged | ≤2013 |
| Dimensional Fund Advisors | 1.92M | 3.56% | $167.5M | added +7.1% | 2014 Q3 |
| Donald Smith & CO., INC. | 1.37M | 2.55% | $120.0M | opened | 2026 Q1 |
| Citadel Advisors | 1.16M | 2.15% | $101.3M | added +172.3% | 2022 Q4 |
| State Street | 857.2k | 1.59% | $74.9M | added +5.3% | ≤2013 |
| Invesco | 849.1k | 1.58% | $74.2M | trimmed -45.9% | 2015 Q2 |
| FMR (Fidelity) | 749.3k | 1.39% | $65.5M | trimmed -66.3% | 2019 Q4 |
| Geode Capital | 707.9k | 1.31% | $61.9M | added +2.3% | ≤2013 |
| Goldman Sachs | 669.9k | 1.24% | $58.6M | added +18.8% | 2015 Q3 |
| Senvest Management, LLC (focused) | 508.6k | 0.94% | $44.5M | added +21.9% | ≤2013 |
| Charles Schwab Investment Management | 468.8k | 0.87% | $41.0M | added +6.2% | ≤2013 |
| Basswood Capital Management, L.l.c. | 461.4k | 0.86% | $40.3M | trimmed -16.3% | ≤2013 |
| American Century Companies INC | 432.5k | 0.80% | $37.8M | added +1.3% | 2019 Q4 |
| Bank OF America CORP /DE/ | 379.4k | 0.70% | $33.2M | added +173.9% | ≤2013 |
| Boston Partners | 362.1k | 0.67% | $31.7M | added +11.8% | 2023 Q4 |
| BlueCrest Capital Management LTD | 351.1k | 0.65% | $30.7M | opened | 2026 Q1 |
| Susquehanna International Group | 309.9k | 0.57% | $27.1M | added +2886.7% | 2024 Q3 |
| Kinetic Partners Management, LP (focused) | 308.8k | 0.57% | $27.0M | added +145.3% | 2024 Q3 |
| Wellington Management | 272.3k | 0.51% | $23.8M | opened | 2026 Q1 |
| Northern Trust | 268.0k | 0.50% | $23.4M | added +3.4% | ≤2013 |
| Janus Henderson | 267.9k | 0.50% | $23.4M | added +1882.2% | 2020 Q2 |
| Ameriprise Financial INC | 266.6k | 0.49% | $23.3M | trimmed -23.1% | 2023 Q3 |
| UBS | 259.8k | 0.48% | $22.7M | added +62.8% | 2013 Q3 |
| BNY Mellon | 235.7k | 0.44% | $20.6M | trimmed -7.9% | ≤2013 |
| Holocene Advisors | 228.9k | 0.42% | $20.0M | added +11001.4% | 2025 Q2 |
| MFS Investment Management | 205.2k | 0.38% | $17.9M | trimmed -5% | 2024 Q3 |
| Canyon Capital (focused) | 187.5k | 0.35% | $16.4M | opened | 2026 Q1 |
| Qube Research & Technologies LTD | 153.7k | 0.28% | $13.4M | trimmed -22.2% | 2020 Q4 |
| Lightrock Netherlands B.v. (focused) | 152.2k | 0.28% | $13.3M | added +22.4% | 2024 Q4 |
| Prescott Group Capital Management, L.l.c. | 146.0k | 0.27% | $12.8M | added +305.3% | 2021 Q3 |
| EverSource Wealth Advisors, LLC | 138.3k | 0.26% | $12.1M | added +40697.3% | 2024 Q4 |
| Symmetry Investments LP | 123.5k | 0.23% | $10.8M | opened | 2026 Q1 |
| Morgan Stanley | 118.9k | 0.22% | $10.4M | trimmed -17.5% | ≤2013 |
| Azora Capital LP (focused) | 109.9k | 0.20% | $9.6M | opened | 2026 Q1 |
| Palisade Capital Management, LP | 105.5k | 0.20% | $9.2M | trimmed -42.5% | 2024 Q2 |
| Clearline Capital LP | 102.4k | 0.19% | $9.0M | opened | 2026 Q1 |
| BW Gestao de Investimentos Ltda. | 87.5k | 0.16% | $7.7M | trimmed -2.8% | 2025 Q4 |
| AllianceBernstein | 85.2k | 0.16% | $7.5M | trimmed -1.3% | 2015 Q1 |
| K2 Principal Fund, L.p. | 81.0k | 0.15% | $7.1M | added +2598.3% | 2025 Q3 |
| Helix Partners Management LP (focused) | 79.0k | 0.15% | $6.9M | opened | 2026 Q1 |
| Philadelphia Financial Management of San Francisco, LLC (focused) | 69.4k | 0.13% | $6.1M | added +58.4% | 2023 Q2 |
| Dark Forest Capital Management LP | 67.1k | 0.13% | $5.9M | trimmed -19.6% | 2021 Q2 |
| 1832 Asset Management L.p. | 66.7k | 0.12% | $5.8M | added +13.8% | 2024 Q1 |
| EMG Holdings, L.p. (focused) | 65.7k | 0.12% | $5.7M | added +228.6% | 2022 Q4 |
| Nuveen | 65.6k | 0.12% | $5.7M | trimmed -56.3% | 2019 Q2 |
| Squarepoint Ops LLC | 63.2k | 0.12% | $5.5M | added +283.5% | 2023 Q3 |
Largest 50 of 221 shown; the full ranked, searchable register is at boothcheck.com/holders/PFSI. 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.