Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
396 institutional managers reported holding PTEN for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 60%. 81 opened new positions; 49 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 60.88M | 16.04% | $658.8M | added +4.4% | ≤2013 |
| Vanguard Group | 46.54M | 12.26% | $503.6M | added +10% | ≤2013 |
| Dimensional Fund Advisors | 21.21M | 5.59% | $229.5M | added +14.9% | ≤2013 |
| American Century Companies INC | 16.41M | 4.32% | $177.5M | added +4.3% | 2019 Q2 |
| Sourcerock Group LLC (focused) | 16.31M | 4.30% | $176.5M | added +4.6% | 2024 Q4 |
| Goldman Sachs | 15.24M | 4.01% | $164.8M | added +44.3% | ≤2013 |
| State Street | 14.99M | 3.95% | $162.1M | trimmed -1.8% | ≤2013 |
| Invesco | 13.37M | 3.52% | $144.7M | added +125% | ≤2013 |
| Fuller & Thaler Asset Management, INC. | 12.25M | 3.23% | $132.6M | trimmed -25.4% | 2014 Q1 |
| Principal Financial Group INC | 9.45M | 2.49% | $102.3M | added +11% | ≤2013 |
| VAN ECK Associates CORP | 8.91M | 2.35% | $96.4M | added +35.9% | ≤2013 |
| Geode Capital | 8.82M | 2.32% | $95.5M | added +2.2% | ≤2013 |
| Blackstone | 7.14M | 1.88% | $77.2M | trimmed -74.6% | 2023 Q3 |
| Morgan Stanley | 6.90M | 1.82% | $74.7M | added +12.2% | ≤2013 |
| Nomura Asset Management International INC. | 6.70M | 1.76% | $72.5M | trimmed -13.4% | 2024 Q3 |
| Millennium Management | 5.30M | 1.40% | $57.3M | trimmed -13.1% | 2017 Q1 |
| Fisher Investments | 5.16M | 1.36% | $55.8M | added +17.9% | 2018 Q1 |
| Thrivent Financial for Lutherans | 4.99M | 1.32% | $54.0M | added +2006% | 2025 Q3 |
| Victory Capital Management INC | 4.86M | 1.28% | $52.6M | added +102.6% | 2019 Q3 |
| Bank OF America CORP /DE/ | 4.86M | 1.28% | $52.5M | added +10.9% | ≤2013 |
| Monaco Asset Management SAM | 4.61M | 1.21% | $49.9M | trimmed -31.4% | 2024 Q3 |
| Charles Schwab Investment Management | 4.42M | 1.16% | $47.8M | added +8.6% | ≤2013 |
| Webs Creek Capital Management LP (focused) | 4.38M | 1.15% | $47.4M | opened | 2026 Q1 |
| Renaissance Technologies | 4.13M | 1.09% | $44.7M | trimmed -28% | 2024 Q3 |
| Arga Investment Management, LP | 3.91M | 1.03% | $42.3M | trimmed -2.6% | 2024 Q1 |
| BNY Mellon | 3.86M | 1.02% | $41.8M | trimmed -2.5% | ≤2013 |
| Northern Trust | 3.80M | 1.00% | $41.1M | added +4% | ≤2013 |
| UBS | 3.71M | 0.98% | $40.2M | trimmed -59% | ≤2013 |
| Nuveen | 3.65M | 0.96% | $39.5M | trimmed -5.9% | 2019 Q2 |
| Two Sigma | 3.58M | 0.94% | $38.8M | added +131.2% | 2025 Q4 |
| Squarepoint Ops LLC | 3.34M | 0.88% | $36.1M | opened | 2025 Q3 |
| Allspring Global Investments Holdings, LLC | 3.20M | 0.84% | $34.6M | trimmed -11.2% | 2021 Q4 |
| Merewether Investment Management, LP | 3.00M | 0.79% | $32.5M | opened | 2026 Q1 |
| Holocene Advisors | 2.86M | 0.75% | $30.9M | trimmed -65.5% | 2023 Q2 |
| Schroder Investment Management Group | 2.67M | 0.70% | $28.9M | added +11.8% | 2024 Q4 |
| Driehaus Capital Management LLC | 2.56M | 0.67% | $27.7M | opened | 2026 Q1 |
| Neuberger Berman Group LLC | 2.44M | 0.64% | $26.4M | added +4.7% | 2018 Q1 |
| Bridgeway Capital Management, LLC | 2.43M | 0.64% | $26.3M | trimmed -9.2% | 2025 Q4 |
| AQR Capital | 2.09M | 0.55% | $22.6M | unchanged | ≤2013 |
| Barclays PLC | 1.96M | 0.52% | $21.2M | added +74.9% | ≤2013 |
| Citigroup INC | 1.81M | 0.48% | $19.6M | added +656.4% | ≤2013 |
| SIR Capital Management, L.p. | 1.72M | 0.45% | $18.6M | opened | 2023 Q4 |
| Kahn Brothers Group INC (focused) | 1.69M | 0.45% | $18.3M | trimmed -3% | ≤2013 |
| Ameriprise Financial INC | 1.66M | 0.44% | $17.9M | trimmed -4.1% | ≤2013 |
| Franklin Resources | 1.65M | 0.44% | $17.9M | added +379.8% | 2017 Q2 |
| Edmond DE Rothschild Holding S.a. | 1.63M | 0.43% | $17.6M | trimmed -14.2% | 2016 Q2 |
| Empowered Funds, LLC | 1.52M | 0.40% | $16.5M | trimmed -11.5% | 2024 Q2 |
| Public Sector Pension Investment Board | 1.24M | 0.33% | $13.4M | added +3.5% | 2019 Q4 |
| J. Goldman & CO LP | 1.20M | 0.32% | $13.0M | trimmed -19.4% | 2025 Q4 |
| Cerity Partners LLC | 1.20M | 0.32% | $13.0M | added +3.6% | 2024 Q1 |
Largest 50 of 396 shown; the full ranked, searchable register is at boothcheck.com/holders/PTEN. 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.