Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
415 institutional managers reported holding AROC for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 57%. 88 opened new positions; 42 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 28.10M | 16.11% | $978.0M | added +2.5% | 2015 Q4 |
| Vanguard Group | 19.93M | 11.42% | $693.5M | added +1.8% | 2015 Q4 |
| Earnest Partners LLC | 9.77M | 5.60% | $339.9M | trimmed -2.7% | 2018 Q1 |
| Invesco | 8.01M | 4.59% | $278.9M | trimmed -8.1% | 2015 Q4 |
| State Street | 7.24M | 4.15% | $251.8M | added +3.1% | 2015 Q4 |
| Bank OF America CORP /DE/ | 6.68M | 3.83% | $232.4M | trimmed -3.7% | 2015 Q4 |
| American Century Companies INC | 5.92M | 3.39% | $206.1M | added +6.6% | 2019 Q2 |
| Dimensional Fund Advisors | 5.52M | 3.17% | $192.3M | trimmed -19.1% | 2015 Q4 |
| SEI Investments CO | 4.43M | 2.54% | $154.3M | trimmed -2.1% | 2021 Q3 |
| Geode Capital | 4.16M | 2.38% | $144.7M | unchanged | 2015 Q4 |
| FMR (Fidelity) | 4.15M | 2.38% | $144.4M | trimmed -11.8% | 2016 Q2 |
| Goldman Sachs | 3.20M | 1.83% | $111.3M | trimmed -3.2% | 2015 Q4 |
| Vaughan Nelson Investment Management, L.p. | 2.50M | 1.43% | $87.1M | added +6.5% | 2025 Q4 |
| Neuberger Berman Group LLC | 2.40M | 1.38% | $83.5M | added +85.6% | 2025 Q1 |
| Morgan Stanley | 2.19M | 1.25% | $76.1M | trimmed -16.1% | 2015 Q4 |
| Charles Schwab Investment Management | 2.17M | 1.24% | $75.5M | added +1.1% | 2015 Q4 |
| BNY Mellon | 2.07M | 1.18% | $71.9M | trimmed -0.8% | 2015 Q4 |
| Franklin Resources | 2.05M | 1.18% | $71.5M | added +19.8% | 2021 Q3 |
| Northern Trust | 1.91M | 1.10% | $66.6M | added +2.2% | 2015 Q4 |
| Mirae Asset Global Etfs Holdings LTD. | 1.91M | 1.10% | $66.6M | trimmed -6.3% | 2018 Q3 |
| Natixis Advisors, LLC | 1.80M | 1.03% | $62.5M | added +6.6% | 2022 Q1 |
| Two Sigma | 1.59M | 0.91% | $55.2M | added +116% | 2023 Q1 |
| Energy Income Partners, LLC | 1.39M | 0.80% | $48.5M | trimmed -13.5% | 2022 Q2 |
| T. Rowe Price | 1.38M | 0.79% | $47.9M | added +772.6% | 2015 Q4 |
| Citadel Advisors | 1.29M | 0.74% | $44.9M | trimmed -37% | 2015 Q4 |
| Jones Financial Companies Lllp | 1.27M | 0.73% | $44.2M | added +44176.5% | 2024 Q3 |
| Clearbridge Investments, LLC | 1.26M | 0.72% | $44.0M | added +0.6% | 2024 Q4 |
| Stephens Investment Management Group LLC | 1.26M | 0.72% | $43.8M | unchanged | 2025 Q4 |
| Raymond James Financial INC | 1.23M | 0.71% | $42.9M | trimmed -2.5% | 2018 Q2 |
| Boston Partners | 1.13M | 0.65% | $39.2M | trimmed -6.5% | 2024 Q1 |
| D. E. Shaw | 1.09M | 0.63% | $38.0M | trimmed -31.4% | 2025 Q2 |
| Wells Fargo & COMPANY/MN | 1.02M | 0.59% | $35.6M | trimmed -9.1% | 2015 Q4 |
| Kayne Anderson Capital Advisors LP (focused) | 996.5k | 0.57% | $34.7M | added +80.6% | 2023 Q3 |
| Nuveen | 966.1k | 0.55% | $33.6M | trimmed -41.6% | 2019 Q2 |
| UBS | 928.4k | 0.53% | $32.3M | added +3% | 2015 Q4 |
| Principal Financial Group INC | 857.4k | 0.49% | $29.8M | added +2.3% | 2015 Q4 |
| Arrowstreet Capital | 830.1k | 0.48% | $28.9M | added +33.8% | 2023 Q3 |
| Panagora Asset Management INC | 803.6k | 0.46% | $28.0M | added +32.1% | 2025 Q2 |
| Tudor Investment | 730.1k | 0.42% | $25.4M | trimmed -28.2% | 2023 Q4 |
| Connor, Clark & Lunn Investment Management LTD. | 679.2k | 0.39% | $23.6M | added +4178.1% | 2025 Q2 |
| Marshall Wace | 670.2k | 0.38% | $23.3M | opened | 2026 Q1 |
| Public Sector Pension Investment Board | 627.4k | 0.36% | $21.8M | added +3.4% | 2015 Q4 |
| Renaissance Technologies | 591.5k | 0.34% | $20.6M | added +52.5% | 2018 Q3 |
| Envestnet Asset Management INC | 582.3k | 0.33% | $20.3M | trimmed -4.4% | 2018 Q4 |
| Focus Partners Wealth | 578.5k | 0.33% | $20.1M | added +16.8% | 2024 Q4 |
| Voloridge Investment Management | 557.5k | 0.32% | $19.4M | trimmed -19.8% | 2025 Q1 |
| Federated Hermes, INC. | 544.5k | 0.31% | $18.9M | added +34.2% | 2023 Q3 |
| Wellington Management | 509.9k | 0.29% | $17.7M | added +8.5% | 2025 Q1 |
| Barclays PLC | 499.0k | 0.29% | $17.4M | trimmed -47% | 2015 Q4 |
| Victory Capital Management INC | 497.9k | 0.28% | $17.3M | trimmed -25% | 2019 Q3 |
Largest 50 of 415 shown; the full ranked, searchable register is at boothcheck.com/holders/AROC. 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.