| Amount | Holding |
|---|---|
| 17.26% | Schlumberger Ltd |
| 15.59% | Halliburton Co |
| 3.86% | Helmerich & Payne Inc |
| 3.78% | Baker Hughes Co Class A |
| 3.45% | National Oilwell Varco Inc |
| 3.38% | TechnipFMC PLC |
| 3.19% | Transocean Ltd |
| 2.71% | Apergy Corp |
| 2.11% | Core Laboratories NV |
| 2.09% | Patterson-UTI Energy Inc |