| Amount | Holding |
|---|---|
| 7.36% | Baker Hughes Company |
| 6.41% | Dril-Quip, Inc |
| 5.52% | National Oilwell Varco, Inc |
| 5.22% | ProPetro Holding Corp |
| 5.16% | Halliburton Company |
| 5.06% | U.S. Silica Holdings, Inc |
| 5.04% | Helmerich & Payne, Inc |
| 4.99% | Schlumberger Limited |
| 4.76% | Core Laboratories N.V |
| 4.50% | Oceaneering International, Inc |