| Amount | Holding |
|---|---|
| 16.80% | Schlumberger Limited |
| 10.27% | Halliburton Company |
| 6.51% | Baker Hughes Company |
| 6.04% | Core Laboratories N.V |
| 5.22% | Cactus, Inc |
| 4.70% | National Oilwell Varco, Inc |
| 4.53% | Patterson-UTI Energy, Inc |
| 4.34% | Oceaneering International, Inc |
| 4.10% | Tenaris SA ADR |
| 3.99% | ChampionX Corporation |