| SLB | Schlumberger |
| RES | RPC |
| FTI | TechnipFMC |
| OII | Oceaneering |
| HAL | Halliburton Company |
| DRQ | Dril-Quip |
| HLX | Helix Energy Solutions Group |
| WHD | Cactus |
| OIS | Oil States |
| WFRD | Weatherford |
| SOI | Solaris Oilfield Infrastructure |
| MRC | MRC Global |
| VTOL | Bristow Group |
| CHX | ChampionX |
| RNGR | Ranger Energy Services |