| CHX | ChampionX |
| EFXT | Enerflex |
| FET | Forum Energy |
| GEOS | Geospace |
| HLX | Helix Energy Solutions Group |
| MRC | MRC Global |
| NGS | Natural Gas Services Group |
| NOA | North American Construction Group |
| NR | NPK |
| OII | Oceaneering |
| RES | RPC |
| RNGR | Ranger Energy Services |
| TDW | Tidewater |
| VAL | Valaris |
| WHD | Cactus |