| RES | RPC |
| NOA | North American Construction Group |
| OII | Oceaneering |
| DRQ | Dril-Quip |
| HLX | Helix Energy Solutions Group |
| CCLP | CSI Compressco LP |
| OIS | Oil States |
| FET | Forum Energy |
| NR | Newpark Resources |
| SOI | Solaris Oilfield Infrastructure |
| GEOS | Geospace |
| EFXT | Enerflex |
| MRC | MRC Global |
| AROC | Archrock |
| RNGR | Ranger Energy Services |