| Symbol | Name | Country | Exchange |
|---|---|---|---|
| EFXT | Enerflex Ltd | US | NYSE |
| ENSV | Enservco Corporation | US | AMEX |
| NGS | Natural Gas Services Group, Inc. | US | NYSE |
| CESDF | CES Energy Solutions Corp | US | OTC |
| MLLGF | Mullen Group Ltd | US | OTC |
| NSLPQ | New Source Energy Partners L.P. | US | OTC |
| MTL | Mullen Group Ltd. | CA | TSX |
| SDI | Stampede Drilling Inc. | CA | TSXV |
| 3899 | CIMC Enric Holdings Ltd | HK | HK |
| 600583 | Offshore Oil Engineering Co Ltd | CN | SHG |
| 9931 | Hsin Kao Gas Co Ltd | TW | TW |
| ANCE | Restance Inc | US | OTC |