| Symbol | Name | Country | Exchange |
|---|---|---|---|
| BW | Babcock & Wilcox Enterprises, Inc. | US | NYSE |
| FTEK | Fuel Tech, Inc. | US | NASDAQ |
| PFIE | Profire Energy, Inc. | US | NASDAQ |
| RCON | Recon Technology, Ltd. | US | NASDAQ |
| TANH | Tantech Holdings Ltd. | US | NASDAQ |
| VTNR | Vertex Energy, Inc | US | NASDAQ |