| Name | CIK | SIC | Ticker | Quote | News |
|---|---|---|---|---|---|
| CECO ENVIRONMENTAL CORP | 0000003197 | 3564 | CECO | Quote | News |
| DONALDSON Co INC | 0000029644 | 3564 | DCI | Quote | News |
| FUEL TECH, INC. | 0000846913 | 3564 | FTEK | Quote | News |
| Madison Air Solutions Corp | 0002098430 | 3564 | MAIR | Quote | News |
| Perma-Pipe International Holdings, Inc. | 0000914122 | 3564 | PPIH | Quote | News |