| 1 | Pena-Plas Co. | | USA |
| 2 | MRC Global | | USA |
| 3 | Sewickley Construction Products Inc. | | USA |
| 4 | Mammoth Carbon Products | | USA |
| 5 | A Metal Source LLC | | USA |
| 6 | P.C. Campana Inc. | | USA |
| 7 | Eastern Wholesale Fence Co. Inc. | | USA |
| 8 | Jindal Saw Limited | | USA |
| 9 | Advanced Drainage Systems Inc. | | USA |
| 10 | Insul-Tek Piping System Inc. | | USA |
| 11 | ICO Permian | | USA |
| 12 | Kelolite | | USA |
| 13 | Reliable Source Inc. | | USA |
| 14 | Contech Engineered Solutions LLC | | USA |
| 15 | Marstan Inc. | | USA |
| 16 | The Tin Knockers Industrial | | USA |
| 17 | Commercial Resins | | USA |
| 18 | PCM Co. (Plastics Consulting & Mfg. Co.) | | USA |
| 19 | Petrosmith | | USA |
| 20 | Integrated Products & Services Inc. (IPS) | | USA |
| 21 | U.S. Industrial Piping Inc. | | USA |
| 22 | Alloy Surfaces Inc. | | USA |
| 23 | Industrial Supply & Rental | | USA |
| 24 | Aquatherm | | USA |
| 25 | JFE Steel America Inc. | | USA |
| 26 | National Integrated Systems | | USA |
| 27 | Arntzen Pipe | | USA |
| 28 | Fab-Tech Inc. | | USA |
| 29 | Perma-Pipe Inc. | | USA |
| 30 | Bushwick Metals LLC | | USA |
| 31 | Cust-O-Bend | | USA |
| 32 | United Pipe Nipple Company | | USA |
| 33 | AutoVac Industrial Vacuum & Air Systems | | USA |
| 34 | Valiant Steel | | USA |
| 35 | Indianhead Pipeline Services | | USA |
| 36 | Piping Systems Inc. | | USA |
| 37 | Kottler Metal Products Inc. | | USA |
