| Abbott Laboratories |
| Advance Cast Stone Company, Inc. |
| AES Industries, Inc. |
| AFCO Steel Company |
| AISC |
| Alpha Industries |
| Bechtel |
| Cives Steel Company |
| CURB Technologies |
| Gate Precast Company, Inc. |
| Graycor Industrial Constructors, Inc. |
| High Concrete Technology, LLC |
| HK Systems |
| Indiana Bridge Midwest Steel |
| Industrial Facilities Engineering |
| International Erectors, Inc. |
| Iron Dynamics |
| ITT Industries - Sanitaire |
| Kerkstra Precast, Inc. |
| Laswell Steel Services, LLC |
| Manitowoc Cranes |
| McClellan/Blakemore |
| National Steel Constructors |
| NCI Building Systems |
| New Millennium |
| Novum Structures, LLC |
| Nucor |
| Parkson Corporation |
| Precast Concrete Specialties, Inc. |
| Ruekert & Mielke |
| Schuff Steel Company |
| Siemens Water Technologies |
| Spancrete Industries, Inc. |
| Steel Dynamics |
| Supersky Products |
| The Steel Joist Institute |
| TKS Industrial |
| Towne Investments |
| Tramont Corporation |
| Transwestern Commercial Services |
| Vulcraft |
| W&W Steel Company |
| Zalk Josephs Fabricators, LLC |
