| SBStupp Bros INC | Richardsville | KY | — | ◇ UNVERIFIED |
| SPStur-d Products Company, INC. | Carson | ND | — | ◇ UNVERIFIED |
| SSSuburban Steel Supply Company LLC | Gahanna | OH | — | ◇ UNVERIFIED |
| SMSukup Manufacturing CO Clear Lake | Clear Lake | IA | — | ◇ UNVERIFIED |
| SSSukup Steel Structures LLC | Ambridge | PA | — | ◇ UNVERIFIED |
| SMSulta Manufacturing Company | Sulphur Springs | TX | — | ◇ UNVERIFIED |
| SCSulzer Chemtech Usa, INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| SASummit Attachment & Machinery, LLC | Kelso | WA | — | ◇ UNVERIFIED |
| SSSummit Steel Works CORP | San Jose | CA | — | ◇ UNVERIFIED |
| SUSummit Utility Structures, LLC | Allentown | PA | — | ◇ UNVERIFIED |
| SFSunburst Fabrications INC | Redmond | OR | — | ◇ UNVERIFIED |
| SESunrise Erectors | Canton | MA | — | ◇ UNVERIFIED |
| SMSunshine Metals | Corona | CA | — | ◇ UNVERIFIED |
| SSSun Steel Company | University Park | IL | — | ◇ UNVERIFIED |
| SSunsteel,llc | Sunnyside | WA | — | ◇ UNVERIFIED |
| SDSuper Duty, INC. | Hot Springs | AR | — | ◇ UNVERIFIED |
| SASuperior Architecture Mfg INC | Bell Gardens | CA | — | ◇ UNVERIFIED |
| SFSuperior Fabrication INC. | Canadian | TX | — | ◇ UNVERIFIED |
| SFSuperior Fabrication & Welding LLC | Punta Gorda | FL | — | ◇ UNVERIFIED |
| SISuperior Industries, LLC | Superior | NE | — | ◇ UNVERIFIED |
| SISuperior Iron INC | Otsego | MN | — | ◇ UNVERIFIED |
| SMSuperior Mason Products LLC | Homewood | AL | — | ◇ UNVERIFIED |
| SMSuperior Mason Products LLC | Birmingham | AL | — | ◇ UNVERIFIED |
| SSSuperior Steel Connectors Inc | Ronkonkoma | NY | — | ◇ UNVERIFIED |
| SSSuperior Steel Connectors Inc | Bay Shore | NY | — | ◇ UNVERIFIED |
 Superior Steel Products | Kinzers | PA | — | ◇ UNVERIFIED |
| SSSuperior Suppliers Network, LLC | Houghton | MI | — | ◇ UNVERIFIED |
 Superior Tank CO INC | Rancho Cucamonga | CA | — | ◇ UNVERIFIED |
| SSSuper Steel LLC | Milwaukee | WI | — | ◇ UNVERIFIED |
| SSSuper Steel Products CORP | Milwaukee | WI | — | ◇ UNVERIFIED |
| SMSupreme Manufacutring, INC. | Stoneboro | PA | — | ◇ UNVERIFIED |
| SASustainable Agricultural Technologies INC | Cottage Grove | OR | — | ◇ UNVERIFIED |
| SBSutter Buttes Ag Distribution | Olivehurst | CA | — | ◇ UNVERIFIED |
| SASutton Agricultural Enterprises, INC. | Salinas | CA | — | ◇ UNVERIFIED |
| SISuwannee Iron Works & Fence, INC. | O Brien | FL | — | ◇ UNVERIFIED |
| SLSwanky LLC | Melba | ID | — | ◇ UNVERIFIED |
| SFSweatshop Fabrication | Robstown | TX | — | ◇ UNVERIFIED |
| SASwift-cor Aerospace, INC. | Gardena | CA | — | ◇ UNVERIFIED |
| SSSymons Steel Forms Div | New Braunfels | TX | — | ◇ UNVERIFIED |
| TITacoma Iron Work | Spanaway | WA | — | ◇ UNVERIFIED |
| TWTac Welding INC | Bend | OR | — | ◇ UNVERIFIED |
| TITalley Iron Works, LLC | Pearl River | LA | — | ◇ UNVERIFIED |
| TMTalley Metal Fabrication | San Jacinto | CA | — | ◇ UNVERIFIED |
| TMTalley Metal Products | Hagerstown | MD | — | ◇ UNVERIFIED |
| TITallman Iron Works INC | Maryville | TN | — | ◇ UNVERIFIED |
| TMTalton's Metal Products, INC. | Fuquay Varina | NC | — | ◇ UNVERIFIED |
| TITamer Industries | Somerset | MA | — | ◇ UNVERIFIED |
| TATampa Amalgamated Steel | Tampa | FL | — | ◇ UNVERIFIED |
| TITandem Inductries LLC | Boulder City | NV | — | ◇ UNVERIFIED |
| TITandem Industries, LLC. | Las Vegas | NV | — | ◇ UNVERIFIED |
