| SASmith Art Conservation LLC | Los Angeles | CA | — | ◇ UNVERIFIED |
| STSmith Truck Crane & Equipment, INC. | Cuyahoga Falls | OH | — | ◇ UNVERIFIED |
| SISmithworks Iron and Design Inc. | Decatur | GA | — | ◇ UNVERIFIED |
| SISmithworks Iron & Design, Inc. | Decatur | GA | — | ◇ UNVERIFIED |
| SMSmyth Metal Works LLC | Montpelier | VT | — | ◇ UNVERIFIED |
 Snorkel International INC | Elwood | KS | — | ◇ UNVERIFIED |
| SOSolar of Michigan | Coopersville | MI | — | ◇ UNVERIFIED |
| SISolher Iron, Inc. | San Francisco | CA | — | ◇ UNVERIFIED |
| SRSolid Rock Gate Supply, INC Dba Welding Fabrication Services | Post Falls | ID | — | ◇ UNVERIFIED |
| SISomatex, INC. | Rumford | ME | — | ◇ UNVERIFIED |
| SWSonoma Welding & Fabrication LLC | Cape May | NJ | — | ◇ UNVERIFIED |
| SCSonoran Capital Group, INC. | Tucson | AZ | — | ◇ UNVERIFIED |
| SASouth Anna Stair & Rail | Norfolk | VA | — | ◇ UNVERIFIED |
| SBSouth Bay Iron, INC | Buena Park | CA | — | ◇ UNVERIFIED |
| SMSoutheastern Metal Fabricator | Rockland | MA | — | ◇ UNVERIFIED |
| SASouthern Aluminum Finishing D.b.a. Saf Metal Fab | Villa Rica | GA | — | ◇ UNVERIFIED |
| SASouthern Aluminum Finishing D.b.a. Saf Metal Fab | Atlanta | GA | — | ◇ UNVERIFIED |
| SFSouth Florida Aluminum INC. | Lake Worth | FL | — | ◇ UNVERIFIED |
| SISouthwest Industrial Rigging | Black Canyon City | AZ | — | ◇ UNVERIFIED |
| SSpacesonic | San Carlos | CA | — | ◇ UNVERIFIED |
| SISpanco, Incorporated | Morgantown | PA | — | ◇ UNVERIFIED |
| SESpantex Expanded Metal, INC. | Lincolnton | NC | — | ◇ UNVERIFIED |
| SISpecial Iron Security Systems INC | South El Monte | CA | — | ◇ UNVERIFIED |
| SSSpeciality Stairs and Miscellaneous Fabrication INC | Pearl | MS | — | ◇ UNVERIFIED |
| SMSpecial Metal Works | Rayne | LA | — | ◇ UNVERIFIED |
| SBSpecialty Building Components | Pico Rivera | CA | — | ◇ UNVERIFIED |
| SMSpecialty Metal Fabricators | Caledonia | MI | — | ◇ UNVERIFIED |
| SSSpecialty Systems | Bloomington | MN | — | ◇ UNVERIFIED |
| SSSpiral Stairs of America, LLC | Erie | PA | — | ◇ UNVERIFIED |
| SSSportsman Steel Safes | Long Beach | CA | — | ◇ UNVERIFIED |
| SSSprial Systems, INC. | Nesbit | MS | — | ◇ UNVERIFIED |
| SRS & R Architectural Metals INC | Anaheim | CA | — | ◇ UNVERIFIED |
| SIS.R. Iron, Inc. | Windsor | CA | — | ◇ UNVERIFIED |
| SIS.s. Industries | Collegeville | PA | — | ◇ UNVERIFIED |
| SISs Industries Llc, Dba Salter Spiral Stair | Collegeville | PA | — | ◇ UNVERIFIED |
| STS-square Tube Products, INC. | Commerce City | CO | — | ◇ UNVERIFIED |
| SMStaco Manufacturing Dba Staco Decorative Iron | Hattiesburg | MS | — | ◇ UNVERIFIED |
| STStafford Tower Cranes of America, LLC | Denver | CO | — | ◇ UNVERIFIED |
| SCStaging Concepts INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| SCStainless Cable & Railing, Inc | Washougal | WA | — | ◇ UNVERIFIED |
| SAStairs and Rails INC. | Melrose Park | IL | — | ◇ UNVERIFIED |
| SIStandard Iron, INC. | Chattanooga | TN | — | ◇ UNVERIFIED |
| SSStandard Sculpture LLC | Los Angeles | CA | — | ◇ UNVERIFIED |
| SCStar Crane & Hoist INC. | Trenton | MI | — | ◇ UNVERIFIED |
| SAStarlite Aluminum Products INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| SCSteel City CORP | Youngstown | OH | — | ◇ UNVERIFIED |
| SISteelco INC | Denver | CO | — | ◇ UNVERIFIED |
| SDSteel Designs Iron Artwork LLC | Charlotte | NC | — | ◇ UNVERIFIED |
 Steele Solutions INC | Franklin | WI | — | ◇ UNVERIFIED |
| SFSteel Farmer LLC | Saint Francis | WI | — | ◇ UNVERIFIED |
