| SASterling Atm INC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| SDSterling Dula, a Division of Kane Innovations | Erie | PA | — | ◇ UNVERIFIED |
| SSSterling Steel Company | Portland | OR | — | ◇ UNVERIFIED |
| SBStetson Building Products, LLC. | Eldridge | IA | — | ◇ UNVERIFIED |
| SJSteve Johnson Companies | Wichita | KS | — | ◇ UNVERIFIED |
| SWStevens Welding and Fabrication LLC | Eveleth | MN | — | ◇ UNVERIFIED |
| SZSteve Zappetini & Son INC | San Rafael | CA | — | ◇ UNVERIFIED |
 Steward Machine CO. INC Plant 2 | Birmingham | AL | — | ◇ UNVERIFIED |
| SIStewart Industrial | Tell City | IN | — | ◇ UNVERIFIED |
| SIStewart Iron Works LLC | Erlanger | KY | — | ◇ UNVERIFIED |
| SFSt Fabrication | Orting | WA | — | ◇ UNVERIFIED |
| SIStiltz Iron, INC | Clarksville | TN | — | ◇ UNVERIFIED |
| SLSt Lucie County International Airport | Fort Pierce | FL | — | ◇ UNVERIFIED |
| SIStocklin Iron INC | Santa Rosa | CA | — | ◇ UNVERIFIED |
| SMStone Manufacturing Company | Gardena | CA | — | ◇ UNVERIFIED |
| SMStone Manufacturing Custom Handmade Fireplace Accessories LLC | Buffalo Grove | IL | — | ◇ UNVERIFIED |
| SRStones River Steel | Miboro | TN | — | ◇ UNVERIFIED |
| SRStoney Ridge Fabricators | Palmerton | PA | — | ◇ UNVERIFIED |
| SSStratford Steel, LLC | Stratford | CT | — | ◇ UNVERIFIED |
| SMStrathmore Machinery INC | Strathmore | CA | — | ◇ UNVERIFIED |
| SSStretch Solutions LLC | Riverside | CA | — | ◇ UNVERIFIED |
| SCStrick Corporation | Abbeville | SC | — | ◇ UNVERIFIED |
 Strong Structural Steel, LTD | Pharr | TX | — | ◇ UNVERIFIED |
| SSStruc Steel INC | Spring Valley | CA | — | ◇ UNVERIFIED |
| SBStructall Building Systems, INC. | San Antonio | TX | — | ◇ UNVERIFIED |
| SCStructural Coatings, INC. | Clayton | NC | — | ◇ UNVERIFIED |
| SCStructural Coatings, INC. - Clayton | Clayton | NC | — | ◇ UNVERIFIED |
| SSStructural Steel Fabricators INC | Stanton | CA | — | ◇ UNVERIFIED |
| SSStructural Steel of Carolina - Hickory Steel | Hickory | NC | — | ◇ UNVERIFIED |
| SSStructural Steel Products Corporation | Clayton | NC | — | ◇ UNVERIFIED |
| SSStructural Steel Services Inc, Plant 3 | Meridian | MS | — | ◇ UNVERIFIED |
| SSStructural Steel Services, Inc., Plant 6 | Meridian | MS | — | ◇ UNVERIFIED |
| SSStructural Steel Services Inc, Plants 1 | Meridian | MS | — | ◇ UNVERIFIED |
| SSStructural Steel Services, Plant 1 | Meridian | MS | — | ◇ UNVERIFIED |
| SFStructure Fabricators | Evansville | IN | — | ◇ UNVERIFIED |
| SWStruthers Wells Corp/warren | Warren | PA | — | ◇ UNVERIFIED |
| SMStryker Metals LLC | Dayton | OH | — | ◇ UNVERIFIED |
| SStucke | Kent | WA | — | ◇ UNVERIFIED |
| SBStupp Bros INC | Richardsville | KY | — | ◇ UNVERIFIED |
| SBStyle By Design Properties, LLC | Beckley | WV | — | ◇ UNVERIFIED |
| SSSuburban Steel Supply Company LLC | Gahanna | OH | — | ◇ UNVERIFIED |
| SSSudden Services Inc, Distribution and Operations Center | Philadelphia | MS | — | ◇ UNVERIFIED |
| SSSukup Steel Structures LLC | Ambridge | PA | — | ◇ UNVERIFIED |
| SSSulphur Sheet Metal & Fabrication, INC. | Sulphur | LA | — | ◇ UNVERIFIED |
| SMSulta Manufacturing Company | Sulphur Springs | TX | — | ◇ UNVERIFIED |
| SCSulzer Chemtech Usa, INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| SSSummit Steel Works CORP | San Jose | CA | — | ◇ UNVERIFIED |
| SUSummit Utility Structures, LLC | Allentown | PA | — | ◇ UNVERIFIED |
| SFSunbelt Fabricator | Steele | AL | — | ◇ UNVERIFIED |
| SFSunburst Fabrications INC | Redmond | OR | — | ◇ UNVERIFIED |
