| SIShouldice Industrial Manufacturers & Contractors INC. | Battle Creek | MI | — | ◇ UNVERIFIED |
| SBSign Builders, INC. | Birmingham | AL | — | ◇ UNVERIFIED |
| SCSii Companies, INC. | Sun Valley | CA | — | ◇ UNVERIFIED |
| SSSilver Stone Sheet Metal Fabrications Corp. | Millstone Township | NJ | — | ◇ UNVERIFIED |
| SSSilver Stone Sheet Metal Fabrications Corp. | Brooklyn | NY | — | ◇ UNVERIFIED |
| SISimar Industries, INC. | Ocala | FL | — | ◇ UNVERIFIED |
| SJS & J Tube, INC. | Wapello | IA | — | ◇ UNVERIFIED |
| SFSka Fab Steel, LLC | Durango | CO | — | ◇ UNVERIFIED |
| SCSketch Consulting INC | North Hills | CA | — | ◇ UNVERIFIED |
| SMSlabaugh Metal Fab | Bremen | IN | — | ◇ UNVERIFIED |
| SMSlatem Metals LLC | Great Falls | MT | — | ◇ UNVERIFIED |
| SISlaughter Industrial Fabrication Company, LLC | Houston | TX | — | ◇ UNVERIFIED |
| SMSlh Metals | Corunna | MI | — | ◇ UNVERIFIED |
| SLS. L. M., Inc. | Broadview Heights | OH | — | ◇ UNVERIFIED |
| SMSmart Metals | Lawrence | MA | — | ◇ UNVERIFIED |
| SVSmart Vent Products Inc | Juno Beach | FL | — | ◇ UNVERIFIED |
| SWSmith Welding | Cedartown | GA | — | ◇ UNVERIFIED |
| SISms Industries LLC | Hamden | CT | — | ◇ UNVERIFIED |
| SISmt Incorporated - Raleigh Plant | Raleigh | NC | — | ◇ UNVERIFIED |
| SASnappy Adp Div of Standex International | Detroit Lakes | MN | — | ◇ UNVERIFIED |
| SMSnappy Manufacturing | Medina | NY | — | ◇ UNVERIFIED |
| SSSnodgrass Sheet Metal | Lanett | AL | — | ◇ UNVERIFIED |
| SISnyder Industries | Houston | TX | — | ◇ UNVERIFIED |
| SSSolutions Sheetmetal Inc. | Brooklyn | NY | — | ◇ UNVERIFIED |
| SSSouthbridge Sheet Metal | Southbridge | MA | — | ◇ UNVERIFIED |
| SCSouth County Sheet Metal & Specialties INC | La Pine | OR | — | ◇ UNVERIFIED |
| SMSoutheastern Metal Products LLC | Charlotte | NC | — | ◇ UNVERIFIED |
| SMSoutheastern Metals | Jacksonville | FL | — | ◇ UNVERIFIED |
| SSSoutheastern Stud & Components, INC. | Montgomery | AL | — | ◇ UNVERIFIED |
| STSoutheastern Tool & Die | Aberdeen | NC | — | ◇ UNVERIFIED |
 Southern Fabricators, INC. | Polkton | NC | — | ◇ UNVERIFIED |
| SSSouthern Sheet Metal, INC. | Suffolk | VA | — | ◇ UNVERIFIED |
| SSSouthern Specialties CORP | Tulsa | OK | — | ◇ UNVERIFIED |
| STSouth Texas Sheet Metal LLC | Houston | TX | — | ◇ UNVERIFIED |
| SMSouthwark Metal | Southaven | MS | — | ◇ UNVERIFIED |
| SMSouthwark Metal Manufacturing Company | Powdersville | SC | — | ◇ UNVERIFIED |
| SISpan-o-matic INC | Brea | CA | — | ◇ UNVERIFIED |
| SFSpecialty Fabrication, INC. | Wichita | KS | — | ◇ UNVERIFIED |
| SFSpecialty Fabrication & Powder Coatingllc | Oil City | PA | — | ◇ UNVERIFIED |
| SFSpecialty Fabricators INC. | York | PA | — | ◇ UNVERIFIED |
| SMSpecialty Metal Fabricators LLC | Portland | OR | — | ◇ UNVERIFIED |
| SSSpecialty Steel Services Facility | Philadelphia | PA | — | ◇ UNVERIFIED |
| SRSpectrum Resources LLC | Suwanee | GA | — | ◇ UNVERIFIED |
| SCSpider Company INC | Machesney Park | IL | — | ◇ UNVERIFIED |
| SSSpider Staging CORP | Seattle | WA | — | ◇ UNVERIFIED |
| SISpig Industries | Bristol | VA | — | ◇ UNVERIFIED |
| SISpinnaker Industries International, INC. | Louisville | KY | — | ◇ UNVERIFIED |
| SMSpiral Manufacturing CO INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| SHSpl Holdings, LLC | Delran | NJ | — | ◇ UNVERIFIED |
| SFSrs Fabrication, INC. | North Las Vegas | NV | — | ◇ UNVERIFIED |
