| SISefa Industrial Solutions | Gaston | SC | — | ◇ UNVERIFIED |
| SISeilkop Industries, INC. | Cincinnati | OH | — | ◇ UNVERIFIED |
| SMSei Manufacturing, Incorporated | Cromwell | IN | — | ◇ UNVERIFIED |
| STSeksun Texas | Irving | TX | — | ◇ UNVERIFIED |
| SMSelden Mast INC | Charleston | SC | — | ◇ UNVERIFIED |
| SMSelmco Metal Fabricators, INC. | Sidney | OH | — | ◇ UNVERIFIED |
| SISemco INC | Marion | OH | — | ◇ UNVERIFIED |
| SOSenior Operations LLC Dba Senior Aerospace Metal Bellows | Sharon | MA | — | ◇ UNVERIFIED |
| SFSentinela Folding Gate | Los Angeles | CA | — | ◇ UNVERIFIED |
| SFSentinel Fence, LLC | Lumberton | NC | — | ◇ UNVERIFIED |
| SSSentry Siren, INC. | Canon City | CO | — | ◇ UNVERIFIED |
| SWSentry Welding | Barstow | CA | — | ◇ UNVERIFIED |
| SSerco | San Diego | CA | — | ◇ UNVERIFIED |
| SDSerenity Designs | Marshfield | WI | — | ◇ UNVERIFIED |
| SSService Steel Aerospace | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| SGSfc Global Supply Chain, INC. | Pottstown | PA | — | ◇ UNVERIFIED |
| SFS & F Machining and Finishing, INC. | Kenosha | WI | — | ◇ UNVERIFIED |
| SESGH Enterprises, Inc. | Maple Grove | MN | — | ◇ UNVERIFIED |
| SPSGH Properties LLC | Rogers | MN | — | ◇ UNVERIFIED |
| SISg Investment America, INC | Vacaville | CA | — | ◇ UNVERIFIED |
| SBSGJB Business Holdings, Inc. | Circle Pines | MN | — | ◇ UNVERIFIED |
| SIShanker Industries | Deer Park | NY | — | ◇ UNVERIFIED |
| SBShannon Bain | San Diego | CA | — | ◇ UNVERIFIED |
| SGShannon Gates INC | Deer Park | NY | — | ◇ UNVERIFIED |
| SMShapiro Metal Supply Company | Saint Louis | MO | — | ◇ UNVERIFIED |
| SESharp Erectors LLC | Wentzville | MO | — | ◇ UNVERIFIED |
| SCShaw Custom Metal Fabrication LLC | Bluffton | SC | — | ◇ UNVERIFIED |
| SMShaws Mechanical / Dba Cgi Equipment | Bakersfield | CA | — | ◇ UNVERIFIED |
| SMSheet Metal Specialties LLC | Monroe | LA | — | ◇ UNVERIFIED |
| SMSheffield Metals, International | Denver | CO | — | ◇ UNVERIFIED |
| SIShellpro INC | Lockeford | CA | — | ◇ UNVERIFIED |
| SMShenandoah Manufacturing Company Incorporated | Harrisonburg | VA | — | ◇ UNVERIFIED |
| SMShoemaker Manufacturing CO | Cle Elum | WA | — | ◇ UNVERIFIED |
| SFSho-Me Fabrication LLC | Springfield | MO | — | ◇ UNVERIFIED |
| SIShoremaster INC | Fergus Falls | MN | — | ◇ UNVERIFIED |
| SBShouldice Bros Sheet Metal Mfg & Millwrights | Battle Creek | MI | — | ◇ UNVERIFIED |
| SIShumaker Ind/northumberland Plt | Northumberland | PA | — | ◇ UNVERIFIED |
| SCSi Chem LLC | Marietta | GA | — | ◇ UNVERIFIED |
| SISidco, INC (0575010226) | Sidney | OH | — | ◇ UNVERIFIED |
| SISidel, INC. | Norcross | GA | — | ◇ UNVERIFIED |
| SISierra International Machinery LLC | Bakersfield | CA | — | ◇ UNVERIFIED |
| SMSierra Metal Southwest, LLC | Las Vegas | NV | — | ◇ UNVERIFIED |
| STSierra Technologies | Tulsa | OK | — | ◇ UNVERIFIED |
| SCSignature Craft, LLC | Saint Louis | MO | — | ◇ UNVERIFIED |
| SFSignature Finishers | Cordele | GA | — | ◇ UNVERIFIED |
| SISigntech INC | San Diego | CA | — | ◇ UNVERIFIED |
| SCSilgan Containers Manufac CORP | Kingsburg | CA | — | ◇ UNVERIFIED |
 Silver Ring Splint Company | Charlottesville | VA | — | ◇ UNVERIFIED |
| SLSimair, LTD | Bixby | OK | — | ◇ UNVERIFIED |
| SSSimmons Stairways INC. | San Jose | CA | — | ◇ UNVERIFIED |
| SISimtek INC. | Amityville | NY | — | ◇ UNVERIFIED |
| SUSimt Usa, LLC | Fairburn | GA | — | ◇ UNVERIFIED |
| SESinger Equities INC Dba Triad Bellows Design & Mfg | Anaheim | CA | — | ◇ UNVERIFIED |
| SMSirk Mechanical Services, INC. | Philadelphia | PA | — | ◇ UNVERIFIED |
| SLSistek LLC | Somerset | TX | — | ◇ UNVERIFIED |
| SHSJT Holding Corp. | Bayamon | PR | — | ◇ UNVERIFIED |
| SDS&k Dealer Supply | Elk Grove | CA | — | ◇ UNVERIFIED |
| SRSkf Reelcraft Industries | Columbia City | IN | — | ◇ UNVERIFIED |
| SSSk Sales Company, INC. | Mountain Top | PA | — | ◇ UNVERIFIED |
| SGSkyground Group Inc | Clearbrook | MN | — | ◇ UNVERIFIED |
| SGSkyground Group Inc. | Clearbrook | MN | — | ◇ UNVERIFIED |
| SISkylon INC | Sugar Grove | PA | — | ◇ UNVERIFIED |
| STSky Tec Container Corporation | Grand Rapids | MI | — | ◇ UNVERIFIED |
| SLS L Auburn INC | Auburn | NY | — | ◇ UNVERIFIED |
| SWSleeper Welding | Belmont | NH | — | ◇ UNVERIFIED |
| SMSmc Metal Fabricators INC | Oshkosh | WI | — | ◇ UNVERIFIED |
| SSSme Steel | Pocatello | ID | — | ◇ UNVERIFIED |
| SMS. M. F., Inc. | O'Fallon | MO | — | ◇ UNVERIFIED |
| SCSmi Construction, INC. | San Leandro | CA | — | ◇ UNVERIFIED |
| SASmith Architectural Metals, LLC | Greensboro | NC | — | ◇ UNVERIFIED |
| SASmith Art Conservation LLC | Los Angeles | CA | — | ◇ UNVERIFIED |
| SBSmith Brothers Racing Products, INC. | Redmond | OR | — | ◇ UNVERIFIED |
 Smiths Interconnect INC | South Deerfield | MA | — | ◇ UNVERIFIED |
| SSSmith SS, LLC | Bowling Green | OH | — | ◇ UNVERIFIED |
| SISmithworks Iron and Design Inc. | Decatur | GA | — | ◇ UNVERIFIED |
| SISmithworks Iron & Design, Inc. | Decatur | GA | — | ◇ UNVERIFIED |
| SMSmj Metal Co., INC | Amherst | MA | — | ◇ UNVERIFIED |
| SMS.m.k. Machine & Fabrication, INC. | Ringgold | GA | — | ◇ UNVERIFIED |
| SMSmoky Mountain Rod & Customs, LLC | Knoxville | TN | — | ◇ UNVERIFIED |
| SESMP Engineering, Inc. | Arcadia | CA | — | ◇ UNVERIFIED |
| SISms Industries, LLC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| SMSmtc Manufacturing CORP of Massachusetts | Franklin | MA | — | ◇ UNVERIFIED |
| SMSmyth Metal Works LLC | Montpelier | VT | — | ◇ UNVERIFIED |
| STSnapp Tool & Die, Inc. | El Paso | TX | — | ◇ UNVERIFIED |
| SESnowline Engineering | Shingle Springs | CA | — | ◇ UNVERIFIED |
| SESnyder Equipment Co., INC. | Nixa | MO | — | ◇ UNVERIFIED |
 Snyder Manufacturing, Inc. | Salamanca | NY | — | ◇ UNVERIFIED |
| SOSolar of Michigan | Coopersville | MI | — | ◇ UNVERIFIED |
| SISolher Iron, Inc. | San Francisco | CA | — | ◇ UNVERIFIED |
| SPSolidification Products International, INC | North Haven | CT | — | ◇ UNVERIFIED |
| SRSolid Rock Gate Supply, INC Dba Welding Fabrication Services | Post Falls | ID | — | ◇ UNVERIFIED |
| SMSollock Metal Works, LLC | Clute | TX | — | ◇ UNVERIFIED |
| SISomething in the Orange | Colorado Springs | CO | — | ◇ UNVERIFIED |
| SMSondrol Machining LLC | Sunburg | MN | — | ◇ UNVERIFIED |
| SWSonoma Welding & Fabrication LLC | Cape May | NJ | — | ◇ UNVERIFIED |
| SCSonoran Capital Group, INC. | Tucson | AZ | — | ◇ UNVERIFIED |
| SPSooner Pipe Crosby Yard | Crosby | TX | — | ◇ UNVERIFIED |
| SISos/aaa Iron Works INC | Mobile | AL | — | ◇ UNVERIFIED |
| SPSouriau Paande Sequim | Sequim | WA | — | ◇ UNVERIFIED |
| SASouth Anna Stair & Rail | Norfolk | VA | — | ◇ UNVERIFIED |
