| STShearer Tanks, LLC | Arco | ID | — | ◇ UNVERIFIED |
| SMShed Metalworks, LLC | Cunningham | KY | — | ◇ UNVERIFIED |
| SMSheelers Machine Shop | Branson | MO | — | ◇ UNVERIFIED |
| SMSheet Metal Designs | Jamesport | MO | — | ◇ UNVERIFIED |
| SMSheet Metal Engineers, INC. | Martinez | GA | — | ◇ UNVERIFIED |
| SMSheet Metal Forms L.l.c. | Glendale | AZ | — | ◇ UNVERIFIED |
 Sheet Metal Solutions INC | Tangent | OR | — | ◇ UNVERIFIED |
| Sheet Metal Solutions INC | Tangent | OR | — | ◇ UNVERIFIED |
| SMSheet Metal Specialist of Edmond, LLC | Edmond | OK | — | ◇ UNVERIFIED |
| SMSheet Metal Specialties Inc | Bismarck | ND | — | ◇ UNVERIFIED |
| SMSheet Metal Specialties LLC | Monroe | LA | — | ◇ UNVERIFIED |
| SMSheet Metal Systems, INC | Pinellas Park | FL | — | ◇ UNVERIFIED |
| SMSheet Metal Unlimited PL Inc. | Sunrise | FL | — | ◇ UNVERIFIED |
| SMSheet Metal Works | West Valley City | UT | — | ◇ UNVERIFIED |
| SMSheet Metal Works LLC | Nashville | TN | — | ◇ UNVERIFIED |
| SPSheet Pile LLC | Holderness | NH | — | ◇ UNVERIFIED |
| SMSheffield Metals, International | Denver | CO | — | ◇ UNVERIFIED |
| SMSheldon Mechanical Corporation | Santa Clarita | CA | — | ◇ UNVERIFIED |
| SIShellpro INC | Lockeford | CA | — | ◇ UNVERIFIED |
| SIShelton Industrial Pattern INC. | Saint Louis | MO | — | ◇ UNVERIFIED |
| SIShemoggun INC Dba Kramer - Moen Machine CO | Duluth | MN | — | ◇ UNVERIFIED |
| SMShenandoah Machine Shop | Shenandoah | VA | — | ◇ UNVERIFIED |
| SSShenkle Steel LLC | Madison | VA | — | ◇ UNVERIFIED |
| SSSheridan Sheet Metal CO | New Hope | MN | — | ◇ UNVERIFIED |
| SPSherman Products Company | Saint Louis | MO | — | ◇ UNVERIFIED |
| SMSherwood Manufacturing Corporation | Northport | MI | — | ◇ UNVERIFIED |
| SBShew Brothers INC. | Marion | IL | — | ◇ UNVERIFIED |
| SUShick U.s.a. | Kansas City | MO | — | ◇ UNVERIFIED |
| SRShields RE, LLC | Homosassa | FL | — | ◇ UNVERIFIED |
| SCShiloh Cody, LLC | Dayton | OH | — | ◇ UNVERIFIED |
| SIShiloh Industries, LLC | New Freedom | PA | — | ◇ UNVERIFIED |
| SIShiloh Industries, LLC | Dover | PA | — | ◇ UNVERIFIED |
| SSShiloh Services, INC. | Prospect | TN | — | ◇ UNVERIFIED |
| SMShiner Manufacturing INC. | Shiner | TX | — | ◇ UNVERIFIED |
| SHS & H Metal Products Inc | Topeka | IN | — | ◇ UNVERIFIED |
| SMShoemaker Manufacturing CO | Cle Elum | WA | — | ◇ UNVERIFIED |
| SBShollenbarger - Borella INC Dba Golden State Steel | Fowler | CA | — | ◇ UNVERIFIED |
| SFSho-Me Fabrication LLC | Springfield | MO | — | ◇ UNVERIFIED |
| SRShon Reim | San Jacinto | CA | — | ◇ UNVERIFIED |
| SRShon Reim | Temecula | CA | — | ◇ UNVERIFIED |
| SIShoreline Industries, INC. | Portsmouth | VA | — | ◇ UNVERIFIED |
| SIShoremaster INC | Fergus Falls | MN | — | ◇ UNVERIFIED |
| SBShouldice Bros Sheet Metal Mfg & Millwrights | Battle Creek | MI | — | ◇ UNVERIFIED |
| SIShouldice Industrial Manufacturers & Contractors INC. | Battle Creek | MI | — | ◇ UNVERIFIED |
| SMShow Me Welding and Fabrication, LLC | Curryville | MO | — | ◇ UNVERIFIED |
| SMShrewsbury Machine & Gear, INC. | Athens | WV | — | ◇ UNVERIFIED |
| SMShunn Machining LLC | Lowell | AR | — | ◇ UNVERIFIED |
| SCShur-lok CORP | Irvine | CA | — | ◇ UNVERIFIED |
| SHS & H Welding INC Dba S & H Metals | Sacramento | CA | — | ◇ UNVERIFIED |
| SCSi Chem LLC | Marietta | GA | — | ◇ UNVERIFIED |
| SISidco, INC (0575010226) | Sidney | OH | — | ◇ UNVERIFIED |
| SISidel, INC. | Norcross | GA | — | ◇ UNVERIFIED |
| SMSieckmann Metal Fab INC | Eagle Creek | OR | — | ◇ UNVERIFIED |
| STSiem Tool Company | Latrobe | PA | — | ◇ UNVERIFIED |
| SCSierra CIS, Inc. | Placerville | CA | — | ◇ UNVERIFIED |
| SISierra International Machinery LLC | Bakersfield | CA | — | ◇ UNVERIFIED |
| SMSierra - Manufacturing Corporation | Addison | IL | — | ◇ UNVERIFIED |
| SMSierra Metal Southwest, LLC | Las Vegas | NV | — | ◇ UNVERIFIED |
| STSierra Technologies | Tulsa | OK | — | ◇ UNVERIFIED |
| STSierra Tool & Die INC | Tuolumne | CA | — | ◇ UNVERIFIED |
| STSierra Torque Converters,dba Nasir Kassa | Ontario | CA | — | ◇ UNVERIFIED |
| STSigg Tool & Machine Products | Levittown | PA | — | ◇ UNVERIFIED |
| SISigmamotor INC. | Middleport | NY | — | ◇ UNVERIFIED |
| SSSigma Steel Incorporated | Bedford | IN | — | ◇ UNVERIFIED |
| SCSignature Cnc LLC | Harrison Township | MI | — | ◇ UNVERIFIED |
| SCSignature Craft, LLC | Saint Louis | MO | — | ◇ UNVERIFIED |
| SISigntech INC | San Diego | CA | — | ◇ UNVERIFIED |
| SOSIG OpCo LLC | Sturgis | MI | — | ◇ UNVERIFIED |
| SCSii Companies, INC. | Sun Valley | CA | — | ◇ UNVERIFIED |
| SCSilgan Containers Manufac CORP | Kingsburg | CA | — | ◇ UNVERIFIED |
| SCSilgan Containers Mfg CORP | Plover | WI | — | ◇ UNVERIFIED |
| SPSilgan Plastics Corporation | Langhorne | PA | — | ◇ UNVERIFIED |
| SLSilva LLC | Lockport | NY | — | ◇ UNVERIFIED |
| SMSilver Maple LLC | Hillman | MI | — | ◇ UNVERIFIED |
 Silver Ring Splint Company | Charlottesville | VA | — | ◇ UNVERIFIED |
| SSSilver State Stainless, INC. | Carson City | NV | — | ◇ UNVERIFIED |
| SSSilver Stone Sheet Metal Fabrications Corp. | Brooklyn | NY | — | ◇ UNVERIFIED |
| SSSilver Stone Sheet Metal Fabrications Corp. | Millstone Township | NJ | — | ◇ UNVERIFIED |
| SLSimair, LTD | Bixby | OK | — | ◇ UNVERIFIED |
| SISimar Industries, INC. | Ocala | FL | — | ◇ UNVERIFIED |
| SISimko Industrial Fabricators | Hammond | IN | — | ◇ UNVERIFIED |
| SSSimmons Stairways INC. | San Jose | CA | — | ◇ UNVERIFIED |
| SISimonds INC | Southbridge | MA | — | ◇ UNVERIFIED |
| STSimple Tool Co, INC. | Gloucester | MA | — | ◇ UNVERIFIED |
| SCSimplex Construction Supplies | Blaine | MN | — | ◇ UNVERIFIED |
| SMSimply Mfg (former) | Prairie Du Sac | WI | — | ◇ UNVERIFIED |
| SSSimpson Strong Tie | Riverside | CA | — | ◇ UNVERIFIED |
| SSSimpson Strong-tie | Gallatin | TN | — | ◇ UNVERIFIED |
| SISimtek INC. | Amityville | NY | — | ◇ UNVERIFIED |
| SUSimt Usa, LLC | Fairburn | GA | — | ◇ UNVERIFIED |
| SMSincere Metal Works | Amesbury | MA | — | ◇ UNVERIFIED |
| SISindr Industries Inc | Mt Clemens | MI | — | ◇ UNVERIFIED |
| SISinecera INC Dba Crown Precision | Irwindale | CA | — | ◇ UNVERIFIED |
| SESinger Equities INC Dba Triad Bellows Design & Mfg | Anaheim | CA | — | ◇ UNVERIFIED |
| SSSingle Source INC | Tallahassee | FL | — | ◇ UNVERIFIED |
 Sinicon Plastics INC | Lenox | MA | — | ◇ UNVERIFIED |
| SMSinter Metals INC | Richton Park | IL | — | ◇ UNVERIFIED |
| SMSirk Mechanical Services, INC. | Philadelphia | PA | — | ◇ UNVERIFIED |
| STSirois Tool Company, INC. | Berlin | CT | — | ◇ UNVERIFIED |
| SMSirota's Machine Company, INC. | New Brighton | PA | — | ◇ UNVERIFIED |
