 South Central Manufacturing Corporation | Summersville | MO | — | ◇ UNVERIFIED |
| SMSoutheastern Manufacturing Enterprise, INC. | Franklin | TN | — | ◇ UNVERIFIED |
| SRSouthern Roller INC. | Carrollton | GA | — | ◇ UNVERIFIED |
| SMSouthwest Montana Machine Works LLC | Butte | MT | — | ◇ UNVERIFIED |
| SMSparton Metal Services | Garden Grove | CA | — | ◇ UNVERIFIED |
| STSpecial Tools,Inc. | Saint Francis | MN | — | ◇ UNVERIFIED |
| SMSpectrum Metal Services INC. | Midlothian | VA | — | ◇ UNVERIFIED |
| SASpytek Aerospace Corporation | Bensenville | IL | — | ◇ UNVERIFIED |
| SIStar Iron Works, LLC | North Hollywood | CA | — | ◇ UNVERIFIED |
| SSteelscape | Richmond | CA | — | ◇ UNVERIFIED |
| STStep Tools Unlimited INC Dba Destiny Tool | Morgan Hill | CA | — | ◇ UNVERIFIED |
| SSteverosten | Redding | CA | — | ◇ UNVERIFIED |
| SMStone Machine Company LLC | Fort Loudon | PA | — | ◇ UNVERIFIED |
| SCStoner CNC, LLC | Archbold | OH | — | ◇ UNVERIFIED |
| SStratmet | Milpitas | CA | — | ◇ UNVERIFIED |
| SMSummit Machine Inc. | Saint Paul | MN | — | ◇ UNVERIFIED |
| SASunnen Abrasives | Saint Louis | MO | — | ◇ UNVERIFIED |
| SDSuspension Development Group | El Cajon | CA | — | ◇ UNVERIFIED |
| SPSutherland Presses | La Mirada | CA | — | ◇ UNVERIFIED |
| SMSwafford-Kientzy Machine & Fabrication, Inc | Troy | MO | — | ◇ UNVERIFIED |
| SMSwagelok Manufacturing CO LLC | Solon | OH | — | ◇ UNVERIFIED |
| SSSwenson Steel Products Company INC Dba Swenson Shear | Atwater | CA | — | ◇ UNVERIFIED |
| SLSymmetry LLC Dba Symmetry Laser | Davis | CA | — | ◇ UNVERIFIED |
| TCTapmatic CORP | Irvine | CA | — | ◇ UNVERIFIED |
| TGTaylor Group Inc, Ackerman | Ackerman | MS | — | ◇ UNVERIFIED |
| TDT D Manufacturing INC. | Garden Grove | CA | — | ◇ UNVERIFIED |
| TETechnical Employment Training INC | San Bernardino | CA | — | ◇ UNVERIFIED |
| TMTechpro Manufacturing INC | Salinas | CA | — | ◇ UNVERIFIED |
| TMTechpro Manufacturing INC | Salinas | CA | — | ◇ UNVERIFIED |
| TMTello Metal Polish | Colton | CA | — | ◇ UNVERIFIED |
| TWThe Western States Machine Company | Fairfield | OH | — | ◇ UNVERIFIED |
| TMThriller Metal Fabrication & Manufacturing LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| THTiger Heart Metal Works LLC | Dallas | TX | — | ◇ UNVERIFIED |
 Tiger Precision Machining | Manteca | CA | — | ◇ UNVERIFIED |
| TPTioga Pipe Supply CO. INC | Philadelphia | PA | — | ◇ UNVERIFIED |
| TTiss | Houston | TX | — | ◇ UNVERIFIED |
| TMTlc Machining in C | San Jose | CA | — | ◇ UNVERIFIED |
| TRTM Realty, LLC | Muskegon | MI | — | ◇ UNVERIFIED |
| TTnamachining | San Jose | CA | — | ◇ UNVERIFIED |
| TMTrak Machine Tools | Boxborough | MA | — | ◇ UNVERIFIED |
| TGTru-edge Grinding INC | Saint Henry | OH | — | ◇ UNVERIFIED |
| TITrumpf INC | Costa Mesa | CA | — | ◇ UNVERIFIED |
| TITru-op Industries, INC. | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| TETyco Electronics CORP | Harrisburg | PA | — | ◇ UNVERIFIED |
| UMUltimate Metal Manufacturing LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| UDUniversal / Devlieg Inc. | Saginaw | MI | — | ◇ UNVERIFIED |
| UHUniversal Hydrogen | Hawthorne | CA | — | ◇ UNVERIFIED |
| UIUnova Ind Automation/landis Gardner Div | Waynesboro | PA | — | ◇ UNVERIFIED |
| UOUsdol Osha - Cincinnati Area Office | Fairfield | OH | — | ◇ UNVERIFIED |
| UTUS Tool Grinding Tool INC Dba US Tool Group Palmdale | Los Angeles | CA | — | ◇ UNVERIFIED |
