| STSierra Tool & Die INC | Tuolumne | CA | — | ◇ UNVERIFIED |
| STSigg Tool & Machine Products | Levittown | PA | — | ◇ UNVERIFIED |
| SMSigma Mfg | Palmdale | CA | — | ◇ UNVERIFIED |
| SMSii Megadiamond | Provo | UT | — | ◇ UNVERIFIED |
| STSiliconvalley Tool Supply | Santa Clara | CA | — | ◇ UNVERIFIED |
| SMSilver Maple LLC | Hillman | MI | — | ◇ UNVERIFIED |
| SCSimon CNC Machining, Inc. | North Hollywood | CA | — | ◇ UNVERIFIED |
| STSimplex Tool & Mold | Sarasota | FL | — | ◇ UNVERIFIED |
| STSimsak Tool and Machine Company | Southbridge | MA | — | ◇ UNVERIFIED |
| SSSingle Source Manufacturing, LLC | North Liberty | IN | — | ◇ UNVERIFIED |
| STSirois Tool Company, INC. | Berlin | CT | — | ◇ UNVERIFIED |
| SESk Engineering | Long Beach | CA | — | ◇ UNVERIFIED |
| SISkol Investments, LLC | North Salt Lake | UT | — | ◇ UNVERIFIED |
| SMSlp Machining | San Jose | CA | — | ◇ UNVERIFIED |
| STSmith Tool Company: Industria | Casper | WY | — | ◇ UNVERIFIED |
| SMS & M Machining Company | Wixom | MI | — | ◇ UNVERIFIED |
| SESnap-on Equipment, INC. - Snap-on Equipment | Conway | AR | — | ◇ UNVERIFIED |
| SSSolid Solutions Manufacturing INC | Huntington Beach | CA | — | ◇ UNVERIFIED |
| SISolingra Inc | Manchester | NY | — | ◇ UNVERIFIED |
| SASomec, a Divison of Snk America, INC. | Sanford | FL | — | ◇ UNVERIFIED |
| SHSOSD Holdings, LLC | Kentwood | MI | — | ◇ UNVERIFIED |
| SASouth Anchor Manufacturing | El Paso | TX | — | ◇ UNVERIFIED |
 South Central Manufacturing Corporation | Summersville | MO | — | ◇ UNVERIFIED |
| SMSoutheastern Manufacturing Enterprise, INC. | Franklin | TN | — | ◇ UNVERIFIED |
| STSoutheastern Tool Co., INC. | Aiken | SC | — | ◇ UNVERIFIED |
| SGSouthern Gage INC | Erin | TN | — | ◇ UNVERIFIED |
| SRSouthern Roller INC. | Carrollton | GA | — | ◇ UNVERIFIED |
| SMSouthwest Montana Machine Works LLC | Butte | MT | — | ◇ UNVERIFIED |
| STSpark Tool, INC. | Meadville | PA | — | ◇ UNVERIFIED |
| SISpartan Industrial Holdings Llc | Grandville | MI | — | ◇ UNVERIFIED |
| STSpartan Tool & Die | Sinclairville | NY | — | ◇ UNVERIFIED |
| STSpartan Tool Sales INC | Sterling Heights | MI | — | ◇ UNVERIFIED |
| SMSparton Metal Services | Garden Grove | CA | — | ◇ UNVERIFIED |
| STSpecial Tools,Inc. | Saint Francis | MN | — | ◇ UNVERIFIED |
| SMSpecialty Machine Co., INC. | Gastonia | NC | — | ◇ UNVERIFIED |
| STSpecialty Tooling Systems INC | Grand Rapids | MI | — | ◇ UNVERIFIED |
| SMSpectrum Metal Services INC. | Midlothian | VA | — | ◇ UNVERIFIED |
| SISperzel INC. | Cleveland | OH | — | ◇ UNVERIFIED |
| STSpringfield Tool & Die, INC. | Duncan | SC | — | ◇ UNVERIFIED |
| SASpytek Aerospace Corporation | Bensenville | IL | — | ◇ UNVERIFIED |
| SMS&s Machine and Construction, INC. | Uniontown | OH | — | ◇ UNVERIFIED |
| SStaffmark | Rogers | AR | — | ◇ UNVERIFIED |
| SCStar Custom Shielding Fabrication | Torrance | CA | — | ◇ UNVERIFIED |
| SIStar Iron Works, LLC | North Hollywood | CA | — | ◇ UNVERIFIED |
| SLStaub Laser Cutting, Inc. | Dayton | OH | — | ◇ UNVERIFIED |
| SSteelscape | Richmond | CA | — | ◇ UNVERIFIED |
| SMSteinkamp Moulding LTD | Erlanger | KY | — | ◇ UNVERIFIED |
| STStep Tools Unlimited INC Dba Destiny Tool | Morgan Hill | CA | — | ◇ UNVERIFIED |
| SGSterling Gun Drills INC. | North Bennington | VT | — | ◇ UNVERIFIED |
| SSSterling Steel Cutting | Jonesville | MI | — | ◇ UNVERIFIED |
