| SSSeymour Sheridan INC | Monroe | CT | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
Sherline Products, Incorporated | Vista | CA | Fabricated Metal Product Manufacturing332212 | — | ◐ LIKELY ACTIVE |
| SPShuman Plastics INC | Depew | NY | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| SESiemens Energy, Incorporated | Fort Payne | AL | Machinery Manufacturing333611 | — | ◐ LIKELY ACTIVE |
| SISiemens Industry INC - Water Technologies Business Unit | Thomasville | GA | Machinery Manufacturing333310 | — | ◐ LIKELY ACTIVE |
| SWSiemens Westinghouse Power Corporation | Charlotte | NC | Machinery Manufacturing333611 | — | ◐ LIKELY ACTIVE |
| SISkoflo Industries INC | Woodinville | WA | Fabricated Metal Product Manufacturing332911 | 20-99 | ◐ LIKELY ACTIVE |
| SCSkutt Ceramic Products, INC. | Portland | OR | Machinery Manufacturing333994 | 20-99 | ◐ LIKELY ACTIVE |
| SMSmalley Manufacturing CO. INC. | Knoxville | TN | Machinery Manufacturing333922 | 20-99 | ◐ LIKELY ACTIVE |
Smith International INC | Houston | TX | Machinery Manufacturing333132 | — | ◐ LIKELY ACTIVE |
| STSolar Turbines Broken Arrow | Broken Arrow | OK | Machinery Manufacturing333611 | 100-499 | ◐ LIKELY ACTIVE |
| STSolar Turbines Incorporated | San Diego | CA | Machinery Manufacturing333611 | — | ◐ LIKELY ACTIVE |
| STSolar Turbines Kearny Mesa | San Diego | CA | Machinery Manufacturing333611 | 500+ | ◐ LIKELY ACTIVE |
| SDSolitron Devices INC | West Palm Beach | FL | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
Specialized Elevator Corporation | Santa Fe Springs | CA | Textile Mills313310 | — | ◐ LIKELY ACTIVE |
| SESpudnik Equipment CO | Blackfoot | ID | Machinery Manufacturing333111 | 500+ | ◐ LIKELY ACTIVE |
| SMStar Manufacturing International | Smithville | TN | Machinery Manufacturing333241 | 100-499 | ◐ LIKELY ACTIVE |
| SIStellar Industries, INC | Garner | IA | Machinery Manufacturing333924 | — | ◐ LIKELY ACTIVE |
| SESterling Electric | Indianapolis | IN | Machinery Manufacturing333612 | 20-99 | ◐ LIKELY ACTIVE |
Stewart Tubular Products LLC | Houston | TX | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| SIStihl Incorporated | Virginia Beach | VA | Printing and Related Support Activities323110 | 500+ | ◐ LIKELY ACTIVE |
| SIStihl Incorporated | Virginia Beach | VA | Plastics and Rubber Products Manufacturing326121 | 500+ | ◐ LIKELY ACTIVE |
| SIStihl Incorporated | Virginia Beach | VA | Machinery Manufacturing333112 | — | ◐ LIKELY ACTIVE |
| SLSt Louis Gear CO INC | Keokuk | IA | Machinery Manufacturing333612 | 20-99 | ◐ LIKELY ACTIVE |
Strube INC | Marietta | PA | Machinery Manufacturing333612 | — | ◐ LIKELY ACTIVE |
| SCStructural Concepts Corporation-grand Haven | Norton Shores | MI | Machinery Manufacturing333415 | 100-499 | ◐ LIKELY ACTIVE |
| SMSumitomo Machinery Corporation of America | Chesapeake | VA | Machinery Manufacturing333612 | 100-499 | ◐ LIKELY ACTIVE |
| SMSummers Manufacturing CO | Devils Lake | ND | Machinery Manufacturing333111 | 20-99 | ◐ LIKELY ACTIVE |
| SMSund Manufacturing | Newburg | ND | Machinery Manufacturing333111 | 20-99 | ◐ LIKELY ACTIVE |
| SFSuperior Fabrication CO LLC | Kincheloe | MI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| SISuperior Industries INC | Morris | MN | Machinery Manufacturing333922 | 100-499 | ◐ LIKELY ACTIVE |
| SWSuperior Welding & Manufacturing INC | Hermansville | MI | Machinery Manufacturing333318 | 20-99 | ◐ LIKELY ACTIVE |
Sutter Instrument CORP | Novato | CA | Machinery Manufacturing333314 | — | ◐ LIKELY ACTIVE |
| SPSweco Products, INC. | Sutter | CA | Machinery Manufacturing333111 | 20-99 | ◐ LIKELY ACTIVE |
| SISyncroflo INC | Norcross | GA | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
| SASyst a Matic Tool & Design | Meadville | PA | Machinery Manufacturing333319 | 1-19 | ◐ LIKELY ACTIVE |
| SESystems Engineering & Sales CO | Fort Wayne | IN | Machinery Manufacturing333911 | 20-99 | ◐ LIKELY ACTIVE |
| TMTabor Machine Company | Princeton | WV | Machinery Manufacturing333131 | 20-99 | ◐ LIKELY ACTIVE |
| TMTag Manufacturing, INC. | Chattanooga | TN | Machinery Manufacturing333120 | — | ◐ LIKELY ACTIVE |
| TITarter Industries | Liberty | KY | Fabricated Metal Product Manufacturing332117 | 100-499 | ◐ LIKELY ACTIVE |
| TTTawas Tool Company | East Tawas | MI | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| TCTaylor Co- Division of Carrier Commercial Refrigeration INC | Rockton | IL | Machinery Manufacturing333241 | — | ◐ LIKELY ACTIVE |
| TWT.b. Wood's INC. | Chambersburg | PA | Machinery Manufacturing333613 | 100-499 | ◐ LIKELY ACTIVE |
Tech Logic Corporation | Saint Paul | MN | Machinery Manufacturing333249 | — | ◐ LIKELY ACTIVE |
| TCTecumseh Compressor Company | Verona | MS | Machinery Manufacturing333415 | 100-499 | ◐ LIKELY ACTIVE |
| TRTei Rock Drills INC | Montrose | CO | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| TFTeledyne Flir Defense INC | Freeport | PA | Nonmetallic Mineral Product Manufacturing327215 | — | ◐ LIKELY ACTIVE |
| TCTennant Company | Louisville | KY | Machinery Manufacturing333310 | — | ◐ LIKELY ACTIVE |
| TSTerex South Dakota | Watertown | SD | Machinery Manufacturing333923 | — | ◐ LIKELY ACTIVE |
| TUTerex Usa, LLC | Waverly | IA | Machinery Manufacturing333120 | — | ◐ LIKELY ACTIVE |