| STStatewide Traffic Signal Company | Houston | TX | Computer and Electronic Product Manufacturing334290 | — | ◇ UNVERIFIED |
| SSSteel Surplus, INC. | Houston | TX | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| SEStoller Enterprise | Houston | TX | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| SCStone Cast, INC. | Houston | TX | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| SMStrategic Materials | Houston | TX | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| SVSubsea Ventures INC | Houston | TX | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| SPSummit Pressure Control | Houston | TX | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SMSun Machine, LTD | Houston | TX | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| STSunshine Tomato Company | Houston | TX | Food Manufacturing311422 | — | ◇ UNVERIFIED |
| SISuntronic, Inc. | Houston | TX | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| SCSuperior Cabinets By Vivaldi | Houston | TX | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| SDSuperior Drillpipe Manufacturing | Houston | TX | Fabricated Metal Product Manufacturing332996 | — | ◇ UNVERIFIED |
| SGSuperior Granite and Marble By Vivaldi, LLC | Houston | TX | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| SLSuper Lopez Food Products & Tortilla Factory | Houston | TX | Food Manufacturing311830 | — | ◇ UNVERIFIED |
| SFSup Factory Incorporated | Houston | TX | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| SCSurface Coating Facility | Houston | TX | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| SCSusie's Cakes, L.l.c. | Houston | TX | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| SMSwagger Media, LLC | Houston | TX | Computer and Electronic Product Manufacturing334613 | — | ◇ UNVERIFIED |
| SOSweco Oilfield Services | Houston | TX | Machinery Manufacturing333999 | — | ◇ UNVERIFIED |
| SSSystem Seals INC. | Houston | TX | Plastics and Rubber Products Manufacturing326291 | — | ◇ UNVERIFIED |
| TITam International | Houston | TX | Machinery Manufacturing333132 | — | ◇ UNVERIFIED |
| TITam International INC | Houston | TX | Plastics and Rubber Products Manufacturing326121 | — | ◇ UNVERIFIED |
| TFTanglewood Food Services LLC | Houston | TX | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| TCTejas Casing | Houston | TX | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| TTTejas Tubular Products | Houston | TX | Fabricated Metal Product Manufacturing332996 | — | ◇ UNVERIFIED |
| TETemple Electronics | Houston | TX | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| TMTenaris Mesa | Houston | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TUTerex Utilities INC. | Houston | TX | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| TATexas All Temp Control LLC | Houston | TX | Machinery Manufacturing333415 | — | ◇ UNVERIFIED |
| TATexas Arai | Houston | TX | Fabricated Metal Product Manufacturing332996 | — | ◇ UNVERIFIED |
| TGTexas Global Recycling | Houston | TX | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| TITexas Injection Molding, LLC | Houston | TX | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| TMTexas Metal Tech | Houston | TX | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| TMTexas Motor Depot INC | Houston | TX | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| TSTexas Steel Conversion INC | Houston | TX | Fabricated Metal Product Manufacturing332996 | — | ◇ UNVERIFIED |
| TSTexas Stell Conversion Almeda Rd Facility | Houston | TX | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
 Texas Tissue Converting | Houston | TX | Paper Manufacturing322291 | — | ◇ UNVERIFIED |
| TUTexas Urban Roots LLC | Houston | TX | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| TRTexcon Ready Mix Inc | Houston | TX | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| TFTex-Orleans Food Company LLC | Houston | TX | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| TJThe J & L Sheet Metal Co., INC. | Houston | TX | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| TPThe Potter's Ops LLC | Houston | TX | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| TQThe Queen Ready Mix, Inc. | Houston | TX | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| TThermo-mold | Houston | TX | Plastics and Rubber Products Manufacturing326122 | — | ◇ UNVERIFIED |
| TWThe Walworth CO | Houston | TX | Fabricated Metal Product Manufacturing332919 | — | ◇ UNVERIFIED |
| TBThomas & Betts CORP | Houston | TX | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
 Thomas Reprographics, INC. | Houston | TX | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| TSThompson Scale Company | Houston | TX | Machinery Manufacturing333997 | — | ◇ UNVERIFIED |
| TVThorin's Viking LLC | Houston | TX | Beverage and Tobacco Product Manufacturing312140 | — | ◇ UNVERIFIED |
| TCTillman Container | Houston | TX | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
