| SLShell Lubricants Fowlerville | Fowlerville | MI | — | ◇ UNVERIFIED |
| SCShrieve Chemical Services | Marlin | TX | — | ◇ UNVERIFIED |
| SLShuqualak Lumber Company Inc, Planer Mill Division | Shuqualak | MS | — | ◇ UNVERIFIED |
| SESiemens Energy & Automation Incorporated | Roebuck | SC | — | ◇ UNVERIFIED |
| SPSierra Pacific | Aberdeen | WA | — | ◇ UNVERIFIED |
| SPSierra Pacific-anderson | Anderson | CA | — | ◇ UNVERIFIED |
| SPSierra Pacific Burney Facility | Burney | CA | — | ◇ UNVERIFIED |
| SPSierra Pacific Ind. Sonora | Sonora | CA | — | ◇ UNVERIFIED |
 Sierra Pacific Industries | Mount Vernon | WA | — | ◇ UNVERIFIED |
| Sierra Pacific Industries Lincoln Div | Lincoln | CA | — | ◇ UNVERIFIED |
| SOSigma-genosys of Texas | The Woodlands | TX | — | ◇ UNVERIFIED |
| SCSika CORP | Aurora | IL | — | ◇ UNVERIFIED |
| SLSimpson Lumber CO LLC | Shelton | WA | — | ◇ UNVERIFIED |
| SLSimpson Lumber CO Meldrim Operations | Meldrim | GA | — | ◇ UNVERIFIED |
| SCSmark CO | South Gate | CA | — | ◇ UNVERIFIED |
| SSSolid Start INC | Lakeland | FL | — | ◇ UNVERIFIED |
| SISolutia INC Krummrich Il (part) | Sauget | IL | — | ◇ UNVERIFIED |
| SUSolvay USA Midland | Midland | TX | — | ◇ UNVERIFIED |
| SCSouth Coast Lumber CO. | Brookings | OR | — | ◇ UNVERIFIED |
 South Coast Terminals Strang Road Facility | La Porte | TX | — | ◇ UNVERIFIED |
| SWSoutheast Wood | Louisville | AL | — | ◇ UNVERIFIED |
| SWSouthern Wood Preserving of Hattiesburg INC | Hattiesburg | MS | — | ◇ UNVERIFIED |
| SLSouthwin LTD Nevada | Sparks | NV | — | ◇ UNVERIFIED |
| SLSpecchem, LLC | Kansas City | KS | — | ◇ UNVERIFIED |
| SCStella-jones CORP | Bangor | WI | — | ◇ UNVERIFIED |
| SCSternocandlelamp CO LLC | Memphis | TN | — | ◇ UNVERIFIED |
| SLStimson Lumber Company St Maries Mill | Saint Maries | ID | — | ◇ UNVERIFIED |
| SPStp Products Manufacturing CO | Painesville | OH | — | ◇ UNVERIFIED |
| SPStp Products Manufacturing Company | Vandalia | OH | — | ◇ UNVERIFIED |
| SCStruktol CO. of America | Villa Rica | GA | — | ◇ UNVERIFIED |
| SWSuez Wts USA INC | Addison | IL | — | ◇ UNVERIFIED |
| SWSuez Wts USA INC Beaumont - Plant | Beaumont | TX | — | ◇ UNVERIFIED |
| SFSuperior Forest Products LLC | Montezuma | IN | — | ◇ UNVERIFIED |
 Swanson Group Mfg. Llc, Springfield | Springfield | OR | — | ◇ UNVERIFIED |
| SCSyntech Cedar Port | Baytown | TX | — | ◇ UNVERIFIED |
| TCTaylor Chemical, INC. | Taylor | PA | — | ◇ UNVERIFIED |
| TOTeam Oil Tools | Tulsa | OK | — | ◇ UNVERIFIED |
| TITechnic INC | Cranston | RI | — | ◇ UNVERIFIED |
| TITemple Inland Forest Prod Corporation Southwest La Lumber Operations | Dequincy | LA | — | ◇ UNVERIFIED |
| TETexas Electric Cooperatives Treating Div | Jasper | TX | — | ◇ UNVERIFIED |
| TPThomaston Pretreatment Facility | Thomaston | GA | — | ◇ UNVERIFIED |
| TWThomas Wood Preserving INC | Grenada | MS | — | ◇ UNVERIFIED |
| TThunderline-z | Hampstead | NH | — | ◇ UNVERIFIED |
| TPTimber Producers Dewitt Sawmill Division | Dewitt | AR | — | ◇ UNVERIFIED |
| TPTimber Products CO. Limited Partnership | Medford | OR | — | ◇ UNVERIFIED |
| TSTimpie Salt Processing Plant | Grantsville | UT | — | ◇ UNVERIFIED |
| TLTolleson Lumber | Preston | GA | — | ◇ UNVERIFIED |
| TSTri State Lumber Company INC | Fulton | MS | — | ◇ UNVERIFIED |
| TLTroy Lumber Company INC. | Troy | NC | — | ◇ UNVERIFIED |
| TMTroy Manufacturing INC | Burton | OH | — | ◇ UNVERIFIED |
