| PIPier-sol, INC. | Baltimore, MD | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| PIPlastipak INC | Havre De Grace, MD | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PCPowercon Corporation | Severn, MD | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◇ UNVERIFIED |
| PCPq CORP. | Baltimore, MD | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| PBPrice Brothers Company | Perryman, MD | Nonmetallic Mineral Product Manufacturing327332 | — | ◇ UNVERIFIED |
| PCPrinting CORP of America | Timonium, MD | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| QAQuad Avenue Chemical & Biofuels Site | Baltimore, MD | Computer and Electronic Product Manufacturing334418 | — | ◇ UNVERIFIED |
| QIQuest International | Owings Mills, MD | Food Manufacturing311930 | — | ◇ UNVERIFIED |
| RMRay Machine Company INC | Baltimore, MD | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| RSRed Star Yeast | Baltimore, MD | Food Manufacturing311942 | — | ◇ UNVERIFIED |
| RCReichhold Chem INC. | Baltimore, MD | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| RCReliable Contracting Company, INC. - Gambrills | Millersville, MD | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| RCReliable Contracting Company, INC. - Glen Burnie | Glen Burnie, MD | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| RBRockland Bleach & Dye Works | Baltimore, MD | Textile Mills313210 | — | ◇ UNVERIFIED |
| RIRockland Industries | Nottingham, MD | Textile Mills313310 | — | ◇ UNVERIFIED |
| RCRocktenn Cp, LLC | Curtis Bay, MD | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| RPRoebuck Printing | Baltimore, MD | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| SCSasol Chemicals (usa) LLC | Baltimore, MD | Chemical Manufacturing325110 | — | ◇ UNVERIFIED |
| SMSchlumberger Malco | Owings Mills, MD | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| SCSchuster Concrete Ready Mix Llc-guilford Rd | Jessup, MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SDSchuster, Daniel, INC. | Owings Mills, MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SASeaboard Asphalt Products Company | Baltimore, MD | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| SPSewell Plastics INC. | Havre De Grace, MD | Plastics and Rubber Products Manufacturing326160 | — | ◇ UNVERIFIED |
| SGS& G Concrete | Finksburg, MD | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| SCS&g Concrete Company | Odenton, MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SCS&g Concrete Edgewood | Edgewood, MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SWSherwin Williams Cleaning Solutions | Havre De Grace, MD | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| SUShire U.s. Manufacturing | Owings Mills, MD | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| SESignode Eastern Operations | Baltimore, MD | Plastics and Rubber Products Manufacturing326112 | — | ◇ UNVERIFIED |
| SISimkins Ind. INC. | Catonsville, MD | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| SCSolo Cup | Owings Mills, MD | Paper Manufacturing322215 | — | ◇ UNVERIFIED |
| SWSpecified Woodworking Corporation | Laurel, MD | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| STSurface Treatment Technologies | Halethorpe, MD | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| SISyngene International LTD. | Baltimore, MD | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| TTechalloy | Baltimore, MD | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| TFTechnical Finishers | Rosedale, MD | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| TETeledyne Energy Systems, INC. | Sparks, MD | Electrical Equipment, Appliance & Component Manufacturing335911 | — | ◇ UNVERIFIED |
| TGTexas Gulf Industries, INC. | Baltimore, MD | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| TSTextron Systems Corporation | Hunt Valley, MD | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| TSThe Sun Products Corporation | Baltimore, MD | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| TMThomas Manufacturing Corporation | Parkton, MD | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| THTulkoff Horseradish Frod | Baltimore, MD | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| UBUnilever Bestfoods | Baltimore, MD | Food Manufacturing311221 | — | ◇ UNVERIFIED |
| UCUnited Coatings | Baltimore, MD | Transportation Equipment Manufacturing336510 | — | ◇ UNVERIFIED |
| UIUnited Iron & Metal | Baltimore, MD | Primary Metal Manufacturing331419 | — | ◇ UNVERIFIED |
| UPUnited Parcel Service - Quad (mdqua) | Baltimore, MD | Machinery Manufacturing333292 | — | ◇ UNVERIFIED |
| UPUpm Pharmaceuticals, INC | Baltimore, MD | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| UWU.s. Water Services | Aberdeen, MD | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| VPValley Proteins, INC. | Baltimore, MD | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| VIValleywood Industries, INC. | Baltimore, MD | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
