| AVAmerican Variseal CORP | Broomfield | CO | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| AWAmerican Web INC | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ASAmertech Spray Finishing | Colorado Springs | CO | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| ADAmetek Dixson | Grand Junction | CO | Computer and Electronic Product Manufacturing334513 | — | ◇ UNVERIFIED |
| AAnacomp | Denver | CO | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ASAndersen's Sales & Salvage INC | Greeley | CO | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| ARAndesite Rock CO | Longmont | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| ARAndesite Rock Company | Henderson | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| AHApcna Holdings LLC | Denver | CO | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
 Archer Daniels Midland Company | Denver | CO | Food Manufacturing311313 | — | ◇ UNVERIFIED |
| AIArctic Insulation INC | Greeley | CO | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| APArriba Poles, LLC | Arriba, 2.5 Mi W of | CO | Wood Product Manufacturing321114 | — | ◇ UNVERIFIED |
 A. R. Wilfley and Sons, INC. | Denver | CO | Machinery Manufacturing333911 | — | ◇ UNVERIFIED |
| AGAsarco Globe Plant | Denver | CO | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| ASAscent Solar | Denver | CO | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| ACA&s Const CO | Salida Area | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ADAspen Design Works, LLC | Carbondale | CO | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| AGAspen Graphics, INC. | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ACAsphalt Constructors - Port. Genset 3028 | Alamosa Area | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| APAsphalt Paving CO | Golden | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| APAsphalt Paving Company | Golden | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ASAsphalt Specialities CO INC | Henderson | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ASAsphalt Specialties - 62nd Ave | North Washington | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ASAsphalt Specialties- As-3 Asphalt Plant | Idaho Springs, 2.8 Mi E of | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ASAsphalt Specialties -erie Hma Facility | Erie | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ASAsphalt Specialties - Nelson Mining Reso | Firestone | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ASAsphalt Specialties - Road 6 Asphalt Pla | Erie | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ASAsphalt Spec- Moble Recycle Plant #2 | Firestone | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| AMAtlantic Manufacturing & Logistics LLC - Hudson | Hudson | CO | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| AMAtlas Metal & Iron CORP | Denver | CO | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| AMAtlas Metals & Iron CORP | Denver | CO | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| AOAurora Organic Dairy High Plains | Gill | CO | Food Manufacturing311511 | — | ◇ UNVERIFIED |
| AHAuto Haus of Colorado Dba Trailer Made Custom Trailers LLC | Denver | CO | Transportation Equipment Manufacturing336214 | — | ◇ UNVERIFIED |
| ACAvient CORP - Advanced Composites-gordon | Montrose | CO | Plastics and Rubber Products Manufacturing326130 | — | ◇ UNVERIFIED |
| ACAvx CORP | Colorado Springs | CO | Computer and Electronic Product Manufacturing334414 | — | ◇ UNVERIFIED |
| BCBach Composite Colorado, INC | Fort Lupton | CO | Transportation Equipment Manufacturing336510 | — | ◇ UNVERIFIED |
| BRBacker Rod Mfg. | Denver | CO | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| BSBae Systems Space & Mission Systems INC - Wmr2 | Westminster | CO | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| BPBarnum Printing + Publishing CO | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| BOBartkus Oil CO | Longmont | CO | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| BOBartkus Oil CO | Boulder | CO | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| BCBasalite Concrete Products | Denver | CO | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| BRBasalt Roofing INC. | Carbondale | CO | Petroleum and Coal Products Manufacturing324122 | — | ◇ UNVERIFIED |
| BIBasf Inmont CORP. | Denver | CO | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| BCBasin Co-op, INC. - See 0670241 | Durango | CO | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| BHBaxter Healthcare -solvent Usage | Parker Area | CO | Computer and Electronic Product Manufacturing334510 | — | ◇ UNVERIFIED |
| BBB&b Blending INC | Denver | CO | Nonmetallic Mineral Product Manufacturing327213 | — | ◇ UNVERIFIED |
| BBB & B Printing CO | Wheat Ridge | CO | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| BMBear Metal Corp. | Golden | CO | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| BMBedrock Marble & Granite, INC. | Longmont | CO | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
