| ASAccurate Screen Printing | Denver | CO | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| AIAccu-type, INC. | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
 Acme Foundry INC | Denver | CO | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| AMAdams Mcclure | Denver | CO | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| AMAdams Mcclure - Inca Street | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| AAdplex | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ACAerr CO | Denver | CO | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| ALAfgo Laboratories INC | Denver | CO | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| AIAggregate Industries - Wcr INC | Denver | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| AIAggregate Industries - Wcr, INC. | Denver | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ADAirgas Denver Asu | Denver | CO | Chemical Manufacturing325212 | — | ◇ UNVERIFIED |
| ACAjax Custom Plating Company | Denver | CO | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| AOAlameda Ornamental Iron | Denver | CO | Furniture and Related Product Manufacturing337124 | — | ◇ UNVERIFIED |
| AOAlameda Ornamental Iron | Denver | CO | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| APAlert Polishing & Plating | Denver | CO | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| ATAllied Trades INC Dba Allied Steel CO | Denver | CO | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| APAll Phase Coatings LLC. | Denver | CO | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| ALAlpha Labs INC | Denver | CO | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| ABAmerican Blackline Coatings INC | Denver | CO | Petroleum and Coal Products Manufacturing324122 | — | ◇ UNVERIFIED |
| AWAmerican Web INC | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| AAnacomp | Denver | CO | Miscellaneous Manufacturing339999 | — | ◇ 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 |
| AGAspen Graphics, INC. | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| AMAtlas Metal & Iron CORP | Denver | CO | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| AMAtlas Metals & Iron CORP Processing .cn | Denver | CO | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| APAuraria Printing | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ACAuto Chlor System | Denver | CO | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| AHAuto Haus of Colorado Dba Trailer Made Custom Trailers LLC | Denver | CO | Transportation Equipment Manufacturing336214 | — | ◇ UNVERIFIED |
| BRBacker Rod Mfg. | Denver | CO | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| BPBarnum Printing + Publishing CO | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| BCBasalite Concrete Products | Denver | CO | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| BIBasf Inmont CORP. | Denver | CO | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| BBB&b Blending INC | Denver | CO | Nonmetallic Mineral Product Manufacturing327213 | — | ◇ UNVERIFIED |
| BBB&b Blending LLC | Denver | CO | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| BCB-d Chemical | Denver | CO | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BPBeiler Printing | Denver | PA | Printing and Related Support Activities323119 | — | ◇ UNVERIFIED |
| BMBenjamin Moore & CO | Denver | CO | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| BWBest Way Printing | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| BRBg Retail - Redfield Rifle Scopes Bldg | Denver | CO | Machinery Manufacturing333310 | — | ◇ UNVERIFIED |
| BOBioenergy of Colorado | Denver | CO | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| BOBioenergy of Colorado Ii, LLC | Denver | CO | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| BFBlue Flame Services, LLC | Denver | CO | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| BCBoyer Coffee CO | Denver | CO | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| BLBpi-westminster, Llc(owner)/arcadis (op) | Denver | CO | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| BRBrannan Ready Mix Company | Denver | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BSBrannan Sand & Gravel | Denver | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| BLBrite-line LLC - Brite-line LLC | Denver | CO | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| BRB & R Screen Graphics | Denver | CO | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
