| AIAggregate Industries - Wcr, INC. | Denver, CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| AIAggregate Industries Wcr INC Franktown Ready Mix Plant | Franktown, CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| AIAggregate Industries - Wcr INC. Gun Club Ready Mix Plant | Aurora, CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| AIAggregate Industries - Wcr, INC. -havana | Aurora, CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| ADAirgas Denver Asu | Denver, CO | Chemical Manufacturing325212 | — | ◇ UNVERIFIED |
| AIAirgas Intermountain, INC | Henderson, CO | Machinery Manufacturing333912 | — | ◇ 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 |
| APAlcoa Packaging Machinery | Englewood, CO | Machinery Manufacturing333513 | — | ◇ UNVERIFIED |
| APAlert Polishing & Plating | Denver, CO | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| ACAllegro Coffee CO | Thornton, CO | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| ATAlliant Techsystems INC | Littleton, CO | Chemical Manufacturing325920 | — | ◇ 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 |
| ACAlpine Custom Shutters INC. | Englewood, CO | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| APAlpine Printing Incorporated | Arvada, CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ARAlpine Roastery, INC. | Englewood, CO | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| ASAlpine Steel Fabricators | Simla, CO | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| ATAlternative Tech - Formerly Owned By Hp | Englewood, CO | Computer and Electronic Product Manufacturing334118 | — | ◇ UNVERIFIED |
| ASAmato Shutter & Door CO | Englewood, CO | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| ABAmerican Blackline Coatings INC | Denver, CO | Petroleum and Coal Products Manufacturing324122 | — | ◇ UNVERIFIED |
| ASAmerican Stainless Steel CORP | Englewood, CO | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| AVAmerican Variseal CORP | Broomfield, CO | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| AWAmerican Web INC | Denver, CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ACAmes Construction Inc.cn | Aurora, CO | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| AAnacomp | Denver, CO | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ARAndesite Rock Company | Henderson, CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ 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 |
| 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 Co, INC | Henderson, CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ASAsphalt Specialties CO INC - 6555 Huron | Denver, CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ 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 |
| 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 |
| BCBasalite Concrete Products | Denver, CO | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| BIBasf Inmont CORP. | Denver, CO | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
