| Iron Hill Brewery NJ | — | 0 | — | — |
| Iron Hill Construction Mgt. Co PA | Construction | 0 | — | A |
| Iron Horse Brewery WA | Manufacturing | 0 | — | A |
| Iron Horse Excavating, Inc SD | Construction | 0 | — | F |
| IRON HORSE EXCAVATION LLC ID | Construction | 0 | — | A |
| Iron Horse Tools, Inc TX | Mining & Extraction | 0 | — | C |
| Iron Junction Logistics NE | Transportation & Warehousing | 0 | — | A |
| IRON LION ENTRIES, LLC TN | Construction | 0 | — | F |
| Iron Man Steel LLC TX | Construction | 0 | — | A |
| Iron Mechanical, Inc. CA | Construction | 0 | — | F |
| Iron Moose Logistics LLC WI | Transportation & Warehousing | 0 | — | A |
| Iron Mountain AL | Transportation & Warehousing | 0 | — | A |
| Iron Mountain AZ | Information & Media | 0 | — | C |
| Iron Mountain CA | Information & Media | 0 | — | F |
| Iron Mountain CO | Information & Media | 0 | — | C |
| Iron Mountain CT | Transportation & Warehousing | 0 | — | A |
| Iron Mountain DE | Transportation & Warehousing | 0 | — | A |
| Iron Mountain FL | Transportation & Warehousing | 0 | — | A |
| Iron Mountain GA | Information & Media | 0 | — | A |
| Iron Mountain IL | Transportation & Warehousing | 0 | — | A |
| Iron Mountain IN | Transportation & Warehousing | 0 | — | B |
| Iron Mountain KS | Wholesale Trade | 0 | — | C |
| Iron Mountain MA | Transportation & Warehousing | 0 | — | A |
| Iron Mountain MD | Information & Media | 0 | — | F |
| Iron Mountain MI | Transportation & Warehousing | 0 | — | A |
| Iron Mountain MN | Transportation & Warehousing | 0 | — | A |
| Iron Mountain MO | Information & Media | 0 | — | D |
| Iron Mountain NC | Transportation & Warehousing | 0 | — | A |
| Iron Mountain NE | Transportation & Warehousing | 0 | — | D |
| Iron Mountain NJ | Administrative & Waste Services | 0 | — | C |
| Iron Mountain NV | Transportation & Warehousing | 0 | — | A |
| Iron Mountain NY | Information & Media | 0 | — | D |
| Iron Mountain OH | Transportation & Warehousing | 0 | — | A |
| Iron Mountain OR | Administrative & Waste Services | 0 | — | D |
| Iron Mountain PA | Transportation & Warehousing | 0 | — | A |
| Iron Mountain PR | Transportation & Warehousing | 0 | — | A |
| Iron Mountain SC | Transportation & Warehousing | 0 | — | A |
| Iron Mountain TN | Transportation & Warehousing | 0 | — | A |
| Iron Mountain TX | Information & Media | 0 | — | F |
| Iron Mountain UT | Transportation & Warehousing | 0 | — | A |
| Iron Mountain VA | Information & Media | 0 | — | B |
| Iron Mountain WA | Transportation & Warehousing | 0 | — | B |
| Iron Mountain Information Management Services, Inc. NH | Professional & Technical Services | 4 | $134,474 | — |
| Iron Mountain Information Management, LLC NH | Professional & Technical Services | 9 | $150,436 | — |
| Iron Mountain Trap Rock Co. WI | — | 0 | — | — |
| Iron Native Welding, LLC AZ | Manufacturing | 0 | — | A |
| Iron Oak Plumbing Inc CA | Construction | 0 | — | F |
| Iron Spike Brewing Company IL | Manufacturing | 0 | — | A |
| Iron Steed Harley-Davidson CA | Retail Trade | 0 | — | A |
| Iron Systems, Inc. CA | Professional & Technical Services | 4 | $162,242 | — |
