| iRobot Corporation | Massachusetts |
| Iron & Railings International,, Inc. | |
| Iron Bow Technologies | |
| Iron City SEO | |
| Iron io | California |
| Iron Monkey | Delaware |
| Iron Mountain, Inc. | Massachusetts |
| Iron Ox, Inc. | California |
| Iron Rebellion | |
| Iron Roots | Texas |
| Iron Software | |
| Iron Software, LLC | |
| Iron Systems, Inc. | California |
| Iron Will Games, LLC | Texas |
| Ironbridge Software | Illinois |
| Ironbridge Technologies, Inc. | Virginia |
| IronCAD, LLC | Georgia |
| Ironclad Marketing | |
| Ironclad, Inc. | |
| IronCore Labs, Inc. | |
| Ironfly | California |
| Ironhack | Florida |
| Ironhawk | California |
| Ironman Software, LLC | |
| IronMonk | New York |
| IronMountain Solutions, Inc. | Alabama |
| IronNet, Inc. | Virginia |
| IronOne Technologies, LLC | Texas |
| IronOne Technologies, LLC | |
| IronOrbit | California |
| Ironpaper | New York |
| Ironscales | Georgia |
| IronSource | California |
| Ironspring Ventures | Texas |
| IronVest, Inc. | New York |
| Ironwave Technologies, LLC | |
| Ironwood | |
| Ironwood Electronics | Minnesota |
| IroquoiSystems, Inc. | Alabama |
| Irradiated Software | Colorado |
| Irreducible, Inc. | |
| Irrigreen | |
| IRSLogics | Illinois |
| Irth Solutions, LLC | |
| Irvine Clinical Research | California |
| Irvine Compiler Corporation | California |
| Irvine Sensors Corporation | California |
| Irvine Valley College | California |
| IrvingDev | |
| irx, LLC | Washington |