| IDS Consulting | New York |
| IDS NM | New Mexico |
| IDS Software | California |
| IDScan.net | Louisiana |
| IDScanner.com | New York |
| IDSecurityonline.com | New York |
| idSoftware Identification Management Systems, LLC | Georgia |
| IDT Biologika | Maryland |
| IDT Corporation | New Jersey |
| IDT messaging, Inc. | New Jersey |
| IDT Partners | New York |
| IDV.net | Pennsylvania |
| IDX Group, Inc. | Massachusetts |
| Idyllic Software | Colorado |
| IEA Software, Inc. | Washington |
| IEC | Colorado |
| iECURE, Inc. | Pennsylvania |
| iEditWeb, Inc. | Florida |
| IEEE | New York |
| IEEE Computational Intelligence Society | |
| IEEE Computer Society | District of Columbia |
| IEEE Consultants' Network of San Diego | California |
| IEEE Engineering Medicine and Biology Society | |
| IEH Laboratories and Consulting Group | |
| iENGINEERING | Virginia |
| iEntry, Inc. | Kentucky |
| iePlexus, Inc. | Washington |
| IERUS Technologies, Inc. | Alabama |
| IES, Inc. | Montana |
| IESD, Inc. | New York |
| IET Labs, Inc. | New York |
| IEX Cloud Services, LLC | New York |
| IEX Group, Inc. | |
| Ifactory | Massachusetts |
| IFC Studios | |
| iFeeltech IT Services | Florida |
| iFetch | |
| Iffel International, Inc. | California |
| iFIT Prosthetics, LLC | Wisconsin |
| iFIT, Inc. | Utah |
| iFixit | |
| iFlex | |
| Iflexion | Colorado |
| iFlip Investors, Inc. | Wyoming |
| IFM Therapeutics, LLC | |
| iFocus Consulting, Inc. | Oregon |
| IFS Technologies | Tennessee |
| IfThen Digital, LLC | |
| IFTTT | California |
| iFuel Interactive | New York |