| ADBD | California |
| Adbeat | California |
| Adbiz, Inc. | Florida |
| AdBlock | California |
| ADC Technologies, Inc. | Georgia |
| Adcellerant | |
| Adcetera | Texas |
| ADCO | South Carolina |
| AdColony | California |
| ADCOM | Arizona |
| ADCOM Business Health & Science, Inc. | California |
| AdCom Technologies, LLC | New Jersey |
| Adconga, Inc. | |
| Adcore, Inc. | |
| Adcotron EMS, Inc. | Massachusetts |
| Add Subtitle, Inc. | |
| ADD Systems | New Jersey |
| Add-ins.com, LLC | Delaware |
| Add3 | Washington |
| AddBloom Digital, LLC | |
| Adddicott Web | |
| Adden Energy | |
| Addend Analytics, LLC | New York |
| Addensure Media, LLP | |
| Addepar, Inc. | California |
| AddEvent, Inc. | California |
| AddexBio | California |
| Addicting Games | California |
| Addimmune | Maryland |
| AddingWell | |
| Addion | |
| Addionics | |
| Addis Energy | |
| Addisoft Consulting, Inc. | Texas |
| Addison | |
| Addison Clark | |
| Addison Computers | Louisiana |
| Addison Engineering, Inc. | California |
| Addison Hall Design, LLC | |
| AddisonTech | Pennsylvania |
| Additech, Inc. | |
| Addition | New York |
| Addition Therapeutics | |
| Additive Implants | Arizona |
| Addmaster Corporation | California |
| Addo | California |
| Addonis Technologies, Inc. | California |
| AddOptimization.com | California |
| Addsum Business Software, Inc. | Utah |
| Addteq, Inc. | New Jersey |