| The Able Agency, Inc. | |
| The Academy of South Florida | Florida |
| The Acumen Group | New York |
| The AD Agency | |
| The Ad Farm, LLC | |
| The AD Firm | |
| The AD Leaf Marketing & Advertising Firm, LLC | |
| The Ad Spark | |
| The Addison Group | Virginia |
| The Advantage Software Company | North Carolina |
| The Advantage Software Company, Inc. | North Carolina |
| The AEC Associates | |
| The AEgis Technologies Group | Alabama |
| The Aerospace Corporation | |
| The Affordable Web Guy, LLC | Colorado |
| The Agency Angle | |
| The Agency Guide | |
| The AI Conference | California |
| The AIS Group, Inc. | California |
| The Alchemists, LLC | |
| The Algebra Project, Inc. | Massachusetts |
| The Algorithm | |
| The Allen Group | Connecticut |
| The Alliance Center | Colorado |
| The Ambitious, Inc. | Massachusetts |
| The AME Group | Indiana |
| The American Academy | |
| The American Logo | |
| The Amp Hour Electronics Podcast | |
| The Ancon Group, LLC | Maryland |
| The Anderson Agency | |
| The Angelus Corporation | Wisconsin |
| The Annet Group | New York |
| The Antibody Society | |
| The App Creaters | |
| The App Founders | |
| The App House, LLC | Illinois |
| The App Vortex | |
| The Appops | |
| The Apps Pro | |
| The Apptitude | |
| The ARCO Group, Inc. | Florida |
| The ARRC | |
| The Art and Antique Information Network, Inc. | Florida |
| The Art of Charm, Inc. | |
| The Art of Online Marketing | |
| The Artemis Fund | Texas |
| The Atlas | |
| The Atomic Birdhouse | Colorado |
| The Aurora Funds, Inc. | North Carolina |