| Arsenal Health | |
| Arsenal Medical | Massachusetts |
| Arsenal PC | Ohio |
| Arshem Web Solutions | Indiana |
| Art & Logic, Inc. | California |
| Art Blocks, Inc. | |
| ART Compass | California |
| Art Dude Creative | Tennessee |
| Art Labs | Delaware |
| Art of Computers | Arizona |
| Art Science Resarch Laboratory, Inc. | |
| Art Shobey Interactive | North Carolina |
| Art Systems, LLC | New York |
| Art Wave, Inc. | Georgia |
| Art101 Design & Digital Imaging | California |
| Art2Hire, LLC | California |
| Arta Finance | California |
| Artax Biopharma | |
| Artbase, Inc. | New York |
| ARTBIO, Inc. | Massachusetts |
| ARTdesign | California |
| ArtDevDesign | |
| ArtDriver, LLC | District of Columbia |
| Artech Consulting Group, Inc. | Florida |
| Artech House | Massachusetts |
| ArteDigital | California |
| Artefact Design, Inc. | Massachusetts |
| Artek Mfg, Inc. | California |
| Artel, LLC | Virginia |
| Artella Software, Inc. | |
| Artelo Biosciences, Inc. | California |
| Artelon | Georgia |
| ARTÉMIA Communications, Inc. | California |
| Artemis | Georgia |
| Artemis Consultants | Ohio |
| Artemis Design Ltd | Illinois |
| Artemis Health, Inc. | Utah |
| Artemis Networks, LLC | California |
| Artemis Space | |
| Artemis Ward | |
| Artera | California |
| ArteraAI | California |
| Arterburn.com | Kentucky |
| Arteris, Inc. | California |
| Artery Therapeutics, Inc. | |
| Artesyn Embedded Technologies | Arizona |
| Artha Solutions | Arizona |
| Arthena | |
| Arthrex, Inc. | Florida |
| Arthritis Innovation Corporation | |