| ArgSoft Group, LLC | New York |
| Argus | Massachusetts |
| Argyle Systems, Inc. | |
| ARH Media Solutions | Ohio |
| Arhue | |
| ARiA | Virginia |
| Aria CV, Inc. | Minnesota |
| Ariadne Network | Washington |
| Arial Software | Arizona |
| Ariana Pharmaceuticals | |
| Ariba, Inc. | California |
| Aridis Pharmaceuticals, Inc. | |
| Arieca | Pennsylvania |
| Ariel Feldman | Illinois |
| Ariel Link | New York |
| Ariel Precision Medicine | Pennsylvania |
| Ariel Ventures, LLC | Ohio |
| Ariel Web Design | Minnesota |
| Aries Capital Partners | Utah |
| Aries Electronics, Inc. | Pennsylvania |
| Aries Graphics International | California |
| Aries Systems Corporation | Massachusetts |
| Aries Technology, Inc. | Arizona |
| Ariesnet, Inc. | Texas |
| Ariesoft | New York |
| Arietis | Massachusetts |
| Ariglad, Inc. | |
| Arillic | |
| Arima Genomics | California |
| ariMarketing | |
| Arimo | California |
| Arimor | Virginia |
| Arine, Inc. | |
| Arintra | Texas |
| Ario | California |
| Arion Marketing, LLC | |
| Arionkoder | Massachusetts |
| Arisan Therapeutics, Inc. | |
| ArisGlobal | Massachusetts |
| ARISING Group, Inc. | New York |
| Arista Biologicals | Pennsylvania |
| Arista Consulting, LLC | |
| ARISTA Corporation | California |
| Arista Networks, Inc. | California |
| AristaMD, Inc. | |
| Aristos Ventures | Texas |
| Aristotle Circle, Inc. | |
| Aristotle, Inc. | District of Columbia |
| Arius DSP, Inc. | Tennessee |
| Arivoo Technologies | Arizona |