| Arck | Oregon |
| ArcLight Capital Partners, LLC | Massachusetts |
| ArcLight Information Technology, LLC | Massachusetts |
| Arcor Electronics | Illinois |
| Arcoro | Arizona |
| Arcotek | |
| Arcpoint Global, LLC | Colorado |
| ArcScan | Colorado |
| Arcserve (USA), LLC | Minnesota |
| ArcSite | Michigan |
| ArcSoft Corporation | California |
| ArcStone | Minnesota |
| ARCSys | Virginia |
| ARCTEK Satellite Productions, LLC | |
| Arctic Information Technology, Inc. | Alaska |
| Arctic Pixel | Alaska |
| Arctic Semiconductor | |
| Arctic Slope Telephone Association Cooperative | Alaska |
| Arctic Wolf Networks, Inc. | California |
| Arctiq | |
| ArcTouch | California |
| Arctrieval, Inc. | |
| Arctrieval, Inc. | |
| Arcturus Capital | California |
| Arcturus Studios Holdings, Inc. | |
| Arcturus Studios Holdings, Inc. | |
| Arcturus Therapeutics, Inc. | |
| Arcube | Texas |
| Arcus Biosciences, Inc. | California |
| Arcus Ventures | New York |
| Arcutis Biotherapeutics, Inc. | |
| Arcweb Technologies, LLC | Pennsylvania |
| Arcwise | California |
| Arda Therapeutics | |
| Ardan Labs | |
| Ardan Scientific | New Jersey |
| Ardas International, Inc. | California |
| Ardelyx | Massachusetts |
| Ardent Creative | |
| Ardent Learning, Inc. | New York |
| Ardent Management Consulting | Oklahoma |
| Ardigen | California |
| Ardour Capital Investments, LLC | |
| Ardoz Digital, Inc. | |
| Arduino | |
| ARE Telecom & Broadband | Minnesota |
| Are You On Page 1 | |
| ARE-ON | Arkansas |
| Are.na | New York |
| Area 1 Security | California |