- Athen Chimenti
- Athena Venture Advisors
- ATMOS Inc.
- atom
- ATTAX Financial Service and Tax Advisory
- atxart
- AudioVideoMedia
- Audrey DiGiovanni
- August Sun Projects
- Austin Moland
- Australian Online Solutions Pty Ltd
- Auto Intelix
- Auto Training
- AutoExcel Reporting Solutions
- Automation Project Group
- Autumn Home
- Avalon Dive Center
- Avenue D & East 39th, LLC
- Avi Bass
- Avi Dey
- Avinash Anandan