| AMS Software | Moscow |
| Andreevsoft | Moscow |
| Andrey Mirron | Moscow |
| Angelic Software | Sverdlovsk |
| Angels IT Group | |
| ANSystem Company Ltd | Moscow |
| Antikvarus.ru | |
| Antivirus.ru | Moscow |
| Anypc.ru | Moscow |
| AO Kaspersky Lab | Moscow |
| Apasscraker | Saint Petersburg |
| Aplaut | |
| AppCraft | |
| AppFox | |
| Applied Research Center for Computer Networks | Moscow |
| Appricot | |
| AppTractor | |
| Aptamerlab | |
| Aquarisu Software | Moscow |
| Arch Linux | Moscow |
| Ardinvest | Crimea |
| ARena Space | |
| ArimSoft | Moscow |
| Arity.ru | Novosibirsk |
| Arma Coworking | |
| ARQA Technologies | Moscow |
| Art web | Moscow |
| Art-Soft | Moscow |
| Artezio LLC | Moscow |
| Artflasher | Novosibirsk |
| Artics Internet Solutions | Moscow |
| ArtofWeb | Kaluga |
| Artox Media Digital Group | |
| Artsurf | |
| ArwShop | Moscow |
| ASCON | |
| Asmo Media Group | |
| Assist | |
| Astra Linux | Moscow |
| Astrakhan State University | Astrakhan |
| ASTRIO | |
| ATC - Semiconductor devices | Saint Petersburg |
| AtDisk Software | Nizhny Novgorod |
| Atrise | Voronezh |
| Aurora | |
| Automechanics, inc. | Moscow |
| AVS Consulting | Moscow |
| AVT-Техника | Moscow |
| Axmor | Novosibirsk |
| Axoft | Moscow |