| AccentSoft | Saint Petersburg |
| ACE Laboratory | Rostov |
| Acropolis Computer Systems | Saint Petersburg |
| ActiveCloud | Moscow |
| AdAstrA Research Group Ltd | Moscow |
| Adcamp | |
| AddVenture | Moscow |
| AddVenture | |
| ADEM | Moscow |
| ADTester | Novosibirsk |
| Advalange | |
| Advanced XML Converter | Volgograd |
| AdvancedUser | Moscow |
| Advanta.org | Moscow |
| ADVSoft | Rostov |
| AG Telecom | Moscow |
| Agensoft | Moscow |
| AgentApp | |
| Agisoft, LLC | |
| Agora | |
| AiData.me | |
| AIM Tech | Moscow |
| AimCom | |
| AIMP | Moscow |
| Alee Software Co. Ltd | Saint Petersburg |
| Alef Bank | |
| Alfa-Elektronik | Nizhny Novgorod |
| Alianshop | Moscow |
| Alive Games, Inc. | Saint Petersburg |
| All-Soft.net.ru | Moscow |
| All4net.ru | Moscow |
| Allsiemens.com | Moscow |
| Allsoft.ru | Moscow |
| Alm Works | Saint Petersburg |
| Almazov National Medical Research Centre | |
| Alpha-Soft | Moscow |
| Alpom | Saint Petersburg |
| ALT Linux | Moscow |
| AltaIR Capital | Moscow |
| Altcraft, LLC | |
| AltegroSky | Moscow |
| AlterGeo | Moscow |
| AlternativaGames Ltd | Perm |
| AlterWind Software | Penza |
| Alto Vision | |
| Alyo.ru | Moscow |
| AM Software | Moscow |
| AM'SOFT - Andrew Maltsev Software | Moscow |
| Amlab | |
| AMS Software | Moscow |