| Console | Novosibirsk |
| Content Labs | Moscow |
| Continent Telecom | Moscow |
| Contour Maps | Moscow |
| CoolUtils | Moscow |
| CPS | Moscow |
| CPS Labs Ltd | Mari El |
| CreateInstall | Moscow |
| CreativeSOFT | Moscow |
| Creators | |
| CREDO Consulting | |
| CredoDesign | Sevastopol |
| Crosstech Solutions Group | |
| CrowdSystems | |
| Crypto Bazar | |
| Crystal Office Systems | Moscow |
| Crystal Rich Ltd | Saint Petersburg |
| Cubase.su | Moscow |
| Cusoft | Moscow |
| Cyber Polygon | Moscow |
| CyberFT | |
| Cyberian.tech | |
| CyberLife | Moscow |
| Cyberslab | |
| CyD Software Labs | Rostov |
| CYPIX | |
| Cпутниковое оборудования в Калуге | Kaluga |
| Da Vinci Capital LLC | Moscow |
| Daniil One | |
| Danilin.biz | |
| DaOffice | |
| Data East, LLC | Novosibirsk |
| DataArmor | |
| DataFabric | |
| Dataforce | Moscow |
| DATARC | |
| Datatel | |
| DATUM Soft | |
| DC Lite | |
| DDosEXPERT | Moscow |
| Deliver | |
| Delphi Russian Knowledge Base | Moscow |
| DeltaSoft Computing, Inc. | Moscow |
| Dental Soft | Moscow |
| Dephan, LLC | |
| Destiny.Games | |
| Devexperts | Saint Petersburg |
| Devpractice | |
| DI Group | Moscow |
| Didan | Moscow |