| IXcellerate | |
| J-Phone | |
| JavaScript.info | Moscow |
| JavaScript.ru | |
| Job4j.ru | |
| Joomla! Россия | Moscow |
| Joomla-Code | Moscow |
| Joomla-lesson | Moscow |
| Joomlaportal.ru | Moscow |
| JoomlaTune | Moscow |
| JSC Gazprom Space Systems | Moscow |
| JSC RAMAX International | Moscow |
| JSC «SATIS-TL-94» | |
| JustHost.ru | |
| JustWork | |
| Kama Flow | |
| Kanobu | |
| KANSoftware | Moscow |
| KeepSoft | Moscow |
| KG Kosmik Group | Sverdlovsk |
| Khabarovsk State University of Economics and Law | Khabarovsk |
| Kick Ecosystem | |
| King Bird Studio | |
| Kiosksoft | Moscow |
| Kipod | Moscow |
| Kmsoft | Moscow |
| Kns neva | Saint Petersburg |
| Knutov.net | Perm |
| Komsomolsk-Na-Amure State University | Khabarovsk |
| KonnektU | |
| Kors-Soft | Moscow |
| Körting | |
| KORUS Consulting | Saint Petersburg |
| KPISOFT | Moscow |
| KSoft Group | Moscow |
| Kubsoft | Moscow |
| KursHub | |
| Kuzbass | Novosibirsk |
| KVAZAR | Moscow |
| Kviku | |
| Labmedia | |
| Laboratory of Adaptive Optics of M.V. Lomonosov Moscow State University | Moscow |
| Landgraph | Moscow |
| Lanit-Tercom | |
| Lansecurity | Moscow |
| Laravel Russian Community | |
| Laser Systems Ltd | Saint Petersburg |
| LeadHit | |
| LEANTech | |
| LearnatHome | |