| Kama Flow | |
| Kanobu | |
| KANSoftware | Moscow |
| kaverin.studio | |
| Kazan Innovation University named after. V.G. Timiryasova | |
| Kazan National Research Technical University named after A.N. Tupolev | |
| 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 |
| Kolomna Institute of Moscow Polytechnic University | |
| Komsomolsk-Na-Amure State University | Khabarovsk |
| KonnektU | |
| Kors-Soft | Moscow |
| Körting | |
| KORUS Consulting | Saint Petersburg |
| KPISOFT | Moscow |
| Krylov State Research Centre | |
| 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 | |
| Ledas Ltd | Novosibirsk |
| Legsoft | Moscow |
| Lenvendo Soft LLC | Saint Petersburg |
| Leta Capital | Moscow |
| Life Pay | |
| Lighttek Software | Sverdlovsk |
| Like | Moscow |
| Link-soft | Moscow |
| Linksoft | Moscow |
| Linux Format | Moscow |