| kkNET | Silesian |
| KLL | Silesian |
| Klonex-VCS PUH Sp. z o.o. | Opole |
| Klub Internetowy Garinet | Lesser Poland |
| kminek.pl | Lesser Poland |
| KMprojekt | Pomeranian |
| Knapsack Sp. z o.o. | |
| KnowledgeHub Starter Sp. z o.o. | |
| Kodernia | Masovian |
| Kogena Sp. z o.o. | |
| Kogito Ventures | |
| KOLNET Sp. z o.o. | Silesian |
| Koltech Sp. z.o.o. | |
| Koma Nord Sp. z o.o. | Pomeranian |
| KOMBOTECH Sp. z o.o. | |
| Komisja Nadzoru Finansowego | |
| Kompa Sp. z.o.o. | Lublin |
| Kompas | Lublin |
| Kompex | Lesser Poland |
| Kompix | West Pomeranian |
| Komplus | Masovian |
| Kompmar | Silesian |
| Kompu-Art Studio Komputerowe | Greater Poland |
| Koncept Sp. z o.o. | Masovian |
| Konica Minolta Business Solutions Polska Sp. z o.o. | Masovian |
| KONTEL Sp. z o.o. | Masovian |
| Kontomatik Sp. z o.o. | |
| Kontomierz.pl | |
| Kontrast Systemy Komputerowe | Silesian |
| Kony Systemy IT | Warmian-Masurian |
| KOPnet S.C. | Silesian |
| Korbank | Lower Silesian |
| Koszalin Linux Users Group | West Pomeranian |
| KOTI Sp. z o.o. | Pomeranian |
| KP Labs Sp. z o.o. | |
| KP Labs Sp. z o.o. | |
| Krajowa Szkoła Administracji Publicznej im. Prezydenta Rzeczypospolitej Polskiej Lecha Kaczyńskiego | |
| Krakowski Park Technologiczny Sp. z o.o. | Lesser Poland |
| Kreatik Sp. z o.o. | |
| Kreator | Subcarpathian |
| Krop Informatyka | West Pomeranian |
| Krople Internetu | Silesian |
| KRT-NET | Lower Silesian |
| Kserkop Sp. z o.o. | |
| Ksi.pl Sp. z o.o. | Lesser Poland |
| ksiezyc.pl | Łódź |
| KSM Vision | |
| KUD.pl | Lesser Poland |
| Kwant S.C. | Świętokrzyskie |
| Kylos Sp. z o.o. | Łódź |