| Kanlli | Madrid |
| Kanoar Ventures, S.G.E.I.C, S.A. | Valencia |
| Kantaronet.com | A Coruña |
| Kanteron Systems, S.L.U. | Valencia |
| Kantox Ltd | Barcelona |
| Kanzen Design | Madrid |
| Karakana Factoría TIC, S.L. | Pontevedra |
| KaukaVR | Gipuzkoa |
| Kedu Cooperativa | Barcelona |
| KeepMeReady, S.L. | Murcia |
| Keifi Technologies | Madrid |
| Keiretsu Forum Spain | Barcelona |
| Keld | Zaragoza |
| Kenmei Technologies | Valencia |
| Kepar | Zaragoza |
| Kerionics | Valencia |
| Kern Pharma | Barcelona |
| KeyZell | Sevilla |
| Kibo Ventures | Madrid |
| Kierke Desarrollo Web, S.L. | Barcelona |
| Kimaldi | Barcelona |
| Kimia Solutions, S.L. | Madrid |
| Kineox Solutions, S.L. | Madrid |
| King of App | Lleida |
| KingEclient | Barcelona |
| Kintai | Barcelona |
| Kirab | Barcelona |
| klicap - ingeniería del puzle, S.L. | Sevilla |
| Klik & Spik | Madrid |
| Kloov | Barcelona |
| knowCentury | Madrid |
| Koa Health | Barcelona |
| Komunika Digital | Álava |
| Konecta Group | Madrid |
| Kontrol Web | Valencia |
| Koonstel | Barcelona |
| KOR multimedia | Burgos |
| Korku Soft | A Coruña |
| Korra Studio | Biscay |
| Kraken Informática | Valencia |
| Krama e-soft, S.A. | Madrid |
| Krasis.com | Pontevedra |
| Kreanto Services | Castellón |
| Kriter Software | Barcelona |
| KRSolutions | Madrid |
| Kymatio | Madrid |
| Kymos Group | Barcelona |
| L'Agence CDRS | Málaga |
| L.A.B. CIRCUITS, S.A. | Barcelona |
| L.A.S.E.R., S.L. | Santa Cruz de Tenerife |