| Janus PIM d.o.o. | |
| Jasob JavaScript Obfuscator | City of Zagreb |
| JS Mastery Pro | |
| Jupiter Software | Osijek-Baranja |
| K. G. Media d.o.o. | Istria |
| Kalelarga.net | City of Zagreb |
| Kalo.dev j.d.o.o. | City of Zagreb |
| Kamino Technologies d.o.o. | |
| Kapa-Spin d.o.o. | |
| Kapetanovic sistemi d.o.o. | City of Zagreb |
| Katapult promocija d.o.o. | |
| Kinetic d.o.o. | |
| King ICT | City of Zagreb |
| Kiosk studio | City of Zagreb |
| Klub mladih Split | |
| Kodeks d.o.o. | City of Zagreb |
| Kompro d.o.o. | Osijek-Baranja |
| Komteh d.o.o. | City of Zagreb |
| Komteh d.o.o. | |
| Konferencija Web::Strategija | City of Zagreb |
| KönigSoftWare | Vukovar-Srijem |
| Kontek d.o.o. | |
| KONTO d.o.o. | Požega-Slavonia |
| Kontra Agency | City of Zagreb |
| Kosinus | Koprivnica-Križevci |
| Krk sistemi d.o.o. | Primorje-Gorski Kotar |
| Kron d.o.o. | Split-Dalmatia |
| Kronos d.o.o. | City of Zagreb |
| KSU d.o.o. | City of Zagreb |
| Kuhada d.o.o. | City of Zagreb |
| Kvark d.o.o. | City of Zagreb |
| Kvark-projekt | |
| L33T | Zagreb |
| Lab2000 d.o.o. | |
| Labtera d.o.o. | City of Zagreb |
| Lagos Dubrovnik Ltd | Dubrovnik-Neretva |
| Laser Line d.o.o. | Istria |
| Lator d.o.o. | City of Zagreb |
| Laus CC d.o.o. | Dubrovnik-Neretva |
| Leapwise d.o.o. | |
| Lega d.o.o. | |
| Lelteh d.o.o. | City of Zagreb |
| Lemax d.o.o. | City of Zagreb |
| Libratel d.o.o. | City of Zagreb |
| Lloyds Digital | |
| Locatel d.o.o. | Istria |
| logicBRICKS | City of Zagreb |
| Logika d.o.o. | City of Zagreb |
| Logon d.o.o. | Varaždin |
| Lorijen | Osijek-Baranja |