| NXT Soft | |
| O2 Slovakia, s.r.o. | Bratislava |
| OBS.sk | |
| Octopus online, s.r.o. | |
| Office for Personal Data Protection of the Slovak Republic | Bratislava |
| okto.digital, s.r.o. | |
| Onlima | |
| OnOffline | Bratislava |
| Opal Multimedia, spol. s r.o. | |
| Opea Systems, s.r.o. | |
| Open IT, s.r.o. | |
| Optimalizaciaseo.sk | Bratislava |
| Orange Slovensko, a.s. | Bratislava |
| Orderlord | |
| ORIW, s.r.o. | Nitra |
| Oriwin, s.r.o. | Žilina |
| ORKA systems | |
| Outloud | |
| OxyNet | Trnava |
| Pageconception Ltd | Banská Bystrica |
| Panax Co., s.r.o. | |
| Paneurópska vysoká škola | Bratislava |
| Pantheon.tech, s.r.o. | Bratislava |
| Papaya POS, s.r.o. | |
| Paravan Interactive, s.r.o. | Bratislava |
| Partner Soft, spol. s r.o. | |
| Patie Web Studio | Prešov |
| PC Služba | Bratislava |
| PC team, spol. s r.o. | Banská Bystrica |
| PC-KLINIKA, s.r.o. | Bratislava |
| PCmania.sk | Trenčín |
| Pecrea.com | Žilina |
| Perifer Computers | Nitra |
| PHC | Bratislava |
| Photoneo, s.r.o. | |
| Photoshopbook.net | Bratislava |
| Pix Creative | |
| Pixla.eu | Trenčín |
| PIxwell, s.r.o. | |
| PK - Systems, s.r.o. | |
| Platin Telecom, s.r.o. | |
| Platon Technologies | Bratislava |
| PMXnet | |
| Polysoft | Košice |
| PosTel DS, s.r.o. | Bratislava |
| Powerful Medical, Inc. | |
| Preklady Advans | Nitra |
| Prešovská univerzita v Prešove | Prešov |
| ProCeS, s.r.o. | Banská Bystrica |
| Procurio, s.r.o. | |