| Home PC | Gauteng |
| Hospitality Solutions | Western Cape |
| Host4Africa.com | Gauteng |
| Hostingkzn | KwaZulu-Natal |
| Hostitworld | KwaZulu-Natal |
| Hostking | |
| HostworX | |
| Hotwireless | Gauteng |
| HP South Africa | Gauteng |
| HP Store South Africa | Gauteng |
| HS Web Development | Free State |
| HSC Systems | Gauteng |
| HTI (Pty) Ltd | Gauteng |
| htxt.africa | Gauteng |
| Hub Host | Western Cape |
| Huge Networks | Western Cape |
| Huge Telecom | Gauteng |
| HybridClouds | Western Cape |
| Hymax | Western Cape |
| HyperionDev | Western Cape |
| Hyrax Biosciences | Western Cape |
| i-Consulting | Western Cape |
| I-Soft Solutions (Pty) Ltd | Western Cape |
| I-Systems | Gauteng |
| i-TEAM (Pty) Ltd | Gauteng |
| I-Tech Solutions | KwaZulu-Natal |
| I.R. Pope & Sons (Pty) Ltd | Western Cape |
| i1Solutions | Western Cape |
| I3 Zone Development | Western Cape |
| iAdapt | Gauteng |
| Ianko's gis page | Gauteng |
| iBanza | Western Cape |
| IBIS Consulting | Gauteng |
| IBIS Technology (Pty) Ltd | Western Cape |
| Iclix | Free State |
| Icon Era | Eastern Cape |
| iConnect SA | Gauteng |
| iConnection | Gauteng |
| iCreations | Gauteng |
| Idea Camp | Western Cape |
| Idea Power | Gauteng |
| Idea-Catalyst | Western Cape |
| Ideco Group Ltd | Gauteng |
| IDoWebsites | |
| iDS Hosting | Western Cape |
| IDS Secure | Western Cape |
| IDU | Western Cape |
| IEDM Digital Marketing | Gauteng |
| IEWC | Gauteng |
| iFactor | Gauteng |