| Helmcode | Santa Cruz de Tenerife |
| HelpMyCash, S.L.U. | Barcelona |
| Hemav Technology, S.L. | Barcelona |
| Hermes Ingeniería, S.L. | Valencia |
| Heuristik | Biscay |
| HeyTrade | |
| HF System | Valencia |
| High Design Virtual | Alicante |
| Highlight Therapeutics, S.L. | Valencia |
| Hiper Antena, S.A. | Madrid |
| Hipermaco, S.A. | Valencia |
| Hipernet | Málaga |
| Hirudesign | Álava |
| Hisdesat Servicios Estratégicos, S.A. | Madrid |
| Hispafuentes, S.L. | Toledo |
| Hispamax Technology, S.L. | Madrid |
| Hispanocom.com | Castellón |
| Hispasat | Madrid |
| Hispasec | Málaga |
| HispaSSL | Sevilla |
| Hispatek Internet | Gipuzkoa |
| Hispaweb | Madrid |
| Histocell | Biscay |
| Histocell | Biscay |
| Hobeen | Álava |
| Holaluz-Climdom, S.A. | Barcelona |
| HolaSoft | Santa Cruz de Tenerife |
| Holded | Barcelona |
| Hopla Software | Madrid |
| Horus Hardware, S.A. | Madrid |
| Hosco | Barcelona |
| Hostalia | Biscay |
| Hostarting | Gipuzkoa |
| Hostenlinea Networks | Madrid |
| Hostgren.com | Málaga |
| Hostigal | A Coruña |
| HostiSoft, S.L. | A Coruña |
| Hostytec | Valencia |
| HPC Now! | Barcelona |
| HSBC en España | |
| HSI, S.L. | Barcelona |
| HTTP Toolkit | Barcelona |
| Hubbub Labs | |
| Hubtype | Barcelona |
| Human Level Communications, S.L.U. | Alicante |
| Humanox | Cádiz |
| Husk Ventures, S.L. | Barcelona |
| HV Sistemas, S.L. | Madrid |
| Hydrae | Madrid |
| i Latina Software, S.L. | Madrid |