| Harzer Software Dipl.-Ing. Rico Harzer | Hesse |
| Hasenbein Software GmbH | North Rhine-Westphalia |
| HaSoTec GmbH | Mecklenburg-Vorpommern |
| Hasso-Plattner-Institut für Digital Engineering gGmbH | Brandenburg |
| hatscher.digital media GmbH | North Rhine-Westphalia |
| HAUBER-Elektronik GmbH | Baden-Württemberg |
| Hauck & Drozdowski Internetforum GbR | Baden-Württemberg |
| Hauptstadt Medien | Berlin |
| Haus & Gross it.services GmbH | Saarland |
| Haus Hoppe | Hesse |
| Haus iT Service & Vertrieb Mentor GmbH | North Rhine-Westphalia |
| haus neuer medien GmbH | Hesse |
| Haus Weilgut GmbH Computer Conception | Baden-Württemberg |
| Hausgold | |
| Hausheld AG | |
| HausmeisterSystem24 | |
| Haveldata GmbH | Brandenburg |
| HAWA Hans Wagner GmbH | Baden-Württemberg |
| Hawk AI GmbH | |
| HB-Internetservice GmbH & Co. KG | Hesse |
| HBB Datenkommunikation & Abrechnungssysteme GmbH | Lower Saxony |
| HBS Electronic GmbH | Baden-Württemberg |
| Hbsites Solutions GmbH | North Rhine-Westphalia |
| hc media GmbH | Lower Saxony |
| HCS EDV-Systeme GmbH | Baden-Württemberg |
| HCT-Computer-Technologie Hildesheim GmbH | Lower Saxony |
| HCTec | Lower Saxony |
| HD Überwachungskamera Service | Saxony |
| HD Vision Systems | |
| HD-System GmbH | |
| HDL-Online | Saxony-Anhalt |
| HDNET GmbH & Co. KG | North Rhine-Westphalia |
| HDS-Software GmbH | Bavaria |
| HDWebdesign | Bavaria |
| HE-Electronic Systems GmbH | Mecklenburg-Vorpommern |
| HEADQUARTERS Cologne | North Rhine-Westphalia |
| Headroom | |
| Headup Games GmbH & Co. KG | North Rhine-Westphalia |
| HealthCaters UG | |
| HealthMe | |
| HeapStack GmbH | |
| Heartbeat Labs GmbH | |
| Heartbeat Medical | Berlin |
| Heartwebdesign | |
| HeavenHR GmbH | |
| HEBAtec | Hesse |
| Hebel Consulting GmbH | Bavaria |
| HEC Electronic Vertriebs GmbH | Baden-Württemberg |
| HEC GmbH | |
| Heckner Electronics GmbH | |