| HiMedia Deutschland AG | North Rhine-Westphalia |
| Hintenaus | Bavaria |
| Hinterleitner Design | Baden-Württemberg |
| HiQ-Store Alsdorf GmbH | North Rhine-Westphalia |
| Hirschsiegel GmbH | Bavaria |
| HIS Hanse IT Systeme GmbH | |
| HIS WebShop | North Rhine-Westphalia |
| Hiscox SA | Bavaria |
| HiSolutions AG | Berlin |
| Hitachi Automotive Systems Espelkamp GmbH | North Rhine-Westphalia |
| Hitachi Ventures GmbH | |
| HitBit music & disc media GmbH | Baden-Württemberg |
| hitcap esports GmbH | |
| HiTec Zang GmbH | North Rhine-Westphalia |
| Hitex GmbH | Baden-Württemberg |
| Hive Technologies GmbH | |
| Hivebuy | |
| Hivebuy GmbH | |
| HiveMQ GmbH | |
| hivr solutions GmbH | |
| HIWIN GmbH | Baden-Württemberg |
| HK Computerdienst GmbH | Lower Saxony |
| HK Meßsysteme GmbH | Berlin |
| HK-Orga Christian Welslau | North Rhine-Westphalia |
| HKN GmbH | North Rhine-Westphalia |
| HKP Office Solution GmbH | |
| HKS Informatik GmbH | |
| HKS Netzwerksysteme Gmbh & Co. KG | North Rhine-Westphalia |
| HKS-Consulting GmbH | North Rhine-Westphalia |
| HKS-Systems GmbH | Bavaria |
| HM technologies GmbH | Bavaria |
| hm-netzwerke GmbH | |
| HM-Sat GmbH | Bavaria |
| HMC - Hamburg Mobile Computing UG (haftungsbeschränkt) & Co. KG | |
| HMC Market Consulting | |
| HMC Systemhaus OHG | North Rhine-Westphalia |
| HMD-Software AG | Bavaria |
| HME Industrieelektronik GmbH | Bavaria |
| HMF-IT UG (haftungsbeschränkt) | Lower Saxony |
| hmi Informatik GmbH | Baden-Württemberg |
| HMKW Hochschule für Medien, Kommunikation und Wirtschaft GmbH | Berlin |
| hmmh multimediahaus AG | Bremen |
| HMNC Brain Health | |
| HMS GmbH | Bavaria |
| HN Electronic Components GmbH & Co. KG | Hesse |
| HNC-Datentechnik GmbH | North Rhine-Westphalia |
| hns hardware netzwerke software GmbH | |
| hnw consulting GmbH | |
| ho.Systeme GmbH & Co. KG | |
| HOAI.de | Hesse |