Company profiles and links to respective websites are alphabetically listed.
* Companies including "NTT" as part of their name are listed with "NTT" omitted.
- HALEX CORPORATION
- Harbour MSP Holdings Pte. Ltd.
- Harbour MSP Pte. Ltd.
- Harbour MSP Pty Limited
- HKNet Company Limited
- NTT HOKKAIDO TELEMART CO., LTD.
- NTT HOMETECHNO CORPORATION
- Hotel Technology Pty Ltd
- HTCL Holdings Ltd.
- NTT Human Solutions Corporation