Company profiles and links to respective websites are alphabetically listed.
* Companies including "NTT" as part of their name are listed with "NTT" omitted.
- Japan Information Processing Service Co.,Ltd.
- Japan Mobilecasting,Inc.
- JBIS Holdings, Inc
- JIP InoBridge Co.,Ltd.
- JIP Techno Science Corporation
- JQ Network Pte Ltd
- JSF INFORMATION TECHNOLOGY CO.,LTD.
- JSOL Corporation