- Jackal Technologies Corporation
- Japan Aviation Electronics Industry, Ltd.
- Japan Communication Equipment Co., Ltd.
- Japan Electronics and Information Technology Industries Association
- Japan Radio Co., Ltd.
- K's sound create
- K. TOKIWA & CO., INC.
- Kawasaki Precision Machinery Ltd.
- KDDI Media Will Corporation
- KDDI R&D Laboratories Inc.
- Keisoku Giken Co., Ltd.
- KITAMURA MANUFACTURING CO., LTD.
- KOBA 2007(Korea E & Ex Inc.)
- KOMAMURA CORPORATION
- KORG Inc.
- Kowa Company, Ltd.
- KUPO CO., LTD.
- KYOCERA KINSEKI Corporation
- Laguna Hills, Inc.
- Laguna Hills, Inc.
- Lambda System Inc
- LEAD CO., INC.
- LEADER ELECTRONICS CORP.
- LSI JAPAN Co., LTD.
