Manufacturers:
- Kaise Electric Works Ltd
- Kantronics
- Kawai Music Instruments
- Kay Elemetrics Corp.
- Keithley
- Kelvin
- Kenmore
- Kenpro
- Kenwood
- Kepco
- Kern & Sohn GmbH
- Kikusui Electronics Corporation
- Kingshill
- Kirisun Communications
- KitchenAid
- KLM electronics
- Knight-Kit
- Kodak
- Konika
- Kontron Elektronik GmbH
- Korg
- Krohn-Hite Corporation
- Kurz-Kasch
- Kurzweil Music Systems
- KW Communications
- Kyocera
- Kyoritsu Electrical Instruments
