- K&L Microwave
- K&M Electronics, Inc.
- KD Components, Inc.
- KDI/Triangle Corp.
- KDS America
- Kemet
- Kepco, Inc.
- Keystone Electronics Corp.
- Kikusui Electronics Corp.
- Kingbright
- Klove Electronics bv
- KOA Speer
- Korea Electronics ( KEC )
- Kooltronic, Inc.
- Krypton Isolation, Inc.
- KW Microwave
- Kycon
- Kyocera
- Kyocera
