- Caddock
- Cal-Chip
- Cal Crystal Labs / Comclok
- Calex Mfg. Co., Inc.
- Caliber Electronics
- C&K Components
- California Eastern Labs
- California Micro Devices
- Camcar Division of Textron
- Canare Corp. of America
- Captive Fastener Corp.
- Cardinal Components
- Carlingswitch
- Carlo Gavazzi
- Catalyst Semiconductor
- Caton Connector Corp.
- C-Cube Microsystems
- Celeritek, Inc.
- Celestica, Inc.
- Centaur Technology
- Central Semiconductor Corp.
- Centro Vision, Inc.
- Century Interconnect Products
- Century Microelectronics, Inc.
- Ceramic Magnetics, Inc.
- Cera-Mite Corp.
- Champion Technologies
- Champlain Cable
- Channel Microwave Corp.
- Cherry Corp.
- Chicago Miniature Lamp
- Chip Express
- Chips and Technologies
- Chromatic Research, Inc.
- Chomerics
- Chrontel
- Cinch Connectors
- CINOX Corp.
- CIN-TRAN, Inc.
- Circuit Assembly Corp. (CA)
- Circuit Components, Inc.
- Cirrus Logic
- Citel, Inc.
- Clarostat
- Classic Coil
- Clear Logic, Inc.
- C-MAC
- CMD Technology, Inc.
- CMP Enclosures
- Coaxial Components Corp.
- Coilcraft
- Coils Electronic Co.
- Coiltronics
- Cole Hersee Co.
- Cologne Chip Designs
- Comair/Rotron
- ComCore Semiconductor
- Comlinear
- Comm Con Connectors, Inc.
- Commonwealth Sprague
- CommQuest Technologies, Inc.
- CommScope
- Communication Techniques, Inc.
- Compensated Devices, inc.
- Component Equipment Co., Inc.
- Components Corp.
- Computer Products, Inc.
- Concord Electronics Corp.
- Condor Power Supplies
- Conec Corporation
- Connecting Devices, Inc. (CDI)
- Connor-Winfield
- Consumer Microcircuits Limited (CML)
- Continental Device India Ltd.
- Contraves Intersys AG
- Control Devices, Inc.
- Cooler Master
- CoolRISC (CSEM SA)
- Corcom
- Cornell Dubilier
- Cosel USA
- Coto Relays
- CP Clare
- Crosslink Semiconductor
- Crydom
- Crystaloid
- Crystal Semiconductor/Cirrus Logic
- Crystek Corp.
- CTS Corp.
- Custom Power Systems
- Cutler-Hammer
- CyberTouch
- Cyntec Co., Ltd.
- Cypress Semiconductor
- Cyrix
