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Cabletron Systems, Inc. (Enterasys/Riverstone)
Cambium Networks, Ltd.
Carbonite, Inc.
Certeon, Inc.
Cetacea Networks Corp.
Chantry Networks, Inc. (Siemens)
Charlotte's Web Networks
Check Point Software Technologies Ltd.
Checkmarx Ltd.
Cisco Systems, Inc
Citrix Systems, Inc.
Cloudmark, Inc.
Code42 Software, Inc.
Colubris Networks
comforte AG
Compaq Corp. (HP)
Connectware (formerly Acsys)
CoSine Communications, Inc.
Coyote Point Systems, Inc.
cPacket Networks
C-Phone Corporation
CR Systems
Cray Communications
Crescendo Networks, Inc.
CrossComm (Olicom/Madge)
Crytica Security
Cubro
Cylink Corporation
Cymtec