4. Pluribus Networks
CEO: Robert Drost
Based in Palo Alto, Calif., Pluribus Networks bills itself on its website as a vendor of "hardware-accelerated network virtualization for private and public cloud data centers." Using a combination of software and hardware, Pluribus Networks aims to provide a platform for cloud and big data apps.
Pluribus Networks has raised more than $44 million in venture capital funding to date, from investors including Menlo Ventures, New Enterprise Associates and China Broadband Capital, among others.