9. PHD Virtual
CEO: James Legg
PHD Virtual, a Philadelphia-based vendor, works with VMware and Citrix environments to provide backup and monitoring of physical, virtual and cloud environments. Earlier this month PHD Virtual bolstered its portfolio by acquiring VirtualSharp, a cloud disaster recovery startup. PHD Virtual also announced a $4 million round of funding led by Insight Venture Partners and Citrix, the original investors in the startup.