Dell

Dell is an American multinational computer technology company based Texas, United States, that develops, sells, repairs, and supports computers and related products and services.

Sophos

Sophos Group plc is a British security software and hardware company. Sophos develops products for communication endpoint, encryption, network security, email security, mobile security and unified threat management.

HP

The Hewlett-Packard Company or Hewlett-Packard was an American multinational information technology company headquartered in Palo Alto, California.