Marlin Equity Partners LLC bought Total Defense Inc., a subscription-based endpoint security software provider, for an undisclosed sum.

The private equity firm will integrate Total Defense with its portfolio company AppRiver LLC, which provides cloud-based cybersecurity and productivity services.

AppRiver aims to become a one-stop cybersecurity provider with the Total Defense merger and acquisition of Roaring Penguin Software Inc., an anti-spam and antivirus product developer, in March.

Marlin, which has more than $6.7 billion of capital under management, targets software, technology, healthcare, services and industrial technology industries.