Private equity firms Clearlake Capital Group and Siris Capital agreed to invest $400m in Constant Contact, a cloud-based digital marketing company. "Constant Contact is one of the most well respected and recognized franchises in all of digital marketing and is poised to benefit from a number of significant growth drivers in the near-term. We believe that this investment will provide the management team with significant resources to rapidly bolster the go-to-market organization and make large-scale investments in the product platform," James Pade, Clearlake Partner.