Clearlake Capital completed the acquisition of an additional 50% stake in Constant Contact, a cloud-based marketing software platform, from Siris Capital, a private equity firm. Financial terms were not disclosed. "We invested in Constant Contact in 2021 to reinvigorate a long-standing digital marketing leader following its carve-out from Endurance International Group. CEO Frank Vella and the entire Constant Contact team have made significant progress towards this objective, and we look forward to Constant Contact achieving continued success moving forward," Tyler Sipprelle, Siris Partner.