Castik Capital, a European private equity firm, completed its acquisition of AddSecure, a European provider of premium solutions for secure data and critical communications, from Abry Partners. Abry Partners will maintain a minority ownership position. Financial terms were not disclosed. "We are thrilled that AddSecure will be joining our family of portfolio companies and to have this opportunity to work closely with the company's management team. We are impressed by their journey and look forward to accelerating and promoting AddSecure's on-going success," Michael Phillips, Castik Capital Partner.