Searchlight Capital Partners, a private equity firm, completed an investment in Mainstream Fiber Networks, a broadband services provider. Financial terms were not disclosed. “We are excited to partner with Mainstream to help the Company build on its successful track record of bringing broadband service to communities throughout the state of Indiana. By building out best-in-class and scalable next-generation fiber networks throughout Indiana, Mainstream is positioned to help hundreds of thousands of unserved and underserved homes and businesses gain access to quality, high-speed broadband," Darren Glatt, Searchlight Partner.