BC Partners, Canada Pension Plan Investment Board and other co-investors have agreed to sell a 70 percent stake in Suddenlink Communications to Altice S.A. The transaction implies a total enterprise value of about $9.1 billion for Suddenlink. Once the deal closes, BC Partners and CPPIB will each receive $960 million in proceeds and a vendor note of about $200 million. CPPIB and BC Partners will each retain a 12 percent stake in the company. St. Louis-based Suddenlink is the seventh-largest cable system operator in the United States. LionTree Advisors acted as financial advisor to Suddenlink.