superfirm

/ˈsupərˌfɜrm/
noun
  1. A very large and powerful company or organization, often formed by merging several smaller firms.
    • The merger created a superfirm that dominated the global market for electronics.
    • The superfirm's influence was so great that it could shape government policies in its favor.
    • Many small law practices joined together to form a superfirm that could handle international cases.