KEY POINTS
  • The bidding process will officially begin on Friday evening and comes to end on the following day.
  • The auction will settle a drawn-out bidding war between some of America's biggest media companies.
  • A takeover auction for such a high-profile public company is very rare.

Twenty-First Century Fox and Comcast are heading for an auction to settle a takeover of British broadcaster Sky.

The bidding process will officially begin on Friday evening and comes to end on the following day, the U.K.'s Takeover Panel said Thursday, with a maximum of three rounds to decide the fate of the deal. Each bid must be made in cash.