KEY POINTS
  • The move marks a major blow for the U.S. tech giant, as it seeks to convince authorities that the deal will benefit competition.
  • Shares of Activision Blizzard slumped 10% in U.S. premarket trading.

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LONDON — Britain's top competition regulator on Wednesday moved to block Microsoft's acquisition of video game publisher Activision Blizzard.

The measure marks a major blow for the U.S. tech giant, as it seeks to convince authorities that the deal will benefit competition. Microsoft said it plans to appeal the decision.

In this article