Rakuten Drops on $900 Million Deal to Buy Viber Message App

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Rakuten Inc., the Japanese online retailer controlled by billionaire Hiroshi Mikitani, plummeted in Tokyo trading after announcing it will buy the Viber Internet messaging and calling service for $900 million.

Rakuten fell 9.5 percent, the most in more than four months, to close at 1,499 yen in Tokyo trading, wiping out more than $2 billion in market value.