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

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.