Foreign investors are sitting on losses after piling 532.1 billion yen ($4.9 billion) into Japanese stocks last week, the most in a year, amid mounting expectations for more stimulus from the Bank of Japan. Those hopes were dashed Thursday when Governor Haruhiko Kuroda held off on additional easing, sending the Topix index plunging to close 4.8 percent below where it settled at the end of last week.

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