Nintendo shares plunged by 18 percent, the most since 1990 after the Pokemon GO app was released in Japan.
Nintendo’s stock had initially doubled when the app first debuted.
That stock went down when people learned that the company has just a thirteenth percent stake in the app.
In just seven days, Pokemon GO has reached 10 million downloads, the fastest ever for any mobile app, according to a report from research firm Sensor Tower.
Pokemon GO has been downloaded more than 30 million times since it launched earlier this month.
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