A rise in Nintendo's stock may be a hint to a future event.
Nintendo is expected to hold an event related to the 3DS on September 13, Bloomberg reports.
The report mentions that investors have learned about this event, causing Nintendo's stock to rise 9.7%.
The Tokyo Game Show will take place later that week. From September 15 through the 18, several Japanese game companies will show off their latest games to the public. While it is expected that some of them will have 3DS, DS and Wii software to show, Nintendo has traditionally opted out of showing any new efforts.