Nintendo and DeNA Stocks Plummit More Than 10% After Investor Briefing, Lose $2.48 Billion in Market Cap

[Miyamotoo]

This is because of delay of mobile game, things probably will back in normal once Nintendo release first game.
http://www.bloomberg.com/news/articles/2015-10-30/nintendo-mobile-game-delay-triggers-4-5-billion-drop-in-value