Last year, Nintendo saw a massive spike in stock value when they announced that they were teaming up with DeNA to release five mobile games. Conversely, the company's value took a plunge when Nintendo announced that their first mobile app, Miitomo, would be delayed. Miitomo is out now, and interest is high early on. The social app was downloaded over 1 million times in three days, topping Japan's iOS and Android charts. As a result, Nintendo's stock jumped up by 8% today, pushing the company's market cap to ¥2.34 trillion, or around $21 billion.
Source: Google Finance