Nintendo shares soared on Monday after its new augmented reality mobile app, Pokemon Go, burst out of the gate over the weekend in the U.S and in key markets around the globe. The company's shares rose 36 percent in two days, after downloads of the Pokemon Go app raced to the top of iOS and Android charts in the U.S. The wave of demand exceeded expectations, said Morgan Stanley MUFG analyst Mia Nagasaka, in a note to investors. "Especially noteworthy is that there were no aggressive marketing campaigns prior to the app going live," she wrote.