Alpha Magnetic Spectrometer (AMS-02) is a general purpose high energy particle detector which was successfully deployed on the International Space Station on May 19, 2011. It conducts a unique long duration mission of fundamental physics research in space. To date the detector collected over 32 billion cosmic ray events. Among the physics objectives of AMS are a search for understanding of Dark Matter, Antimatter, the origin of cosmic rays and the exploration of new physics phenomena. The recently published positron fraction up to 350 GeV measured by AMS-02 will be presented.