Fitbit lost nearly 9 points of market share in Q4 2016 YoY but continues to hold position as the world's largest wearables vendor, followed by Xiaomi on the low end, and then Apple, as the gap between these top three players continues to narrow. Our report tracks core global wearable shipments and marketshare by hardware vendor by quarter. It can be used by device makers, component suppliers, operators, software developers, content suppliers and other stakeholders to determine the size of the main global wearables market.