Bloomberg Billionaires Index is a daily ranking of the world's billionaires published by Bloomberg News since March 2012. It tracks the 500 wealthiest people in the world.[1] The ranking was designed to provide a more transparent and accountable presentation of the world's biggest personal fortunes.[6] At first, the index only tracked the 20 richest people in the world, and then expanded to 100, 200, 400 and later 500 in October 2016.[7]