March 9 (UPI) -- Amazon founder and CEO Jeff Bezos, already regarded as the world's richest person, saw his fortune rise another $30 billion since the start of 2018.
Most of Bezos' wealth, estimated at the start of the year to be about $112 billion, comes from ownership of Amazon stock. Its value has increased about 50 percent in the past six months and added about $10 billion to his net worth in the first two weeks of 2018. The year-to-date change thus far is $30.1 billion, the Bloomberg Billionaires Index indicates.