US stock index Nasdaq Composite fell 4.4% on Wednesday, the most since 2011, erasing almost $33 billion from the fortunes of technology's 61 richest people, according to Bloomberg Billionaires Index. The world's richest person, Amazon's Jeff Bezos lost $8.2 billion, while Facebook CEO Mark Zuckerberg dropped $3.2 billion. Google co-founders Larry Page and Sergey Brin lost a combined $4.5 billion.