The world’s 400 richest people lost $182 billion this week from their collective fortunes as weak manufacturing data from China and a rout in commodities sent global markets plunging.

The weekly drop for the Bloomberg Billionaires Index, a group that includes Warren Buffett and Glencore Plc’s Ivan Glasenberg, was the biggest since tracking of the expanded list began in September 2014. The combined net worth of the index members fell by $76 billion on Friday alone, when the Standard & Poor’s 500 Index of U.S. stocks ended its worst week since 2011.

“For them that’s a fractional percentage, even though $182 billion is a big number,” said John Collins, director of investment advisory at Aspiriant, which oversees more than $8 billion for high net worth clients. “A week like this feels really bad, but when you take a step back, in a big picture view it’s not a disaster by any means.”