The world's fastest growing source of megawealth hit a speed bump this year.

The 128 people in Asia with enough money to crack the 500-member Bloomberg Billionaires Index lost a combined $137 billion in 2018, the first time wealth in the region has dropped since the ranking started in 2012.

Global trade tensions and concerns that stock valuations are too frothy hammered some of the area's biggest fortunes. China's tech sector was hit particularly hard, while India and South Korea weren't spared. The declines occurred even as banks and money managers aggressively stepped up efforts to cater to Asia's richest.