New Delhi, April 8 -- Asia's richest billionaires, including Gautam Adani, Mukesh Ambani, others cumulatively lost nearly $46 billion on India's 'Black Monday' on April 7, as markets across the region continued to fall in the wake of President Donald Trump's tariff announcements.

Tencent Holdings Ltd. co-founder Pony Ma lost $6.8 billion, or 12% of his total wealth. In India, infrastructure tycoon Gautam Adani slid by $4.2 billion. Robin Zeng, the Hong Kong battery billionaire, dropped $4.1 billion, reported Bloomberg.

Collectively, the world's 20 richest individuals saw a cumulative $45.9 billion wiped out from their fortunes, according to the Bloomberg Billionaires Index, as the MSCI Asia Pacific Index tumbled as much as 8.5%.

India'...