New Delhi, Sept. 28 -- Mark Zuckerberg's estimated fortune has fallen by nearly $20 billion in two trading sessions as a sharp decline in Meta Platforms shares fuels investor concerns over the enormous cost of its artificial intelligence investments.

Mark Zuckerberg's wealth dropped $10.9 billion, or 4.23%, to $246.7 billion on Monday, taking his estimated fortune below the $250 billion mark, according to Forbes' Real-Time Billionaires list.

The fall followed an $8.9 billion decline on Friday, when Meta shares dropped after Goldman Sachs warned about the scale of spending required by major technology companies to build AI infrastructure.

The decline in Zuckerberg's wealth is closely linked to Meta's share price. He owns about 13% of th...