SoftBank Group Corp. tumbled to a loss in the December quarter, weighed down by a drop in the value of the Vision Fund’s public holdings, just as Masayoshi Son campaigns to raise $500 billion for the Stargate artificial-intelligence project.

SoftBank reported a net loss of nearly $2.4 billion for its fiscal third quarter, with another quarter in the red for its once-heralded Vision Fund unit. The Vision Fund unit, famed for its investment in startups including Uber and DoorDash,

SoftBank Group posted a surprise quarterly loss Wednesday and the Japanese company's revenue also missed analysts' estimates.

By Anton Bridge TOKYO (Reuters) -Japanese technology investor SoftBank Group booked a surprising net loss of 369.2 billion yen ($2.4 billion) in the October-December quarter as valuations at its Vision Fund investment arm fell.