Japan's SoftBank Group booked a surprise $2.4 billion quarterly loss on Wednesday, hit by a decline in the value of e-commerce platform Coupang and other tech companies held by its Vision Fund investment arm.

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 Corp. swung to losses for the December quarter due to a drop in the value of the Vision Fund’s public holdings, boding ill for founder Masayoshi Son who has to raise $500 billion for the Stargate artificial-intelligence project.

Japanese investor SoftBank Group Corp’s tech-focused Vision funds reported an investment loss of $2.3 billion (352.7 billion yen) for the quarter ended December. This loss was attributed to the decline in the stock price of some of its public investments,