The poor results have dented investor confidence in founder Masayoshi Son's big bets on new start-ups.
Addressing a news conference, Son said
"We have caused a lot of concern," Son said, adding he needs to "give everyone a piece of mind" to secure outside funds for Vision Fund 2.
The tech conglomerate on Wednesday reported operating income of 2.59 billion yen ($23.6 million) for the three months ended in December, a plunge of 99% compared to the same period a year earlier.
SoftBank founder and CEO Masayoshi Son's closely watched $100 billion Vision Fund was the biggest driver of those losses. The Vision Fund and a related fund reported an operating loss of 225 billion yen ($2 billion) for the quarter, blaming unrealized losses in WeWork and Uber for the hit.