SoftBank Group is in talks to acquire the 25% stake in Arm it does not directly own from Vision Fund 1 (VF1), a $100 billion investment fund it raised in 2017, according to people familiar with the matter, potentially delivering a win for investors who have waited years for strong returns.

The discussions come as SoftBank, which currently owns 75% of Arm, is preparing to list the chip designer on Nasdaq next month at a valuation of $60 billion to $70 billion.

If the negotiations lead to a deal, the Japanese tech investor would be delivering a major, immediate windfall to VF1 investors, including Saudi Arabia's Public Investment Fund and Abu Dhabi's Mubadala. They nursed losses after many of SoftBank's bets on startups such as workspace provider WeWork and ride-sharing firm Didi Global soured.