The biggest backers of SoftBank Group Corp.¡¯s gargantuan Vision Fund are reconsidering how much to commit to its next investment vehicle as an oversized bet on flexible workspace provider WeWork sours.

Saudi Arabia¡¯s Public Investment Fund, which contributed $45 billion to the $100 billion Vision Fund, is now only planning to reinvest profits from that vehicle into its successor, according to sources familiar with the talks.

Abu Dhabi¡¯s Mubadala Investment Co., which invested $15 billion, is considering paring its future commitment to below $10 billion, the sources said, asking not to be identified in disclosing internal deliberations.