SoftBank Group Corp.¡¯s Vision Fund is planning deep cuts in staffing after reporting about $18 billion (?1.94 trillion) in losses from the declining value of its startups, according to people familiar with the matter.

The reductions could affect about 10 percent of the fund¡¯s workforce of roughly 500, said two of the people, who asked not to be identified discussing personnel decisions. The Vision Fund¡¯s headquarters are in London, with additional operations in Tokyo and California. The cuts will be across all levels of staff, said one person.

A spokesman for the Vision Fund declined to comment.