SoftBank Group’s Vision Fund injected at least $400m into Greensill Capital at the end of last year, according to people familiar with the matter, deepening the potential losses the giant tech investor faces in the startup’s collapse.

The infusion of cash was in addition to the $1.5bn the Vision Fund had invested in Greensill in 2019. The money, not previously reported, was used as a financial backstop when another Vision Fund company, construction startup Katerra, came close to defaulting on a loan to Greensill, the people said.