We dont know because Softbank no longer breaks out those number in 2018/2019. But they do give some insight into the level of growth so we could extrapolate from previous year or quarters.

And generally speaking Softbank ( and ARM ) refuse to comment on anything about ARM China.

But that is a good point, it is a potential risk or at least need to be mindful in its valuation.

FWIW Arm still files accounts in the UK (apparently for the Group).

https://find-and-update.company-information.service.gov.uk/c...

Latest is 2020/21. Profits down to £7m due to higher R&D and other expenses.