IMO, it’s going to be in the thousands to 10’s of thousands. Depending on what organizations you exclude and if you’re considering total assets vs net assets vs liquid assets etc.
There’s a surprising number of individual buildings worth 1+ billion each of which are going to be their own org. Add pensions, trusts, nuclear reactors, large dams, government organizations, etc.
If its 200/100,000,000, that would be 99.9998 or 2 more digits.