Is it both Blackstone and Blackrock? I have seen threads on both companies. I’m fairly certain Blackstone was a spin-off of Black Rock and is a separate company for a number of years.
The only Blackstone company I have given money to, indirectly through a retailer, makes a very nice griddle.
This article refers to BlackStone. You are correct about the relationship between the two. https://www.difference101.com/blackrock-vs-blackstone/