Other than doing a long and exhaustive title search, not sure how any outsider would be able to know.
If the titles (public record) have been ingested into OpenAI - it may be able to give you some part pieces to guess
e.g.
*How many unique owners have a Disney title between XXX and 2019?
*How many unique owners have a title purchased from Disney between 2019 and today?
*How many unique owners have a title purchased from a non Disney party between 2019 and today?)
- Lots of data imperfections there (accounting for sales, owners with purchases before and after 2019, are unique owners really unique, etc - but may get you directionally correct number.