I'm surprised Fidelity is on the list. Your retirement account might still own shares of X
They have a piece of almost every pie.
https://en.wikipedia.org/wiki/List_of_asset_management_firms
For example - DFJ (2010), the Al Saud family (2011), and Fidelity (2011).
In this case, these are minority investors restoring their ownership stake.
ETFs traded on exchanges and index funds is just very special setups. Which don't prevent other forms of funds that is essentially piles of money given out for them to manage often with limitations of pulling it out.