I'm not familiar with some of these names on here, but Microstrategy is one of the few that actually owns the bitcoins they hold. Entries like Grayscale or Mt Gox own bitcoin on behalf of others, so there's no conclusion to be drawn from them holding it.
We do not even know if that company really holding more than 10000 bitcoin.
Even if they claim that they holding that amount, but without showing their wallet address that holds that amount, we do not have to trust it.
Let them saying like that while we can do our business to get more bitcoin in many ways, so we do not have to miss the chance to sell bitcoin at the highest price.
I am not familiar too with that list, so I do not overthink about them because what I am concern about now is I need to make a profit in bitcoin before it is too late for me to have many bitcoin.