[jononor]

Companies run the world. Many are as large as entire countries, and have huge influence over large aspects of peoples lives - from media, to food, to medicine, etc. That makes it in the publics interest to have insights into how they are controlled. Follow the money.

[smsm42]

Controlling and investing are completely different things. Control is exercised by the board and the management, and these are pretty much universally public for a large company. However, investment does not have to come with a seat on the board - a large one can, and then, again, it would be public, but it doesn't have to. You seem to confuse entirely different things.