How can you tell how many stocks a company owns?

Answer 1

The publish financial statements if they are publically traded on the stock exchange. It should be in their reports. They could say they have a 10% interest or a controlling interest and you would have to do the math based on the number of outstanding shares. Remember some shares could be issued but not sold. Read carefully.

Answer 2

If you are talking about a mutual fund, they send out reports quarterly or annually, but the number of stocks they own can change day by day so no number would be totally accurate by the time you see it.