Only if they sell them then it is income from sale of business investment, otherwise it SHOULD show up on the balance sheet. They seem to show consolidated statements so it should be on the quarterly report, but under the assets of the balance sheet section. I didn't notice it on the last one, but they would list it as some sort of investment, they may not list the name of companies.
I am an accounting student as well as finance, and worked in accounting at a bank during high school, but I am not sure how they would list this, maybe Stratey could shed light. for GAAP (assuming they follow it) do you list market value for ownership in other companies, or is the mark to market rule apply? I cannot imagine they value the companies at what they THINK they can sell it for.