Given the footnote above, how much did Berkshire pay for American Express stock on an average per share basis? answer: $1,287

What is the 12/31/18 market value of American Express stock on a per share basis? answer: $14,452

The American Express stock price at 12/31/19 was $124.49 per share. How will the change in the stock price affect Berkshire Hathaways 2019 financial statements assuming they dont buy or sell any stock during the year? answer: The share value of the stock would increase the value of the stock.

What is the realized gain or loss if Berkshire sold 100 shares of American Express on 1/2/20 when the stock price is $125.85 per share? answer:

Can someone confirm if I'm interpreting the footnote correctly?

Below we list our fifteen common stock investments that at yearend had the largest market value. We exclude our Kraft Heinz holding - 325,442,152 shares - because Berkshire is part of a control group and therefore must account for this investment on the "equity" method. On its balance sheet, Berkshire carries its Kraft Heinz holding at a GAAP figure of $13.8 billion, an amount reduced by our share of the large write-off of intangible assets taken by Kraft Heinz in 2018. At yearend, our Kraft Heinz holding had a market value of $14 billion and a cost basis of $9.8 billion. Below we list our fifteen common stock investments that at yearend had the largest market value. We exclude our Kraft Heinz holding - 325,442,152 shares - because Berkshire is part of a control group and therefore must account for this investment on the "equity" method. On its balance sheet, Berkshire carries its Kraft Heinz holding at a GAAP figure of $13.8 billion, an amount reduced by our share of the large write-off of intangible assets taken by Kraft Heinz in 2018. At yearend, our Kraft Heinz holding had a market value of $14 billion and a cost basis of $9.8 billion