Apple recently introduced in the Numbers spreadsheet the ability to pull live stock prices from the internet, making it now possible to track portfolio performance.
To access this feature, you use the STOCK function:
Since the feature pulls data from the Yahoo finance service, the symbols you should use for reference are those used at Yahoo. For most stocks that I’ve come across, the symbols are the same as those used at Google, but they do seem to vary slightly for non-US stocks and currencies.
To track the Euro/USD exchange rate, the symbol used at Yahoo is “EURUSD=X”, but using this symbol in the Numbers STOCK function returns an error. The solution, as I found in this discussion at Apple is to use the CURRENCY function: