You can easily insert an automatically updated stock quote for a specific company in a spreadsheet.
Here are the instructions:
On the Tools menu, click AutoCorrect options. (Use the Office button and Excel Options in 2007)
Click the Smart Tags tab and place a check beside Label data with smart tags.
Type in a Stock symbol (such as MSFT) in a cell. (The symbol must be in all caps)
Click outside of the cell.
Place your mouse cursor over the purple triangle in the lower-right corner of the cell. Click the arrow.
Click Insert refreshable stock price.
Select whether to insert the stock price on a new worksheet or in a specific area on your current worksheet.
You can refresh a stock quote price at any time by right clicking anywhere within your worksheet and selecting Data Range Properties. Enter a value for how often the stock quote price should be refreshed.