Here is how it works:

• enter the date of your purchase in the field 'Acquisition date'
• enter the number of shares in the field «Shares»
• if you now click he button «Calc», this tool will look up the closing price of the stock
  on the day of your purchase, in order to calculate the return on your investment
  uptil today
• if you bought your stock at a different price than the closing price, you can
  overwrite the field «Price» with the actual price that you paid
• you can also benchmark the performance of your Swisscom stock against the
  relevant indices: the Dow Jones World Telecom Index, the Dow Jones European
  Telecom Index and the Swiss Market Index. These reference can be selected
  individually, but also in combination

Indices:

• DJWT: Dow Jones World Telecom Index
• DJET: Dow Jones European Telecom Index
• SMI: Swiss Market Index