To get the sum for F4 you need to multiply D4 and E4, that will give the total of the initial cost, and do the same thing for D4 through F12.
To get the Current Value you need to add the Initial Cost and the Current Price Per Share and that is going to give the the total to get the Current Value.
To get the Gain/Loss you need to subtract the Current Value from the Initial Cost and will give the Gain/Loss.
To get the Percent of the Gain/Loss you have to take the Gain/Loss and subtract the Initial Cost from it.