To find your Initial Cost you have to multiply the Initial Price Per Share multiplied by Shares.
F4=D4*E4
To find the Current Value of the stock you have to subtract the Current Price Per Share by the Initial Price per share
H4=G4-E4
To find the Gain/Loss of the stock you take the Current Value and subtract the Initial Cost.
I4=H4-F4
To find the percentage of gain/loss you take the gain/loss and subtract the initial cost.
J4=I4-F4