[Number of shares you own] * GOOGLEFINANCE(“AAPL”,“change”)
So with this, if I own 10 Apple shares and the price is up by $4.25 that day, this formula will return 42.50. That would be my profit for the day on that stock.
Note: if you are using this for UK stocks, remember that prices are in pence, so divide by 100 to get it in pounds.