How to Find the Average Price of Common Stock

Determine the purchase prices for the common stock and the quantity of stock purchased at particular prices. For example, assume you purchased 1,000 shares of stock in Company A at $5 per share, 1,500 shares at $4 per share and 2,500 shares at $10 per share.
Multiply the purchase prices by the quantity purchased and add. Continuing the example, (1,000 x $5) + (1,500 x $4) + (2,500 x $10) = $5,000 + $6,000 + $25,000 = $36,000
Add the total number of shares purchased. Continuing the example, 1,000 + 1,500 + 2,500 = 5,000 shares.
Divide the total cost of the shares by the total number of shares: $36,000/5,000 = $7.20. This is the average price of the common stock.