The average trade price of a stock is the average cost of one share over a certain period of time or by a specific investor. As a basic example, if you buy one share of a particular stock for $100 ...

Think of it this way — if you buy 100 shares of stock at £10 and 25 shares at £20, you can’t simply take the average of £10 and £20 and say £15 is your average trade price.