This measures the absolute percentage performance of the share price over the past six months.
It is calculated as (Current Price minus Old Price) divided by Old Price x 100.
Stockopedia explains % Price Chg 6m...
It is to be contrasted with Relative Strength where the percentage change is calculated and compared to the market or some other standard index.
Along with Dividends, the absolute price performance is the other key component to determining Total Shareholder Return.