For example, Google quotes the price of IAG on 31 Jan (before rights issue) as 229p, but Stockopedia shows it to be 337p. Google adjusts pre-rights issue prices by dividing the market cap at that time by the new number of shares outstanding after rights issue. This essentially gives the value of your shares if you do nothing at the rights issue and let it dilute your shares. So on 31 Jan the price of IAG would have been around 572p (the rights issue was 3-for-2). If you purchased shares on 31 Jan and fully exercised your rights to the new shares at 92p per share, then your average cost would have been 284p per share. So I have no idea how the 337p shown in Stockopedia's chart (which in fact matches the data shown on Financial Times' chart) is calculated. 

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