A FEW EXPLANATIONS -- NOT RIGOROUS DEFINITIONS AIMThe Alternative Investment Market is the London Stock Exchange’s international market for smaller growing companies. Many early-stage companies join AIM as they seek growth capital.EPICEvery traded share has a unique Exchange Price Input Computer (EPIC) code.FTSE 100 IndexThis index consists of the 100 largest companies by market capitalisation on the London Stock Exchange. They account for just over 80% of the UK market.FTSE 250 IndexThis index consists of the next 250 companies which are below the FTSE 100 in size. They account for around 15% of the UK market.FTSE SmallCap IndexThis consists of companies outside the FTSE 100 & FTSE indices and represents some 2% of the UK market.P/E RATIOPrice/Earnings ratio. Obtained by dividing the share price by the annual earnings of that share. The higher the P/E, the more highly the market rates its prospects.YIELDThe percentage return on an investment based on its annual income and present capital value.