The Importance of Maintaining Balance!
Shares that make up a market index, such as the leading 100 share index in the UK, don’t all move together in unison on any given day. The headline index simply tells you at the end of the day what the average move of all the stocks were. But look under the hood, there are generally always stocks moving up or down in price.
Companies in an index are also different sizes – some are very large companies and others are small in comparison. However, very large stocks will have a big influence on the direction of an index. For example, according to MSCI, the top ten companies of the leading UK 100 share index account for just over 48%. This is a very high concentration – as the other 90 shares make up the rest. What happens to these ten companies is therefore vital to investors in this market.
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