Every company quoted on the London Stock Exchange is pigeonholed into one of 45 or so industry sectors. Click here for the categories used by the Financial Times.
Some sectors like Banks are natural groupings of companies in similar industries. Others are artificial groupings of companies that don't easily fit anywhere else - Support Services for instance.
Sector classifications are useful for many reasons:
This last point is important. A key plank of portfolio diversification is to spread your money between at least three different sectors. Ideally they should be sectors with different kinds of characteristics:
A balanced portfolio will spread investments among at least three different sectors and make sure that they are not sectors which all move in the same direction in response to economic forces.
You can get information on sector performance in a variety of ways. Some newspapers, including the Daily Telegraph, print the % movement of each sector in the daily share price listings. The FT on Saturday also summarises sector movements on the week.
For longer term information on sectors, it is best to consult the statistics tables in the back of the weekly and monthly magazines. Investors Chronicle provides tables of the best and worst performing sectors month by month.
Click here for the performance of the healthcare sector over the period of a year and Click here for the performance of the general retailers sector.
Shares magazine has a useful section describing significant developments in each sector during the previous week. Often the developments will relate to a particular company within a sector - but the developments may have an impact on other companies in it.
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