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The SHAREtrack 100 - in association with PricewaterhouseCoopers - is an index of publicly quoted companies which are either headquartered, or have a significant base in Business Weekly's coverage area - the East of England.
The 100 constituents were picked by Business Weekly staff with the aim of providing a barometer for the performance of the region's wider business cluster.
It is by no means a list of the region's biggest companies, nor is it a catalogue of the best or most successful, but a bid to build a quantitative picture of the health - or otherwise - of the most innovative elements of the regional economy. As would be expected of an emerging business centre such as the East of England, the size of the companies tracked by this index varies enormously, from single figure millions to several billions of pounds.
We do not pretend that the approach is truly scientific, but at the same time we believe there is inherent value in tracking the fortunes of a group of companies that have a collective market capitalisation of around £32bn.
Biotechnology and ICT companies are strongly represented in the SHAREtrack 100, a reflection of their position as key drivers of economic growth in the region. Equally, old economy players across a diverse range of sectors stake their own claim for inclusion.
The make-up of the Index is reviewed on a quarterly basis, but substitutions are generally only made in instances when a company moves out of the region, ceases trading or is acquired by a much larger player. In the latter case, a judgement is made on whether the acquired East of England operations can be deemed a significant part of the enlarged organisation.
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