What are the top 5 companies in the UK?

Top 5 UK companies by Net Mkt Cap (GBPmillions) are

1. BP £107,147

2. HSBC £104,973

3. Vodafone £84,101

4. GlaxoSmithKline £73,573

5. Royal Dutch Shell A £70,870

As per FTSE100 June 2008.

1.British Petroleum ( B.P )

2. HSBC Holdings

3. Tesco

4. Vodafone Group

5. Barclays

As of July 2012 on CNN Money