UK blue chips compose the FTSE 100 Index (Financial Times Stock Exchange Index), which is a share index of the 100 most highly capitalised UK companies, that are listed on the London Stock Exchange.

As in December 2008.
| Rank | Company | Capitalisation (£m) |
|---|---|---|
| 1 | Royal Dutch Shell | 134,376.32 |
| 2 | BP | 116,722.52 |
| 3 | HSBC | 99,573.75 |
| 4 | Vodafone Group | 98,837.71 |
| 5 | GlaxoSmithKline | 71,305.15 |
| 6 | Rio Tinto Group[3] | 53,249.29 |
| 7 | Royal Bank of Scotland Group | 44,741.32 |
| 8 | Anglo American | 40,826.49 |
| 9 | British American Tobacco | 40,264.60 |
| 10 | BG Group | 38,663.88 |