| Rank | Companies |
| 1 | Bain & Company Inc, United Kingdom |
| 2 | W L Gore & Associates (UK) Limited |
| 3 | British Gas Business |
| 4 | Impact Development Training Group |
| 5 | Microsoft Ltd |
| 6 | Stopgap Limited |
| 7 | Beaverbrooks the Jewellers |
| 8 | Admiral Group plc |
| 9 | Fishburn Hedges |
| 10 | SC Johnson |
| 11 | Happy Ltd |
| 12 | ING Direct UK |
| 13 | Wragge & Co LLP |
| 14 | Abel & Cole |
| 15 | Trident |
| 16 | Data Connection |
| 17 | Lansons Communications |
| 18 | Rackspace Managed Hosting |
| 19 | Asthma UK |
| 20 | KPMG |
| 21 | Huxley Associates Ltd |
| 22 | Virgin Mobile |
| 23 | Goldman Sachs International |
| 24 | Diabetes UK |
| 25 | Progressive |
| 26 | O2 (UK & Airwave) |
| 27 | ThoughtWorks Ltd |
| 28 | London & Quadrant Housing Group |
| 29 | The Mall |
| 30 | St. Luke's Communications |
| 31 | National Council for Voluntary Organisations |
| 32 | Academee |
| 33 | Irwell Valley HA Limited |
| 34 | Starbucks Coffee Company UK Limited |
| 35 | Morgan Hunt |
| 36 | Sapient |
| 37 | Bright Horizons Family Solutions Limited |
| 38 | Mercer Oliver Wyman |
| 39 | Schering-Plough Ltd |
| 40 | National Instruments UK |
| 41 | General Mills UK Ltd |
| 42 | Lehman Brothers |
| 43 | Loans.co.uk |
| 44 | Morgan Stanley |
| 45 | Cambridge Antibody Technology |
| 46 | Maybourne Hotel Group |
| 47 | Marks & Spencer Group Plc |
| 48 | Energy for Sustainable Development Ltd |
| 49 | Black & Decker |
| 50 | Flight Centre UK Ltd |
