Below is a list of the top insurance companies in the United Kingdom in terms of total assets. Prudential plc is the largest insurance company in the UK with total assets of £470.5 billion ($580 billion) and assets under management (AUM) of £600 billion. Legal & General is Britain's second largest insurance company by assets. It is also the UK’s largest life insurer with £1.2 billion in gross written premiums and more than 5 million customers.
| Rank | Insurance company | Total Assets (GBP, b) | Balance sheet |
| 1 | Prudential plc | 470.498 | 31.12.2016 |
| 2 | Legal & General | 467.854 | 31.12.2016 |
| 3 | Aviva plc | 440.419 | 31.12.2016 |
| 4 | Standard Life | 190.495 | 31.12.2016 |
| 5 | Old Mutual | 171.568 | 31.12.2016 |
| 6 | Phoenix Group Holdings | 85.999 | 31.12.2016 |
| 7 | AEGON UK | 81.747 | 31.12.2016 |
| 8 | RSA Insurance Group | 21.139 | 31.12.2016 |
| 9 | Liverpool Victoria ( LV=) | 16.870 | 31.12.2016 |
| 10 | AIG Europe Limited | 13.093 | 31.12.2015 |
| 11 | Abbey Life Assurance Company * | 10.200 | 31.12.2015 |
| 12 | Direct Line Insurance Group | 10.122 | 31.12.2016 |
| 13 | Amlin plc ** | 7.008 | 31.12.2015 |
| 14 | NFU Mutual | 4.368 | 31.12.2015 |
* Abbey Life was acquired by the Phoenix Group in December 2016.
** Amlin was acquired by Mitsui Sumitomo Insurance Co., Ltd in February 2016.
Top UK Insurers by Market Capitalization
| Rank | Insurance company | Market cap, £b (April 2017) |
| 1 | Prudential plc | 53.54B |
| 2 | Aviva plc | 26.47B |
| 3 | Legal & General | 19.01B |
| 4 | Old Mutual | 11.93B |
| 5 | Standard Life | 9.24B |
| 6 | RSA Insurance Group | 7.58B |
| 7 | Direct Line Insurance Group | 5.92B |
| 8 | Phoenix Group Holdings | 3.68B |