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