Admiral Group plc is a British financial services company headquartered in Cardiff, Wales. Listed on the London Stock Exchange, it is a constituent of the FTSE 100 Index, and markets the Admiral, Bell, Elephant, Diamond and Veygo vehicle insurance brands, as well as launching the price comparison services Confused.com and Compare.com. The group employs more than 10,000 people across its brands.

Allied Dunbar was a large British life assurance group. In its early years it was known as Hambro Life Assurance and was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index. However it was acquired by BAT Industries, merged with Eagle Star, and sold to Zurich Financial Services in 1998.

Ansvar Insurance is a business division of Ecclesiastical Insurance plc, which is itself wholly owned by Allchurches Trust. It is authorised and regulated by the Prudential Regulation Authority, and is also regulated by the Financial Conduct Authority.

Aon plc is a British multinational professional services firm that sells a range of financial risk-mitigation products, including insurance, pension administration, and health-insurance plans. Aon has approximately 50,000 employees in 120 countries.

Atlas Assurance Company was a British life and fire insurance company established at the beginning of the 19th century in England. Its headquarters were in London, and it had several branches around the world, including Buenos Aires, Manila, Berlin and Washington, D.C..
Benfield Group was a leading independent reinsurance and risk intermediary. Customers included most of the world's major insurance and reinsurance companies as well as government entities and global corporations. A former constituent of the FTSE 250 Index, the company has been a division of Aon Corporation since November 2008.

BP Shipping is the maritime arm of British headquartered global oil company, BP. The unit covers the marine transport, logistics and insurance requirements of all BP's global activities.
Brand Partners, formerly UKI Partnerships, is a partnership company and underwriters owned by the Direct Line Group.

Brit is an international general insurance and reinsurance group specialising in commercial insurance. It was acquired by Fairfax Financial in May 2015.
CGU plc was a large insurance group, created by the merger of Commercial Union and General Accident in 1998. The company was listed on the London Stock Exchange. It merged with Norwich Union in 2000 to form CGNU plc, later renamed Aviva plc.

Co-op Insurance is the trading name of CIS General Insurance, a general insurance company, which is part of the Co-operative Group, based in Manchester, United Kingdom. Co-op Insurance Services, an insurance intermediary incorporated in 2017, is a wholly owned subsidiary of CIS General Insurance.

Combined Insurance is a global provider of supplemental insurance, including accident insurance, life insurance and critical care coverage. Combined Insurance operates in North America, Latin America, Europe and the Pacific. The company is headquartered in Chicago, Illinois.

Commercial Union plc was a large insurance business based in London. It merged with General Accident in 1998 to form CGU plc.

Devitt Insurance Services Limited is a privately owned insurance broker based in Romford, England and have been arranging insurance in the UK since 1936.

Direct Line Insurance Group plc is a British insurance company based in the United Kingdom, formed in 2012 by the divestment of The Royal Bank of Scotland Group's (RBS) insurance division, through an initial public offering. The company owns a number of insurance subsidiaries, providing various insurance products, including Direct Line and Churchill, Darwin as well as the roadside assistance and vehicle recovery provider Green Flag.

The Eagle Star Insurance Company plc was a leading British insurance business. It underwrote the full range of risks including liability, fire, accident, marine, motor, life, contingency and Pluvius (weather) insurance. It was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index.

Eldon Insurance Services Limited or simply Eldon Insurance is a British insurance broking and claims management company controlled by Arron Banks. It is based in Bristol but also has offices in Newcastle, Southampton, and South Africa. Founded in 2007 the company is regulated by the Financial Conduct Authority (FCA). It specialises in motor vehicle insurance and currently operates under the trade names GoSkippy, Footprint, Plato Insurance Services, and Vavista. Also previously Solid Insurance (2013), Business Choice Direct (2014–16) and others.

Endsleigh Insurance is a Cheltenham-based UK insurance intermediary specialising in the student, education, graduate and sport markets. It is the preferred insurer for several unions and professional associations.

The International Life Assurance Society was a 19th-century British insurance company. Its operations in the United States, particularly in the state of Massachusetts, caused it to play a major role in the development of insurance regulation in that country.

ERS is a specialist motor insurer. It has been providing insurance products for more than 70 years and now provides cover solely via Lloyd's Syndicate 218. ERS offers a diverse range of products, including private car, classic car, van, motorcycle, taxi, minibus, fleet, haulage, agricultural vehicle and motor breakdown.

Forces Financial was established in 1999 and is based in Suffolk with its company headquarters situated in Ipswich. It has around 180,000 members in the police and military in three UK locations and 16 military branches including Germany and Cyprus. It employs 140 people in three UK locations - Ipswich, Hook in Hampshire and Hessle in Yorkshire

General Accident plc was a large insurance business based in Perth, Scotland. It merged with Commercial Union in 1998 to form CGU plc.

Guardian Royal Exchange Assurance plc was a large British insurance company. It was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index.

The Hand in Hand Fire & Life Insurance Society was one of the oldest British insurance companies.

Hastings Insurance Services Ltd is a UK personal lines insurance broker servicing customers via smartphone mobile app, online, and by phone. The company provides car, bike, van and home insurance, as well as a range of ancillary products and services such as breakdown cover, personal accident, substitute vehicle and key and legal cover. The company also offers unsecured Personal Loans. It is part of the Hastings Group, a business which was listed on the London Stock Exchange until it was acquired by a consortium of the South African business, Rand Merchant International, and the Finnish insurer, Sampo Group, in November 2020.

InsureandGo is a British travel insurance company which is owned by MAPFRE ASISTENCIA.

The International Life Assurance Society was a 19th-century British insurance company. Its operations in the United States, particularly in the state of Massachusetts, caused it to play a major role in the development of insurance regulation in that country.

Legal & General Group plc, commonly known as Legal & General, is a British multinational financial services and asset management company headquartered in London, England. Its products and services include investment management, lifetime mortgages, pensions, annuities, and life assurance. As of January 2020, it no longer provides general insurance following the sale of Legal & General Insurance to Allianz. It has operations in the United Kingdom and United States, with investment management businesses in the Gulf, Europe and Asia.

The Lloyd's Agency Network was established in August 1811 by the then Committee of Lloyd's of London. They resolved that it is highly important to the interests of Underwriters, that a regular and universal system of intelligence and superintendence should be established in all the Principal Ports and Places, both at home and abroad..., and so the first Agents were appointed at Dover, Deal, Margate, Charleston, Antigua and Madeira.

Lycetts, headquartered in Newcastle upon Tyne, England, is an insurance broker and financial services company which specialises in farming, rural estate and equine insurance, as well as bespoke financial services, household, commercial and bloodstock insurance and risk management advice. Since 2015, Lycetts has been a wholly owned subsidiary of Ecclesiastical Insurance which in turn is owned by Allchurches Trust, and as such all Lycetts’ profits effectively go to charity.

The Motor Insurers' Bureau (MIB) was founded in the UK in 1946 as a private company limited by guarantee and is the mechanism in the UK through which compensation is provided for victims of accidents caused by uninsured and untraced drivers, which is funded by an estimated £30 a year from every insured driver's premiums.

The International Life Assurance Society was a 19th-century British insurance company. Its operations in the United States, particularly in the state of Massachusetts, caused it to play a major role in the development of insurance regulation in that country.

The National Farmers Union Mutual Insurance Society Limited, trading as NFU Mutual, is a UK registered mutual insurance composite. It underwrites more than £1.5 billion (2018) in annual premium in life and general insurance lines for rural communities within the UK. NFU Mutual is based in Stratford-upon-Avon, Warwickshire. NFU Mutual is owned by its policyholders.

Ageas is a Belgian multinational insurance company co-headquartered in Brussels. Ageas is Belgium's largest insurer and operates in 14 countries worldwide. The company was renamed from Fortis Holding in April 2010 and consists of those insurance activities remaining after the breakup and sale of the financial services group Fortis during the financial crisis of 2007-2010.
Norwich Union was the name of insurance company Aviva's British arm before June 2009. It was originally established in 1797. It was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index.

Novae Group plc is an insurance underwriting company headquartered in London. John Hastings-Bass is the company's chairman and Matthew Fosh is the chief executive. The Company was founded in 1986 as SVB Holdings plc and changed its name to Novae Group plc in 2006.

Petplan is a London-based pet insurance company. Pet Plan Limited is a subsidiary of Allianz Insurance plc, part of the Allianz Global Group. Petplan is the largest pet insurance provider in the UK.

Phoenix Assurance or Phoenix Fire Office was a fire insurance company founded in 1680 in England.

Quilter plc, formerly known as Old Mutual Wealth Management Limited, is a British multinational wealth management company formed to take over the UK wealth management business of Old Mutual plc after its separation of business. It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index. The stock has a secondary listing on the Johannesburg Stock Exchange (JSE).

The Refuge Assurance Company Ltd. was a life insurance and pensions company based in England. It was founded by James Proctor and George Robins in Dukinfield, Cheshire in 1858. The company was originally known by the unwieldy name of the Refuge Friend in Deed Life Assurance and Sick Fund Friendly Society.

Resolution plc was a UK insurance company headquartered in the City of London. It was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index but was acquired by the Pearl Group in May 2008.

The Royal Exchange Assurance, founded in 1720, was a British insurance company. It took its name from the location of its offices at the Royal Exchange, London.

Royal Insurance Holdings plc was a large insurance business originating in Liverpool but based in London from the early 20th century. It merged with Sun Alliance in 1996 to form the Royal & Sun Alliance Insurance Group.

RSA Insurance Group Limited is a British multinational general insurance company headquartered in London, England. RSA has major operations in the United Kingdom, Ireland, Scandinavia & Canada. It provides insurance products and services in more than 100 countries through a network of local partners. It has 9 million customers. RSA was formed by the merger of Sun Alliance and Royal Insurance in 1996.

Sedgwick Group plc was a very large British insurance broker. It was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index. However it was acquired by Marsh & McLennan in 1998.

Simply Business - the trading name of Xbridge Ltd - is an online broker of business insurance with over 600,000 customers. The company has been featured in the Sunday Times Tech Track 100 four times and in 2015 and 2016 won The Sunday Times 100 Best Companies to Work For.

Sun Alliance Group plc was a large insurance business based in London. It merged with Royal Insurance in 1996 to form the Royal & Sun Alliance Insurance Group.

Sun Life & Provincial Holdings plc was a large British insurance company. It was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index. It was acquired by French insurance company Axa Group in 1996.

SunLife Ltd is a UK-based financial services company. Founded in 1810, the company is best known for its range of services for people aged 50 and over.

Tokio Marine Kiln is a global specialist insurance company with offices in London, Shanghai, Singapore and Rio de Janeiro. It was formed in 2014 after a merger between R.J Kiln and Tokio Marine Europe.

UIA (Insurance) Limited is a mutual insurance company in the United Kingdom, providing general insurance products to members of the trade union movement and other not-for-profit organisations. It is a member of the Association of British Insurers and is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority. UIA Limited is a wholly owned subsidiary.

Discovery Limited is a South Africa-based financial services group that is listed on the Johannesburg Stock Exchange (JSE) with its headquarters in Sandton.

Willis Group Holdings plc was a multinational risk advisor, insurance brokerage and reinsurance brokerage company with its headquarters in the Willis Building in London until its merger of equals with financial services company Towers Watson in 2016. It was the world's third-largest insurance broker when measured by revenues. Willis has around 400 offices in 120 countries and approximately 18,000 employees.

Marmalade is a UK-based insurance company whose main business is car insurance for young people. The company uses telematics, a satellite technology that monitors the use of the car the company is insuring. This monitors the way the car is driven, when is driven and sends the information back to Marmalade. This information is used to change the amount Marmalade charges the driver for insurance, if the company identifies a bad driver it will increase their premiums and may cancel their policy. From May to July 2011 this technology allowed the company to cut its insurance premiums by 17 percent at a time when the industry trend was for premiums for young drivers to increase.