
3i Group plc is a British multinational private equity and venture capital company based in London, United Kingdom. 3i is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index.

Actis is a global emerging markets investment firm focused on the private equity, energy, infrastructure, and real estate asset classes. It has a growing portfolio of investments across Asia, Africa, and Latin America and US$12 billion in assets under management. Since its inception in 2004, the firm has raised US$19 billion in capital, executing over 200 transactions in 40+ countries across all four asset classes.

Apax Partners LLP is a British private equity firm, headquartered in London, England. The company also operates out of six other offices in New York, Hong Kong, Mumbai, Tel Aviv, Munich and Shanghai. As of December 2017, the firm, including its various predecessors, have raised approximately $51 billion (USD) since 1981. Apax Partners is one of the oldest and largest private equity firms operating on an international basis, ranked the fourteenth largest private equity firm globally.

Balderton Capital is a venture capital firm based in London, UK, that invests in early-stage, technology and internet startup companies in Europe. It is considered to be among the four-biggest venture capital firms in the English capital.

Barclays plc is a British multinational universal bank, headquartered in London, England. Barclays operates as two divisions, Barclays UK and Barclays International, supported by a service company, Barclays Execution Services.
Bridgepoint Group plc is a British private investment company listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.

Capital Index is an international financial brokerage service offering online trading in contracts for difference (CFDs) and spread betting. Based in the UK and with an entity in Cyprus, the company offers clients access to a broad range of financial markets including foreign exchange, commodities, stock indices, bonds and metals. Capital Index (UK) Ltd is headquartered in London, United Kingdom and is regulated by the Financial Conduct Authority (FCA).

CMC Markets is a UK-based financial services company that offers online trading in shares, spread betting, contracts for difference (CFDs) and foreign exchange across world markets. CMC is headquartered in London, with hubs in Sydney and Singapore. It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.

The Co-operative Permanent Building Society was a mutual building society, providing mortgages and savings accounts to its members. Its head office was located at New Oxford House in London. In 1970, it was renamed the Nationwide Building Society.

CommuterClub is a UK-based financial services company backed by British tennis player Andy Murray that retails and provides loans for annual season tickets, allowing commuters to pay for them in monthly instalments. CommuterClub was founded in 2013 by Petko Plachkov and Imran Gulamhuseinwala. Imran was honoured for his work in the FinTech industry in January 2017 in the Queen's Honour list with an OBE.

CVC Capital Partners is a British private equity and investment advisory firm with approximately US$111 billion in secured commitments since inception across European and Asian private equity, credit and growth funds. As of 2019, CVC managed US$75 billion of assets, the funds managed or advised by CVC are invested in 73 companies worldwide, employing over 300,000 people in numerous countries. Since 1981, CVC has completed over 500,000 investments across a wide range of industries and countries. CVC was founded in 1981 and today has over 400 employees working across its network of 24 offices throughout Europe, Asia and the Americas.

Duke Street is a private equity firm focused on leveraged buyout and growth capital investments in middle-market companies in Western Europe, particularly the UK and France.

F&C Asset Management Plc was an international asset management company. It was acquired by BMO Global Asset Management in 2014. It's head office was in the City of London in Exchange House, Primrose Street, London.

Fidessa group Holdings Ltd, is a British-headquartered company which provides software and services, such as trading and investment management systems, analytics and market data, to buy side and sell side clients in the financial services sector.

Friends Provident was an organisation offering life insurance based in the London, England. It was founded as a mutual Friendly Society for Quakers, although it was demutualised in 2001 and became a publicly listed company, no longer linked with the Religious Society of Friends. On 29 March 2011 Friends Provident changed its trading name to Friends Life, although its registered name remains as Friends Provident.

FXOpen is a retail and institutional forex broker offering online trading services via MetaTrader 4, MetaTrader 5 and TickTrader trading platforms. It provides access to the electronic communication network (ECN) to execute trades in currency pairs, precious metals, CFDs and cryptocurrency pairs. FXOpen companies operate in Australia, Saint Kitts and Nevis and the United Kingdom and have representatives in a number of other countries.

Gartmore Group Limited was a British-based investment management business. It was listed on the London Stock Exchange.

Greensill Capital was a financial services company based in the United Kingdom and Australia. It focused on the provision of supply chain financing and related services. The company was founded in 2011 by Lex Greensill. It filed for insolvency protection on 8 March 2021.

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.

Hamilton Bradshaw (HB) is a mid-market private equity firm with headquarters in London, England. The company was founded in 2003, by UK serial entrepreneur and former Dragons' Den panelist James Caan. Hamilton Bradshaw's main offices are located in Mayfair, London. Hamilton Bradshaw (HB) can be segmented into private equity, venture capital, recruitment, and real estate.

Hg is a private equity firm targeting technology buyouts primarily in Europe and the US. Hg focuses on investments in technology and services sectors. It invests out of its 8th £2.5 billion core fund and its 2nd £575 million Mercury fund, targeting smaller technology buyouts, both raised in February 2017. Both funds were closed on their hard-caps and were more than 3x oversubscribed versus their targets, receiving strong re-ups from existing investors. The company raised its 1st time £1.5B Saturn large-cap fund in March 2018 and in 2020 raised $11B across three funds, Mercury 3, Genesis 9 and Saturn 2.

Hilco Capital is a British international company that specialises in restructuring and refinancing other companies.

ICE - International Currency Exchange - often known simply as 'ICE' - is a global foreign currency exchange company, based in London. The company went into administration on 5 October 2021.

Kennet Partners is a private equity investment firm that provides growth capital to software, Internet and technology-enabled business services companies in Europe and the US.

Kildare Partners is a London-based private equity fund investing in distressed European real estate assets, founded by the Irish-American billionaire Ellis Short, the Chief Investment Officer.
Lion Capital LLP is a British private equity firm specialising in investments in the consumer sector. Previous and current consumer brands owned by Lion have included Weetabix, Jimmy Choo, Wagamama, Kettle Foods and AllSaints.

London Mutual Credit Union Limited (LMCU) is a not-for-profit member-owned financial co-operative, based in Peckham and operating in the City of Westminster and the London boroughs of Southwark, Lambeth and Camden. The primary lines of business include retail banking, deposit-taking and lending.

London Plus Credit Union Limited is a not-for-profit member-owned financial co-operative, based in Fulham and operating in the City of Westminster and west London boroughs of Hammersmith and Fulham, Kensington and Chelsea, Wandsworth and Hounslow. Wandsworth Plus Credit Union is a trading name of London Plus Credit Union working in partnership with Wandsworth Council in south west London.

MerchantBridge & Co. Ltd. was a London-based boutique private equity firm that specialized in investments in the Middle East and especially Iraq, where it was one of the largest such firms. It was in existence from 2001 to 2018.

NBNK Investments plc was a UK-based financial investment company formed by Lord Levene and a consortium of senior business figures in 2010. The aim of the company was to build a new large UK retail bank primarily through the acquisition of other banks.
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.

PassportCard is part of the Davidshield Group, an international travel insurance and private medical insurance focusing on markets in Germany, Australia and Israel.

Squirrel is a British company that provides an online personal budgeting service. The company claims that it has several thousand users in the United Kingdom. It was described by Liat Clark in Wired magazine as a "total savings, budgeting and bill management tool".

TDR Capital is a British private equity firm headquartered in London, England.

Vitruvian Partners is a European private equity firm focusing on leveraged buyout and growth capital investments in middle-market companies.