| Capital Home Loans Limited | London | 1987 |
| Capital Homes Limited | London | 2016 |
| Capital Hospitals (Issuer) PLC | Swanley | 2005 |
| Capital I Group Ltd | London | 2025 |
| Capital Indemnity Ltd | London | 2020 |
| Capital Independent Financial Consultants Ltd | Glasgow | 2003 |
| Capital Industree Corporation Ltd | Ruislip, | 2024 |
| Capital Industrial 2 Limited | London | 2020 |
| Capital Industrial 8 Limited | London | 2025 |
| Capital Industrial Holdings 2 Limited | London | 2020 |
| Capital Integrators Ltd | Maidstone | 2023 |
| Capital International Investments Limited | Taunton | 2014 |
| Capital International Limited | London | 1982 |
| Capital Invest Ltd | Romford | 2024 |
| Capital Investements Ltd | Bolton | 2020 |
| Capital Investment Floor Ltd | Pinner | 2026 |
| Capital Investments Holding Ltd | Chelmsford | 2024 |
| Capital Investments Services Limited | Ilford | 2021 |
| Capital Iron Scrap Limited | London | 1996 |
| Capital J Limited | Warrington | 2003 |
| Capital Jones Limited | Manchester | 2026 |
| Capital K and Dash Limited | Alford | 2013 |
| Capital Kinetics Limited | Milton Keynes | 2017 |
| Capital Law Holdings Limited | Cardiff | 2024 |
| Capital Legacy Limited | Anerley | 2013 |
| Capital Lending Limited | Long Eaton | 2021 |
| Capital Lending Solutions Ltd | Letchworth Garden City | 2026 |
| Capital Life Independent Trustee Company Limited | Wilmslow | 2017 |
| Capital Life Investment Co Ltd | London | 2017 |
| Capital Management Systems Ltd | Luton | 2024 |
| Capital Managers Financial Planning Ltd | Glasgow | 2025 |
| Capital Managers Mortgages Limited | Glasgow | 2023 |
| Capital Manor Financial Advisors Limited | Milton Keynes | 2003 |
| Capital Market Communications Limited | London | 2014 |
| Capital Marketing Limited | Liverpool | 2018 |
| Capital Markets Consulting Limited | London | 2023 |
| Capital Markets Strategy Limited | London | 2004 |
| Capital Markets Underwriting Limited | London | 2008 |
| Capital Masterplan Finance Limited | London | 2022 |
| Capital Matters Ltd | London | 2020 |
| Capital Merchant and Investment Group Ltd | Croydon | 2020 |
| Capital Mortgage Protection Ltd | Basingstoke | 2023 |
| Capital Mortgage UK Ltd | Dalkeith | 2014 |
| Capital Motors Global Holdings Limited | Milton Keynes | 2003 |
| Capital NW Ltd | Oldham | 2020 |
| Capital OIL Limited | Walsall | 2005 |
| Capital One (Europe) PLC | Nottingham | 1999 |
| Capital One International Holdings Limited | Nottingham | 2004 |
| Capital One Property Investments Limited | Derby | 2023 |
| Capital Options Limited | Shrewsbury | 2007 |
| Capital Order Limited | Salisbury | 2019 |
| Capital Outsourcing Group (UK) Limited | Birmingham | 2006 |
| Capital Partners Europe Limited | London | 2013 |
| Capital Partners FX Limited | London | 2021 |
| Capital Partners Group Limited | London | 2000 |
| Capital Partners London Limited | Wembley | 1999 |
| Capital Partners Private Equity Ltd | London | 2011 |
| Capital Partners Ventures Ltd | London | 2011 |
| Capital Pensions Management Limited | | 1998 |
| Capital Personal Finance Limited | | 1998 |
| Capital Pest Control Services (Holdings) Limited | Bishops Stortford | 2024 |
| Capital Piccoli London Limited | London | 2021 |
| Capital Place Ltd | London | 2015 |
| Capital Planning Mortgages Limited | Westerham | 2016 |
| Capital Planning Partners (Holdings 2) Ltd | Westerham | 2026 |
| Capital Planning Partners (Holdings) Ltd | Westerham | 2024 |
| Capital Planning Partners Ltd | Westerham | 2023 |
| Capital Plastic Investments Limited | Tunbridge Wells, Kent | 2023 |
| Capital Platform Group Ltd | London | 2019 |
| Capital Plus Partners Limited | London | 1998 |
| Capital Private Finance Limited | Milton Keynes | 2011 |
| Capital Private Office Ltd | London | 2025 |
| Capital Profit Ltd | London | 2025 |
| Capital Properties Group Ltd | Ashton-Under-Lyne | 2026 |
| Capital Property & Finance Ltd. | East Yorkshire | 2002 |
| Capital Property Holdings Ltd | Northampton | 2021 |
| Capital Property Investment (SE) Ltd | Bexley | 2024 |
| Capital Property Maintenance Holdings Limited | Woodford Green | 2021 |
| Capital Protect Limited | Derby | 2004 |
| Capital Pulse Limited | Epping | 2023 |
| Capital Quarters Ltd | London | 2022 |
| Capital Radio Investments Limited | | 1970 |
| Capital Radiosurgery Limited | Harrow | 2022 |
| Capital Raise Solutions Ltd | London | 2025 |
| Capital Raising Group Ltd | London | 2017 |
| Capital Refractories Holdings Limited | Derbyshire | 2025 |
| Capital Remittance Ltd | South Harrow | 2009 |
| Capital Reserve Ltd | London | 2022 |
| Capital Returns Collective Limited | London | 2025 |
| Capital Reward Limited | Huddersfield | 2006 |
| Capital Risk Consultancy Ltd | Tadworth | 2025 |
| Capital Risk Solutions Ltd | London | 2012 |
| Capital Risks MGA Limited | London | 2017 |
| Capital Savings Limited | Warwick | 2021 |
| Capital Seating Holdings Limited | Beaumont Leys | 2022 |
| Capital Services (Holdings) Limited | Kings Langley | 2014 |
| Capital Services (Topco) Limited | Kings Langley | 2020 |
| Capital Services Watford (Holdco) Limited | Watford | 2024 |
| Capital Sky Holdings Limited | Kings Langley | 2022 |
| Capital Solutions (INT.) Ltd | London | 2017 |