| Building Complete Renovation Ltd | Construction | 2014 |
| Building Renovates Ltd | Construction | 2014 |
| Built With Logic Ltd | Information & communication | 2013 |
| Bullion LLP | | 2005 |
| Burg 'R' DON Limited | Hospitality | 2025 |
| Burge Carterton Limited | Real estate | 2015 |
| Burge Creative Limited | Professional & scientific | 2012 |
| Burgertime Ltd | Hospitality | 2023 |
| Burledge Consulting Ltd | Health & social care | 2025 |
| Burley Park Limited | Agriculture & fishing | 2023 |
| Burrell Innovation Limited | Professional & scientific | 2010 |
| Burrough NO.1 Limited | Other services | 2017 |
| Burrough NO.2 Limited | Other services | 2017 |
| Burtie Learning Ltd | Wholesale & retail | 2018 |
| Burton Technologies Limited | Information & communication | 2022 |
| Bury House Management Limited | Households | 2004 |
| Bury Tyre Centre Limited | Extraterritorial | 2002 |
| Bushcraft UK Wilderness Living Skills Ltd | Administrative & support | 2016 |
| Bushey Down Contracting Limited | Administrative & support | 2007 |
| Business Cobra Limited | Other services | 2021 |
| Business Navigation Services Ltd | Professional & scientific | 2017 |
| Businessfruit Ltd | Information & communication | 2018 |
| Butler Country Estates Limited | Manufacturing | 2013 |
| Butler Ross Limited | Administrative & support | 2009 |
| Butter Bike Co Limited | Manufacturing | 2019 |
| Buy Back Bushfield CIC | Arts & recreation | 2025 |
| Byrne & Byrne Ltd. | Professional & scientific | 2011 |
| Byte Wide Solutions Limited | Information & communication | 2017 |
| C C Mclaughlan Associates Ltd | Professional & scientific | 2013 |
| C H Dixon & Robertson Ltd | Wholesale & retail | 2025 |
| C P Russ Limited | Agriculture & fishing | 2015 |
| C&G Sporting LLP | | 2016 |
| C. Y. Finishes Limited | Manufacturing | 1983 |
| C.Crooks Ltd | Administrative & support | 2020 |
| C.O.P.B. (UK) Ltd. | Real estate | 1994 |
| C2 Renewable Solutions Limited | Professional & scientific | 2017 |
| C3 Design Limited | Professional & scientific | 2003 |
| Cabling People Limited | Administrative & support | 2001 |
| Cabraal Consulting Limited | Professional & scientific | 2020 |
| Cactus Holdings Limited | Real estate | 2022 |
| Cadland Heritage Trustees (a) Limited | Professional & scientific | 2025 |
| Cadland Heritage Trustees (B) Limited | Professional & scientific | 2025 |
| Cadland Trustees Limited | Professional & scientific | 2019 |
| Caerlaverock Estate LLP | | 2017 |
| Cafe Mozzo Limited | Hospitality | 2013 |
| Café Contract Management Ltd | Hospitality | 2024 |
| Caines Brothers Limited | Real estate | 2006 |
| Cairngorm Holiday Home Cleaning Ltd | Administrative & support | 2023 |
| CALAIS7 Ltd | Information & communication | 2015 |
| Cales Consultancy Limited | Professional & scientific | 2015 |
| Calex Properties Ltd | Real estate | 2020 |
| Calibre Innovations Limited | Wholesale & retail | 2014 |
| Caliburn Homes Limited | Real estate | 2016 |
| Calix Consulting Limited | Information & communication | 2012 |
| Callaloo Corner Ltd | Manufacturing | 2022 |
| Callaway Electrical Services Ltd | Construction | 2023 |
| Callian Management Services Limited | Real estate | 2011 |
| Calm Productions (UK) Limited | Information & communication | 2003 |
| Cambridge Building Solutions Ltd | Construction | 2022 |
| Cambridge Business Consulting Ltd | Professional & scientific | 2012 |
| Camden Property Partnership LLP | | 2006 |
| Camden Wells Advisers Ltd | Water & waste | 2021 |
| Camera Exchange (Guildford) Limited | Wholesale & retail | 1957 |
| Camilla Adgar Consultancy Ltd | Professional & scientific | 2025 |
| Campbell & Co (NO 1) Limited | Professional & scientific | 2006 |
| Campbell & Co (NO 2) Limited | Professional & scientific | 2006 |
| Canis Nero Limited | Professional & scientific | 2019 |
| Cannons Heating Services Limited | Construction | 2012 |
| Cansense Group Ltd | Professional & scientific | 2019 |
| Canterbury GP Limited | Financial services | 2023 |
| Capability Capital Limited | Administrative & support | 2022 |
| Capablue Ltd | Information & communication | 2009 |
| Cape Clifton Ltd | Construction | 2021 |
| Capitus Holdings Limited | Professional & scientific | 2017 |
| Capmezz Limited | Professional & scientific | 2019 |
| Capmorg Consultancy Services Limited | Professional & scientific | 2015 |
| Cappa Dustcaps Ltd | Wholesale & retail | 2011 |
| Capstone Property Limited | Construction | 2007 |
| Capsule Collective Ltd | Other services | 2023 |
| Capture 25 Ltd | Professional & scientific | 2019 |
| Caramel Design (UK) Limited | Professional & scientific | 2011 |
| Carbon Trading Investors 1 Ltd | Administrative & support | 2009 |
| Carbon Trading Investors 2 Ltd | Administrative & support | 2009 |
| Carbost Advisors Ltd | Professional & scientific | 2020 |
| Cardinal Park (Southampton) Management Company Limited | Households | 2013 |
| Care Homes Maintenance Limited | Construction | 2004 |
| Carnaby Bond Ltd. | Construction | 2015 |
| Carolyn Hughan Education & Training Limited | Education | 2016 |
| Carp Farm Properties Limited | Real estate | 2011 |
| Carpathian Fields Ltd | Wholesale & retail | 2024 |
| Carrington Law Ltd | Professional & scientific | 2014 |
| Carrington Production Ltd | Manufacturing | 2019 |
| Carsmart South Limited | Wholesale & retail | 2009 |
| Carter London Ltd | Wholesale & retail | 2026 |
| Carter Marsh & Co. Ltd | Wholesale & retail | 2019 |
| Carter Marsh (Holdings) Ltd | Wholesale & retail | 1984 |
| Caselogic Ltd | Information & communication | 2019 |
| Castle Developments Limited | Households | 1987 |
| Castle Fitness Studios Limited | Arts & recreation | 2021 |
| Castle Homes (Southern) Ltd | Construction | 2015 |