| Cleaver Contractors Limited | Construction | 2022 |
| Cleddau Consulting Limited | Information & communication | 2024 |
| Cleervu Property Limited | Real estate | 2020 |
| Cleeve Carpentry and Build Limited | Manufacturing | 2023 |
| Cleeve Court (Cleeve) Management Company Limited | Households | 2018 |
| Cleeve Court Management Company Limited | Households | 1989 |
| Cleeve Financial Planning Limited | Financial services | 2019 |
| Cleeve FP Limited | Professional & scientific | 2024 |
| Cleeve Meadow Management Company Limited | Households | 2021 |
| Cleeve Mews Management Company Limited | Households | 2019 |
| Cleeve Nursery Limited | Wholesale & retail | 2018 |
| Cleevecote Holdings Limited | Real estate | 1966 |
| Cleevewood Account Solutions Limited | Professional & scientific | 2008 |
| Cleevewood Accountancy (Bitton) Limited | Real estate | 2022 |
| Cleevewood Accountancy and Tax Limited | Professional & scientific | 2023 |
| Cleevewood Accountancy Consultancy Limited | Professional & scientific | 2022 |
| Cleevewood Accountancy Limited | Professional & scientific | 2009 |
| Cleevewood Garage (Car Sales) Limited | Wholesale & retail | 2015 |
| Cleevewood Garage (Classics) Limited | Wholesale & retail | 2022 |
| Cleevewood Garage Limited | Professional & scientific | 1957 |
| Cleevewood House Property Management Company Limited | Households | 1986 |
| Clegdale Limited | Other services | 1982 |
| Clekt Group Limited | Information & communication | 2025 |
| Clekt Limited | Information & communication | 2019 |
| Clementine Holdings Ltd | Real estate | 2016 |
| Clementine Ventures Ltd | Information & communication | 2020 |
| Clements Auto Repairs Ltd | Wholesale & retail | 2024 |
| Clements Way Management Company Limited | Extraterritorial | 2021 |
| Clemmings Constructions Ltd | Real estate | 2018 |
| Clent Hills Veterinary Group Limited | Extraterritorial | 2010 |
| Clenze Ltd | Administrative & support | 2025 |
| Cleo's Caring Corner Day Nursery Ltd | Health & social care | 2023 |
| Cleolux Real Estate Ltd | Real estate | 2025 |
| Cleomar Investments Limited | Construction | 1975 |
| Clera Healthcare Ltd | Information & communication | 2023 |
| Clere Bookkeeping Services Limited | Administrative & support | 2010 |
| Clericus & Regina Ltd | Professional & scientific | 2024 |
| Clerra Consulting Ltd | Professional & scientific | 2025 |
| Cleugh Sports Ltd | Education | 2026 |
| Cleve Archers Limited | Arts & recreation | 2015 |
| Cleve Chiropractic Limited | Health & social care | 2003 |
| Cleve House Ltd | Education | 2015 |
| Clevedale Court Limited | Households | 1966 |
| Clevedale Systems Limited | Professional & scientific | 2023 |
| Clevedon Bargain Stores Ltd | Wholesale & retail | 2019 |
| Clevedon Cars and Coffee Monthly Meet CIC | Administrative & support | 2026 |
| Clevedon Fashion Ltd | Wholesale & retail | 2012 |
| Clevedon Funeral Services Limited | Other services | 2000 |
| Clevedon Garages Limited | Wholesale & retail | 1961 |
| Clevedon Scaffolding Limited | Construction | 2022 |
| Clevedon Stone Limited | Real estate | 2018 |
| Cleveland Investments Ltd | Real estate | 2024 |
| Clever Space Construction Limited | Construction | 2022 |
| Cleverley Builders Limited | Construction | 2016 |
| Cleverly and Yeo-Smith Ltd | Financial services | 2023 |
| Cleverspark Ltd | Construction | 2019 |
| Clevett Holdings Limited | Financial services | 2023 |
| Clevva Limited | Wholesale & retail | 2025 |
| Clews Surveys Ltd | Professional & scientific | 2013 |
| Cleyro Limited | Real estate | 2009 |
| Clfassler Ltd | Education | 2018 |
| Clic - Cancer and Leukaemia in Childhood | Health & social care | 1989 |
| Clic Sargent Cancer Care for Children | Professional & scientific | 2004 |
| Clic Sargent Developments Limited | Construction | 2014 |
| Clic Sargent Lottery Limited | Arts & recreation | 2017 |
| Clic Sargent Promotions Limited | Health & social care | 1969 |
| Click 4 Property Solutions Ltd | Real estate | 2017 |
| Click Bristol Ltd | Arts & recreation | 2025 |
| Click Climber Limited | Information & communication | 2011 |
| Click Films Limited | Information & communication | 2010 |
| Click Finco Limited | Professional & scientific | 2023 |
| Click Midco Limited | Professional & scientific | 2023 |
| Click Reps Limited | Professional & scientific | 2022 |
| Click Storm Ltd | Professional & scientific | 2022 |
| Click Therapies Ltd | Health & social care | 2018 |
| Click Topco Limited | Professional & scientific | 2023 |
| Click-Collect Ltd | Wholesale & retail | 2026 |
| Client Funding Accounts Ltd | Hospitality | 2025 |
| Clientcare Specialists Ltd | Administrative & support | 2024 |
| Clients Plus Ltd | Extraterritorial | 2020 |
| Clientseye Limited | Professional & scientific | 2017 |
| Clife Store Ltd | Wholesale & retail | 2025 |
| Cliff Court (Camden) Management Company Limited | Households | 2004 |
| Cliff Park Road (Management) Company Limited | Households | 1973 |
| Cliff Street Consulting Ltd | Information & communication | 2024 |
| Cliffe Collective Ltd | Arts & recreation | 2025 |
| Cliffe Veterinary Group Limited | Extraterritorial | 2020 |
| Clifford Holdings Limited | Extraterritorial | 2025 |
| Clifford House (Management) Limited | Households | 1982 |
| Clifford Property Bristol Ltd | Real estate | 2022 |
| Clifford Talbot Partnership Limited | Professional & scientific | 2010 |
| Clift Guest House Ltd | Hospitality | 2017 |
| Clifton Barbers Ltd | Other services | 2025 |
| Clifton & Cotswold Investments Ltd | Real estate | 2005 |
| Clifton and Chelsea Limited | Professional & scientific | 2012 |
| Clifton and Grosvenor Properties Ltd | Agriculture & fishing | 1995 |
| Clifton Antiquarian Club | Other services | 2006 |
| Clifton Architects Limited | Professional & scientific | 2015 |
| Clifton Assessments & Training Limited | Professional & scientific | 2022 |
| Clifton Asset Management Limited | Information & communication | 2010 |