| Carpathian Mule Limited | Transport & logistics | 2016 |
| Carpe Diem Accountancy Limited | Professional & scientific | 2016 |
| Carpe Diem Secretaries Limited | Administrative & support | 2016 |
| Carpediem Trading Ltd | Wholesale & retail | 2025 |
| Carpentry Specialists Ltd | Construction | 2025 |
| Carpet Accessory Trims Limited | Manufacturing | 1986 |
| Carpets Leicester Ltd | Professional & scientific | 2013 |
| Carpets of Choice Limited | Construction | 2009 |
| Carradon Group Ltd | Construction | 2025 |
| Carrera Talent Ltd | Professional & scientific | 2026 |
| Carrgo International Ltd | Wholesale & retail | 2026 |
| Carrington Atlantic Enterprises Ltd | Hospitality | 2024 |
| Carrington Atlantic Hospitality Group Ltd | Hospitality | 2026 |
| Carrington Atlantic Investments Ltd | Hospitality | 2024 |
| Carroway Car Group Limited | Wholesale & retail | 2026 |
| Carrville Properties Limited | Real estate | 2025 |
| Carry on Talking Ltd | Wholesale & retail | 2017 |
| Cars & Colours Ltd | Wholesale & retail | 2016 |
| Cars & Vans for Sale Ltd | Wholesale & retail | 2020 |
| Cars Japan Limited | Wholesale & retail | 2022 |
| Cars Timber Frame Erectors Limited | Construction | 2009 |
| Cars to Cars UK Limited | Wholesale & retail | 2023 |
| Carson Logistics Limited | Wholesale & retail | 2024 |
| Carspa Detailing UK Ltd | Administrative & support | 2022 |
| Cartem Limited | Extraterritorial | 2006 |
| Carter & Co Accountants Ltd | Professional & scientific | 2000 |
| Carter Uniform Ltd | Wholesale & retail | 2025 |
| Carters Electrical Limited | Construction | 2014 |
| Carters Family Funeral Services Ltd | Other services | 2026 |
| Cartesian Group Ltd | Extraterritorial | 2026 |
| Cartesian Growth Ltd | Professional & scientific | 2026 |
| Carthage Trading Ltd | Wholesale & retail | 2022 |
| Carthorpe Ltd | Transport & logistics | 2015 |
| Carton Construction Limited | Construction | 2016 |
| Cartovian Ltd | Wholesale & retail | 2026 |
| Cartree Motors Limited | Wholesale & retail | 2018 |
| Cartus Groundworks Ltd | Construction | 2025 |
| Cartwright Carpentry Solutions Limited | Manufacturing | 2014 |
| Cartwright Contracting Services Ltd | Construction | 2025 |
| Caruana-Gysling Limited | Health & social care | 2025 |
| Carvalho Investments Ltd | Financial services | 2016 |
| Carve Design & Marketing Limited | Professional & scientific | 2011 |
| Carvell Construction Services Limited | Construction | 2014 |
| Carver & Rose Ltd | Real estate | 2022 |
| Carvero Limited | Manufacturing | 2006 |
| Carver’S Properties Ltd | Real estate | 2025 |
| Carvin Security Limited | Administrative & support | 2019 |
| Carwala Ltd | Wholesale & retail | 2026 |
| Carworks UK Ltd | Wholesale & retail | 2023 |
| Carworld Group Ltd | Wholesale & retail | 2023 |
| CAS Agencies UK Ltd | Administrative & support | 2006 |
| CAS Complete Auction Services Ltd | Administrative & support | 2026 |
| CAS Healthcare Ltd | Health & social care | 2021 |
| CAS Partnership Limited | Professional & scientific | 2016 |
| Casa 112 Limited | Real estate | 2016 |
| Casa Aquara Ltd | Hospitality | 2025 |
| Casa Bamboo Ltd | Manufacturing | 2023 |
| Casa Buy Ltd | Construction | 2023 |
| Casa Casa SM Ltd | Hospitality | 2024 |
| Casa DE UK Ltd | Hospitality | 2024 |
| Casa Food Leics Ltd | Wholesale & retail | 2025 |
| Casa Imob Group Limited | Real estate | 2025 |
| Casa Leicester Ltd | Real estate | 2016 |
| Casa Williams Ltd | Real estate | 2022 |
| Casa Wise Properties Ltd | Real estate | 2025 |
| Casablanca Café Leicester Ltd | Manufacturing | 2022 |
| Casada Associates Limited | Professional & scientific | 2015 |
| Casaloop Household Ltd | Administrative & support | 2026 |
| Casaveli Ltd | Wholesale & retail | 2024 |
| Casba Cafe Ltd. | Hospitality | 2015 |
| Casba's Pizza & Pasta Ltd | Hospitality | 2025 |
| Casba's Pizza Ltd | Hospitality | 2019 |
| Cascade Aviation & Marine Ltd | Public administration | 2022 |
| Cascade Aviation and Marine Services Limited | Information & communication | 2013 |
| Cascade Commerce Limited | Wholesale & retail | 2023 |
| Cascade Products Limited | Manufacturing | 2009 |
| Cascading Grapes Management Group Limited | Construction | 2018 |
| Cascading Houses Limited | Real estate | 2023 |
| Cascaid Limited | Information & communication | 1995 |
| Case Engineering Limited | Manufacturing | 2004 |
| Caseena Limited | Wholesale & retail | 2012 |
| Casey Interiors Ltd | Real estate | 2020 |
| Cash 2 Switch Limited | Professional & scientific | 2012 |
| Cash N Carry Beds Ltd | Wholesale & retail | 2026 |
| Cash Sale Limited | Professional & scientific | 2015 |
| Cashlines Ltd | Real estate | 2022 |
| Cashmere Hotels Limited | Financial services | 2022 |
| Cashmores Doors & Timber Ltd | Wholesale & retail | 2020 |
| Cashmores DOORS2DOORS Limited | Wholesale & retail | 2022 |
| Cashmores Trade Supplies Limited | Wholesale & retail | 2005 |
| Cashstrapped Events Limited | Information & communication | 2025 |
| Casimir Equestrian Limited | Agriculture & fishing | 2026 |
| Cask 80 Limited | Wholesale & retail | 2025 |
| Cassa-Assura Ltd | Information & communication | 2017 |
| Cassi (U.K) Limited | Professional & scientific | 2002 |
| Cassie Property Investments Ltd | Real estate | 2017 |
| Cassiel CLO Ltd | Wholesale & retail | 2024 |
| Cassius Installations Ltd | Construction | 2026 |
| Castellan (UK) Limited | Professional & scientific | 2008 |
| Casting Services Engineering Ltd | Manufacturing | 2016 |