| Carbon Digital Limited | Information & communication | 1999 |
| Carbon Market Ltd | Professional & scientific | 2021 |
| Carbon Neutral Design Limited | Professional & scientific | 2025 |
| Carbon XYZ Ltd | Information & communication | 2020 |
| Carbon-Design (UK) Limited | Wholesale & retail | 2003 |
| Carbonshift Ltd | Information & communication | 2022 |
| Cardan Property Ltd | Real estate | 2021 |
| Cardan Residential Lettings Limited | Real estate | 2026 |
| Carder Investment Ltd | Real estate | 2025 |
| Cardit Online Limited | Wholesale & retail | 2025 |
| Cards, Gifts and Stationery Limited | Wholesale & retail | 2016 |
| Cardwells Bolton Ltd | Real estate | 2020 |
| Cardwells Bury Ltd | Real estate | 2020 |
| Cardwells Lettings Ltd | Real estate | 2020 |
| Cardwells Ltd | Real estate | 2020 |
| Care Administration & Management Services Limited | Health & social care | 1990 |
| Care Aware Information and Advice Service Limited | Information & communication | 2018 |
| Care Connect Healthcare Limited | Health & social care | 2014 |
| Care Corner Limited | Wholesale & retail | 2008 |
| Care First Management Services Limited | Education | 1997 |
| Care Pathway Consulting Ltd | Professional & scientific | 2024 |
| Care Skilled Healthcare Limited | Professional & scientific | 2020 |
| Care Skilled Services Ltd | Professional & scientific | 2016 |
| Care Solutions Cheshire West Ltd | Health & social care | 2020 |
| Care Solutions Supported Living Ltd | Health & social care | 2022 |
| Care Umberella Ltd | Health & social care | 2023 |
| Care-Hire Solutions Ltd | Administrative & support | 2019 |
| CARE24 Services Ltd | Administrative & support | 2023 |
| Career Strategy Group Ltd | Administrative & support | 2025 |
| Career Verse Limited | Wholesale & retail | 2025 |
| Careforward Limited | Extraterritorial | 2003 |
| Carefree Respite Limited | Health & social care | 2023 |
| CARELINK360 Ltd | Wholesale & retail | 2025 |
| Carelio Limited | Administrative & support | 2025 |
| Carenza Care Ltd | Health & social care | 2025 |
| Caresolutions International Healthcare Ltd | Public administration | 2025 |
| Carewheel Contracts Limited | | 1988 |
| Carex Cleaning Services Ltd | Administrative & support | 2025 |
| Cargo Cottage Ltd | Wholesale & retail | 2021 |
| CARGO1GO Limited | Transport & logistics | 2018 |
| Cargomate Logistics (UK) Ltd | Transport & logistics | 2025 |
| Carl Evans Consulting Limited | Information & communication | 2023 |
| Carla Grant Family Ltd | Hospitality | 2025 |
| Carle Offshore Services Limited | Administrative & support | 2021 |
| Carley Financial Limited | Financial services | 2016 |
| Carlos Pascual VS Ltd | Professional & scientific | 2023 |
| Carlotts Ltd | Transport & logistics | 2016 |
| Carlton Cleaners (UK) Ltd | Other services | 2014 |
| Carlton Mansions (Whalley Range) RTM Company Limited | Households | 2007 |
| Carlton Mansions 7-18 (Whalley Range) RTM Company Limited | Households | 2009 |
| Carltonamazon Ltd | Transport & logistics | 2025 |
| Carlyecomm Ltd | Wholesale & retail | 2023 |
| Carlyle House LLP | | 2024 |
| Carman (Holdings) Limited | Professional & scientific | 2013 |
| Carman Plastics Limited | Construction | 2019 |
| Carnelian Limited | Wholesale & retail | 2022 |
| Carnell Signature Properties Ltd | Real estate | 2024 |
| Carnicopia Ltd | Wholesale & retail | 2023 |
| Carolean Capital Ltd | Professional & scientific | 2019 |
| Caroman Limited | Construction | 2016 |
| Caroman Plastics Limited | Construction | 2016 |
| Carousel Games Limited | Administrative & support | 2026 |
| Carpenterra Ltd | Manufacturing | 2025 |
| Carpet & Latex Holdings Ltd | Financial services | 2022 |
| Carpet and BED Warehouse Ltd | Wholesale & retail | 2008 |
| Carpet and Latex International Limited | Manufacturing | 1995 |
| Carpet Empire Ltd | Wholesale & retail | 2025 |
| Carpets 2 Go Ltd | Wholesale & retail | 2014 |
| Carpets and Flooring Manchester Ltd | Wholesale & retail | 2023 |
| Carpets by Raymond Limited | Wholesale & retail | 2022 |
| Carpetsforcaravans Limited | Arts & recreation | 2015 |
| Carpoint Motor Company Ltd | Wholesale & retail | 2014 |
| Carr Lane Europe Limited | Professional & scientific | 2005 |
| Carr Lane International Limited | Professional & scientific | 2005 |
| Carr Lane Manufacturing Company Limited | Professional & scientific | 2005 |
| Carr Lane UK Limited | Extraterritorial | 2002 |
| Carr SL Limited | Health & social care | 2025 |
| Carr's Scotch Beef Shop Limited | Wholesale & retail | 2011 |
| Carr's Solicitors Limited | Professional & scientific | 2004 |
| Carraqua Limited | Water & waste | 2025 |
| Carrie Murphy Consultancy Ltd | Other services | 2022 |
| Carriers Catering Company Limited | Hospitality | 2004 |
| Carrington Fleet Holdings Limited | Financial services | 2007 |
| Carrington-Fleet Textiles Limited | Wholesale & retail | 1972 |
| Carringtons Hair Salon Limited | Other services | 2001 |
| Carrolina Properties Ltd | Real estate | 2020 |
| Carrot Face Limited | Information & communication | 2016 |
| Carrs Pasties Holdings Limited | Financial services | 2019 |
| Carry on Coffee Limited | Hospitality | 2021 |
| Carrycall Ltd | Administrative & support | 2018 |
| Cars Exim Limited | Wholesale & retail | 2025 |
| Cars&Vans Solutions Ltd | Wholesale & retail | 2025 |
| Carsmetic Surgery Ltd | Wholesale & retail | 2018 |
| Carson Evans Building Services Ltd | Construction | 2017 |
| Carson Evans Property Group Ltd | Real estate | 2022 |
| Cart UP Ltd | Wholesale & retail | 2025 |
| Carte Bloom Ltd | Hospitality | 2025 |
| Cartel Competitions Ltd | Wholesale & retail | 2025 |
| Cartel Customz Ltd | Wholesale & retail | 2025 |
| Carter Prestige Ltd | Wholesale & retail | 2021 |