| Car Training Ltd | Wholesale & retail | 2024 |
| Car Wash Bay Limited | Other services | 2016 |
| Car-Pod Limited | Wholesale & retail | 2014 |
| Cara Food Limited | Hospitality | 2023 |
| Cara's Nail Creations Ltd | Other services | 2019 |
| Carada Ventures Ltd | Health & social care | 2009 |
| Carat Associates Limited | Real estate | 2006 |
| Caratrans Limited | Transport & logistics | 2016 |
| Carberry Ltd | Real estate | 2021 |
| Carbino Technology Limited | Administrative & support | 2014 |
| Carbon Accountants Limited | Professional & scientific | 2004 |
| Carbon and Cost Consultancy Limited | Professional & scientific | 2023 |
| Carbon and Cost Solutions Limited | Professional & scientific | 2024 |
| Carbon Clearing LLP | | 2025 |
| Carbon Consulting Ltd | Professional & scientific | 2023 |
| Carbon Estates Limited | Real estate | 2003 |
| Carbon Kapture (Mulroy Bay) Ltd | Professional & scientific | 2023 |
| Carbon Kapture Ltd | Other services | 2020 |
| Carbon Management Resources Ltd | Professional & scientific | 2014 |
| Carbon Reduction Analysts Limited | Professional & scientific | 2023 |
| Carbon SIX Digital Limited | Information & communication | 2005 |
| Carborne Capital Limited | Professional & scientific | 2026 |
| Carcare Direct Limited | Wholesale & retail | 2007 |
| Carden Consulting Ltd | Professional & scientific | 2008 |
| Cardev Construction Limited | Construction | 2009 |
| Cardian Group Ltd | Administrative & support | 2023 |
| Cardwell & Simons Limited | Real estate | 2004 |
| Care 2000 Limited | Health & social care | 2015 |
| Care and Relief for the Young | Health & social care | 1992 |
| Care Heroes Limited | Health & social care | 2013 |
| Care Path Solutions Ltd | Information & communication | 2024 |
| Care Recruitment Matters Ltd | Administrative & support | 2018 |
| Care Rescue UK Ltd | Health & social care | 2025 |
| Care Solutions Direct Limited | Administrative & support | 2016 |
| Care Training Solutions Ltd | Health & social care | 2020 |
| Care, Companies Limited | Health & social care | 2014 |
| CARE24 Recruitment Ltd | Health & social care | 2021 |
| Career NET Private Limited | Wholesale & retail | 2025 |
| Careers Support for DA Survivors Ltd | Health & social care | 2024 |
| Carefullyrecruitmentservices Ltd | Health & social care | 2020 |
| Carelaw Ltd | Administrative & support | 2025 |
| Careli Limited | Information & communication | 2026 |
| Carelife Ltd | Health & social care | 2018 |
| Carelux Healthcare Ltd | Health & social care | 2022 |
| Caremr Spraying Ltd | Professional & scientific | 2020 |
| Carers' Hands H C a Ltd | Health & social care | 2020 |
| Careship Ltd | Extraterritorial | 2023 |
| Cargo E Transport Limited | Transport & logistics | 2025 |
| Cargo Today Ltd | Transport & logistics | 2015 |
| Cargo Trans FB Ltd | Transport & logistics | 2026 |
| Carib Electrical Ltd | Construction | 2025 |
| Caribbean Spice & Jerk Ltd | Hospitality | 2023 |
| Caribbean Travel Guides Limited | Information & communication | 2015 |
| Caribic Tanker Limited | Transport & logistics | 2022 |
| Carinadrive Ltd | Transport & logistics | 2020 |
| Caring Hands Domiciliary Services Limited | Health & social care | 2003 |
| Caring Kitchen C.I.C. | Hospitality | 2025 |
| Carlin Ltd | Professional & scientific | 2020 |
| Carlinden Events Ltd | Administrative & support | 2006 |
| Carlogy Ltd | Professional & scientific | 2025 |
| Carlom Limited | Professional & scientific | 2024 |
| Carlos the Cleaner Ltd | Administrative & support | 2022 |
| Carlton Court Freehold (Southampton) Limited | Households | 2006 |
| Carlton Design Planning Ltd | Professional & scientific | 2014 |
| Carltons Property Limited | Real estate | 2021 |
| Carmato Ltd | Transport & logistics | 2025 |
| Carnicero Ltd | Hospitality | 2003 |
| Carnicero Steakhouse Limited | Hospitality | 2022 |
| Carnival Port Holdings Limited | Professional & scientific | 2018 |
| Carnival Technical Services (UK) Limited | Transport & logistics | 2017 |
| Carnival UK Ltd. | Transport & logistics | 2000 |
| Caro Percy Ltd | Manufacturing | 2019 |
| Carols Canine Caring Limited | Agriculture & fishing | 2016 |
| Carote International Limited | Administrative & support | 1996 |
| Carpatic Plus Ltd | Wholesale & retail | 2025 |
| Carpet Cleaning Solutions Made Simple Ltd | Administrative & support | 2022 |
| Carpet Fresh South Ltd | Administrative & support | 2022 |
| Carpet Heroes Limited | Administrative & support | 2025 |
| Carpet News Holdings Limited | Financial services | 2025 |
| Carpet News Limited | Wholesale & retail | 2002 |
| Carpet News Southern Limited | Wholesale & retail | 2025 |
| Carpets 4 Less Southern Limited | Construction | 2009 |
| Carpetzone Limited | Wholesale & retail | 2001 |
| Carr (WP) Property Holdings Limited | Professional & scientific | 2017 |
| Carrick Resources Limited | Mining & quarrying | 2016 |
| Carrington Boats Limited | Manufacturing | 2017 |
| Carrington House Management Company Limited | Households | 1989 |
| Carrington Yachts Limited | Manufacturing | 2006 |
| Carroll Close Management Company Limited | Households | 2020 |
| Cars 4 Trade Ltd | Wholesale & retail | 2025 |
| Cars by Apex Ltd | Wholesale & retail | 2026 |
| Carswell Gould Marcom Limited | Professional & scientific | 2016 |
| Cartek Automotive Electronics Limited | Manufacturing | 2003 |
| Carter & Lambrou Property Ltd | Hospitality | 2025 |
| Carter Haulage Services Ltd | Transport & logistics | 2017 |
| Carter House Freehold Limited | Households | 2020 |
| Carter Property Solutions Limited | Real estate | 2014 |
| Carter Travel Co Ltd | Transport & logistics | 2023 |
| Carter's (Swanwick) Limited | Wholesale & retail | 1944 |
| CARTER1982LTD Limited | Administrative & support | 2026 |