| Carnett Car Centre Limited | Wholesale & retail | 2014 |
| Carney Capital Ltd | Agriculture & fishing | 2021 |
| Carnival Blaze Ltd | Wholesale & retail | 2025 |
| Carnival Colours Ltd | Wholesale & retail | 2025 |
| Carnot Millett Ltd | Professional & scientific | 2024 |
| Carns Health Care 2 Limited | Public administration | 2025 |
| Caro Agro Foods UK Limited | Wholesale & retail | 2023 |
| Carodan Ltd | Financial services | 2018 |
| Carol Douch Consulting Ltd | Health & social care | 2013 |
| Carol Logistics Ltd | Administrative & support | 2025 |
| Carol Norman Anderson Ltd | Extraterritorial | 2025 |
| Carol Wainwright Limited | Wholesale & retail | 2024 |
| Carole Golden Transport Ltd | Transport & logistics | 2023 |
| Carolina Developments Limited | Administrative & support | 2016 |
| Carolina House CIC | Health & social care | 2023 |
| Caroline Brennan Limited | Information & communication | 2016 |
| Caroline Middleton Assessments Ltd | Public administration | 2022 |
| Caroline Publishing Ltd | Information & communication | 2025 |
| Caroline Street Legal Ltd | Professional & scientific | 2021 |
| Caroline Street Property Management Company Limited | Households | 2006 |
| Caroline Sullivan Limited | Other services | 2015 |
| Carony Limited | Administrative & support | 2025 |
| Carota Capital Invest Ltd | Administrative & support | 2019 |
| Carousel Marketing Limited | Professional & scientific | 1996 |
| Carpe Construction Ltd | Construction | 2025 |
| Carpe Diem Logistics & Transports Ltd | Wholesale & retail | 2020 |
| Carpet Cleaning & Valeting Ltd | Administrative & support | 2026 |
| Carpet Direct Plus Beds Limited | Wholesale & retail | 2013 |
| Carpet Flooring Ltd | Construction | 2025 |
| Carpet IT Ltd | Wholesale & retail | 2017 |
| Carpet Mill Limited | Wholesale & retail | 2023 |
| Carpet Underlays & Accessories Ltd | Wholesale & retail | 2003 |
| Carpet World (Midlands) Ltd | Wholesale & retail | 2007 |
| Carpet World Flooring Ltd | Wholesale & retail | 2013 |
| Carpetluxe and Flooring Ltd | Wholesale & retail | 2023 |
| Carpets Local Ltd | Wholesale & retail | 2024 |
| Carpez Carpet Cleaning Ltd | Administrative & support | 2025 |
| Carphoneholders Ltd | Wholesale & retail | 2022 |
| Carporium Ltd | Wholesale & retail | 2023 |
| Carpro Solutions Ltd | Other services | 2025 |
| Carpuzi Estates Limited | Real estate | 2021 |
| Carreglottery Ltd | Information & communication | 2019 |
| Carrera House Management Company Ltd | Households | 2025 |
| Carrera Services Limited | Professional & scientific | 2015 |
| Carrick Solutions Limited | Information & communication | 2018 |
| Carriglawn Limited | Real estate | 2021 |
| Carrington Binns Limited | Professional & scientific | 1937 |
| Carrington Care Services Ltd | Real estate | 2022 |
| Carrington Enforcement Limited | Administrative & support | 2026 |
| Carrington Rose Psychological Services Limited | Health & social care | 2009 |
| Carrington Shaw Rentals Limited | Other services | 2024 |
| Carrington Thorn Property Management Ltd | Real estate | 2018 |
| Carroll and SON Landscaping Limited | Administrative & support | 2021 |
| Carron DUN Properties Ltd | Real estate | 2025 |
| Carrot Properties Limited | Real estate | 2019 |
| Carrs Lane Counselling Centre Ltd. | Health & social care | 2003 |
| Carrs Lane Ltd | Real estate | 2015 |
| Carrs Paper Limited | Manufacturing | 1953 |
| Carry on Electrical Ltd | Construction | 2023 |
| Carrycatcher Ltd | Wholesale & retail | 2023 |
| Cars & Minivans Logistic Ltd | Transport & logistics | 2021 |
| Cars - SRG Limited | Financial services | 2024 |
| Cars 4RU Limited | Wholesale & retail | 2017 |
| Cars and Vans Sales UK Limited | Wholesale & retail | 2022 |
| Cars by R Limited | Wholesale & retail | 2025 |
| Cars by ZAK Limited | Wholesale & retail | 2025 |
| Cars Hire Ltd | Transport & logistics | 2025 |
| Cars MOT Repairs Ltd | Wholesale & retail | 2017 |
| Cars Services Casablanca Ltd | Wholesale & retail | 2025 |
| Cars-Mania Ltd | Wholesale & retail | 2018 |
| Carsmetics (Birmingham) Ltd | Wholesale & retail | 2023 |
| Carsons Events Ltd | Arts & recreation | 2022 |
| Cart Courier Ltd | Transport & logistics | 2024 |
| Cartech Tyseley Limited | Wholesale & retail | 2025 |
| Cartelligent Limited | Wholesale & retail | 2025 |
| Carter & Longfellow Limited | Other services | 2022 |
| Carter ( Rudibo ) Design Limited | Professional & scientific | 2015 |
| Carter Brown - the Expert Service Limited | Administrative & support | 2002 |
| Carter Building Engineering Services Limited | Extraterritorial | 1959 |
| Carter Cares Ltd | Health & social care | 2018 |
| Carter Consultancy Services Limited | Professional & scientific | 2024 |
| Carter Engineering Building Services Limited | Professional & scientific | 1991 |
| Carter Environmental Engineers Limited | Extraterritorial | 1909 |
| Carter Langfold Limited | Construction | 2024 |
| Carter Mechanical Services Ltd | Construction | 2025 |
| Carter Planned Maintenance Limited | Extraterritorial | 1983 |
| Carter Refrigeration & Retail Services Limited | Extraterritorial | 2003 |
| Carter Retail Equipment Limited | Manufacturing | 1959 |
| Carter Rolan Ltd | Administrative & support | 2024 |
| Carter Stone Construction Limited | Construction | 2019 |
| Carter Synergy Limited | Manufacturing | 1921 |
| Carter TCM Ltd | Health & social care | 2023 |
| Carter Thermal Industries Limited | Professional & scientific | 1945 |
| Carter's Contracts Limited | Construction | 2015 |
| Carters BMC Limited | Real estate | 2023 |
| Carters Cleaners Limited | Administrative & support | 2025 |
| Carters CPM Limited | Real estate | 2014 |
| Carters Logistics Limited | Administrative & support | 2016 |
| Carters Malvern Ltd | Wholesale & retail | 2017 |
| Carters News Ltd | Wholesale & retail | 2024 |