| CD Welcombe Limited | Financial services | 2021 |
| CD Welcombe Opco Limited | Financial services | 2021 |
| CD Welcombe Propco Limited | Hospitality | 2006 |
| CD Welcombe Topco Limited | Financial services | 2021 |
| CDE Fire Engineering Ltd | Professional & scientific | 2025 |
| CDK Building Services Limited | Construction | 2010 |
| CDM Funeral Carriages Ltd | Other services | 2026 |
| Cecilia Nails Ltd | Other services | 2025 |
| Cedar Hill Solutions Ltd | Professional & scientific | 2023 |
| Cedar Park (Havant) Management Company Limited | Households | 2008 |
| Cedar Ridge Management Company Limited | Households | 2013 |
| Cedarbrook Solutions Ltd | Professional & scientific | 2026 |
| Cedarwood Home Improvements Ltd | Construction | 2023 |
| Cedarwoods Property Group Ltd | Real estate | 2025 |
| Celequin Consulting Ltd | Professional & scientific | 2026 |
| Cellmas Ltd | Extraterritorial | 2018 |
| Celly's Hemel Ltd | Other services | 2026 |
| Celsea Place (Cholsey) Management Company Limited | Households | 2018 |
| Celtic Haven Limited | Hospitality | 1997 |
| Celtic Village (Parklands) Management Co Ltd | Households | 2006 |
| CEM SR Limited | Wholesale & retail | 2016 |
| Cemmaes Court Road Limited | Households | 2016 |
| Cenectus Limited | Professional & scientific | 2023 |
| Central London Property Maintenance Limited | Real estate | 2016 |
| Century Pharmaceutical Limited | Wholesale & retail | 2004 |
| CEO Toolkits Ltd | Professional & scientific | 2016 |
| Cerebrum Software Limited | Information & communication | 2017 |
| Cerise Healthcare Ltd | Administrative & support | 2016 |
| Ceroan Ltd | Construction | 2022 |
| Certa Group Logistics Ltd | Transport & logistics | 2019 |
| Certa Group Ltd | Transport & logistics | 2015 |
| Certa Group Service Ltd | Manufacturing | 2019 |
| Certatech Solutions Ltd | Information & communication | 2015 |
| Certon Limited | Manufacturing | 2017 |
| CESME35 Limited | Hospitality | 2024 |
| Cestria II Quayside Management Company Limited | Households | 2017 |
| Ceteris Paribus Limited | Professional & scientific | 2003 |
| Ceyden Ltd | Hospitality | 2023 |
| Ceylonese Wholesale UK PVT Ltd | Wholesale & retail | 2021 |
| Ceymirion Limited | Information & communication | 2025 |
| CF Designs Limited | Manufacturing | 2016 |
| CGI Monkeys Ltd | Arts & recreation | 2018 |
| CGS Construction and Foundations Ltd | Construction | 2018 |
| CGS Design & Consultancy Limited | Construction | 2022 |
| CH Fisheries Limited | Agriculture & fishing | 2022 |
| Chaceley Grange Management Company Limited | Households | 2005 |
| Chaclorpa Ltd | Health & social care | 2023 |
| Chailey Gardens Management Limited | Households | 2016 |
| Chalkers Rise (Peacehaven) Management Company Limited | Real estate | 2019 |
| Cham Builders Limited | Construction | 2022 |
| Chameleon IT Consultancy Limited | Information & communication | 2005 |
| Chance for Childhood | Health & social care | 1992 |
| Chancerygate (Hemel Hempstead) LLP | | 2005 |
| Chand Homes Limited | Real estate | 2019 |
| Chaneys Limited | Professional & scientific | 2010 |
| Changes Hair Salon (Hemel) Limited | Other services | 2024 |
| Chansecs Limited | Administrative & support | 2006 |
| Chantira Travel Ltd | Administrative & support | 2016 |
| Chantry Place (Great Tattenham) Residents Management Company Limited | Households | 2007 |
| Chapel Kensington Limited | Information & communication | 2007 |
| Chapel West Management Limited | Households | 2002 |
| Chapmanic Laser Supplies Ltd | Professional & scientific | 2025 |
| Chapmanic Limited | Real estate | 1997 |
| Chapter & Compass Ltd | Hospitality | 2025 |
| Chapter 1 Executive Search Limited | Administrative & support | 2002 |
| Chapter One Coffee Ltd | Hospitality | 2018 |
| Char's Cakery Ltd. | Manufacturing | 2013 |
| Character Kingdom Limited | Wholesale & retail | 1995 |
| Character Property Limited | Administrative & support | 2016 |
| Character Wear Limited | Wholesale & retail | 2024 |
| Charfield Gardens Management Company Limited | Households | 2020 |
| Charis Associates & Co Limited | Professional & scientific | 2014 |
| Charles Paul Limited | Hospitality | 2011 |
| Charles Sydney Wines Limited | Wholesale & retail | 2016 |
| Charlie’S Auto Repairs and Sales Limited | Wholesale & retail | 2024 |
| Chartbind Management Limited | Financial services | 2020 |
| Chartbind Operations Limited | Real estate | 2020 |
| Charter Systems Limited | Information & communication | 2007 |
| Charterhouse Muller UK Limited | Information & communication | 2012 |
| Charters Hill Residents Limited | Households | 2016 |
| Chas Cabs Limited | Transport & logistics | 2026 |
| Chase Farm (Gedling) Estate Management Company Limited | Households | 2017 |
| Chaulden Barber Shop Ltd | Other services | 2021 |
| Chaulden Bites Ltd | Hospitality | 2025 |
| Chaulden Developments Ltd | Construction | 2019 |
| Chaulden Properties Ltd | Real estate | 2020 |
| Chay Hedger Limited | Construction | 2003 |
| Chaza Media Limited | Information & communication | 2023 |
| Checkout Solutions Ltd | Information & communication | 2023 |
| Cheeky Cuckoo Ltd | Information & communication | 2023 |
| Cheeky Munkey Limited | Information & communication | 1999 |
| Cheetah Couriers and Logistics Ltd | Transport & logistics | 1981 |
| Cheetah Couriers Limited | Transport & logistics | 2021 |
| Chef JON Watts Ltd. | Hospitality | 2018 |
| Chelsea Direct Limited | Wholesale & retail | 2013 |
| Chelsea House Residential Ltd. | Households | 2011 |
| Chelsea Stores (EBT Trustee) Limited | Professional & scientific | 2003 |
| Chelsea Stores Holdings 2 Limited | Professional & scientific | 2001 |
| Chelsea Stores Holdings Limited | Professional & scientific | 2004 |
| Chemalytix Ltd | Professional & scientific | 2024 |