| Charles Hoile Ltd | Professional & scientific | 2012 |
| Charles Moore (Farming) Limited | Agriculture & fishing | 1976 |
| Charlesworth EA Limited | Real estate | 2023 |
| Charlesworth RJ Holdings Limited | Financial services | 2021 |
| Charley O'Neill Financial Services Ltd | Financial services | 2023 |
| Charnham Mews (Hungerford) Management Company Limited | Households | 1983 |
| Charter 4 Solutions Limited | Professional & scientific | 2009 |
| Charter Travel (Newbury) Limited | Extraterritorial | 2011 |
| Charter Travel LLP | | 2017 |
| Charterhouse Engineering Limited | Information & communication | 2014 |
| Charterist Developments Limited | Administrative & support | 2001 |
| Charterist Investments Limited | Construction | 1997 |
| Charterist Properties Limited | Construction | 1995 |
| Chartvine Limited | Real estate | 1982 |
| Chatelaine Holdings Limited | Financial services | 2025 |
| Chatelaine Interiors Limited | Manufacturing | 2013 |
| Chatfield Food & Drink Ltd | Hospitality | 2022 |
| Chatha Equipment Limited | Administrative & support | 2025 |
| Checkpoint Systems (UK) Ltd. | Wholesale & retail | 1949 |
| Cheraz and Nour Limited | Hospitality | 2024 |
| Chervona Kalyna Ltd | Other services | 2022 |
| Chester Rose Financial Planning Ltd | Professional & scientific | 2006 |
| Chester Rose Ltd | Financial services | 2020 |
| Chief Fire Consultancy Ltd. | Public administration | 2016 |
| Chief Group Maintenance Limited | Households | 2024 |
| Chieveley Manor Sport Horses Ltd | Agriculture & fishing | 2024 |
| Chillax Desserts Limited | Hospitality | 2024 |
| Chiltern Engineering Services Limited | Other services | 2020 |
| Chinese Time Limited | Education | 2014 |
| Chipchase Investments Ltd | Real estate | 2025 |
| Chipfupa Human Resources Ltd | Administrative & support | 2016 |
| CHM Consulting Limited | Professional & scientific | 2022 |
| Choose Where Ltd. | Administrative & support | 2011 |
| Choosewhere Travel Services Ltd | Administrative & support | 2025 |
| Chris Davies Consulting Limited | Professional & scientific | 2022 |
| Chris Lawrence Landscapes Ltd | Administrative & support | 2015 |
| Chromaguard Ltd | Wholesale & retail | 2025 |
| Chudzik Trans Ltd | Transport & logistics | 2019 |
| CHV KB Ltd | Real estate | 2022 |
| Ciber Research Limited | Professional & scientific | 2011 |
| Cigale Consulting Limited | Professional & scientific | 2017 |
| Cine-Sense Ltd | Professional & scientific | 2015 |
| Cinq Holdings Limited | Financial services | 2020 |
| Cipriano Martinez Ltd | Arts & recreation | 2017 |
| Circles Club Ltd | Information & communication | 2026 |
| Circon Limited | Wholesale & retail | 2004 |
| Cirencester & District Builders Limited | Construction | 2003 |
| Cirrus Logic International Holdings Ltd. | Financial services | 2018 |
| Cirrus Logic UK International Holding Co. Ltd. | Financial services | 2014 |
| Ciso Investments Ltd | Real estate | 2021 |
| Citizen Spritz Limited | Manufacturing | 2021 |
| CJ Morris Services Ltd | Construction | 2026 |
| Cjtopco Ltd | Professional & scientific | 2025 |
| Clamberoak Limited | Households | 1989 |
| Clare Howard Associates Ltd | Professional & scientific | 2014 |
| Clare Kirk Consulting Limited | Administrative & support | 2018 |
| Claremont Lodge Ltd | Households | 2014 |
| Claremont Lodge Management Ltd | Households | 2014 |
| Clarendon Plymouth Limited | Real estate | 2000 |
| Clarendon Tate Limited | Administrative & support | 2002 |
| Clarity Finance Group Ltd | Professional & scientific | 2025 |
| Clarity Works Limited | Professional & scientific | 1989 |
| Classic Car Safe LLP | | 2007 |
| Classic Markings Limited | Administrative & support | 2015 |
| Clay and Co Newbury Ltd | Manufacturing | 2025 |
| Clayhill Flats Limited | Households | 1964 |
| Clayhill Freehold Ltd | Households | 1998 |
| CLD Construction Limited | Construction | 2006 |
| Clean GEN Consulting Limited | Extraterritorial | 2012 |
| Clean Start Solutions Ltd | Administrative & support | 2026 |
| Cleaning Concepts Limited | Administrative & support | 2002 |
| Clear Brew Wiltshire Ltd | Administrative & support | 2026 |
| Clear Connect Limited | Information & communication | 2015 |
| Clear Forecast Limited | Professional & scientific | 2015 |
| Clear Sky Innovations Limited | Administrative & support | 2009 |
| Clearview Homesearch Limited | Real estate | 2002 |
| Clearview Immigration LLP | | 2020 |
| Clearview Relocation Consultancy Ltd | Professional & scientific | 2023 |
| Clearview Relocation Limited | Households | 2000 |
| Clearwise Newbury Limited | Water & waste | 2009 |
| Clearwise Treatment Services Limited | Water & waste | 2025 |
| Clere Connect Ltd | Hospitality | 2026 |
| Clere Distribution Limited | Wholesale & retail | 2019 |
| Clere Group Limited | Manufacturing | 1983 |
| Clere Homes Bishops Green Limited | Construction | 2022 |
| Clere Homes Hungerford Limited | Construction | 2025 |
| Clere Homes Limited | Construction | 2020 |
| Clere Properties Newbury Ltd | Real estate | 2019 |
| Clere Property Management Ltd | Real estate | 2024 |
| Clere Resolution Ltd | Construction | 2025 |
| Cleremeadows Ltd | Real estate | 2024 |
| Clereview Ltd | Administrative & support | 2024 |
| Clever Dent Repair Ltd | Wholesale & retail | 2022 |
| Clique Consulting Ltd | Professional & scientific | 2013 |
| Clive Collett Electrical Limited | Energy | 2002 |
| Clive DE Carle UK Ltd | Health & social care | 2020 |
| Cliveden Bloodstock Limited | Administrative & support | 1970 |
| Cliveden Stud Limited | Agriculture & fishing | 1942 |
| Closa Limited | Wholesale & retail | 1994 |
| Cloud Dialogs Ltd | Information & communication | 2005 |