| Chepstow Laser Clinic Limited | Other services | 2011 |
| Cheryl Keatley Productions and Management Limited | Information & communication | 2020 |
| Chippenham Court Residents Company Limited | Hospitality | 1990 |
| Chippenham Court RTM Company Ltd | Households | 2019 |
| Choi Advisory Limited | Professional & scientific | 2016 |
| Chota Quinta Verde Limited | Construction | 2021 |
| CHP Outreach Ltd | Administrative & support | 2025 |
| Chrysalis Direct Limited | Wholesale & retail | 2004 |
| Church Mills Management Company Limited | Households | 2003 |
| Churchill Consultancy Ltd | Administrative & support | 2023 |
| CJM Golf Limited | Arts & recreation | 2011 |
| Ckkr Limited | Professional & scientific | 2016 |
| Clarence Auto Repairs Limited | Wholesale & retail | 2015 |
| Clarkes Butchers Limited | Wholesale & retail | 2007 |
| Clearly Presented Limited | Information & communication | 2002 |
| Cloverhill Equine Physiotherapy Ltd | Professional & scientific | 2024 |
| CMC Construction & Groundworks Ltd | Construction | 2025 |
| CMC Smallholdings Ltd | Real estate | 2023 |
| Cmrs Care Ltd | Health & social care | 2023 |
| CMW Electrical Energy Ltd | Construction | 2021 |
| CNC International Services Ltd | Wholesale & retail | 2020 |
| Cobs and Coloureds Limited | Wholesale & retail | 2019 |
| Codel Limited | Information & communication | 2000 |
| Coetco Ltd | Administrative & support | 2011 |
| Colin Yeend Property Developments Limited | Construction | 2013 |
| Compare Business Finance Limited | Professional & scientific | 2024 |
| Compare Recruitment Factoring Limited | Administrative & support | 2019 |
| Complete Builds and Landscaping Limited | Administrative & support | 2024 |
| Complete Carpentry Solutions Limited | Manufacturing | 2019 |
| Compliance Consultancy (Services) Limited | Extraterritorial | 2013 |
| Conjay Holdings Ltd | Wholesale & retail | 2025 |
| Conjay Quantum Scientific Ltd | Wholesale & retail | 2024 |
| Connected Education Services Ltd | Education | 2023 |
| Constant Rentals CL Limited | Hospitality | 2024 |
| Constant Rentals PL Limited | Hospitality | 2024 |
| Contemporary Films Ltd. | Information & communication | 2008 |
| Cool DEW Consulting Limited | Professional & scientific | 2008 |
| Copperband Ltd | Construction | 2019 |
| Copperson Global Ltd | Wholesale & retail | 2016 |
| Core Electrical Southwest Ltd | Energy | 2020 |
| Cosmos Foods Ltd | Professional & scientific | 2012 |
| Cotton Boulevard Limited | Wholesale & retail | 2019 |
| Countryside-Connections Limited | Information & communication | 2019 |
| Countrystore (Whitestone) Limited | Wholesale & retail | 2018 |
| COX (Ross) Limited | Real estate | 1970 |
| CPJ (Silverfox) Ltd | Professional & scientific | 2018 |
| CPJ Watkins Construction Ltd | Construction | 2022 |
| CPT Groundworks & Construction Limited | Construction | 2026 |
| Crane and Lifting Services Ltd | Manufacturing | 2009 |
| Crane Dental Ltd | Health & social care | 2025 |
| Craptical Classics Ltd | Wholesale & retail | 2024 |
| Create Communication Consultancy Ltd | Professional & scientific | 2016 |
| Creates Cafe Ltd | Hospitality | 2017 |
| Creative Response Limited | Professional & scientific | 1997 |
| Creative Spaces Design Ltd | Construction | 2019 |
| Crossdean Energy Limited | Energy | 2013 |
| Crown & Co. Accountants Limited | Professional & scientific | 2004 |
| Crown Hair Replacement Limited | Other services | 2017 |
| Crown Property Company (Bridgnorth) Limited | Real estate | 1955 |
| Croydon & District Motor Club Limited | Arts & recreation | 1973 |
| Current Accountancy Ltd | Professional & scientific | 2020 |
| Current Advisory Ltd | Professional & scientific | 2025 |
| Custom Leisure Limited | Wholesale & retail | 2021 |
| Custom Steel Design Ltd | Professional & scientific | 2018 |
| CWM Equine Services Limited | Other services | 2023 |
| Cwmbran Tile Fixing Limited | Construction | 2017 |
| D & C Groundtec Limited | Construction | 2014 |
| D R Rosser Limited | Wholesale & retail | 2006 |
| D S Music (UK) Limited | Wholesale & retail | 2008 |
| D&C Holdings SW Ltd | Real estate | 2025 |
| DAI SUM Ltd | Professional & scientific | 2017 |
| DAN Morris Photography Ltd | Professional & scientific | 2019 |
| Danforth Build (the Links) Limited | Extraterritorial | 2013 |
| Danick Properties Limited | Real estate | 2021 |
| Darren John Hill Ltd | Extraterritorial | 2025 |
| Data Salad Ltd | Information & communication | 2024 |
| Davik U K Limited | Wholesale & retail | 1999 |
| DB Footcare Ltd | Health & social care | 2022 |
| DE Clere Management Company Limited | Households | 2012 |
| DE Courcey House Commercial Limited | Real estate | 2022 |
| Deal Locators Limited | Wholesale & retail | 2016 |
| Dean Tyler Builders Ltd | Construction | 2023 |
| Deep Blue Engineering Limited | Other services | 2008 |
| Deepholm Financial Services Ltd | Professional & scientific | 2023 |
| Deepholm Fulfilment Limited | Administrative & support | 2023 |
| Dennis Building & Plastering Limited | Construction | 2025 |
| Dentalex Limited | Administrative & support | 2003 |
| Derive Care Ltd | Administrative & support | 2021 |
| Design Activity Holdings Limited | Arts & recreation | 2018 |
| Design Developments (GB) Limited | Construction | 2004 |
| Designconnectionuk Ltd | Professional & scientific | 2019 |
| Development and Technical Solutions Limited | Professional & scientific | 2011 |
| DG Window Services Limited | Manufacturing | 2003 |
| DH1TRADING Ltd | Administrative & support | 2024 |
| Discovery Music and Vision Limited | Wholesale & retail | 2010 |
| Disgwylfa LLP | | 2023 |
| Dixton Meadows Ltd | Hospitality | 2019 |
| DJ Simmons Kitchens & Bathrooms Limited | Construction | 2019 |
| DJP Design Limited | Professional & scientific | 2003 |
| DJR Estimating & Sales Ltd | Professional & scientific | 2025 |