| CP Capital Management Ltd | Professional & scientific | 2015 |
| CPS Contracting Ltd | Construction | 2019 |
| CR Complete Solutions Limited | Professional & scientific | 2009 |
| CR Gorman Ltd | Real estate | 2023 |
| Craig Associates Ltd | Financial services | 2004 |
| Crana Rail Limited | Transport & logistics | 2016 |
| Cranleigh Garden Centre Ltd | Administrative & support | 2019 |
| Cranleigh Self Store Ltd | Transport & logistics | 2026 |
| Craytonium Ltd | Information & communication | 2015 |
| CRC Motors Repairs Ltd | Transport & logistics | 2019 |
| Crc-Driveway Ltd | Construction | 2021 |
| Createel International Limited | Wholesale & retail | 2023 |
| Createology Limited | Information & communication | 2013 |
| Creatigo Limited | Information & communication | 2022 |
| Creative Academy Ltd | Professional & scientific | 2023 |
| Creative Activity Limited | Administrative & support | 2017 |
| Creative Care Cosmetics Manufacturing Ltd | Manufacturing | 2022 |
| Creative Living (Lofts & Extensions) Limited | Construction | 2023 |
| Creative Living (South East) Ltd | Construction | 2010 |
| Creative Living Lettings Limited | Real estate | 2024 |
| Creative Ortho Co., Ltd | Administrative & support | 2019 |
| Crescent Arch Properties 2 Ltd | Real estate | 2019 |
| Crescent Arch Properties Management Limited | Real estate | 2016 |
| Creteel Ltd | Professional & scientific | 2018 |
| Criminal Law Consultancy Limited | Professional & scientific | 2009 |
| Crimson Ventures Ltd | Real estate | 2019 |
| CRM Commercials Limited | Other services | 2022 |
| Croftshire Enterprises Ltd | Wholesale & retail | 2024 |
| Crossfit Ickenham Limited | Arts & recreation | 2013 |
| Crow International Limited | Manufacturing | 2018 |
| Crown Accounting & Advisory Ltd | Professional & scientific | 2025 |
| Crown Appeals Limited | Professional & scientific | 2015 |
| Crown Bookkeeping Services Limited | Professional & scientific | 2002 |
| Crown Construction Recruitment Ltd | Other services | 2019 |
| Crown Refurbishments Group Ltd | Construction | 2021 |
| Crown Vorfi Limited | Hospitality | 2024 |
| Crownlodge Developments Lettings Ltd | Real estate | 2020 |
| Crua Construction Limited | Other services | 2013 |
| CRUISE2 Ltd | Administrative & support | 2014 |
| Cruz Consultancy Ltd | Professional & scientific | 2011 |
| Cryptonomix Ltd | Professional & scientific | 2021 |
| CSA (Consulting Services and Accounting) Limited | Professional & scientific | 2012 |
| CSC Cleaning Contractors Ltd | Administrative & support | 2019 |
| CSC Group Services Ltd | Administrative & support | 2019 |
| CSG Kensington Ltd | Wholesale & retail | 2025 |
| Csko Limited | Information & communication | 2011 |
| CSP Industries Co., Ltd. | Extraterritorial | 2023 |
| Ctlegal Ltd | Professional & scientific | 2021 |
| CTR Telecom Ltd | Information & communication | 2021 |
| Cube Power Ltd | Construction | 2019 |
| Curo Transport Limited | Transport & logistics | 2023 |
| Currans Civil Engineering Ltd | Construction | 2019 |
| Current Installation & Developments Ltd | Construction | 2017 |
| Cushysky Limited Liability Partnership | | 2018 |
| Custom Holidays Limited | Administrative & support | 2022 |
| Custom House Co. Ltd | Manufacturing | 2025 |
| Customs Associates Limited | Professional & scientific | 2001 |
| CUT1NCE Builders Ltd | Construction | 2021 |
| Cutler Construction Limited | Construction | 2014 |
| CW Film & TV Services Limited | Construction | 2012 |
| CW Healthcare Experts Limited | Professional & scientific | 2019 |
| CW Osteopathy Ltd | Health & social care | 2025 |
| Cyberlytics Ltd | Information & communication | 2025 |
| Cypress House Maintenance Ltd | Construction | 2026 |
| CYU Int'L Co., Limited | Wholesale & retail | 2014 |
| D & E Consultancy Services Limited | Professional & scientific | 2018 |
| D & S UK Properties Limited | Real estate | 2014 |
| D @ Construction Ltd | Construction | 2020 |
| D Allam Fibre Limited | Construction | 2010 |
| D Cuts Limited | Other services | 2024 |
| D Gallagher Electrical Limited | Construction | 2018 |
| D H Mechanical Limited | Construction | 2017 |
| D J CAV Ltd | Administrative & support | 2019 |
| D Link Investments Ltd | Real estate | 2021 |
| D Linq Ltd | Information & communication | 2017 |
| D Payne Scaffolding Limited | Construction | 2020 |
| D&C Recovery Ltd | Other services | 2015 |
| D&R Drain Services Limited | Water & waste | 2015 |
| D&T Trans Ltd | Transport & logistics | 2016 |
| D&V Construction Ltd | Construction | 2018 |
| D.Booth Electrical Ltd | Energy | 2018 |
| D.M. Steelworks Limited | Manufacturing | 2002 |
| D14TC Limited | Information & communication | 2020 |
| DA Ocean Overseas Ltd | Professional & scientific | 2024 |
| DA Residential Ltd | Real estate | 2023 |
| Da-Beat Limited | Arts & recreation | 2008 |
| Dad's Garage by Paulo Ltd | Wholesale & retail | 2022 |
| Dada's Food Limited | Manufacturing | 2021 |
| Dada's Ultimate Kitchen Limited | Manufacturing | 2021 |
| Dadaisa Ltd | Construction | 2015 |
| Dadas Tiffins Ltd | Manufacturing | 2021 |
| Daisy Estates PK Ltd | Real estate | 2026 |
| Dalal & Patel Properties Limited | Real estate | 2022 |
| Dalia Cars Ltd | Wholesale & retail | 2025 |
| Dalian Import Export Group Limited | Manufacturing | 2023 |
| Damian Construction Limited | Construction | 2023 |
| Damp Pro & Co Ltd | Construction | 2021 |
| DAN Richardson Music Ltd | Arts & recreation | 2016 |
| Dancemelody Limited | Wholesale & retail | 1994 |
| Danear Limited | Real estate | 2022 |