| CP Mason Developments Ltd | Construction | 2021 |
| CPC Associates Ltd | Real estate | 2023 |
| CQS Commercial Ltd | Real estate | 2025 |
| CQS Home Ltd | Real estate | 2023 |
| CR13 Services Ltd | Administrative & support | 2024 |
| Cranford Fragrance Ltd | Wholesale & retail | 2025 |
| Crash Courses Ltd | Other services | 2016 |
| Craviing Limited | Wholesale & retail | 2019 |
| Creation Design & Build Ltd | Construction | 2017 |
| Creative and Connected Communities CIC | Health & social care | 2023 |
| Creative Curtains London Ltd | Manufacturing | 2023 |
| Creative Finishes (London) Ltd | Construction | 2020 |
| Creative Ltd | Wholesale & retail | 2020 |
| Creative Online Shopping Ltd | Wholesale & retail | 2023 |
| Creative Plus Ltd | Professional & scientific | 2010 |
| Credible 121 Ltd | Wholesale & retail | 2024 |
| Credible Estimation Ltd | Construction | 2025 |
| Credit Chase Ltd | Professional & scientific | 2021 |
| Crescent Labs Ltd | Wholesale & retail | 2026 |
| Cresgen LLP | | 2026 |
| Cresvale Ltd | Wholesale & retail | 2025 |
| Cribential Limited | Information & communication | 2025 |
| Crosshatch Homes Ltd | Real estate | 2020 |
| Crosslink Investments Ltd | Real estate | 2021 |
| Crosswinds (London) Limited | Wholesale & retail | 2013 |
| Crown - J Constructions Ltd | Construction | 2019 |
| Crown Atelier Ltd | Wholesale & retail | 2021 |
| Crown BMS Ltd | Manufacturing | 2025 |
| Crown City Collectibles Ltd | Wholesale & retail | 2026 |
| Crown Global Investments Ltd | Real estate | 2022 |
| Crown Meat Market Ltd | Wholesale & retail | 2018 |
| Crown UK Motors Ltd | Wholesale & retail | 2026 |
| Crownvend Limited | Real estate | 2000 |
| Crunchy DRY Fruits and Drinks Ltd | Wholesale & retail | 2026 |
| Crystal Analytics Ltd | Information & communication | 2025 |
| Crystal C&C Ltd | Wholesale & retail | 2026 |
| Crystal CUT Limited | Wholesale & retail | 2018 |
| Crystal Glazing Ltd | Construction | 2025 |
| Crystal Ice Limited | Manufacturing | 1999 |
| Crystal Painters Ltd | Construction | 2019 |
| Crystalview Windows Ltd | Construction | 2023 |
| Crystwel Healthcare Professionals Ltd | Health & social care | 2018 |
| CS Foundation | Health & social care | 2021 |
| CSC Strategy Ltd | Professional & scientific | 2024 |
| CSM Finance Services Ltd | Professional & scientific | 2022 |
| CSS Roofer Ltd | Construction | 2026 |
| Culture Records Limited | Wholesale & retail | 2025 |
| Cupcake and Crumble Limited | Hospitality | 2018 |
| Cupkates Limited | Manufacturing | 2022 |
| CUR Ltd | Other services | 2024 |
| Curdunempire Ltd | Transport & logistics | 2022 |
| CUT Price Autocentre Ltd | Wholesale & retail | 2023 |
| Cutting EJ Ltd | Wholesale & retail | 2021 |
| CVS Builders Ltd | Construction | 2026 |
| CXO Bespokes Limited | Professional & scientific | 2022 |
| CY Times Technology Company Limited | Wholesale & retail | 2023 |
| Cyanic Ltd | Real estate | 2017 |
| Cyber Garrison Ltd | Information & communication | 2024 |
| Cyclon Investment Limited | Real estate | 2021 |
| Cyclon Ltd | Wholesale & retail | 2013 |
| Cypro-Veg Limited | Wholesale & retail | 1986 |
| D & H London Ltd | Construction | 2014 |
| D & P Consultants Ltd | Professional & scientific | 2017 |
| D & S Properties INT Ltd | Real estate | 2021 |
| D & V Educators Limited | Education | 2016 |
| D Great Investment Limited | Real estate | 2020 |
| D K Properties London Limited | Real estate | 2017 |
| D K S R Limited | Wholesale & retail | 2006 |
| D R Patel Enterprises Ltd | Wholesale & retail | 2024 |
| D Salhan Limited | Professional & scientific | 2025 |
| D&A Promotions Ltd | Professional & scientific | 2018 |
| D&B London Investment Limited | Real estate | 2023 |
| D&J Sons Ltd | Wholesale & retail | 2019 |
| D&S Leisure Ltd | Hospitality | 2019 |
| D&S Ridehub Ltd | Transport & logistics | 2026 |
| D'Or Pavilion Limited | Hospitality | 2026 |
| D.D.R Accessories Ltd | Wholesale & retail | 2016 |
| D.J. Heer Property Ltd | Construction | 2017 |
| D.M. Mortgages Limited | Financial services | 2019 |
| D.S.K. Courier Limited | Transport & logistics | 2026 |
| D.S.K.Freight Ltd | Transport & logistics | 2025 |
| D2DG Ltd | Wholesale & retail | 2024 |
| D4S Group Limited | Construction | 2026 |
| D5G Ltd | Financial services | 2025 |
| Dabt Limited | Transport & logistics | 2020 |
| DAC Cars & Motorbikes Ltd | Wholesale & retail | 2026 |
| DAC Motors Ltd | Wholesale & retail | 2023 |
| Dada Property Ltd | Real estate | 2024 |
| Dagmar Trading Ltd | Hospitality | 2025 |
| Dahiya Builders & Decorators Limited | Construction | 2023 |
| Daig Ltd | Hospitality | 2019 |
| Daily Downtime Limited | Information & communication | 2024 |
| Dairy Farm Ltd | Wholesale & retail | 2020 |
| DAK Kochi Express Ltd | Hospitality | 2025 |
| Daljit Singh Ltd | Construction | 2020 |
| Dalvir Singh Ltd | Construction | 2025 |
| Damal Cargo Ltd | Transport & logistics | 2018 |
| DAN Liddiard TV & Film Accounting Ltd | Information & communication | 2016 |
| DAN Redesign Ltd | Construction | 2026 |
| DAN South Bucks Ltd | Construction | 2022 |