| CR-05-LEY Ltd | Transport & logistics | 2026 |
| Cradley Business Park Limited | Construction | 2025 |
| Cradley Investments Limited | Real estate | 2025 |
| Craft Concepts Limited | Wholesale & retail | 2023 |
| Craft Factory Ltd | Manufacturing | 2016 |
| Craft Kitchen and Bedroom Ltd | Manufacturing | 2025 |
| Craft Wardrobe Ltd | Professional & scientific | 2020 |
| Craftedge 2D Ltd | Construction | 2026 |
| Cranford Property Ltd | Real estate | 2020 |
| Cranford Supermarket Ltd | Wholesale & retail | 2018 |
| Creams Blue Water Foods Ltd | Wholesale & retail | 2018 |
| Creation Shop Limited | Other services | 2020 |
| Creativ Solutions Ltd | Information & communication | 2012 |
| Creative Brickwork London Ltd | Construction | 2025 |
| Creative Design Trade Limited | Wholesale & retail | 2014 |
| Creative Home Construction Ltd | Construction | 2016 |
| Creative Xolutions Ltd | Information & communication | 2025 |
| Creativision Ltd | Professional & scientific | 2022 |
| Cresent Capital Ltd | Hospitality | 2020 |
| Crestlink Engineering Ltd | Professional & scientific | 2023 |
| Crestop Limited | Administrative & support | 2007 |
| Cretepad Limited | Construction | 2025 |
| Critical Care Without Boarders Ltd | Health & social care | 2020 |
| Cromwell Stores (UK) Limited | Wholesale & retail | 2004 |
| Cross Boroughs Lettings Ltd | Real estate | 2022 |
| Cross Lances FLAT7 Limited | Households | 2020 |
| Cross-Eyed Limited | Health & social care | 2020 |
| Crown & Crescent Developments Ltd | Construction | 2025 |
| Crown Cart Brothers & Co Ltd | Wholesale & retail | 2025 |
| Crown Foods (Hayes) Ltd | Wholesale & retail | 2013 |
| Crown Network Limited | Wholesale & retail | 1989 |
| Crown of Arsh Ltd | Administrative & support | 2026 |
| Crown Oriental Foods Limited | Wholesale & retail | 2021 |
| Crown Roofing Ltd | Construction | 2024 |
| Crown Seating Limited | Manufacturing | 2025 |
| Crown Smile Ltd | Wholesale & retail | 2024 |
| Crownland Construction Limited | Construction | 2020 |
| Crownland Homes Holdings Ltd | Households | 2018 |
| Crownland Homes Limited | Real estate | 2017 |
| Crownland Properties Holdings Ltd | Households | 2018 |
| Crownland Properties Limited | Real estate | 2018 |
| Crownridge Trading Ltd | Wholesale & retail | 2026 |
| Croydon Property Ltd | Real estate | 2025 |
| Croydon Realty Limited | Real estate | 2023 |
| CRT Haulage Ltd | Transport & logistics | 2024 |
| Crystal GRP Ltd | Professional & scientific | 2024 |
| Crystal Pro Limited | Professional & scientific | 2024 |
| Crystalinteriors Ltd | Wholesale & retail | 2020 |
| CS Construction Solutions Ltd | Construction | 2025 |
| CS GAS and Electric Ltd | Manufacturing | 2024 |
| CS Transport (UK) Ltd | Transport & logistics | 2012 |
| Csinkocool Limited | Health & social care | 2022 |
| Csjn Nursing Limited | Education | 2020 |
| CSS Protection Ltd | Administrative & support | 2009 |
| CTS Connect Ltd | Transport & logistics | 2018 |
| Cubex LED UK Ltd | Wholesale & retail | 2019 |
| Cubic COM Trading Ltd | Wholesale & retail | 2018 |
| Cubic Kitchen and Bedroom Limited | Manufacturing | 2018 |
| Cubix Contractors Limited | Construction | 2017 |
| Cubix Contractors London Limited | Construction | 2019 |
| Curry Delight Ltd | Hospitality | 2019 |
| Custom Arts Ltd | Information & communication | 2010 |
| Custom Fitted Wardrobes & Kitchens Limited | Manufacturing | 2025 |
| Custom Metal Roofing Limited | Construction | 2020 |
| CUT and Puff Ltd | Other services | 2023 |
| Cutting Edge Finders Ltd | Wholesale & retail | 2024 |
| Cvrm Ltd | Health & social care | 2023 |
| CW13 Limited | Real estate | 2024 |
| CXM Specialist Limited | Construction | 2023 |
| Cybeforge Ltd | Information & communication | 2025 |
| Cybercafe Retail Ltd | Wholesale & retail | 2025 |
| Cybercafe Trading Ltd | Manufacturing | 2016 |
| Cybernestit Ltd | Information & communication | 2026 |
| Cygnet Couriers Ltd | Transport & logistics | 2017 |
| Cypherpay Ltd | Wholesale & retail | 2020 |
| Cyplan Enterprises Limited | Real estate | 2020 |
| Cyplan Limited | Real estate | 2014 |
| Cypress Book Company (U.K.) Limited | Information & communication | 1985 |
| Cypt Ltd | Professional & scientific | 2022 |
| D a T Ltd | Other services | 2022 |
| D a T Propco Limited | Real estate | 2024 |
| D and G Brothers Ltd | Other services | 2022 |
| D Autos Cars & Vans Ltd | Wholesale & retail | 2025 |
| D Juttla Construction Limited | Construction | 2026 |
| D K Builders London Ltd | Construction | 2021 |
| D K Gaba Ltd | Wholesale & retail | 2018 |
| D K Home Improvement Ltd | Wholesale & retail | 2023 |
| D Mangat Construction Ltd | Construction | 2021 |
| D N Retail Consultancy Limited | Administrative & support | 2010 |
| D Pharma Ltd | Wholesale & retail | 2023 |
| D R Davis Fire Solutions Ltd | Public administration | 2020 |
| D Smith Constructions Limited | Construction | 2011 |
| D T Windows Limited | Construction | 2019 |
| D&A Kanda Properties Ltd | Real estate | 2023 |
| D&B Timber Merchants Ltd | Administrative & support | 2019 |
| D&G Scaffolding Ltd | Construction | 2025 |
| D&J Dhatt Constructions Ltd | Construction | 2018 |
| D&L Security Solutions Ltd | Administrative & support | 2025 |
| D&S Construction Services Limited | Construction | 2019 |
| D'Brix Limited | Real estate | 2025 |