| CLC Social Care Solutions Ltd | Administrative & support | 2016 |
| Clcl Properties Limited | Real estate | 2025 |
| Clean & Celebrate Ltd | Administrative & support | 2026 |
| Clean Air Ventures Limited | Financial services | 2019 |
| Clean and Maintain Ltd | Administrative & support | 2019 |
| Clean and Pest Solutions Ltd | Other services | 2018 |
| Clean Call Ltd | Administrative & support | 2026 |
| Clean Canvas Cosmetics Limited | Wholesale & retail | 2025 |
| Clean Centre Limited | Construction | 2019 |
| Clean Days UK Ltd | Administrative & support | 2026 |
| Clean Energy NW Ltd | Construction | 2020 |
| Clean IT Crazy Limited | Administrative & support | 2025 |
| Clean ME Please Limited | Administrative & support | 2025 |
| Clean Ninja Ltd | Administrative & support | 2025 |
| Clean Start Services UK Ltd | Administrative & support | 2026 |
| Clean to Zenith Ltd | Health & social care | 2025 |
| Cleandove Consultant Ltd | Administrative & support | 2024 |
| Cleaner and Dryer Wellness Groups CIC | Health & social care | 2025 |
| Cleaners North West Limited | Administrative & support | 2022 |
| Cleanforce Pro Ltd | Administrative & support | 2026 |
| Cleanguard Services Ltd | Administrative & support | 2025 |
| Cleaning and Gleaming (Commercial) Limited | Administrative & support | 2026 |
| Cleaning and Gleaming (Domestic) Limited | Administrative & support | 2026 |
| Cleaning NW Limited | Administrative & support | 2020 |
| Cleaning Resources Ltd | Administrative & support | 2026 |
| Cleaning Services 4 U Ltd | Administrative & support | 2019 |
| Cleaningmaster Domestic Nationwide Ltd | Administrative & support | 2021 |
| Cleanr-Uk Limited | Administrative & support | 2019 |
| Cleanroom Compliance Ltd | Administrative & support | 2024 |
| Cleanse and Restore Retreats Limited | Health & social care | 2023 |
| Cleansparkle Group Ltd | Administrative & support | 2026 |
| Cleansubsea UK Limited | Manufacturing | 2025 |
| Cleanvent Ltd | Administrative & support | 2018 |
| Clear Bright Futures Ltd | Administrative & support | 2025 |
| Clear Choice Communications Ltd | Information & communication | 2023 |
| Clear Clean Window Cleaning Services Ltd | Administrative & support | 2012 |
| Clear Core Fibre Ltd | Information & communication | 2023 |
| Clear Cosmetics International Ltd | Other services | 2024 |
| Clear Crystal Services Ltd | Administrative & support | 2009 |
| Clear Developments Ltd | Construction | 2023 |
| Clear Horizons Menopause Limited | Health & social care | 2024 |
| Clear IT Solutions (NW) Ltd | Information & communication | 2013 |
| Clear Path Homes Limited | Households | 2025 |
| Clear Ring Ltd | Information & communication | 2020 |
| Clear Sky Estates Limited | Real estate | 2013 |
| Clear Track Bookkeeping Ltd | Professional & scientific | 2024 |
| Clear Water GAS & Heating Ltd | Professional & scientific | 2008 |
| Clear Water North West Ltd | Manufacturing | 2025 |
| Clear Wave Audio Services Ltd | Information & communication | 2026 |
| Clear-Pulse Limited | Wholesale & retail | 2024 |
| Clearaestheticclinics Ltd | Administrative & support | 2018 |
| Clearance Market UK Limited | Wholesale & retail | 2025 |
| Clearbearing Advisory Ltd | Professional & scientific | 2025 |
| Clearchem Limited | Wholesale & retail | 2021 |
| Clearcommsgroup Limited | Information & communication | 2024 |
| Clearcreator Ltd | Information & communication | 2026 |
| Cleardawn Limited | Real estate | 2003 |
| Clearer Thoughts Limited | Information & communication | 2000 |
| Clearlee Counselling Ltd | Health & social care | 2013 |
| Clearlight Electrical Company Limited | Professional & scientific | 1974 |
| Clearly Better Property Group Limited | Real estate | 2020 |
| Clearmark Tutoring Ltd | Education | 2026 |
| Clearpath Projects Ltd | Construction | 2026 |
| Clearpay (Europe) Limited | Financial services | 2020 |
| Clearpay (International) Limited | Financial services | 2020 |
| Clearscope Delivery Ltd | Information & communication | 2025 |
| Clearview Construction Limited | Construction | 2012 |
| Clearwater Plumbing and GAS Ltd | Construction | 2020 |
| Clearwater Projects NW Ltd | Administrative & support | 2025 |
| Clearway Collectables Ltd | Wholesale & retail | 2024 |
| Clearwork ERP Ltd | Information & communication | 2023 |
| Cleary & Co Solicitors Limited | Professional & scientific | 2019 |
| Clee Field View Development Limited | Real estate | 2015 |
| Clegg and Sons Ltd | Construction | 2025 |
| Clement Evans Properties Limited | Extraterritorial | 1964 |
| Clements & Co Mortgage & Insurance Advisers Ltd | Financial services | 2014 |
| Clements & Dunn Consulting Ltd | Professional & scientific | 2026 |
| CLENSY365 Ltd | Information & communication | 2020 |
| Cleveland Gardens Investment Limited | Real estate | 2014 |
| Cleveland Kitchens (NW) Limited | Manufacturing | 2022 |
| Cleveland Street Metals Ltd | Wholesale & retail | 2026 |
| Clever Chameleon Ltd | Administrative & support | 2019 |
| Clever Hands Creative Limited | Wholesale & retail | 2024 |
| Cleverops Ltd | Information & communication | 2026 |
| Cleversteam Limited | Information & communication | 2010 |
| Cleworth Court Management Company Limited | Households | 2006 |
| Clic QA Solutions Ltd | Information & communication | 2025 |
| Click and Like Ltd | Wholesale & retail | 2024 |
| Click Carmats Group Ltd | Wholesale & retail | 2026 |
| Click Glass Ltd | Manufacturing | 2023 |
| Click N Supply Limited | Wholesale & retail | 2026 |
| Click Optimizer Ltd | Information & communication | 2025 |
| Click Shark Ltd | Information & communication | 2024 |
| Click Valves Limited | Wholesale & retail | 2014 |
| Clickabrickz Ltd | Wholesale & retail | 2026 |
| Clickboost Influence Limited | Professional & scientific | 2025 |
| Clickcraze Ltd | Wholesale & retail | 2025 |
| Clickpick Ltd | Wholesale & retail | 2024 |
| Clickselfie Ltd | Wholesale & retail | 2020 |
| Clickstream Hub Ltd | Professional & scientific | 2026 |