| Cleaning Kings Ltd | Administrative & support | 2025 |
| Cleaning Manchester Ltd. | Other services | 2013 |
| Cleaning Master Manchester Ltd | Administrative & support | 2015 |
| Cleaning Prestine Ltd | Administrative & support | 2025 |
| Cleaning Services Nationwide Limited | Administrative & support | 2022 |
| Cleaning Stppts Services Ltd | Administrative & support | 2020 |
| Cleaning Supplies 2U Ltd | Wholesale & retail | 2023 |
| Cleaning Ventures Limited | Administrative & support | 2012 |
| Cleaningify Limited | Administrative & support | 2025 |
| Cleaniq Services Limited | Administrative & support | 2025 |
| Cleankrate Limited | Administrative & support | 2026 |
| Cleanmatic Ltd | Administrative & support | 2025 |
| Cleanpal Services Ltd | Administrative & support | 2017 |
| Cleanplateplus Ltd | Information & communication | 2026 |
| Cleanrooms Solutions Limited | Manufacturing | 2024 |
| Cleanscene Solutions Ltd | Administrative & support | 2002 |
| Cleanshine Ltd | Administrative & support | 2019 |
| Cleantec Professionals Limited | Construction | 2000 |
| Cleanzia Ltd | Administrative & support | 2025 |
| Cleanzyme Ltd | Administrative & support | 2018 |
| Clear Aesthetic Solutions Ltd | Health & social care | 2018 |
| Clear and Direct Maintenance Ltd | Construction | 2018 |
| Clear Ascent Finance Ltd | Professional & scientific | 2025 |
| Clear Audit Ltd | Professional & scientific | 2026 |
| Clear Bay Clean Ltd | Administrative & support | 2025 |
| Clear Blue Water Limited | Other services | 2013 |
| Clear Built Ltd | Information & communication | 2026 |
| Clear Car Group Ltd | Wholesale & retail | 2019 |
| Clear Car Valeting Ltd | Extraterritorial | 2021 |
| Clear Choice Properties Ltd | Real estate | 2019 |
| Clear Cloud Integration Limited | Information & communication | 2017 |
| Clear Cook UK Ltd | Wholesale & retail | 2024 |
| Clear Costs Limited | Professional & scientific | 2011 |
| Clear Customs Ltd. | Transport & logistics | 2020 |
| Clear Digital Limited | Extraterritorial | 1998 |
| Clear Dynamic Care Ltd | Extraterritorial | 2026 |
| Clear Dynamic Home Services Ltd | Extraterritorial | 2026 |
| Clear Edge Nutrition Limited | Manufacturing | 2023 |
| Clear Elite Limited | Other services | 2024 |
| Clear Elite Network Ltd | Extraterritorial | 2026 |
| Clear Elite Network Pros Ltd | Extraterritorial | 2026 |
| Clear Evidence Solutions Ltd | Manufacturing | 2025 |
| Clear Find Limited | Other services | 2025 |
| Clear Finish Cleaning Solutions Ltd | Administrative & support | 2023 |
| Clear Green Sky Limited | Households | 2023 |
| Clear Groundworks Limited | Construction | 2024 |
| Clear Hub AI Ltd | Administrative & support | 2019 |
| Clear Index Ltd | Extraterritorial | 2022 |
| Clear Law LLP | | 2004 |
| Clear Legal Limited | Professional & scientific | 2006 |
| Clear Legal Marketing Limited | Professional & scientific | 2012 |
| Clear Mango Ltd | Real estate | 2011 |
| Clear Medical Consulting Limited | Health & social care | 2011 |
| Clear Medical Limited | Other services | 2016 |
| Clear Merchant Ltd | Wholesale & retail | 2026 |
| Clear Mind Business Solutions Limited | Information & communication | 2018 |
| Clear Minds Consulting Limited | Health & social care | 2020 |
| Clear Motion Sports Ltd | Arts & recreation | 2024 |
| Clear My Waste Limited | Wholesale & retail | 2022 |
| Clear Nexus Limited | Information & communication | 2024 |
| Clear Path Advisors Ltd | Extraterritorial | 2026 |
| Clear Path Business Advisors Ltd | Extraterritorial | 2026 |
| Clear Path Debt Solutions Limited | Financial services | 2022 |
| Clear Pathway Financial Planning Limited | Financial services | 2025 |
| Clear Payroll Limited | Professional & scientific | 2022 |
| Clear Plus Ltd | Administrative & support | 2025 |
| Clear Probate Limited | Professional & scientific | 2020 |
| Clear Property Consultancy Ltd | Construction | 2015 |
| Clear Scope AI Ltd | Information & communication | 2025 |
| Clear Skies Software Limited | Information & communication | 2000 |
| Clear Start Accountants Limited | Professional & scientific | 2019 |
| Clear Start Direct Ltd | Wholesale & retail | 2020 |
| Clear Steps Plus Education Ltd | Education | 2018 |
| Clear Strategic Solutions Ltd | Professional & scientific | 2014 |
| Clear Stride Clothing Limited | Wholesale & retail | 2024 |
| Clear Swift Service Group Ltd | Extraterritorial | 2026 |
| Clear Tax Global Ltd | Administrative & support | 2023 |
| Clear Tax Group Ltd | Administrative & support | 2023 |
| Clear to Send Limited | Information & communication | 2014 |
| Clear Vision & EYE Care Ltd | Public administration | 2021 |
| Clear Vision Investments Limited | Real estate | 2013 |
| Clear Vision Realty Pros Ltd | Extraterritorial | 2026 |
| Clear Vision Team Ltd | Extraterritorial | 2026 |
| Clear Visual Communications Ltd | Information & communication | 2010 |
| Clear Waste Skip Hire Ltd | Water & waste | 2025 |
| Clear Water Administration Limited | Administrative & support | 2023 |
| Clear Windows Ltd | Construction | 2021 |
| Clearalot Ltd | Water & waste | 2026 |
| Clearance Appliances Ltd | Wholesale & retail | 2025 |
| Clearance Boys Limited | Wholesale & retail | 2026 |
| Clearance Collective Ltd | Information & communication | 2023 |
| Clearance Deals Trading Ltd | Wholesale & retail | 2023 |
| Clearance King Ltd | Wholesale & retail | 2014 |
| Clearance Today Ltd | Wholesale & retail | 2022 |
| Clearbrick Properties Ltd | Real estate | 2025 |
| Clearbridge Trading Ltd | Wholesale & retail | 2026 |
| Clearbrook Property Ltd | Real estate | 2021 |
| Clearchoice Windows (North West) Ltd | Construction | 2024 |
| Clearco Insure Limited | Financial services | 2015 |
| Clearconcept Digital Ltd | Professional & scientific | 2026 |