| CLA Group Investments Ltd | Real estate | 2023 |
| Clac Management Services Ltd | Construction | 2025 |
| Clad Build UK Limited | Manufacturing | 2010 |
| Clad Installations Ltd | Construction | 2025 |
| Claim Hero Limited | Administrative & support | 2026 |
| Claim Verification Limited | Administrative & support | 2021 |
| Claimbridge Recovery Partners Ltd | Professional & scientific | 2026 |
| Claimexp. UK Ltd | Professional & scientific | 2024 |
| Claims Northwest Limited | Professional & scientific | 2025 |
| Claims World Intel Ltd | Financial services | 2024 |
| Clair FOX Limited | Wholesale & retail | 2010 |
| Clair Gardens Limited | Professional & scientific | 1998 |
| Claire Briggs Limited | Health & social care | 2016 |
| Claire Cribley Ltd | Administrative & support | 2019 |
| Claire Dora Healthcare Limited | Health & social care | 2026 |
| Claire Farmiloe Financial Services Ltd | Administrative & support | 2015 |
| Claire Thomas Asset Management Limited | Real estate | 2020 |
| Claires Hair (Liverpool) Ltd | Other services | 2023 |
| Clairesnape Ltd | Other services | 2020 |
| Clamanti Salon Supplies Ltd | Wholesale & retail | 2014 |
| Clare Bamber Ltd | Health & social care | 2011 |
| Clare Johannah Designs Ltd | Wholesale & retail | 2020 |
| Clare Leisure Limited | Wholesale & retail | 2011 |
| Clare Roche Legal Ltd | Professional & scientific | 2024 |
| Clare Suzanne Ltd | Administrative & support | 2017 |
| Clare's Property Solutions UK Ltd | Real estate | 2015 |
| Claremont Medical Ltd | Health & social care | 2011 |
| Clarence Communications Limited | Professional & scientific | 2013 |
| Clarence Store Ltd | Wholesale & retail | 2021 |
| Clarence Sweets Ltd | Wholesale & retail | 2025 |
| Claret & Blue Ltd | Information & communication | 2018 |
| Claret Consulting Limited | Professional & scientific | 2014 |
| Clarita Global Matrix Limited | Information & communication | 2025 |
| Claritas JV3 Limited | Professional & scientific | 2015 |
| Claritee Corporate Limited | Administrative & support | 2023 |
| Claritee Limited | Administrative & support | 2023 |
| Clarity Ceramics Limited | Manufacturing | 2025 |
| Clarity Creation Limited | Professional & scientific | 2007 |
| Clarity Property Solutions (North West) Ltd | Construction | 2021 |
| Clarity Skin Studio Ltd | Other services | 2026 |
| Clarity Training and Recruitment Ltd | Education | 2025 |
| Clark & Davidson Ltd | Real estate | 2009 |
| Clark Civils Ltd | Construction | 2018 |
| Clark Investment Management Ltd | Extraterritorial | 2013 |
| Clark Playgrounds Ltd | Administrative & support | 2024 |
| Clarke & Company 2 Limited | Construction | 2019 |
| Clarke and Co Housing Management Ltd | Real estate | 2019 |
| Clarke and Co Property Ltd | Real estate | 2008 |
| Clarke and Company 3 Limited | Real estate | 2020 |
| Clarke Cables (UK) Limited | Construction | 2008 |
| Clarke Chapman Portia Port Services Limited | Transport & logistics | 1996 |
| Clarke Connections UK 24 Ltd | Administrative & support | 2024 |
| Clarke Creates Ltd | Other services | 2021 |
| Clarke Electrical Ltd | Construction | 2020 |
| Clarke Family Butchers Limited | Wholesale & retail | 2019 |
| Clarke Health & Safety Consultancy Limited | Administrative & support | 2005 |
| Clarke Infrastructure Planning Ltd | Professional & scientific | 2019 |
| Clarke Manufacturing Ltd | Manufacturing | 2013 |
| Clarke Property & Management Ltd | Real estate | 2024 |
| Clarke Rental Properties Limited | Real estate | 2021 |
| Clarke Residential Property Limited | Real estate | 2020 |
| Clarke's Barks Ltd | Other services | 2023 |
| Clarkeai Ltd | Wholesale & retail | 2025 |
| Claro Risk Management Limited | Financial services | 2025 |
| Class 507 Preservation Ltd | Manufacturing | 2024 |
| Class Coaching Ltd | Health & social care | 2022 |
| Class Delta Ltd | Manufacturing | 2012 |
| Class Living Property Rent to Rent Ltd | Real estate | 2025 |
| Classhoppa Ltd. | Information & communication | 2021 |
| Classic Cars of Wirral Ltd | Wholesale & retail | 2001 |
| Classic Restaurants Limited | Hospitality | 1986 |
| Classic Vehicle Catering Limited | Hospitality | 2019 |
| Classical Blinds Ltd | Manufacturing | 2016 |
| Classics Gym Ltd | Arts & recreation | 2026 |
| Classictask Limited | Mining & quarrying | 2010 |
| Classnet Limited | Hospitality | 2026 |
| Classy MAN Barber Shop Ltd | Other services | 2025 |
| Claudia Erecords Limited | Arts & recreation | 2016 |
| Claudia Serra Ltd | Professional & scientific | 2022 |
| Clausenvest Limited | Professional & scientific | 2019 |
| Clay Lane Solar Limited | Energy | 2019 |
| Clay Partners Ltd | Health & social care | 2024 |
| Clay Workshop Ltd | Arts & recreation | 2024 |
| Claydon Construction Group Limited | Construction | 2016 |
| Claylands Farm Solar Limited | Energy | 2023 |
| Claypit Coffee Ltd | Hospitality | 2020 |
| Clayson Estates Limited | Construction | 2006 |
| Clayson Estates Liverpool Limited | Construction | 2008 |
| Clayton Clinical Solutions Ltd | Professional & scientific | 2016 |
| Clayton Consultancy Ltd | Professional & scientific | 2008 |
| Clayton Investments (Formby) Limited | Real estate | 2020 |
| Clayton Nails & Spa Ltd | Other services | 2023 |
| Clayton Nails Ltd | Other services | 2025 |
| Clayton Store Ltd | Wholesale & retail | 2023 |
| Claytons Properties Limited | Real estate | 2017 |
| Clayzies Properties Ltd | Administrative & support | 2025 |
| CLB Ventures Ltd | Hospitality | 2017 |
| CLC Children Services Ltd | Health & social care | 2026 |
| CLC Consultancy Group Ltd | Professional & scientific | 2026 |
| CLC Power Solutions Ltd | Construction | 2025 |