| Companies Home Ltd | Administrative & support | 2024 |
| Company TEN Ltd | Professional & scientific | 2020 |
| Compass London Independent Limited | Extraterritorial | 2022 |
| Compassion Acts Limited | Other services | 2016 |
| Compassionate: Coaching & Consulting Ltd | Professional & scientific | 2026 |
| Compkey Healthcare Ltd | Administrative & support | 2014 |
| Complete Beauty Aesthetics Ltd | Other services | 2012 |
| Complete Conservatories & Window Solutions Ltd | Construction | 2024 |
| Compusource Limited | Information & communication | 2021 |
| Comurphy Construction Ltd | Construction | 2025 |
| CON Engineering Limited | Construction | 2015 |
| Concept Food One Limited | Hospitality | 2024 |
| Concierge Claims Management Limited | Administrative & support | 2018 |
| Coniston Court RTM Company Limited | Households | 2013 |
| Conlon Home Care Services Ltd | Health & social care | 2025 |
| Connollys Southport Ltd | Hospitality | 2024 |
| Conrad James Properties Limited | Real estate | 2025 |
| Consently Ltd | Extraterritorial | 2015 |
| Consign Bloodstock Limited | Agriculture & fishing | 2026 |
| Consign Ltd | Agriculture & fishing | 2024 |
| Consolidated Supplies (UK) Ltd | Wholesale & retail | 2017 |
| Container Fort Ltd | Transport & logistics | 2025 |
| Contemporary Glassworks Ltd | Construction | 2015 |
| Continous Improvement Limited | Administrative & support | 2012 |
| Contract Cleaning Services Limited | Administrative & support | 2018 |
| Conversio Digital Marketing Ltd | Professional & scientific | 2020 |
| Cook & Talbot Limited | Professional & scientific | 2017 |
| Cooperheat Equipment Ltd | Manufacturing | 2023 |
| Coopersbarsouthport Ltd | Hospitality | 2019 |
| Coravant Technologies Limited | Information & communication | 2025 |
| Core Carpentry Limited | Construction | 2016 |
| Core Construction Southern Limited | Construction | 2023 |
| Core Electrical Engineering Ltd | Construction | 2023 |
| Cornelius Interiors Ltd | Construction | 2019 |
| Corona Estates Limited | Real estate | 2009 |
| Corrakeel Limited | Information & communication | 2026 |
| Correct Universe Ltd | Information & communication | 2016 |
| Corridoor Limited | Administrative & support | 2000 |
| Corsynx Ltd | Information & communication | 2025 |
| Corus Digital Health Ltd | Information & communication | 2026 |
| COS Finance Ltd | Financial services | 2022 |
| Cost Chambers Legal Cost Consultants Limited | Professional & scientific | 2017 |
| Costel Construct Limited | Construction | 2025 |
| Cosy Homes Properties Limited | Real estate | 2017 |
| Couchquest Ltd | Information & communication | 2024 |
| Cousin Care Ltd | Health & social care | 2021 |
| Coventry Project Management (UK) Limited | Real estate | 2001 |
| Coyote Clip Limited | Manufacturing | 2015 |
| CPL Transactions Ltd | Professional & scientific | 2024 |
| CPT Building Solutions Ltd | Construction | 2016 |
| CPT Electrical Services Ltd | Professional & scientific | 2018 |
| CPW Bars Ltd | Hospitality | 2019 |
| CR Travel Ltd | Administrative & support | 2024 |
| Cradle Consultancy CIC | Health & social care | 2020 |
| Craft & Sons Limited | Real estate | 1997 |
| Craft & Sons Property Management Limited | Real estate | 2023 |
| Craft Heritage Ltd | Construction | 2026 |
| Craft&Sons Construction Limited | Construction | 2019 |
| Craghill Holdings Limited | Real estate | 2024 |
| Craig Prince Brickwork Limited | Construction | 2024 |
| Crashcompare.Com Ltd | Professional & scientific | 2019 |
| Create Dance Limited | Administrative & support | 2026 |
| Creativ Culture Ltd | Manufacturing | 2020 |
| Creative Developers Ltd | Information & communication | 2021 |
| Creative Graft Limited | Real estate | 2023 |
| Creative Lifetime Solutions Ltd | Extraterritorial | 2010 |
| Creative Monkeys Productions Limited | Professional & scientific | 2015 |
| Creative Tribe Ltd | Professional & scientific | 2014 |
| Creative World Kitchens & Bathrooms Ltd | Wholesale & retail | 2021 |
| Creative Z Limited | Arts & recreation | 2016 |
| Crescent Investments LLC Limited | Construction | 2026 |
| Crete Greek Taverna Limited | Hospitality | 2026 |
| Crew Technology Consulting Limited | Information & communication | 2025 |
| Crig Limited | Health & social care | 2018 |
| Crimp Rock Ltd | Wholesale & retail | 2026 |
| Crissupport Ltd | Education | 2025 |
| CRISTALSHINE33 Ltd | Administrative & support | 2024 |
| Critter Chaos Ltd | Administrative & support | 2019 |
| Crochet Arcade Ltd | Arts & recreation | 2015 |
| Croft Timber Ltd | Wholesale & retail | 2014 |
| Croppershair-Mojosbarbers Ltd | Hospitality | 2022 |
| Cross Green Estates Limited | Real estate | 2017 |
| Cross International Transport Limited | Transport & logistics | 2019 |
| Crossens Kebab Ltd | Hospitality | 2025 |
| Crouch & Co Estates Limited | Real estate | 2026 |
| Crown Acquisitions Worldwide Limited | Real estate | 2007 |
| Crown Plumbing Limited | Construction | 2003 |
| Crownerich Limited | Wholesale & retail | 2014 |
| Crowther Distribution Ltd. | Wholesale & retail | 2002 |
| Croxton Court Management Company Limited | Households | 1975 |
| Croxton Holdings Ltd | Real estate | 2022 |
| Croziers of Birkdale Ltd | Hospitality | 2022 |
| Crumbs & Grind Co Ltd | Hospitality | 2025 |
| Cruze Ltd | Construction | 2016 |
| CRWAY01 Ltd | Real estate | 2025 |
| Cryptopig Ltd | Information & communication | 2023 |
| CS Broadcasting Ltd | Information & communication | 2018 |
| CTC Fitness Southport Limited | Arts & recreation | 2018 |
| CTH Residential Property Limited | Real estate | 2025 |
| CTR Milla UK Limited | Wholesale & retail | 2020 |