| Chuckles Private Day Nursery Ltd | Health & social care | 2025 |
| Church Green Investments Ltd | Real estate | 2022 |
| Circledaily Ltd | Wholesale & retail | 2024 |
| City Atmosphere Group Ltd | Real estate | 2021 |
| City Atmosphere Limited | Real estate | 2016 |
| Cityplus Logistics Ltd | Transport & logistics | 2025 |
| Civentra Technologies Ltd | Information & communication | 2026 |
| Clamart Ltd | Hospitality | 2015 |
| Clarence Barclay Ltd | Real estate | 2018 |
| Classic Beds (UK) Ltd | Manufacturing | 2012 |
| Claypot Foods Ltd | Hospitality | 2024 |
| Cleanhaus Ltd | Administrative & support | 2025 |
| Cleanli-Ness Cleaning Ltd | Administrative & support | 2022 |
| Cleggy's Limited | Construction | 2002 |
| Clickonomics Limited | Professional & scientific | 2023 |
| Cloud 7 Sleep Ltd | Wholesale & retail | 2019 |
| Cloud 9YN Ltd | Manufacturing | 2024 |
| Cloudyheaven Ltd | Wholesale & retail | 2023 |
| Cloverleaf Advocacy 2000 Ltd. | Health & social care | 1999 |
| Club Gaia UK Limited | Extraterritorial | 2002 |
| Cobalt Property Group Ltd | Real estate | 2025 |
| Cobweb Properties Ltd | Real estate | 2025 |
| Cofetarie Romaneasca Ltd | Hospitality | 2022 |
| Coffee Park Ltd | Hospitality | 2025 |
| Coil Sprung Beds Limited | Manufacturing | 2018 |
| Collage Designs Limited | Extraterritorial | 1991 |
| Collie Russell Ltd | Real estate | 2026 |
| Color Coating Ltd | Construction | 2019 |
| Colour-Point Distribution Ltd | Wholesale & retail | 2018 |
| Come 4 Sleep Limited | Manufacturing | 2015 |
| Comfort Crafted Ltd | Manufacturing | 2025 |
| Comfort Quality Furniture Ltd | Manufacturing | 2023 |
| Comfort UK Properties Ltd | Real estate | 2021 |
| Comfort Zone Beds Ltd | Wholesale & retail | 2025 |
| Comfur Sleep Beds Ltd | Manufacturing | 2020 |
| Comfy Chair Ltd | Manufacturing | 2024 |
| Comfy Deluxe Ltd | Manufacturing | 2016 |
| Comfy Dreams Limited | Manufacturing | 2019 |
| Comfy Sleeps Home Ltd | Wholesale & retail | 2020 |
| Comfy Soul Retail Ltd | Wholesale & retail | 2025 |
| Comfydots Ltd | Wholesale & retail | 2020 |
| Commercecoach Ltd | Information & communication | 2025 |
| Commercial Utopia Limited | Wholesale & retail | 2024 |
| Commissioning Firm Limited | Professional & scientific | 2016 |
| Complete Feet Care Limited | Health & social care | 2016 |
| Completeservices Limited | Construction | 2012 |
| Composite Direct Limited | Manufacturing | 2019 |
| Concrete Taxi Limited | Manufacturing | 2013 |
| Concrete Taxi Readymix Ltd | Manufacturing | 2023 |
| Conrad Interiors Ltd | Wholesale & retail | 2022 |
| Conservatory Solutions Limited | Manufacturing | 2000 |
| Consultancy Pro UK Limited | Other services | 2019 |
| Cooks Mill Ltd | Wholesale & retail | 2012 |
| Copal Asset Management Limited | Other services | 2013 |
| Core Compliance Management Services Ltd | Professional & scientific | 2026 |
| Coretech Diamond Services Ltd | Construction | 2018 |
| Cosmic Living Ltd | Manufacturing | 2021 |
| Cosy Beds Ltd | Manufacturing | 2024 |
| Counter Corrosion Engineering Limited | Manufacturing | 1984 |
| Courage to Grow Counselling Therapy Services Limited | Agriculture & fishing | 2023 |
| Courierhub Ltd | Transport & logistics | 2023 |
| Courtesy Cars R US Ltd | Professional & scientific | 2025 |
| Couture Living Limited | Manufacturing | 2017 |
| Couture Living Retail Limited | Wholesale & retail | 2020 |
| Cozy Lino Ltd | Wholesale & retail | 2025 |
| Cozy Nights Limited | Manufacturing | 2013 |
| CP HQ Operations Ltd | Manufacturing | 2024 |
| CPG Refinishing Ltd | Wholesale & retail | 2025 |
| Craftedcomfort Limited | Wholesale & retail | 2025 |
| Craig's Motorcycles Limited | Wholesale & retail | 2008 |
| Craven Crombie Limited | Professional & scientific | 2003 |
| Creamy Bakehouse Ltd | Hospitality | 2026 |
| Creativ Sync Ltd | Professional & scientific | 2025 |
| Crepnology Ltd | Wholesale & retail | 2020 |
| Crochet Magic Ltd | Wholesale & retail | 2020 |
| Croft Properties (Dewsbury) Limited | Real estate | 2024 |
| Crossley Healthcare Ltd | Health & social care | 2020 |
| Crossley Investments Ltd | Financial services | 2021 |
| Crossmann Builders and Contractors Ltd | Construction | 2012 |
| Crossmann Glass Limited | Manufacturing | 1998 |
| Crownbella Ltd | Health & social care | 2016 |
| Crownstone Financial & Management Ltd | Professional & scientific | 2025 |
| Crumb N GET IT Ltd | Manufacturing | 2025 |
| Crumbz Gourmet Ltd | Hospitality | 2016 |
| Crystal Ears Limited | Health & social care | 2021 |
| Crystallinedesign Limited | Construction | 2020 |
| CS Eco Compliance Ltd | Professional & scientific | 2026 |
| CS Vehicle Solutions Ltd | Wholesale & retail | 2019 |
| CSH Interiors Ltd | Manufacturing | 2019 |
| CT Willow Joinery Limited | Manufacturing | 2013 |
| Ctfx Ltd | Administrative & support | 2017 |
| Ctrl Z Entertainment Ltd | Wholesale & retail | 2025 |
| Curatedsales Limited | Wholesale & retail | 2025 |
| Curo Health Limited | Health & social care | 2014 |
| Curry House and Pizza Limited | Hospitality | 2026 |
| Curt Bros Limited | Transport & logistics | 2025 |
| Cutech Solutions Ltd | Other services | 2024 |
| Cuttsmedia Ltd | Professional & scientific | 2025 |
| CWC 100 Ltd | Hospitality | 2022 |
| Cyber Park Management Limited | Real estate | 2021 |