| Clayton Foods Limited | Hospitality | 2019 |
| CLC Studio Ltd | Arts & recreation | 2025 |
| Clck Properties Ltd | Real estate | 2020 |
| Clean House Specialist Ltd | Administrative & support | 2026 |
| Clean Page Design Limited | Information & communication | 2011 |
| Cleaning Crystal Clear Ltd | Administrative & support | 2025 |
| Cleanmoveexperts Ltd | Transport & logistics | 2025 |
| Cleansafe Ltd | Wholesale & retail | 2008 |
| Clear Asset Services Limited | Professional & scientific | 2025 |
| Clear Ears Audiology Ltd | Health & social care | 2022 |
| Clear Lane Driving Academy Ltd | Education | 2025 |
| Clear Solutions Ltd | Administrative & support | 2019 |
| Clear Travel Limited | Administrative & support | 2011 |
| Clear Value Trading Limited | Wholesale & retail | 2008 |
| Clear Watch Security Limited | Administrative & support | 2008 |
| Clearance Plug Ltd | Wholesale & retail | 2025 |
| Clearcoat (North West) Limited | Administrative & support | 2006 |
| Clearcycle Polymers Limited | Water & waste | 2026 |
| Clearlake Asset Management Ltd | Real estate | 2024 |
| Clearlands & Mcnamaras Environmental Services Ltd | Professional & scientific | 2016 |
| Cleartax Accountancy Services Ltd | Professional & scientific | 2026 |
| Clearvanta Ltd | Professional & scientific | 2026 |
| Clearwater Coaching Ltd | Other services | 2021 |
| Clegg Civil Contractors Limited | Construction | 2023 |
| Clegg UK Properties Ltd | Construction | 2026 |
| Cleken Limited | Construction | 2025 |
| Clemcious Ltd | Real estate | 2017 |
| Clerkwell Properties Ltd | Real estate | 2017 |
| Clibate Healthcare Limited | Health & social care | 2014 |
| Click Loft Ltd | Wholesale & retail | 2025 |
| Click&Buy Shop Ltd | Wholesale & retail | 2025 |
| Clicknest Commerce Limited | Wholesale & retail | 2026 |
| Cliff Hill Engineering Services Ltd | Professional & scientific | 2023 |
| Clifton Healthcare Limited | Health & social care | 2013 |
| Clifton NW Ltd | Administrative & support | 2022 |
| Climbhi Training Ltd | Professional & scientific | 2026 |
| Climbtex Ltd | Construction | 2012 |
| Clina Ltd | Administrative & support | 2023 |
| Clineco Ltd | Wholesale & retail | 2024 |
| Clining Services Ltd | Wholesale & retail | 2023 |
| Clipso Hair Limited | Administrative & support | 2008 |
| Clive Rainford Homes Limited | Construction | 2016 |
| CLJ Consultants (UK) Limited | Professional & scientific | 2019 |
| CLJ Investigations Ltd | Administrative & support | 2025 |
| Clock Tower View Management Company Limited | Households | 2018 |
| Close Protection UK Limited | Administrative & support | 2006 |
| Clothing RP Ltd | Wholesale & retail | 2026 |
| Cloud 29 AI Ltd | Information & communication | 2025 |
| Cloud Beauty by Hannah Frances Ltd | Other services | 2024 |
| Cloud Beauty Uppermill LLP | | 2021 |
| Cloud Optical Limited | Health & social care | 2024 |
| Cloud Prism Ltd | Wholesale & retail | 2026 |
| Cloudore Limited | Information & communication | 2025 |
| Cloudside Outdoor Pursuits Limited | Arts & recreation | 1989 |
| Cloughpark Limited | Financial services | 2020 |
| CM Trade Supplies Ltd | Wholesale & retail | 2025 |
| Cm&F Services Ltd | Manufacturing | 2019 |
| CMA Engineering Services Ltd | Professional & scientific | 2017 |
| Cmayfield Ltd | Professional & scientific | 2023 |
| CMC Living Limited | Real estate | 2020 |
| CMS Electrical Contractors Limited | Construction | 2022 |
| CMS Heating and Plumbing Ltd | Construction | 2014 |
| CMT Textiles Ltd | Manufacturing | 2021 |
| CN Signs Ltd | Professional & scientific | 2017 |
| CNC Motion Ltd | Information & communication | 2017 |
| CNC Profile Engineering Limited | Professional & scientific | 2002 |
| CNM Restoration Limited | Construction | 2009 |
| CNS Dental Care Ltd | Health & social care | 2016 |
| Co Community CIC | Professional & scientific | 2021 |
| Coach and Horses Waterhead Limited | Hospitality | 2004 |
| Cobblestones Trading and Investments Ltd | Real estate | 2019 |
| Cobden Estates Limited | Households | 2023 |
| Coborn Road Developments Limited | Construction | 2025 |
| Cobra Consultant Limited | Information & communication | 2019 |
| Cobra Knitwear Ltd | Manufacturing | 2020 |
| Cobra Textiles Ltd | Manufacturing | 2014 |
| Coco Locums Ltd | Professional & scientific | 2019 |
| Cocomo Ltd | Wholesale & retail | 2018 |
| Code and Custom Ltd | Professional & scientific | 2026 |
| Coemma Ltd | Real estate | 2025 |
| Coffee at the Pavillion Limited | Hospitality | 2022 |
| Coffee Cove Co Limited | Hospitality | 2024 |
| Coffee Expression Ltd | Manufacturing | 2022 |
| Coffee Fuelled Creative Ltd | Wholesale & retail | 2022 |
| Cognitions (North West) Limited | Education | 2008 |
| Cognitive Behavioural Approach Ltd | Health & social care | 2014 |
| Cognitura AI Limited | Wholesale & retail | 2025 |
| Cognixus Limited | Wholesale & retail | 2025 |
| Cognothink Ltd | Professional & scientific | 2025 |
| Cohens Properties Ltd | Real estate | 2024 |
| Cohiba Real Estate Ltd | Real estate | 2021 |
| Coin and Collectible Limited | Wholesale & retail | 2025 |
| Coin Overseas Holdings Limited | Professional & scientific | 1998 |
| Cold Build (UK) Ltd | Construction | 2008 |
| Coldhurst Convenience Ltd | Wholesale & retail | 2024 |
| Coldhurst Office Ltd | Real estate | 2026 |
| Coldhurst Properties Limited | Real estate | 2024 |
| Cole Street (Birkenhead) Management Limited | Households | 2024 |
| Cole's Physiotherapy Limited | Other services | 2010 |
| Coleman Contracting Ltd | Information & communication | 2023 |