| Cnqs Consultants Ltd | Professional & scientific | 2021 |
| CNR Holdco Limited | Real estate | 2024 |
| CNR Ventures Limited | Financial services | 2018 |
| CO2 Cooling Company Ltd | Professional & scientific | 2020 |
| Coach 2 Serve Limited | Other services | 2016 |
| Coached by LIV Limited | Other services | 2025 |
| Coalescence Facilities Ltd | Financial services | 2024 |
| Coalmark Limited | | 1980 |
| Coasim Ltd | Wholesale & retail | 2025 |
| Coastal Navigators Network CIC | Professional & scientific | 2021 |
| Coastal Pubs Ltd | Hospitality | 2025 |
| Coastline Estates Ltd | Real estate | 2006 |
| Coats and Goalposts Ltd | Education | 2021 |
| Cobble Lane Market Ltd | Information & communication | 2025 |
| Cobnet Limited | Professional & scientific | 2025 |
| Cocinita Ltd | Hospitality | 2026 |
| Cocker Bar Farm Limited | Manufacturing | 2025 |
| Cocktails at Home UK Ltd | Wholesale & retail | 2021 |
| Code Beef Limited | Information & communication | 2011 |
| Code Choreography Limited | Information & communication | 2018 |
| Code Enforcer Limited | Information & communication | 2017 |
| Code RAY Ltd | Information & communication | 2019 |
| Code Velocity Labs Ltd | Information & communication | 2025 |
| Codecahedron Media Ltd | Information & communication | 2023 |
| Codegood Limited | Information & communication | 2014 |
| Codekris Luabs Ltd | Wholesale & retail | 2026 |
| CODEOPS360 Ltd | Information & communication | 2025 |
| Codes AI Limited | Wholesale & retail | 2024 |
| Codesmith Consulting Limited | Information & communication | 2019 |
| Codeus Tech Ltd | Information & communication | 2026 |
| Codynamic Limited | Information & communication | 2018 |
| Coffe Shop Limited | Hospitality | 2025 |
| Coffee and Much More Ltd | Hospitality | 2021 |
| Coffee Rules 103 Ltd | Hospitality | 2025 |
| Coffee Xpertiz Cavendish Ltd | Wholesale & retail | 2026 |
| Coffee Xpertiz Liverpool Ltd | Hospitality | 2025 |
| Coffee Xpertiz Ltd | Hospitality | 2024 |
| Coffee Xpertiz Manchester Ltd | Hospitality | 2025 |
| Coffee&Brunch Limited | Hospitality | 2025 |
| Cogent Futures Limited | Real estate | 2024 |
| Coggin Properties North West Limited | Real estate | 2024 |
| Cognify Solutions Limited | Information & communication | 2025 |
| Cognite Performance Ltd | Professional & scientific | 2017 |
| Cognitek Consulting Limited | Information & communication | 2025 |
| Cogogo Limited | Professional & scientific | 2023 |
| Coin LAB Ltd | Manufacturing | 2019 |
| Colburn Logistics Ltd | Transport & logistics | 2024 |
| Cole Connections Ltd | Administrative & support | 2025 |
| Cole Security Services Limited | Administrative & support | 2006 |
| Coleman Milne Limited | Professional & scientific | 1992 |
| Colgan Performance Limited | Arts & recreation | 2024 |
| Colin Corless Bolton Ltd | Water & waste | 2017 |
| Colin Jacques Limited | Professional & scientific | 2008 |
| Coll Civil Engineering Limited | Construction | 1980 |
| Collaborate IT Limited | Information & communication | 2022 |
| Collaborative Records Ltd | Information & communication | 2020 |
| College Motors (Bangor) Ltd | Wholesale & retail | 2010 |
| Colley's Estate Agent Ltd | Real estate | 2016 |
| Colley's Legal Services Ltd | Professional & scientific | 2016 |
| Collington Winter Environmental Limited | Professional & scientific | 2020 |
| Collington Winter Ltd | Professional & scientific | 2015 |
| Collington Winter Properties Limited | Real estate | 2017 |
| Collision Crew Accident Repair Ltd | Wholesale & retail | 2026 |
| Colnuter Ltd | Administrative & support | 2018 |
| Colony Health & Fitness Ltd | Arts & recreation | 2021 |
| Colophon Print & Design Limited | Manufacturing | 2015 |
| Colorfulartie Ltd | Wholesale & retail | 2023 |
| Colossal Roofing (NW) Ltd | Construction | 2025 |
| Colossal Scaffolding (NW) Ltd | Construction | 2025 |
| Colossus Studios Ltd | Information & communication | 2019 |
| Colossusboxinggymfarnworth Ltd | Arts & recreation | 2026 |
| Colour Blind ME Ltd | Information & communication | 2019 |
| Colour Software Limited | Information & communication | 2019 |
| Colour the Clouds Theatre Company | Arts & recreation | 2016 |
| Colourfield Publishing Limited | Information & communication | 2015 |
| Colourful Clay Limited | Information & communication | 2019 |
| Colourful Rain Ltd | Wholesale & retail | 2020 |
| Colouring Surah's Ltd | Manufacturing | 2026 |
| Colourofman Ltd | Wholesale & retail | 2012 |
| Colourofmyskin Coms Limited | Professional & scientific | 2023 |
| Colourworld Limited | | 1989 |
| Colquitt & Co Ltd | Construction | 2015 |
| Colquitt Consultancy Limited | Professional & scientific | 2022 |
| Cols Plumbing & Heating Ltd | Construction | 2022 |
| Coltech Scientific Limited | Extraterritorial | 2008 |
| Coltman Ltd | Real estate | 2020 |
| Coltman Software Engineering Limited | Information & communication | 2018 |
| Columbus Fifty Four Limited | Financial services | 2018 |
| Colvennor Consultants Ltd | Professional & scientific | 2016 |
| Combat Ticketing System (CTS) Ltd | Administrative & support | 2025 |
| Combined Funeral Plans Limited | Extraterritorial | 2016 |
| Combined Specialist Plant Hire Ltd | Administrative & support | 2026 |
| Comet Building Contractors Ltd | Construction | 2006 |
| Comfort Support Services Ltd | Health & social care | 2021 |
| Comfort Trader Limited | Wholesale & retail | 2021 |
| Comfort Zone Trading Ltd | Wholesale & retail | 2018 |
| Commerce Craft Limited | Wholesale & retail | 2024 |
| Commercial Refrigeration Store Ltd | Wholesale & retail | 2024 |
| Commerciall Limited | Real estate | 2024 |
| Commerza Ltd | Wholesale & retail | 2018 |