| Carbis Bay Holdings Limited | Truro | 2020 |
| Carbis Bidco Limited | Cardiff | 2025 |
| Carbis Filtration Holdings Limited | Stockton On Tees | 2019 |
| Carbis Holdco Limited | Cardiff | 2025 |
| Carbis Midco 1 Limited | Cardiff | 2025 |
| Carbis Midco 2 Limited | Cardiff | 2025 |
| Carbis Partners Limited | London | 2020 |
| Carbis Topco Limited | Cardiff | 2025 |
| Carbline Holdings Limited | London | 2025 |
| Carbline Limited | London | 2021 |
| Carblitt Limited | Coventry | 2018 |
| Carbo Holdings Limited | London | 2024 |
| Carbon 10 Group Limited | Reading | 2016 |
| Carbon 50 Limited | London | 2015 |
| Carbon Asset Solutions Ltd | London | 2021 |
| Carbon Bidco Limited | Leamington Spa | 2020 |
| Carbon CAP Limited | London | 2018 |
| Carbon Corporate Finance Limited | Manchester | 2019 |
| Carbon FC (Cambridge) Ltd | Hertford | 2021 |
| Carbon FC (Oxford) Ltd | Oxford | 2018 |
| Carbon FC Limited | London Bridge | 2008 |
| Carbon Financial Holdings Limited | Edinburgh | 2010 |
| Carbon Fitness Holdings Limited | Wells | 2024 |
| Carbon Free Investing Ltd | London | 2017 |
| Carbon Funding Consultants Cambridge Ltd | Hertford | 2021 |
| Carbon Funding Partners Limited | Cowbridge | 2019 |
| Carbon Holdings Limited | London | 2021 |
| Carbon Husky Limited | Exeter | 2018 |
| Carbon Ibank Limited | St. Neots | 2023 |
| Carbon II Bidco Limited | Leeds | 2020 |
| Carbon II Midco 1 Limited | Leeds | 2020 |
| Carbon II Midco 2 Limited | Leeds | 2020 |
| Carbon II Midco 3 Limited | Leeds | 2020 |
| Carbon INS Partners Ltd | London | 2026 |
| Carbon Jungle Limited | St Margarets | 2025 |
| Carbon Market Systems Limited | London | 2022 |
| Carbon Neutral Investments Ltd | Solihull | 2022 |
| Carbon Nexus Group Ltd | Llandudno | 2017 |
| Carbon Numbers Investments Ltd | Colchester | 2020 |
| Carbon Order AR Limited | Tisbury | 2018 |
| Carbon Order Investments NO 1 Limited | Salisbury | 2012 |
| Carbon Order Investments NO 2 Limited | Tisbury | 2018 |
| Carbon Order Ltd | Salisbury | 2011 |
| Carbon Order Management Limited | Milngavie | 2012 |
| Carbon Private Clients Ltd | London Bridge | 2024 |
| Carbon Products Limited | Sheffield | 2022 |
| Carbon Rewind Holdings Limited | Watford | 2021 |
| Carbon Safe Limited | Colchester | 2021 |
| Carbon Saving Group Holdings Limited | Plymouth | 2021 |
| Carbon Solutions Holdings Ltd | Chichester | 2021 |
| Carbon Topco Limited | Leamington Spa | 2020 |
| Carbon Trust Enterprises Limited | London | 2004 |
| Carbon Trust International Limited | London | 2009 |
| Carbon Trust Investments Limited | London | 2003 |
| Carbon Underwriting Limited | London | 2018 |
| Carbon Zero Holdings Ltd | Gorebridge | 2020 |
| Carbon Zero Micro Finance Limited | Edinburgh | 2021 |
| Carboncause Ltd | London | 2024 |
| Carboncoin Limited | Lincoln | 2025 |
| Carbonflowglobal Ltd | Glasgow | 2025 |
| Carbonite Investments Limited | Marlow | 2024 |
| Carbonplace Limited | London | 2022 |
| Carbonplace Matched Principal Limited | London | 2024 |
| Carbonplace UK Limited | London | 2022 |
| Carbopellet PLC | London | 2024 |
| Carboverse Group Holdings Ltd | Worcester Park | 2025 |
| Carbro Group Ltd | Leeds | 2026 |
| Carbrook Limited | Sutton Coldfield | 2025 |
| Carburettor Holding Ltd | Banbury | 2023 |
| Carbury Ventures Limited | Letchworth Garden City | 2017 |
| Carcal Holdings Limited | Leeds | 2020 |
| Carcamoli Holding Limited | London | 2020 |
| Carcanet Property Limited | Fakenham | 2019 |
| Carcary Holdings Ltd | Sevenoaks | 2024 |
| Carcharodon Holdings Limited | York | 2026 |
| Carcloud Solutions Limited | Birmingham | 2024 |
| Carco PRP Limited | London | 2015 |
| Carconnect Finance Limited | Lincoln | 2024 |
| Carcraft IP Co Limited | Manchester | 2015 |
| Carcraig Capital Holdings Limited | Rosyth | 2021 |
| Card Consultant Services Limited | Newcastle Upon Tyne | 2025 |
| Card Culture by Lewis Hamilton Limited | London | 2026 |
| Card Culture SPV Limited | London | 2026 |
| Card Innovations Ltd | Brighton | 2005 |
| Card PAY Accept Ltd | Waterlooville | 2019 |
| Card Protection Plan Limited | London | 1980 |
| Card Saver Ltd | Fleetwood | 2014 |
| Card Terminal Payment Systems Limited | Belfast | 2019 |
| Card Transact Limited | Romford | 2016 |
| Cardaenea Limited | Woking | 2017 |
| Cardale Finance Limited | Leeds | 2019 |
| Cardale Nominees Limited | Harrogate | 2003 |
| Cardamon Investments Unlimited | London | 2026 |
| Cardamon Ltd | London | 2025 |
| Cardan (PFP) Ltd | Worcester | 2025 |
| Cardan Holdings Ltd | Blantyre | 2016 |
| Cardano Advisory Limited | London | 2007 |
| Cardano Enterprise Ltd | Solihull | 2025 |
| Cardaq Information Services Limited | London | 2020 |
| Cardaq Limited | London | 2011 |