| Cain Holdings Limited | Stoke-On-Trent | 2015 |
| Cain HOY Finance Limited | London | 2014 |
| Cain International Advisers Limited | London | 2016 |
| Cain International Agent Limited | London | 2017 |
| Cain Investments Limited | Stoke-On-Trent | 2020 |
| Cain PE (UK) Limited | London | 2018 |
| Cain Tree Ltd | Reading | 2024 |
| Caio Capital Ltd | Leicester | 2025 |
| Caio Holding Company Limited | London | 2023 |
| Cairb Limited | London | 2020 |
| Cairellot Investments Limited | Glasgow | 2021 |
| Caireval Holdings Limited | London | 2024 |
| Cairlinn Holdings Limited | Stockton-On-Tees | 2020 |
| Cairn Capital Limited | Telford | 2020 |
| Cairn Corporate Ltd. | Kirkcaldy | 2011 |
| Cairn Cross (Group) Limited | Leeds | 2016 |
| Cairn Financial Management Limited | Glasgow | 2018 |
| Cairn Group Holdings Limited | Newcastle Upon Tyne | 2026 |
| Cairn Health Ltd | Aboyne | 2024 |
| Cairn Independent Limited | Kirkcaldy | 1993 |
| Cairn Mortgages Limited | Ilfracombe | 2024 |
| Cairn Ridge Capital Ltd | Aberdeen | 2024 |
| Cairnborrow Wind Energy Holdings Limited | London | 2018 |
| Cairnburn Holdings Limited | Belfast | 2018 |
| Cairnburn Investments Limited | Belfast | 1998 |
| Cairncastle House Limited | Belfast | 2024 |
| Cairnfair Limited | Glasgow | 2018 |
| Cairngorm LDA Limited | Harpenden | 2025 |
| Cairnhill Management Resources Limited | Stockport | 2008 |
| Cairnrock Partners Ltd | London | 2021 |
| Cairns & Longmuir Holdings Ltd | Motherwell | 2020 |
| Cairns Holdings Limited | Old Hatfield | 2014 |
| Cairns Investco Limited | Dundee | 2026 |
| Cairnstone Capital Ltd | Dunfermline | 2024 |
| Cairnwood Reserve Limited | Aberdeen | 2025 |
| Cairo Group Limited | London | 2019 |
| Cairus Holdings Limited | Birmingham | 2015 |
| Cairus Limited | Birmingham | 2022 |
| Cais Enterprise Limited | Telford | 2026 |
| Cais Holdings Limited | Telford | 2026 |
| Cais Investments Limited | Telford | 2026 |
| Caishen Wealth Management Limited | London | 2026 |
| Caislean Holdings (UK) Limited | London | 2018 |
| Caissa Holdings Limited | London | 2021 |
| Caisson IO Group Limited | London | 2022 |
| Caister 2025 Limited | London | 2025 |
| Caister Group Limited | Great Yarmouth | 2025 |
| Caithcroft Limited | London | 1972 |
| Caithness & Co Limited | Surbiton | 1974 |
| Caius Capital Services Limited | London | 2016 |
| Caixa 8 Savings & Loan Ltd | Cardiff | 2021 |
| Caiyside Consulting Ltd | Dunbar | 2009 |
| Cajc Limited | Pinner | 2025 |
| Cajoled Holdings Limited | 46-54 Great Titchfield Street | 2022 |
| Cajr Holdings Ltd | Glasgow | 2025 |
| Cajun Corner UK Limited | London | 2025 |
| Cajun-Dragon Limited | London | 2024 |
| Cakapa Ltd | Ballygawley | 2021 |
| Cake Create Holding Limited | London | 2022 |
| Cake Crew Topco Limited | Bala | 2024 |
| Cake Entertainment Limited | London | 2002 |
| Cake Holdco Limited | Leeds | 2025 |
| Cake Holdings Limited | Liverpool | 2008 |
| Cake Positive Limited | Faringdon | 2011 |
| Cakenation Holdings Limited | Croydon | 2026 |
| Caketon Ltd | Manchester | 2024 |
| CAL Affinius European Debt Holdco Limited | London | 2025 |
| CAL Affinius European Debt Lendco 1 Limited | London | 2025 |
| CAL Affinius European Debt Lendco 2 Limited | London | 2026 |
| CAL Affinius European Debt Lendco 3 Limited | London | 2026 |
| CAL Affinius European Debt Lendco 4 Limited | London | 2026 |
| CAL Affinius European Debt Lendco 5 Limited | London | 2026 |
| CAL Affinius European Debt Lendco 6 Limited | London | 2026 |
| CAL Affinius European Debt Lendco 7 Limited | London | 2026 |
| CAL Architects UK Limited | East Grinstead | 2023 |
| CAL Holdings Limited | Keighley | 2015 |
| CAL Investment Holding Limited | London | 2023 |
| CAL Investments Limited | London | 1980 |
| CAL Logistics Reit UK Limited | London | 2024 |
| CAL North Limited | Godalming | 2025 |
| CAL UK Holdings Limited | London | 2025 |
| Cala (Esop) Trustees Limited | Staines-Upon-Thames | 1996 |
| Cala 1999 Limited | Midlothian | 1999 |
| Cala Social Capital Ltd | London | 2011 |
| Calabria Holdings Limited | Grantham | 2024 |
| Calabria Investments Limited | London | 2021 |
| Calabritto Limited | London | 2014 |
| Calachem Holding Limited | Manchester | 2015 |
| Calachem Ltd | Manchester | 2005 |
| Caladan Capital Ltd | Reading | 2022 |
| Caladanian Holding Limited | Monks Eleigh | 2007 |
| Caladen Consulting (Holdings) Limited | Brierley Hill | 2025 |
| Calael Consulting Limited | Southwick | 2022 |
| Calam Holdings Ltd | Leeds | 2025 |
| Calamanco Risk Solutions Ltd | Irlam | 2008 |
| Calamari 2025 Ltd | Harrogate | 2025 |
| Calanais Pension Trustee Company Limited | Manchester | 2000 |
| Calangate Investments and Finance Limited | Harrow | 1987 |
| Calanne Limited | Flinton | 2008 |
| Calanques Real Estate Limited | London | 2022 |