| Caimas Kitchens Limited | Administrative & support | 2006 |
| Cain Enabled Ltd | Construction | 2025 |
| Cain Smith Copywriter Limited | Professional & scientific | 2023 |
| Caines GAS Engineering Ltd | Construction | 2023 |
| Caips UK Ltd | Administrative & support | 2020 |
| Cairn Medical Services Limited | Health & social care | 2022 |
| Cairnvale Ltd | Professional & scientific | 2002 |
| Cairo International Ltd | Wholesale & retail | 2025 |
| Cairo Properties Ltd | Real estate | 2023 |
| Cairo Tower Ltd | Wholesale & retail | 2021 |
| Cairo Vipes Ltd | Wholesale & retail | 2025 |
| Caison Consulting Ltd | Health & social care | 2019 |
| Caistor Limited | Real estate | 2012 |
| Cait Ellen Ltd | Professional & scientific | 2026 |
| Caixia Global Ltd | Wholesale & retail | 2026 |
| Cajar Developments Limited | Professional & scientific | 2012 |
| Cajusoly Ltd | Wholesale & retail | 2025 |
| Cake Bistro Ltd | Wholesale & retail | 2023 |
| Cake Box Didsbury Ltd | Hospitality | 2023 |
| Cake Box Harpurhey Limited | Hospitality | 2020 |
| Cake Counselling Ltd | Health & social care | 2025 |
| Cake Inn Longsight Ltd | Manufacturing | 2024 |
| Cake Your Day Ltd | Wholesale & retail | 2024 |
| Cakebread Workshop Ltd | Arts & recreation | 2018 |
| Cakemerina Ltd | Manufacturing | 2025 |
| Cakes by Hassan Limited | Manufacturing | 2023 |
| Cakes@Bluemist Ltd | Other services | 2021 |
| Cakesforall Limited | Manufacturing | 2025 |
| Caketon Ltd | Financial services | 2024 |
| Cakies Ltd | Manufacturing | 2019 |
| CAL Site Services Ltd | Construction | 2025 |
| CAL Software Ltd | Professional & scientific | 2024 |
| Cala Casa Limited | Real estate | 2021 |
| Cala D'Or Property Investments Ltd | Real estate | 2011 |
| Calachem Holding Limited | Financial services | 2015 |
| Calachem Ltd | Financial services | 2005 |
| Calachem Pension Trustees Ltd | Professional & scientific | 2005 |
| Calanais Pension Trustee Company Limited | Financial services | 2000 |
| Calbaye UK Ltd. | Professional & scientific | 2015 |
| Calcoffee Ltd | Hospitality | 2022 |
| Calculator Common Limited | Extraterritorial | 2025 |
| Calculus Accountants Limited | Professional & scientific | 2009 |
| Calder Central UK Ltd | Construction | 2020 |
| Calder Debt Recovery Limited | Professional & scientific | 1993 |
| Calder Street Management (Manchester) Limited | Households | 2012 |
| Calder Valley Counselling Ltd | Health & social care | 2022 |
| Calder-Mckenzie Limited | Extraterritorial | 2012 |
| Calderbank 36 Ltd | Real estate | 2009 |
| Calderdale Hospital SPC Financing PLC | Financial services | 2020 |
| Calderdale Hospital SPC Holdings Ltd | Construction | 1998 |
| Calderdale Hospital SPC Ltd | Construction | 1998 |
| Calderdale Medical Services Ltd | Health & social care | 2025 |
| Caldergreen Ltd | Extraterritorial | 2001 |
| Caldermont Private Finance Ltd | Financial services | 2026 |
| Caldero Limited | Information & communication | 2014 |
| Calderwood Street Ltd | Other services | 2017 |
| Caldicot Retail Ltd | Real estate | 2024 |
| Caldor Limited | Construction | 2018 |
| Caldwell Hardware (UK) Limited | Manufacturing | 1953 |
| Caldy Limited | | 1984 |
| Cale Signs Limited | Manufacturing | 2023 |
| Caledonian Consultancy Ltd | Hospitality | 2022 |
| Caleendus Limited | Health & social care | 2022 |
| Caleli Gifts Ltd | Wholesale & retail | 2025 |
| Calenwind Co., Ltd | Wholesale & retail | 2026 |
| Calgall Ltd | Wholesale & retail | 2019 |
| Calgarth Holdings Ltd | Financial services | 2025 |
| Calibre Consulting Engineers Ltd | Professional & scientific | 2024 |
| Calibre Global Consulting Ltd | Administrative & support | 2025 |
| Calibre Sports Limited | Professional & scientific | 2024 |
| Calibrtr Ltd | Information & communication | 2024 |
| Calic Concepts Ltd | Professional & scientific | 2011 |
| Calicohawk Limited | Real estate | 2025 |
| Calidad Originals Ltd | Manufacturing | 2025 |
| California Express Wines Limited | Wholesale & retail | 2023 |
| California Wines Express Limited | Wholesale & retail | 2018 |
| Caligrill Ltd | Hospitality | 2025 |
| Calis MCR Limited | Hospitality | 2023 |
| Calisen Asset Management Limited | Professional & scientific | 2010 |
| Calisen Group (Holdings) Limited | Financial services | 2020 |
| Calisen Holdco 2 Limited | Financial services | 2016 |
| Calisen Holdco 3 Limited | Financial services | 2016 |
| Calisen Holdco 4 Limited | Professional & scientific | 2007 |
| Calisen Impact Charitable Trust | Health & social care | 2023 |
| Calisen International Holdings Limited | Financial services | 2017 |
| Calisen Limited | Financial services | 2020 |
| Calisen Meter Fit Limited | Administrative & support | 2015 |
| Calisen Meter Serve Holdco Limited | Financial services | 2007 |
| Calisen Smart 360 Limited | Administrative & support | 2021 |
| Call a Car Private Hire Limited | Information & communication | 2008 |
| Call Centre Helper Holdings Limited | Information & communication | 2024 |
| Call Centre Helper Limited | Information & communication | 2022 |
| Call for a Trip Co Ltd | Wholesale & retail | 2025 |
| Call IT Anything Ltd | Hospitality | 2016 |
| Call ME Kpop Ltd | Wholesale & retail | 2025 |
| Call Pall Limited | Health & social care | 2020 |
| Call Plus | Health & social care | 1992 |
| Call the Plumber Ltd | Construction | 2014 |
| CALL-4-BEAUTY Ltd | Other services | 2025 |
| Call-Tech IT Solutions Ltd | Information & communication | 2025 |