| Cafe CUP Limited | Hospitality | 2023 |
| Cafe NE1 Ltd | Hospitality | 2025 |
| Cafe Spice New Ltd | Hospitality | 2017 |
| Cafe Twentyone Newcastle Limited | Hospitality | 1987 |
| CAFE11 Limited | Hospitality | 2024 |
| CAG Enterprises Ltd | Wholesale & retail | 2022 |
| Cage-Tech Ltd | Construction | 2025 |
| Cagri Crown Ltd | Wholesale & retail | 2020 |
| Cailleach Computing Ltd | Information & communication | 2021 |
| Cailleach Holdings Ltd | Financial services | 2021 |
| Cainhurst Solutions Ltd | Information & communication | 2026 |
| Cairn Group Holdings Limited | Financial services | 2026 |
| Cairney House RTM Company Limited | Households | 2004 |
| Cakebox Newcastle Ltd | Wholesale & retail | 2017 |
| Cakes Classes and Cutters Ltd | Extraterritorial | 2017 |
| Cakeville Patisserie Limited | Manufacturing | 2025 |
| CAL Partners Limited | Professional & scientific | 2015 |
| Calcutt Ltd | Wholesale & retail | 2025 |
| Caldar International Holdings Ltd | Financial services | 2025 |
| Caldar International Ltd | Transport & logistics | 2025 |
| Calderdale Home Care Limited | Health & social care | 2009 |
| Caledonian City Developments Limited | Extraterritorial | 1988 |
| Caledonian Farms Limited | Extraterritorial | 1986 |
| Caledonian Trust Limited | Real estate | 1972 |
| Calenergy GAS (Holdings) Limited | Financial services | 1992 |
| Calenergy GAS Limited | Mining & quarrying | 2002 |
| Calenergy Resources (Australia) Limited | Mining & quarrying | 2008 |
| Calenergy Resources (Operator) Limited | Financial services | 2024 |
| Calenergy Resources (UK) Limited | Mining & quarrying | 2019 |
| Calenergy Resources Limited | Administrative & support | 2002 |
| Calenergy SNS Limited | Mining & quarrying | 2013 |
| Calibre Secured Networks Ltd | Information & communication | 2008 |
| Call Collaboration Solutions Ltd | Information & communication | 2016 |
| Calleja Properties Limited | Real estate | 2024 |
| Callerton Consulting Limited | Information & communication | 2016 |
| Callerton Gate Management Company Limited | Real estate | 2013 |
| Callerton Properties Ltd | Real estate | 2024 |
| Calling Property Limited | Real estate | 2024 |
| Callisto Education Ltd. | Information & communication | 2025 |
| Callora Ltd | Real estate | 2025 |
| Calm-Heaven Ltd | Administrative & support | 2026 |
| Calorie Balance Limited | Wholesale & retail | 2018 |
| Calwin Ltd | Information & communication | 2012 |
| Calz Limited | Extraterritorial | 2023 |
| CAM Catering Limited | Hospitality | 2024 |
| CAM Installations Ltd | Construction | 2019 |
| Camarón Bonite Limited | Administrative & support | 2021 |
| Camber Studio Ltd | Professional & scientific | 2026 |
| Cambia Ltd | Professional & scientific | 2026 |
| Cambridge College Limited | Education | 2022 |
| Cambridge Growth Company Limited | Other services | 2024 |
| Cambridge Place Management Company Limited | Households | 2012 |
| Cambridge Scale UK Ltd | Other services | 2018 |
| Cambridge Scholars Publishing Ltd | Information & communication | 2001 |
| Cambridge Training & Consultancy Global Ltd | Education | 2023 |
| Came From Nothing Marketing Ltd | Construction | 2020 |
| Cameo Canes Ltd | Manufacturing | 2024 |
| Cameron Builders Newcastle (Holdings) Limited | Financial services | 2018 |
| Cameron's Builders (Newcastle) Limited | Construction | 1973 |
| Campbell Properties Limited | Real estate | 1980 |
| Campbell's Antiques Limited | Wholesale & retail | 2022 |
| Campbell's Mini BUS Hire Limited | Transport & logistics | 2010 |
| Camron (North East) Limited | Real estate | 1996 |
| Camry Trading Limited | Wholesale & retail | 2024 |
| Camu Properties Limited | Construction | 2017 |
| Camycamy Ltd | Construction | 2021 |
| CAN Child Psychiatry Ltd | Health & social care | 2025 |
| CAN Consultants Limited | Information & communication | 2002 |
| CAN DO Business Solutions Ltd | Professional & scientific | 2016 |
| CAN DO Communications (UK) Ltd. | Information & communication | 2017 |
| CAN X Consult Ltd | Professional & scientific | 2020 |
| Can-Am Chains( Europe) Ltd | Manufacturing | 2006 |
| Can-U-Hack-It Limited | Information & communication | 1997 |
| Canapes Catering NE Ltd | Hospitality | 2026 |
| Candlelight 747 Healthcare Ltd | Health & social care | 2021 |
| Candlish Properties Limited | Real estate | 2020 |
| Candy Creams Ltd | Other services | 2023 |
| Canico Holdings Limited | Financial services | 2020 |
| Canis Training Ltd | Other services | 2021 |
| Canko Consultancy Ltd | Professional & scientific | 2023 |
| Cannord Limited | Real estate | 2021 |
| Canny Academy Ltd | Education | 2025 |
| Canny Bonny Ltd | Wholesale & retail | 2025 |
| Canny Clever Business Limited | Information & communication | 2021 |
| Canny Clever Group Limited | Wholesale & retail | 2024 |
| Canny Clever Infrastructure Limited | Real estate | 2022 |
| Canny Clever Morpeth Limited | Information & communication | 2025 |
| Canny Clever Retail Operations Limited | Wholesale & retail | 2020 |
| Canny Clever Trading Operations 1 Limited | Wholesale & retail | 2022 |
| Canny COD NCL Ltd | Hospitality | 2025 |
| Canny Crafty Ltd | Arts & recreation | 2017 |
| Canny Crystals Ltd | Wholesale & retail | 2022 |
| Canny Folk Ltd | Financial services | 2020 |
| Canny People HR Ltd | Administrative & support | 2023 |
| Canny Queer Collective CIC | Arts & recreation | 2024 |
| Canny-Fest Ltd | Administrative & support | 2024 |
| Cannyworks Ltd | Professional & scientific | 2025 |
| Cans R US Limited | Wholesale & retail | 2008 |
| Cantabile Touch Ltd | Arts & recreation | 2023 |
| Canterall Ltd | Professional & scientific | 2006 |