| CP Services (Borders) Limited | Water & waste | 2021 |
| CPM Joinery & Building Limited | Construction | 2011 |
| CPM Property Development Limited | Construction | 2023 |
| Cpsl Ltd | Professional & scientific | 2015 |
| CR Process OP Technician Limited | Administrative & support | 2017 |
| Crabtree Haulage Limited | Transport & logistics | 2016 |
| Craft Hair & Beauty Limited | Other services | 2014 |
| Craftcentre Cymru (Manufacturing) Cyfyngedig | Professional & scientific | 1959 |
| Craftcentre Cymru Cyfyngedig | Professional & scientific | 1965 |
| Craftcentre Cymru Group Cyfyngedig | Professional & scientific | 1974 |
| Craig Kennedy Limited | Wholesale & retail | 2014 |
| Craig Robinson Vets Limited | Professional & scientific | 2003 |
| Craig's Supps Ltd | Education | 2025 |
| Crawford Johnson Ltd | Real estate | 2006 |
| Creating Leads Limited | Professional & scientific | 2014 |
| Creative Gardens Limited | Construction | 2007 |
| Creca Belty Farming Company | Administrative & support | 2012 |
| Credit Expert Ltd | Financial services | 2015 |
| Creighton Rugby Union Football Club Limited | Arts & recreation | 2016 |
| Creme Cafe Cycles Ltd | Wholesale & retail | 2023 |
| Creo Content Ltd | Professional & scientific | 2024 |
| Crewford Holdings Limited | Wholesale & retail | 2022 |
| Crfm CIC | Information & communication | 2019 |
| Criffel Care Services Ltd | Health & social care | 2023 |
| Criffel Homes Ltd | Real estate | 2024 |
| Criffel Investments Limited | Health & social care | 2010 |
| Crindledyke Farm (Carlisle) Flat Management Company Limited | Households | 2016 |
| Crindledyke Farm (Carlisle) Management Company Limited | Households | 2013 |
| Croft Engineering (Cumbria) Limited | Professional & scientific | 2001 |
| Croftlands Close Management Company Limited | Households | 2023 |
| Crofton Caravan & Leisure Storage Limited | Transport & logistics | 2005 |
| Crosby Grange Property Management Company Limited | Households | 2003 |
| Crosby on Eden Church of England Primary School | Education | 2012 |
| Cross Limited | Agriculture & fishing | 2025 |
| Crosskit Limited | Information & communication | 2012 |
| Crow Park Limited | Hospitality | 2004 |
| Crown Cabling Systems Limited | Construction | 2005 |
| Crown Fire & Security (Cumbria) Limited | Construction | 2021 |
| Crown Lane Cellar Ltd | Hospitality | 2025 |
| Crown Packaging Distribution UK Limited | Administrative & support | 2016 |
| Crown Packaging Manufacturing UK Limited | Manufacturing | 2016 |
| Crown Packaging UK Limited | Manufacturing | 1921 |
| Crown Woodworks Ltd | Manufacturing | 2021 |
| Crynfryn Bychan Limited | Agriculture & fishing | 2018 |
| Crystal Driver Training Limited | Education | 2014 |
| CS Blinds & Shutters Carlisle Limited | Other services | 2015 |
| CSG Healthcare UK Ltd | Health & social care | 2017 |
| CSL Property (Cumbria) Ltd | Real estate | 2024 |
| Csvproperties Limited | Real estate | 2024 |
| CSW Insurance Brokers Limited | Financial services | 2002 |
| CT Precision Limited | Construction | 2022 |
| CT Repairs Limited | Wholesale & retail | 2013 |
| CTM Carlisle Limited | Construction | 2005 |
| CTM Group Limited | Transport & logistics | 2002 |
| Cubby Construction Limited | Construction | 1991 |
| Cubby Group Limited | Financial services | 2025 |
| Cubby Plant Limited | Financial services | 2025 |
| Cubby's Signs Limited | Administrative & support | 2004 |
| Cubic CS Ltd | Professional & scientific | 2010 |
| Cuedoc Limited | Health & social care | 2008 |
| Culture & Clarity Limited | Administrative & support | 2025 |
| Cumberland and Westmorland Wrestling Association Limited | Arts & recreation | 2004 |
| Cumberland Breweries (Great Corby) Ltd | Manufacturing | 2016 |
| Cumberland Holdings Limited | Financial services | 1989 |
| Cumberland Properties Ltd | Real estate | 2025 |
| Cumberland Radio Ltd | Information & communication | 2023 |
| Cumberland Sporting Car Club Limited | Arts & recreation | 1981 |
| Cumberland Taxis Limited | Transport & logistics | 2022 |
| Cumbria (Joinery & Fencing) Limited | Agriculture & fishing | 1984 |
| Cumbria 24/7 Limited | Health & social care | 2008 |
| Cumbria Addictions Advice and Solutions | Health & social care | 1991 |
| Cumbria Agricultural Construction Ltd | Construction | 2022 |
| Cumbria ALE and Food House Limited | Hospitality | 2018 |
| Cumbria Assessment and Diagnostic Service Limited | Professional & scientific | 2023 |
| Cumbria Asset Managers Ltd | Real estate | 2009 |
| Cumbria Attire Ltd | Wholesale & retail | 2025 |
| Cumbria Bailiffs Limited | Administrative & support | 2016 |
| Cumbria BIN Fresh Ltd | Administrative & support | 2018 |
| Cumbria Blinds (NW) Ltd. | Arts & recreation | 2020 |
| Cumbria Building Supplies Holdings Ltd | Wholesale & retail | 2019 |
| Cumbria Building Supplies Limited | Wholesale & retail | 2000 |
| Cumbria Car Sales Ltd | Wholesale & retail | 2026 |
| Cumbria Care Recruitment Limited | Administrative & support | 2026 |
| Cumbria Chamber of Commerce and Industry | Other services | 2001 |
| Cumbria Clil Ltd | Education | 2013 |
| Cumbria Clinical Training Limited | Education | 2025 |
| Cumbria Coaches Limited | Transport & logistics | 1991 |
| Cumbria Collective Ltd | Professional & scientific | 2026 |
| Cumbria Commercial Vehicles Limited | Wholesale & retail | 2014 |
| Cumbria Council for Voluntary Service | Information & communication | 2007 |
| Cumbria County Holdings Limited | Financial services | 2012 |
| Cumbria Credits | Education | 2002 |
| Cumbria CVS Trading Limited | Financial services | 2013 |
| Cumbria Developments Limited | Real estate | 2015 |
| Cumbria Distilling Co. Limited | Manufacturing | 2018 |
| Cumbria Electroplating Ltd | Manufacturing | 2025 |
| Cumbria Energy Surveys Ltd | Professional & scientific | 2025 |
| Cumbria Express Limited | Transport & logistics | 2026 |
| Cumbria Facilities Management Limited | Households | 2022 |
| Cumbria Family Business Forum Limited | Professional & scientific | 2013 |