| Cortex Services Ltd | Construction | 2026 |
| Cosy Logs Limited | Extraterritorial | 2020 |
| Cotswold Country Estates Limited | Hospitality | 2020 |
| Country COW Investments Ltd | Hospitality | 2021 |
| County Mews Residents' Association Limited | Households | 1988 |
| Cowperthwaite Farm Limited | Wholesale & retail | 2020 |
| Cox-O'Shea Limited | Professional & scientific | 2011 |
| Cozi Vans Ltd | Manufacturing | 2024 |
| CP Medical Ltd | Professional & scientific | 2006 |
| Craftworks Installations Limited | Construction | 2025 |
| Cragg Enterprises Limited | Information & communication | 2001 |
| Cranworth & Co Developments Ltd | Administrative & support | 2025 |
| Craven Pictures Ltd | Administrative & support | 2014 |
| Craven Storage Limited | Transport & logistics | 2019 |
| Create Electrical Kendal Ltd | Construction | 2021 |
| Create Energy Ltd | Manufacturing | 2021 |
| Create Fire & Security Ltd | Administrative & support | 2021 |
| Create Solar UK Limited | Construction | 2018 |
| Creative Communities C.I.C. | Education | 2017 |
| Croft Foot Pods Limited | Hospitality | 2023 |
| Crook Fields Ltd | Hospitality | 2025 |
| Cropper (Trustees) Limited | Professional & scientific | 2017 |
| Crosby Granger Architects Ltd | Professional & scientific | 2014 |
| Crossbank Dental Care Ltd | Health & social care | 2010 |
| Crown Garage Group Limited | Wholesale & retail | 2019 |
| Crown Lane Apartments Limited | Households | 2005 |
| Crudo Fish Ltd | Hospitality | 2019 |
| CS Financial Group Limited | Financial services | 2017 |
| Cumbria Automotive Repair Service Limited | Wholesale & retail | 2012 |
| Cumbria Building Ltd | Construction | 2022 |
| Cumbria Caravan Services Ltd. | Wholesale & retail | 2006 |
| Cumbria Carpets Ltd | Wholesale & retail | 2024 |
| Cumbria Coaching Success Limited | Arts & recreation | 2016 |
| Cumbria Deaf Association | Health & social care | 2000 |
| Cumbria Fascias Limited | Construction | 2002 |
| Cumbria Furniture Limited | Financial services | 2017 |
| Cumbria GAS Limited | Construction | 2013 |
| Cumbria Landscaping Ltd | Administrative & support | 2022 |
| Cumbria Plant Hire Limited | Administrative & support | 2024 |
| Cumbria Procurement Services Limited | Professional & scientific | 2021 |
| Cumbria Speak Their Name Community Interest Company | Health & social care | 2024 |
| Cumbria Tourism | Other services | 1995 |
| Cumbria Tourist Board | Other services | 2006 |
| Cumbria Ultra Clean Civils Limited | Construction | 2017 |
| Cumbria Utilities Limited | Information & communication | 2019 |
| Cumbria Wildlife Trust Limited | Arts & recreation | 1962 |
| Cumbria Window Films Limited | Wholesale & retail | 2016 |
| Cumbria Window Systems Limited | Construction | 2000 |
| Cumbrian Property Investments Ltd | Real estate | 2022 |
| Cumbrian Riverside Limited | Hospitality | 2015 |
| Cumbriavag Limited | Arts & recreation | 2013 |
| Cunswick Limited | Households | 2019 |
| Curation Catering Ltd | Hospitality | 2023 |
| CWM Products Limited | Professional & scientific | 1995 |
| Cycle Sprog Ltd | Professional & scientific | 2012 |
| Cycle Touring Festival Limited | Arts & recreation | 2017 |
| D & J M Properties Limited | Construction | 2006 |
| D H Willacy & SON Limited | Construction | 1999 |
| D Logan Ltd | Construction | 2007 |
| D N Hunter Limited | Information & communication | 2021 |
| D Richardson & Sons (South Lakes) Limited | Construction | 2015 |
| D.H. Wilson Ltd. | Agriculture & fishing | 2002 |
| D.J. Glazing Limited | Construction | 1990 |
| D.M. Gould Wholesale Limited | Wholesale & retail | 2003 |
| D4 (Dodgson) Investment Limited | Real estate | 2008 |
| DAN Collison Ltd | Information & communication | 2014 |
| DAN Metcalfe Electrical Contractor Limited | Construction | 2015 |
| DAN Wilson Builds Limited | Construction | 2022 |
| Dan's Plants Ltd | Wholesale & retail | 2026 |
| Daniel Gray Hair & Beauty Team Kendal Limited | Other services | 2017 |
| Daniel Quiggin and SON Ltd | Manufacturing | 2011 |
| Darren Walsh Limited | Construction | 2003 |
| Dave Atkinson Contracting Limited | Administrative & support | 2024 |
| Dave Bainbridge Ltd | Real estate | 2025 |
| Davenport Original Ltd | Manufacturing | 2010 |
| David Birkett Holdings Limited | Administrative & support | 2017 |
| David Cliffe Automotive Ltd | Wholesale & retail | 2009 |
| David Hopkinson IFA Ltd | Financial services | 2010 |
| David M Brockbank LLP | | 2003 |
| Daviddon Limited | Transport & logistics | 2006 |
| Daylum Limited | Construction | 2006 |
| DB Outdoor Systems Limited | Real estate | 1986 |
| DBK Domus Limited | Real estate | 2024 |
| DBK Domus Properties Limited | Real estate | 2024 |
| DBK Kitchens Limited | Construction | 2022 |
| DC Joinery & Building Ltd | Construction | 2022 |
| DCS Joinery Limited | Construction | 2023 |
| Debbie Vayanos Design Limited | Professional & scientific | 2014 |
| DEL Hospitality Ltd | Hospitality | 2025 |
| Dendra Carpentry Ltd | Construction | 2026 |
| Derek Stafford Roofing Ltd | Construction | 2011 |
| DES Scanlan IT Recruitment Limited | Administrative & support | 2018 |
| Design Works (Cumbria) Limited | Professional & scientific | 2007 |
| Dewar's Inns Limited | Hospitality | 2013 |
| Dewolf Bushcraft CIC | Agriculture & fishing | 2021 |
| Dgtlonline Ltd | Information & communication | 2020 |
| Digital State Group Limited | Administrative & support | 2014 |
| Direct Scaffold NW Ltd | Construction | 2018 |
| Disability Discrimination Solutions Limited | Other services | 2004 |
| Display for Schools Limited | Wholesale & retail | 2009 |