| Coastal Airports Limited | Transport & logistics | 2023 |
| Coastal Cars South Lakes Ltd | Transport & logistics | 2020 |
| Coastal Contracts and Airports Limited | Transport & logistics | 2022 |
| Coffee D'Ash Events Ltd | Professional & scientific | 2026 |
| Coffee D'Ash Ltd | Hospitality | 2023 |
| Colin Tucker Electrics Ltd | Construction | 2018 |
| Collaborative Homes Limited | Real estate | 2024 |
| Community Energy Management Co. Ltd | Other services | 1994 |
| Concrete Services Limited | Administrative & support | 2002 |
| Connect Flow Media Ltd | Professional & scientific | 2024 |
| Conservatory Show Sites Limited | Professional & scientific | 2011 |
| Contemporary Consultancy Ltd | Professional & scientific | 2022 |
| Contour Enterprises Limited | Professional & scientific | 1999 |
| Coopers Healthcare Ltd | Health & social care | 2025 |
| Cornerstone Commercial (NW) Ltd | Real estate | 2024 |
| Cornerstone Greenbank Commercial Limited | Real estate | 2020 |
| Cornerstone Greenbank Holdings Limited | Financial services | 2025 |
| Cornerstone Greenbank Ltd | Construction | 2015 |
| Cornerstone Greenbank Properties Limited | Real estate | 2024 |
| Cornerstone Group (NW) Ltd | Construction | 2024 |
| Cornerstone Holdings (NW) Ltd | Financial services | 2024 |
| Cornerstone Properties (NW) Ltd | Real estate | 2024 |
| Cornerstone Support (NW) CIC | Health & social care | 2026 |
| Craig Mccowen Ltd | Construction | 2015 |
| Creative Paving Limited | Construction | 2010 |
| Creative Production Solutions Limited | Other services | 2024 |
| Creative Studios Cumbria Limited | Arts & recreation | 2007 |
| Crellin ST Launderette Limited | Other services | 2020 |
| Croft Care Trust | Health & social care | 1990 |
| Croft Factory Ltd | Wholesale & retail | 2024 |
| Crofters (UK) Ltd | Hospitality | 2011 |
| Crofters Lodge Ltd | Hospitality | 2025 |
| Cromptopia Estates Limited | Real estate | 2026 |
| Crowe Joinery Limited | Construction | 2002 |
| CS Body Composition Coaching Ltd | Arts & recreation | 2026 |
| CS Vehicles & Transport Ltd | Wholesale & retail | 2025 |
| CSS Travel Ltd | Administrative & support | 2019 |
| CST Planning Ltd | Administrative & support | 2007 |
| Cumberland & Westmorland Transport Ltd | Transport & logistics | 2012 |
| Cumbria Brick & Stone Pointing & Restoration Services Ltd | Construction | 2024 |
| Cumbria Civil Engineering Limited | Construction | 2019 |
| Cumbria Cleaning Limited | Administrative & support | 2025 |
| Cumbria Community Person Centred Approach Limited | Health & social care | 2021 |
| Cumbria Construction Group Ltd | Real estate | 2024 |
| Cumbria Embroidery & Print Ltd | Wholesale & retail | 2005 |
| Cumbria Engineering Consultancy Ltd | Professional & scientific | 2022 |
| Cumbria Plumbing and Heating Ltd | Administrative & support | 2016 |
| Cumbria Properties Ltd | Construction | 2023 |
| Cumbria Sewing & Craft Centre Ltd | Wholesale & retail | 2004 |
| Cumbria Stitch & Print Limited | Wholesale & retail | 2025 |
| Cumbria Supermarket Ltd | Wholesale & retail | 2021 |
| Cumbrian Getaways Ltd | Real estate | 2019 |
| Cumbrian Property Solutions Ltd | Real estate | 2024 |
| Cumbriatechlab Ltd | Other services | 2025 |
| Curry Leaf Takeaway Ltd | Hospitality | 2022 |
| Currylovers Limited | Hospitality | 2025 |
| Custard Kebab Ltd | Manufacturing | 2026 |
| Custom Accounts Limited | Administrative & support | 2019 |
| Custom House Development (NW) Ltd | Construction | 2024 |
| Cute Pups Club Ltd | Wholesale & retail | 2024 |
| Cutronas FS Limited | Financial services | 2012 |
| CW Film Productions Ltd | Information & communication | 2020 |
| CW Property Solutions Ltd | Real estate | 2018 |
| D & a Property Estates Ltd | Real estate | 2023 |
| D & a Property Management Ltd | Real estate | 2019 |
| D & H Developments (Barrow) Ltd | Construction | 2019 |
| D & J Mossop Limited | Administrative & support | 2012 |
| D Bower Fabrications Ltd | Manufacturing | 2019 |
| D Brock Engineering Ltd | Other services | 2022 |
| D J Fenton Building Services Limited | Construction | 2016 |
| D M Carpet Fitters & Upholsterers Limited | Construction | 2022 |
| D Sneesby Mech Ltd | Professional & scientific | 2022 |
| Dacite Limited | Professional & scientific | 2011 |
| Daddy's Family Bakery Ltd | Hospitality | 2018 |
| Daily Cargo Limited | Wholesale & retail | 2016 |
| Dale Cleece Render and Damp Control Ltd | Construction | 2024 |
| Dalmore Court Management Company | Households | 1988 |
| Dalton 4X4 Offroad Lakes Adventures Ltd | Arts & recreation | 2025 |
| Dalton Tool Hire (BCJ) Limited | Administrative & support | 2005 |
| DAM Commissioning Limited | Other services | 2024 |
| Damptec.Com Limited | Construction | 2010 |
| Danny Phillipson Limited | Transport & logistics | 2019 |
| Dapper by Marsha LEA Ltd | Wholesale & retail | 2018 |
| Dark AS Day Apparel Limited | Wholesale & retail | 2020 |
| Darlington Eats Ltd | Hospitality | 2020 |
| Darren Brough Services Limited | Construction | 2021 |
| Darren Byrne Plastering Limited | Construction | 2008 |
| DAT Offshore Limited | Construction | 2018 |
| Datler Developments Limited | Administrative & support | 2021 |
| Dave New Coach Travel Limited | Transport & logistics | 2008 |
| Dave New Tours Limited | Transport & logistics | 2002 |
| David Armstrong Ltd | Financial services | 2006 |
| David Clark and Associates Ltd | Administrative & support | 2025 |
| David Clifton Plastering and Roofing Limited | Construction | 2024 |
| David Huitson Limited | Professional & scientific | 2008 |
| David Mccarter Limited | Administrative & support | 2015 |
| David Muncaster Limited | Construction | 2006 |
| David Sanderson Digital Limited | Professional & scientific | 2014 |
| Davidoropetech Ltd | Construction | 2026 |
| Dawson Court Management Ltd | Households | 2012 |