| Brathay Investments Limited | Financial services | 2021 |
| Brathay Properties Limited | Real estate | 2015 |
| Brian & My Nicholson Garden Maintenance Ltd | Construction | 2015 |
| Brian Metcalfe Welding Ltd | Manufacturing | 2026 |
| Brightmere Properties Ltd | Real estate | 2021 |
| Britalia (Kendal) Ltd | Hospitality | 2024 |
| Britalia (Lancaster) Limited | Hospitality | 2024 |
| Britalia (Sale) Ltd | Hospitality | 2026 |
| Broad Leys (Windermere) Limited | Real estate | 2017 |
| Brown Horse Winster 2018 Limited | Hospitality | 2018 |
| Brownell Developments Limited | Construction | 2015 |
| Brunch in Windermere Limited | Hospitality | 2025 |
| BUG 'a' OFF Ltd | Wholesale & retail | 2026 |
| Buildscape Lakes Ltd | Construction | 2025 |
| Built to Send Ltd | Manufacturing | 2022 |
| Burnett Design Ltd | Information & communication | 2018 |
| Butler Procter Ltd | Professional & scientific | 2019 |
| C Smith Properties Limited | Real estate | 2021 |
| C. Greenall Joinery & Building Contractor Limited | Construction | 2012 |
| C.J. Bradley Developments Limited | Construction | 2003 |
| CAL Hospitality Limited | Hospitality | 2025 |
| Calgarth Cottages Management Company Limited | Administrative & support | 2014 |
| Calma Nation Ltd | Information & communication | 2026 |
| Carbon Well Ltd | Professional & scientific | 2023 |
| Cark House Management Company Limited | Households | 2004 |
| Castle Meadows Management Company Limited | Households | 1997 |
| Cato Road Ltd | Wholesale & retail | 2023 |
| Caulfield Associates Ltd | Professional & scientific | 2013 |
| Caxton House (Windermere) Limited | Households | 1999 |
| Cedar Manor Hotel Ltd | Hospitality | 2007 |
| CGM Law LLP | | 2011 |
| Chadwick and Partners Ltd | Professional & scientific | 2022 |
| Chalmers Parkinson Limited | Real estate | 2025 |
| Chapel Court Management Company (Troutbeck Bridge) Limited | Real estate | 1996 |
| Chapel Ridding Apartments Limited | Households | 2000 |
| Chapel Ridding Management Company Limited | Households | 1999 |
| Charhar Limited | Hospitality | 2014 |
| Charney Road Management Company Limited | Households | 2004 |
| Chester Christmas Market Ltd | Wholesale & retail | 2021 |
| Chilled OUT Ltd | Administrative & support | 2016 |
| Chrimar Ltd | Professional & scientific | 2024 |
| Chris Jackson Ltd | Construction | 2002 |
| Cigi Technology Limited | Professional & scientific | 1990 |
| Cinque Ltd | Real estate | 2024 |
| Circuit PA Limited | Arts & recreation | 2018 |
| Cjnj Limited | Real estate | 2019 |
| Clam (Christmas Lane and Meadowcroft) Ltd | Households | 2017 |
| Claspcell Limited | Hospitality | 1978 |
| Clear View Learning Ltd | Other services | 2015 |
| Clearspin Ltd | Other services | 2019 |
| CM Property Refurbishment Ltd | Construction | 2018 |
| Columbia Sportswear Company Limited | Wholesale & retail | 1999 |
| Commune Events Ltd | Arts & recreation | 2023 |
| Company Strategy Limited | Professional & scientific | 2024 |
| Complete Solutions (North West) Limited | Construction | 2000 |
| Country Lanes Cycle Centre Ltd | Administrative & support | 2011 |
| Craig Walk Management Company Limited | Professional & scientific | 1973 |
| Craig Walk Properties Limited | Hospitality | 2021 |
| Crofter Developments Limited | Professional & scientific | 1998 |
| Crown Rigg Management Company Limited | Households | 1999 |
| CRUMB46 Ltd | Hospitality | 2024 |
| CUI International Limited | Manufacturing | 1986 |
| Cumbria Fireplaces Ltd | Wholesale & retail | 2007 |
| Cumbria Holiday LET Services Ltd | Administrative & support | 2025 |
| Cumbria Life Ltd | Real estate | 2023 |
| Cumbrian Artisan Bakery Ltd | Manufacturing | 2023 |
| Cumbrian Craftsmanship Limited | Manufacturing | 2010 |
| Cunswick Scar Ltd | Hospitality | 2024 |
| Cxgoods Ltd | Wholesale & retail | 2025 |
| DA Joinery (Windermere) Limited | Construction | 2013 |
| Darren Woolcock Stonewalling Limited | Construction | 2007 |
| David Loffelmann Electrical Ltd | Construction | 2014 |
| Dean Taylor Bathrooms Ltd | Construction | 2017 |
| Deltamove Limited | Real estate | 2015 |
| Denecrest Ltd | Hospitality | 2025 |
| Denewood (Windermere) Management Limited | Administrative & support | 2016 |
| Denholm Davidson Ltd | Information & communication | 2014 |
| Design Real Limited | Professional & scientific | 2013 |
| DJB Property North West Ltd | Real estate | 2024 |
| DKS Corporation Limited | Information & communication | 2022 |
| DM Tiling (Cumbria) Ltd | Construction | 2026 |
| DNB Electrical Contractors Ltd | Administrative & support | 2014 |
| DNB Property Ltd | Real estate | 2021 |
| Dodl Ltd | Information & communication | 2015 |
| Dora and ROB Cleaning Services Ltd | Administrative & support | 2022 |
| Douglas Hughes Ltd | Real estate | 2024 |
| Down Under Connect Ltd | Administrative & support | 2025 |
| DR Colin Read Medicolegal Services Ltd | Health & social care | 2011 |
| Draper Production Ltd | Information & communication | 2025 |
| Drive & Coupling Solutions Ltd | Professional & scientific | 2010 |
| Drury Projects Ltd | Education | 2022 |
| Dsed Unlimited | Administrative & support | 2018 |
| Duddon Electronics Limited | Professional & scientific | 1978 |
| Dutton Cuisine Limited | Hospitality | 1997 |
| E J Jordan Limited | Information & communication | 2016 |
| Education and Psychology Services Limited | Education | 2011 |
| Education Business Management Limited | Professional & scientific | 2015 |
| Eight Acres Limited | Real estate | 2023 |
| Eileen's Meadow Limited | Real estate | 2026 |
| Elleray Electrical Ltd | Construction | 2017 |