| D E Gray Limited | Financial services | 2013 |
| D G Stubbs Limited | Construction | 2015 |
| D Gillespie Construction Limited | Construction | 2024 |
| D Holmes Plumbing & Heating Limited | Construction | 2016 |
| D Kerr Windows Ltd | Construction | 2023 |
| D Mcdonald Couriers Limited | Transport & logistics | 2019 |
| D Miller Tiling Ltd | Construction | 2022 |
| D Paisley Quality Butchers & Delicatessen Limited | Wholesale & retail | 2007 |
| D Prior Lighting Ltd | Professional & scientific | 2015 |
| D R Bowman (Properties) Limited | Real estate | 2003 |
| D R F Services Cumbria Limited | Wholesale & retail | 2014 |
| D S E Systems Limited | Construction | 2003 |
| D S Media Limited | Information & communication | 2005 |
| D S Norman (Timber) Limited | Transport & logistics | 2018 |
| D Stainton Joinery Limited | Construction | 2026 |
| D Watson Property Limited | Real estate | 2023 |
| D&G Electrical Services (North West) Limited | Construction | 2022 |
| D&G Ices Ltd | Wholesale & retail | 2019 |
| D&G Rentals Ltd | Administrative & support | 2019 |
| D&G Rockcliffe Ices Limited | Wholesale & retail | 2025 |
| D&G Seafoods Ltd | Hospitality | 2014 |
| D&S Smith Properties Ltd | Real estate | 2025 |
| D&W Homes Ltd | Real estate | 2025 |
| D'Urton Manor Management Company Limited | Construction | 2016 |
| D. D. Fabrications Limited | Manufacturing | 2006 |
| D.C Sawdoctoring Limited | Construction | 2012 |
| D.Foster & Sons Ltd | Hospitality | 2019 |
| D.W Building and Groundworks Ltd. | Construction | 2021 |
| DA Financial Services (Dalston) Limited | Financial services | 2000 |
| DA Human Mechanics Ltd | Health & social care | 2023 |
| DAB Properties Cumbria Ltd | Real estate | 2024 |
| Dacre Construction Limited | Construction | 2018 |
| DAD & Lad's Pizzeria Ltd | Hospitality | 2025 |
| DAG Railway Ltd | Construction | 2025 |
| DAILYBARGAINS17 Limited | Wholesale & retail | 2017 |
| Daisy Lane Carlisle Limited | Hospitality | 2025 |
| DAJ FIC Limited | Financial services | 2026 |
| Dale Delivery Limited | Wholesale & retail | 2024 |
| Dale Meadows Management Company Limited | Households | 2018 |
| Dalida Property Investments Limited | Real estate | 2025 |
| Dalore Ltd | Wholesale & retail | 2025 |
| Dalpha Construction Limited | Construction | 2020 |
| Dalston Leisure Limited | Hospitality | 2023 |
| Dalston Memorials Ltd | Other services | 2020 |
| Dalston MOT Centre Ltd | Wholesale & retail | 2023 |
| Dalston Pharmacy Limited | Wholesale & retail | 2005 |
| Dalston Road Properties Limited | Real estate | 2024 |
| Dalston Weir Ltd | Real estate | 2016 |
| Dalveen Ltd | Information & communication | 2014 |
| Damo's Repairs & Tech Ltd | Wholesale & retail | 2025 |
| Damola Haulage Ltd | Transport & logistics | 2019 |
| Damola Highlights and Beauty Services Limited | Other services | 2025 |
| DAN Gordon Promotions Limited | Information & communication | 2021 |
| Dance Ahead CIC | Education | 2025 |
| Dancepro Ltd | Arts & recreation | 2013 |
| Dandelion Coaching Community Interest Company | Education | 2021 |
| Daniel Boulter Limited | Construction | 2026 |
| Daniel&Son Trans Ltd | Transport & logistics | 2023 |
| Danielaa Ltd | Transport & logistics | 2025 |
| Danielle's Independant Consultancy & Regulation 44 Visits Ltd | Public administration | 2020 |
| Dantech Talent Ltd | Administrative & support | 2015 |
| Dantes Carlisle Ltd | Hospitality | 2023 |
| Dara 20 Ltd | Transport & logistics | 2023 |
| Dark Services Limited | Administrative & support | 2008 |
| Darkside Tanning Ltd | Other services | 2022 |
| Darren Weldon Ltd | Transport & logistics | 2026 |
| Data Taxies Limited | Extraterritorial | 2010 |
| Dave Kirkwood Studio Limited | Administrative & support | 2008 |
| Dave's Bathrooms Limited | Wholesale & retail | 2025 |
| David Allen Agribusiness Limited | Professional & scientific | 2012 |
| David Allen Agriculture Limited | Extraterritorial | 2014 |
| David Allen Employer Services Limited | Extraterritorial | 2010 |
| David Allen Financial Services (Dalston) Limited | Financial services | 2009 |
| David Allen Group Limited | Extraterritorial | 2015 |
| David Allen IT Limited | Information & communication | 2010 |
| David Allen Limited | Extraterritorial | 2000 |
| David Allen Recovery Solutions Limited | Extraterritorial | 2012 |
| David Baker Construction Limited | Construction | 2025 |
| David Blunt Groundworks Limited | Construction | 2012 |
| David Dunne Consulting Ltd | Real estate | 2017 |
| David G Collins Refrigeration Limited | Construction | 2001 |
| David Glendinning Ltd | Construction | 2025 |
| David Howard Sustainable Business Improvement Limited | Professional & scientific | 2022 |
| David Lloyd Contracts Consultants Limited | Professional & scientific | 2014 |
| David Malin Financial Advice Ltd | Financial services | 2024 |
| David Monkhouse Limited | Construction | 2003 |
| David Rothery Roofing Limited | Construction | 2015 |
| Davidnyams Ltd | Transport & logistics | 2025 |
| Davids Restaurant Limited | Hospitality | 2011 |
| Davidson Basement & Structural Waterproofing Specialists Ltd | Construction | 2025 |
| Davidsons Garage (Penrith) Limited | Wholesale & retail | 1974 |
| Davidsons Garage Holdings Limited | Financial services | 2018 |
| Dawn Stage Limited | Arts & recreation | 2018 |
| Dawn Till Dusk Roofing and Painting Ltd | Construction | 2025 |
| Dawson HR Limited | Professional & scientific | 2008 |
| Day Industries Ltd | Wholesale & retail | 2019 |
| Days Department Stores Limited | Wholesale & retail | 2017 |
| Daystar Cumbria Ltd | Financial services | 2024 |
| DB Body Repairs Limited | Wholesale & retail | 2025 |
| DB Build Cumbria Ltd | Construction | 2024 |