| Curedamp Limited | Construction | 2016 |
| Curiosity Cottage Ltd | Education | 2026 |
| Curran Software Engineering Ltd | Information & communication | 2023 |
| Curriculum and Quality Solutions Ltd | Education | 2015 |
| Cushen Nutrition Limited | Health & social care | 2015 |
| Cut-Tec Ltd | Extraterritorial | 2024 |
| Cutestghost Ltd | Wholesale & retail | 2024 |
| Cutie Pie's Cakery Ltd | Manufacturing | 2024 |
| Cutlass Construction Ltd | Construction | 2023 |
| Cutting Edge Transport Limited | Transport & logistics | 2011 |
| Cutting Technologies Limited | Manufacturing | 2002 |
| Cuttlehurst Properties Limited | Professional & scientific | 2006 |
| Cutts Trading Limited | Wholesale & retail | 2024 |
| CVD Powerlines Ltd | Construction | 2019 |
| CVH Van Rental Ltd | Administrative & support | 2012 |
| CVT Parts Limited | Wholesale & retail | 2016 |
| CW Property Consultants Ltd | Professional & scientific | 2018 |
| CWL Engineering Ltd | Construction | 2023 |
| CWT Ventures Ltd | Manufacturing | 2023 |
| CY CY Limited | Information & communication | 2024 |
| Cycling Sport Lifestyle Limited | Wholesale & retail | 2024 |
| Cynect Ltd | Information & communication | 2026 |
| Cziko Limited | Transport & logistics | 2025 |
| D & B Housing Limited | Real estate | 2021 |
| D & B Joinery & Maintenance Limited | Construction | 2025 |
| D & C Walker Limited | Wholesale & retail | 2004 |
| D & D Couriers (Barnsley) Ltd | Transport & logistics | 2015 |
| D & D Couriers Logistics (Barnsley) Ltd | Transport & logistics | 2016 |
| D & D Scaffold Services Ltd | Construction | 2023 |
| D & G Motors (Wath) Limited | Wholesale & retail | 2004 |
| D & I Home Improvements Ltd | Extraterritorial | 2014 |
| D & I Window Solutions Limited | Construction | 2009 |
| D & J Brittain Ltd | Construction | 2009 |
| D & K Surfacing Ltd | Construction | 2023 |
| D & K White Ltd | Other services | 2018 |
| D & L Trans Limited | Transport & logistics | 2018 |
| D & M Renewables Ltd | Construction | 2024 |
| D & N Property Developers Ltd | Real estate | 2025 |
| D & R Plumbing & Heating Contractors Limited | Construction | 2007 |
| D a L Fitt OUT Ltd | Construction | 2023 |
| D B Earthworks Ltd | Construction | 2022 |
| D B Industries (Yorkshire) Ltd | Professional & scientific | 2019 |
| D Birkinshaw Ltd | Wholesale & retail | 2024 |
| D Brant Transport Limited | Transport & logistics | 2014 |
| D G Installations Limited | Construction | 2018 |
| D H Plastering Solutions Ltd | Construction | 2024 |
| D Hall Properties Limited | Real estate | 2024 |
| D J Mechanical Ltd | Energy | 2025 |
| D J R Property Management Ltd | Households | 2005 |
| D J Watson Limited | Information & communication | 2013 |
| D K Fencing,Gardening & Landscaping Ltd | Administrative & support | 2025 |
| D Laughton Developments Ltd | Construction | 2016 |
| D Lazenby Building Services Limited | Construction | 2021 |
| D M Autocentre Limited | Other services | 2015 |
| D M Fibrous Limited | Administrative & support | 2017 |
| D Ogden Roofing Limited | Construction | 2023 |
| D P Abbott Stores Limited | Real estate | 2001 |
| D Pearson (Electrical) Limited | Construction | 1992 |
| D Pritchard Groundworks Limited | Construction | 2018 |
| D R Plastering South Yorkshire Ltd | Construction | 2021 |
| D Randle Plumbing & Heating Ltd | Construction | 2020 |
| D S Sozanski Transport Ltd | Transport & logistics | 2018 |
| D S Tyres Barnsley Ltd | Wholesale & retail | 2019 |
| D Sawtell Drivers Ltd | Transport & logistics | 2018 |
| D Sinclair Property Investments Ltd | Real estate | 2024 |
| D Smith Mortgages Limited | Financial services | 2019 |
| D W Hammond Electrical Ltd | Construction | 2021 |
| D&C Cranes Limited | Professional & scientific | 2012 |
| D&C Electrical Ltd | Administrative & support | 2024 |
| D&M Hospitality Limited | Hospitality | 2021 |
| D&R Darby Holdings Limited | Financial services | 2025 |
| D&W Property Collective Ltd | Real estate | 2024 |
| D'Lux Nails & Beauty Limited | Other services | 2022 |
| D-Grease (UK) Limited | Manufacturing | 2001 |
| D-Jeg Construction Services Limited | Construction | 2026 |
| D-Nawasari Ltd | Professional & scientific | 2020 |
| D-ZIGN2BLD Ltd | Professional & scientific | 2025 |
| D.A. Nicholson Limited | Agriculture & fishing | 2003 |
| D.A.R.K Strategies Ltd | Professional & scientific | 2026 |
| D.A.S Civils (Yorkshire) Ltd | Construction | 2022 |
| D.Arnold Plastering Limited | Construction | 2016 |
| D.C.U Services Ltd | Construction | 2024 |
| D.Darius Ltd | Construction | 2026 |
| D.H. Armitage Transport Limited | Wholesale & retail | 1972 |
| D.Koev Transport Limited | Transport & logistics | 2018 |
| D.M Electric (Dearne) Ltd. | Construction | 2018 |
| D.P.B. Excavations Limited | Construction | 2022 |
| D.R & Co. Electrical Ltd. | Construction | 2019 |
| D.W.Hughes (Barnsley) Limited | Other services | 1998 |
| D1GITISE Limited | Information & communication | 2020 |
| DA Costa Experts Ltd | Information & communication | 2026 |
| DA Properties (Yorkshire) Limited | Real estate | 2023 |
| Daciwolf Limited | Transport & logistics | 2024 |
| Dacoreit Ltd | Information & communication | 2024 |
| Dacws Limited | Construction | 2006 |
| Daddy Beanz Limited | Manufacturing | 2019 |
| Daddy's Signature Ltd | Hospitality | 2024 |
| Dade Bakery Limited | Manufacturing | 2022 |
| Daiciu Transport Limited | Transport & logistics | 2025 |
| Daisy Chain Nursery Mexborough Limited | Education | 2014 |