| CSG Enterprises Ltd | Wholesale & retail | 2023 |
| Cskk Ltd | Transport & logistics | 2021 |
| CSM Plastering Ltd | Construction | 2016 |
| CSW Property Limited | Wholesale & retail | 2010 |
| CT Interim UK Two LP | | 2004 |
| CTR Motor Company Ltd | Wholesale & retail | 2021 |
| CTS Bridges Limited | Construction | 1988 |
| CTS BUS Limited | Transport & logistics | 2009 |
| CTS UK PVT Ltd | Wholesale & retail | 2026 |
| CTW Surfacing UK Ltd | Construction | 2017 |
| Cubic Expression (UK) Ltd | Real estate | 2005 |
| Cubicn Limited | Information & communication | 2022 |
| Cubit Precision Measurement Limited | Manufacturing | 2020 |
| Cubo Moto Limited | Wholesale & retail | 2013 |
| Cucina Romana Limited | Hospitality | 2024 |
| Cuckoo Care Ltd | Health & social care | 2020 |
| Cuckoo Commercial Properties Limited | Real estate | 2019 |
| Cuckoo Nest Properties Limited | Real estate | 2007 |
| Cuckoo Properties Limited | Real estate | 2013 |
| Cuckoos by the Beach Ltd | Hospitality | 2022 |
| Cuckoos Coffee Company Ltd | Hospitality | 2018 |
| Cullen Jointing Limited | Information & communication | 2014 |
| Cultivate Courage Ltd | Administrative & support | 2025 |
| Culture Co (Meanwood) Limited | Wholesale & retail | 2022 |
| Culture Co (Slawit) Limited | Wholesale & retail | 2022 |
| Culture Co Holdings Limited | Wholesale & retail | 2022 |
| Cumberworth Building Products Ltd | Wholesale & retail | 2016 |
| Cumberworth Development Ltd | Construction | 2014 |
| Cumberworth Properties Limited | Real estate | 2026 |
| Cumbria Storage Systems Limited | Extraterritorial | 1991 |
| Cumin Court (Management) Limited | Real estate | 2003 |
| Cummings Health Limited | Health & social care | 2025 |
| Cumulus Access Limited | Professional & scientific | 2013 |
| Cupids Carpets Cleaning Service Ltd | Administrative & support | 2021 |
| Cuppa Chaii (Whitechapel) Ltd | Hospitality | 2024 |
| Cure Adhd Ltd | Professional & scientific | 2024 |
| Curis Limited | Health & social care | 2021 |
| Curleys Installations Ltd | Manufacturing | 2022 |
| Curvature Business Services Limited | Professional & scientific | 2012 |
| CUT J Productions Ltd | Information & communication | 2024 |
| Cutandpress Limited | Wholesale & retail | 2017 |
| Cute 'N' Cuddly Ltd | Wholesale & retail | 2025 |
| Cutting Edge Knives Limited | Wholesale & retail | 2013 |
| Cuvama Limited | Information & communication | 2017 |
| Cvbp Ltd | Real estate | 2023 |
| CVC Holdings Ltd | Real estate | 2024 |
| CW Building Ltd | Construction | 2026 |
| CWD Franchise Ltd | Extraterritorial | 2014 |
| CWG Estates Ltd | Real estate | 2016 |
| CWH Services Ltd | Construction | 2025 |
| Cwoodconstruction Ltd | Construction | 2026 |
| CWS (West Yorkshire) Limited | Construction | 2005 |
| CX Journey Consulting Ltd | Professional & scientific | 2025 |
| CX Technology Limited | Information & communication | 2022 |
| CX22TECH Limited | Information & communication | 2024 |
| CXY Limited | Information & communication | 2018 |
| Cyber Souq Ltd | Wholesale & retail | 2022 |
| Cyber Tech Ltd | Other services | 2015 |
| Cyber Transformation Limited | Professional & scientific | 2022 |
| Cyberrealityx Ltd | Information & communication | 2024 |
| Cycle Works Yorkshire Limited | Wholesale & retail | 2018 |
| CYP Psychology Ltd | Professional & scientific | 2025 |
| D & L Services Hudds Limited | Construction | 2021 |
| D & a Hill Limited | Extraterritorial | 1999 |
| D & a Plastering Services Ltd | Construction | 2020 |
| D & D (Ossett) Holdings Limited | Financial services | 2026 |
| D & D Graphic Engineers Limited | Manufacturing | 1990 |
| D & J'S Wholesale Foods Ltd | Wholesale & retail | 2025 |
| D & M Bates Limited | Health & social care | 2024 |
| D & S Recruitment Consultancy Limited | Administrative & support | 2021 |
| D & T Electrical Contractors Ltd | Construction | 2020 |
| D a Properties (Hudds) Ltd | Real estate | 2022 |
| D a Recordings Limited | Information & communication | 2009 |
| D Boothroyd & Sons Ltd | Construction | 2018 |
| D Carson Limited | Other services | 2023 |
| D Foreman Electrical Solutions Ltd | Construction | 2020 |
| D G Stanley & Sons Joiners & Building Contractors Limited | Construction | 2003 |
| D House Limited | Manufacturing | 2023 |
| D J Edington Limited | Construction | 2010 |
| D J Hirst & SON Limited | Construction | 2012 |
| D Johal Investments Ltd | Real estate | 2021 |
| D L Hire Ltd | Transport & logistics | 2025 |
| D Lockwood Wrought Iron Ltd | Manufacturing | 2016 |
| D M Brewster Groundworks & Excavations Ltd | Construction | 2005 |
| D M Textile Machinery Limited | Manufacturing | 2006 |
| D Moorhouse Limited | Administrative & support | 2016 |
| D N S Discounts Ltd | Wholesale & retail | 2003 |
| D Ofada Signature Ltd | Hospitality | 2025 |
| D P B Driver Services Ltd | Transport & logistics | 2015 |
| D R Beaumont Electrical Ltd | Construction | 2017 |
| D R Binns Butchery Limited | Wholesale & retail | 2025 |
| D Scott Pattern Makers (2007) Ltd. | Manufacturing | 2007 |
| D W Brook & SON Ltd | Agriculture & fishing | 2006 |
| D W Tree Services Limited | Agriculture & fishing | 2004 |
| D&G Construction & Groundworks Ltd | Construction | 2021 |
| D&G Office Services Ltd | Manufacturing | 2017 |
| D&K Pallets Limited | Manufacturing | 2012 |
| D&N.Ro Ltd | Hospitality | 2025 |
| D'Arcy Howard Castleford Limited | Professional & scientific | 2002 |
| D-Star Bars Limited | Hospitality | 2019 |