| CLO Property Investments BTL Limited | Real estate | 2022 |
| CLO Property Investments Ltd | Real estate | 2021 |
| CLO Property Solutions Ltd | Real estate | 2020 |
| Cloud Atlas Vaping Ltd | Wholesale & retail | 2013 |
| Cloud Atlas Wholesale Ltd | Manufacturing | 2016 |
| CMO Support Services Limited | Administrative & support | 2025 |
| CNU Logistics Ltd | Transport & logistics | 2022 |
| Coffee Revolution Ltd | Hospitality | 2025 |
| Cohen Fabrications Ltd | Manufacturing | 2025 |
| Coleman Crystal Clear Windows Limited | Administrative & support | 2023 |
| Commercial Glass Systems Limited | Manufacturing | 2023 |
| Commercial Interiors Direct Limited | Manufacturing | 2025 |
| Community Cabin Foundation CIC | Hospitality | 2019 |
| Community Energy Partnerships (UK) Limited | Energy | 2018 |
| Compass Martial Arts Goole Ltd | Arts & recreation | 2025 |
| Complete UK AI Group Limited | Information & communication | 2025 |
| Conblock Ltd | Arts & recreation | 2023 |
| Concorde Yachting Ltd | Manufacturing | 2025 |
| Connection Ring Ltd | Transport & logistics | 2025 |
| Container Coffee & Donuts Holdings Limited | Financial services | 2012 |
| Container Coffee & Donuts Limited | Hospitality | 2019 |
| Convenience Stores UK (Castleford) Ltd | Wholesale & retail | 2020 |
| Copper Top Coffee Ltd | Extraterritorial | 2021 |
| Corbett's Plumbing and Heating Ltd | Construction | 2018 |
| Cordus Law Limited | Professional & scientific | 2021 |
| Corecarttrading Ltd | Wholesale & retail | 2025 |
| Coremeum Software Limited | Information & communication | 2019 |
| Cornwall Energy Partnerships Limited | Professional & scientific | 2020 |
| Cowell Homes Limited | Extraterritorial | 1999 |
| CP Consultancy (Yorkshire) Ltd. | Professional & scientific | 2021 |
| CPF Building Solutions Limited | Construction | 2026 |
| Cpms Commercial Plumbing and Maintenance Services Limited | Construction | 2016 |
| Crabbe Transport Limited | Transport & logistics | 2017 |
| Craigseansasha Limited | Health & social care | 2018 |
| Cranberry Solutions Ltd | Other services | 2023 |
| Crash Drum School Limited | Education | 2014 |
| Crazy Price Beds Ltd | Wholesale & retail | 2022 |
| Creative Confluence CIC | Arts & recreation | 2026 |
| Creative Turning Point Ltd | Professional & scientific | 2017 |
| Crissy's Healthcare Ltd | Administrative & support | 2017 |
| Cromack Property Management Limited | Real estate | 2025 |
| Crown Pizza (Castleford) Ltd | Administrative & support | 2016 |
| Crownmere Property Group Ltd | Real estate | 2026 |
| CS Auto Electrical Parts UK Limited | Wholesale & retail | 2013 |
| CS Auto Electrics (Castleford) Limited | Wholesale & retail | 2013 |
| CS Event Catering Limited | Hospitality | 2022 |
| CSB at the Houghton Ltd | Hospitality | 2020 |
| CSD Print Limited | Manufacturing | 2008 |
| CSL Plumbing and Heating Limited | Mining & quarrying | 2025 |
| Cumbria Energy Partnerships Limited | Professional & scientific | 2020 |
| CUP of the Day Ltd | Wholesale & retail | 2026 |
| Cussons International Ltd | Transport & logistics | 2015 |
| Custompac Holdings Limited | Professional & scientific | 2001 |
| Custompac Limited | Manufacturing | 1976 |
| CV Power Ltd | Construction | 2023 |
| Cyber Dine Ltd | Hospitality | 2025 |
| Cykel House Ltd | Wholesale & retail | 2018 |
| Cyrus Recruitment Ltd | Administrative & support | 2023 |
| Cyrus Transport & Removal Ltd | Transport & logistics | 2023 |
| D & M Housing Limited | Real estate | 2017 |
| D and S Hospitality Ltd | Hospitality | 2026 |
| D B Management Consultancy Ltd | Extraterritorial | 2016 |
| D J Byers Security Solutions Limited | Administrative & support | 1983 |
| D J Riley Environmental Consultants Ltd | Professional & scientific | 2014 |
| D Noble Holding Castleford Limited | Financial services | 2020 |
| D&D Developments Ltd | Construction | 2016 |
| D&M Foods Ltd | Hospitality | 2020 |
| D&N Convenience Store Ltd | Wholesale & retail | 2021 |
| D. Noble Limited | Construction | 1966 |
| D. Sabou Building Services Ltd | Professional & scientific | 2007 |
| DA Gates Fencing and Maintenance Limited | Construction | 2025 |
| Daiola Ltd | Manufacturing | 2024 |
| Daniel Aaron Limited | Manufacturing | 2009 |
| Daniels Investments Group Ltd | Construction | 2023 |
| Dara Trading Limited | Wholesale & retail | 2019 |
| Darkgoldenrod Ltd | Transport & logistics | 2018 |
| Datatech IT Consultants Limited | Information & communication | 2017 |
| David Winter Tailoring Ltd | Manufacturing | 2020 |
| Day 2 Day Motors Ltd | Wholesale & retail | 2021 |
| DBC Plant Services Ltd | Manufacturing | 2018 |
| DC Transport (Yorkshire) Limited | Transport & logistics | 2012 |
| DCM Incorporation Ltd | Construction | 2020 |
| Dcsourced Ltd | Wholesale & retail | 2024 |
| DDW Air Conditioning Ltd | Construction | 2025 |
| DE Noble Ltd | Arts & recreation | 2014 |
| Dearlove Research & Consulting Ltd | Professional & scientific | 2025 |
| Decor Sisters Ltd | Arts & recreation | 2025 |
| Deli 65 Limited | Hospitality | 2026 |
| Delvemade Limited | Extraterritorial | 1991 |
| Demarch Ltd | Wholesale & retail | 2024 |
| Demma Estates Ltd | Construction | 2023 |
| Derbyshire Energy Partnerships Limited | Professional & scientific | 2020 |
| Design by SB Limited | Wholesale & retail | 2019 |
| DEX8 Ltd | Real estate | 2026 |
| Dezired Properties Ltd | Real estate | 2019 |
| Dhruv Ltd | Wholesale & retail | 2026 |
| Diamond Scaffolding Services Yorkshire Ltd | Construction | 2017 |
| Diamond Solution Security Ltd | Financial services | 2022 |
| Diamonds Edge Group Ltd | Administrative & support | 2025 |
| Diamos Law Limited | Professional & scientific | 2025 |