| Clipside Ltd | Other services | 2025 |
| Cloud Lettings & Property Management Ltd | Real estate | 2022 |
| Cloudling Ltd | Wholesale & retail | 2026 |
| CMR Lets Limited | Real estate | 2018 |
| CMR Supplies Ltd | Wholesale & retail | 2023 |
| Coco Cravings Limited | Hospitality | 2025 |
| Coffeeboy Franchises Ltd | Hospitality | 2023 |
| Coffeeboy Holdings Limited | Financial services | 2023 |
| Coffeeboy Retail Ltd | Hospitality | 2023 |
| Colne Valley Dogs Ltd | Education | 2025 |
| Combat Rehab Ltd | Arts & recreation | 2025 |
| Combined Reinforcements Limited | | 1986 |
| Comfort Dreams Ltd | Manufacturing | 2018 |
| Comfort Sleep (INT) Limited | Manufacturing | 2019 |
| Comfy Craft Ltd | Manufacturing | 2015 |
| Comfy Matts Ltd | Manufacturing | 2025 |
| Comfy Nights Limited | Manufacturing | 2015 |
| Comfytimez Ltd | Manufacturing | 2026 |
| Comfyy Beds & Sofa Ltd | Wholesale & retail | 2023 |
| Commercial Lease Management Ltd | Real estate | 2018 |
| Community Training Specialist Ltd | Education | 2025 |
| Company 19 Ltd | Wholesale & retail | 2024 |
| Concept OFF Site Solutions Limited | Wholesale & retail | 2006 |
| Conceptbeds Limited | Manufacturing | 2018 |
| Connect Components Ltd | Wholesale & retail | 2024 |
| Connectix Consultant Ltd | Administrative & support | 2025 |
| Connor Hall Fitness Limited | Arts & recreation | 2026 |
| Constantia at Home Limited | Health & social care | 2025 |
| Constantia Care Developments Limited | Extraterritorial | 2014 |
| Constantia Care Homes Limited | Extraterritorial | 2014 |
| Constantia CH Limited | Health & social care | 2021 |
| Constantia Healthcare (Roseleigh) Limited | Health & social care | 2010 |
| Constantia Healthcare Group Limited | Professional & scientific | 2014 |
| Constantia Healthcare Investments (NO 2) Limited | Professional & scientific | 2023 |
| Constantia Healthcare Investments Limited | Professional & scientific | 2023 |
| Constantia Healthcare Limited | Health & social care | 2001 |
| Constantia Living Limited | Health & social care | 2025 |
| Contractor Consultancy CC Ltd | Wholesale & retail | 2024 |
| Corner Boys Limited | Wholesale & retail | 2011 |
| Cornerstone Residences Ltd | Real estate | 2025 |
| Cosimo Living Ltd | Wholesale & retail | 2026 |
| Cosy Hub Ltd | Extraterritorial | 2023 |
| Cotton Puffs Ltd | Wholesale & retail | 2025 |
| Couch Shop Ltd | Wholesale & retail | 2025 |
| Cozysleep Beds Ltd | Manufacturing | 2026 |
| Cozzzy Living Limited | Wholesale & retail | 2017 |
| CP Cleaners Limited | Administrative & support | 2024 |
| Crafted Beds Ltd | Wholesale & retail | 2020 |
| Crafted Slumber Ltd | Manufacturing | 2025 |
| Cranleigh Group Ltd | Real estate | 2025 |
| Crave Box Ltd | Hospitality | 2023 |
| Crawshaw Hall Healthcare Limited | Health & social care | 2012 |
| Crazy Stuff Ltd | Wholesale & retail | 2019 |
| Creamy COW Ltd | Hospitality | 2024 |
| Create Fabrics Ltd | Wholesale & retail | 2019 |
| Credit Hire West Yorkshire Ltd | Administrative & support | 2019 |
| Crillys Limited | Wholesale & retail | 2002 |
| CRK Canopies and Ductwork Ltd | Manufacturing | 2023 |
| Cross Rigg (Holdings) Limited | Real estate | 1992 |
| Crossbeck Investigations Ltd | Administrative & support | 2025 |
| Crossroads Group Limited | Wholesale & retail | 2005 |
| Crown Hygiene Ltd | Administrative & support | 2022 |
| Cryonex AI Limited | Wholesale & retail | 2025 |
| Crystal Clean Centre & Co Ltd | Administrative & support | 2022 |
| CS & Junior Properties Ltd | Real estate | 2022 |
| CS Servicing Limited | Other services | 2019 |
| CSE (Dewsbury) Ltd | Hospitality | 2023 |
| Cures by Nature Ltd | Wholesale & retail | 2024 |
| Curriculum for Tomorrow Ltd | Education | 2024 |
| CUT From a Different Cloth Limited | Agriculture & fishing | 2014 |
| D & B Electrical Ltd | Construction | 2019 |
| D & JOS Ball Pythons Ltd | Wholesale & retail | 2022 |
| D & K Financial Management LLP | | 2018 |
| D G Services (Yorkshire) Ltd | Professional & scientific | 2023 |
| D Sandison Electrical Limited | Construction | 2026 |
| D&K Property Letting Limited | Real estate | 2022 |
| D&S Yorkshire Motors Ltd | Wholesale & retail | 2025 |
| D-Emarket Ltd | Wholesale & retail | 2025 |
| D.A.D. Communications Limited | Wholesale & retail | 2005 |
| D.D. Engineering Holdings Limited | Manufacturing | 2019 |
| D.D. Engineering Limited | Manufacturing | 1997 |
| D2D Beds Ltd | Wholesale & retail | 2026 |
| D4U Deliveries Ltd | Transport & logistics | 2026 |
| DA Care Consultancy Limited | Health & social care | 2025 |
| Daab Tutors Ltd | Education | 2019 |
| Daar Logistics Ltd | Transport & logistics | 2023 |
| Dabhees Limited | Wholesale & retail | 2024 |
| Dabs Scaffolding Yorkshire Limited | Construction | 2020 |
| Dade Properties Limited | Real estate | 2020 |
| Dahlia Mart Ltd | Wholesale & retail | 2024 |
| Daily Local Ltd | Wholesale & retail | 2026 |
| Daisy's Play Centre Limited | Arts & recreation | 2018 |
| Damdee Luxe Limited | Wholesale & retail | 2026 |
| Damp and Mould Busters Limited | Administrative & support | 2026 |
| Dance for Everyone CIC | Education | 2021 |
| Dane Air Ltd | Construction | 2021 |
| Daniyal Beds Ltd | Manufacturing | 2016 |
| Danmac Clinical Installations Ltd | Manufacturing | 2025 |
| Dannerr Tech Limited | Information & communication | 2024 |
| Dapperdonut Ltd | Wholesale & retail | 2025 |