| Bytlan Developments Ltd | Construction | 2024 |
| C Weighell Hedgecutting Ltd | Administrative & support | 2015 |
| Calcaria Cars Ltd | Wholesale & retail | 2025 |
| Calcaria Cleaning Ltd | Administrative & support | 2018 |
| Calcaria Domestic Cleaning Ltd. | Administrative & support | 2022 |
| Calcaria Stoves Limited | Wholesale & retail | 2016 |
| Canvas Accounting Limited | Extraterritorial | 2026 |
| Car Service Packs Limited | Wholesale & retail | 2017 |
| Carolson Group Ltd | Information & communication | 2026 |
| Cecil F.Simms (Holdings) Limited | Real estate | 2020 |
| Cecil F.Simms Limited | Real estate | 1969 |
| Centrescene Limited | Administrative & support | 1989 |
| Centurion Self Storage Ltd | Transport & logistics | 2025 |
| Challenge Cars Ltd | Wholesale & retail | 2023 |
| Chapel House Training and Consultancy Limited | Administrative & support | 2009 |
| Charlotte's Floral Design Ltd | Wholesale & retail | 2020 |
| Chip Technologies Ltd | Information & communication | 2025 |
| Chruthaestus Ltd | Administrative & support | 2021 |
| Chruxis Ltd | Administrative & support | 2021 |
| Church Fenton Community Shop Limited | Wholesale & retail | 2017 |
| Citrouille Consulting Limited | Professional & scientific | 2016 |
| Citrouille Holdings Limited | Financial services | 2024 |
| Clarity & CUT Limited | Manufacturing | 2023 |
| Clarity for MEN CIC | Administrative & support | 2025 |
| Clarity Media Collective Ltd | Professional & scientific | 2026 |
| Clarke & Clarke Consultancy Ltd | Professional & scientific | 2011 |
| Clarkeking Ltd | Professional & scientific | 2025 |
| Class Renewables Ltd | Construction | 2022 |
| Clavane Accountancy Limited | Professional & scientific | 2021 |
| Clear Flow Jetting Ltd | Administrative & support | 2026 |
| Clearflow IP Consulting Limited | Professional & scientific | 2026 |
| CMM Media Limited | Professional & scientific | 2024 |
| Cocksford Residents Association Limited | Households | 2007 |
| Coffee BRO Limited | Hospitality | 2024 |
| Coffee Brothers Limited | Wholesale & retail | 2013 |
| Colm Holdings Ltd | Real estate | 2025 |
| Colton Property Services Limited | Real estate | 2024 |
| Columbus Fifty SIX Limited | Financial services | 2018 |
| Commercial Street MOT Service Centre Ltd | Wholesale & retail | 2022 |
| Concept Confections Limited | Professional & scientific | 2023 |
| Conduit Advisors Limited | Professional & scientific | 2014 |
| Consultec Finance Limited | Professional & scientific | 2025 |
| Cooper & Hall Ltd | Professional & scientific | 2006 |
| Copgrove Village Limited | Households | 2023 |
| CORELOGIC4 Limited | Professional & scientific | 2007 |
| Courtgrange Holdings Ltd | Financial services | 2021 |
| Courtgrange Properties Limited | Real estate | 1970 |
| CR Renewable Services Limited | Professional & scientific | 2023 |
| CR Scrancher Limited | Agriculture & fishing | 2019 |
| Cranky Pants Ltd | Information & communication | 2025 |
| Creative Licence Worldwide Ltd | Professional & scientific | 2016 |
| Criterion Inspection Services Limited | Information & communication | 2013 |
| CRV Properties Limited | Real estate | 2018 |
| Crystal Developments (York) Limited | Construction | 2008 |
| Csotrainingacademy Ltd | Professional & scientific | 2026 |
| CTW Construction Limited | Construction | 2011 |
| Cyclesense Ltd | Wholesale & retail | 2000 |
| D & J Poulter Building Contractors Limited | Construction | 2008 |
| D Laughton Accident Repair Centre Limited | Wholesale & retail | 2011 |
| D Thornton Consulting Ltd | Professional & scientific | 2024 |
| Dalesong Books Limited | Information & communication | 2025 |
| Dalton Consultancy Ltd | Administrative & support | 2026 |
| DAN Linfoot Racing Limited | Other services | 2015 |
| Dark Courier Ltd | Transport & logistics | 2026 |
| Dark Horse Shavings Ltd | Manufacturing | 2018 |
| Data Enterprise Solutions Ltd | Information & communication | 2010 |
| David Collins Solicitors Limited | Professional & scientific | 2009 |
| David Thompson Retail Property Consultant Limited | Real estate | 2018 |
| DBK QS Services Limited | Professional & scientific | 2020 |
| DD Naylor Ltd | Hospitality | 2022 |
| Dejabrew (Calcaria) Limited | Professional & scientific | 2020 |
| Delivering Deliciousness Ltd | Hospitality | 2023 |
| Dellothem Ltd | Administrative & support | 2021 |
| Demir Real Estate Ltd | Real estate | 2025 |
| Denisco Ltd | Financial services | 2018 |
| Design & Build (Yorkshire) Ltd | Construction | 2023 |
| Design Collaboration Limited | Professional & scientific | 2022 |
| Devops Contracting Ltd | Information & communication | 2020 |
| DH & G Treharne Limited | Wholesale & retail | 2003 |
| Diamond Adjusting Services Limited | Financial services | 2017 |
| Digital Twin MEP Ltd | Professional & scientific | 2021 |
| Distinct Flooring Limited | Construction | 2011 |
| Distribution Cable Jointing Group Limited | Financial services | 2023 |
| Distribution Cable Jointing Ltd | Construction | 2003 |
| DL Photo Ltd | Professional & scientific | 2022 |
| Dmapp Limited | Transport & logistics | 2008 |
| DMJ Contracting Limited | Construction | 2025 |
| Dombranes Ltd | Administrative & support | 2021 |
| Dougies Private Hire Ltd | Transport & logistics | 2016 |
| DP Yorkshire Limited | Real estate | 2025 |
| Dragonfly Environmental Consulting Ltd | Professional & scientific | 2021 |
| Drayton Digital Limited | Information & communication | 2002 |
| Driven of York Ltd | Wholesale & retail | 2025 |
| DW Autos Tadcaster Limited | Wholesale & retail | 2014 |
| DW Groundcare Services Limited | Other services | 2020 |
| Dwarrvatark Ltd | Administrative & support | 2021 |
| DWC Livestock Services Ltd | Agriculture & fishing | 2026 |
| Eddy's Moto Ltd | Wholesale & retail | 2010 |
| Electrical Solutions Tadcaster Ltd | Construction | 2026 |
| Ellies Apples Limited | Health & social care | 2024 |