| Consult Rfid Limited | Professional & scientific | 2012 |
| Consultonline Limited | Information & communication | 2018 |
| Contact Dynamics Ltd | Professional & scientific | 2024 |
| Conway and Jenssons Ltd | Real estate | 2024 |
| Cooper and Ace Limited | Information & communication | 2020 |
| Copeland Fencing Limited | Construction | 2011 |
| Copeland Property Holdings Limited | Real estate | 2022 |
| Corban Pharma (UK) Ltd | Wholesale & retail | 2024 |
| Corbillon Ltd | Professional & scientific | 2011 |
| Core Belief Pilates Ltd. | Administrative & support | 2014 |
| Corecare Global Ltd | Wholesale & retail | 2014 |
| Corecare Holdings Ltd | Wholesale & retail | 2016 |
| Corkery Healthcare Limited | Health & social care | 2023 |
| Coromics Limited | Health & social care | 2021 |
| Corporate Intelligence Ltd | Information & communication | 2018 |
| Corporate Supplies Ltd | Professional & scientific | 2023 |
| Corretex Maintenance Ltd | Manufacturing | 2025 |
| Cosmiko Limited | Manufacturing | 2020 |
| Counsell Advisory Limited | Extraterritorial | 2016 |
| Country Dog Walkers Ltd | Other services | 2026 |
| Country Partners Ltd | Other services | 2020 |
| Country Warmth Cooking and Heating Services Ltd. | Construction | 2019 |
| County Mowers Wetherby Limited | Manufacturing | 2018 |
| County Planning Ltd | Professional & scientific | 2018 |
| Court Craft Education Ltd | Education | 2025 |
| Couzens Consulting Ltd | Professional & scientific | 2017 |
| Cowthorpe Residential Management Company Limited | Households | 2022 |
| Coxwold Survey & Construct Ltd | Construction | 2017 |
| Crag View Equine Limited | Administrative & support | 2020 |
| Craig Santer Limited | Financial services | 2002 |
| Craven Investments Limited | Financial services | 2024 |
| Crazy Tykes Ltd. | Arts & recreation | 2004 |
| CRC Release Agents Limited | Wholesale & retail | 2024 |
| Creative Product Solutions Limited | Wholesale & retail | 2014 |
| Creative Recruitment Solutions Limited | Administrative & support | 2008 |
| Creative Technical Services Ltd | Professional & scientific | 2006 |
| Crescent Corporate Finance Limited | Financial services | 2014 |
| Crimple Homes Ltd | Real estate | 2024 |
| Crisp Business Psychology Ltd. | Professional & scientific | 2015 |
| Croft House Services Limited | Other services | 2023 |
| Crosfill Investments Limited | Professional & scientific | 2017 |
| Crossley Wood Limited | Real estate | 2017 |
| Crown Cottage Construction Limited | Real estate | 2001 |
| Crowns Recruitment Limited | Administrative & support | 2011 |
| Cruddos Design Limited | Professional & scientific | 2025 |
| Cruddos Landscaping Decking Limited | Administrative & support | 2025 |
| Crystal Strategy Solutions Ltd | Professional & scientific | 2023 |
| Cseleven Ltd | Arts & recreation | 2021 |
| Cubrick Limited | Households | 2021 |
| Cumulus Construction Limited | Construction | 2008 |
| Curelife Ltd | Wholesale & retail | 2016 |
| Cutpro Clothing Limited | Manufacturing | 2016 |
| Cvdc Properties Limited | Real estate | 2017 |
| CW Ribston Limited | Professional & scientific | 2025 |
| CW Wine Group Limited | Financial services | 2018 |
| Cwuk Investments Limited | Financial services | 2018 |
| Cyclone Finishing Solutions Limited | Wholesale & retail | 2025 |
| Cynopsys Limited | Information & communication | 2015 |
| Cyon Fitness Ltd | Arts & recreation | 2023 |
| D & C Hospitality Ltd | Hospitality | 2025 |
| D & J Estate Limited | Households | 1998 |
| D Best Garden & Trees Services Ltd | Agriculture & fishing | 2025 |
| D J Hemingway Limited | Construction | 2020 |
| D V & C W Holdings Ltd | Financial services | 2018 |
| D Wilshaw Deliveries Ltd | Transport & logistics | 2025 |
| D. Benson & Co. Limited | Real estate | 1960 |
| D.L.Downie Ltd | Professional & scientific | 2014 |
| DA Carlo Limited | Hospitality | 2022 |
| Daco Property Maintenance Limited | Administrative & support | 2022 |
| Daemon Recruitment Limited | Administrative & support | 2023 |
| DAN Blackman Cardiology Ltd | Health & social care | 2018 |
| DAN Firth Creative Limited | Professional & scientific | 2014 |
| Danby Electrical Solutions Ltd | Construction | 2026 |
| Daneworks Ltd | Professional & scientific | 2023 |
| Daniel Kent Limited | Information & communication | 2013 |
| Daniel Kimberling Ltd | Professional & scientific | 2022 |
| Daniel Stanway Ltd | Extraterritorial | 2014 |
| Dansho Ltd | Financial services | 2016 |
| Darnell Portfolio Group Limited | Real estate | 2026 |
| Dart 22 Investments Ltd | Extraterritorial | 2024 |
| Dart Business Logistics Ltd | Transport & logistics | 2019 |
| Data Bubble Consultancy Limited | Information & communication | 2009 |
| Data Connect (UK) Limited | Information & communication | 2004 |
| Data Connect Group Limited | Information & communication | 2017 |
| Data-Ish Ltd | Information & communication | 2021 |
| Databasemagic Limited | Professional & scientific | 2000 |
| Databreeze Ltd | Information & communication | 2021 |
| Dataprotectionteam Limited | Information & communication | 2023 |
| Dave Evans Limited | Professional & scientific | 2022 |
| Dave Howard Engineering Limited | Manufacturing | 2015 |
| David Burland Heating Ltd | Construction | 2023 |
| David Ethell Consulting Ltd | Professional & scientific | 2020 |
| David Roberts Investments Limited | Financial services | 2002 |
| David Scrivener Physiotherapy Services Ltd | Health & social care | 2015 |
| Davis & Co Property Limited | Real estate | 2021 |
| Day and Night Limited | Professional & scientific | 2019 |
| Day&Night Social Care Ltd | Health & social care | 2018 |
| DC Attachments Ltd | Wholesale & retail | 2021 |
| DCS Holdings Limited | Information & communication | 1999 |
| DCS IT Management Limited | Information & communication | 2014 |