| Coastline Taxis Ltd | Transport & logistics | 2022 |
| Coatech Holdings Limited | Financial services | 2026 |
| Coatech Limited | Construction | 1992 |
| Coba Renewables Ltd | Construction | 2025 |
| Colwyn Properties Limited | Real estate | 2024 |
| Comc Contractors Ltd | Construction | 2022 |
| Commercial Catering Engineers & Installations Ltd | Manufacturing | 2021 |
| Commercial Catering Engineers Ltd | Manufacturing | 2015 |
| Complete Tooling Solutions Limited | Manufacturing | 2003 |
| Connected Solutions Ltd | Information & communication | 2025 |
| Conren Resin Flooring Limited | Construction | 2022 |
| Continental Carousel Limited | Administrative & support | 2026 |
| Corris Caravan Park Limited | Arts & recreation | 1962 |
| Cosy Corner Camp Ltd | Hospitality | 2023 |
| Countryside Wildlife Management Ltd | Construction | 2012 |
| County Online Limited | Information & communication | 1999 |
| Crafthaus Interiors Ltd | Professional & scientific | 2025 |
| Cramers Sandwich Ltd | Hospitality | 2024 |
| Cretepave Ltd. | Construction | 2011 |
| Cross and Co. Properties Ltd | Real estate | 2020 |
| CRT Automation Ltd | Information & communication | 2025 |
| Cruise Play Ltd | Administrative & support | 2022 |
| Cryo Clinix Ltd | Other services | 2021 |
| Cryotherapy Corporation Ltd | Other services | 2022 |
| Cutoff Ltd | Information & communication | 2026 |
| Cwcontracts Electrical & Property Maintanance Ltd | Construction | 2025 |
| Cybernate Ltd | Transport & logistics | 2022 |
| Cygnet Fabrications Limited | Manufacturing | 2009 |
| D & P Conwy Limited | Hospitality | 2017 |
| D Hall Accounting Services Ltd | Professional & scientific | 2015 |
| D L Clampitt Food Service Limited | Wholesale & retail | 2026 |
| D&A PD Limited | Information & communication | 2022 |
| D&D Inns Ltd | Hospitality | 2019 |
| D&R Consultancy Services Ltd | Professional & scientific | 2026 |
| DAN Jones Group Ltd | Construction | 2024 |
| Danro Spuds Ltd | Hospitality | 2025 |
| Danro Sweets Ltd | Wholesale & retail | 2025 |
| DAT Holdings Ltd | Administrative & support | 2020 |
| DC Business Enterprise (UK) Ltd | Real estate | 2022 |
| DCM Groundworks&Contracting. Ltd | Construction | 2025 |
| Ddraig Topography Ltd | Professional & scientific | 2024 |
| Deli on the Hill by Hildebrandts Ltd | Hospitality | 2023 |
| Denbigh Subs Limited | Hospitality | 2023 |
| Designer Bounce Limited | Manufacturing | 2025 |
| Destiny Support Africa International C.I.C. | Administrative & support | 2026 |
| Deux Chevaux LLP | | 2016 |
| Dgrs Morfa Limited | Real estate | 2021 |
| Dial a Ride (Denbighshire) Ltd | Transport & logistics | 1998 |
| Digi Results Inc Ltd | Professional & scientific | 2016 |
| Digital Dazzle Ltd | Wholesale & retail | 2023 |
| Dimart Ltd | Wholesale & retail | 2008 |
| Docea Contract Review Services Ltd | Professional & scientific | 2019 |
| DR C J Herd BDS Dpds Associate Limited | Health & social care | 2025 |
| DR Okoli Locum Services Ltd | Health & social care | 2026 |
| Dragon Body Repairs Ltd | Wholesale & retail | 2021 |
| Dragon Fire Door and Joinery Specialist Ltd | Construction | 2015 |
| Dragon Schoolwear Ltd | Manufacturing | 2016 |
| Drift Radio C.I.C. | Information & communication | 2024 |
| Driveways North Wales Limited | Construction | 2025 |
| DRY Rain Limited | Professional & scientific | 2017 |
| DT Improvement & Construction Ltd | Construction | 2023 |
| Dura Properties Limited | Real estate | 2021 |
| Dust Shack Ltd | Manufacturing | 2020 |
| Dutton & Co Ltd | Professional & scientific | 2013 |
| DWB Event Services Ltd | Administrative & support | 2025 |
| E & V Properties Ltd | Real estate | 2020 |
| Earsol Ltd | Wholesale & retail | 2023 |
| East Leake Village Day Nursery Ltd | Health & social care | 2000 |
| Eben Autos Limited | Wholesale & retail | 2024 |
| Ebrar&Arzu Ltd | Hospitality | 2022 |
| Eco-Hike Trading Ltd | Wholesale & retail | 2025 |
| Ecology Energy Ltd | Professional & scientific | 2022 |
| EDI - Rita Friendly Caravans Ltd | Administrative & support | 2025 |
| Edward Hughes LLP | | 2016 |
| Elcon Fitted Furniture Limited | Manufacturing | 2010 |
| Elite Electrical Contractors (NW) Limited | Construction | 2017 |
| ELM & Vale Digital Ltd | Professional & scientific | 2025 |
| Elsie-Janes Ltd | Health & social care | 2026 |
| ELT Couriers Ltd | Transport & logistics | 2020 |
| Elterwater Limited | Hospitality | 2018 |
| Elwy Properties Rhyl Ltd | Real estate | 2025 |
| Emlik Ltd | Hospitality | 2025 |
| Emozo Afro Caribbean Store Ltd. | Hospitality | 2024 |
| Empowerher Events Ltd | Professional & scientific | 2025 |
| EMW Developments Ltd | Construction | 2014 |
| Enabled Design Ltd | Professional & scientific | 2024 |
| Energy Saving Plus Ltd | Construction | 2024 |
| Equity Project Management & Contracting Limited | Construction | 2024 |
| Ergotech Construction Limited | Construction | 2022 |
| Erva 68 Ltd | Hospitality | 2025 |
| ESP Services Limited | Construction | 2003 |
| Evans Environ Ltd. | Construction | 2012 |
| Excellent Dining Limited | Hospitality | 2019 |
| Excelsior Property NE Ltd | Real estate | 2023 |
| Exotic Car Transportation Ltd. | Transport & logistics | 2025 |
| Expert Bar Solutions Limited | Hospitality | 2014 |
| Expresso Lounge Ltd | Hospitality | 2022 |
| FA Nutra Ltd | Wholesale & retail | 2022 |
| FAB Supply Ltd | Education | 2023 |
| Face 360 Consulting Ltd | Professional & scientific | 2025 |