| D & S Living Solutions Limited | Real estate | 2025 |
| D T Jones & SON Limited | Agriculture & fishing | 2003 |
| Daem Ltd | Wholesale & retail | 2026 |
| DAN Carroll Groundworks Ltd | Construction | 2021 |
| Danric Electrical Limited | Wholesale & retail | 2012 |
| David Cooper Ltd | Real estate | 2011 |
| Deerfield Land and Estates Limited | Real estate | 2003 |
| Dewi Owen Ltd | Real estate | 2025 |
| DGG Holdings (North Wales) Limited | Financial services | 2021 |
| DI Jones Heating Engineers Limited | Construction | 2013 |
| Diamond Brickwork and Groundworks Ltd | Construction | 2024 |
| Dianoia Consulting Limited | Professional & scientific | 2012 |
| Differentiate Technology and Consulting Limited | Information & communication | 2011 |
| DIG IT Agility Shows Ltd | Arts & recreation | 2015 |
| Dinas Penmaen Limited | Real estate | 2021 |
| Dolben Properties Ltd | Real estate | 2020 |
| Doodleit Ltd | Information & communication | 2010 |
| Dragon Digital Ltd | Information & communication | 2024 |
| Dragon Fencing Ltd | Administrative & support | 2026 |
| Drovers Family PUB Ltd | Hospitality | 2020 |
| Duffields Technical Services Ltd | Manufacturing | 2020 |
| Dyfed Jones Electrical Ltd | Construction | 2015 |
| Dyffryn Physio Limited | Health & social care | 2003 |
| Dylan C Jones Ltd | Manufacturing | 2013 |
| Dylan W Roberts Ltd | Agriculture & fishing | 2026 |
| Eagle Containers Limited | Administrative & support | 1991 |
| Eco Compliance Guru Ltd | Professional & scientific | 2023 |
| Ecoliving Properties Limited | Real estate | 2024 |
| ED Edwards Ltd | Information & communication | 2016 |
| Edmunds - Scaffolding Ltd. | Construction | 2016 |
| Edwards Roofing (NW) Ltd | Construction | 2015 |
| Elite-Ex Ltd | Extraterritorial | 2023 |
| Emma Louisa Aesthetics Ltd | Health & social care | 2020 |
| Endex Engineering Services Ltd | Professional & scientific | 2024 |
| Ents Safety Support Ltd | Professional & scientific | 2026 |
| Equine Osteopaths Limited | Professional & scientific | 2013 |
| Equipment Distributors Group Enterprise Limited | Wholesale & retail | 1992 |
| Erhare-Ovwra Therapy Centre Ltd. | Health & social care | 2025 |
| ESP Technology Limited | Professional & scientific | 2011 |
| Evoke Analytics Limited | Information & communication | 2022 |
| Fassion Ltd | Wholesale & retail | 2019 |
| Fender Leisure Ltd | Hospitality | 2026 |
| Fieldwork Live Ltd. | Wholesale & retail | 2024 |
| Fieldwork Logistics Ltd | Hospitality | 2025 |
| Financial Simplicity Limited | Financial services | 2013 |
| Find Your Footsteps Recruitment Ltd | Administrative & support | 2025 |
| Firescope Ltd | Administrative & support | 2025 |
| First Option Storage Limited | Transport & logistics | 2018 |
| Fitness Coordinates Ltd | Education | 2019 |
| Flash Woods Estate Ltd | Real estate | 2025 |
| Forests & Fetch Ltd | Other services | 2021 |
| Forma Build Ltd | Construction | 2014 |
| Four Paws Inn Ltd | Other services | 2021 |
| Fueltech Service Ltd | Wholesale & retail | 2024 |
| Fueltech Solutions Ltd | Wholesale & retail | 2026 |
| FWH Catering Ltd | Hospitality | 2022 |
| G & H Hardinges Ltd | Wholesale & retail | 2009 |
| G Edwards Haulage Ltd | Transport & logistics | 2026 |
| G J Teeson Ltd | Construction | 2012 |
| G Jones Cattle Services Ltd | Agriculture & fishing | 2019 |
| G Parry Limited | Financial services | 2022 |
| Gell Farm Ltd | Wholesale & retail | 2021 |
| Genetrix Studio Ltd | Professional & scientific | 2019 |
| Geoff's Tackle & Bait Ltd | Wholesale & retail | 2023 |
| Gethin Limited | Other services | 2022 |
| GMD Forestry Limited | Agriculture & fishing | 2015 |
| Godfrey Group Facilities Limited | Administrative & support | 2015 |
| Gorwel Glas Ltd | Real estate | 2017 |
| Green BUG Ltd | Administrative & support | 2011 |
| Griffith-Parry Ltd | Real estate | 2026 |
| Gwaith Metal Work Ltd | Manufacturing | 2026 |
| Gweld Mynydd Management Limited | Households | 2025 |
| Gwyl Rhuthun Cyfyngedig | Arts & recreation | 2022 |
| H & C Howatson Limited | Construction | 2021 |
| H & J Owen Investments Ltd | Real estate | 2018 |
| H C F S Limited | Construction | 2006 |
| H.E.S.E.S. Limited | Construction | 2008 |
| H.G.R. Jennings Limited | Wholesale & retail | 2011 |
| H2O Profile Cutting Ltd | Manufacturing | 2018 |
| Hafan Clwyd Residents Association Limited | Households | 1984 |
| Hashim Shaver Ltd | Other services | 2023 |
| Hattwood Affiliates Limited | Administrative & support | 2012 |
| Hearshop.Co.Uk Limited | Wholesale & retail | 2019 |
| Heddwyn Hughes Limited | Construction | 2009 |
| HMH Building and Renovation Ltd | Construction | 2025 |
| HNJ Property Management Ltd | Households | 2022 |
| Hobson Tax Consulting Ltd | Professional & scientific | 2009 |
| Hookedonflies Ltd | Information & communication | 2025 |
| Hooklift Trailers Limited | Manufacturing | 2019 |
| Hybrid Energy Hire Limited | Administrative & support | 2024 |
| I & E Building Ltd | Construction | 2023 |
| I.H. Kelly Limited | Other services | 2005 |
| Ibdon Limited | Information & communication | 2018 |
| IN Focus Adhd Management Ltd | Health & social care | 2026 |
| Indigo Productions Limited | Arts & recreation | 2016 |
| Innovative Natural Technology Limited | Professional & scientific | 2025 |
| Intelligent Moorings Limited | Professional & scientific | 2019 |
| J & D Morgan Limited | Real estate | 2015 |
| Jacques Ruthin Limited | Hospitality | 2024 |
| JAM Digital Services Ltd | Information & communication | 2023 |