| Gwrych Trust C.I.C. | Hospitality | 2014 |
| HAC Services Ltd | Administrative & support | 2023 |
| Hamilton Security Systems Ltd. | Administrative & support | 2012 |
| Happy Days Childcare Rhyl Ltd | Health & social care | 2026 |
| Hapus Yurt Ltd | Hospitality | 2026 |
| Harrys Cafe 2025 Ltd | Hospitality | 2025 |
| Hazell Jones Computer Services Limited | Information & communication | 1997 |
| Healing Sounds With Tina Ltd | Arts & recreation | 2024 |
| Health Foods Group Ltd | Wholesale & retail | 2023 |
| Heli Botanica Ltd | Manufacturing | 2026 |
| Henblas Holiday Cottages Limited | Hospitality | 2003 |
| Hendre Wind Limited | Energy | 2016 |
| High Peak Support Services Limited | Information & communication | 2006 |
| Highspechousing Limited | Real estate | 2023 |
| Hikari Scents Limited | Wholesale & retail | 2026 |
| Hollow Oak Glamping Ltd | Hospitality | 2019 |
| Hone ENG Limited | Extraterritorial | 2017 |
| Hops & Scotch Ltd | Hospitality | 2020 |
| House of Talog Ltd | Wholesale & retail | 2026 |
| Howatson Property Ltd | Real estate | 2022 |
| Hoywell 66 Limited | Extraterritorial | 2013 |
| Hughes Leisure Consultants Limited | Professional & scientific | 2020 |
| Hunters Hamlet Caravan Park Limited | Hospitality | 2024 |
| I & HL Williams CYF | Agriculture & fishing | 2010 |
| I & T Limited | Other services | 2010 |
| I and JJ Properties Limited | Households | 2025 |
| IAN Davies Courier Ltd | Transport & logistics | 2021 |
| IAOO2025 Limited | Administrative & support | 2023 |
| Icaneverything Ltd | Administrative & support | 2023 |
| Ijacks Properties Limited | Real estate | 2026 |
| Impact Creative Design Limited | Professional & scientific | 2016 |
| Infinity Home Renovations Ltd | Construction | 2023 |
| Insightion Limited | Professional & scientific | 2015 |
| IXL Oilfield Consulting Ltd | Professional & scientific | 2022 |
| Izegoldwatches Ltd | Wholesale & retail | 2023 |
| J M Williams Property Services Ltd | Construction | 2026 |
| J&L Landscapes Limited | Administrative & support | 2017 |
| JAS Chippy Ltd | Hospitality | 2024 |
| JBD Business Solutions Limited | Professional & scientific | 2019 |
| JBS Financial Services Limited | Professional & scientific | 2015 |
| JL Contracting and Consultancy Ltd | Information & communication | 2025 |
| JMC Supplements Ltd | Wholesale & retail | 2025 |
| JNR Capitals Limited | Hospitality | 2025 |
| JO Autos Limited | Wholesale & retail | 2026 |
| Jo-At-Mon Limited | Real estate | 2000 |
| Johnny Pizza Italian Style Limited | Hospitality | 2025 |
| Jones & Fishwick Limited | Construction | 2003 |
| JRJ Property Letting Ltd | Real estate | 2025 |
| JRS Holdings Limited | Construction | 2015 |
| JRS Mechanical Services Limited | Construction | 1992 |
| JRS Special Projects Limited | Construction | 2001 |
| Just Blinds North Wales Limited | Wholesale & retail | 2026 |
| JV Heating Installations Ltd | Construction | 2024 |
| K.R.Automotive Mobile Vehicle Services Ltd | Wholesale & retail | 2024 |
| K2 Deliveries Ltd | Transport & logistics | 2025 |
| Kashlab Ltd | Wholesale & retail | 2025 |
| Kazza Marine Limited | Hospitality | 2017 |
| KC Heating Services Limited | Construction | 2020 |
| KD Coastline Cleaning Services Ltd | Administrative & support | 2025 |
| KIM Sutherland Limited | Professional & scientific | 2012 |
| Kinsman Security Ltd | Administrative & support | 2025 |
| Kmotionchronicles Ltd | Wholesale & retail | 2025 |
| Knapper Pubs Limited | Hospitality | 2016 |
| KNK Pubs Ltd | Hospitality | 2025 |
| Kwana Limited | Professional & scientific | 2012 |
| L and S Pubs Ltd | Professional & scientific | 2017 |
| L&B Building & Roofing Contractors Ltd | Construction | 2026 |
| L&M Mitchell's Limited | Administrative & support | 2024 |
| LA Transfers Ltd | Transport & logistics | 2024 |
| Laka Motors Limited | Hospitality | 1983 |
| Lakeside Cottages (Abergele) Limited | Hospitality | 2015 |
| LD Coastline Property Ltd | Real estate | 2025 |
| Learmont Consulting Ltd | Professional & scientific | 2016 |
| Leonard Jinks Architectural Consultants Limited | Professional & scientific | 2002 |
| LJV Property Ltd | Real estate | 2025 |
| Llaeth Kinmel CYF | Agriculture & fishing | 2020 |
| Lloyds Caravan Sales Co. Limited | Wholesale & retail | 1991 |
| LNB Management and Consultancy Ltd | Professional & scientific | 2025 |
| Lock & Jones Rendering Ltd | Construction | 2025 |
| Luestte Ltd | Wholesale & retail | 2025 |
| LVL 5 Gyms Limited | Arts & recreation | 2021 |
| Lyn-An Limited | Transport & logistics | 2012 |
| Lysa Training Ltd | Education | 2025 |
| M&M Competitions Ltd | Administrative & support | 2025 |
| M26 Garage Limited | Wholesale & retail | 2026 |
| Madlilos Limited | Construction | 2025 |
| Mae-Haus Ltd | Wholesale & retail | 2025 |
| Magic of Time Ltd | Information & communication | 2023 |
| Mahusay Ltd | Health & social care | 2019 |
| MAL Environmental Ltd | Extraterritorial | 2020 |
| Mal-Eod Ltd | Construction | 2024 |
| Mal-Explosive Ordnance Disposal Ltd | Administrative & support | 2010 |
| Marli Homes Limited | Real estate | 2011 |
| Marshall Group Enterprises Ltd | Arts & recreation | 2016 |
| MB & AB Trading Ltd | Other services | 2013 |
| MB in MB Limited | Health & social care | 2024 |
| MC Super Store Ltd | Wholesale & retail | 2026 |
| Mcbride Consulting Limited | Information & communication | 2020 |
| Mcgeeconsult Ltd | Professional & scientific | 2024 |
| MD Independent Limited | Real estate | 2024 |