| Heaven Sent Productions Ltd. | Arts & recreation | 2000 |
| Highlands Close Limited | Households | 2025 |
| HLA Wind Ltd | Professional & scientific | 2026 |
| Holiday Lets by Lisa and Heidi Limited | Real estate | 2023 |
| Holywell Signs Ltd | Manufacturing | 2024 |
| Home Service Investments Limited | Administrative & support | 2005 |
| Home-Run Surveys Limited | Professional & scientific | 2025 |
| Hook Stap Ltd | Professional & scientific | 2025 |
| Horizon Breaks Letting Services Ltd | Hospitality | 2023 |
| HR Anchor Limited | Administrative & support | 2019 |
| Hughes Homes Ltd | Real estate | 2018 |
| Hughes Structural Steel Limited | Construction | 2018 |
| Hurst Security Systems Limited | Administrative & support | 2008 |
| HWB Flooring Ltd | Wholesale & retail | 2024 |
| Hybrid LAB Ltd | Arts & recreation | 2025 |
| Hygiene Cleaning Solutions (NW) Limited | Administrative & support | 2021 |
| I Wish Ltd | Wholesale & retail | 2011 |
| I4 Factory Solutions Limited | Information & communication | 2019 |
| Ickle Peanut Ltd | Administrative & support | 2017 |
| ICT SME Research Europe Limited | Information & communication | 2009 |
| Ideas for Research and Innovation Ltd | Information & communication | 2023 |
| Ikigai Wellness Limited | Other services | 2026 |
| Imperial Ice Stars Limited | Arts & recreation | 2005 |
| Income Tax Solutions Ltd | Professional & scientific | 2024 |
| Independence Travel Ltd | Transport & logistics | 2026 |
| Indie Orthotics Ltd | Wholesale & retail | 2025 |
| Ingram & Dawson Records Ltd | Arts & recreation | 2020 |
| Intellec Electrical Services Ltd | Construction | 2021 |
| Intero Digital Ltd | Professional & scientific | 2025 |
| Inwood (Cymru) Limited | Manufacturing | 2003 |
| Isfahan Foods Limited | Hospitality | 2024 |
| ISO Safe Ltd | Professional & scientific | 2024 |
| J and J Caravans Limited | Wholesale & retail | 2004 |
| J D Jones Contractors (North Wales) Limited | Construction | 2005 |
| J M Renewable Solutions Limited | Professional & scientific | 2014 |
| J Packham Construction Ltd | Construction | 2025 |
| J&M Pearson Associates Ltd | Information & communication | 2023 |
| J.M.S. Vehicle Repairs Ltd | Wholesale & retail | 2023 |
| J.R Tattoo Limited | Other services | 2018 |
| J.V.Banks Limited | Extraterritorial | 1998 |
| Jackson's Garden Centre Limited | Wholesale & retail | 2010 |
| JAG Advisory and Services Limited | Professional & scientific | 2025 |
| Janes Taxis Ltd | Transport & logistics | 2023 |
| Jarela Ltd | Wholesale & retail | 2025 |
| Jay's Cafe Ltd | Hospitality | 2018 |
| Jay's Fresh Milk Ltd | Wholesale & retail | 2024 |
| Jeffs Market Limited | Wholesale & retail | 2023 |
| Jj's Studios Ltd | Arts & recreation | 2020 |
| JLR Heat Limited | Construction | 2026 |
| John Burrows Limited | Manufacturing | 2016 |
| Johnson Property Limited | Construction | 2004 |
| JPH Architects Limited | Professional & scientific | 2007 |
| Jsr-Consultants-Uk Limited | Professional & scientific | 2026 |
| Jtcox Ltd | Construction | 2022 |
| Juilet Healthcare Services Ltd | Health & social care | 2021 |
| Just Imagine Contract Interiors Limited | Professional & scientific | 2006 |
| Just Kitchens & Bedrooms Associates Limited | Construction | 2012 |
| K&A Rentals Limited | Hospitality | 2025 |
| K-Tech Automation Limited | Manufacturing | 2014 |
| K2 Convenience Store Ltd | Wholesale & retail | 2026 |
| Kaansa NW Limited | Real estate | 2025 |
| Kamranz Limited | Hospitality | 2026 |
| Kearsley Brickwork Ltd | Construction | 2019 |
| Kebab KNG Limited | Hospitality | 2024 |
| Keepmore Finance Ltd | Financial services | 2026 |
| Kelly's Holdings Ltd | Real estate | 2016 |
| Kendrick Engineering Limited | Manufacturing | 1984 |
| Kens Chester Limited | Hospitality | 2024 |
| Kerbside Ltd | Wholesale & retail | 2019 |
| Kevco Construction UK Ltd | Construction | 2013 |
| Kevco Developments Ltd | Real estate | 2024 |
| Kevco Property Ltd | Real estate | 2024 |
| Keymotive Auto Locksmith Ltd | Wholesale & retail | 2024 |
| Kimberley Medical Aesthetics Ltd | Health & social care | 2026 |
| Kimpter Ltd | Construction | 2022 |
| King DO Restaurant Limited | Hospitality | 2008 |
| Kinmel Bay & Towyn Sports and Recreation Association Limited | Arts & recreation | 1996 |
| Kinmel Bay Church | Other services | 2002 |
| Kinmel Campers Ltd | Wholesale & retail | 2025 |
| Kinmel Kitchen Limited | Hospitality | 2014 |
| KJB Roofing Specialists Ltd. | Construction | 2024 |
| Kj’S Rental Services Ltd | Real estate | 2025 |
| KK Property and Developments Ltd | Real estate | 2026 |
| Knockout Arcades Ltd | Manufacturing | 2021 |
| Kopia Ltd | Real estate | 2025 |
| KS Caravans Limited | Hospitality | 2026 |
| Ktcc Ltd | Education | 2026 |
| Kuklous Holdings Ltd | Real estate | 2019 |
| L & C Cables Limited | Information & communication | 2021 |
| L Pearce Development Ltd | Real estate | 2023 |
| L Williams Marine Ltd | Manufacturing | 2026 |
| LA Steelworks Ltd | Manufacturing | 2018 |
| Lakeside Residential Development Limited | Real estate | 2021 |
| Langdale 8 Limited | Hospitality | 2023 |
| Lashwin Private Ltd | Wholesale & retail | 2026 |
| Law Construction (North West) Limited | Construction | 2017 |
| LB Smart Trading Ltd | Manufacturing | 2019 |
| Lbcommerce Ltd | Wholesale & retail | 2022 |
| LCA Multi Trade Ltd | Construction | 2023 |
| LCA Property and Maintenance Ltd | Real estate | 2026 |