| Heritage Court (Acrefair) Management Company Limited | Real estate | 2024 |
| Heritage Court (Mold) Management Company Limited | Households | 2001 |
| Heritage Hair and Beauty Studio Ltd | Other services | 2026 |
| Hero Hands Care Ltd | Health & social care | 2026 |
| Herrik Cellar Services Limited | Manufacturing | 2019 |
| Hers and HIS Limited | Wholesale & retail | 2026 |
| Hestia Fire Shield Ltd | Other services | 2025 |
| Hexagon-Hgn Limited | Wholesale & retail | 2006 |
| HGB Assets Limited | Real estate | 2026 |
| HGB Hold Co Limited | Financial services | 2026 |
| HHR Care Services Ltd | Health & social care | 2022 |
| High Street Disserts Ltd | Wholesale & retail | 2026 |
| Higher Training Limited | Professional & scientific | 2010 |
| Highgrove Wealth Management Ltd | Financial services | 2020 |
| Hilfit Engineering Limited | Professional & scientific | 2016 |
| Hillcliff Commercial Property Ltd | Real estate | 2024 |
| Hillcliff Contracts Limited | Construction | 2013 |
| Hillcliff Holdings Ltd | Real estate | 2019 |
| Hillock Farm (Wales) Limited | Real estate | 2021 |
| Hinton Tree Services Ltd | Agriculture & fishing | 2026 |
| Hipserver Ltd | Professional & scientific | 2003 |
| Hiran Superstore Ltd | Wholesale & retail | 2025 |
| Hire Class NW Limited | Administrative & support | 2025 |
| Hiru Talent Ltd | Administrative & support | 2026 |
| Hispeed Tyres Limited | Extraterritorial | 1985 |
| HJ Training Solutions Limited | Education | 2017 |
| Hjcp Catering Limited | Hospitality | 2024 |
| HJF Groundworks Ltd | Construction | 2022 |
| HJF Stoves Ltd | Construction | 2022 |
| HL Flooring Ltd | Construction | 2019 |
| HL Luxury Nails Ltd | Other services | 2026 |
| HLC Radiology Limited | Health & social care | 2024 |
| HMC Media Ltd | Information & communication | 2024 |
| HMC Petcare Ltd | Other services | 2024 |
| HMS Chester Ltd | Real estate | 2021 |
| HNP Signs & Numbers Ltd | Manufacturing | 2026 |
| Hogg Brooke Ltd | Wholesale & retail | 2025 |
| Hohner Automation Limited | Manufacturing | 1980 |
| Hoksm Media Ltd | Information & communication | 2024 |
| Holding Habitats Community Interest Company | Professional & scientific | 2012 |
| Holdings at 87 Limited | Real estate | 2016 |
| Holiday Homes Sales Limited | Hospitality | 2025 |
| Holiday Static Caravan Sales Limited | Hospitality | 2025 |
| Holistic Sun Ltd | Other services | 2019 |
| Holmzy Homes Limited | Real estate | 2024 |
| Home & Garden BDG Ltd | Wholesale & retail | 2025 |
| Home Care Agency Ltd | Administrative & support | 2026 |
| Home Design Solutions Limited | Professional & scientific | 2007 |
| Home Farm Overton Limited | Agriculture & fishing | 2025 |
| Home of Offices Limited | Real estate | 2017 |
| Home Style Carpets & Flooring (Chester) Limited | Wholesale & retail | 2016 |
| Home Style Property Maintenance (Wrexham) Limited | Construction | 2019 |
| Home-Start County Borough of Wrexham | Health & social care | 2004 |
| Homedale Construction Ltd | Construction | 1999 |
| Homefarm Caravan Storage Limited | Hospitality | 2018 |
| Homespot Property Investments Ltd | Real estate | 2024 |
| Homestead Garage (Llay) Limited | Wholesale & retail | 2023 |
| Homestead Nursery Limited | Health & social care | 2019 |
| Honey ELM Mindful Centre Limited | Health & social care | 2025 |
| Honeycomb Construction Ltd | Construction | 2023 |
| Hooson Homes Ltd | Construction | 2009 |
| Hope Pizza House Ltd | Hospitality | 2017 |
| Horace Apollo Limited | Health & social care | 2022 |
| Hoseley Farms Limited | Agriculture & fishing | 2004 |
| Hot Wires Limited | Construction | 2009 |
| Hotbinz Ltd | Administrative & support | 2018 |
| Hotel Wrexham Ltd | Hospitality | 2026 |
| House DE Novo (Hartburn) Limited | Other services | 2018 |
| House of Rayiha Ltd | Wholesale & retail | 2023 |
| Howe Business Services Ltd | Administrative & support | 2021 |
| Howen Corporate Services Limited | Other services | 2019 |
| Howsons at Home Limited | Real estate | 2008 |
| Hrjjones Ltd | Professional & scientific | 2025 |
| HSM Builders Ltd | Construction | 2025 |
| HSM Property Services Ltd | Construction | 2016 |
| Hub Market Hub Ltd | Wholesale & retail | 2024 |
| Hubbards Purchasing Consultancy Ltd | Construction | 2007 |
| Hughes Brothers Building Contractors Ltd | Construction | 2011 |
| Hughes O'Hanlon Limited | Professional & scientific | 2023 |
| Hugmore Limited | Agriculture & fishing | 2015 |
| Human Cards Ltd | Wholesale & retail | 2026 |
| Humble and Whole Bakery Limited | Manufacturing | 2024 |
| HV Asset Replacement Ltd | Professional & scientific | 2026 |
| HWA Consulting Ltd | Information & communication | 2023 |
| Hyder Technology Systems Limited | Information & communication | 2023 |
| Hydex Limited | Administrative & support | 2007 |
| Hydr 2015 Cyfyngedig | Information & communication | 2015 |
| Hydr 2019 Limited | Professional & scientific | 2019 |
| Hydr Limited | Information & communication | 2012 |
| Hydr Rhyngwladol Cyfyngedig | Information & communication | 2014 |
| Hydro Aluminium Deeside Limited | Manufacturing | 1984 |
| Hygge Limited | Administrative & support | 2003 |
| Hyserv Engineering Services Ltd | Construction | 2013 |
| Hywyn Limited | Information & communication | 2008 |
| I & O Transports Ltd | Transport & logistics | 2024 |
| I & R Marshall Plant Hire Limited | Construction | 2005 |
| I Propose 2U Events Ltd | Hospitality | 2023 |
| I&S Contracting Ltd | Extraterritorial | 2022 |
| I&S Utilities Ltd | Construction | 2022 |
| I. Matters Eyecare Ltd | Health & social care | 2012 |