| Garnett-Hughes Developments Limited | Construction | 2003 |
| GD of Oswestry Ltd | Hospitality | 2015 |
| Geopaws UK Limited | Other services | 2019 |
| GET Real Health Limited | Health & social care | 2020 |
| GHS Europe Ltd | Professional & scientific | 2016 |
| Gibson Property Services Limited | Real estate | 2021 |
| Gilder Wealth Management Limited | Financial services | 2018 |
| Glascoed Residential Care Home Limited | Health & social care | 2013 |
| Glenn Cavill Ltd | Professional & scientific | 2017 |
| Gnome &Rhône Engine Co Ltd | Manufacturing | 2025 |
| Go 2 Drivers Limited | Professional & scientific | 2015 |
| GO2 Industries Limited | Administrative & support | 2025 |
| GO2 Marine Ltd | Transport & logistics | 2022 |
| GO2 People Group Ltd | Professional & scientific | 2011 |
| Golden Vale (Caravans) Limited | Hospitality | 2010 |
| Good Bargains 4 U Ltd | Wholesale & retail | 2023 |
| Grace Grange Ltd | Wholesale & retail | 2017 |
| Grand Bay Estates Ltd | Real estate | 1998 |
| Green Edge Compute Ltd | Information & communication | 2025 |
| Green Lawns NW Ltd | Other services | 2020 |
| Greens Removals (Chester) Ltd | Transport & logistics | 2022 |
| Greentops Properties Ltd | Construction | 2024 |
| Greyrock Marketing Limited | Information & communication | 2020 |
| Groco (Summerhill) Limited | Agriculture & fishing | 2018 |
| Groesfaen Bach Holiday Cottages Limited | Extraterritorial | 2012 |
| Gronant Car Sales Limited | Wholesale & retail | 2003 |
| GROUP247 Limited | Financial services | 2023 |
| Groverde Ltd | Wholesale & retail | 2018 |
| Growing Outside Ltd | Education | 2026 |
| GT GAS Heating Services Ltd | Manufacturing | 2010 |
| GVR Group Limited | Financial services | 2022 |
| Gwyndy Caravan Park Ltd | Hospitality | 2023 |
| Gwynedd Foods Limited | Administrative & support | 2005 |
| H B Surgical Ltd | Professional & scientific | 2024 |
| H Roberts Renewables Ltd | Construction | 2020 |
| H2AIR Services Ltd | Construction | 2017 |
| Hafod-Y-Bryn Pathology Services Limited | Health & social care | 2015 |
| Hairline Inc Limited | Other services | 2016 |
| Hanna Orthopaedic Services Ltd | Health & social care | 2019 |
| Hannan Advisory Ltd | Professional & scientific | 2023 |
| Hannan Property Ltd | Real estate | 2023 |
| Hanover Business Centres Limited | Real estate | 1988 |
| Hans Vetsch Ltd | Manufacturing | 2024 |
| Hansholo Consulting Limited | Professional & scientific | 2012 |
| Hapgood Developments Ltd | Construction | 2013 |
| Harmin Homes Limited | Administrative & support | 2024 |
| Harmony Hub Behaviour Therapy Limited | Public administration | 2023 |
| Harold Smith Payroll Services Limited | Professional & scientific | 2016 |
| Healthcare Staff Recruitment Limited | Administrative & support | 2015 |
| Heathside Bookham Ltd | Households | 2025 |
| Heavy Lift Solutions Ltd | Construction | 2012 |
| Hendleys Heating Ltd | Real estate | 2025 |
| Henson Asset Management Ltd | Professional & scientific | 2019 |
| Highbury Care Homes Limited | Health & social care | 2003 |
| Highland Marine Offshore Services Ltd | Professional & scientific | 2013 |
| Hill Enforcement Services Limited | Administrative & support | 2016 |
| Hive Limited | Information & communication | 2000 |
| HJ Home & Property Services Ltd | Administrative & support | 2026 |
| Holmes Hose Limited | Manufacturing | 1980 |
| Home Appliance Repair Limited | Other services | 2013 |
| Homer Homes Limited | Real estate | 2019 |
| Hotel Developments Limited | Construction | 2016 |
| Housekeeping Support Services Ltd | Administrative & support | 2024 |
| Howdoyoudoodle Ltd | Extraterritorial | 2009 |
| HRJ Property Limited | Real estate | 2024 |
| Hughes Scaffolding Contractors Ltd | Professional & scientific | 2014 |
| Hulse Developments Ltd | Construction | 2023 |
| Hvac Developments Ltd | Real estate | 2022 |
| Hvac Property Limited | Real estate | 2025 |
| Hvac Recruitment Limited | Administrative & support | 2005 |
| Hydro Plumbing & Heating Ltd | Construction | 2021 |
| I L S Renewables Ltd. | Professional & scientific | 2023 |
| I S AVA Ltd | Health & social care | 2024 |
| I W Hughes Construction Ltd | Construction | 2015 |
| I W Hughes Services Limited | Water & waste | 2010 |
| I'R DIM Limited | Wholesale & retail | 2013 |
| I4TG Ltd | Other services | 2018 |
| IAN Hodgkinson Plumbing and Heating Ltd | Other services | 2019 |
| IAN Mcguire Management Company Ltd | Real estate | 2018 |
| ICM Enterprises (UK) Limited | Professional & scientific | 2009 |
| Ideal Carpets (Prestatyn) Limited | Wholesale & retail | 2019 |
| IEC Management and Estates Limited | Real estate | 2025 |
| Igreenkeeper Ltd | Professional & scientific | 2012 |
| Imperium Plastering Ltd | Construction | 2025 |
| Indigo Blue Projects Ltd | Real estate | 2019 |
| Indilink Limited | Hospitality | 2005 |
| Industrial Equipment and Contracts Limited | Construction | 2012 |
| Inertia Socks Ltd | Wholesale & retail | 2025 |
| Ingma Marketing Services Ltd | Professional & scientific | 2025 |
| Inpp Limited | Health & social care | 2003 |
| Inspired Aluminium UK Ltd | Construction | 2019 |
| Instagame Limited | Arts & recreation | 2022 |
| Intechnique Limited | Information & communication | 2018 |
| Isabel Kozarska Aesthetic Expert Ltd | Other services | 2019 |
| Ispy Limited NW Ltd | Other services | 2020 |
| J & L Elevator Components (EOT) Limited | Financial services | 2021 |
| J & M Developments North Ltd | Construction | 2022 |
| J J a Estates Limited | Real estate | 2010 |
| J J Jones (Wholesale Coal Merchants) Limited | Wholesale & retail | 2009 |
| J R Biomedical Limited | Professional & scientific | 2005 |