| Frog Bikes International Limited | Professional & scientific | 2026 |
| Frog Bikes Manufacturing Limited | Manufacturing | 2026 |
| FS Social Work Services Limited | Health & social care | 2024 |
| Furniture Recovery Ltd | Manufacturing | 2020 |
| G & L Services Cable Contractors Limited | Construction | 2003 |
| G C Windows Limited | Construction | 2009 |
| G-Tap Ltd | Construction | 2019 |
| Gareth Betts Strength & Performance Ltd | Arts & recreation | 2026 |
| Gareth Webb Heating Services Ltd | Construction | 2022 |
| Garndiffaith RFC Limited | Arts & recreation | 2016 |
| Garrett Granby Ltd | Wholesale & retail | 2025 |
| Gary Needs Plumbing & Heating Ltd | Construction | 2014 |
| Gatton Horley Ltd | Wholesale & retail | 2025 |
| GB Caravans & Servicing Ltd | Manufacturing | 2020 |
| GB Landscapes & Tree Services Ltd | Administrative & support | 2026 |
| GB Painting & Decorating Limited | Construction | 2022 |
| GC Manufacturing Limited | Manufacturing | 2019 |
| GC Windows (North East) Limited | Manufacturing | 2019 |
| Gemini Blinds Ltd | Manufacturing | 2025 |
| Gibbyo Limited | Construction | 2016 |
| GKC & Co Properties Ltd | Construction | 2026 |
| Gkt-Foods Limited | Hospitality | 2017 |
| Glanavon Developments Ltd | Construction | 2016 |
| Glascoed Fishery Limited | Agriculture & fishing | 2015 |
| Glass Mountains Digital Ltd | Information & communication | 2001 |
| Glazy Susan Ltd | Manufacturing | 2025 |
| Glenalm Suns Ltd | Wholesale & retail | 2025 |
| Glickman Consultancy and Coaching Ltd | Professional & scientific | 2026 |
| Global Purchasing Solutions Limited | Professional & scientific | 2009 |
| Globe Properties SW Ltd | Construction | 2020 |
| GLP Teazer Ltd | Hospitality | 2024 |
| GNR Industrial Flooring Ltd | Construction | 2014 |
| Goldsmith Orchards Ltd | Wholesale & retail | 2025 |
| Good Girls Reading Club Ltd | Wholesale & retail | 2024 |
| Goshen Pet Care Limited | Professional & scientific | 2012 |
| Gower Construction & Enclosures Ltd | Construction | 2010 |
| Graft Group Ltd | Transport & logistics | 2026 |
| Grafton Harbours Ltd | Wholesale & retail | 2024 |
| Grai Matter Ltd | Manufacturing | 2014 |
| Graig-Ddu Wood Gundogs Limited | Agriculture & fishing | 2021 |
| Grassbond Limited | Manufacturing | 2013 |
| Grayle Crow Ltd | Wholesale & retail | 2025 |
| GRD Property Ltd | Real estate | 2020 |
| Green Borough (Alternative Investments) Ltd | Wholesale & retail | 2024 |
| Green Borough (Health & Fitness) Ltd | Arts & recreation | 2024 |
| Green Borough Holdings Ltd | Real estate | 2020 |
| Green Employ Ltd | Administrative & support | 2006 |
| Green Valley Care Limited | Health & social care | 2005 |
| Greenstones Property Limited | Real estate | 2012 |
| Greenway Wilton Ltd | Wholesale & retail | 2025 |
| Griffin Rentals Ltd | Real estate | 2025 |
| Griffiths & James CA Limited | Professional & scientific | 2010 |
| Griffithstown Extreme Clean CYF | Administrative & support | 2025 |
| Griffithstown Property Holdings Limited | Financial services | 2020 |
| GRILL&SPICE128 Ltd | Hospitality | 2026 |
| Groundform (UK) Limited | Construction | 2017 |
| Grounduplcg Ltd | Administrative & support | 2022 |
| Group Mind Technologies Ltd | Information & communication | 2018 |
| Groves Estates Group Ltd | Real estate | 2026 |
| Groves Estates Ltd | Real estate | 2024 |
| Growthlab Media Ltd | Information & communication | 2026 |
| Guest and Adam's Holdings Limited | Extraterritorial | 2022 |
| Gulbasi Aber Ltd | Hospitality | 2024 |
| Gusport Limited | Real estate | 2012 |
| GW & Sons Carpentry Ltd | Manufacturing | 2024 |
| GW & Sons Property Limited | Households | 2025 |
| Gwent Blast Ltd | Construction | 2023 |
| Gwent Cleaning Ltd | Administrative & support | 2017 |
| Gwent County Construction Ltd | Construction | 2018 |
| Gwent Developments Limited | Real estate | 2014 |
| Gwent Installations Ltd | Manufacturing | 2025 |
| Gwent Lime Ltd | Construction | 2014 |
| Gwent Local Medical Committee Limited | Other services | 2008 |
| Gwent Oven Cleaning Ltd | Administrative & support | 2022 |
| Gwent Vales Travel Limited | Transport & logistics | 2023 |
| Gwent Wildlife Trust Ltd | Arts & recreation | 1964 |
| Gwern Hafren Management Company Limited | Households | 2007 |
| GWP Wellbeing and Welfare Limited | Health & social care | 2021 |
| Gwrn Group Limited | Financial services | 2026 |
| H Johnson Roofer Limited | Construction | 2022 |
| H M Stores Limited | Wholesale & retail | 2017 |
| H-Ley Properties Limited | Real estate | 2025 |
| Ha-Rd Swansea Ltd | Other services | 2025 |
| Hadland Billing Ltd | Wholesale & retail | 2025 |
| Halo Beauty and Aesthetics Ltd | Other services | 2026 |
| Hamers VA Services Limited | Administrative & support | 2018 |
| Hammen Grouse Ltd | Wholesale & retail | 2022 |
| Handel Morris Ltd | Wholesale & retail | 2025 |
| Hannam System Development Limited | Information & communication | 2006 |
| Harbour Horizon Ltd | Wholesale & retail | 2025 |
| Harmony Environmental Ltd | Professional & scientific | 2022 |
| Harmony Halal Farm Ltd | Agriculture & fishing | 2024 |
| Hatch and Co Accountancy Limited | Professional & scientific | 2022 |
| Haycroft Harts Ltd | Wholesale & retail | 2025 |
| Haydn Powell B.C.D. Limited | Wholesale & retail | 1994 |
| HDZ Holdings Limited | Financial services | 2016 |
| HDZ Limited | Administrative & support | 2016 |
| Health Cloud Ltd | Wholesale & retail | 2011 |
| Healthy HR Consultancy Ltd | Administrative & support | 2019 |
| Heathgate Hasset Ltd | Wholesale & retail | 2025 |