| Germination Technology Limited | Professional & scientific | 2015 |
| GFP Contracting Ltd | Professional & scientific | 2025 |
| GJ Training & Consultancy Limited | Professional & scientific | 2010 |
| Glenview (Chepstow) Ltd | Hospitality | 2022 |
| Glew Ltd | Hospitality | 2026 |
| Global Bullion Solutions Limited | Professional & scientific | 2023 |
| Gloucestershire GAS & Plumbing Ltd | Construction | 2021 |
| GM & RW Developments Limited | Extraterritorial | 2012 |
| Go Wild Education Ltd. | Education | 2013 |
| Gold Oak Property Investments Ltd | Real estate | 2022 |
| Goldcliffs Ltd | Real estate | 2021 |
| Golden Hill Farming Ltd | Agriculture & fishing | 2024 |
| Golfing Getaways Ltd | Administrative & support | 2024 |
| Goodfull Limited | Wholesale & retail | 2024 |
| Gordian Properties Limited | Real estate | 1986 |
| Gorilla Feet Ltd | Information & communication | 2024 |
| Gorse Wood Recruitment Limited | Administrative & support | 2024 |
| GPG Trading Limited | Hospitality | 2016 |
| GR Property Services LLP | | 2004 |
| Grace & Art Property Limited | Real estate | 2025 |
| Grace Harris Racing Limited | Agriculture & fishing | 2026 |
| Grapevine Networks Limited | Professional & scientific | 2009 |
| Gravitas MM Limited | Administrative & support | 2007 |
| Great Britain Precision Rifle Association CIC | Education | 2022 |
| Great House Farm (Sewerage) Management Limited | Households | 2006 |
| Great House Farm (Water & Drive) Management Limited | Households | 2006 |
| Great House Management Limited | Professional & scientific | 2009 |
| Green Edge Applications Ltd | Professional & scientific | 2018 |
| Green Rural Limited | Professional & scientific | 2008 |
| Greencape Estates Limited | Extraterritorial | 2005 |
| Greensmiths Properties Limited | Real estate | 2024 |
| Greenstreetgroup Ltd | Information & communication | 2026 |
| Groundology Limited | Wholesale & retail | 2012 |
| GT Services (Lydney) Ltd | Wholesale & retail | 2016 |
| Gtrips Ltd | Professional & scientific | 2023 |
| Gwalia Consulting Ltd | Information & communication | 2014 |
| GWC Media Ltd | Information & communication | 2008 |
| Gwent Energy CIC | Manufacturing | 2009 |
| Gwent Euro Park Management Company Limited | Construction | 1995 |
| Gwenyn Developments Ltd | Agriculture & fishing | 2014 |
| GWR Polymers Ltd | Wholesale & retail | 2011 |
| H & N Bounds Transport Limited | Transport & logistics | 1999 |
| H R T Properties Limited | Real estate | 2015 |
| H.J.Weir Engineering Company Limited | Manufacturing | 1961 |
| Haedler Services Limited | Health & social care | 2017 |
| Haines Fire and Security Ltd | Construction | 2025 |
| Hair Lounge (Chepstow) Ltd | Other services | 2018 |
| Hall & Bednarczyk Architects Limited | Professional & scientific | 2004 |
| Hanley Farm Shop Limited | Wholesale & retail | 2013 |
| Hard Reset Ltd | Information & communication | 2026 |
| Hardwick Contracting Limited | Agriculture & fishing | 2024 |
| Harmonia Herbals Limited | Agriculture & fishing | 2024 |
| Harris & Co Properties Limited | Construction | 2014 |
| Hatch Homes Accelerator Limited | Construction | 2016 |
| Haycass Engineering Services Limited | Real estate | 1983 |
| HCH Events Ltd | Professional & scientific | 2020 |
| Heart Felt Analytics Ltd | Information & communication | 2024 |
| Henith Limited | Hospitality | 2026 |
| Henrys Events Services Ltd | Hospitality | 2025 |
| Herf Yurts Limited | Administrative & support | 2015 |
| HH Change Solutions Ltd | Professional & scientific | 2025 |
| Hhfg Production Ltd | Professional & scientific | 2022 |
| Hhsf Limited | Hospitality | 2017 |
| Hi-Maintenance Ltd | Construction | 2009 |
| Hill Farm Tintern Limited | Hospitality | 2022 |
| Hippohop Events Ltd | Administrative & support | 2019 |
| Hire Some Help Limited | Construction | 2012 |
| Hive Products Ltd | Wholesale & retail | 2021 |
| Hockey Wealth Management Ltd | Professional & scientific | 2025 |
| HOI Interior Design Ltd | Professional & scientific | 2019 |
| Holiday Village Gower Limited | Hospitality | 2026 |
| Hollywood Nails (Chepstow) Limited | Other services | 2014 |
| Holme Rose Limited | Extraterritorial | 2011 |
| Home Farm Court Management (Wales) Limited | Households | 2005 |
| Horder Media Limited | Information & communication | 2009 |
| Horizon Wholesale Co Limited | Wholesale & retail | 2026 |
| Hornigold & Co Limited | Professional & scientific | 2024 |
| Hosanna's Highest Property Management Ltd | Hospitality | 2025 |
| Host Online Ltd | Wholesale & retail | 2022 |
| Hot Hydro Limited | Construction | 2025 |
| Hot TUB Revive Ltd | Manufacturing | 2023 |
| House and Home Sales Ltd | Real estate | 2020 |
| How-Po Leadership Limited | Professional & scientific | 2023 |
| Howells 2020 Limited | Construction | 2018 |
| Howells Estates Limited | Real estate | 2018 |
| Howells Farms Limited | Agriculture & fishing | 2016 |
| Howells Investments Limited | Professional & scientific | 2014 |
| Howgate Accounting Ltd | Professional & scientific | 2025 |
| Hublot Limited | Information & communication | 2003 |
| Huckle Homes Ltd | Real estate | 2020 |
| Humankind Ventures Ltd | Health & social care | 2014 |
| Humble by Nature Ltd | Agriculture & fishing | 2011 |
| Hummingbird L&D Limited | Administrative & support | 2017 |
| Hybrid 4X4 Generators Ltd | Administrative & support | 2021 |
| Hybrid Studio Ltd | Professional & scientific | 2011 |
| Hydros Survey Limited | Professional & scientific | 2020 |
| I P Engineering (USK) Ltd | Professional & scientific | 2025 |
| I.Q. Endoscopes Ltd | Manufacturing | 2015 |
| Ibañez & Co Limited | Wholesale & retail | 2021 |
| ICA Consultancy Ltd | Information & communication | 2017 |