| Ground Careers Ltd | Administrative & support | 2018 |
| Ground Recycling Limited | Construction | 2013 |
| Groundcop Projects Ltd | Construction | 2024 |
| Groundfix Ltd | Construction | 2026 |
| Group Tyre Wholesale Limited | Wholesale & retail | 2010 |
| Grove Enterprise London Limited | Administrative & support | 2019 |
| Grove Farm Livestock Limited | Extraterritorial | 2008 |
| Grove Glazing and Frame Fixing Ltd | Construction | 2024 |
| Grovebury Estate Management Limited | Real estate | 2016 |
| Grovelands (Grendon Underwood) Management Company Limited | Households | 1999 |
| Groveway Farm Limited | Real estate | 2023 |
| Growth Driven Marketing Limited | Information & communication | 2019 |
| Growthwise Ltd | Real estate | 2021 |
| Growva Limited | Professional & scientific | 2012 |
| Gryon Consulting Limited | Professional & scientific | 2005 |
| GSB Plumbing & Heating Limited | Construction | 2011 |
| Gspr Consultants Ltd | Information & communication | 2018 |
| GSV Hand Car Wash Ltd | Administrative & support | 2023 |
| Gswp Ltd | Construction | 2022 |
| GT Business Solutions Ltd | Information & communication | 2006 |
| GT Sunrise Properties Ltd | Real estate | 2020 |
| GTC Aylesbury Limited | Real estate | 2017 |
| Gtechno Ltd | Administrative & support | 2012 |
| Guelder Rose Livery Limited | Arts & recreation | 2017 |
| Guerci Services Limited | Construction | 2025 |
| Guernsey Gold Limited | Hospitality | 2017 |
| Gueyedi BC Limited | Health & social care | 2018 |
| Guilded Goomba Ltd | Wholesale & retail | 2025 |
| Gullane Residential Ltd | Real estate | 2016 |
| Gulmedicare (UK) Ltd | Health & social care | 2017 |
| Gumboots and Roots Pre-School Limited | Health & social care | 2019 |
| Gunman 1956 Limited | Extraterritorial | 2014 |
| Gunn BTL Limited | Real estate | 2022 |
| Guno Development Limited | Real estate | 2019 |
| Guru Ppty Limited | Real estate | 2025 |
| Gutters Plus Limited | Administrative & support | 2024 |
| Guyana-Business.Com Ltd | Administrative & support | 2024 |
| GVS Aylesbury Limited | Wholesale & retail | 2022 |
| Gwcs Ltd. | Information & communication | 1989 |
| GWT Insight Limited | Manufacturing | 2017 |
| Gwti Services Limited | Financial services | 2025 |
| GXH Contractors Limited | Construction | 2008 |
| GYM365 Ltd | Arts & recreation | 2026 |
| H & E Project Management Limited | Construction | 2013 |
| H a Accountancy Services Ltd | Professional & scientific | 2022 |
| H a Goddard & Sons Limited | Professional & scientific | 2010 |
| H Galore Limited | Other services | 2026 |
| H&C Labs Advisory Limited | Professional & scientific | 2026 |
| H&G Corporation Ltd | Transport & logistics | 2011 |
| H&H Bucks Healthcare Limited | Other services | 2023 |
| H&N Luxury Transportation Ltd | Transport & logistics | 2026 |
| H&R Medics Limited | Health & social care | 2014 |
| H7 Solutions Ltd | Professional & scientific | 2024 |
| Habibs Asset Limited | Real estate | 2021 |
| Habibs Enterprise Ltd | Hospitality | 2015 |
| Haddenham Carpets Limited | Wholesale & retail | 2002 |
| Haddenham Community Library | Arts & recreation | 2012 |
| Haddenham Waste and Recycling Limited | Water & waste | 2026 |
| Haddington Bakers Ltd | Manufacturing | 2025 |
| Hadi & Sons Travel Ltd | Transport & logistics | 2022 |
| Hadleigh Court Residents Association Limited | Households | 1978 |
| Hair Avenue (MF) Ltd | Other services | 2012 |
| Hair Avenue Ltd | Other services | 2012 |
| Hair by Kelly Ltd | Other services | 2021 |
| Hair Confident Ltd | Wholesale & retail | 2022 |
| Hair Veda Ltd | Administrative & support | 2022 |
| Haircuts & Uppercuts Ltd | Wholesale & retail | 2023 |
| Hajrah Holdings Ltd | Health & social care | 2026 |
| Haland Limited | Information & communication | 2023 |
| Halcyon Mead Homes Limited | Real estate | 2025 |
| Halda UK Limited | Transport & logistics | 2019 |
| Hallian Solutions Ltd | Wholesale & retail | 2024 |
| Halls Cars Chauffeur Service Limited | Transport & logistics | 2024 |
| Halls Creations Limited | Construction | 2024 |
| Halls Landscaping and Property Maintenance Limited | Administrative & support | 2022 |
| Halo Playgrounds Ltd | Construction | 2025 |
| Halogen Media Limited | Information & communication | 2014 |
| Halton Barns Management Company Limited | Professional & scientific | 1993 |
| Halton Technical Publications Ltd | Professional & scientific | 2005 |
| Halton Tennis Centre | Arts & recreation | 2006 |
| Halwick Property Limited | Real estate | 2019 |
| Halz Store Ltd | Wholesale & retail | 2024 |
| Hamdh Consultancy Limited | Information & communication | 2014 |
| Hamer Services Ltd | Information & communication | 2022 |
| Hamer Warren Bess Limited | Construction | 2022 |
| Hamer Warren Solar Limited | Construction | 2022 |
| Hamiga Limited | Real estate | 2022 |
| Hamilton Private Clients Limited | Real estate | 2013 |
| Hamilton View Management Limited | Households | 2013 |
| Hamiltonians Limited | Administrative & support | 2020 |
| Hammon Estates Limited | Real estate | 2007 |
| Hamnett (Wendover) Limited | Real estate | 2006 |
| Hamnetts Limited | Professional & scientific | 2006 |
| Hampden Financial Services Limited | Financial services | 2012 |
| Hampden Groceries & Halal Butchers Limited | Wholesale & retail | 2024 |
| Hamxa & Co Ltd | Wholesale & retail | 2025 |
| Hanchett END (Phase 2) Residents Management Company (NO.2) Limited | Households | 2010 |
| Handcraft Baits Limited | Wholesale & retail | 2021 |
| Handmade Hideaways Limited | Construction | 2020 |
| Handy Haynes 5 Limited | Construction | 2018 |