| Glan Afan Properties Limited | Real estate | 2020 |
| Glanville Exterior Cleaning Ltd | Administrative & support | 2025 |
| Glasfryn House Limited | Health & social care | 2003 |
| Glebe Commercial Services Limited | Professional & scientific | 2016 |
| Glee Club UK Limited | Arts & recreation | 2010 |
| Glitz & Blitz Cleaning Services Ltd | Administrative & support | 2021 |
| Glitz&Blitz Facilities Management Ltd | Administrative & support | 2023 |
| Global Care Associates Ltd | Administrative & support | 2017 |
| Global Mindset Limited | Information & communication | 2020 |
| Global Online Selling Limited | Wholesale & retail | 2025 |
| Globul Security Services Ltd | Administrative & support | 2010 |
| Gloucester Railway Carriage & Wagon Company | Energy | 1942 |
| Gluten Freedom Bageri Ltd | Manufacturing | 2024 |
| Goal Associates Limited | Real estate | 2009 |
| Gobguard Ltd | Manufacturing | 2024 |
| Godfrey Healthcare Ltd | Health & social care | 2014 |
| Goji Foods Limited | Wholesale & retail | 2026 |
| Golap Ltd | Hospitality | 2025 |
| Goldabbey Caravan Parks Ltd | Wholesale & retail | 2016 |
| Golden Haka Ltd | Hospitality | 2023 |
| Gomaa Estates Ltd | Real estate | 2024 |
| Gomer Chauffeur Ltd | Transport & logistics | 2026 |
| Good Looking Richard Games Ltd | Manufacturing | 2021 |
| Good Nature Nutrition Ltd | Wholesale & retail | 2026 |
| Good With Waste Ltd | Water & waste | 2026 |
| Gosmar Property Ltd | Real estate | 2024 |
| Goswell House Limited | Hospitality | 2020 |
| Goto Car Ltd | Transport & logistics | 2024 |
| Gottalife Ltd | Information & communication | 2010 |
| Gould & Williams Engineers Limited | Manufacturing | 2014 |
| Govenders Homes Limited | Real estate | 2026 |
| Goyani Properties Ltd | Real estate | 2024 |
| GPF Landscapes Limited | Administrative & support | 2013 |
| GR Drylining Ltd | Construction | 2025 |
| GR Holdings London Ltd | Professional & scientific | 2018 |
| Grace Highways Ltd | Transport & logistics | 2025 |
| Grace Washington Ltd | Health & social care | 2019 |
| Gracious Grace Services Ltd | Administrative & support | 2019 |
| Graham Kirk Limited | Administrative & support | 2022 |
| Graham Steel Music Company Limited | Arts & recreation | 2014 |
| Grains & Marge Group Limited | Real estate | 2022 |
| Grand Marshal Ltd | Transport & logistics | 2025 |
| Grand Prix Investments Ltd | Real estate | 2019 |
| Grand Tour of Britain Limited | Administrative & support | 2015 |
| Grand Tour of Europe Limited | Administrative & support | 2011 |
| Grand Tour World (Asia) Limited | Administrative & support | 2022 |
| Grand Tour World (SRI Lanka) Limited Limited | Administrative & support | 2013 |
| Grandmasterofsecrets. Ltd | Arts & recreation | 2022 |
| Grandtourworld Limited | Administrative & support | 2016 |
| Grange Financial Services Ltd | Financial services | 2018 |
| Grange Financial Solutions Ltd | Financial services | 2011 |
| Granny Time Stories Ltd | Information & communication | 2025 |
| Graphene Consulting Limited | Construction | 2018 |
| Graphene Contracts Limited | Construction | 2022 |
| Graphic Express (U.K.) Limited | Manufacturing | 1992 |
| Greatmoor Farm Contracting Ltd | Agriculture & fishing | 2014 |
| Green Elmes Property Ltd | Real estate | 2020 |
| Green Energy Tech Limited | Construction | 2025 |
| Green Room Space Ltd | Information & communication | 2017 |
| Green Spark Electrical Services Ltd | Administrative & support | 2017 |
| Greennest Property Limited | Real estate | 2012 |
| Greenstone Literary Ltd | Information & communication | 2024 |
| Greenwood Realty Ltd | Real estate | 2023 |
| Gregg Hall Golf Club Ltd | Arts & recreation | 2025 |
| Greytech Engineering Ltd | Professional & scientific | 2026 |
| Griffith & Partners LLP | | 2020 |
| Griphaus Ltd. | Manufacturing | 2017 |
| Grolit Ltd | Construction | 2017 |
| Groom Haus Ltd | Other services | 2025 |
| Grooming by Sacha Ltd | Other services | 2025 |
| Grounded Future CIC | Hospitality | 2025 |
| Groveplus Limited | Professional & scientific | 2004 |
| Growing Seed Trust Foundation | Agriculture & fishing | 2021 |
| Growth Learning Limited | Professional & scientific | 2002 |
| Growth Method Limited | Information & communication | 2020 |
| Grram Limited | Real estate | 2017 |
| GRT Sussex Limited | Wholesale & retail | 2014 |
| GS Home Improvements Ltd | Construction | 2025 |
| GSJ IT Services Limited | Information & communication | 2018 |
| GT Motors Bracknell Ltd | Wholesale & retail | 2014 |
| GTM Communications Limited | Construction | 2015 |
| Gtrs Electrical Ltd | Construction | 2009 |
| Guani Properties Limited | Real estate | 2022 |
| Guard Logistics Consulting Ltd | Professional & scientific | 2019 |
| Guardian Hair Angels Limited | Wholesale & retail | 2021 |
| Gumbs Dental Nurse Agency Limited | Health & social care | 2023 |
| GW Collective Limited | Professional & scientific | 2025 |
| GWC Joinery and Design Limited | Construction | 2017 |
| Gyptiane Ltd | Professional & scientific | 2000 |
| GZB Ltd | Information & communication | 2008 |
| GZR Ltd | Extraterritorial | 2025 |
| H&A Holdings Group Ltd | Real estate | 2024 |
| H&F UK Solutions Ltd | Wholesale & retail | 2011 |
| H.U.S.H. Mind and Wellbeing Ltd | Health & social care | 2020 |
| H50 Ltd | Other services | 2022 |
| HA & FA Limited | Wholesale & retail | 2025 |
| Hair and Beauty Palace Ventures Limited | Wholesale & retail | 2018 |
| Halcyon Moments Limited | Other services | 2013 |
| Halka Danger Ramailo Bar Ltd | Wholesale & retail | 2024 |
| Hallcon Limited | Professional & scientific | 2024 |