| Genic Services Ltd | Manufacturing | 2024 |
| Genius YOU Ltd | Professional & scientific | 2004 |
| Genuine Business Consultancy Limited | Professional & scientific | 2025 |
| Geomatrix Ltd | Wholesale & retail | 2023 |
| George & George KBB Ltd | Construction | 2021 |
| George Brown's Implements (Holdings) Limited | Professional & scientific | 1968 |
| George Browns Limited | Wholesale & retail | 1938 |
| George Court Management Company Limited | Households | 1989 |
| George Trans Ltd | Transport & logistics | 2012 |
| George W Roberts & SON Limited | Wholesale & retail | 2020 |
| George Welch Heating Solutions Ltd | Manufacturing | 2018 |
| Georgina Venning Ltd | Professional & scientific | 2019 |
| GEP Works Limited | Administrative & support | 2025 |
| Gertech Limited | Information & communication | 2024 |
| Gestech Ltd | Manufacturing | 2021 |
| GET IT Shifted Limited | Transport & logistics | 2019 |
| GG Scaffolding Ltd | Construction | 2022 |
| GGC Limited | Professional & scientific | 1996 |
| GH Roofing Ltd | Construction | 2021 |
| Giant JIU Jitsu Ltd | Arts & recreation | 2026 |
| Giffnock Consulting Limited | Administrative & support | 2016 |
| Gigadev Limited | Information & communication | 2016 |
| Gilbert Inglefield Academy Trust | Education | 2011 |
| Ginger Gorilla Limited | Information & communication | 2023 |
| Ginger Technology Ltd | Information & communication | 2019 |
| Gini Ltd | Administrative & support | 2024 |
| Gisbaayi Limited | Health & social care | 2025 |
| GJ Building Solutions Ltd | Construction | 2024 |
| GJ UK Services Ltd | Other services | 2017 |
| GJ Whitbrook Limited | Information & communication | 2015 |
| GKC Electrics Limited | Construction | 2011 |
| Glass Haus Productions Limited | Information & communication | 2025 |
| Glen Conan Hydro Partnership LLP | | 2013 |
| Glen Dawson Consulting Services Ltd | Information & communication | 2022 |
| Glen Garage Group Limited | Wholesale & retail | 2002 |
| Glen Transport Services Limited | Transport & logistics | 1995 |
| Glenn Lewis Ltd | Arts & recreation | 2018 |
| Glenthorne Mews, Linslade, Management Company Limited | Real estate | 2009 |
| Glevum Nuclear Limited | Professional & scientific | 2020 |
| Global Kids Limited | Education | 2022 |
| Global Management Dynamix Limited | Administrative & support | 2013 |
| Global VLT Ltd | Financial services | 2025 |
| Globaldean Limited | Other services | 2016 |
| Globe Taxi Ltd | Transport & logistics | 2014 |
| Gloucester Project Management Limited | Professional & scientific | 2013 |
| Glow N Glow Ltd | Agriculture & fishing | 2019 |
| GMR Advisory Limited | Professional & scientific | 2024 |
| GMT Haulage Ltd | Transport & logistics | 2025 |
| Go to Insure Limited | Financial services | 2013 |
| GO2GUTTERS Ltd | Construction | 2020 |
| Goge Solutions Ltd | Construction | 2024 |
| Goians Associates Ltd | Information & communication | 2017 |
| Gold Rose Interiors Ltd | Administrative & support | 2016 |
| Goldace Industries Ltd | Manufacturing | 2003 |
| Golden Miller Court Residents Company Limited | Real estate | 1990 |
| Golden Rose Installation and Building Ltd | Construction | 2025 |
| Golden Tong Limited | Hospitality | 2017 |
| Golden Years Day Care Ltd | Health & social care | 2008 |
| Goldleaf Groundcare Limited | Administrative & support | 2008 |
| Goodearl Place Management Limited | Households | 2017 |
| Goodeehoo Limited | Wholesale & retail | 2020 |
| Goodwin Financial Services Limited | Financial services | 1992 |
| Goodwin Promotions Limited | Arts & recreation | 2009 |
| Gordon N Wood Limited | Administrative & support | 2015 |
| Gordon Property Investments Ltd | Real estate | 2023 |
| Gordon Winter (UK) Company Ltd | Professional & scientific | 2018 |
| Goshen Albion Ltd | Financial services | 2026 |
| Gossip Tanning Limited | Other services | 2019 |
| Governance and Equality Consultancy Services Ltd | Professional & scientific | 2021 |
| GP Developments Ltd | Construction | 2003 |
| GP Homes Limited | Construction | 2003 |
| GPE Scientific Limited | Manufacturing | 1962 |
| GPT Developments Limited | Construction | 2011 |
| Gpvwc Simracing Limited | Arts & recreation | 2018 |
| Gr-Tech Ltd | Wholesale & retail | 2018 |
| Grace Park Olney Management Limited | Households | 2018 |
| Gracious Hands Limited | Health & social care | 2006 |
| Graddient Pro Services Ltd | Information & communication | 2016 |
| Graham Wills & Trusts Ltd | Professional & scientific | 2019 |
| Grahily Ltd | Manufacturing | 2020 |
| Grand Central Management Company Limited | Households | 2006 |
| Grand Flèche Limited | Information & communication | 2023 |
| Grandone Consulting Ltd | Professional & scientific | 2025 |
| Grape.Vn PR Ltd | Professional & scientific | 2026 |
| Graphite Additive Manufacturing Limited | Manufacturing | 2012 |
| Graphite Engineering Limited | Professional & scientific | 2015 |
| Grays Commercials Northants Limited | Wholesale & retail | 2022 |
| Grayson & Vale Ltd | Information & communication | 2025 |
| Great Breath of Fire Limited | Professional & scientific | 2022 |
| Greek Mykonos Gyros Limited | Hospitality | 2025 |
| Green Heat Renewable Solutions Limited | Construction | 2012 |
| Green Hill Gate (High Wycombe) Management Company Limited | Households | 1976 |
| Green Learners Ltd | Education | 2024 |
| Green Lion Media Limited | Financial services | 2012 |
| Green Penny Limited | Administrative & support | 2012 |
| Green Property Developments Limited | Construction | 1990 |
| Green Vine Productions Ltd | Information & communication | 2022 |
| Greenhill (Tilsworth) Management Company Limited | Professional & scientific | 2014 |
| Greenhill Freeholds LLP | | 2010 |
| Greens Court Management Company (Woburn Sands) Limited | Households | 2016 |