| Gigawatt Connections Ltd | Professional & scientific | 2025 |
| Giic International Limited | Real estate | 2022 |
| Gillick GAS & Electrical Services Limited | Construction | 2011 |
| Gillum and Partners Limited | Real estate | 2024 |
| Gilmour Care Group Limited | Financial services | 2020 |
| Ginger FOX Games Ltd | Wholesale & retail | 2015 |
| Ginkyo Asset Management Ltd | Administrative & support | 2021 |
| Ginos DZ Ltd | Other services | 2019 |
| Gizmo Networking Ltd | Information & communication | 2015 |
| GJD Brand Consultancy Ltd | Professional & scientific | 2021 |
| GJM Solutions Limited | Information & communication | 2012 |
| Gkcb Investments Ltd | Real estate | 2021 |
| GKS Advisory Ltd | Professional & scientific | 2022 |
| Glam Slam Limited | Arts & recreation | 2002 |
| Glendale House (Richmond) Limited | Households | 1981 |
| Glitterblossom Studio Ltd | Wholesale & retail | 2026 |
| Global Cuisine 2026 Limited | Hospitality | 2026 |
| Global HRM Limited | Information & communication | 2015 |
| Global MAC Solutions Ltd | Wholesale & retail | 2025 |
| Global Network Management Ltd | Professional & scientific | 2018 |
| Global Networks Management LLP | | 2018 |
| Global Podcast Festival Limited | Arts & recreation | 2021 |
| Global Scientific Business Solutions UK Ltd | Water & waste | 2020 |
| Globe Independent Financial Advisors Limited | Financial services | 1998 |
| GLS Telecams Limited | Information & communication | 2021 |
| GMA Architecture Limited | Professional & scientific | 1991 |
| GMA Property Development Ltd | Real estate | 2022 |
| GMF Care Ltd | Health & social care | 2023 |
| GMF Investment Properties Ltd | Real estate | 2025 |
| GMJ Property Renovations Ltd | Manufacturing | 2023 |
| GMK Food and Wine Ltd | Wholesale & retail | 2026 |
| GN Consultancy Limited | Professional & scientific | 2012 |
| Gndj Commercials Ltd | Real estate | 2023 |
| Gndj Investments Ltd | Real estate | 2016 |
| Gndj Limited | Wholesale & retail | 2018 |
| GNZ Fitness Limited | Arts & recreation | 2021 |
| Go Green BE Healthy Ltd | Health & social care | 2015 |
| Go HOP Limited | Transport & logistics | 2015 |
| GO2DISPOSALS Ltd | Water & waste | 2018 |
| GO2REMOVALS Limited | Transport & logistics | 2015 |
| Goat Team Ltd | Professional & scientific | 2019 |
| Gocuk Consultancy Services Ltd | Professional & scientific | 2026 |
| Godalming Fish Ltd | Wholesale & retail | 2016 |
| Godalmingvp Ltd | Professional & scientific | 2026 |
| Godwin Ltd | Arts & recreation | 2023 |
| Goemploy Limited | Administrative & support | 2016 |
| Goffs Oak Holdings Limited | Real estate | 2018 |
| Going Home Media Ltd | Information & communication | 2026 |
| Gokulam Consultancy Limited | Health & social care | 2014 |
| Gold Key Ventures Ltd | Real estate | 2025 |
| Gold Propertys Letting Ltd | Real estate | 2024 |
| Goldbridge Real Estate Limited | Real estate | 2018 |
| Golden Sky Advisory Limited | Professional & scientific | 2018 |
| Golders Hill Services Ltd | Hospitality | 2021 |
| Goldseal Roofing Ltd | Construction | 2022 |
| Goler Ltd | Manufacturing | 2015 |
| Golf@Work Limited | Arts & recreation | 2008 |
| Goltsblat Ltd | Professional & scientific | 2023 |
| Gordonmedia Limited | Information & communication | 2015 |
| Gorman Darby & Co Limited | Other services | 2006 |
| GOT YOU Covered Limited | Financial services | 2016 |
| Gourmet Productions Ltd | Manufacturing | 2025 |
| Gouveia Homes Ltd | Real estate | 2025 |
| Gozde Tabak Ltd | Health & social care | 2020 |
| Graben Parts UK Ltd | Wholesale & retail | 2018 |
| Grace Court (Twickenham) Management Company Limited | Households | 2025 |
| Grade 1 Hampton Limited | Other services | 2010 |
| Grade 1 Salon Limited | Other services | 2007 |
| Gradioniq Limited | Professional & scientific | 2016 |
| Grafgraf Limited | Financial services | 2025 |
| Grafton Flats Limited | Construction | 1957 |
| Grand Steward Capital Ltd | Financial services | 2025 |
| Granit One Ltd | Construction | 2021 |
| Graphene Star Trading Limited | Professional & scientific | 2019 |
| Grasshoppers Rugby Club Limited | Arts & recreation | 2005 |
| Grasshoppers Rugby Football Sports and Social Club Limited | Arts & recreation | 2010 |
| Grays of Twickenham Ltd | Wholesale & retail | 2018 |
| Grayson Wolf Ltd | Wholesale & retail | 2020 |
| Grayswandir Consulting Limited | Information & communication | 2012 |
| Great Britain Rugby Sevens Limited | Arts & recreation | 2015 |
| Great Britain Wheelchair Rugby Limited | Arts & recreation | 2007 |
| Greek Superb Ltd | Hospitality | 2024 |
| Green Ending Funerals Limited | Other services | 2023 |
| Green Endings Funerals Limited | Other services | 2003 |
| Green Heron Square Limited | Professional & scientific | 2010 |
| Green New Deal Group Limited | Professional & scientific | 2019 |
| Green Orchard Holdings Limited | Wholesale & retail | 2022 |
| Greencycle Tech UK Ltd | Water & waste | 2025 |
| Greendeck Technologies Limited | Professional & scientific | 2018 |
| Greenexperience Ltd | Other services | 2016 |
| Greenflow Consulting Ltd | Professional & scientific | 2025 |
| Greening Technical Services Ltd | Information & communication | 2025 |
| Greenspace TW1 Ltd | Arts & recreation | 2015 |
| Greenstones Apartments Ltd | Real estate | 2015 |
| Greenwich Atlantic Associates Limited | Administrative & support | 2012 |
| Greenyards Legal Limited | Professional & scientific | 2019 |
| Grendon Properties Limited | Real estate | 1984 |
| Grey Matters London Limited | Professional & scientific | 2016 |
| Griffin House Communications Limited | Information & communication | 2020 |
| Ground Down Ltd | Hospitality | 2021 |