| Garwood K9 Ltd | Administrative & support | 2019 |
| Gary Britton Photography Limited | Professional & scientific | 2015 |
| Gary J Hayes Limited | Hospitality | 2024 |
| Gary Lynch Carpentry Ltd | Construction | 2016 |
| Gatecrasher Media Ltd | Information & communication | 2011 |
| Gateje Ltd | Other services | 2015 |
| Gateway Desserts Ltd | Hospitality | 2022 |
| Gauss Surveys Ltd | Construction | 2019 |
| Gavin Worby Electrical Ltd | Construction | 2023 |
| GAY Limited | Administrative & support | 2018 |
| GB Building Contractors Limited | Construction | 2004 |
| GB Security Network Ltd | Administrative & support | 2024 |
| GB3 Sports Massage Limited | Health & social care | 2016 |
| GB4 Ltd | Real estate | 2022 |
| GBM Property Limited | Real estate | 2023 |
| GC Property Consultancy Ltd | Professional & scientific | 2026 |
| GC Remit Limited | Financial services | 2022 |
| GCC Future Limited | Financial services | 2024 |
| GCK Old Students` Association Limited | Other services | 2009 |
| Gdennis Services Limited | Wholesale & retail | 2016 |
| GDM Advertising Ltd | Professional & scientific | 2026 |
| Geek Bites Ltd | Hospitality | 2026 |
| Gelborov Ltd | Construction | 2015 |
| GEM Dentith Global Ltd | Professional & scientific | 2017 |
| GEM Glow London Limited | Wholesale & retail | 2023 |
| Gemima Limited | Administrative & support | 2022 |
| Gemma Bailey Limited | Professional & scientific | 2019 |
| General Deals Equipment Ltd | Wholesale & retail | 2025 |
| Generals Inventories Ltd | Wholesale & retail | 2024 |
| Genetiq Software (UK) Limited | Information & communication | 2004 |
| Gensearch UK Limited | Administrative & support | 2019 |
| Gentryx Ltd | Wholesale & retail | 2025 |
| George Bach Ltd | Construction | 2021 |
| George Local SEO Limited | Professional & scientific | 2025 |
| George Percy Ltd | Professional & scientific | 2025 |
| GER Y Nant Management Company Limited | Households | 2012 |
| German Trade Solutions Ltd | Wholesale & retail | 2014 |
| Gershiels (UK) Limited | Professional & scientific | 2025 |
| GET on Your Bike Limited | Wholesale & retail | 2024 |
| GET2BEE Ltd | Transport & logistics | 2026 |
| Getbuilt Ltd | Construction | 2019 |
| Getfix Ltd | Construction | 2014 |
| GF Investment Management Ltd | Extraterritorial | 2013 |
| GG - Gardening Ltd | Other services | 2006 |
| GG Comics Ltd | Arts & recreation | 2020 |
| GG Imports / Herts Division Ltd | Wholesale & retail | 2024 |
| GG SAC Homes Limited | Real estate | 2024 |
| GGF Contractors Ltd | Construction | 2020 |
| Ggsp (Glastonbury) Limited | Extraterritorial | 2018 |
| Ggsp (ST Clears) Limited | Extraterritorial | 2017 |
| Ggsp (Weston) Limited | Extraterritorial | 2024 |
| Ggsp (Wrexham) Limited | Extraterritorial | 2018 |
| GH Drylining Ltd | Construction | 2017 |
| Ghahremani Limited | Construction | 2019 |
| GHB Letting Management Ltd | Real estate | 2018 |
| Ghedamsi Ltd | Hospitality | 2018 |
| Ghep Ltd | Other services | 2025 |
| Gherman Fixing Ltd | Construction | 2007 |
| Ghostaldev Limited | Information & communication | 2022 |
| Giant Gecko Limited | Information & communication | 2018 |
| Gibbs Automotive Ltd | Extraterritorial | 2024 |
| Gibbs Group Ltd | Manufacturing | 2023 |
| Gicaa Services Ltd | Construction | 2024 |
| Gift Haven Ltd | Wholesale & retail | 2023 |
| Gigaspeed Communications Limited | Information & communication | 2010 |
| Gigi's Pasta Ltd | Wholesale & retail | 2023 |
| Gilbert Building Projects Limited | Construction | 2015 |
| Gilded Day Limited | Wholesale & retail | 2025 |
| Gill's Transport Heathrow Ltd | Transport & logistics | 2008 |
| Gillings Court (High Barnet) Limited | Households | 2000 |
| Gillissa Limited | Information & communication | 2004 |
| Gilmore Swords Ltd | Construction | 2007 |
| Ginger Dog Logistics Ltd | Transport & logistics | 2026 |
| Ginger Mafia Limited | Manufacturing | 2019 |
| Ginger Property Maintenance Ltd | Administrative & support | 2023 |
| Gingerdog Consulting Limited | Professional & scientific | 2021 |
| Giovanni the Plumber Ltd | Construction | 2019 |
| Gisa Care Services Limited | Public administration | 2022 |
| GJE Trading Ltd | Wholesale & retail | 2022 |
| GK Prime Solutions Limited | Construction | 2026 |
| GL Projects and Consulting Limited | Construction | 2004 |
| GL1 Property Limited | Real estate | 2017 |
| Glade Property Services Ltd | Construction | 2024 |
| Glades Holdings Limited | Financial services | 2021 |
| Glanville Consultants Limited | Professional & scientific | 1985 |
| Glanville Futures Limited | Professional & scientific | 2019 |
| Glanville Holding Limited | Professional & scientific | 2011 |
| Glass & Design Limited | Construction | 2015 |
| Glasshouse London Ltd | Administrative & support | 2024 |
| Glaston Compressor Services Limited | Manufacturing | 1979 |
| Glavan Ltd | Construction | 2025 |
| Glazebooks Limited | Professional & scientific | 2020 |
| Glebe Close 23031972 Limited | Extraterritorial | 2013 |
| Glebe House RTM Company Limited | Households | 2025 |
| Glen-Deer Beverages UK Ltd | Manufacturing | 2026 |
| Glenmore Kerry Ltd | Professional & scientific | 2023 |
| Glenridge Wifi and Solutions Limited | Information & communication | 2023 |
| Glenview Gardens Management Company Limited | Households | 1981 |
| Glenview Guests Properties Ltd | Households | 2025 |
| Glenview Residents Limited | Households | 2025 |