| G Force Martial Arts Epsom Ltd | Education | 2024 |
| G Force Martial Arts Surrey Ltd | Education | 2022 |
| G J E Electrics Limited | Construction | 2007 |
| G T Plant Services Ltd | Manufacturing | 2003 |
| G&A Driver Ltd | Transport & logistics | 2019 |
| G&Rl Services Ltd | Professional & scientific | 2014 |
| G&S Graphic and Social Limited | Professional & scientific | 2023 |
| G-Bbrc Limited | Arts & recreation | 1991 |
| G-Bus Transport Limited | Transport & logistics | 2022 |
| G.A. Kemp Limited | Real estate | 2021 |
| G.A.Carder Limited | Hospitality | 2025 |
| G.B. Hill & Sons Limited | Construction | 2002 |
| G.B.J Great Bulk Journey Limited | Transport & logistics | 2025 |
| G.F.W. Irvin Limited | Real estate | 2013 |
| G.L Baker (Transport) Limited | Professional & scientific | 1971 |
| G.N Care Solutions Limited | Health & social care | 2021 |
| G.S.Lashmar Limited | Arts & recreation | 1946 |
| G20 Recovery Limited | Administrative & support | 2009 |
| Gablemount Limited | Other services | 1980 |
| Gaddu Management LLP | | 2024 |
| Gadget Genius Ltd | Wholesale & retail | 2025 |
| GAE Construction Ltd | Construction | 2023 |
| Gaffney Industrial & Welding Supplies Ltd | Extraterritorial | 1997 |
| Gafn 4R Ltd | Real estate | 2024 |
| Galaxy Electrical Services Ltd | Construction | 2019 |
| Galaxy Property Maintenance Ltd | Administrative & support | 2026 |
| Galaxy Trading Ltd | Administrative & support | 2012 |
| Gallic Consulting Limited | Professional & scientific | 2025 |
| Gama Cars Limited | Other services | 2013 |
| Gamatech Engineering Ltd | Professional & scientific | 2019 |
| Gamechamps Limited | Arts & recreation | 2025 |
| Games! Studio Ltd | Information & communication | 2025 |
| Gaming Existence Limited | Information & communication | 2024 |
| Gani Bazaar Limited | Wholesale & retail | 2024 |
| Ganova Consulting Limited | Information & communication | 2025 |
| Garden Imports UK Ltd | Wholesale & retail | 2020 |
| Gardenetics Limited | Other services | 1996 |
| Gareth FRY Ltd | Arts & recreation | 2015 |
| Garnet Finance Ltd | Financial services | 2021 |
| Garrad and Co Fragrance and Cosmetics Ltd | Manufacturing | 2024 |
| Garrafinhas Imports & Exports Ltd | Wholesale & retail | 2024 |
| Gary Bullen Ltd | Construction | 2010 |
| Gary Martin Limited | Other services | 2011 |
| GAS & Equipment Limited | Extraterritorial | 1980 |
| GAS & Gear Limited | Extraterritorial | 1998 |
| Gas-Proc Limited | Professional & scientific | 2019 |
| Gatcharoy Limited | Real estate | 2024 |
| Gate-A-Mation Services Limited | Construction | 2013 |
| Gateway Cars (Surrey) Ltd | Transport & logistics | 2020 |
| Gatsi Limited | Health & social care | 2021 |
| GB Candy Box Ltd | Wholesale & retail | 2018 |
| GB Leaders Ltd | Professional & scientific | 2024 |
| GBT Services Limited | Transport & logistics | 2026 |
| GC Sport Injury Limited | Health & social care | 2015 |
| GCH Services Limited | Administrative & support | 2023 |
| Gcoh Consulting Ltd | Professional & scientific | 2019 |
| Gcwabe Limited | Health & social care | 2022 |
| GDH Automations Ltd | Information & communication | 2024 |
| Gearbox Films Ltd | Professional & scientific | 2017 |
| GEE Technologies Ltd | Construction | 2025 |
| Geelong Innovation Limited | Professional & scientific | 2021 |
| Gembo Limited | Health & social care | 2012 |
| Gemh Holdings Ltd | Real estate | 2021 |
| Gemma Ltd | Wholesale & retail | 2024 |
| Gemsandbeauty Ltd | Wholesale & retail | 2025 |
| Genesis Construction Group Ltd | Construction | 2025 |
| Genesis House Freehold Limited | Households | 2002 |
| Genetest Ltd. | Professional & scientific | 2004 |
| Genh Services Ltd | Administrative & support | 2018 |
| Genius Finance Group Ltd | Financial services | 2025 |
| Genius Mortgages Ltd | Financial services | 2025 |
| Genixtech Ltd | Information & communication | 2023 |
| Gennile Ltd | Wholesale & retail | 2025 |
| Geobjects UK Projects Ltd | Information & communication | 2022 |
| Geobubble Limited | Information & communication | 2024 |
| Geogram Limited | Information & communication | 2020 |
| Geordie Store Ltd | Administrative & support | 2024 |
| George Irvin (Amusements) Ltd | Administrative & support | 2006 |
| Georgieva Ltd | Administrative & support | 2023 |
| Geovia Limited | Professional & scientific | 2004 |
| Gerald P.C. Watson Limited | Real estate | 2010 |
| Gettutored Network Ltd | Education | 2025 |
| Getzus Limited | Information & communication | 2025 |
| GFM Consultancy Ltd | Wholesale & retail | 2020 |
| Gg-Flame Building Services Ltd | Construction | 2021 |
| GG40 Limited | Households | 2026 |
| GH Arklow Ltd | Households | 2021 |
| Ghai Retails Ltd | Wholesale & retail | 2025 |
| Gharri Ltd | Wholesale & retail | 2022 |
| Gheorghe Ionut Ltd | Wholesale & retail | 2019 |
| Gherkin View Properties Ltd | Real estate | 2022 |
| Ghibss Homes Limited | Construction | 2011 |
| GHL Couriers and Transportation Ltd | Transport & logistics | 2025 |
| Gibbor Press Media Limited | Manufacturing | 2022 |
| Gifted LAB Ltd | Manufacturing | 2025 |
| Giga Ventures LLP | | 2018 |
| Gigagains Enterpeises Ltd | Wholesale & retail | 2025 |
| Gilead Psychological Associates Ltd | Transport & logistics | 2023 |
| Gilgamash LLP | | 2024 |
| Gillenden Development Company Limited | Construction | 1955 |