| G V Property Services Ltd | Households | 2025 |
| G-Grip Shutter Ltd | Administrative & support | 2010 |
| G.H. Property Maintenance Limited | Administrative & support | 2004 |
| G24 Limited | Administrative & support | 2005 |
| G2G Education Ltd | Education | 2008 |
| GA Investment Ltd | Real estate | 2012 |
| GA Renovations Limited | Construction | 2020 |
| Gaap Properties Limited | Real estate | 2020 |
| GAC Worldwide Ltd. | Administrative & support | 1997 |
| Gainchoice Limited | Wholesale & retail | 1991 |
| Gainchoice Properties LLP | | 2018 |
| Galibier Strategic Advisors Ltd | Financial services | 2023 |
| Gallium Phase Limited | Professional & scientific | 2025 |
| Galvin Construction Services Limited | Construction | 2020 |
| Gamash Limited | Financial services | 2017 |
| GAP Electrics Ltd | Construction | 2025 |
| Gapfix Limited | Construction | 2003 |
| Gareth Barnes Cardiology Ltd | Health & social care | 2023 |
| Gary Property Investments Ltd | Real estate | 2014 |
| Gayhurst School Trust | Education | 1987 |
| GB Resin Contractors Limited | Construction | 2017 |
| GDF Building Services Limited | Other services | 2013 |
| GDG Real Estate Ltd | Real estate | 2021 |
| Geld Limited | Financial services | 2024 |
| Gems Building Property Ltd | Real estate | 2022 |
| Geoff Tunley Management Consultants Ltd. | Professional & scientific | 1991 |
| George Shanks Landscapes Limited | Other services | 2003 |
| Georghiou Property Enterprise Limited | Real estate | 2015 |
| Gerbera Limited | Professional & scientific | 2016 |
| Gerrards Cross ASC Ltd | Health & social care | 2023 |
| Gerrards Cross Auto Services Ltd | Wholesale & retail | 2023 |
| Gerrards Cross Beauty Ltd | Other services | 2018 |
| Gerrards Cross Community Services Ltd | Hospitality | 1991 |
| Gerrards Cross Conservation Group Limited | Other services | 2026 |
| Gerrards Cross Osteopaths Limited | Health & social care | 2013 |
| Gerrards Cross Squash Club Limited | Arts & recreation | 2008 |
| Gerrards House Limited | Real estate | 2016 |
| Gerry & Mills Wholesale & Retail Flooring Specialists Ltd | Professional & scientific | 2005 |
| GES Energy Consulting Limited | Professional & scientific | 2015 |
| GG Investment Holdings Ltd | Real estate | 2020 |
| GGM Contractors Ltd | Construction | 2014 |
| GGM Developments Ltd | Real estate | 2018 |
| GGM Lettings Ltd | Real estate | 2025 |
| Ggmac Properties Limited | Real estate | 2019 |
| Ghra Limited | Other services | 2015 |
| Giant Steps London Limited | Health & social care | 2023 |
| Giantland Films Ltd | Arts & recreation | 2016 |
| Gibson One Limited | Wholesale & retail | 2006 |
| Ginagonda Limited | Financial services | 2022 |
| Gingerwood Productions Limited | Information & communication | 2022 |
| GJB Lighting Services Ltd | Construction | 2013 |
| GKB Investments Ltd | Real estate | 2011 |
| Gladecrest Limited | Administrative & support | 2012 |
| Glamour (UK) Ltd | Wholesale & retail | 2001 |
| Glamour UK Property Investment Ltd | Real estate | 2014 |
| Glasgow Properties Ltd | Real estate | 2016 |
| Glasswick Holdings Limited | Financial services | 2017 |
| Glebe Court Care Limited | Health & social care | 2025 |
| Glenacre Properties Limited | Construction | 2024 |
| Global Apartment Advisors Ltd | Professional & scientific | 2017 |
| Global E-Sports Transfers Limited | Information & communication | 2026 |
| Global TEC Security Systems Limited | Administrative & support | 2002 |
| Global Village Limited | Information & communication | 1993 |
| Globe Enterprise Consultancy Ltd. | Information & communication | 2015 |
| Glock Enterprises Ltd | Information & communication | 2018 |
| Go Help Asia Limited | Real estate | 2018 |
| Go-Pods Ltd | Manufacturing | 2026 |
| Goat Risk Consulting Limited | Professional & scientific | 2021 |
| Goat Risk Solutions Limited | Information & communication | 2018 |
| Goba Clothing Ltd | Wholesale & retail | 2025 |
| Godin Tepe Limited | Wholesale & retail | 2018 |
| Going Places 1 Limited | Real estate | 2023 |
| Gold Hill (Bread House) Limited | Wholesale & retail | 1977 |
| Gold Hill Curry House Limited | Hospitality | 2023 |
| Gold Hill Holidays Limited | Arts & recreation | 2002 |
| Gold Sky Creative Ltd | Professional & scientific | 2020 |
| Gold Standard Lighting Ltd | Construction | 2021 |
| Golden West Leisure Limited | Hospitality | 2021 |
| Goni Property Services Ltd | Construction | 2003 |
| Good Things Coming Limited | Arts & recreation | 2023 |
| Goode Property Limited | Real estate | 2019 |
| Goodhall Investments Ltd | Real estate | 2021 |
| Goodliff Drinks Co Limited | Hospitality | 2016 |
| Goodspeed Studio Ltd | Information & communication | 2022 |
| Goodwin's Heating Ltd | Construction | 2017 |
| Goulden House 94 Limited | Real estate | 2015 |
| GR IT Systems Limited | Information & communication | 2015 |
| Grange Fields Maintenance Company Limited | Households | 1964 |
| Gravitar Limited | Wholesale & retail | 2001 |
| Graychurch Properties Ltd | Real estate | 2020 |
| Great Value Rentals Ltd | Real estate | 2021 |
| Greedies Ltd | Hospitality | 2025 |
| Green Clean Contracts Limited | Administrative & support | 2014 |
| Green Hollow (Buckinghamshire) Limited | Professional & scientific | 2012 |
| Green Hometown Limited | Real estate | 2015 |
| Green Machine Camden Limited | Wholesale & retail | 2020 |
| Green Machine Greenwich Limited | Wholesale & retail | 2020 |
| Green Machine Hackney Limited | Wholesale & retail | 2020 |
| Green Machine Haringey Limited | Wholesale & retail | 2020 |
| Green Machine London Ltd | Wholesale & retail | 2019 |