| G.C. Francis Limited | Wholesale & retail | 1990 |
| G.E. Harding and Sons Limited | Manufacturing | 1994 |
| G.E.M.S. Food | Hospitality | 2020 |
| G.Fletcher Plant Limited | Construction | 2013 |
| G.I. Build Ltd | Construction | 2022 |
| G.J.Johnson & Sons Limited | Wholesale & retail | 1954 |
| G.M.P Contractors Limited | Construction | 2024 |
| G.Moto Ltd | Manufacturing | 2026 |
| G.P. Garages Limited | Wholesale & retail | 2001 |
| G.P. Hollick Ltd | Professional & scientific | 1954 |
| G.P.Web Limited | Information & communication | 2022 |
| G.R. Millar Carpentry Ltd | Construction | 2016 |
| G.R.K. Electrical Services Limited | Construction | 2007 |
| G.S White Electrical Ltd. | Construction | 2018 |
| G1 Records Ltd | Manufacturing | 2005 |
| G1-PROPERTY Ltd | Real estate | 2016 |
| G6 Property Ltd | Real estate | 2024 |
| GA Delivery Team Ltd | Transport & logistics | 2019 |
| GA UK Group Ltd | Administrative & support | 2019 |
| GA Vitals Ltd | Manufacturing | 2022 |
| GAB Body Repairs Limited | Wholesale & retail | 2024 |
| GAB3 Limited | Construction | 2017 |
| Gaba Trading Ltd | Hospitality | 2024 |
| Gabatan Health Care Ltd | Health & social care | 2021 |
| Gabor Properties Ltd | Water & waste | 2019 |
| Gabriel & Stefan Creative Health Ltd | Health & social care | 2013 |
| Gabriel and Sons Removal Limited | Transport & logistics | 2025 |
| Gabriel Moise Construction Ltd | Construction | 2023 |
| Gabriel&Lucas Ltd | Transport & logistics | 2024 |
| Gabriellas Nails and Beauty Ltd | Other services | 2025 |
| Gabryelcico Limited | Transport & logistics | 2015 |
| Gaddwhite Ltd | Professional & scientific | 2024 |
| Gadesignz Ltd | Wholesale & retail | 2020 |
| Gadget Repair South Ltd | Other services | 2017 |
| Gadgets Joinery Limited | Construction | 2019 |
| Gadiel Ventures Limited | Real estate | 2023 |
| Gael Limited | Real estate | 2018 |
| Gaff Rigger Limited | Hospitality | 2019 |
| Gagatek Limited | Transport & logistics | 2012 |
| Gaia Acquisitions Limited | Construction | 2025 |
| Gaia Carbon Centre Limited | Administrative & support | 2023 |
| Gaill Marine Solutions Ltd | Professional & scientific | 2022 |
| Gainsbrooke Management Company Limited | Households | 2024 |
| Gaite (Engineering) Limited | Real estate | 1976 |
| GAK Southern Ltd | Administrative & support | 2020 |
| GAL Decorating Ltd | Construction | 2019 |
| Gala Dent Engineering Ltd | Health & social care | 2015 |
| Galacticon Limited | Professional & scientific | 2024 |
| Galatians Group Ltd | Wholesale & retail | 2026 |
| Galbraith Galleries Ltd | Wholesale & retail | 2022 |
| Gale Homes Limited | Construction | 2010 |
| Galent Recruitment Ltd | Administrative & support | 2022 |
| Galiscope Limited | Professional & scientific | 2021 |
| Gallery 68 Ltd | Wholesale & retail | 2019 |
| Gallery Grounds CIC | Wholesale & retail | 2025 |
| Gallery Properties Partnership LLP | | 2017 |
| Gallexia Limited | Information & communication | 2025 |
| Gallium Group Limited | Professional & scientific | 2026 |
| Gallowgate Property Group Limited | Real estate | 2023 |
| Galmoy Surveying Limited | Professional & scientific | 2000 |
| Galo Express Ltd | Transport & logistics | 2019 |
| Galos Piri Piri Limited | Hospitality | 2023 |
| Galphas CIC | Administrative & support | 2024 |
| Galxc Cooling Services Limited | Wholesale & retail | 2006 |
| Galxc Cooling Systems Limited | Manufacturing | 2018 |
| Galxc FM Services Ltd | Construction | 2006 |
| Galxc Rental Services Ltd | Energy | 2012 |
| Gaman Ltd | Transport & logistics | 2016 |
| Gamaserviceuk Limited | Wholesale & retail | 2025 |
| Gamban Ltd | Information & communication | 2017 |
| Game Bustas Limited | Administrative & support | 2021 |
| Game Finder Limited | Arts & recreation | 2023 |
| Game Network Ltd | Information & communication | 2009 |
| Game on Paws Ltd | Wholesale & retail | 2024 |
| Gamersfunstore LLP | | 2022 |
| Gammon Piercy & Gaiger LLP | | 2019 |
| GAN LAX Ltd | Information & communication | 2023 |
| Gander Holdings Ltd | Financial services | 2023 |
| Ganesha Retails Ltd | Wholesale & retail | 2023 |
| Gannon Construction Ltd | Construction | 2024 |
| Garage Autoservices Ltd | Wholesale & retail | 2025 |
| Garage NO 7 Limited | Administrative & support | 2018 |
| Garage Solutions (UK) Ltd | Wholesale & retail | 2011 |
| Garagiste Ltd | Professional & scientific | 2018 |
| Garbo's Hair Limited | Other services | 1999 |
| Garden Cuisine 4U Limited | Hospitality | 2020 |
| Garden Room Projects Ltd | Construction | 2022 |
| Gardeners Farm Barn Limited | Construction | 2023 |
| Gardening & Landscaping Ltd | Administrative & support | 2025 |
| Gardens Catering Ltd | Wholesale & retail | 2025 |
| Gardens Foods Ltd | Wholesale & retail | 2025 |
| Gardiner Brothers Ltd | Construction | 2025 |
| Gardner Write Limited | Professional & scientific | 2026 |
| Gareth Harper Associates Limited | Health & social care | 2000 |
| Garmin (Europe) Limited | Wholesale & retail | 1992 |
| Garnet Solutions Ltd | Hospitality | 2026 |
| Garratt Technology Ltd | Professional & scientific | 2025 |
| Garsy Group Ltd | Wholesale & retail | 2025 |
| Garthowen Garden Centre Limited | Wholesale & retail | 1993 |
| Garthowen Holdings Limited | Financial services | 2013 |