| Gama Aviation (UK) Limited | Transport & logistics | 1983 |
| Gama Aviation PLC | Transport & logistics | 2010 |
| Gama Group Limited | Professional & scientific | 1993 |
| Gama Support Services Limited | Manufacturing | 1993 |
| Gandhi Pharma Ltd | Professional & scientific | 2018 |
| Garage Force Ltd | Construction | 2025 |
| Gardner Process Solutions Ltd | Professional & scientific | 2024 |
| Gareth J Consulting Ltd | Professional & scientific | 2022 |
| GATE8 Luggage Limited | Manufacturing | 1999 |
| Gateway Logix Ltd | Professional & scientific | 2024 |
| GD & Sons Building Contractors Ltd | Construction | 2011 |
| Gdevcamp CIC | Information & communication | 2025 |
| Gees Fleet Ltd | Hospitality | 2022 |
| Gemini GAS & Electrical Services Limited | Construction | 2018 |
| Gemini Studios Ltd | Arts & recreation | 2026 |
| GEN3 Systems Limited | Manufacturing | 2003 |
| Generics Foods Limited | Wholesale & retail | 2026 |
| Generics Solutions Limited | Information & communication | 2008 |
| Genesis International Solutions Ltd | Health & social care | 2012 |
| Genie Maintenance Ltd | Construction | 2024 |
| Genoxio Ltd | Information & communication | 2022 |
| Geobond (UK) Ltd | Construction | 2006 |
| Geogift Ltd | Health & social care | 2021 |
| George P & Co Ltd | Hospitality | 2017 |
| George Rapsomanikis Limited | Information & communication | 2014 |
| GET Fund Ltd | Financial services | 2025 |
| GET Lifted Scaffolding Ltd | Administrative & support | 2019 |
| GET Peachy Clean Ltd | Administrative & support | 2020 |
| GET UP and Go Bootcamps Ltd | Other services | 2024 |
| GH Home Cleaning Services Ltd | Administrative & support | 2021 |
| Gharelu Grocery Store Limited | Wholesale & retail | 2018 |
| Ghuman & Sons Limited | Transport & logistics | 2015 |
| GIA Taradevi Ltd | Real estate | 2025 |
| Giamo Limited | Manufacturing | 2026 |
| Gibberd Mary Residential Limited | Real estate | 2025 |
| Gibbs & Lear Limited | Real estate | 1985 |
| Ginbo Limited | Hospitality | 2022 |
| Ginger Velvet Ltd | Professional & scientific | 2019 |
| Giyarhween Ltd | Wholesale & retail | 2024 |
| Glas-Tek Limited | Construction | 2013 |
| Glass Inspirations Limited | Manufacturing | 2008 |
| Gliders Swimming Ltd | Education | 2022 |
| Glisk Naturals Ltd | Wholesale & retail | 2020 |
| GLM Logistics Ltd | Transport & logistics | 2019 |
| Global Computers Apex Limited | Other services | 2015 |
| Global Crown Ltd | Administrative & support | 2025 |
| Global IT Communications Limited | Information & communication | 2025 |
| Globalstep Ltd | Professional & scientific | 2018 |
| Glorious Gardens SON & Co Ltd | Administrative & support | 2025 |
| Go Go Taxi Ltd | Wholesale & retail | 2024 |
| Go Greek Cafe Ltd | Hospitality | 2024 |
| Go Ogle Healthy Rights Ltd | Health & social care | 2026 |
| Go to Digital UK Ltd | Information & communication | 2023 |
| Go Transport Ltd | Transport & logistics | 2009 |
| Goddard Fast Foods Limited | Hospitality | 2011 |
| Godsent Entertainment and Clothing Limited | Wholesale & retail | 2024 |
| Gohenry Family Finance Limited | Other services | 2020 |
| Gohenry Limited | Other services | 2007 |
| Gold Standard Scaffolding (Southern) Limited | Construction | 2024 |
| Gold Venom Tattoo Ltd | Other services | 2020 |
| Goldbeck Solar Limited | Manufacturing | 2014 |
| Golden Blade Ltd | Other services | 2024 |
| Golden Kebab House (Farnborough) Ltd | Hospitality | 2023 |
| Golden Manor Gardens Limited | Real estate | 2025 |
| Goldstream Investments Limited | Real estate | 2010 |
| Good Data Limited | Information & communication | 1986 |
| Good Good Good Cleaning Limited | Administrative & support | 2025 |
| Good Home Furnishers Limited | Wholesale & retail | 2005 |
| Goodwill and Hope Ltd | Health & social care | 2012 |
| Goodwin Lettings Ltd | Real estate | 2024 |
| Gorgeous Bikes Limited | Wholesale & retail | 1998 |
| Goulds Roofing Limited | Construction | 2021 |
| GP Sprint Ltd | Transport & logistics | 2025 |
| GR8 Project Management Solutions Ltd | Construction | 2019 |
| Grace Debt Advice | Other services | 2010 |
| Graciecleans Limited | Administrative & support | 2020 |
| Gradian Systems Ltd | Information & communication | 2001 |
| Graftone Ltd | Other services | 2025 |
| Grainger & Rossall Ltd | Construction | 2019 |
| Grand Touring Specialties Ltd | Wholesale & retail | 2026 |
| Grants Empire Ltd | Real estate | 2025 |
| Grassroot Sports Ltd | Arts & recreation | 2009 |
| Graviton Events Limited | Administrative & support | 2014 |
| Graviton Global Holdings Ltd | Administrative & support | 2015 |
| Grazeley Lodge Maintenance (1988) Limited | Administrative & support | 1988 |
| Greckon Associates Ltd | Professional & scientific | 2010 |
| Green Lion Management Limited | Professional & scientific | 2010 |
| Green Rehabilitation Limited | Professional & scientific | 2020 |
| Greenham Technical Sales Limited | Wholesale & retail | 2023 |
| Greenhouse Media Investment Limited | Information & communication | 2009 |
| Greenways Access Limited | Real estate | 2017 |
| Greenwhite Technology Ltd | Information & communication | 2019 |
| Greg James Limited | Real estate | 2014 |
| Grey Pepe Ltd | Professional & scientific | 2025 |
| Griffin Cardwell Holdings Limited | Financial services | 2014 |
| Griffin Cardwell Limited | Manufacturing | 2001 |
| Griffin Macleod Consultancy Limited | Real estate | 2008 |
| Grillbox Works Ltd | Manufacturing | 2024 |
| Grindhouse Ltd | Arts & recreation | 2025 |
| Grinergy Ltd | Construction | 2021 |