| Gardening LK Ltd | Other services | 2015 |
| Gareth Beynon Ltd | Health & social care | 2003 |
| Garner Consultancy Services Ltd | Professional & scientific | 2016 |
| Garnham Capital Limited | Real estate | 2025 |
| Garvian Ltd | Administrative & support | 2017 |
| Gatecrown Properties Limited | Real estate | 2009 |
| Gatesource HR Ltd | Administrative & support | 2022 |
| Gatfield Systems Ltd | Manufacturing | 2020 |
| Gauchan Niwas Ltd | Real estate | 2023 |
| Gaux Consulting Limited | Administrative & support | 2021 |
| Gavin Baker Landscapes Limited | Administrative & support | 2008 |
| Gazerest Limited | Real estate | 1980 |
| GBB Ventures Ltd | Other services | 2023 |
| GBT London Ltd | Construction | 2015 |
| GC Wear Ltd | Wholesale & retail | 2026 |
| Gciconnect Limited | Information & communication | 2024 |
| GCS Estate Management Limited | Extraterritorial | 2015 |
| GEM Electrics Ltd | Construction | 2007 |
| Gemma Chambers Art Ltd | Arts & recreation | 2025 |
| GENER4TION Digital Ltd | Professional & scientific | 2023 |
| Generation Arts Ltd | Education | 2012 |
| Genesis Outsourcing Limited | Administrative & support | 2022 |
| Geniii Limited | Financial services | 2024 |
| Genruss Properties Limited | Real estate | 2025 |
| Gentle & Prestige Care Agency Ltd | Health & social care | 2026 |
| Geofansons Ltd | Wholesale & retail | 2025 |
| Geoflowers Limited | Wholesale & retail | 2026 |
| George Hayes Transport Ltd | Transport & logistics | 2020 |
| Gerl Developments Ltd | Construction | 2026 |
| GET the Punters in Ltd | Hospitality | 2025 |
| Getmapping GEO Limited | Professional & scientific | 1999 |
| Getmapping Limited | Professional & scientific | 1998 |
| GG-926-885 Limited | Real estate | 2023 |
| GHH Construction Ltd | Construction | 2024 |
| GHH Tiling Ltd | Construction | 2020 |
| Gibbs Gillespie Lettings Limited | Extraterritorial | 1996 |
| Gibbs Gillespie Sales Limited | Real estate | 2013 |
| Gibson Day Holdings Limited | Financial services | 2025 |
| Gifted Studio Ltd | Professional & scientific | 2012 |
| Giles Fullerton (East Anglia) Limited | Extraterritorial | 2003 |
| Ginc UK Limited | Wholesale & retail | 2002 |
| Girasole Limited | Transport & logistics | 2004 |
| Give IT the Beans Ltd | Wholesale & retail | 2015 |
| GJ Marketing Solutions Ltd | Professional & scientific | 2026 |
| GJP Autos Limited | Professional & scientific | 2010 |
| GJS (Hampshire) Ltd | Manufacturing | 2011 |
| GK Landscapes and Groundworks Ltd | Administrative & support | 2022 |
| GK Search Limited | Administrative & support | 2017 |
| Gkalym Holdings Ltd | Information & communication | 2026 |
| GKJ Consultancy Ltd | Professional & scientific | 2022 |
| Gladiator Tennis and Training Limited | Arts & recreation | 2013 |
| Glanmire Development Limited | Construction | 2017 |
| Glanmire Holdings Brackley Limited | Construction | 2026 |
| Glanmire Holdings Limited | Construction | 2024 |
| Glanmire Holdings South Woodham Ferres Limited | Real estate | 2026 |
| Glaze International Holding Ltd | Financial services | 2019 |
| GLB - Consumer Division Ltd | Wholesale & retail | 2016 |
| Glemar UK Ltd | Other services | 2019 |
| Glentromie Limited | Households | 1997 |
| Glint Learning Limited | Education | 2012 |
| Global Alliance for Research on Avian Diseases Limited | Professional & scientific | 2014 |
| Global Cybersecurity Ltd | Professional & scientific | 2021 |
| Global Luxury Beauty Ltd | Wholesale & retail | 2008 |
| Global Remote Consulting Limited | Professional & scientific | 2021 |
| Global Roof Repairs Ltd | Construction | 2024 |
| Global Sourcing Consulting Ltd | Professional & scientific | 2016 |
| Global Trip Diaries Ltd | Information & communication | 2026 |
| Globalancer UK Limited | Transport & logistics | 2019 |
| Globalhigh Limited | Information & communication | 2009 |
| Globerica Ltd | Professional & scientific | 2018 |
| Gloster Aircraft Limited | Extraterritorial | 1972 |
| Gloucester Road Partnership LLP | | 2019 |
| Glowthesis Limited | Health & social care | 2025 |
| GM Punjab Transport Ltd | Transport & logistics | 2022 |
| GMR Global Media Representatives Ltd | Professional & scientific | 2013 |
| Gmtea Properties Ltd | Real estate | 2024 |
| GMW Consultancy Limited | Professional & scientific | 2022 |
| Go for Doors Ltd | Arts & recreation | 2020 |
| Go With the Flow Design and Build Ltd | Construction | 2023 |
| GO4REPAIR Ltd | Wholesale & retail | 2016 |
| GOD Level Limited | Wholesale & retail | 2019 |
| Goddard & Grant Jewellers Limited | Wholesale & retail | 1981 |
| Goddess Level Limited | Professional & scientific | 2022 |
| Goel Consultancy Services Limited | Information & communication | 2013 |
| Goel Dental Holdings Limited | Health & social care | 2022 |
| Goel Estates Ltd | Real estate | 2026 |
| Goggin Ltd | Professional & scientific | 2013 |
| Going Green Renewables Limited | Construction | 2011 |
| Golden Circle Support Ltd | Administrative & support | 2026 |
| Golden Consultants Limited | Professional & scientific | 2016 |
| Golden Eagle Capital Limited | Professional & scientific | 2023 |
| Golden EGG Training Limited | Education | 2002 |
| Golden ERA Care Ltd | Health & social care | 2024 |
| Goldstar Distribution Limited | Administrative & support | 2006 |
| Goldsworthys Licensed Conveyancers Limited | Professional & scientific | 2022 |
| Golf Apartments at Richmond Park Title Limited | Professional & scientific | 1997 |
| Golfee Products Limited | Wholesale & retail | 1987 |
| Golfmajor Limited | Real estate | 1994 |
| Golive Cloud Consulting Limited | Information & communication | 2019 |
| GOO GOO Cosmetics Ltd | Wholesale & retail | 2015 |