| GAMMONS192 Ltd | Real estate | 2026 |
| Gamtech Electronics Ltd | Manufacturing | 2020 |
| Gandhi Global Ventures Limited | Professional & scientific | 2011 |
| GAP Plastering Limited | Construction | 2011 |
| Gaph Limited | Wholesale & retail | 2015 |
| Garden Design Store Ltd | Administrative & support | 2024 |
| Garden Gurus Landscaping Ltd | Other services | 2023 |
| Garden Lovers Ltd | Administrative & support | 2021 |
| Gareth Llewellyn Sound Ltd | Information & communication | 2016 |
| Garfield Residential Management Company Limited | Households | 2019 |
| Garg Investments LLP | | 2024 |
| Garland Court (London Colney) Limited | Households | 1981 |
| Garmh Ltd | Information & communication | 2023 |
| Garmz Inc Ltd | Wholesale & retail | 2026 |
| Garnet Ventures Ltd | Wholesale & retail | 2024 |
| Garnett Property Company Limited | Real estate | 2026 |
| Garp Investments Ltd | Real estate | 2021 |
| Garston Barbers Ltd | Other services | 2025 |
| Garston Properties Ltd | Real estate | 2020 |
| Garston Scaffolding Ltd | Construction | 2025 |
| Garwood Homes Ltd | Real estate | 2024 |
| Gary Pitt & Co Limited | Professional & scientific | 2003 |
| Gary Wong Limited | Professional & scientific | 2022 |
| Gary's Land Limited | Construction | 2019 |
| GAS & Plumb Services Ltd | Construction | 2022 |
| GAS Eco Heat Ltd | Construction | 2026 |
| GAS Fast Limited | Construction | 2006 |
| GAS MAN DEN Ltd | Construction | 2019 |
| GAS Stuff Solutions Ltd | Construction | 2026 |
| GAS Tech Heating Limited | Construction | 2016 |
| Gasral Ltd | Real estate | 2021 |
| Gaston Plumbing Ltd | Construction | 2023 |
| Gatherley Ltd | Professional & scientific | 2015 |
| Gatt's Construction Ltd | Construction | 2025 |
| Gatt's Consultancy Ltd | Professional & scientific | 2025 |
| Gatti's Owners' Company Limited | Real estate | 2006 |
| Gauci.It Ltd | Information & communication | 2019 |
| Gava MAR Ltd | Professional & scientific | 2018 |
| Gavaziuc Ltd | Transport & logistics | 2016 |
| Gavin Brown Group Limited | Water & waste | 2025 |
| Gavin Jackson Limited | Professional & scientific | 2024 |
| Gavison Private Limited | Financial services | 2016 |
| Gavroofing Limited | Other services | 2015 |
| Gazmuddy Lettings Limited | Real estate | 2022 |
| GB Brands Europe Limited | Wholesale & retail | 2024 |
| GB International Trading Limited | Wholesale & retail | 2020 |
| GB Perfect Limited | Hospitality | 2022 |
| GB Personals Ltd | Wholesale & retail | 2023 |
| GBI Mechanical Services Ltd | Construction | 2015 |
| GBS 1972 Limited | Administrative & support | 2024 |
| GC Birtoc Tiling Ltd | Construction | 2025 |
| GCB Overseas UK Limited | Administrative & support | 2017 |
| Gcucch Tech Ltd | Information & communication | 2013 |
| GD Richard Construction Ltd | Construction | 2018 |
| GD Vent Ltd | Construction | 2024 |
| Gdan Instal Ltd | Construction | 2015 |
| GDS Technical Consulting Ltd | Professional & scientific | 2014 |
| Gdspl Limited | Manufacturing | 2019 |
| GE Advisory Ltd | Professional & scientific | 2017 |
| GEAR4SPORT Limited | Wholesale & retail | 2022 |
| Gedh Contractors Ltd | Professional & scientific | 2025 |
| Geekboy Advisors Limited | Professional & scientific | 2014 |
| Geeky Properties Limited | Real estate | 2021 |
| Geethi Salon & Spa Limited | Other services | 2025 |
| Gekz Limited | Real estate | 2023 |
| GEM Horse Retirement Home Limited | Agriculture & fishing | 2022 |
| GEM Starts HR Ltd | Wholesale & retail | 2026 |
| GEM Tree Management Ltd | Administrative & support | 2018 |
| Gemech Engineering Group Limited | Construction | 2018 |
| Gemech Engineering Limited | Construction | 2015 |
| Gemini Education Consultancy Limited | Education | 2011 |
| Gemini Interiors Limited | Extraterritorial | 2011 |
| Gemini Project Consultants Limited | Construction | 2007 |
| Gemini Properties and Relocations Limited | Construction | 2019 |
| Gemrock Property Services Ltd | Administrative & support | 2023 |
| Gemzstarz Ltd | Real estate | 2021 |
| Gencure Pharma Ltd | Professional & scientific | 2024 |
| General Building Construction Limited | Construction | 2015 |
| General Building UK Ltd | Construction | 2007 |
| General Cars Limited | Wholesale & retail | 2010 |
| General Domestic Appliances International Limited | Extraterritorial | 1962 |
| General Fire Protection Ltd | Public administration | 2023 |
| General Handyman Services Ltd | Construction | 2021 |
| General Land and Trading Company Limited | Real estate | 1984 |
| General Robots Limited | Information & communication | 2005 |
| General Spraying Ltd | Construction | 2019 |
| General Stoxx Ltd | Wholesale & retail | 2025 |
| Generalsoft Limited | Information & communication | 2001 |
| Generation Z London Ltd | Wholesale & retail | 2022 |
| Generous Beacon Ltd | Information & communication | 2023 |
| Genesis Key Construction Ltd | Construction | 2022 |
| Genesis Smiles Centre LLP | | 2015 |
| Genesis Wise Construction Ltd | Construction | 2025 |
| Genetos Ltd | Professional & scientific | 2017 |
| Geneva Consulting Solutions Limited | Professional & scientific | 2026 |
| Genie International Limited | Administrative & support | 2000 |
| Genius Digital Ltd | Information & communication | 2018 |
| Genius Junction Ltd | Information & communication | 2016 |
| Genny and Electrical Services Limited | Construction | 2016 |
| Genora Partners Limited | Administrative & support | 2025 |