| G.E.G. Europe Investment Limited | Administrative & support | 2009 |
| G.P.S. Holdings (South East) Limited | Manufacturing | 2004 |
| G1 Express Limited | Wholesale & retail | 2025 |
| G2G Community CIC | Education | 2021 |
| G5 Enterprise Limited | Administrative & support | 2002 |
| GA Cleaning Ltd | Administrative & support | 2025 |
| GA Coaching and Development Limited | Financial services | 2022 |
| GA Professional Healthcare Limited | Administrative & support | 2017 |
| GA Sea Foods Limited | Wholesale & retail | 2021 |
| Gaap Business Services Limited | Professional & scientific | 2025 |
| GAB Cloud Services Ltd | Information & communication | 2019 |
| GAB Shoes International Ltd | Manufacturing | 2019 |
| Gabbs Bakes Ltd | Manufacturing | 2025 |
| Gabby Technology Services Ltd | Information & communication | 2015 |
| Gablux Limited | Hospitality | 2020 |
| Gabriel and Andreea Ltd | Wholesale & retail | 2016 |
| Gadebridge Enterprises Limited | Wholesale & retail | 2002 |
| Gadgets & Games Ltd | Wholesale & retail | 2009 |
| Gadgets and Gaming Limited | Wholesale & retail | 2004 |
| Gadgets Repair Centre Ltd | Wholesale & retail | 2019 |
| Gadgex Limited | Information & communication | 2019 |
| Gadsby Accounting & Consulting Ltd | Professional & scientific | 2014 |
| Gaff Limited | Information & communication | 2013 |
| Gaia London Brand Ltd | Wholesale & retail | 2024 |
| Gail Brindley Limited | Professional & scientific | 2015 |
| Gainsborough Court (One) Management Company Limited | Households | 1990 |
| Gainsborough Court Limited | Households | 2002 |
| Gainsborough Road Management Company Limited | Households | 2003 |
| Galata Tower Limited | Real estate | 2017 |
| Galaxy Electrical Ltd | Administrative & support | 2017 |
| Galaxy Food & Wine Limited | Manufacturing | 2013 |
| Galaxy Mobile London Ltd | Information & communication | 2020 |
| Galdans Ltd | Manufacturing | 2010 |
| Gale Farm Healthcare LLP | | 2012 |
| Galeeleo Ltd | Administrative & support | 2021 |
| Galiberti Limited | Professional & scientific | 2013 |
| Galitos Pizza and Grill Ltd | Hospitality | 2023 |
| Gall Zeidler Consultants - UK, Ltd | Professional & scientific | 2006 |
| Gallaxi Ltd | Manufacturing | 2024 |
| Galloways Property Limited | Real estate | 2004 |
| Galockwood Ltd | Manufacturing | 2022 |
| Galuchat & Associates Ltd | Professional & scientific | 2026 |
| Galuse Limited | Financial services | 2026 |
| Game Galaxy Ltd | Wholesale & retail | 2014 |
| GAME4U Ltd | Wholesale & retail | 2009 |
| Gameplanr Limited | Professional & scientific | 2025 |
| Gaming & Gadgets Limited | Wholesale & retail | 2008 |
| Ganapathy Ltd | Wholesale & retail | 2019 |
| Ganco (Holdings) Limited | Other services | 2013 |
| Ganco (MH) Limited | Construction | 2023 |
| Ganco Assets Limited | Financial services | 2015 |
| Ganco Investments Limited | Real estate | 2018 |
| Ganco Limited | Construction | 2003 |
| Ganco Property UK Limited | Real estate | 2015 |
| Ganco Trading Limited | Construction | 2018 |
| Gandlake House Limited | Real estate | 2022 |
| Ganesh Kerr Limited | Professional & scientific | 2023 |
| Gani & Co Limited | Real estate | 2014 |
| Gansport Ltd | Wholesale & retail | 2025 |
| GAP Scaffolding Croydon Ltd | Construction | 2014 |
| Garage 55 Group Limited | Administrative & support | 2025 |
| Garbaco Multi-Services Ltd | Administrative & support | 2022 |
| Garden Court Management (Gondar Gardens) Limited | Households | 1973 |
| Garden Stream Installations Limited | Administrative & support | 2021 |
| Garden Valley (Aylesham) Residents Management Company Limited | Households | 2015 |
| Gardenia Avenue Management Company Limited | Households | 2004 |
| Gardenia Property Holdings Ltd | Health & social care | 2023 |
| Gargano Media Ltd | Information & communication | 2022 |
| Garhigh (Southern) Limited | Construction | 1999 |
| Garhigh (Waterproofing) Limited | Construction | 2017 |
| Gark Medical Limited | Health & social care | 2014 |
| Garlock Properties Limited | Real estate | 2017 |
| Garner Close Brampton Management Company Limited | Households | 2011 |
| Garnet Developments Limited | Professional & scientific | 2020 |
| Garrett Boyce Ltd | Other services | 2015 |
| Garrett Fields (Tyldesley) Management Company Limited | Households | 2018 |
| Garrick Estate Limited | Households | 1994 |
| Garting Global Limited | Hospitality | 2016 |
| Garwood House (Cheltenham) Management Company Limited | Households | 2003 |
| Gary Beestone Limited | Arts & recreation | 2009 |
| GAS 2 Electrics Ltd | Energy | 2017 |
| GAS Planet Ltd. | Construction | 2012 |
| Gasmi Ltd | Hospitality | 2022 |
| Gastro Life Limited | Health & social care | 2025 |
| Gate Payroll Limited | Professional & scientific | 2003 |
| Gatehouse Management Company (Worsley) Limited | Households | 1997 |
| Gateway Hub Services Ltd | Wholesale & retail | 2026 |
| Gatewickai Limited | Transport & logistics | 2025 |
| Gatwick Chauffeur Ltd | Transport & logistics | 2025 |
| Gatwick HAJ and Umrah Ltd | Administrative & support | 2017 |
| Gaudick Place Limited | Households | 2004 |
| Gauri Shanker Limited | Wholesale & retail | 2012 |
| Gausan Limited | Other services | 2007 |
| GAV Services Limited | Construction | 2016 |
| Gayed Radiology Ltd | Health & social care | 2016 |
| Gayle Force Recruitment Ltd | Professional & scientific | 2015 |
| Gaynor Francis Limited | Professional & scientific | 2022 |
| Gayton Road Harrow Management Company Limited | Real estate | 2016 |
| Gaze Consultancy Services Limited | Information & communication | 2022 |
| Gazi Enterprises Limited | Wholesale & retail | 2026 |