| GAS Energy Solutions Ltd | Construction | 2025 |
| GAS Pro Services Ltd | Construction | 2015 |
| GAS Repair Ltd | Energy | 2017 |
| Gastec Billericay Ltd | Construction | 2025 |
| Gatsby Jewellery Limited | Arts & recreation | 2014 |
| GAZ DA Barber Limited | Other services | 2006 |
| GB Fragrances Ltd | Wholesale & retail | 2023 |
| GB Utilities Ltd | Construction | 2020 |
| GC Lakemeadows Limited | Real estate | 2011 |
| Geek Hub Ltd | Wholesale & retail | 2024 |
| Gelato E Ciambella Ltd | Hospitality | 2025 |
| Geneco Power Solutions Ltd | Professional & scientific | 2022 |
| Generation 3 Interiors Ltd | Construction | 2009 |
| Generiss Care Group Limited | Administrative & support | 2025 |
| Genesis FM U.K. Ltd. | Administrative & support | 2017 |
| Genesis Solutions (London) Ltd | Administrative & support | 2023 |
| Gents Construction Group Ltd | Professional & scientific | 2022 |
| George Archie Properties Ltd | Real estate | 2025 |
| George Coker Surveying & Associates Limited | Professional & scientific | 2024 |
| George Liddard Boxer Limited | Arts & recreation | 2022 |
| George's Limited | Administrative & support | 1985 |
| Gerard Consulting Services Ltd | Hospitality | 2023 |
| Gerridge Limited | Real estate | 2011 |
| GET Completed Limited | Real estate | 2023 |
| GET Plumbing & Heating Services Ltd | Construction | 2022 |
| GG Media and Events Ltd | Professional & scientific | 2023 |
| GGS Developments Limited | Real estate | 2017 |
| GH Projects Ltd | Professional & scientific | 2026 |
| Gheb Limited | Financial services | 2024 |
| Gherkin Tech Ltd | Information & communication | 2016 |
| Gibbuilder Ltd | Construction | 2023 |
| Gidea Park Lawn Tennis Club | Arts & recreation | 2003 |
| GIFTS4UMEGASTORE Ltd | Wholesale & retail | 2023 |
| Gigtix Ltd | Administrative & support | 2012 |
| Giles Security Ltd. | Other services | 2003 |
| Gilmore-Dowds Limited | Wholesale & retail | 2013 |
| Gilt Edged Bathrooms Limited | Construction | 2020 |
| Giltan Consultancy Limited | Information & communication | 2022 |
| Ginger Bobby Limited | Health & social care | 2019 |
| Ginger Bobby Properties Limited | Real estate | 2021 |
| Ginger Catering Company Limited | Hospitality | 2016 |
| GJ Internal & Fit Outs Limited | Wholesale & retail | 2018 |
| GJC Business Consultants Limited | Professional & scientific | 2021 |
| GJL Consultancy Limited | Administrative & support | 2014 |
| GJM Property Management Ltd | Real estate | 2026 |
| GJS Homes Ltd | Real estate | 2016 |
| Gladman and Sons Limited | Construction | 2015 |
| Glamping in Tuscany Ltd | Hospitality | 2022 |
| Glass Designs and Splashbacks Ltd | Construction | 2018 |
| Glenngarry Limited | Manufacturing | 1983 |
| Global Enlightenment Limited | Real estate | 2022 |
| Global Mail Limited | Wholesale & retail | 2024 |
| Global Medical Education Ltd | Education | 2023 |
| Global Thermal Insulation Ltd | Construction | 2022 |
| Global Waterproofing Solutions Ltd | Construction | 2016 |
| Globaltahub Ltd | Administrative & support | 2024 |
| Glow House Studios Limited | Arts & recreation | 2026 |
| Glowrise Limited | Wholesale & retail | 2023 |
| GLS Homes Ltd | Construction | 2020 |
| GN Naessens Limited | Administrative & support | 2023 |
| Gnatty Ltd | Administrative & support | 2020 |
| Go Leisure Limited | Education | 2012 |
| Gobians Farm Limited | Construction | 2015 |
| Gobions Farm Estate (Billericay) Limited | Real estate | 2015 |
| Godbolts Limited | Construction | 2022 |
| Godiva Domestic Properties Limited | Real estate | 2023 |
| Godoroja Limited | Transport & logistics | 2023 |
| Gold Lunar Ltd | Wholesale & retail | 2020 |
| Goldcrest Holdings Limited | Administrative & support | 1981 |
| Goldfinch Developments (Cambridge) Limited | Construction | 2016 |
| Goldfinch Developments (Tunbridge Wells) Limited | Construction | 2016 |
| Goldfinch Developments Limited | Construction | 2016 |
| Goldreach Limited | | 1987 |
| Goldtek Services Ltd | Professional & scientific | 2018 |
| Golf Maintenance Limited | Administrative & support | 2024 |
| Good Call Property Management Limited | Professional & scientific | 2023 |
| Goodey Construction Company Limited | Construction | 2000 |
| Goodwood Parks Limited | Financial services | 2023 |
| Gooseberry Green Pre-School Ltd | Other services | 2026 |
| Gooseberry Green Pre-School Nursery Limited | Other services | 2008 |
| Grafik Architects Limited | Professional & scientific | 2001 |
| Graham Page Contracting Limited | Professional & scientific | 2014 |
| Graham RAE Technical Services Limited | Professional & scientific | 2010 |
| Grand Gardens Soft Landscaping Ltd. | Other services | 2017 |
| Grandiose Car Sales Limited | Wholesale & retail | 2015 |
| Grange Europe Limited | Wholesale & retail | 2003 |
| Granite Properties Essex Ltd | Real estate | 2021 |
| Grant Environmental Services Ltd. | Construction | 2007 |
| Graphic Impressions Agency Limited | Professional & scientific | 1999 |
| Graphite Installations Limited | Construction | 2015 |
| Gray Wealth Limited | Professional & scientific | 2016 |
| Grayam Press Holdings Limited | Professional & scientific | 2000 |
| Graybourne Construction Services Limited | Construction | 2010 |
| Great Burstead School House Limited | Construction | 2021 |
| Great Canney Vineyards Limited | Manufacturing | 2016 |
| Great Cowbridge Grange Farm Limited | Agriculture & fishing | 1961 |
| Great Deal Appliance Services Limited | Other services | 2010 |
| Greatti Ltd | Professional & scientific | 2021 |
| Green Brook Projects Limited | Administrative & support | 2021 |
| Green Gecko Energy Ltd | Professional & scientific | 2025 |