| Fuel Digital Studios Ltd | Information & communication | 2018 |
| Fuel Financial Management Ltd | Professional & scientific | 2017 |
| Fulflo Consulting Limited | Administrative & support | 2018 |
| Full Bloom Films Limited | Professional & scientific | 2019 |
| Full Moon Consulting Ltd | Information & communication | 2025 |
| Fullandby Consulting Limited | Professional & scientific | 2024 |
| Fulwell Flats Freehold Limited | Households | 2023 |
| Function Flow Solutions Limited | Information & communication | 2025 |
| Future Road Ltd | Professional & scientific | 2024 |
| G and E Services (UK) Limited | Professional & scientific | 2005 |
| G Caldwell Consulting Limited | Information & communication | 2023 |
| G Smart Management Ltd | Real estate | 2018 |
| Gadget Universe Ltd | Wholesale & retail | 2013 |
| GAJ Surveys Limited | Professional & scientific | 2019 |
| Galadrium Limited | Information & communication | 2011 |
| Gallery Faerie Ltd | Wholesale & retail | 2020 |
| Gama-Soft Limited | Information & communication | 2007 |
| Gardencraft Surrey Limited | Administrative & support | 2020 |
| Garfield Road Management Limited | Households | 2005 |
| Garrick Mews Management Company Limited | Real estate | 2005 |
| Gatsby Enterprises Ltd | Real estate | 2015 |
| GBM Heating, Plumbing & GAS Engineers Ltd | Construction | 2007 |
| GBT Projects Ltd | Construction | 2022 |
| GC Communications Ltd | Professional & scientific | 2021 |
| Gcdt Ltd | Hospitality | 2019 |
| GDS Property Management Limited | Real estate | 2019 |
| Gencap Assets Limited | Real estate | 2026 |
| General Council and Register of Consultant Herbalists Limited (the) | Education | 1960 |
| Generation Social Ltd | Professional & scientific | 2019 |
| Geneva Developments Limited | Administrative & support | 1997 |
| Geneva Property Holdings Ltd | Real estate | 2017 |
| Geometry Limited | Information & communication | 2014 |
| Geopolitical Artificial Intelligence Laboratories Ltd | Professional & scientific | 2025 |
| GG Gardening Services Ltd | Construction | 2025 |
| Ghost Chant Productions Limited | Arts & recreation | 2013 |
| Gi&Gi Building Contractor Ltd | Construction | 2013 |
| Gibson Park Learning Limited | Professional & scientific | 2022 |
| Gillian Million Ltd | Wholesale & retail | 2010 |
| Ginception Software Ltd | Information & communication | 2012 |
| Girvan Resources UK Limited | Professional & scientific | 2023 |
| Gitsvalley Ltd | Information & communication | 2024 |
| GJ Joinery & Building Services Ltd | Construction | 2014 |
| GL London Ltd | Wholesale & retail | 2025 |
| Glance Gallery Ltd | Professional & scientific | 2022 |
| GLD Service Construction Ltd | Construction | 2024 |
| Glenthorne Estates Limited | Real estate | 2017 |
| Glenthorpe Engineering Company Limited | Manufacturing | 1962 |
| Glentrees Property Ltd | Real estate | 2021 |
| Gloac Ltd | Real estate | 2022 |
| Global Index Investing Limited | Financial services | 2017 |
| Global Technical Resource Solutions Ltd | Professional & scientific | 2016 |
| Global Think Tank of Innovation and Development Ltd | Professional & scientific | 2025 |
| Global Youth Leadership Limited | Professional & scientific | 2025 |
| Glow Maintenance Limited | Construction | 2005 |
| GN Interiors UK Ltd | Construction | 2018 |
| GN Refurbishment Ltd | Construction | 2006 |
| Go 2 OB Ltd | Information & communication | 2014 |
| Go Forth Films Limited | Information & communication | 2019 |
| Golden Helix Ltd | Financial services | 2025 |
| Goodweave UK | Professional & scientific | 2001 |
| Gorania Consulting Ltd | Information & communication | 2019 |
| Gorix Homes Ltd | Construction | 2025 |
| Grace Automotive Limited | Wholesale & retail | 2018 |
| Grace Molony Limited | Arts & recreation | 2022 |
| Grad-Concept-Uk Ltd | Wholesale & retail | 2022 |
| Grad-Uk Ltd | Wholesale & retail | 2022 |
| Grad-Uk-Concept Ltd | Wholesale & retail | 2022 |
| Gradpads Limited | Real estate | 2018 |
| Grafikui Ltd | Professional & scientific | 2025 |
| Graham Hughes Photographer Limited | Professional & scientific | 2012 |
| Gravytrain Digital Ltd | Information & communication | 2021 |
| Gravytrain Group Limited | Financial services | 2022 |
| Grays Accountants (Teddington) Limited | Professional & scientific | 2002 |
| Grays Accountants Limited | Professional & scientific | 2012 |
| Green CU3ED Architectural Solutions Ltd | Professional & scientific | 2017 |
| Green River Living Limited | Professional & scientific | 2010 |
| Greenoaks Farm Care Limited | Health & social care | 2008 |
| Greenway MSK Healthcare Limited | Health & social care | 2024 |
| Gregory Walker Associates Ltd | Administrative & support | 2024 |
| Grindlay Estates Limited | Construction | 1982 |
| Grosvenor House (Sutton) Management Company Limited | Households | 2002 |
| Grove Residential Sales Limited | Real estate | 2015 |
| Growthspring Ltd | Professional & scientific | 2025 |
| GSC Property Group Limited | Real estate | 2019 |
| GSC SYS Ltd | Wholesale & retail | 2022 |
| GSM Capital Ltd | Real estate | 2021 |
| Gtm-Ex Ltd | Professional & scientific | 2020 |
| Gtrs Inspect Ltd | Professional & scientific | 2019 |
| Guru Business Ltd | Professional & scientific | 2021 |
| GUY Lambert Productions Limited | Information & communication | 2006 |
| Gymshack Two Ltd | Arts & recreation | 2023 |
| GZB Design & Furniture Ltd | Manufacturing | 2012 |
| H & B Merchant Ltd | Wholesale & retail | 2014 |
| H&K England Ltd | Construction | 2020 |
| H&Pce Limited | Extraterritorial | 2008 |
| H.L.Wooding & Co.Limited | Wholesale & retail | 1962 |
| Hairfix Limited | Manufacturing | 2001 |
| Half Backs Sport Limited | Arts & recreation | 2016 |
| Halfsmart Limited | Households | 1988 |
| Hamilton Ship Consultancy Ltd | Administrative & support | 2020 |