| Gracious Diagnostic Scan Solution Limited | Health & social care | 2024 |
| Gradburn Limited | Professional & scientific | 2025 |
| Gradbury Limited | Professional & scientific | 2024 |
| Graden Management Limited | Professional & scientific | 2003 |
| Gradlor Limited | Professional & scientific | 2025 |
| Gradmin Limited | Professional & scientific | 2025 |
| Gragem Limited | Real estate | 2024 |
| Grainford Limited | Information & communication | 2011 |
| Grand Auto Cars Ltd | Wholesale & retail | 2025 |
| Grand Dinner Limited | Hospitality | 2022 |
| Grand Projects Construction Ltd | Construction | 2012 |
| Grand Scale Construction Group Ltd | Construction | 2020 |
| Grand Tyres Ltd | Wholesale & retail | 2019 |
| Grande Medical Services Ltd | Health & social care | 2019 |
| Grandiose Developments Ltd | Real estate | 2022 |
| Grandview Capital Ltd | Financial services | 2024 |
| Grange Gardens Management (Southgate) Limited | Real estate | 1979 |
| Grange Management Company (Rickmansworth) Limited(The) | Households | 1981 |
| Granlotus Ltd | Hospitality | 2025 |
| Graphite Engineering Design Ltd | Professional & scientific | 2020 |
| Grassroots and Beyond Limited | Professional & scientific | 2022 |
| Gray Hound Cars Limited | Transport & logistics | 2018 |
| Grazeful Ltd | Hospitality | 2022 |
| Great College Investments Limited | Extraterritorial | 1963 |
| Great Nest Limited | Real estate | 2021 |
| Great Stone Construction Ltd | Construction | 2024 |
| Greater London Engineering Limited | Construction | 2017 |
| Greater Properties Edgware Ltd | Real estate | 2022 |
| Greater Properties Streatham Vale Ltd | Real estate | 2023 |
| Grediano Commercial Services Limited | Professional & scientific | 2018 |
| Greek Grill Santorini Ltd | Hospitality | 2018 |
| Greek Wine Cellars UK Ltd | Extraterritorial | 2023 |
| Green Bay Capital Ltd | Administrative & support | 2011 |
| Green Capital Motors Ltd | Wholesale & retail | 2025 |
| Green Clinic Physio Limited | Health & social care | 2026 |
| Green Edge Films Ltd | Information & communication | 2020 |
| Green Energy Buses UK Ltd | Wholesale & retail | 2024 |
| Green Nest Ltd | Real estate | 2017 |
| Green Sparkle Limited | Construction | 2018 |
| Green Walk Limited | Professional & scientific | 2015 |
| Greenacres Montessori Limited | Education | 2011 |
| Greenbananapr Ltd | Professional & scientific | 2020 |
| Greenbaum Training and Consultancy Limited | Administrative & support | 2008 |
| Greencrest Housing Ltd | Real estate | 2024 |
| Greenhouse Constructiona Ltd | Construction | 2018 |
| Greenpath Estates Limited | Real estate | 2018 |
| Greensyne Limited | Professional & scientific | 2017 |
| Greentrees NO. 1 Residents Company Limited | Households | 1991 |
| Greentrees NO.2 Residents Company Limited | Households | 1992 |
| Greenvent Innovations Ltd | Manufacturing | 2025 |
| Greenvue Venue Ltd | Real estate | 2011 |
| Greenwave Housing Ltd | Real estate | 2024 |
| Greenway Holdings Edgware Limited | Real estate | 2019 |
| Greg & Sherry Limited | Information & communication | 2015 |
| Greg Brickwork Ltd | Construction | 2023 |
| Grenmere Limited | Professional & scientific | 2024 |
| Grenmore Limited | Professional & scientific | 2025 |
| Grent Investments LLP | | 2011 |
| Grey Birch Property Services Limited | Professional & scientific | 2021 |
| Grey Wolf Living Limited | Professional & scientific | 2025 |
| Greypath Estates Ltd | Real estate | 2021 |
| Greystone Care Limited | Real estate | 2021 |
| Grhum Investments Limited | Real estate | 2025 |
| Grhum Ltd | Hospitality | 2023 |
| Grill on the Green Limited | Hospitality | 2017 |
| Grilled 2 Go Limited | Hospitality | 2025 |
| Gripgo Tyre Limited | Wholesale & retail | 2025 |
| Grmc Properties Ltd | Real estate | 2021 |
| Grnata Green Energy Ltd | Administrative & support | 2024 |
| Groovy Vape Stop Ltd | Wholesale & retail | 2021 |
| Grosvenor Freeholds Limited | Real estate | 2006 |
| Grosvenor Hospitals Group Ltd | Health & social care | 2014 |
| Ground Rent Stock Limited | Real estate | 2014 |
| Group 28 Ltd | Real estate | 2017 |
| Group 96 Ltd | Real estate | 2017 |
| Grove Reading Estates Limited | Real estate | 2022 |
| Grove Reading Ltd | Real estate | 2022 |
| Grove Residential Limited | Real estate | 2007 |
| Grove Road One (Chadwell Heath) Management Company Limited | Households | 2001 |
| Grove View Property Consultants Limited | Professional & scientific | 2021 |
| Grove Will Writing Services Ltd | Professional & scientific | 2016 |
| Grovebell Trading Limited | Wholesale & retail | 2010 |
| Grovemoor Limited | Construction | 2008 |
| Grownomics Ltd | Information & communication | 2019 |
| GRS Construction UK Limited | Construction | 2016 |
| GS7 IT Consultants Ltd | Information & communication | 2016 |
| GT Instrumentation Services Ltd | Administrative & support | 2011 |
| GTI Cars Ltd | Wholesale & retail | 2023 |
| Guard IQ Ltd | Information & communication | 2025 |
| Guard Safe International Ltd | Administrative & support | 2025 |
| Guard SEC International Limited | Administrative & support | 2018 |
| Guardian Security Seals Limited | Wholesale & retail | 2003 |
| Gudaru Health Limited | Health & social care | 2025 |
| Gudiro Ltd | Wholesale & retail | 2025 |
| Guerilla Films Limited | Information & communication | 1995 |
| Guezbh Limited | Real estate | 2024 |
| Guide Hair & Beauty Salon Ltd | Other services | 2022 |
| Guide Hub Ltd | Professional & scientific | 2020 |
| Gujarati Priest Limited | Other services | 2022 |
| Gulf English Education Ltd. | Education | 2016 |