| Gainsborough (Film & T.V.) Pictures Limited | Information & communication | 1986 |
| Galaxy Group Service Ltd | Administrative & support | 2021 |
| Gamervit Ltd | Manufacturing | 2019 |
| Garage Style Group Ltd | Financial services | 2023 |
| Garage Style Ltd | Construction | 2017 |
| Garage Style Properties Ltd | Real estate | 2023 |
| Gardells Ltd | Real estate | 2020 |
| Garden City Arts Limited | Education | 2014 |
| Garden Spice Ltd | Hospitality | 2020 |
| Gardens and Designs Projects Limited | Administrative & support | 2015 |
| Gardenscape Ltd | Administrative & support | 2017 |
| Garnell Corporate Communications Limited | Information & communication | 1997 |
| Garnell Corporation Limited | Wholesale & retail | 1997 |
| Garnell Property Investments Limited | Real estate | 2000 |
| Garnell Technologies Limited | Information & communication | 2013 |
| Garnell Trustees Limited | Administrative & support | 2020 |
| GATE2PHARMA Ltd | Wholesale & retail | 2014 |
| GB Cart Ltd | Wholesale & retail | 2025 |
| Gbesh Ltd | Wholesale & retail | 2026 |
| GBN Holding Limited | Financial services | 2025 |
| Gchl Trustees Limited | Other services | 2021 |
| GD Jones Plumbing & Heating Limited | Construction | 2026 |
| Gem-'N-I Childcare Limited | Education | 2016 |
| Gemérea Jewellery Ltd | Wholesale & retail | 2024 |
| Gentlevale Care Ltd | Health & social care | 2026 |
| Geosec Ground Engineering Ltd | Construction | 2023 |
| Geramon Ecommerce Ltd | Wholesale & retail | 2024 |
| Gergin Ltd | Wholesale & retail | 2024 |
| GET Baked Ltd | Hospitality | 2022 |
| GET Optimal Ltd | Health & social care | 2024 |
| Getsetgig Ltd | Information & communication | 2026 |
| GFR Electrical Limited | Construction | 2026 |
| GI Guard Solutions Ltd | Financial services | 2022 |
| Gidi Ltd | Construction | 2025 |
| Giffard Lodge Ltd | Wholesale & retail | 2002 |
| Give and Grow CIC | Education | 2025 |
| GK Foods (UK) Limited | Hospitality | 2007 |
| GKS Carpentry Limited | Construction | 2018 |
| Glasson Metalworks Limited | Manufacturing | 2003 |
| Glasturn Limited | Information & communication | 2016 |
| Glenview Recruitment Solutions Ltd | Administrative & support | 2025 |
| Global Connector Technology Ltd | Wholesale & retail | 2009 |
| Global Mechanics Ltd | Wholesale & retail | 2026 |
| Globalcarworld Limited | Wholesale & retail | 2023 |
| Globewin Limited | Wholesale & retail | 2013 |
| GM Digital Solutions Ltd | Information & communication | 2024 |
| Gncc Limited | Professional & scientific | 2016 |
| GNR Online London Ltd | Information & communication | 2024 |
| Godustfree Cleaning Services Ltd | Administrative & support | 2021 |
| Gogogo Services Ltd | Transport & logistics | 2018 |
| Goldcross Commercial Limited | Hospitality | 2001 |
| Golding Properties Watford Limited | Extraterritorial | 1982 |
| Goldstone Ventures Ltd | Real estate | 2026 |
| Good Care at Home Limited | Health & social care | 2024 |
| Goode & Smith Group Holdings Limited | Administrative & support | 2017 |
| Goode Sport Ltd | Wholesale & retail | 2014 |
| Goodwink Ltd | Wholesale & retail | 2023 |
| Gorringo Limited | Wholesale & retail | 2010 |
| Goulden Travel Limited | Transport & logistics | 2026 |
| Goya Limited | Wholesale & retail | 2007 |
| GP Health & Nature Care Limited | Health & social care | 2021 |
| Grace Foods UK Limited | Wholesale & retail | 1907 |
| GRAD2TEACH Ltd | Education | 2019 |
| Graham Ross Oncology Consulting Services Ltd | Professional & scientific | 2017 |
| Grandis Solutions Ltd | Professional & scientific | 2022 |
| Graphs Cleaning Services Ltd | Administrative & support | 2025 |
| Gravattpr Ltd | Professional & scientific | 2023 |
| Graveltech Driveway Solutions Limited | Construction | 2008 |
| Great Planning Ltd | Professional & scientific | 2019 |
| Green Blue Grey (Holdings) Limited | Professional & scientific | 2023 |
| Green Slab Limited | Financial services | 2023 |
| Green Wise Ltd | Hospitality | 2017 |
| Greenfields Nursery School Ltd | Education | 2011 |
| Greenlight Architects Limited | Professional & scientific | 2019 |
| Greenview Property Limited | Real estate | 2019 |
| Groove Marketing Limited | Administrative & support | 2023 |
| Ground Construction Holdings Limited | Construction | 2018 |
| Ground Construction Limited | Construction | 1997 |
| Ground Construction Plant Hire Limited | Construction | 2011 |
| Ground Skips Limited | Construction | 2006 |
| Ground Waste Recycling Ltd | Water & waste | 1986 |
| Growth Advisory Ltd | Professional & scientific | 2021 |
| Growthwood Ltd | Professional & scientific | 2020 |
| GS Construction & Design Ltd | Construction | 2022 |
| GSI Trans Limited | Transport & logistics | 2017 |
| GT Consulting Limited | Administrative & support | 2024 |
| GT Electrics Limited | Construction | 2000 |
| Guessens Mews Management Limited | Households | 2021 |
| Gujjula Consulting Limited | Information & communication | 2018 |
| Gujjula Realty Ltd | Real estate | 2022 |
| Gujjula Transportation Limited | Transport & logistics | 2025 |
| Gulf for Good | Health & social care | 2010 |
| Guren Group Limited | Wholesale & retail | 2024 |
| GW Fieldwork Ltd | Professional & scientific | 2024 |
| GW Stocktakers Limited | Administrative & support | 2024 |
| GZK Software Ltd | Information & communication | 2008 |
| H & R Drainage Limited | Water & waste | 2020 |
| H L S Structural Engineers Limited | Professional & scientific | 2013 |
| H Mason (Tidemill) Limited | Real estate | 2001 |
| H&T Estates Ltd | Real estate | 2020 |