| Gracy Jewellers Swindon Ltd | Manufacturing | 2020 |
| Gradus Groundworks Ltd | Construction | 2025 |
| Graft Property Solutions Ltd | Construction | 2019 |
| Graham James Associates Limited | Real estate | 2005 |
| Graham Montrose Company Limited(The) | Hospitality | 1975 |
| Grain and Weave Limited | Extraterritorial | 2014 |
| Gralisson Consultancy Ltd | Professional & scientific | 2025 |
| Gralisson Properties Limited | Real estate | 2022 |
| Grand Bazaar Ltd | Wholesale & retail | 2026 |
| Grand Bazaar Swindon Ltd | Wholesale & retail | 2019 |
| Grand Motors Ltd | Wholesale & retail | 2025 |
| Grange Kitchens Limited | Construction | 2011 |
| Granity Point Group Limited | Financial services | 2025 |
| Grant Carpentry and Construction Limited | Construction | 2005 |
| Grant Colson Financial Planning Ltd | Professional & scientific | 2014 |
| Grant Engineering (UK) Limited | Construction | 1996 |
| Grant Fraser Town & Country Ltd | Real estate | 2019 |
| Grants Dental Practice Ltd | Health & social care | 2022 |
| Graphene Capital Partners Limited | Extraterritorial | 1982 |
| Graspinsights Limited | Professional & scientific | 2013 |
| Grass Perfect Ltd | Administrative & support | 2014 |
| Grasscourt GP Limited | Financial services | 2016 |
| Grasscourt Partners LP | | 2016 |
| Grasslands Habitat and Wildlife Research Ltd | Professional & scientific | 2021 |
| Grassroots Gaffers Ltd | Manufacturing | 2026 |
| Gravitas Carpentry Ltd | Manufacturing | 2024 |
| Grazeaway Ltd | Information & communication | 2026 |
| GRB Consultancy (Swindon) Limited | Professional & scientific | 2025 |
| GRC Enterprise Limited | Extraterritorial | 2009 |
| Great British Gift Box Ltd | Wholesale & retail | 2019 |
| Great Cleaning Services Limited | Administrative & support | 2022 |
| Great Cotmarsh Farm LLP | | 2024 |
| Great Wall Estates Limited | Real estate | 2019 |
| Great Western Academy Limited | Education | 2014 |
| Great Western Building Services Ltd | Construction | 2015 |
| Great Western Clearance LLP | | 2020 |
| Great Western Driving Academy Ltd | Education | 2021 |
| Great Western Enterprise (Holdings) Limited | Administrative & support | 1986 |
| Great Western Fryer Ltd | Hospitality | 2024 |
| Great Western Hotel (Swindon) Limited | Hospitality | 2011 |
| Great Western Interiors Ltd | Construction | 2015 |
| Great Western Plumbing and Heating Ltd | Construction | 2024 |
| Great Western Property Limited | Construction | 2015 |
| Great Western Smart Living Limited | Real estate | 2025 |
| Great Western Windscreens Limited | Wholesale & retail | 2001 |
| Greater Everyday Limited | Wholesale & retail | 2020 |
| Greatmoor Lakes Limited | Construction | 1998 |
| Green 13 Holdings Limited | Professional & scientific | 2016 |
| Green 13 Research Limited | Information & communication | 2016 |
| Green 13 Software Limited | Information & communication | 2016 |
| Green 13 Solutions Limited | Information & communication | 2013 |
| Green 14 Vectis Limited | Financial services | 2022 |
| Green Delta Limited | Hospitality | 2019 |
| Green Fresh Restaurant Ltd | Manufacturing | 2023 |
| Green Grass Broadband Ltd | Information & communication | 2016 |
| Green Hills Cleaning Limited | Administrative & support | 2012 |
| Green Inc (EU) Limited | Information & communication | 2010 |
| Green Machine Berkshire Limited | Administrative & support | 2025 |
| Green Machine Wiltshire Ltd | Administrative & support | 2025 |
| Green Room 101 Limited | Professional & scientific | 2025 |
| Green Sky Contract Services Ltd | Real estate | 2018 |
| Green Space Eateries Limited | Hospitality | 2021 |
| Green Trees Forest Schools CIC | Education | 2025 |
| Greenberg Holdings Ltd | Financial services | 2025 |
| Greenbird Developments Limited | Real estate | 2022 |
| Greenbridge MOT Autocentre Ltd | Wholesale & retail | 2019 |
| Greendragons Property Limited | Real estate | 2019 |
| Greene Plumbing & Heating Specialists Limited | Construction | 2025 |
| Greene UK Ltd | Wholesale & retail | 2021 |
| Greenfield Construction Solutions & Employment Services Ltd | Construction | 2020 |
| Greenham Hand Car Wash Ltd | Wholesale & retail | 2016 |
| Greenham Research Consulting Ltd | Professional & scientific | 2014 |
| Greenlaw Performing Arts Ltd | Arts & recreation | 2017 |
| Greenleaze Management Company Limited | Households | 2004 |
| Greenmeadow Car Wash Ltd | Administrative & support | 2020 |
| Greenmeadow View Management Company Limited | Real estate | 2008 |
| Greentech Developers UK Limited | Real estate | 2010 |
| Greenway Farm Livery Limited | Agriculture & fishing | 2026 |
| Greenwing Developments Ltd | Construction | 2016 |
| Greenwood Management Services Ltd | Professional & scientific | 2016 |
| Greg Contractors Ltd | Construction | 2024 |
| Greg Hallam Music Ltd | Arts & recreation | 2018 |
| Gregulations Limited | Professional & scientific | 2024 |
| Grenville House RTM Company Ltd | Households | 2019 |
| Greur Ltd | Real estate | 2024 |
| Grey Goose Property Solutions Ltd | Construction | 2021 |
| Grey Sun Limited | Wholesale & retail | 2015 |
| Greyn Fine Carpentry Limited | Construction | 2021 |
| Greystone Mews Management Limited | Households | 2009 |
| Greytwo Ltd | Information & communication | 2019 |
| Gridserve Cornish Solar Ltd | Energy | 2022 |
| Gridserve EH Ltd | Energy | 2021 |
| Gridserve Ehgv Limited | Energy | 2023 |
| Gridserve Electric Hubs Limited | Financial services | 2020 |
| Gridserve Emea Depc Ltd | Energy | 2010 |
| Gridserve Emea Ltd | Financial services | 2017 |
| Gridserve Emea OMM Ltd | Financial services | 2017 |
| Gridserve Emea Projects Ltd | Financial services | 2017 |
| Gridserve Estates Limited | Real estate | 2018 |
| Gridserve HC Ltd | Financial services | 2020 |