| Guest-Hill Ltd | Hospitality | 2025 |
| Guesthoo Ltd | Real estate | 2019 |
| Guglielminetti Limited | Financial services | 2025 |
| Gugume Ltd | Wholesale & retail | 2026 |
| Guide.Ai Ltd | Information & communication | 2021 |
| Guided. Financial Ltd | Information & communication | 2022 |
| Guideline Limited | Wholesale & retail | 2025 |
| Guidevision UK Ltd | Information & communication | 2015 |
| Guild Asset Management Limited | Real estate | 2025 |
| Guild of Dough Ltd. | Manufacturing | 2021 |
| Guildbill Limited | Real estate | 1980 |
| Guilded Cage Properties Ltd | Real estate | 2022 |
| Guinea Street Limited | Construction | 2016 |
| Guiver Group Limited | Construction | 2009 |
| Guiver Properties Ltd | Real estate | 2023 |
| Gujar Private Limited | Real estate | 2024 |
| Gujify Ltd | Professional & scientific | 2021 |
| Gujo Catering Ltd | Hospitality | 2026 |
| GUL & GUL Catering Limited | Hospitality | 2022 |
| Gulfjet Aviation Ltd | Transport & logistics | 2022 |
| Gullwing Cars Ltd | Wholesale & retail | 2017 |
| Gully's Kitchen Ltd | Hospitality | 2026 |
| Gully's Property Ltd | Real estate | 2025 |
| Gullyclo Ltd | Wholesale & retail | 2025 |
| Gulp Ltd | Wholesale & retail | 2025 |
| Gumala Bess Limited | Energy | 2021 |
| Gumus Farma Limited | Wholesale & retail | 2019 |
| GUN Ltd | Information & communication | 2013 |
| Gunn Business Consultancy Limited | Financial services | 2013 |
| Gunner & Co Ltd | Financial services | 2014 |
| Gunning Bespoke Ltd | Professional & scientific | 2022 |
| GUO228 Ltd | Hospitality | 2019 |
| Gupta G Foods Ltd | Hospitality | 2026 |
| Gurkirpa Logistics Ltd | Transport & logistics | 2026 |
| Gurr Johns Capital Ltd | Professional & scientific | 2012 |
| Gurr Johns International Limited | Financial services | 2020 |
| Gurr Johns Limited | Professional & scientific | 1973 |
| Gurt Lush Choir Limited | Other services | 2022 |
| GUS Property Limited | Real estate | 2020 |
| Gusoi Logistics Services Limited | Transport & logistics | 2025 |
| Gutter Specialist Ltd | Administrative & support | 2023 |
| Guve Foods Ltd | Hospitality | 2026 |
| Guwt Ltd | Extraterritorial | 2023 |
| GUY Design & Build Limited | Construction | 2021 |
| GUY Pullen Ltd | Professional & scientific | 2019 |
| GUY Rolfe Property Ltd | Real estate | 2019 |
| Guy's Bars Ltd | Hospitality | 2025 |
| GV Agents Ltd | Real estate | 2020 |
| GV Zero Carbon Limited | Professional & scientific | 2009 |
| GVF Consulting Ltd | Information & communication | 2024 |
| Gvmd Commercial Limited | Professional & scientific | 2026 |
| GVP Management Ltd | Extraterritorial | 2016 |
| GW Autobody Repairs Limited | Wholesale & retail | 2017 |
| GW Builders Ltd | Construction | 2022 |
| GW Holdings (Bristol) Ltd | Financial services | 2023 |
| GW Pension Advisor Limited | Financial services | 2021 |
| GW Renewable Technologies Limited | Construction | 2011 |
| Gwcr Limited | Hospitality | 2024 |
| GWD Great Eastern House RTM Company Ltd | Households | 2025 |
| GWD Great Western House RTM Company Ltd | Households | 2025 |
| GWD Horsley House RTM Company Ltd | Households | 2025 |
| GWD Kingdom House RTM Company Ltd | Households | 2025 |
| GWD Steamship House RTM Company Ltd | Households | 2025 |
| GWE Business West Ltd | Administrative & support | 2007 |
| Gwendra Group Limited | Financial services | 2013 |
| Gwendra Holdings Limited | Construction | 2011 |
| Gwopo Wrld Ltd | Wholesale & retail | 2025 |
| GWR (Agricultural) Limited | Water & waste | 2016 |
| GWR Estates Limited | Real estate | 2024 |
| GWR Group Holdings Limited | Water & waste | 2024 |
| GWR Residential Solutions Ltd | Real estate | 2013 |
| GWR Sustainability Ltd | Agriculture & fishing | 2024 |
| GWR Waste & Recycling Ltd | Water & waste | 2022 |
| Gwre Ltd | Real estate | 2023 |
| GWS Ceilings Ltd | Construction | 2013 |
| GWS Media Limited | Information & communication | 2007 |
| Gwsp Secretaries Ltd | Extraterritorial | 2004 |
| GXS Trading Ltd | Wholesale & retail | 2026 |
| Gy&Rh Limited | Real estate | 2026 |
| GYA Pitta Ltd | Hospitality | 2026 |
| Gyles Brothers Limited | Wholesale & retail | 1911 |
| Gym Bros Apparel Ltd | Manufacturing | 2026 |
| Gym Flooring Limited | Construction | 2019 |
| Gym on the Green Ltd | Arts & recreation | 2024 |
| Gym Professor Ltd. | Wholesale & retail | 2015 |
| Gymcomm Ltd | Arts & recreation | 2023 |
| Gymrun Ltd | Education | 2016 |
| Gymstart Ltd | Arts & recreation | 2021 |
| Gymwahn Ltd | Information & communication | 2016 |
| Gymy Trans Logistics Ltd | Transport & logistics | 2014 |
| Gynaecologyservices@London Limited | Health & social care | 2022 |
| Gyorgyi Horvath Limited | Health & social care | 2009 |
| Gypsy Spirit Ltd | Extraterritorial | 2023 |
| H & a Partnership Ltd | Real estate | 2026 |
| H & C Financial Planning Ltd | Financial services | 2018 |
| H & H Builders and Contractors Ltd | Construction | 2014 |
| H & H Khan Limited | Professional & scientific | 2008 |
| H & H Properties SW Ltd | Real estate | 2020 |
| H & P Aerials (South West) Ltd | Wholesale & retail | 2008 |
| H & R Bristol Limited | Wholesale & retail | 2025 |