| Green Deal Marketing Southern Limited | Administrative & support | 2013 |
| Green Energy Installations Southern Limited | Construction | 2023 |
| Green Farm Media Limited | Information & communication | 2011 |
| Green FOX Electrical Ltd | Construction | 2024 |
| Green FOX Painting Ltd | Construction | 2024 |
| Green Life Driving Ltd | Education | 2018 |
| Green the Grey Ltd | Professional & scientific | 2019 |
| Greenford Specsavers Limited | Wholesale & retail | 2003 |
| Greenhomesuk Ltd | Construction | 2022 |
| Greenlight Care Solutions Limited | Health & social care | 2020 |
| Greenock Specsavers Hearcare Limited | Wholesale & retail | 2018 |
| Greenock Visionplus Limited | Wholesale & retail | 1992 |
| Greens Contract Management Ltd | Construction | 2022 |
| Greens Electrical Contractors Ltd | Construction | 2022 |
| Greenspruce LP | | 2013 |
| Greenstar Solar Ltd | Energy | 2024 |
| Greenward Energy Ltd | Construction | 2022 |
| Greenway (Southern) Ltd | Construction | 2025 |
| Greenwich Specsavers Limited | Wholesale & retail | 2022 |
| Greg Searle Fencing Ltd | Manufacturing | 2022 |
| Gregory Collins Ltd | Construction | 2011 |
| Gresham Care Limited | Real estate | 1998 |
| Gresham Power Electronics Limited | Manufacturing | 1998 |
| Grey Iris Ltd | Information & communication | 2021 |
| Greyhawk Cyber (UK) Ltd | Information & communication | 2025 |
| Greylock Technology Limited | Information & communication | 2018 |
| Grid Concepts Ltd | Manufacturing | 2026 |
| Grid Controls Ltd | Manufacturing | 2017 |
| Grilfix Limited | Administrative & support | 2018 |
| Grime to Shine Anytime Ltd | Administrative & support | 2024 |
| Grimm Brothers Contractors Limited | Construction | 2020 |
| Grosvenor Developments (Southern) Limited | Construction | 2002 |
| Groundbolt Limited | Professional & scientific | 2012 |
| Group Executive Agencies Limited | Financial services | 1986 |
| Groves Group Holdings Ltd | Real estate | 2022 |
| Groves Group Ltd | Construction | 2021 |
| Groves Homes Ltd | Construction | 2023 |
| Growth COG Ltd | Information & communication | 2020 |
| Growth Habits Ltd | Administrative & support | 2025 |
| Growth Mode Ltd | Professional & scientific | 2019 |
| GROWTHGURU2 Ltd | Wholesale & retail | 2023 |
| Grsa Services Ltd | Professional & scientific | 2021 |
| Grsb Haulage Ltd | Transport & logistics | 2016 |
| Gryphon Properties Limited | Real estate | 1998 |
| GS Properties Hub Limited | Real estate | 2025 |
| GS Water Ltd | Professional & scientific | 2024 |
| GT Estates Management Limited | Real estate | 2013 |
| GT HQ Ltd | Hospitality | 2025 |
| Guard Engineering Yorkshire Ltd | Manufacturing | 2026 |
| Guardant Investments Limited | Real estate | 2018 |
| Guardian Roof UK Limited | Construction | 2016 |
| Guarding the Flock Limited | Professional & scientific | 2026 |
| Guards Court Residents Assoc. (Sunningdale) Limited | Households | 1993 |
| Guess Group Limited | Professional & scientific | 2000 |
| Guided Journey Ltd | Professional & scientific | 2026 |
| Guildford City Swimming Club | Arts & recreation | 2011 |
| Guildford Domi Audiology Specsavers Limited | Wholesale & retail | 2026 |
| Guildford Specsavers Hearcare Limited | Wholesale & retail | 2017 |
| Guildford Specsavers Limited | Wholesale & retail | 1996 |
| Guildford Visionplus Limited | Wholesale & retail | 1996 |
| Guillemot Limited | Wholesale & retail | 1997 |
| Guinevere Antiques Limited | Wholesale & retail | 1966 |
| Guisborough Specsavers Limited | Wholesale & retail | 2005 |
| Guiseley Specsavers Limited | Wholesale & retail | 2001 |
| Guiseley Visionplus Limited | Wholesale & retail | 2001 |
| Gulsera Property Co Ltd | Real estate | 2026 |
| Gumboot Pictures Limited | Administrative & support | 2007 |
| GUNCO11 Limited | Wholesale & retail | 1998 |
| Gunmark Limited | Wholesale & retail | 1971 |
| Gurnard Navigation Limited | Information & communication | 1998 |
| Gutterflo Limited | Manufacturing | 2016 |
| GUY Lawson Project Management Ltd | Construction | 2006 |
| Guyihup Lopo Limited | Wholesale & retail | 2025 |
| GVN Estate Invest Ltd | Real estate | 2024 |
| GVN Reality Trading Ltd | Real estate | 2024 |
| GW Legal Solutions Limited | Professional & scientific | 2025 |
| GWB Network Solutions Ltd | Information & communication | 2024 |
| Gwent Domiciliary Specsavers Limited | Wholesale & retail | 2014 |
| GWP Sales Limited | Wholesale & retail | 2025 |
| Gyle Centre Specsavers Limited | Wholesale & retail | 2009 |
| Gyle Centre Visionplus Limited | Wholesale & retail | 2009 |
| Gym Factory Truro Ltd | Arts & recreation | 2018 |
| Gymbees Coaching Ltd | Education | 2021 |
| H Baker Events Ltd | Professional & scientific | 2022 |
| H C Coils Ltd. | Manufacturing | 2012 |
| H C Coils Topco Limited | Administrative & support | 2025 |
| H R PTS Limited | Administrative & support | 2021 |
| H Recruitment Partnership Ltd | Administrative & support | 2019 |
| H&B Delights Ltd | Hospitality | 2026 |
| H&S Consulting Limited | Professional & scientific | 2022 |
| H.A Elite K9 Patrol and Response Ltd | Administrative & support | 2025 |
| H.A. Boulton (Flooring) Limited | Construction | 1984 |
| H.I.T Technical Solutions Limited | Information & communication | 2013 |
| H.O.W GAS Ltd | Construction | 2023 |
| H2FREE Ltd | Professional & scientific | 2026 |
| H2O Pressure Washing Services Limited | Administrative & support | 2026 |
| H2O Sports Limited | Administrative & support | 2003 |
| H2O2U Water Ltd | Transport & logistics | 2025 |
| Haberfield Consultancy Limited | Professional & scientific | 2010 |
| Habitus Park Square Limited | Real estate | 2024 |