| Guangzhou Leadergame Technology Co., Ltd | Cardiff | 2021 |
| Guangzhou Lingyin Construction Materials Ltd. | Beckenham | 2014 |
| Guangzhou Longgan Car Accessories Co., Ltd | Beckenham | 2024 |
| Guangzhou Mingjin Trading Co., Ltd | Beckenham | 2023 |
| Guangzhou Phoebe Garment Co., Ltd | London | 2024 |
| Guangzhou Shengpalai Trading Co., Ltd | Cambridge | 2024 |
| Guangzhou Shengyi Apparel Co., Ltd | Beckenham | 2024 |
| Guangzhou TPK Diesel Parts Co., Ltd | London | 2014 |
| Guangzhou Weihu Denim Co., Ltd. | London | 2022 |
| Guangzhou Yaping Shoes Co., Ltd | Beckenham | 2023 |
| Guangzhou Yongyue Trading Co., Ltd | Beckenham | 2023 |
| Guangzhou Youyi Trading Co., Ltd | London | 2021 |
| Guangzhou Zaijiang Import and Export Co., Ltd | London | 2020 |
| Guangzhou Zhuolin Printing Co., Ltd | Beckenham | 2019 |
| Guanlian Supply Management Co., Ltd | Kington | 2023 |
| Guanyu International Co., Ltd | London | 2012 |
| Guarantee Linen Services Ltd | Stalbridge | 1958 |
| Guaranteed Driveways & Excavations Ltd | Blackpool | 2021 |
| Guaranteed Personal and Business Training Solutions Ltd | Liverpool | 2009 |
| Guaranteed Services Ltd | Ilford | 2024 |
| Guarantor Insure Limited | Maidenhead | 2014 |
| Guard Dog Patrols Security Services Limited | Kent | 1997 |
| Guardbridge Commercial Limited | London | 2017 |
| Guardco Limited | Sutton Coldfield | 2003 |
| Guardhouse Properties Ltd | Penrith | 2017 |
| Guardian Advocates Ltd | Retford | 2015 |
| Guardian Angel Business Services Limited | Cheddar | 2006 |
| Guardian Angel Services Limited | Romford | 2018 |
| Guardian Consulting Services Ltd | Berkhamsted | 2024 |
| Guardian Environmental Limited | Bedford | 2021 |
| Guardian Fire Doors Ltd | Coventry | 2023 |
| Guardian GAS (Wales) Ltd | Bridgend | 2008 |
| Guardian Pension Trustees Ltd | London | 2005 |
| Guardian Procurement Care Ltd | Stockport | 2026 |
| Guardianhealth Innovations Ltd | London | 2026 |
| Guardify Security Limited | Bury St. Edmunds | 2024 |
| Guards Red Limited | Brierley Hill | 2023 |
| Guardsman Consultancy & Design Limited | Atherstone | 1988 |
| Guartel Surveillance and Security Systems Limited | Welshpool | 2002 |
| Gucu Marine Ltd | London | 2024 |
| GUD Community Alliance Limited | London | 2023 |
| Gudbrandsdal Gulv & Betong Limited | London | 2024 |
| Guddies Games Ltd | Belfast | 2024 |
| Gudereit-Uk Ltd | Teignmouth | 2026 |
| Gudrum Limited | Birmingham | 2004 |
| Guerilla Advertising Limited | Newcastle Upon Tyne | 2006 |
| Guerilla Interactive Limited | Newcastle Upon Tyne | 2006 |
| Guerilla Productions Limited | Newcastle Upon Tyne | 2006 |
| Guerilla Ware Limited | Newcastle Upon Tyne | 2004 |
| Guerilla Wear Limited | Newcastle Upon Tyne | 2004 |
| Guest and Adam's Holdings Limited | Pontypool | 2022 |
| Guest Golf Limited | Essex | 2006 |
| Guest, Keen and Nettlefolds, Limited | Birmingham | 1899 |
| Guesto Industry Limited | London | 2016 |
| Guestwick Farms Co. | Reepham | 1982 |
| Guggi Limited | London | 2010 |
| Guide Dogs Limited | Reading | 1989 |
| Guideline Managements Limited | Walsall | 1980 |
| Guiden Konsult I Uppsala Invest Limited | London | 2025 |
| Guiding Light Limited | Hull | 2016 |
| Guildersfield (Bognor Regis) Limited | Bognor Regis | 2011 |
| Guildford Fringe Theatre Company Limited | Guildford | 2024 |
| Guildford Metal Exchange Limited | Loughton | 2008 |
| Guildhall Developments (Doncaster) Limited | Pontefract | 2015 |
| Guildhall Doncaster Limited | Pontefract | 2015 |
| Guildhouse Investments Limited | | 1999 |
| Guilin Hualun Diamond Tools Co., Ltd | Beckenham | 2014 |
| Guilthwaite Hall Limited | Sheffield | 2013 |
| Guilthwaite Limited | Sheffield | 2013 |
| Guindi Enterprises Limited | Blackheath | 2021 |
| Guinevere Limited | London | 1994 |
| Guinness Capital Limited | Manchester | 2025 |
| Guinness Mahon Pensions Limited | London | 2017 |
| Guits Ltd | London | 2023 |
| Guiva Yachting Ltd | Harrow | 2023 |
| Guizhou Holding Co., Ltd. | Cambridge | 2013 |
| Gujral Limited | London | 2017 |
| Gulak Sussex Limited | Rugby | 2024 |
| Gulalas Invest Limited | London | 2020 |
| Gulalas Skonhetssalong Limited | London | 2020 |
| Gulam Mohammed Khamboo Limited | London | 2025 |
| Gulbourne Construction Limited | London | 1982 |
| Guldfabriken Limited | London | 2020 |
| Gulf Cars Ltd | Cardiff | 2019 |
| Gulf Centre for Sustainable Development Limited | London | 2013 |
| Gulf Enterprises Ltd | London | 2021 |
| Gulf Freight Services Limited | Iver | 2009 |
| Gulf Friendship Trading Co., Ltd | Beckenham | 2024 |
| Gulf WAR Risks Limited | London | 2021 |
| Gulfmall Repair Centre Ltd | London | 2012 |
| Gulliver Trustees (NO2) Limited | Ilford | 1966 |
| Gulliver Trustees(No 1)LIMITED | Ilford | 1965 |
| Gummer Leathes Employee Nominee Limited | London | 2024 |
| Gummy Bear Films Limited | Manchester | 2025 |
| Gumption Holding Limited | London | 2020 |
| Gundersen Plan-Og Byggesaker Limited | London | 2024 |
| Gundogdu Limited | London | 2011 |
| Gundul Yachting Ltd | London | 2023 |
| Gundyco Limited | Ballyclare | 2025 |
| Guner Yacht Ltd | Blackpool | 2025 |