| Guney Marine Limited | London | 2026 |
| Gungilsund Ltd | Shetland | 2018 |
| Gunite Limited | Beckenham | 1992 |
| Gunlube Ltd | Swadlincote | 2014 |
| Gunmakers 1964 Limited | Birmingham | 2013 |
| Gunman 1956 Limited | Aylesbury | 2014 |
| Gunner Trading Ltd | Doncaster | 2024 |
| Gunners Property & Marketing Solutions Limited | London | 2023 |
| Gunning Group Limited | Dagenham | 2021 |
| Gunsafe Ltd | Aberystwyth | 2019 |
| Gunstone Limited | Kent | 2000 |
| Gunter Creasey Ltd | Whitland | 2024 |
| Gunthorpe Motorhomes Ltd | Nottingham | 2016 |
| Gunvenna Holiday Park Limited | Wadebridge | 2006 |
| Guo-An B-T6 Ltd | Beckenham | 2018 |
| Guolai Ceramic Co Ltd | Beckenham | 2023 |
| Guomai Trading Co., Ltd | Cardiff | 2021 |
| Guoxin Infu Co., Ltd. | Bromley | 2013 |
| Gupzoo Ltd | London | 2021 |
| Gur+U Ltd | Sheffield | 2024 |
| Guram Investments Ltd | Co Tyrone | 2002 |
| Gurchait Properties Limited | Huddersfield | 2023 |
| Gurevitch Limited | Oswestry | 2013 |
| Gurgle & Burn Limited | Moreton-In-Marsh | 2023 |
| Gurinder Singh Bains Ltd. | Coventry | 2005 |
| Gurkhas Ekta Paradise Limited | Hampton | 2019 |
| Gurkirpa Travel Ltd | Smethwick | 2023 |
| Gurminder Rattan Ltd | Ilford | 2024 |
| Gurminder Singh Ltd | Ilford | 2024 |
| Gurnam Singh Ltd | Dudley | 2025 |
| Gurnard Pines Limited | Chelmsford | 2012 |
| Guru Fund Management Ltd | London | 2004 |
| Guru Kirpa Properties Limited | Bexley | 2012 |
| Guru Marketing Limited | Street | 2009 |
| Guruvun Properties Ltd | Swindon | 2024 |
| Gusbourne Wines Limited | Appledore | 2013 |
| Gushui E-Commerce Co., Ltd | Beckenham | 2021 |
| Gusmangroup Ltd | London | 2023 |
| GUT Ltd | Manchester | 2022 |
| Guthrum House Limited | Ipswich | 1998 |
| Gutter and Roofing Ltd | Crawley | 2021 |
| Gutter Cleaning Specialists Ltd | Broadstone | 2016 |
| Gutter Maintenance & Preventative Roofing Solution (Gmprs) Ltd | Denbigh | 2025 |
| Gutter Supplies Ltd | Colchester | 2008 |
| Guttering Doctor Limited | Colchester | 2013 |
| Gutters & Ladders (1968) Limited | Sheffield | 2007 |
| Guven Marine Ltd | Blackpool | 2025 |
| Guvnor Analytics Limited | Ashtead | 2011 |
| Guwt Ltd | Bristol | 2023 |
| GUY & Co Projects Ltd | Shifnal | 2016 |
| GUY Barrett Illusion Design Ltd | Blackpool | 2017 |
| GUY Hedley Cars Ltd | Bromsgrove | 2015 |
| GUY London (UK) Limited | Newcastle-Under-Lyme | 2010 |
| GUY Martin Limited | Barnetby | 2016 |
| Guy's Cliffe Masonic Rooms Limited | Warwick | 1983 |
| Guylyn Estates Limited | Retford | 2011 |
| Guzzbury Studio Limited | Illminster | 2020 |
| Gv&Co Investments Limited | Leeds | 2023 |
| Gvia Limited | London | 2014 |
| Gvnes Ltd | London | 2025 |
| GVP Management Ltd | Bristol | 2016 |
| GW 1130 Limited | Telford | 1998 |
| GW Auto Centre Limited | Wakefield | 2025 |
| GW Enterprisesltd. Ltd. | London | 2018 |
| GW Ltd | Newmarket | 2008 |
| GW Management Ltd | Glasgow | 2016 |
| GW2 Limited | Horkstow | 2002 |
| GWA Thermal Management Technology Co., Ltd | Kington | 2006 |
| GWA Trustees Ltd | Berwick Upon Tweed | 2019 |
| Gwam & Mcbean Securities Ltd | London | 2017 |
| Gwasanaethau Cerbyd Crosville Motor Services Limited | Penrhyndeudraeth | 2018 |
| GWC Construction Ltd | Cheam | 2016 |
| GWD Group Ltd | Salisbury | 2026 |
| Gwen & Grace Ltd | Wells | 2020 |
| Gwendon Limited | Eastbourne | 2007 |
| Gwendrock Apartments Management Company Limited | Looe | 2011 |
| Gwent Aluminium and Upvc Products Limited | Cwmbran | 2011 |
| GWH Limited | Cradley Heath, West Midlands | 2018 |
| Gwilk Engineering Services Limited | Cardiff | 2013 |
| GWN Resources Limited | Washington | 2014 |
| GWP Recruitment Ltd | Woking | 2024 |
| GWP55 Limited | Ellesmere | 2013 |
| GWR Plant Hire Limited | Watford | 2019 |
| GWS Demolition Limited | Durham | 2022 |
| GWS Services Limited | Barnet | 2007 |
| Gwsp Secretaries Ltd | Bristol | 2004 |
| Gwyn Jones Management Ltd | Edinburgh | 2012 |
| Gwynedd Caravans Limited | Porthmadog | 2019 |
| Gwynedd Slate Ltd | Porthmadog | 2009 |
| Gwynt Gwndwn CYF | Llandeilo | 2025 |
| GX Intelligence Limited | London | 2022 |
| GXA International Ltd | Avon | 2021 |
| GXI Group Ltd | Stanmore | 2007 |
| GXL Technologies Limited | London | 2006 |
| GXO Logistics Drinkflow Limited | Northampton | 2006 |
| GXO Logistics Services UK Limited | Northampton | 1999 |
| GXO Ltd | Bury St. Edmunds | 2022 |
| GXO Servicetech UK II Limited | Northampton | 1999 |
| GYC Interior Solutions Limited | Great Yarmouth | 2024 |
| GYE Nyame Limited | Essex | 1998 |