| G.A.H. (Refrigeration Products) Limited | London | 2003 |
| G.A.Newton and SON Ltd | Lincoln | 2014 |
| G.A.R. Pollard Engineering (Tewkesbury) Limited | Tewkesbury | 1978 |
| G.And J.Ping Limited | Sheffield | 1951 |
| G.B. Edwards Limited | Helston | 1960 |
| G.B. Lubricants Limited | Shrewsbury | 2015 |
| G.B.Nominees Limited | London | 1967 |
| G.C. Hahn and Company Limited | London | 1997 |
| G.C.Supplies Limited | Bolton | 1995 |
| G.D.A. Installations Limited | Bishop'S Stortford | 2004 |
| G.E. (UK) Limited | Macclesfield | 1997 |
| G.E. Carpentry Services Limited | Rugby | 1999 |
| G.E. Cook & Sons Sales Limited | Halstead | 1986 |
| G.F. Compressors Limited | Birmingham | 1989 |
| G.F. Cook (Funerals) Limited | Sutton Coldfield | 1992 |
| G.F. Haynes & Co. Limited | Walsall | 1973 |
| G.F. Hunt (Bath) Limited | Sutton Coldfield | 1953 |
| G.F.E. Electrical Wholesale Limited | Chesterfield | 1963 |
| G.G.R. Glass Services Ltd. | Chadderton | 2011 |
| G.Garnett & Sons,Limited | Manchester. | 1906 |
| G.H Brothers Construction Company Ltd | Tipton | 2024 |
| G.H. Newbery & SON Limited | Exeter | 2013 |
| G.H. Rigby Pipe Supports Limited | Warrington | 2011 |
| G.H. Yeomans Motors Limited | Hereford | 2016 |
| G.I.S. Industrial Services Limited | Hertfordshire | 1996 |
| G.J.Garrett & Sons,Limited | Essex | 1919 |
| G.K.N. International Trading (Holdings) Limited | London | 1905 |
| G.M.B. and W.E.B. Finance Limited | Woodbridge | 2019 |
| G.M.B. Nominees Limited | Woodbridge | 2019 |
| G.M.P. (Birmingham) Limited | Bromsgrove | 1995 |
| G.M.S. Engineering (Holdings) Limited | Glasgow | 2013 |
| G.M.S. Thermal Products Limited | Glasgow | 2013 |
| G.O.I. Advanced Business Solutions Ltd | London | 2016 |
| G.P. Woods Limited | Letchworth Garden City | 1973 |
| G.R Car Sales Ltd | Hull | 2025 |
| G.R. Tanner Co. | Ashford | 1958 |
| G.S. Pascoe Carpentry & Decorating Limited | Witney | 2003 |
| G.Sokolovas Ltd | Kettering | 2015 |
| G.T. Electrical Sales Ltd | Macclesfield | 2010 |
| G.T. Power Limited | Southend-On-Sea | 1992 |
| G.T. Precision Limited | St. Leonards-On-Sea | 1998 |
| G.V.D. Construction Ltd | London | 2016 |
| G.W Earle Maintenance Ltd | Liskeard | 2020 |
| G.W. Films Limited | Canterbury | 1954 |
| G1 Security and Management Limited | Whetstone | 2023 |
| G11 Consultancy Limited | Birmingham | 2017 |
| G1LDER Ltd | Manchester | 2020 |
| G1SELLE Limited | Harrogate | 2020 |
| G2 Technologies Ltd | London | 2016 |
| G2 Technology Limited | Horsham | 2015 |
| G2 Works Limited | Greenford | 2022 |
| G20 GAS Solutions Ltd | Woodstock | 2019 |
| G2BIOGENEUK Limited | London | 2022 |
| G2F Media Ltd | Bury | 2015 |
| G2F Media Services Limited | Bury | 2014 |
| G2S Limited | Wigan | 2021 |
| G3Z1W2K5T Ltd | Totnes | 2025 |
| G4 Shared Services Limited | Derby | 2022 |
| G4BBY Ltd | Harrogate | 2015 |
| G4VIN Ltd | Harrogate | 2015 |
| G9 Vehicle Solutions Limited | Barnsley | 2019 |
| GA Access Ltd | Wellingborough | 2024 |
| GA Global Partners Ltd | London | 2014 |
| GA Signs Limited | Ilkley | 2023 |
| GAB Trading Limited | Ormskirk | 2012 |
| Gabble Software Limited | Nottingham | 2011 |
| Gable Homes Holdings Limited | Guildford | 2011 |
| Gable House Estates Limited | London | 1986 |
| Gable Maintenance Limited | Tamworth | 2003 |
| Gablehouse Developments Limited | Tarporley | 2015 |
| GABR1ELLA Limited | Harrogate | 2020 |
| Gabriel Karlsen Limited | Cardiff | 2025 |
| Gabriel Sorin Lastun Ltd | City Of London | 2021 |
| Gabriela’S Accessories Investment Limited | London | 2022 |
| Gabriela’S Accessories Limited | London | 2022 |
| Gabriele & Amelia Ltd | Stockton-On-Tees | 2012 |
| Gabrielle Fabrics Co., Ltd. | Beckenham | 2015 |
| Gabrielli Lighting Limited | West Midlands | 2007 |
| Gabrielli Limited | West Midlands | 2007 |
| Gabsta Limited | London | 2011 |
| GAC Capital Ltd | Bromley | 2022 |
| Gadbury Auto Salvage (Dismantlers) Ltd | Manchester | 2021 |
| Gadd & Scott Limited | | 1944 |
| Gadda Harcourt Ltd | Glastonbury | 2012 |
| Gade Residents Management Company Limited | Cambridge | 2019 |
| Gadfly Aircraft Limited | London | 2017 |
| Gadfly Capital Limited | London | 2025 |
| Gadgets Disco Limited | Reading | 2004 |
| Gadminster Estates Limited | Wimbourne | 2021 |
| Gadolinium Limited | Sandbach | 2021 |
| Gadsby Nichols Limited | Derby | 2014 |
| Gadsby Wicks Limited | Chelmsford | 2015 |
| Gadsons Group Ltd | Bath | 2025 |
| Gadwall Wulff Capital Limited | Worcester | 2026 |
| Gaebridge Encoders Limited | Wrexham | 2004 |
| Gael 4CE Limited | Uxbridge | 2015 |
| Gaelic Ltd | Colindale | 2021 |
| Gaelic Slate Ltd | Colindale | 2021 |
| Gaffney Industrial & Welding Supplies Ltd | Woking | 1997 |
| GAG House Comedy Clubs Limited | Guildford | 2024 |