| G & T Homestead Limited | Wholesale & retail | 2025 |
| G Adams Consultancy Ltd | Financial services | 2011 |
| G and V Blanthorn Court Limited | Households | 2017 |
| G B Finance Facilities Limited | Financial services | 2017 |
| G Brothers Food Ltd | Wholesale & retail | 2022 |
| G C Insulation Supplies Ltd | Wholesale & retail | 2008 |
| G C Partnership Ltd | Wholesale & retail | 2021 |
| G Capital Limited | Real estate | 1994 |
| G Creative Property Solutions Limited | Construction | 2023 |
| G Door Ltd | Administrative & support | 2023 |
| G E Ceilings and Partitions Ltd | Construction | 2019 |
| G E Ramsey (Chadwick) Limited | Real estate | 2020 |
| G Estates Limited | Real estate | 2021 |
| G Glory Barber Ltd | Other services | 2026 |
| G Harvest Limited | Real estate | 2023 |
| G Hewer Limited | Construction | 2017 |
| G Hub Limited | Information & communication | 2025 |
| G Johnson Health Care Limited | Public administration | 2013 |
| G K Air Ltd | Construction | 2012 |
| G K P Electrics Ltd | Other services | 2017 |
| G L Williams Surgical Limited | Health & social care | 2026 |
| G M F Property Investments Limited | Real estate | 2022 |
| G P B Catering Services Limited | Manufacturing | 2022 |
| G P T Realisations Limited | | 1945 |
| G Picton Financial Services Limited | Other services | 2003 |
| G Prestige Performance Ltd | Wholesale & retail | 2025 |
| G Property Asset Management Limited | Real estate | 1998 |
| G Property Holdings Limited | Real estate | 2006 |
| G R & R G Finishers Limited | Construction | 1994 |
| G R Computer Management Limited | Information & communication | 1997 |
| G R Fisher Restoration Limited | Extraterritorial | 2011 |
| G Real Estate Limited | Real estate | 1994 |
| G Rees Heating (Wales) Ltd | Construction | 2020 |
| G Rose Marine Ltd | Manufacturing | 2024 |
| G Rowe Services Limited | Health & social care | 2007 |
| G S Bhogal Limited | Wholesale & retail | 2020 |
| G Securities Limited | Real estate | 1989 |
| G Shields Services Limited | Other services | 2025 |
| G Square Techsystems Limited | Professional & scientific | 2025 |
| G T Aspros & Company Limited | Professional & scientific | 2013 |
| G TAN Studio Limited | Other services | 2011 |
| G Technology Ltd | Wholesale & retail | 2025 |
| G the Bedford Inn Limited | Hospitality | 2019 |
| G Tivda Tranport Ltd | Transport & logistics | 2018 |
| G W E Davies Limited | Health & social care | 2022 |
| G W Hall & SON Ltd | Wholesale & retail | 2014 |
| G W Hall & SON Used Car Centre Ltd | Wholesale & retail | 2020 |
| G W Hall Ltd | Wholesale & retail | 2014 |
| G W Richards & Sons Contractors Limited | Construction | 2006 |
| G W Richards & Sons Developments Limited | Construction | 2013 |
| G W Richards & Sons Taverns Limited | Hospitality | 2014 |
| G Wooton-Slack Limited | Professional & scientific | 2007 |
| G&B Safe Delivery Ltd | Transport & logistics | 2025 |
| G&D Company Trans Ltd | Transport & logistics | 2016 |
| G&G Advisors Limited | Administrative & support | 2017 |
| G&G Developments SW Ltd | Construction | 2025 |
| G&G Verniciatura 1979 Ltd | Administrative & support | 2020 |
| G&M Barbers Limited | Other services | 2023 |
| G&S Interior Systems Ltd | Construction | 2026 |
| G&Se Ltd | Extraterritorial | 2015 |
| G&T Properties Cardiff Limited | Real estate | 2019 |
| G-Mart International Limited | Professional & scientific | 2009 |
| G-Ousvex Ltd | Wholesale & retail | 2025 |
| G. Howell Limited | Real estate | 2017 |
| G.A. Parks and Associates Ltd | Construction | 2006 |
| G.A.A.L Developments Limited | Construction | 2019 |
| G.A.S.Medical Care Concept Ltd | Health & social care | 2019 |
| G.A.S.S. (Cheltenham) Limited | Construction | 2008 |
| G.B Elite Plumbing & Heating Ltd | Construction | 2019 |
| G.E. Smart (Holdings) Limited | Financial services | 2021 |
| G.E. Turner Hydraulics | | 1968 |
| G.E.K Steel Works Ltd | Construction | 2019 |
| G.F.C. Agricultural Engineering Ltd | Manufacturing | 2019 |
| G.H.S Traders Newport Limited | Wholesale & retail | 2016 |
| G.I Events Group Limited | Arts & recreation | 2020 |
| G.M.G. Heating Company Limited | Wholesale & retail | 1968 |
| G.P. Caterers Limited | Hospitality | 1977 |
| G.P.K Immobiliare Ltd | Real estate | 2015 |
| G.Phillips Building Contractors Ltd | Construction | 2018 |
| G.T. Jones Contracting Limited | Agriculture & fishing | 2003 |
| G.T.S. (Fabrications) Limited | Manufacturing | 1973 |
| G.W Recovery & Transport Limited | Wholesale & retail | 2024 |
| G.W.D.F. CIC | Administrative & support | 2026 |
| G.Walters (Consultancy) Limited | Professional & scientific | 1998 |
| G2G Building Limited | Construction | 2014 |
| G39 | Arts & recreation | 2000 |
| G8 Property Limited | Real estate | 2021 |
| G9 Detailing Ltd | Administrative & support | 2026 |
| G9 Systems Limited | Construction | 2024 |
| GA & MB Properties Limited | Real estate | 2019 |
| GA Estates Enterprise Limited | Real estate | 2023 |
| GAA Group Limited | Construction | 2019 |
| Gaba Properties Limited | Real estate | 2002 |
| Gabani Resolve Ltd | Construction | 2023 |
| Gabbidon Property Management UK Ltd | Real estate | 2007 |
| Gabe Electrical Ltd | Construction | 2014 |
| Gabe Electrical South Wales Ltd | Construction | 2026 |
| Gabiausra Ltd | Wholesale & retail | 2022 |
| Gabimeno Ltd | Wholesale & retail | 2025 |
| Gable 15 Limited | Hospitality | 2019 |