| GOT2SOCIAL Ltd | Professional & scientific | 2025 |
| Gotboost Ltd | Wholesale & retail | 2014 |
| Govan Construction & Engineering Consultants Ltd | Construction | 2021 |
| Gower Holiday Village Limited | Arts & recreation | 2003 |
| GP Finance Services Limited | Professional & scientific | 2023 |
| GP Upvc Limited | Construction | 2015 |
| Gpfi Limited | Professional & scientific | 2015 |
| GPT Environmental Management Services Ltd | Water & waste | 2017 |
| GPT Recovery Systems Ltd | Manufacturing | 2019 |
| GR Hygiene Ltd | Administrative & support | 2026 |
| Grabbi Limited | Wholesale & retail | 2025 |
| Grace Goodwin Ltd | Real estate | 2022 |
| Grace Marketing Ltd | Wholesale & retail | 2019 |
| Gracie Bethan Jones Limited | Extraterritorial | 2024 |
| Grads Property Limited | Real estate | 2017 |
| Grafton Medical Services Ltd | Health & social care | 2015 |
| Graham Associates (International) Limited | Professional & scientific | 2001 |
| Graham Paul Limited | Professional & scientific | 1988 |
| Graham William Crumb Limited | Extraterritorial | 2023 |
| Grahame Guilford and Company Limited | Professional & scientific | 2007 |
| Granteve Limited | Extraterritorial | 2025 |
| Grantmire Limited | Extraterritorial | 2018 |
| Grassplan Landscapes Ltd | Administrative & support | 2022 |
| Grayson Enterprises Limited | Public administration | 1976 |
| Great Form Limited | Hospitality | 2023 |
| Great Scott Culinary Events Ltd | Hospitality | 2025 |
| Greater Resources Limited | Administrative & support | 2013 |
| Greedy Fella Limited | Hospitality | 2007 |
| Greek Grub Guys Ltd | Hospitality | 2022 |
| Green Farm Corporation Ltd | Agriculture & fishing | 2023 |
| Green Meadow Home Improvements Ltd | Construction | 2026 |
| Green Sustain UK Ltd | Professional & scientific | 2018 |
| Greenline Construction Limited | Real estate | 1984 |
| Greenspace SOS CIC | Administrative & support | 2023 |
| Greensport Trading Limited | Administrative & support | 2012 |
| Greenwood Engineering Limited | Manufacturing | 2015 |
| Gridfell Limited | Extraterritorial | 2025 |
| Gridward Limited | Extraterritorial | 2026 |
| Gridwest Limited | Extraterritorial | 2026 |
| Griff Group Ltd | Hospitality | 2019 |
| Griffiths Associates Limited | Information & communication | 1987 |
| Griffiths Logistics Bridgend Limited | Transport & logistics | 2022 |
| Groesfaen Property Solutions Limited | Households | 2014 |
| Groom & Llewellyn Limited | Professional & scientific | 1948 |
| Group Guys Ltd | Hospitality | 2022 |
| Groupbond Nominees Limited | Professional & scientific | 1968 |
| Grove J&N Limited | Professional & scientific | 2025 |
| Grovedon Limited | Hospitality | 2024 |
| Groveley Limited | Wholesale & retail | 2024 |
| Groveman Limited | Extraterritorial | 2026 |
| Grovemed Limited | Extraterritorial | 2025 |
| Groveray Limited | Wholesale & retail | 2025 |
| Growfromit UK Ltd | Wholesale & retail | 2025 |
| Growseed Ltd | Wholesale & retail | 2021 |
| Grŵp Trydan Gwyrdd Ltd | Professional & scientific | 2023 |
| GS Lighting Ltd | Information & communication | 2011 |
| Gsbennett Ltd | Wholesale & retail | 2022 |
| GSH Sales Services Limited | Professional & scientific | 2015 |
| GSK Consultancy Services Ltd | Professional & scientific | 2025 |
| GSR Construction Ltd | Construction | 2025 |
| GTD Sports & Physiotherapy Ltd | Health & social care | 2026 |
| Gtek Hydraulic Service Centre Limited | Manufacturing | 2006 |
| Guardian GAS (Europe) Limited | Professional & scientific | 2005 |
| Guardian GAS (GB) Ltd | Manufacturing | 2004 |
| Guardian GAS (London) Limited | Professional & scientific | 2005 |
| Guardian GAS (Wales) Ltd | Extraterritorial | 2008 |
| Guardian GAS Cylinders (Wales) Limited | Professional & scientific | 2004 |
| Guardian Trading Limited | Financial services | 2018 |
| GUM Sped Ltd | Transport & logistics | 2020 |
| Gummine Supplements Ltd | Wholesale & retail | 2025 |
| GW Petroleum Ltd | Wholesale & retail | 2012 |
| Gwalia Bakery Limited | Manufacturing | 2024 |
| Gwjr Properties Ltd | Real estate | 2025 |
| GWM Technical Ltd | Manufacturing | 2014 |
| Gwydra Events Limited | Arts & recreation | 2025 |
| Gynaecare Limited | Health & social care | 2022 |
| H L Mole Properties Ltd | Real estate | 2021 |
| H&E Motors Limited | Wholesale & retail | 2021 |
| H&H Brothers Properties Ltd | Real estate | 2026 |
| H&H Heating Limited | Construction | 2025 |
| H&M Gardening Services Limited | Other services | 2020 |
| H&S PVT. Limited | Transport & logistics | 2026 |
| H.S Carpentry & Building Ltd | Construction | 2017 |
| H2 World Ltd | Energy | 2016 |
| Haberfield Elite Property Ltd | Real estate | 2020 |
| Haberfield Homes Limited | Real estate | 2021 |
| Haberfield Property Ltd | Real estate | 2019 |
| Habershon Properties Limited | Real estate | 2022 |
| Hadenash Limited | Information & communication | 2021 |
| Hadenlea Limited | Extraterritorial | 2025 |
| Hair@Yours Ltd | Other services | 2020 |
| Halearch Limited | Extraterritorial | 2024 |
| Halemark Limited | Extraterritorial | 2026 |
| Hales Engineering Ltd | Construction | 2021 |
| Hall Astute Planning Limited | Financial services | 2013 |
| Hall Bricklaying Ltd | Construction | 2023 |
| Hampshire Access Limited | Construction | 2010 |
| Hanaesthetics Ltd | Health & social care | 2022 |
| Handicombe Limited | Real estate | 1992 |
| Handmade Welsh Candle Limited | Manufacturing | 2015 |