| Granite Logic Ltd | Information & communication | 2025 |
| Graniteoak Limited | Information & communication | 2017 |
| Granny Mac's Irish Cafe Bar Limited | Hospitality | 2026 |
| Grant Aero Limited | Manufacturing | 2017 |
| Grant Construction Services Limited | Construction | 2019 |
| Grant Johns Ltd | Construction | 2017 |
| Grant Sheep Limited | Wholesale & retail | 2024 |
| Grant Sinclair Design Ltd | Manufacturing | 2012 |
| Grant Sinclair Futurist Limited | Manufacturing | 2018 |
| Grant Stephens Family Law Ltd | Professional & scientific | 2013 |
| Grant Stewart Services Ltd | Construction | 2025 |
| Grant Thompson Ltd | Wholesale & retail | 2013 |
| Grant Wenham Ltd | Construction | 2019 |
| Grantaction Limited | | 1987 |
| Granturismo Automotive Products Co., Limited | Extraterritorial | 2017 |
| Grape and Grain Management Limited | Hospitality | 2012 |
| Grape Global Limited | Wholesale & retail | 2016 |
| Grapevine Event Management Ltd | Administrative & support | 2012 |
| Grapevine Marketing Ltd | Professional & scientific | 2024 |
| Graph 3D Ltd | Administrative & support | 2021 |
| Graphene Networks Ltd | Information & communication | 2018 |
| Graphic&It Solutions Ltd | Information & communication | 2025 |
| Graphics Direct London Ltd | Information & communication | 2020 |
| Grasp the Nettle CYF | Other services | 2025 |
| Grass Track Investments Limited | Real estate | 2016 |
| Grasshopper Communications Ltd | Professional & scientific | 2015 |
| Grassroots (Cardiff) Limited | Health & social care | 2004 |
| Grassroots Publications Ltd | Information & communication | 2021 |
| Grasuccess Limited | Wholesale & retail | 2022 |
| Grateful Property Finance Ltd | Financial services | 2025 |
| Grath Ltd. | Hospitality | 2002 |
| Gratitude Investments Ltd | Other services | 2019 |
| Gratwood Ltd | Wholesale & retail | 2025 |
| Graveley Food & Beverage Ltd | Hospitality | 2019 |
| Gravells Llangennech Limited | Wholesale & retail | 2019 |
| Gravelye Engineering Associates Limited | Professional & scientific | 1985 |
| Gravida Collective Ltd | Arts & recreation | 2021 |
| Gravit-E Centric Limited | Information & communication | 2012 |
| Gravitas Alliance Limited | Hospitality | 2009 |
| Gravity Gains Performance Ltd | Wholesale & retail | 2025 |
| Gravity-Travel Ltd | Administrative & support | 2025 |
| Gravitywisp Creations Ltd | Wholesale & retail | 2025 |
| Gray .S.G Ltd | Construction | 2026 |
| Gray Cloud Limited | Construction | 2018 |
| Gray Dunn & Co. Limited | Manufacturing | 1993 |
| Gray Nutrition Ltd | Wholesale & retail | 2025 |
| Gray Scrubs AI Ltd | Information & communication | 2025 |
| Graydon UK Limited | Administrative & support | 1940 |
| Grayhouse Productions Limited | Arts & recreation | 2022 |
| Grayhouse Stories Limited | Arts & recreation | 2022 |
| Graymattrs Ltd | Health & social care | 2021 |
| Graymyley Properties Ltd | Real estate | 2024 |
| Graynitex Limited | Wholesale & retail | 2025 |
| Grays Techno Ltd | Wholesale & retail | 2025 |
| Graysons Lifestyle Ltd | Wholesale & retail | 2020 |
| Grayton Engineering Limited | Manufacturing | 1992 |
| Graywood Services Ltd | Information & communication | 2024 |
| Graze Kitchen Company CDF Ltd | Hospitality | 2023 |
| Grazed Brownies Limited | Manufacturing | 2022 |
| GRC Plumbing and Heating (Cardiff) Ltd | Construction | 2024 |
| GRD 1982 Limited | Professional & scientific | 2022 |
| GRD Accounting & Business Services Ltd | Professional & scientific | 2023 |
| Grease Monkeys Cardiff Ltd | Manufacturing | 2016 |
| Greasy Nuts Garage Ltd | Wholesale & retail | 2025 |
| Great Assets PC | | 2017 |
| Great Bear Healthcare Group Limited | Financial services | 2020 |
| Great Bear Media Limited | Information & communication | 2018 |
| Great Britain Diving Federation C.I.C. | Arts & recreation | 2025 |
| Great Eastern Finance Company Limited | Other services | 1963 |
| Great Fold Developments Limited | Construction | 2019 |
| Great Food Burgers Ltd | Hospitality | 2025 |
| Great Free Life Limited | Wholesale & retail | 2021 |
| Great Grace Care Limited | Health & social care | 2015 |
| Great Haian Limited | Wholesale & retail | 2020 |
| Great Hamston Holdings Limited | Professional & scientific | 2021 |
| Great House Farm Community Limited | Other services | 2013 |
| Great House Farm Community Phase II Limited | Households | 2017 |
| Great House Farm Community Phase III Limited | Households | 2018 |
| Great House Farm Stores Limited | Wholesale & retail | 2021 |
| Great International Business Service Limited | Financial services | 2021 |
| Great Lady Technology Co., Ltd | Wholesale & retail | 2022 |
| Great LEE Limited | Wholesale & retail | 2023 |
| Great Markets Ltd | Wholesale & retail | 2018 |
| Great Pettits Court Management Company Limited | Real estate | 1997 |
| Great Point Production Services Limited | Information & communication | 2023 |
| Great Point Studios Limited | Information & communication | 2017 |
| Great Sea Chixiang Ltd | Wholesale & retail | 2025 |
| Great Sigma Ltd | Wholesale & retail | 2020 |
| Great Talent International Limited | Professional & scientific | 2013 |
| Great Tea Street Limited | Wholesale & retail | 2019 |
| Great Welsh Gifts Ltd | Wholesale & retail | 2019 |
| Great Welsh Gifts Shop Ltd | Wholesale & retail | 2019 |
| Great Western Estates Limited | Real estate | 2005 |
| Great Winchester Asset Management Ltd | Information & communication | 2016 |
| Greater Manchester GAS Heating and Plumbing Ltd | Construction | 2019 |
| Greater Works Building Services Ltd | Construction | 2017 |
| Greatlantor Ltd | Professional & scientific | 2023 |
| Greaves Civil Engineering Limited | Construction | 2019 |
| Greazy Vegan Cardiff Limited | Hospitality | 2019 |
| Grech Gooden Cormack Solicitors Ltd | Professional & scientific | 2012 |